1. Choose the drill bit types appropriately

(1) According to the lithology of the drilled formation, the following principles should be followed when selecting the type of drill bit:

a. In the shallow well section where the rock is cemented and loose, the drilling speed of the drill bit and the prevention of mud packs should be considered;

b. In the deep well section where the trip is long, the footage of the drill bit should be considered;

c. When the outer row teeth of the drill bit out of the well are severely worn, a bit with gauge teeth should be used;

d. In the easy deviating well section, a bit with small slip and many short teeth should be used;

e. Wedge-shaped tooth drills should be used when selecting insert drills;

f. For diamond limestone, it is advisable to use double-cone-tooth and projectile-shaped tooth drill bits;

g. When there is more shale in the formation or the density of drilling fluid is higher, a bit with a larger slip amount should be selected;

h. When the stratum is limestone or sandstone, and a bit with a smaller slip amount should be selected;

i. When drilling hard and highly abrasive stratum, it is advisable to use pure rolling button and double bevel bit.

(2) In order to optimize the hydraulic parameters of tricone bit, the longer nozzle and unequal diameter combined nozzle bit should be preferred. You may be interested in tricone bits manufacturers and get more information.

2. Inspection of a drill bit before drilling

(1) Check whether the model and diameter of selected bit meet the requirements;

(2) Carefully check whether the thread, weld and teeth of the drill are in good condition;

(3) Check whether the nozzle is installed firmly and the water hole should be unblocked; when rotating the cone of the rock bit by hand, the bearing seal should be intact; the pressure compensation system of the drill bit should be intact, and the pressure relief hole should not be blocked.

3. Matters needing attention when a drill bit enters the well

(1) After cleaning the drill thread, apply special thread oil;

(2) Choose a suitable loading and unloading device, and do not jerk when the drill bit is put into the loading and unloading device;

(3) Tighten according to the specified torque;

(4) The drilling operation should be stable, and no hard pressure should be encountered in case of resistance. Drilling of the insert bit should be slow to avoid damage to the alloy teeth in the hard formation and irregular hole;

(5) When drilling down and encountering an obstruction, the depth of the well, the situation and time of the obstruction should be noted, so as to determine the cause of the obstruction and control the working time;

(6) Drill down to a certain distance to the bottom of the well (a single root). The pump should be turned on and the turntable should be slowly lowered. It is strictly forbidden to go down to the bottom to open the pump.

4. Precautions for drilling of a drill bit

(1) The new drill bit should be run-in lightly for about half an hour, and then gradually increase to the specified WOB, and it is strictly forbidden to pressurize to start the turntable;

(2) Concentrate and deliver the drill evenly when operating the brake lever to prevent accidents of slipping and sudden drills;

(3) During roller bit drilling, the changes in lithology and the working conditions of the bit should be analyzed at any time according to the change of the drill pair and the operation of the bit, and the drilling parameters should be adjusted in time.

5. Determine the starting time of a drill bit

(1) Determine according to the wear of the bearing and teeth, the phenomenon of bearing damage:

The turntable has periodic jumps. If the bit pressure is small, the jump is light. If the bit pressure is big, the jump is heavy; the drilling speed drops; the pump pressure is normal but the pointer of the weight indicator swings.

(2) The phenomenon of cone jamming:

The load on the turntable increases; the turntable chain jumps; the kelly rod is crappy; the turntable is stopped and the car is reversed; the drilling speed drops; the weight indicator pointer swings severely.

(3) The phenomenon of tooth grinding (stripping):

The load of the turntable is reduced; the kelly does not jump; the drilling speed is significantly reduced or there is no footage; the weight indicator indicates smooth and no swing; the pump pressure is normal.

Learn more about pdc core bit, rock reamer, tooth bit, polycrystalline diamond drill bits, mining drill bit, etc.

For more information about china hammer drill bit and tricone bit drilling, please feel free to contact us

what is a pdc bit? 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 bits are widely used in oil drilling.

Structure Characteristics of Drilling pdc rock drill bit

PDC bit is composed of the a bit body, PDC cutting teeth and a nozzle. According to different structures and drill bit manufacturing processes, the drilling PDC bit are divided into two series: steel body and matrix body.

The whole bit body of rigid drilling pdc bit components is made of medium carbon steel and formed by the 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 a surface hardening process (spraying tungsten carbide wear-resistant layer, carburizing, etc.) to enhance its erosion resistance. The main advantage of this kind of drilling PDC bit is a simple pdc bit 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 the drilling PDC bit is made of steel and the lower part is made of WC wear-resistant alloy. The pdc rock drill bits 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.

Working Principle of PDC Drilling Bits

Drilling PDC drilling  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. When multiple PDC cutting teeth work at the same time, and there are many free faces of the bottom rock, the rock is easy to be broken under the shear action. That’s way PDC drilling bit has higher rock-breaking efficiency ans faster drilling speed.

Correct Use of PDC Rock Bits

Diamond 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.

Before the PDC rock bit is put into the well, the bottom of the well shall be clean to ensure that there is no metal falls.

When the PDC rock bit is just put into the well, it should adopt small bit pressure and low rotation speed to run, andresume normal drilling until the bottom of the well is formed.

PDC drilling bit is an integral bit without any moving parts, suitable for high-speed turbo drilling.

Drilling PDC bits produced by Great Drill Bit, a leading pdc cutter manufacturer, are featuring good drilling effects like low WOB, high rotation speed and large displacement.

For more information about diamond drill bit for china, please feel free to contact us

The Composition of Oil Well Drill Bits

The oil wellbit is a widely used drilling bits adapting to a wide range of formations and featuering high drilling speed. The oil well drill bit is composed of more than 20 parts such as cutting structure, bearing structure, locking element, oil storage seal installation and nozzle installation. The current motor is repeatedly used in the wellbore, forming a front part of that has greater rigidity, smaller relative discharge area, and higher relative return velocity. The upper annulus is taken to form a vortex that affects the cuttings at the front. The formation of accumulation affects the drilling speed, and further formation of the repeated fragmentation of those cuttings by the PDC drill bit, which is easy to form a mud pack of the bit remover.

What Are the Advantages of Oil Well Drill Bits?

(1) The steel ball is used in the wellbit to lock the roller, suitable for relatively high speed.

(2) The O-ring seal adopts a wear-resistant, highly saturated nitrile rubber, which increases the cross-section of the seal ring. And the outer end of the seal area adds a small sealing boss to improve the sealing performance.

(3) The oil well drill bit uses high-strength and high-toughness alloy teeth, which improves the ability of resisting impact and reducing the probability of tooth breakage. Soft formations are inlaid with spoon-shaped teeth.

(4) The bearing of the palm of the oil well bit is covered with a layer of hard alloy, and there is also a silver-plated layer on the roller shaft to improve the anti-bite and load-bearing capacity.

(5) The oilfield bits use a grease that can withstand a temperature of 250°C, and low wear improves the ability of the drill bit.

(6)The optimized number of teeth of the oil well bit and the equipment such as exposed teeth and alloy teeth can uplift the bit cutting speed at a larger height.

Cangzhou Great Drill Bits Co.,Ltd., as an excellent rock drill bit suppliers, offers a wide range of china rock drill for you to choose from.

The Cause of PDC Bit Balling 

The Common Phenomenon of PDC Drill Bit Balling　　

Sometimes when you use a PDC drill bit for a long period of time, you will find it there is something wrong about it, like the follwing;

The footage is obviously slower or higher when drilling;

Increasing or reducing WOB has no obvious effect on drilling speed;

It has little effect on the drilling rate when the formation changes;

Drilling tool puncture and the circulation short circuit occur during the drilling,  and the drilling speed obviously slows down after treatment.

The teeth of the drill bit cannot effectively penetrate into the formation, showing that the torque is reduced or the torque fluctuation range is reduced;

The phenomenon of “piston pulling” occurs during tripping and drilling.

Causes of PDC Bit Balling

Above phenomenon occurs because that your PDC bit is balling ,and here Great Bit, a professional drill bit manufacturer, listed four main reasons may cause balling of PDC bit:

Geological Factors:

The drilled stratum is soft mud with non-diagenetic upper part, which is very easy to stick to the surface of the drill bit, which will cause balling of the drill bit after compaction.

Although the shale in the stratum is diagenetic, it is easy to hydrate and disperse, making the mud or solid phase in the wellbore greatly increases, which is adsorbed on the surface of the drill bit and causes the bit balling.

Or the formation contains dispersed gypsum, which causes mud pollution, and the harmful solid phase in the mud is difficult to remove, which greatly increases the probability of formation of bit balling.

Under the action of the pressure difference, the harmful solid phase in the wellbore and the cuttings that are not carried out in time are absorbed to form a thick mud cake, which accumulates under the diamond PDC bit when starting the drill, causing the bit balling.

Mud Performance Factors:

Poor mud inhibition, unable to control the hydration and dispersion of shale;

Too high solid content and sticky cut, the drilled cuttings are difficult to remove and are easily adsorbed on the surface of the drill bit.

If a solid-free phase drilling fluid is used, the drill bits will never have mud packs;

The proportion of mud is too high, the water loss is large, and thick mud cakes are easily formed;

The lubrication performance is poor, the surface of the drill bit cannot form an effective protective film, and the inferior solids in the drilling fluid are easily adsorbed on the drill bit.

Engineering Technical Factors:

The drilling displacement is small, the bottom hole and the drill bit cannot be cleaned effectively, and the upward and backward speed is insufficient.

The cuttings stay in the well for a long time and adhere to the well wall to form a thick mud cake, especially in the upper part of the drill.

It is more serious when the speed is high; in the soft mudstone formation, the drilling pressure is too high, the formation or the drill cuttings and the surface of the drill bit form direct contact, causing the bit balling;

The long open hole drilling does not carry out halfway circulation, and the mud cake scraped from the well wall or drill cuttings will cause the drill bit balling.

Drill Bit Selection Factors:

The water eye design cannot meet the chip removal requirements;

The channel chip removal angle prevents the drilling cuttings from smoothly leaving the bottom of the well.

Cangzhou Great Drill Bits Co.,Ltd., as an excellent rock drill bit suppliers, offers a wide range of pdc bit for you to choose from.

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 cone bit, 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.

Cangzhou Great Drill Bits Co.,Ltd., as an excellent oil drill bit manufacturers, offers a wide range of pdc bit for you to choose from.

Our pdc bit breaker and bi-center bit, PDC reamer with iron packaging, equipped with high-quality shackle device, convenient for the extraction and installation of the bit; The special suspension design can better guarantee the safety of the PDC bit crown composite during transportation. Generally speaking, our PDC bit package with bit breaker and extra nozzles if needs.

Our Tricone bit package is a carton box with our logo or wooden box according to customer request.

We guaranteed all the packages are safety for shipping and the packaging material is allowed to export. Our good quality packages also can be used more times.

Depends on the orders quantity, we have the below shipping suggestions:

DHL: Sample bit; Door to Door, fastest.

By air: Urgent orders.

By ocean or by Train: Normal orders.

We have organized the shipping department, they will arrange all the shipping if the sales department sends a request shipping. Firstly, we will check the safest, fastest, and cheapest cargo shipping company shipment the bits to China Port. Our broker will arrange to load according to the customer request, and the tracking number or BOL will be provided when sailing. Also will be checking the ETA. So that our customers can arrange customs our bits.

Cangzhou Great Drill Bits Co.,Ltd., as an excellent oil drill bit companies, offers a wide range of pdc bit for you to choose from.

Horizontal Directional Drilling (hdd drill bit) is not excavation surface conditions, the laying of a variety of underground utilities (pipes, cables, etc.) of a drilling way, it is widely used in water supply, electricity, telecommunications, gas, gas, oil and other pipeline construction, it is suitable for sand, clay, pebbles and etc. GREAT can choose different models according to different formation of pipeline construction.

Recommended Size and Horizontal Directional Drill Bits Types

As a professional supplier and manufacturer of HDD drill bits, GREAT can provide recommended operating parameters and guidelines for optimal use.

Cangzhou Great Drill Bits Co.,Ltd. is a oil well drill bit manufacturers, we have china rock drill tools for sale, rock drill bit, directional drill bits for sale and etc. For more information, please feel free to contact us!

Geothermal drilling characteristics of geothermal drilling the main oil and gas well drilling technology for reference, because the heat reservoir rock geological conditions, such as lithology, buried depth and output fluid property is different, compared with more demanding conditions of oil and gas drilling, geothermal drilling, but also for geothermal well characteristic of the high temperature and large diameter to new technology and new equipment improvement and development.

Characteristics of Geothermal Drilling

Compared with oil and gas drilling, geothermal drilling has the following characteristics:

High temperature, great variation in buried depth.

The rock is hard, abrasive and high in-situ stress heat storage rocks are mostly volcanic and metamorphic rocks. Compared with the deposition rock of oil and gas wells, the rock is hard, abrasive and high in-situ stress, and the stratum is broken and often unstable.

The crack height is developed, and even centimeter-grade cracks exist.

Formation pressure is low and leakage is serious.

The formation often contains corrosive fluid, which is corrosive to drilling string, casing, etc.

This requires the production of expensive titanium alloy bushing and the development of special cement.

The geothermal well has a large diameter, many casing procedures and a large amount of cement.

Recommended Geothermal oil well drill bit types

Drilling a geothermal well is similar to drilling oil, gas and well. In order to overcome the special difficulties in drilling, drilling methods, flushing media, drilling tools, casing head structure, wellhead device and other appropriate technical measures should be adopted.

The drill pipe and drill collar with high-temperature resistance, corrosion resistance, low coefficient of thermal expansion and high strength should be used in the drill pipe and drill collar.

And we will recommend high-quality PDC bit and Tricone bit of GREAT.

For more information about drill bit types oil and gas and more, please feel free to contact us!

Cangzhou Great Drill Bits Co.,Ltd. , as an excellent rock drill bits manufacturers, offers a wide range of face wash for you to choose from.

Overview of Tricone Bit

Tricone bit is mainly used in drilling, exploration, petroleum and trenchless as pilot bit.

According to cutting material, Tricone bit can be divided into TCI bit and Steel tooth Bit.  

TCI bit adopts high-strength and high-toughness hard alloy teeth, optimized design of tooth row number, tooth number, tooth exposure height, and unique alloy tooth shape, giving full play to TCI bit’s high wear resistance and excellent cutting ability.

New wear-resistant material is applied to weld the tooth surface of the Steel tooth bit, which can maintain the high penetration rate of the Steel tooth bit and improve the life of the cutting tooth of the bit.

According to the type of bearing, the tricone rotary drill bits can be further divided into metal seal bearing and rubber seal bearing.

TCI Bit

Tricone bit is an important tool for oil drilling.

Steel Tooth Bit

Steel tooth drills are suitable for extremely soft formations with low compressive strength and high drillability such as clay, mudstone, chalk, etc..

Tricone Bit Features

High strength and toughness carbide teeth are adopted to improve the impact resistance of teeth and reduce the rate of broken teeth;

Optimized design of tooth row number, tooth number, exposed tooth height, and unique alloy tooth shape, giving full play to the cutting ability and cutting speed of the tricone rock bit;

The clamping roller is adapted to withstand high drilling pressure;

Insert and weld the grinding gold in the inner hole of the roller to improve the anti-bite ability of the bearing;

The use of high saturated nitrile rubber O seal ring, the optimization of sealing compression to improve the reliability of bearing seal;

Adopt an all-rubber oil storage capsule that can limit the pressure difference and prevent drilling fluid from entering the lubrication system, provide good lubrication for the bearing system, ensure the normal operation of “O” seal ring, and improve the working life of the drill bit;

Adopt a new grease with a high-temperature resistance of 250℃ and low wear to improve the high-temperature resistance of the bit sealing lubrication system.

As a professional  tricone bit supplier in China, GREAT are glad to share our production line of Tricone bit via email or online tools. Do not hesitate to contact us for further understanding of our tricone bits.

What Will a Tricone Drill Bit Do?

Ideal for different rock formations ranging from soft to hard ones, the tricone rock bit is, in fact, a great progress in drilling technology. You can spot the existence of tricone bits from simple water well drilling to industrial oil extraction. Normally located in the bottom hole assembly, the tricone rock bits can cut away the surface of various kinds of rocks by rotation and the friction caused by the teeth. With the help pf the protruding teeth, tricone bits can effectively cut through the surface of the rock without getting clogged. As one of the mature tricone bits manufacturers in China, GREAT offers high-quality tricone bits for sale at competitive marketing prices. Feel free to contact us at any time!

Great Drill Bits as one of the tricone bits suppliers,we have tricone drill bit design, tricone bit for well drilling and etc. For oil field drill bits prices or tricone bit sizes, please feel free to contact us!

There are many mining drill bit manufacturers, but we are one of the best choices for you.

Overview of TCI Bit

TCI Tricone bit is an important tool for oil drilling. When the cone 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 eat into the formation; the total length of the working edge is large, so the wear is relatively reduced. The roller cone bit can accommodate a variety of formations from soft to hard.

Tooth shape includes wedge-shaped tooth(X), wide top tooth (K), spoon type tooth (S), conical-ended shape tooth(Y), hemispherical ended shape tooth(Y1), gage protection by diamond enhanced cutters on cone (F), a flat diamond tooth (P). Different tooth types are selected according to different strata.

The Advantage of TCI Bit

TCI drill bit adopts high-strength and high-toughness hard alloy teeth, optimizes the design of tooth row number, tooth number, tooth exposure height, and unique alloy tooth shape, giving full play to insert bit’s high abrasion resistance and excellent cutting ability. New wear-resistant material is applied to weld the tooth surface of the steel tooth bit, which can maintain the high penetration rate of the steel tooth bit and improve the life of the cutting teeth of the bit.

Adopting a floating bearing structure, the floating element of this tricone drill bit for sale is made of new material with high strength, high elasticity, high-temperature resistance, and high wear resistance, and the surface is treated with solid lubricant. While reducing the relative linear velocity of the bearing pair, the friction surface temperature rise is reduced, and the bearing life and bearing reliability under high drilling pressure or high-speed drilling process conditions can be effectively improved.

Great Drill Bits is a rock drill bit factory, we have china diamond drill bit for sale, rock drill bit, tungsten carbide rock drill bits,tci tricone drill bit, tungsten carbide insert bit and etc. For more information, please feel free to contact us!