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Acquisition method of stratum parameters of low pressure coal bed methane basin

A technology of formation parameters and acquisition methods, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as misleading reservoir understanding and evaluation, small injection volume, and distortion of acquisition parameters, and achieve continuous and stable data acquisition , to avoid the effect of discontinuity

Inactive Publication Date: 2015-03-04
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +2
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Problems solved by technology

[0002] The current well testing technology is not suitable for low-pressure and low-permeability reservoirs, the injection rate is small, the penetration radius is small, and the formation pollution during the drilling process makes the obtained parameters distorted, thus misleading the understanding and evaluation of the reservoir

Method used

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with embodiments.

[0030] A method for obtaining formation parameters of a low-pressure coalbed methane basin, characterized in that it comprises the following steps:

[0031] a. Test pipe string downhole

[0032] Pressure gauge recording data programming, after passing the inspection program, put it into the pressure gauge holder in the test string; if equipped with a steel wire or cable winch, use the winch to lower the pressure gauge after the test string is lowered into the bottom of the well; The pressure gauge is a high-precision storage-type electronic pressure gauge; the connection thread of the test string must be tightened during the downhole process to prevent leakage; the downhole process should be stable, and the test string should be lifted up if there is resistance, and the run can only be continued after the resistance is eliminated; Record the number and length of the test pipe str...

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Abstract

The invention relates to an acquisition method of stratum parameters of a low pressure coal bed methane basin. The acquisition method of the stratum parameters of the low pressure coal bed methane basin mainly includes following steps: keeping a well open for 24 hours after a test string descends the well so as to enable bottom hole pressure to tend to new balance; performing a micro fracture experiment before injection; using a high pressure pump with a constant pressure and constant current inlet to perform the injection; using a computer to continuously collect data in high density in data collection; using a high accuracy storage type electronic manometer in an underground monitoring system to monitor underground pressure and temperature. The acquisition method of the stratum parameters of the low pressure coal bed methane basin can accurately and fully acquire the stratum parameters, and is key for knowing a reservoir stratum, and performing reservoir stratum assessment and production performance monitoring.

Description

technical field [0001] The invention belongs to a method for acquiring stratum parameters of coalbed methane basins, and in particular discloses a method for acquiring stratum parameters of low-pressure coalbed methane basins. Background technique [0002] The current well testing technology is not suitable for low-pressure and low-permeability reservoirs. The injection rate is small, the penetration radius is small, and the formation pollution during the drilling process distorts the obtained parameters, thereby misleading the understanding and evaluation of the reservoir. [0003] Therefore, there is an urgent need for a new method for obtaining formation parameters in coalbed methane basins, which can obtain formation parameters more accurately and comprehensively. Contents of the invention [0004] The purpose of the present invention is to provide a method for acquiring stratum parameters in low-pressure coalbed methane basins, which can acquire stratum parameters mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/06
CPCE21B47/06E21B49/00
Inventor 刘同吉曹运兴曹永恒冯培文张大庆石玢周丹贾猛田林
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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