Safe and efficient mud drilling jet mill bit for horizontal wells

A technology for grinding drill bits and horizontal wells, which is applied to drill bits, drilling equipment, wellbore/well components, etc. It can solve problems such as reducing the ROP, and achieve the effects of increasing the ROP, reducing the final settlement velocity, and avoiding repeated crushing.

Active Publication Date: 2014-05-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the cuttings bed on site, short tripping and drilling are often carried out, and even large-grained cuttings near the drill bit are pushed back to the bottom of t...

Method used

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  • Safe and efficient mud drilling jet mill bit for horizontal wells
  • Safe and efficient mud drilling jet mill bit for horizontal wells
  • Safe and efficient mud drilling jet mill bit for horizontal wells

Examples

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Embodiment Construction

[0030] Such as figure 1 As shown, a jet mill bit for safe and efficient mud drilling in horizontal wells, including: 1. bypass, 2. crushing chamber, 3. throat, 4. reverse self-vibrating cavitation jet nozzle, 5. PDC bit body , 6. Drill bit blade, 7. Crushed target body, 8. Dissociation acceleration tube, 9. Mixing chamber, 10. Cuttings suction pipe, 11. Bottom cuttings mixing and cleaning flow channel, 12. Drill bit water eye nozzle . In summary, there are two main parts: the sand pump at the bottom of the drill bit, and the jet mill.

[0031] During the drilling process, the high-pressure drilling fluid enters through the main channel, and a part of the drilling fluid is ejected from the reverse self-vibrating cavitation jet nozzle 4 to form a high-speed cavitation pulse jet, which generates negative pressure in the mixing chamber 9, The negative pressure sucks the bottom hole fluid and cuttings through the cuttings suction pipe 10, thereby reducing the pressure difference ...

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Abstract

The invention discloses a safe and efficient mud drilling jet mill bit for horizontal wells. The safe and efficient mud drilling jet mill bit is characterized in that a jet crushing device and a high-concentration turbulence sand-pumping device are mounted on a conventional bit. The jet mill bit mainly comprises a jet crushing part and a high-concentration turbulence sand-pumping part. The jet crushing part is characterized by comprising reverse natural-vibration cavitation jet nozzles, mixing chambers, throat tubes, debris separation accelerating tubes, crushing targets, crushing chambers and bypasses; the high-concentration turbulence sand-pumping part is characterized by comprising well-bottom debris stirring and cleaning channels, debris suction tubes and bit nozzles. On the basis of principles of a sand pump, the debris suction tube and the well-bottom debris stirring and cleaning channel function in pumping high-concentration turbulence debris, so that well bottom pressure difference can be reduced effectively and mechanical drilling speed is increased; on the basis of the principles of the jet mill, debris is crushed further under hydraulic pulse cavitation jet effect, so that liquid and solid suspending flowing is achieved and debris beds formed in the horizontal wells is eliminated.

Description

technical field [0001] The invention belongs to the field of drilling and oil and gas engineering, in particular to a jet mill bit used for safe and efficient mud drilling of horizontal wells. Background technique [0002] As we all know, rock carrying is an important problem in drilling horizontal wells and extended reach wells. If the cuttings carrying effect cannot meet the requirements, it will lead to many problems, such as high friction and high torque, sand settling, pipe sticking, casing running and Difficulty in cementing, severe wear of drilling tools, difficulty in running logging instruments, etc., may even lead to suspension of drilling operations. However, one of the most important factors affecting the rock-carrying effect is the cuttings size. According to Stokes’ law, the final sedimentation velocity of cuttings is proportional to the square of the particle size of cuttings, so reducing the size of cuttings can greatly improve the carrying capacity. rock ef...

Claims

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Application Information

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IPC IPC(8): E21B10/60E21B7/18E21B21/00
Inventor 高德利陈绪跃郭柏云韦红术
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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