Double-stage double-rotating-speed well drilling device

A technology of rotating speed and drilling, which is applied to the driving device for drilling in the wellbore, drilling equipment, earthwork drilling and production, etc. It can solve the problems that it is difficult to use the high-speed cutting and drilling of the drill bit, affect the drilling speed, and the cutting speed difference between the two-stage drill bits is large. , achieve important social value and economic value, reduce energy consumption and overall cost, and achieve the effect of efficient and rapid drilling

Active Publication Date: 2015-04-29
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent 201210011193.1 mentions a two-stage and two-speed drilling tool. Although this structure realizes the function of two speeds of the two-stage drill bit, it still has the following deficiencies and cannot fully meet the requirements of on-site drilling technology
(1) The second-stage drill bit is connected to the drill string, and the rotation power and torque are provided by the ground, and the rock-breaking speed of the second-stage drill bit has a limited range of speed increase; (2) The two-stage drill bits have the same rotation direction, and the two-stage drill bit cannot shear and break rock (compressive strength of bottom hole rock>shear strength>tens

Method used

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  • Double-stage double-rotating-speed well drilling device

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Embodiment 1

[0021] Such as figure 1 , a two-stage double-speed drilling device includes an outer casing 1, a power assembly 2, a universal coupling 3, a central shaft 4, a variable speed and reversing input assembly 6, a variable speed and reversing conversion assembly 8, and a variable speed and reversing output Assembly, secondary drill bit, and primary drill joint, wherein: the power assembly 2 is connected to the upper end of the central shaft 4 through a universal coupling 3, the upper part of the central shaft 4 is processed with a bypass hole 5, and the primary drill joint 19 is connected At the lower end of the central shaft 4, the speed change and reversing input assembly 6 is fixedly connected with the central shaft 4, the speed change and reversing conversion assembly 8 is installed in the outer casing 1 through the rotating shaft 9, the speed change and reversing output assembly 10 is connected with the secondary drill bit 16 Fixed connection; the speed change and reversing in...

Embodiment 2

[0023] On the basis of the above-mentioned embodiment 1, it also includes: the speed change and reversing input assembly 6 and the speed change and reversing conversion assembly 8, and the speed and reversing conversion assembly 8 and the speed changing and reversing output assembly 10 are cogged.

[0024] A pressure bearing 14 is installed between the outer casing 1 and the secondary drill bit 16, a pressure bearing 18 is installed between the primary drill joint 19 and the shifting and reversing output assembly 10, and the external wall of the primary drill joint 19 and the internal wall of the secondary drill bit 16 are uniform. Inlaid with wear-resistant sheets, arranged in a staggered shape.

Embodiment 3

[0026] On the basis of the above embodiments, an oil storage tank 11 is designed and processed between the speed change and reversing output assembly 10 and the inner wall of the outer casing 1 , and lubricating oil resistant to high temperature and high pressure is sealed in the oil storage tank 11 .

[0027] Sealing devices 12, 13, 17 and 7, the bearing 15 is installed between the speed change reversing output assembly 10 and the central shaft 4.

[0028] The gear-tooth ratios of the gear-shift and reversing input assembly 6, the gear-shifting and reversing conversion assembly 8, and the gear-changing and reversing output assembly 10 are multiple combination adjustment structures.

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PUM

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Abstract

The invention relates to a double-stage double-rotating-speed well drilling device, and belongs to the industrial fields of oil and gas well drilling, geological prospecting, mine drilling, coal-bed gas development and the like. The double-stage double-rotating-speed well drilling device comprises an outer shell 1, a power assembly 2, a universal shaft coupling 3, a central shaft 4, a variable-speed reversing input assembly 6, a variable-speed reversing conversion assembly 8, a variable-speed reversing output assembly and a secondary drill bit and primary drill bit joint. The device is arranged on the lower part of a shaft bottom drilling tool combination, a small-sized guide hole is drilled according to the characteristic of high rock breaking speed of a primary small drill bit, and a part of the stress of rock is released, so that the rock breaking difficulty of a secondary large-sized drill bit is lowered, the overall well drilling speed is increased, and the control of a well deviation direction and stick-slip vibration is facilitated; the double-stage double-rotating-speed well drilling device has important practical significance to increase of the drilling speed of deep wells and super deep wells and prolonging of the service lives of a drill stem and drill bits. Meanwhile, the double-stage double-rotating-speed well drilling device further has the advantages of simple structure, convenience in operation, convenience in installation, safety and reliability.

Description

technical field [0001] The invention relates to a double-stage double-speed drilling device, which belongs to the fields of oil and gas drilling, coal bed gas drilling, geological exploration and mine drilling equipment. Background technique [0002] With the increasing difficulty of oil and gas field development and the rapid development of drilling technology, oil and gas fields have increasing requirements for drilling speed, especially the number of deep wells, ultra-deep wells, complex structure wells (horizontal wells with long horizontal sections, extended reach wells, branch wells, etc.) During the drilling process, with the increase of the drilling depth, not only the pressure of the drilling fluid column on the bottom of the hole is intensified, but also the strength, vertical stress, and horizontal stress of the formation rock itself increase accordingly, and the drillability of the formation rock As a result, the rate of penetration decreases, which not only affe...

Claims

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Application Information

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IPC IPC(8): E21B4/16
CPCE21B4/16
Inventor 李文飞周延军夏文安耿应春牛洪波李玄烨于丽丽于丽萍刘晓艳
Owner CHINA PETROCHEMICAL CORP
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