The roller cone bit breaks rock by crushing and shearing. The cone is rolling at the bottom of the well, so the requirement for the torque is small, which can greatly reduce the mechanical load.
When the drill bit is working, the roller cone not only rotates around the axis of the drill string but also rotates around its own axis.
According to the number of roller cones, roller cone bits can be divided into single roller cones, double roller cones, three roller cones, four roller cones and multiple roller cones. According to the method of breaking rock, it can be divided into full-scale drilling cone bit and coring cone bit. According to the nature of the work, it can be divided into forward pilot hole drilling positive circulation roller cone bit, a pilot hole drilling reverse circulation roller cone bit, center continuous sampling cone roller bit, positive circulation reaming roller cone bit, and reverse circulation reaming roller cone bit. According to the teeth and structure of roller cones, it can be divided into steel teeth and embedded roller cone bits. When using it, it is necessary to choose the adaptation range of its tooth shape according to the local conditions.
The roller cone bit is used for drilling and has a wide range of applications, and it can be applied from soft formations to hard bedrock formations.
Used in the water well, and the geothermal well
In contracted water well drilling projects, the adoption of roller cone drilling accounts for more than 80%, especially in the deepwater wells and the geothermal well construction. A small number of traditional fishtail drill holes, three-blade drill bit reaming, and hard alloy steel core drilling, which is not only laborious but also lavish, causing great waste to the construction and increasing the burden. Now, there is no choice but to seek for the innovation and upgrade of the roller cone drilling.
Used in the gas mining
Safety accidents occur frequently in coal production. CBM wells are generally drilled with roller cone bits in the first opening, and pneumatically by DTH hammers in the second opening. Due to the large diameter of the gas discharge well and there are certain requirements about the verticality of the hole. Therefore, the three roller bits are generally used to drill the front pilot holes, and then the roller cone drills are expanded to form the well.
Used in the trenchless project
In the construction of trenchless crossing project, in addition to using winged carbide back-expanding drill bits in loose formations, some bedrock formations also need to use roller cone welding back-expanding drill bits to complete the task. It mainly uses roller cone reamer and PDC reamer.
Used in the foundation construction with large diameter pile
In the construction of building and bridge foundation engineering, rock-socket piles with large diameter and high bearing capacity are often required. The previous method is to use cemented carbide and steel grain drilling, but now, the traditional drilling process has been replaced by the roller cone drilling process, which is of simple operation and strong adaptability. It can realize non-circulation drilling, mud forward circulation drilling, reverse circulation drilling and bottom expansion pile drilling. The main tool is a barrel drill. If it are co-used with a replaceable tooth palm piece, the rock will be broken evenly, with high efficiency, low cost, and the quality of the drilled hole will be better.
Great Drill Bits is a professional rock drill bit suppliers, we provide drill bit supply such as high strength drill bits, clay bit, great drill bits and etc. Want to know the rock drill bits price or more? Please contact us.
The company’s newly arrived equipment imported from Taiwan. In order to increase production, we can provide customers with faster and better delivery。
We provide the drillbits from 3″ to 26″, HDD Hole opener from 8”- 48”, Such as PDC bit, Cone cutter, Tricone bit, PDC Coring bit, Bi-center series, Reaming tool, Hole opener, etc.
And can be customized according to customer demand.
For more information about our products and services please contact us.
2020, looking forward to your continuous attention.
The main parameters of rock reamer operation control are the thrust force exerted by the drill on the reamer (force in reverse reaming and thrust in forward reaming) or the bit pressure, rotating speed and mud pumping volume during reaming.
Its control points are as follows:
(1) Different diameters and different forms of rock reamer have different requirements on bit pressure. Most rock layer reamer accidents are caused by excessive pursuit of pore broadening speed and excessive bit pressure applied.
(2) Speed is another important control parameter for rock reaming construction. The speed here refers to the speed driven by drill pipe and reamer, and the adjustment of speed is mainly related to the hardness of rock.
When the diameter of the reamer is more than 700mm, the recommended speed should not exceed 40Rpm. When drilling in hard rock, the speed should be reduced correspondingly, generally ranging from 10 to 40Rpm.
Too fast speed will cause abnormal wear of the reamer and even cause an accident of reaming.
(3) rock broaching operation should follow one of the most important principles:the harder the rock to be broken, the greater the need of wob and the lower the requirements of the drilling rate. At the same time, what should be paid attention to is that under the condition of the same rig drilling rate, the effect of the different diameter of reamer is not the same, the greater the outside edge of the linear velocity, the more serious the wear also.
As a professional HDD Toolings manufacturer, our mainly products are:pilot bit, roller reamer(rock reamers, HDD hole opener), roller cone cutters .
(4) It is also critical to ensure the amount of mud pumped during rock layer reaming, where the main role of the mud is to cool the reamer and carry cuttings. The actual pumping amount of mud should be calculated based on the amount of cuttings produced by each stage of reaming and the carrying capacity of the mud, generally no less than 1m/min.
(5) The reamer into rock construction methods: when the rock reamer into from soft soil layers or from soft rock into hard rock, the operating point is first expanding speed slow down, reducing wob, staying reamer ontology completely into the rock and hard rock strata and then increasing the wob. Exerting wob is too large, if the process is likely to cause sticking, so as to damage the reamer, or at least reduce the life span of the reamer bearing.
In the process of graded reaming, pay attention not to choose rock reamer with too similar diameter (class difference less than 50mm) for graded reaming, otherwise, it will not give full play to the reamer’s due reaming effect. On the other hand, a reamer with too similar diameter will easily be stuck by the rock layer during operation.
Great Drill Bits is a professional drill bit factory, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig.
The reaming design includes reaming classification, reaming type selection, reaming drilling assembly, cleaning drilling assembly, bit pressure, torque, speed and mud flow rate, etc.
The classification of reaming mainly depends on the formation property, final hole diameter, drilling length, drilling capacity, mud pump capacity, drill pipe size and reaming type.
The choice of reamer mainly depends on the physical and mechanical properties of the strata.
At present, there are two types of reamer.One is suitable for general soil layer (soft reamers) and the other one for rock stratum in common use (Rock reamers/HDD rock reamers). Each type of reamer has a variety of structural shapes.
Among them, the reamer suitable for soil layer has common structural forms such as barrel reamer, fluted reamer,cutter reamer, step type reamer. And rock reamer has two common structural forms, namely roller cone cutter type and hob type.
The diameter of the final hole of the horizontal directional drilling pipeline crossing project is generally 1.2 ~ 1.5 times of the outer diameter of the pipeline, and the design diameter is generally reached by means of graded reaming. The number of grades mainly depends on the nature of the formation, equipment capacity and the selected drill pipe specification.
Large equipment capacity and high drill pipe strength reduce the number of grading according to the formation conditions to speed up the construction schedule.
The nozzle of the reamer is the outlet of the mud. Once it is blocked, it will cause the rise of ground pump pressure or the phenomenon of no mud, which is not conducive to the drilling of the reamer.
Abnormal torque and tension during reaming may be related to formation, cuttings accumulation, borehole collapse, interrupted mud circulation, excessive wear of reamer, etc.
In case of abnormality, it is an effective way to analyze and judge the condition in the hole.
After the completion of the first stage of reaming, if the torque is too large in the whole process of reaming, it may be caused by excessive drilling cuttings content in the hole. Before entering the next stage of reaming, a thorough cleaning is very beneficial to reduce the pressure of the next stage of reaming.
Please feel free to contact us if you have any other questions about rock reamers, HDD reamers, hole openers.
In oil drilling and geological drilling, the cone drill bit is the most widely used. When the bit rotates, it can impact, crush and shear the stratum rock. Therefore, cone drill bit can adapt to soft, medium and hard strata. Especially after the emergence of jet type cone drill bit and long nozzle cone drill bit, the drilling speed of the bit has been greatly improved, which is a major revolution in the development history of the bit.
According to the type of teeth, cone drill bit can be divided into milling (steel teeth) cone drill bits and insert (carbide teeth inlaid on the cone) cone drill bits. According to the number of cone, it can be divided into single cone drill bit, tricone drill bit and assembled multi cone drill bit. The tricone drill bit is the most widely and commonly used. The cone suppliers shall pay attention to whether the quality inspection is qualified when selling the cone drill bit.
Tricone drill bit is an important tool in oil drilling. Its performance will directly affect the quality, efficiency and cost of drilling. The effective way to reduce drilling cost is to increase the mechanical drilling speed and service life of bit. It has been proved by some data that the improvement of drilling rate has more influence on reducing drilling cost than the improvement of bit service life. The improvement of bit cutting structure is the most direct way to improve the mechanical drilling rate.
For a long time, the improvement of the cutting structure has focused on the main cutting tooth structure. For example, in the structure of cemented carbide teeth, people have invented wedge teeth, spoon-shaped teeth, partial top spoon-shaped teeth and equal wear tooth, etc. It is gradually recognized that the diameter maintaining structure also has a great impact on the bit mechanical drilling speed and service life. In particular, the bit used in highly deviated wells and horizontal wells requires a reasonable diameter maintaining structure. Many new types of diameter maintaining structures have been developed and applied to cone drill bits with good results.
Cangzhou Great Drill Bits Co.,Ltd. has roller cone bits for sale, and out quality and service is trustworthy. Welcome to know more about us and purchase our products.
Our brand is GREAT, founded in 2010, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig. Up to now, we have to be the top drill bit factory of CNPC, SINOPEC, CNOOC. We have a 40,000 m² of production based in Hejian provincial development zone, Hebei, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance diamond processing, with the annual production capacity of more than 10,000 pcs. We provide the drill bits from 3″ to 36″, Rock reamer from 8”- 72”, Such as PDC bit, Tricone bit, Roller bit, Diamond Core bit, Bi-center bit, PDC reamer, Hole opener, etc.。
We, Cangzhou Great Drill Bits Co. Ltd., specialized in R&D, design, production, and sales various drill bits. The drill bits size from 3″ to 26″ , HDD Hole opener from 8“- 48“ , Such as PDC bit, Roller bit, Tricone bit, PDC Coring bit, Bi-center bits, Hole opener, etc. The Company consistently adheres to the concept of industrial development to promote energy development, adhered to innovative drive, scientific development, and is one of the largest scale companies in Asia for PDC bit and Tricone bit, Hole opener manufacturer.
Our PDC bit production line includes Matrix body PDC bit and Steel body PDC bit. Tricone bit is mainly Three cone bits, and according to the drilling formation different, we have TCI bit and Steel tooth bit available. In some HDD(Horizontal directional drilling ) project, we have Rock reamers for hard formation. Our Roller bit core barrel is widely used for piling foundation too.
PDC bit is the abbreviation of Polycrystalline diamond compact bit, also known as Polycrystalline diamond cutting block bit or composite chip bit. Because of its advantages of fast drilling speed, long service life and high footage PDC bit is widely used in oil drilling.
1. Structure characteristics of PDC bit
PDC bit is composed of bit body, PDC cutting teeth and nozzle. According to different structure and manufacturing process, PDC bit is divided into two series: steel body and matrix body.
The whole bit body of rigid PDC bit is made of medium carbon steel and formed by machine manufacturing process. Drill holes on the working face of the bit, and fix PDC cutting teeth on the bit crown by pressing in and tight fitting. The crown of a drill bit is treated by surface hardening process (spraying tungsten carbide wear-resistant layer, carburizing, etc.) to enhance its erosion resistance. The main advantage of this kind of bit is simple manufacturing process, but the disadvantage is that the bit body is not erosion resistant and the cutting teeth are difficult to be fixed, so it is seldom used at present.
The upper part of PDC bit is made of steel and the lower part is made of WC wear-resistant alloy. The PDC bit is made by powder metallurgy sintering process. The PDC cutting teeth are welded on the preformed groove of the carcass with low-temperature solder. Tungsten carbide matrix has high hardness and erosion resistance, so the matrix PDC bit has long service life and high footage, which is widely used at present.
2. Working principle of PDC bit
PDC bit breaks rocks by cutting. The self-sharpening cutting teeth can easily cut into the formation under the action of WOB and move the shear rock forward under the action of torque. Many PDC cutting teeth work at the same time, there are many free faces of the bottom rock, and the rock is easy to be broken under the shear action, so the rock breaking efficiency is high and the drilling speed is fast.
3. Correct use of PDC bit
PDC bit has the best effect in large homogeneous soft to medium-hard formation. It is not suitable for drilling gravel layer and soft hard cross formation.
Drilling with low WOB, high rotation speed and large displacement has a good effect.
Before the bit is put into the well, the bottom of the well shall be clean to ensure no metal falling.
When the bit is just put into the well, it should adopt small bit pressure and low rotation speed to run and resume normal drilling after the bottom of the well is formed.
PDC bit is an integral bit, without any moving parts, suitable for high-speed turbo drilling.
Our brand is GREAT, founded in 2010, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig. Up to now, we have to be the top drill bit manufacturers in china of CNPC, SINOPEC, CNOOC. We have a 40,000 m² of production based in Hejian provincial development zone, Hebei, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance diamond processing, with the annual production capacity of more than 10,000 pcs. We provide the drill bits from 3″ to 36″, Rock reamer from 8”- 72”, Such as PDC bit, Tricone bit, Roller bit, Diamond Core bit, Bi-center bit, PDC reamer, Hole opener, etc.。If you need to buy drill bits for rock and concrete,please contact us.
We, Cangzhou Great Drill Bits Co. Ltd., specialized in R&D, design, production, and sales various drill bits. The Great Drill Bits size from 3″ to 26″ , HDD Hole opener from 8“- 48“ , Such as PDC bit, Roller bit, Tricone bit, PDC Coring bit, Bi-center bits, Hole opener, etc. The Company consistently adheres to the concept of industrial development to promote energy development, adhered to innovative drive, scientific development, and is one of the largest scale companies in Asia for PDC bit and Tricone bit, Hole opener manufacturer.
Our PDC bit production line includes Matrix body PDC bit and Steel body PDC bit. Tricone bit is mainly Three cone bits, and according to the drilling formation different, we have TCI bit and Steel tooth bit available. In some HDD(Horizontal directional drilling ) project, we have Rock reamers for hard formation. Our Roller bit core barrel is widely used for piling foundation too.
Drilling work is a complex and diversified system engineering. In order to ensure the successful completion, coordination and cooperation of multiple systems are needed, among which the reasonable selection of bit is the prerequisite to ensure the high quality and efficient completion of drilling work. Nowadays, the most widely used bits in drilling engineering are roller bits and diamond composite bits (PDC). This paper analyzes the application of roller bits and PDC bits in drilling engineering.
1. Definition of roller bit and PDC
1.1 The roller bit is the most widely used drilling bit. When the bit is working, the cutting teeth alternately contact the bottom of the well, the rock breaking torque is small, the contact area between the cutting teeth and the bottom of the well is small, the specific pressure is high, and it is easy to dig into the formation; the total length of the working edge is large, so the wear is relatively reduced. The cone bit can adapt to a variety of strata from soft to hard. According to the number of cone, it can be divided into single cone bit, three cone bit and assembled multi cone bit. According to the cutting material, it can be divided into steel teeth (milling teeth) and inserted teeth cone bit.
1.2 PDC bit is a polycrystalline diamond composite chip drill, and refers to the abbreviation of the head. The shape of the composite chip is a circular cutting tool which is inlaid and welded on the cylinder, and the cutting tool is inlaid on the drill body to become a PDC drill. PDC bit is much cheaper than natural diamond bit, but it is only suitable for soft to medium hard formation. PDC bit developed rapidly after it was manufactured and used successfully in the early 1970s. It can be used with low WOB and high rotation speed, high bit footage and low unit footage cost. In some oilfields of China, diamond polycrystalline composite chips are used for inlaying and welding on scraper, and great effects are obtained.
At present, PDC bits are designed with cutting wings. With the increase of the number of cutting wings, the impact load acting on the cutting teeth decreases, the controllability of the bit increases, and the life of the bit extends. On the contrary, with the decrease of the number of cutting wings, the drilling performance of the bit improves, and the bit has a higher drilling speed. Generally speaking, the larger the formation strength is, the more the number of cutting teeth is, and the more the number of cutting wings is in general. The number of PDC bit wings is no less than 3, but there are few more than 10.
2. Comparative analysis of rock breaking mechanism between roller bit and PDC bit
2.1 The mechanism of rock breaking by roller bit. Under the action of bit pressure and drill string rotation, the teeth crush and dig into the rock, and at the same time produce certain sliding and shearing rock. When the cone rolls at the bottom of the well, the teeth on the cone successively impact and press into the formation. This effect can crush part of the bottom rock, and cut off the remaining part of the rock between teeth by the shear effect brought by the roller sliding, so that the bottom rock is completely broken and the well can be extended.
2.2 Rock breaking mechanism of PDC bit. The working principle of PDC bit is basically the same as that of scraper bit.
(1) When PDC bit is drilling into some hard formation, it presses the rock under the action of WOB, which makes the rock in contact with diamond in a very high stress state and makes the rock appear plasticity.
(2) In the plastic (or rock is plastic under stress) formation, diamond digs into the formation and causes the front rock to break or plastic flow under the action of bit torque, which separates from the rock matrix and forms rock debris.
(3) In the rock with high brittleness, the stress produced under the action of WOB and torque makes the rock show brittle fracture, that is to say, the rock is destroyed by shear and tension. In this case, the rock breaking speed of diamond bit is higher, and the volume of rock breaking is much larger than that of displacement after diamond digging.
(4) In hard rock, due to the limitation of the strength of diamond itself, the bit pressure on the larger size diamond is not enough to cause the plastic deformation in the rock, so the diamond with fine particles is generally used to make impregnated diamond bit for drilling, which is characterized by micro cutting, carving and other ways to break the rock depending on the angle of diamond. The cuttings thus separated are basically fine-grained powder, and the working efficiency and service life of the bit are very low.
3. Applicable conditions of rotary rock drill bits and PDC bits
3.1 The application scope of rotary rock drill bit is the most widely used in petroleum drilling and geological drilling. The rotary rock drill bit has the effect of impacting, crushing, and shearing the formation rock when it rotates. Therefore, rotary rock drill bit can adapt to various formations, soft, medium, and hard. Especially after the emergence of jet cone roller bits and long nozzle cone roller bits. The drilling speed of roller cone bits is greatly increased. It is a major revolution in the development history of roller cone bits. According to the type of teeth, roller cone bits can be divided into milled teeth (steel teeth) roller cone bits and inserts (hard alloy tooth roller cone bits are installed on the roller cone; according to the number of roller cones, they can be divided into single rotary rock drill bit and tricone drill bit and assembled multi-cone bits. The tricone drill bits are the most widely used at home and abroad.
3.2 Application scope of PDC bit at present, often uses well section, oil-based mud, or water-based mud used in non reducing well section where bit needs to work for a long time at the bottom of the well. PDC bit also has advantages in high speed drilling tools, such as turbodrill, screw drill or deviation section.
PDC bit is often used in the formation with low compressive strength, poor cementation, low abrasiveness or thin interlayer, such as salt rock, gypsum rock, marl, limestone, etc., and the formation with medium compressive strength, certain abrasiveness and brittleness, such as sandstone, siliceous shale, porous carbonate rock and gypsum rock. But PDC bit is in high compressive strength, tight cementation like the abrasive sandstone, chert and granite, corundum, pyrite and grave, the effects are not good.
Many service companies and drilling contractors use rock compressive strength analysis software to determine the hardness of the formation. These computer analysis models of rock compressive strength use logging analysis technology to analyze and determine the triaxial compressive strength of the formation. Rock compressive strength analysis software can help the drilling contractor to determine the drillable well section of PDC bit, optimize bit selection and determine the optimal drilling parameters. The development and application of this software can promote the use of PDC bit.
4. Advantages and disadvantages of 4 cone bit and PDC bit
4.1 Advantages and disadvantages of roller bit
(1) The cone bit is suitable for various strata, so it is the most widely used bit.
(2) The rock cuttings produced by the broken rock of the cone bit are larger, which is helpful to distinguish the rock cuttings and judge the geological conditions more accurately.
(3) The service life of cone bit is not long enough and the footage is small, which increases the tripping times and affects the whole construction progress. Moreover, frequent tripping prolongs the immersion time of mud to oil and gas reservoir, causes serious damage to oil and gas reservoir and affects the exploitation of oil and gas.
(4) The core of cone bit can not be reused, which increases the drilling cost to a certain extent.
(5) Due to the limitation of its structural characteristics, the cone bit is easy to fall to the bottom of the well and cause downhole accidents.
4.2 Advantages and disadvantages of PDC bit
(1) PDC bit is suitable for high speed, high displacement and low WOB, so the requirement of equipment is relatively high.
PDC bit’s working principle is basically the same as scraper bit, so it generally requires lower WOB and higher rotation speed. The bit pressure of PDC bit is generally 20-40% of that of the same size bit when it is used on site.
(3) PDC bit is composed of bit matrix and diamond composite sheet. When cutting rock, the composite sheet mainly contacts with the rock. The matrix will not be damaged basically, so the matrix can be reused. To a certain extent, the drilling cost is saved.
(4) PDC bit is not well used in abrasive sandstone, chert and granite, corundum, pyrite and gravel with high compressive strength and tight cementation.
(5) When PDC bit is drilling, micro cutting is realized by the edge angle of diamond. To break rocks by carving, etc. The cuttings separated in this way are basically fine-grained powder. It is not easy to accurately judge the downhole situation when cuttings logging is used in the field.
(6) Because of some characteristics of PDC bit itself, it causes the problems of deviation and azimuth control in directional well, so it is often used in field directional well.
5. Development prospect of 5 cone bit and PDC bit
The advantages of roller bit and PDC bit are very obvious in the process of drilling. The roller PDC mixed bit came out and was used in the field drilling, and achieved remarkable results. With the development of science and technology, there will be more and more advanced bit structure and drilling technology.
Our brand is GREAT, founded in 2010, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig. Up to now, we have to be the top drill bit factory of CNPC, SINOPEC, CNOOC. We have a 40,000 m² of production based in Hejian provincial development zone, Hebei, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance diamond processing, with the annual production capacity of more than 10,000 pcs. We provide the drill bits from 3″ to 36″, Rock reamer from 8”- 72”, Such as PDC bit, Tricone bit, Roller bit, Diamond Core bit, Bi-center bit, PDC reamer, Hole opener, etc.。
We, Cangzhou Great Drill Bits Co. Ltd., specialized in R&D, design, production, and sales various drill bits. The Great Drill Bits size from 3″ to 26″ , HDD Hole opener from 8“- 48“ , Such as PDC bit, Roller bit, Tricone bit, PDC Coring bit, Bi-center bits, Hole opener, etc. The Company consistently adheres to the concept of industrial development to promote energy development, adhered to innovative drive, scientific development, and is one of the largest scale companies in Asia for PDC bit and Tricone bit, Hole opener manufacturer.
Our PDC bit production line includes Matrix body PDC bit and Steel body PDC bit. Tricone bit is mainly Three cone bits, and according to the drilling formation different, we have TCI bit and Steel tooth bit available. In some HDD(Horizontal directional drilling ) project, we have Rock reamers for hard formation. Our Roller bit core barrel is widely used for piling foundation too.
In the process of drilling, drill bit is the main tool to break rock, and borehole is formed by a drill bit breaking rock. The formation of a well is good or bad, and the length of time it takes is not only related to the rock characteristics of the drilled formation and the performance of the bit itself, but also related to the matching degree between the bit and the formation. The reasonable selection of bit plays an important role in improving the drilling speed and reducing the comprehensive cost of drilling.
The bit is one of the important tools for oil drilling. Whether the bit adapts to the rock property and its quality plays a very important role in the selection of drilling technology, especially in the aspects of drilling quality, drilling speed and drilling cost. PDC bit is a rock breaking tool widely used in the oil and gas exploration and development industry today which effectively improves the mechanical drilling tools and shortens the drilling cycle.
Bit is one of the main drilling equipment. According to the different working environment and regional environment, the specification and shape of bit should also be different. When drilling oil, the bit should be selected reasonably and scientifically based on the specific needs and design scheme.
At present, there are many kinds of bits used in the petroleum industry. According to different drilling methods, the bits can be classified into diamond bits, roller bits and scraper bits. These three kinds of bits are the most basic ones.
Because of the excellent cutting performance of diamond drill bits rock, the diamond bit can drill at high speed and enlarge the drilling depth to a certain extent when being selected as oil drilling tool. In the process of drilling oil with diamond bit, the following aspects need to be paid attention to:
First, the price of diamond bit is relatively high, so we should operate it carefully to reduce the damage degree;
Secondly, the diamond bit has some defects in thermal stability, so the cooling performance and cleaning condition of the bit should be guaranteed when it is used;
Thirdly, its texture is relatively brittle, so the impact resistance of the diamond bit will be relatively poor, so we should strictly follow the relevant rules of the diamond bit to carry out strict and standardized operation.
When selecting a bit as an oil drilling tool, it is necessary to select the bit according to the actual situation of the drilling equipment, the actual conditions of the formation, the geological data of the adjacent oil wells and the formation data. During the selection, the following issues need to be considered:
First of all, we need consider whether there is soft and hard interlacing in the drilling formation;
Secondly, it should consider whether anti deviation drilling and curve operation are needed in the oil drilling work;
Thirdly, the actual depth of different drilling sections in the same well should be considered;
Finally, drilling geology, formation abradability and hardness should be considered.
Our brand is GREAT, founded in 2010, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig. Up to now, we have to be the top drill bit manufacturers in china of CNPC, SINOPEC, CNOOC. We have a 40,000 m² of production based in Hejian provincial development zone, Hebei, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance diamond processing, with the annual production capacity of more than 10,000 pcs. We provide the drill bits from 3″ to 36″, Rock reamer from 8”- 72”, Such as PDC bit, Tricone bit, Roller bit, Diamond Core bit, Bi-center bit, PDC reamer, Hole opener, etc.。
We, Cangzhou Great Drill Bits Co. Ltd., specialized in R&D, design, production, and sales various drill bits. The Great Drill Bits size from 3″ to 26″ , HDD Hole opener from 8“- 48“ , Such as PDC bit, Roller bit, Tricone bit, PDC Coring bit, Bi-center bits, Hole opener, etc. The Company consistently adheres to the concept of industrial development to promote energy development, adhered to innovative drive, scientific development, and is one of the largest scale companies in Asia for PDC bit and Tricone bit, Hole opener manufacturer.
Our PDC bit production line includes Matrix body PDC bit and Steel body PDC bit. Tricone bit is mainly Three cone bits, and according to the drilling formation different, we have TCI bit and Steel tooth bit available. In some HDD(Horizontal directional drilling ) project, we have Rock reamers for hard formation. Our Roller bit core barrel is widely used for piling foundation too.
Horizontal Directional Drilling(HDD for short) is a modern trenchless construction technology that combines the directional drilling technology of the petroleum industry with the traditional highway pipe jacking technology.
In recent years, with the improvement of scientific and technological level, the horizontal directional drilling rig and its supporting technical tools have been continuously improved and perfected, the performance of the whole machine has been greatly improved, and the horizontal directional drilling crossing technology has also been widely used, especially in urban municipal pipeline construction and oil and gas pipeline crossing river projects have more unique advantages. The reamer is an important part of the horizontal directional drill bit to complete its reaming operation during the construction process, which will be directly related to the success or failure of the pipe laying.
Reamer is a kind of power equipment used for reaming pipes during reaming operation, including roller cone reamer and PDC reamer. The main function of reamer is to cut and expand the guide hole along the curve of the guide hole. Tungsten carbide alloy teeth and nozzles are installed on the reamer, the former is mainly used for cutting and squeezing rock and soil layers, and the latter is mainly used for mud jet.
The horizontal directional drilling crossing technology principle: through the computer-controlled guidance and detection, a small-diameter pilot hole with the same design curve will be drilled first, and then a reamer will be installed on the head of the drill rod at the outlet end of the pilot hole to pull back and expand the hole to guide. After the hole is expanded to the size that required, the rotary joint, the tube head and the pipeline will be connected to the rear of the reamer, and drag the product pipeline back to the enlarged guide hole to complete the construction process of pipeline crossing. The hole expansion operation is one of the key technical links in the horizontal directional crossing construction, and the key to the hole expansion operation is to select an efficient and safe reamer according to the actual conditions.
During the working procession, the forward movement of the reamer needs to overcome the positive pressure resistance and friction resistance of the rock layer or soil body, and the rotary movement of the reamer needs to overcome the resistance torque of the rock layer or soil body to the tool and the friction torque on the surface of the reamer.
The optimization of the shape and size of the reamer has a great influence on the resistance and torsion torque during the working procession, which is directly related to the working efficiency of the horizontal directional drilling machine. It can be seen that the analysis and research on the selection of reamer and engineering application are of great significance for the smooth progress of horizontal directional drilling construction.
The enlargement of horizontal directional drilling through the rock layer should focus on the following three aspects: the service life of the reamer, the torque value generated by the reamer at each stage of reaming, the efficiency and economics of reaming. In addition, the reaming process also plays a certain role in correcting the guide hole. If the guide hole is only bent at a small angle, after selecting the appropriate reamer, the ideal smooth hole can be achieved through the reaming operation. For example, in a hard and uneven formation, the reamer tends to deflect to the soft formation, that is, to the direction of least resistance, and long-term use will cause damage to the reamer. In practice, flexible choices should be made according to the conditions of the rock formation, the ability to traverse the equipment, the diameter of the hole expansion, and the condition of the traversing mud.
Our brand is GREAT, founded in 2010, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig. Up to now, we have to be the top drill bit manufacturers in china of CNPC, SINOPEC, CNOOC. We have a 40,000 m² of production based in Hejian provincial development zone, Hebei, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance diamond processing, with the annual production capacity of more than 10,000 pcs. We provide the drill bits from 3″ to 36″, Rock reamer from 8”- 72”, Such as PDC bit, Tricone bit, Roller bit, Diamond Core bit, Bi-center bit, PDC reamer, Hole opener, etc.。If you need to buy drill bits for rock and concrete,please contact us.
We, Cangzhou Great Drill Bits Co. Ltd., specialized in R&D, design, production, and sales various drill bits. The drill bits size from 3″ to 26″ , HDD Hole opener from 8“- 48“ , Such as PDC bit, Roller bit, Tricone bit, PDC Coring bit, Bi-center bits, Hole opener, etc. The Company consistently adheres to the concept of industrial development to promote energy development, adhered to innovative drive, scientific development, and is one of the largest scale companies in Asia for PDC bit and Tricone bit, Hole opener manufacturer.
Our PDC bit production line includes Matrix body PDC bit and Steel body PDC bit. Tricone bit is mainly Three cone bits, and according to the drilling formation different, we have TCI bit and Steel tooth bit available. In some HDD(Horizontal directional drilling ) project, we have Rock reamers for hard formation. Our Roller bit core barrel is widely used for piling foundation too.
During the drilling process of conventional PDC bit, based on the affection of the shearing action of PDC cutting teeth, most of rock debris obtained is mostly fine sand with very small size, which cannot be accurately geologically seized and evaluated.
The design concept of the core-while-drilling bit is to remove 1-2 teeth in the center of the normal PDC bit. During the normal drilling process, the core is continuously formed in the center area of the bit without affecting the cutting structure of the bit.
When the length of the small-sized core is continuously increased to the nominal length, it will contact a core destruction device and cut off the core using lateral force. There is a larger and deeper groove in the middle of the two front blades, and the small-sized core will move into the annulus through this hollow area. This hollow area is always kept open to prevent the risk of blockage of a drill bit.
Compared with the traditional PDC bits, the advantages of core-while-drilling bits are:
1. It can increase the mechanical drilling speed. The cutting surface of the common drill bit has the lowest drilling speed in the center position. The new drill bit avoids it.
2. It can improve the quality of cuttings and form micro-cores for geological analysis and evaluation without having to repeatedly drill, which saving costs.
3. The stability of the drill bit can be strengthened, and the central core column can effectively prevent the eddy and lateral vibration of the drill bit, so that the outer cone cutting teeth are prevented from being subjected to a large impact load, thereby improving the drill bit service life.
Our brand is GREAT, founded in 2010, specialized in processing research of steel and diamond materials, is involved in the R&D, design, production, and sales of petroleum equipment, No-Dig. Up to now, we have to be the top drill bit manufacturers in china of CNPC, SINOPEC, CNOOC. We have a 40,000 m² of production based in Hejian provincial development zone, Hebei, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance diamond processing, with the annual production capacity of more than 10,000 pcs. We provide the drill bits from 3″ to 36″, Rock reamer from 8”- 72”, Such as PDC bit, Tricone bit, Roller bit, Diamond Core bit, Bi-center bit, PDC reamer, Hole opener, etc.。If you need to buy drill bits for rock and concrete,please contact us.
We, Cangzhou Great Drill Bits Co. Ltd., specialized in R&D, design, production, and sales various drill bits. The drill bits size from 3″ to 26″ , HDD Hole opener from 8“- 48“ , Such as PDC bit, Roller bit, Tricone bit, PDC Coring bit, Bi-center bits, Hole opener, etc. The Company consistently adheres to the concept of industrial development to promote energy development, adhered to innovative drive, scientific development, and is one of the largest scale companies in Asia for PDC bit and Tricone bit, Hole opener manufacturer.
Our PDC bit production line includes Matrix body PDC bit and Steel body PDC bit. Tricone bit is mainly Three cone bits, and according to the drilling formation different, we have TCI bit and Steel tooth bit available. In some HDD(Horizontal directional drilling ) project, we have Rock reamers for hard formation. Our Roller bit core barrel is widely used for piling foundation too.
Cangzhou Great Drill Bits Co.,Ltd. 