Diamond bit
The quality of drill bit, the type of drill bit and the adaptability of formation lithology play an important role in accelerating drilling speed and improving the footage of a single drill bit. Usually, multiple drill bits with different sizes are used to drill an oil and gas well, and the drill bit with larger diameter is used to drill the upper layer. Because the stratum drilled by the drill bit is soft, the footage of a single drill bit is large and the service time is short, a drill bit can generally reuse several wells. However, when drilling the lower layer, a bit with a smaller diameter should be used.
Because the formation is hard and the footage of a single bit is small, it is generally necessary to use multiple bits. The drilling footage of a new bit in the well mainly depends on the size and type of the bit, the hardness of the formation and the cooperation of drilling parameters. Generally speaking, the smaller the bit size, the harder the formation and the less footage; The larger the bit size, the softer the formation and the larger the bit footage. Advantages of diamond bit
The 1 force balance design makes the bit have good steering, which is suitable for directional drilling of downhole motor with small radial vibration.
2. The rational arrangement of patented PDC compacts with different structures in different positions of the drill makes the drill more aggressive and wear-resistant;
3. Strong design enables the drill bit to obtain high ROP;
The application of dynamic flow field simulation technology in hydraulic design can optimize the bottom hole flow field, which is beneficial to improve the speed of chip removal and prevent mud balling.
Use of diamond bit
A, diamond bit preparation before drilling
1. Check whether the last diamond bit has bit body damage or tooth loss, and ensure that the bottom hole is clean without falling objects.
2. Carefully operate the diamond drill and put the diamond drill on a rubber pad or a wooden board. It is forbidden to put the diamond bit directly on the iron plate.
3. Check whether the cutting teeth of the diamond bit are damaged.
Whether there are foreign bodies in the diamond bit and O-ring in the nozzle hole, and install the nozzle as required. 2. Composition of diamond bit
1. Clean the pin or box of the diamond bit and coat it with thread oil.
2. Clamp the shackle on the diamond bit and lower the drill string to make it contact with the pin or box.
3. Put the diamond bit and the stripper into the bushing turntable, and then tighten the thread according to the recommended make-up torque.
Step 3 run into the hole
1. Lower the diamond bit slowly, especially through the rotary table, BOP and casing hanger, to protect the cutting teeth.
2. Pay attention to the blocked interval in the last trip, and make the drill bit pass slowly when tripping in and out meets shrinkage and dogleg.
3. When the distance from the bottom hole is about 1, start to rotate at the ROP of 50~60rpm, and start the pump to flush the bottom hole at the rated displacement.
4. Observe the weight indicator and torque, so that the diamond bit can contact the bottom hole smoothly.
Four. Drill a hole with a diamond bit
1. It is not recommended to use diamond drill to drill holes.
2. If drilling is necessary, it should be done slowly with low torque at rated displacement.
Verb (abbreviation of verb) diamond bit modeling
1. Keep the rated displacement and lower the diamond bit to the bottom of the well.
2. Establish the bottom hole model by slow drilling at least1m..
3. Increase WOB to the optimal value for normal drilling, and increase it by 10kN every time. Overpressure is strictly prohibited.
Leading to the early damage of the diamond bit. 4. Keep WOB unchanged and adjust ROP to obtain the best drilling parameter combination.
6. Normal drilling of diamond bit
1. When encountering abrasive or hard sandy mudstone, the ROP should be reduced to prolong the life of the diamond bit.
2. When encountering formation change or interlayer, adjust drilling speed and diamond bit to keep the best drilling efficiency.
3. Pay attention to the following points every time you take orders: 1. Resume the pump stroke and check the riser pressure. 2. Start the pump before the diamond bit contacts the bottom hole, and slowly lower the diamond bit to the bottom hole at a drilling speed of 50 ~ 60 rpm. 3. Slowly restore the pressure to the original diamond bit, and then increase the ROP to the original ROP.
Site use certificate
When drilling in soft-medium hard strata, diamond bit has the advantages of high speed, more footage, long service life, stable work, less downhole accidents and good wellbore quality. The diamond bit can be used for a long time and can be reused. The diamond bit returned to the factory for maintenance has the same use effect as the original diamond bit, which can save a lot of drilling costs.
Editor's summary: The above is the introduction of the correct use method and steps of diamond drill, hoping to help friends in need! Please continue to pay attention to our website for more information, and more exciting content will be presented later. You can also go to the mall to buy more products you like!
What, decorate with your own money? ! The renovation is carried out in stages, with an ultra-low annual interest rate of 3.55% and a maximum loan of 1 ten thousand. Apply for a discount now.
The drilling cost can be greatly saved.
Editor's summary: The above is the introduction of the correct use method and steps of diamond drill, hoping to help friends in need! Please continue to pay attention to our website for more information, and more exciting content will be presented later. You can also go to the mall to buy more products you like!
What, decorate with your own money? ! The renovation is carried out in stages, with an ultra-low annual interest rate of 3.55% and a maximum loan of 1 ten thousand. Apply for a discount now.