The drill bit that makes the cutting edge is called a diamond drill bit. The drill bit is an integrated drill bit. The entire drill bit has no moving parts. The structure is relatively simple, with high strength, high wear resistance and impact resistance. It is one of the three new technologies of drilling in the world in the 1980s. Diamond drills are not only used for a long time, but can also be reused. The use of diamond drills returned to the factory for repair is similar to that of factory-made diamond drills, which can save a lot of drilling costs. For those who have needs in this area, diamond bit price is one of the primary concerns. Don't worry, let me introduce you to the relevant knowledge of diamond drill bit prices . I hope it will help you.
Introduction of Diamond Bit
The quality of the bit, whether the bit type is compatible with the lithology of the formation, plays an important role in accelerating the drilling speed and increasing the single-foot length. When drilling an oil and gas well, multiple drill bits of different sizes are generally used. When drilling the upper stratum, a drill with a larger diameter is used. Because the drill bit drills into a softer formation, a single drill bit has more footage and a shorter time to use. Several wells can be re-used; when drilling lower formations, a drill bit with a smaller diameter should be used. Because the formation is hard and the footage of a single drill bit is small, multiple drill bits are generally used. The drilling length of a new drill bit depends mainly on the drill bit size, type, formation hardness and drilling parameters. Generally speaking, the smaller the drill bit size and the harder the formation, the less the footage; the larger the drill bit size and the softer the formation, the more the drill footage.
Advantages of diamond bits
1 The force balance design makes the drill bit have good guidance, suitable for use with downhole motors for directional drilling, with small radial vibration;
2 The reasonable arrangement of the patented PDC composite sheets of different structures at different positions of the drill bit makes the drill bit more aggressive and resistant to abrasion;
3 Strong aggressive design enables the drill to obtain high mechanical drilling speed;
4 The dynamic flow field simulation technology is applied in hydraulic design to optimize the flow field at the bottom of the well, which is conducive to improving the speed of chip removal and the mud bag.
Rock breaking mechanism of diamond bit
The rock-breaking effect of diamond bits is completed by diamond particles. To know the rock-breaking effect of the drill bit, we must understand the rock-breaking effect of single diamond. In hard formations, single-grain diamonds put the rock under extremely high stress (about 4200-5700MPa, some data think it can be up to 6300MPa) under the effect of weight-on-bit, causing the rock to undergo lithological transformation from brittleness to plasticity. The single-grain diamonds are eaten into the formation, and the rock is cut under the action of torque. The cutting depth is basically equal to the depth of the diamond particles. This process is like "plowing the ground" so it is called the plow cutting effect of diamond drill bits.
In some brittle rocks (such as sandstone, limestone, etc.), the diamond particles on the drill bit under the effect of the weight-on-bit torque, the volume of broken rock is much larger than the volume of diamond particles eaten and rotated. When the pressure is not large, only small grooves can be formed along the direction of movement of the diamond. Increasing the pressure will break the deep groove of the small groove and the rocks on both sides, exceeding the cross-sectional size of the diamond particles.
The rock-breaking effect of diamond bits is related to lithology and external factors (such as pressure, temperature, formation fluid properties, etc.) that affect lithology, and the weight-on-bit is an important influencing factor. Like rock cone bit, it has three methods of surface breaking, fatigue breaking and volume breaking when rock breaking. Only when the diamond particles have enough specific pressure to feed into the formation rock, and the volume of the rock is broken, can the ideal rock breaking effect be achieved.
Diamond drill price
The price of diamond drills is not expensive. It is not easy to say that different manufacturers offer different prices. Because diamond drills have different specifications and sizes and different requirements for different parameters, it is recommended to find an old manufacturer with a large point to ask Ask, the ordinary factories will not talk about it, there is no quality assurance, and there are high security risks. Now consulting diamond drill prices are all looking for large companies. After all, they are more quality guaranteed and do not have to worry about after-sales problems.
Use of diamond bit
One. Diamond drill bit preparation before drilling
1. Check whether there is any damage to the drill body or teeth on the last diamond drill bit, and make sure that the bottom of the well is clean and free of falling objects.
2. Carry the diamond drill carefully, and place the diamond drill on the rubber pad or wooden board. It is forbidden to place the diamond bit directly on the iron plate.
3. Check whether the cutting teeth of the diamond drill are damaged, whether there are foreign objects in the diamond drill, and whether there is an O-ring in the nozzle hole. Install the nozzle as required.
two. Diamond drill buckle
1. Clean the male or female buckle of the diamond drill bit and apply silk buckle oil.
2. Clamp the shackle on the diamond drill bit, and lower the drill string to make it contact with the male or female buckle.
3. Put the diamond drill bit and the buckle together into the turntable to fill the heart, and then tighten the screw according to the recommended buckling torque value.
three. Drill down
1. Lower the diamond drill bit slowly, especially through the turntable, BOP and casing hanger to protect the cutting teeth.
2. Pay attention to the blocked well section that occurred during the last drilling. When the drilling process encounters diameter reduction and dog legs, the drill bit should be passed slowly.
3. When it is about 1 single from the bottom of the well, it starts to rotate at a drilling speed of 50 ~ 60rpm and pumps a rated displacement to flush the bottom of the well.
4. Observe the weight indicator and torque to make the diamond bit contact the bottom of the well.
four. Diamond drill scoring
1. It is not recommended to use diamond drill bit for scoring the well section.
2. If it is necessary to squint, it should be squinted slowly and at low torque with rated displacement.
Fives. Diamond drill shape
1. Maintain 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 weight to the best value for normal drilling with an increase of 10kN each time. It is strictly forbidden to press too hard, which will lead to the early damage of the diamond bit.
4. Keep the weight on bit constant to adjust the drilling speed in order to obtain the best combination of drilling parameters.
six. Diamond drill bit is drilling normally
1. When encountering abrasive or hard sand mudstone, reduce the drilling speed to prolong the life of the diamond bit.
2. Adjust the drilling speed and diamond bit to meet the best drilling efficiency when encountering formation changes or interlayers.
3. Pay attention to the following points each time a single root is connected: 3.1 Restore the pump stroke number and check the riser pressure. 3.2 In
Start the pump before the diamond bit contacts the bottom of the well, and slowly lower the diamond bit to the bottom of the well at a drilling speed of 50-60 rpm. Slowly restore the pressure to the original diamond bit, and then increase the drilling speed to the original drilling speed.
Proof of use on site
When drilling in soft-medium hard formations, diamond drill bits have the advantages of fast speed, more footage, long life, stable work, fewer downhole accidents, and good wellbore quality. Diamond drills are not only used for a long time, but can also be reused. The use of diamond drills returned to the factory for repair is similar to that of factory-made diamond drills, which can save a lot of drilling costs.
Editor's summary: The above is the introduction of the correct use of diamond drill bit diamond drill bit, I hope to help friends who have needs in this regard! For more related information, please continue to follow our website, and more exciting content will be presented in the future. You can also go to Qijia Mall to buy more products you like!
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