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Low-pressure drilling technology using double-wall drill pipe

A double-wall drill pipe and drilling technology, which is applied in the directions of directional drilling, earth-moving drilling, flushing wellbore, etc., to achieve the effect that is conducive to popularization and application

Inactive Publication Date: 2007-07-11
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a double-walled drill pipe low-pressure drilling technology that can solve the problems of air-drilling wellbore trajectory control and conventional downhole dynamic drilling tools, and enable the air-drilling technology to be applied to directional wells, especially horizontal wells.

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Embodiment Construction

[0008] The present invention is provided by the following embodiments, which will be described below in conjunction with the accompanying drawings.

[0009] As shown in the figure: the process flow adopted by the present invention consists of air compressor 1, gas injection pipeline 2, drilling mud pump 3, pulse receiver 4, signal terminal display 5, rotary inflation joint 6, rotary control head 7, double-wall drill Rod 8, gas-liquid split joint 9 and gas-liquid separation system 10 constitute. In the figure, the number "11" is the borehole wall, and the numbers "12", "13", "14" and "15" are ordinary drill pipes, measurement-while-drilling instruments, power drilling tools and drill bits respectively. Among them, air compressor 1, gas charging pipeline 2, drilling mud pump 3, pulse receiver 4, signal terminal display 5, gas-liquid separation system 10, common drill pipe 12, measurement while drilling 13, power drilling tool 14 and drill bit 15 All are existing or conventional...

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Abstract

The invention relates to an under-balanced drilling technology with double-wall drill pipe for directional and horizontal wells with low-pressure oil reservoir in oilfield. In the technology injecting system comprising aerated joint, rotating control joint, double-wall drill pipe and gas-liquid dividing short segment is made use of to aerate certain compressed air and drilling fluid in well from the circular gap of double-wall drill pipe and central hole in circulating method. The compressed air enters into hole annulus from gas-liquid dividing joint at certain position in well and the drilling fluid returns up at the hole of drill bit. In the hole annulus, gas-liquid mixed segment and pure liquid segment with two different pressure gradient are formed so that unstable U-tubing effect is generated in well cylinder and the purpose of decreasing the pressure of liquid column is achieved. The under-balance drilling technology in invention can realize drilling well in low pressure and remove constraints that hole track of aerated drilling well can not be controlled and power drilling tool can not work normally under the aerated slurry status in aerated drilling process of directional and horizontal wells. It is favor of the popularization of aerated drilling technology.

Description

Technical field: [0001] The invention relates to a drilling technology for directional wells and horizontal wells in low-pressure oil reservoirs in oil fields. Background technique: [0002] As the development of the oilfield enters the middle and late stages, the formation pressure deficit in many main blocks is serious, and problems such as lost circulation, pipe sticking, and oil layer pollution have become difficult points in the drilling technology of the oilfield in the middle and late stages. Flat well) is an important means to improve the recovery rate of the main oil reservoir and maintain the stable production of the oil field. Therefore, the low-pressure drilling technology for this kind of low-pressure oil reservoir has become an important technical support to solve the above-mentioned difficulties in the drilling process. Low-pressure drilling refers to the use of drilling fluid density below 1.0g / cm 3 drilling construction. Generally speaking, when using pure...

Claims

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Application Information

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IPC IPC(8): E21B21/14E21B7/04
Inventor 李永和吴兴国陈思路
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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