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Gas drilling ground manifold connecting structure

A technology of gas drilling and connection structure, which is applied in the direction of earthwork drilling, wellbore flushing, wellbore/well components, etc. It can solve the problems of maintenance and replacement of drill bits, the effect of reverse circulation formation, and the inability to establish annular pressure, etc. , to prevent the disturbed collapse of the borehole wall, improve the drilling efficiency and save the gas volume

Active Publication Date: 2015-12-23
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

This method is mainly used for reaming drilling in the coal mine industry, and has high requirements on the formation. If the formation fractures develop, the annular pressure cannot be established, and the effect of reverse circulation formation will also be affected.
At the same time, the rock-breaking tool used in this construction method is a cluster DTH hammer. The structure of this tool is a bit complicated, and maintenance and replacement of drill bits are a bit cumbersome.

Method used

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Effect test

Embodiment 1

[0031] As a preferred embodiment of the present invention, it includes: gas injection unit 1, pressure relief unit 2, flow meter 3, ground gas injection manifold 4, high pressure gas injection hose 5, erosion resistant gooseneck 18, high pressure reaction Circulating sand discharge hose 19, ground reverse circulation sand discharge pipeline 20 and positive circulation gas drilling sand discharge pipeline 23,

[0032] Wherein: the gas injection unit 1 and the pressure relief unit 2 are connected by a high-pressure pipeline, the outlet of the pressure relief unit 2 is installed with the flow meter 3, the upstream of the flow meter 3 is connected to the pressure relief unit 2, the downstream is connected to the ground gas injection manifold 4, and the ground injection The trachea manifold 4 is connected with the high-pressure gas injection hose 5;

[0033] The outlet of the erosion-resistant gooseneck 18 is connected to a high-pressure reverse-circulation sand discharge hose 19, and t...

Embodiment 2

[0037] On the basis of the above-mentioned embodiment, a sampling nipple 21 and a dust suppression water nipple 22 are installed on the reverse circulation sand discharge pipeline 20 leading to the grit tank. The gas injection unit 1 provides high-pressure gas, including an air compressor and a booster. The left end of the four-way is connected to the ground reverse circulation sand discharge pipeline 20 through valve C, the right end is connected to a three-way through valve E, the upper end is connected to mud pump 24 through valve D, and the lower end is connected to ground gas injection manifold 4 and ground gas injection manifold 4 through valve B. A valve A is also provided between the high-pressure gas injection hose 5.

Embodiment 3

[0039] The specific application example of the present invention: a whole-well section self-priming reverse circulation gas drilling system consists of the following equipment and tools: gas injection unit 1, pressure relief unit 2, flow meter 3, surface gas injection manifold 4, high pressure gas injection Hose 5, gas distribution joint 6, double wall upper cock 7, double wall kelly 8, double wall lower cock 9, double wall drill pipe 10, double wall drill collar 11, annular check valve 12, reverse circulation rock breaking Tools (reverse circulation air hammer, reverse circulation cone bit or reverse circulation PDC bit) 13, double wall drill pipe 14, wellhead device 15, rotary blowout preventer 16, water tap (or top drive) 17, erosion resistant gooseneck 18. High-pressure reverse circulation sand discharge hose 19, ground reverse circulation sand discharge pipeline 20, sampling nipple 21, dust suppression water nipple 22, positive circulation gas drilling sand discharge pipeli...

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PUM

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Abstract

The invention discloses a gas drilling ground manifold connecting structure. The gas drilling ground manifold connecting structure comprises a gas injection unit, a pressure relief unit, a flowmeter, a ground gas injection manifold, a high-pressure gas injection hose, an erosion-resistant gooseneck tube, a high-pressure reverse circulation sand discharging hose, a ground reverse circulation sand discharging pipeline and a normal circulation gas drilling sand discharging pipeline. The ground manifold connecting structure is used in a full-well-section self-suction type reverse circulation gas drilling system, conventional tools such as single-wall drilling tools and gas and water mixing joints are omitted, air serves as a circulatory medium in a full well section, and reverse circulation can be implemented without mud or other drilling fluid. The gas drilling ground manifold connecting structure is particularly suitable for well sections with serious water shortage, serious well leakage or incapability of implementing air lift reverse circulation drilling.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas drilling, in particular to a gas drilling ground manifold connection structure. Background technique [0002] Gas drilling technology can greatly increase the ROP in difficult-to-drill formations such as volcanic rocks, gravel layers, clastic rocks, and carbonate rocks. It is applied in areas such as Sichuan and Chongqing, and the average ROP is increased by 4 to 15 times. However, when positive circulation gas is used to drill wells (especially large-diameter wells), equipment investment is large, land occupation is large, gas consumption is large, energy consumption is high, and cost is high. 3 / min or more, 171 / 2″ borehole required gas volume of 300m 3 / min; when the stability of the borehole wall is poor, or the formation water yield is large, increasing the gas volume for gas drilling will intensify the erosion of the borehole wall and increase the possibility of borehole w...

Claims

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Application Information

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IPC IPC(8): E21B21/00
Inventor 范黎明韩烈祥刘殿琛董仕明廖兵罗群
Owner BC P INC CHINA NAT PETROLEUM CORP
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