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Downhole power drilling tools for gas drilling

A technology for gas drilling and power drilling tools, which is applied to drilling driving devices, drilling equipment, earth-moving drilling, etc. and speed instability, to achieve the effect of convenient maintenance and matching, avoiding energy loss, and strong interchangeability

Active Publication Date: 2016-08-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Practice has shown that although this downhole power drilling tool based on the optimization and improvement of traditional mud screw drilling tools can basically meet the requirements of underbalanced drilling with foam and aeration as the medium, when the circulating medium is pure gas and atomized liquid, due to gas Compression causes the actual gas flow output through the screw motor to be unstable, and the output torque and rotational speed are also unstable, which cannot meet the requirements of on-site construction. easy to solve

Method used

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  • Downhole power drilling tools for gas drilling
  • Downhole power drilling tools for gas drilling
  • Downhole power drilling tools for gas drilling

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Effect test

Embodiment 1

[0044] Referring to the accompanying drawings in the specification, the present invention discloses a double-acting pneumatic short joint, which includes an upper joint 1, a check valve 2, a valve seat 3, a gasket a4, a flow plate 5, a diverter plug 6, a pneumatic piston 8, an outer cylinder 9. Inner cylinder 10, gas distribution cylinder 17, exhaust joint 20 and connecting rod 21. One end of the upper joint 1 is threadedly connected with the drilling tool assembly, and the other end is threaded with the outer cylinder 9; the valve seat 3 is positioned on the lower end of the upper joint 1 and the upper end of the distribution plate 5 through steps; the center hole of the valve seat 3 is equipped with a check valve 2, The gasket a4 is set between the valve seat 3 and the distribution plate 5; the distribution plate 5 is positioned inside the outer cylinder 9 through keys, and the diverter plug 6 is installed on the center hole of the distribution plate 5; several axial air chan...

Embodiment 2

[0047] With reference to the drawings in the description, the present invention discloses a double-acting hydraulic power nipple, including a top cover 23, an oil cylinder 32, an oil cylinder shell 34, a bottom cover 37, a rectangular one-way valve 24, a plug 25, a hydraulic plunger 29, a rib Plate 81, gasket b28 and gasket c35. The double-acting hydraulic power nipple is provided with three passages in the circumferential direction: the exhaust chamber 26, the pump oil chamber 33 and the oil return chamber 76; the exhaust chamber 26 consists of the top cover 23, the top cover shell 27, the oil cylinder 32, the oil cylinder shell 34 Bottom cover 37, bottom cover shell 36 and rib plate 81 form, and inlet is communicated with exhaust chamber 22, and outlet is communicated with exhaust cavity 26 of closed cycle liquid drive motor; The cover 37, the bottom cover shell 36 and the rib plate 81 are formed, the inlet is connected to the oil outlet of the front oil chamber pump oil val...

Embodiment 3

[0049] With reference to the drawings in the description, the present invention discloses a closed cycle liquid drive motor, which includes a bearing joint 42, a bearing joint housing 43, an anti-drop lock nut 40, an anti-drop connecting rod 45, a rotor 49, a stator housing 46, and a stator rubber Bushing 47, motor housing 48, cardan shaft assembly 51, cardan shaft assembly housing 55, cardan shaft assembly housing 56, oil return hole 52, oil drain hole 53, oil drain plug 54, gasket e44 and gasket f50. The double-acting hydraulic power nipple is provided with two passages, the exhaust cavity 26 and the oil return cavity 76 in the circumferential direction; the exhaust cavity 26 is composed of a bearing joint 42, a bearing joint housing 43, a stator housing 46, a motor housing 48, and a cardan shaft. The assembly shell 55, the cardan shaft assembly shell 56 and the rib plate 81 are formed, the inlet is connected with the exhaust chamber 26 of the double-acting hydraulic power n...

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Abstract

The invention discloses a downhole power drilling tool for gas drilling, which comprises a double-acting compressed air power sub-joint, a double-acting hydraulic power sub-joint, a closed circulation type liquid drive motor and a liquid-isolated and exhaust-driven sub-joint. Double-acting pneumatic power sub-joints, double-acting hydraulic power sub-joints, closed cycle liquid-driven motors, and liquid-isolation and exhaust transmission sub-joints are sequentially connected by threads, and the chambers of each part are aligned and sealed by gaskets; the gasket d is set at Between the double-acting hydraulic power nipple and the closed circulation hydraulic drive motor. The invention can convert gas energy into high-pressure liquid energy, and drive the rotor to rotate through the closed circulation of hydraulic oil in the volumetric motor, which overcomes the lack of power caused by the compressibility when the gas directly drives the motor, and also retains the gas as a cycle All the advantages of the medium effectively solve the downhole power problem of gas drilling horizontal wells, directional wells and extended reach wells.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling equipment, in particular to a downhole dynamic drilling tool for gas drilling, which is suitable for use in gas drilling horizontal wells, directional wells and extended-reach wells. Background technique [0002] At present, domestic oil and gas resource exploration is becoming more and more difficult, and the target has turned to low-yield, low-pressure, low-permeability and other difficult-to-exploit oil and gas reservoirs, which contain a large number of water-sensitive, salt-sensitive, alkali-sensitive and clastic rock formations, and the permeability after interaction with drilling filtrate It is difficult to achieve reservoir protection or discover new gas reservoirs with conventional drilling methods. Practical experience at home and abroad shows that the use of gas drilling technology is more conducive to the discovery and protection of oil and gas layers, while the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B4/02
Inventor 李宬晓范黎明肖洲周长虹邓虎曾绍清李金和
Owner BC P INC CHINA NAT PETROLEUM CORP
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