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The use of diamond bits
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- Time of issue:2021-08-23 17:59
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The use of diamond bits
- Categories:News
- Author:
- Origin:
- Time of issue:2021-08-23 17:59
- Views:
Information
The use of diamond bits
The drill z that makes the cutting edge is called a diamond drill. The drill bit is a one-piece drill bit. The whole drill bit has no moving parts. The structure is relatively simple. It has high strength, high wear resistance and impact resistance. Field use has proved that the diamond drill 5 has the advantages of high speed, long footage, long life, stable operation, few downhole accidents and good wellbore quality when drilling in soft-to-medium-hard formations. The diamond bit can not only be used for a long time, but also can be reused. The diamond bit returned to the factory for repair is similar to the one from the factory, which can save a lot of drilling costs.
Advantage
1 The force balance design makes the drill bit have good steerability, suitable for directional drilling with downhole motor, and has less radial vibration;
2 Reasonable arrangement of patented PDC composite sheets of different structures at different positions of the drill bit makes the drill bit more aggressive and abrasive resistant;
3 The strong aggressive design enables the drill to obtain high ROP;
4 Dynamic flow field simulation technology is applied to hydraulic design to optimize the bottom hole flow field, which is beneficial to improve the speed of chip removal and prevent mud bag.
The use of diamond bits
rock breaking mechanism
The rock-breaking action of the diamond bit is done by diamond particles. To know the rock-breaking effect of the drill bit, it is necessary to understand the rock-breaking effect of single-grain diamond. In hard formations, single-grain diamond under the action of WOB puts the rock in a very high stress state (about 4200-5700MPa, some data believe that it can reach 6300MPa), so that the rock undergoes lithological transformation, from brittleness to plasticity. The single-grain diamond eats into the formation, and under the action of torque, it cuts and breaks the rock, and the cutting depth is basically equal to the eating depth of the diamond particles. This process is like "ploughing the ground", so it is called the plough cutting action of the diamond bit.
In some brittle rocks (such as sandstone, limestone, etc.), under the action of the WOB torque of the diamond particles on the drill bit, the volume of the broken rock is much larger than the intake and rotation volume of the diamond particles. When the pressure is not large, only small grooves can be formed along the direction of diamond movement. Increasing the pressure will break the rock in the deep part of the small groove and on both sides, exceeding the cross-sectional size of the diamond particles.
The use of diamond bits
The rock-breaking effect of a diamond bit is not only related to lithology and external factors (such as pressure, temperature, formation fluid properties, etc.) Like the roller cone bit, it has three methods of surface crushing, fatigue crushing and volume crushing when breaking rock. The ideal rock-breaking effect can only be achieved when the diamond particles have enough specific pressure to eat into the formation rock to cause the rock to be broken in volume.
use
one. Diamond drill bit preparation
1. Check the previous diamond bit for damage to the bit body, missing teeth, etc., and make sure that the bottom of the hole is clean and free of falling objects.
2. Carefully handle the diamond bit and place the diamond bit on a rubber pad or wooden board. It is forbidden to place the diamond drill directly on the iron plate.
3. Check whether the cutting teeth of the diamond drill are damaged, whether there is foreign matter in the diamond drill, whether there is an O-ring in the nozzle hole, and install the nozzle as required.
two. Diamond bit buckle
1. Clean the diamond bit male or female button and apply thread oil.
2. Put the shackle on the diamond bit, lower the drill string to make it contact with the male or female button and make it up.
3. Put the diamond drill bit and the shackle into the center of the turntable, and then tighten the screw according to the recommended tightening torque value.
three. drill down
1. Lower the diamond bit slowly, especially when passing through the turntable, blowout preventer and casing hanger to protect the cutting teeth. 2. Pay attention to the blocked well section that occurred during the last trip, and make the drill bit pass slowly when encountering shrinkage and dog legs during the trip.
3. When there is about 1 single root from the bottom of the well, start to rotate at the drilling speed of 50~60rpm and turn on the pump to flush the bottom of the well with a rated displacement.
4. Pay attention to the weight table and torque to make the diamond bit touch the bottom of the hole smoothly.
Four. diamond drill bit
1. It is not recommended to use diamond drill bits for well section reaming.
2. If scribing is necessary, the swiping should be carried out with the rated displacement and slow and low torque.
five. Diamond Bit Modeling
1. Keep the rated displacement, and lower the diamond bit to the bottom of the well.
2. Use slow drilling for at least 1m to establish a bottom hole model.
3. Increase the drilling pressure to the optimum value of normal drilling in increments of 10kN each time. It is strictly forbidden to pressurize too hard, which will cause the early damage of the diamond bit.
4. Keep the WOB constant and adjust the ROP to obtain the best combination of drilling parameters.
six. The diamond bit drills normally
1. When encountering strong abrasive or hard sandy mudstone, reduce the drilling speed to prolong the life of the diamond bit.
2. When encountering formation changes or interlayers, adjust the drilling speed and diamond bit to maintain good drilling performance.
3. Pay attention to the following points each time you receive an order: 3.1 Restore the pump stroke and check the riser pressure. 3.2 In
Turn on the pump before the diamond bit touches the bottom of the well, and slowly lower the diamond bit to the bottom of the well at a drilling speed of 50~60rpm. 3.3 Slowly restore the pressure to the original diamond bit, and then increase the ROP to the original ROP.
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Best Drilling Equipment (WUXI) Co., Ltd.
Address : No.130 Chuangxin West RD, Donggang Town, Xishan District, Wuxi City, Jiangsu Province, China214000
Contact: Karen Shao
Tel : 0086 510 88791230
Mobile phone : 0086 15052291658
Email : info@cnbestdrilling.com
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