Full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling

A technology for gas drilling and oil and gas drilling, which is used in liquid/gas jet drilling, wellbore/well components, and earth-moving drilling. It can prevent the disturbed collapse of the well 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 forma

Method used

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  • Full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling
  • Full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] As a preferred embodiment of the present invention, it includes a ground manifold connection structure and a drill tool assembly structure connected to the ground manifold connection structure. The ground manifold connection structure includes: a gas injection unit 1, a pressure relief unit 2 , Flowmeter 3, Ground gas injection manifold 4, High pressure gas injection hose 5, Erosion resistant gooseneck 18, High pressure reverse circulation sand discharge hose 19, Ground reverse circulation sand discharge pipeline 20 and positive circulation gas drilling sand discharge pipeline 23 ,

[0039] 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 man...

Example Embodiment

[0043] Example 2

[0044] 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.

Example Embodiment

[0045] Example 3

[0046] As another preferred embodiment of the present invention, it includes a ground manifold connection structure and a drill tool assembly structure connected to the ground manifold connection structure. The ground manifold connection structure includes: a gas injection unit 1, a pressure relief unit 2. Flow meter 3, ground gas injection manifold 4, high pressure gas injection hose 5, erosion resistant gooseneck 18, high pressure reverse circulation sand discharge hose 19, ground reverse circulation sand discharge pipeline 20 and positive circulation gas drilling sand discharge pipeline twenty three,

[0047] 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 ...

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Abstract

The invention discloses a full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling. The full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling comprises a ground manifold connecting structure and a drilling assembly structure connected with the ground manifold connecting structure; and the 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, a high-pressure reverse circulation sand discharging hose, a ground reverse circulation sand discharging pipeline and a normal circulation gas drilling sand discharging pipeline. Double-wall drilling rigs are used in a full well section, conventional tools such as single-wall drilling rigs and gas and water mixing joints are omitted, air serves as a circulatory medium in the full well section, and reverse circulation can be implemented without mud or other drilling fluid. The full-well-section self-suction type reverse circulation gas drilling system for oil and gas drilling 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 oil and gas drilling, in particular to a full-section self-priming reverse circulation gas drilling system for oil and gas drilling. 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 th...

Claims

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Application Information

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IPC IPC(8): E21B7/18E21B21/00
Inventor 范黎明邓虎王虎先羿蒋杰张国良李金和黄述春
Owner BC P INC CHINA NAT PETROLEUM CORP
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