Permanent pressure meter testing technique for coal bed gas observation well

Abstract

The invention discloses a permanent pressure meter testing technique for a coal bed gas observation well, which comprises the following steps of: arranging one or more observation wells in a set distance around the coal bed gas well, putting a permanent pressure meter into the observation well to perform interference-free in situ test, and acquiring a critical desorption pressure value at the well point of the observation well and a time reaching the critical desorption pressure so as to acquire an expansion speed of a coal bed gas desorption expansion range. The pressure at the well point of the observation well is measured by analysis, and the pressure distribution around the coal bed gas well can be obtained. The reservoir parameter of an exploited coal bed of the coal bed gas well and the crack direction of a fractured well can be obtained by analyzing the test data of the observation well. The pressure change around the coal bed gas well can be conveniently monitored by arranging the observation well around the coal bed gas well and arranging the permanent electronic pressure meter in the coal bed gas well, the pressure distribution is visualized, the coal bed gas reservoir parameter in the coal bed gas well can be effectively and reliably obtained, and the data accuracy of coal bed gas exploitation is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas production engineering, in particular to a permanent pressure gauge testing technology for a coalbed gas observation well. Background technique [0002] Coalbed methane is an efficient and clean unconventional natural gas resource. At present, coalbed methane resources are actively developed at home and abroad to alleviate the energy crisis, and to carry out sustainable energy development on the premise of protecting the environment. Large-scale commercial development of coalbed methane in my country is imminent. Reasonable and efficient development of coal seam resources must rely on the dynamic monitoring of coalbed methane, and coalbed methane well testing technology is the main source of dynamic data for the formulation and adjustment of coalbed methane reservoir development plans, and can be called the "eyes" of coalbed methane reservoir engineers. However, because coalbed methane belong...

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Problems solved by technology

However, because coalbed methane belongs to unconventional gas reservoirs, the desorption mechanism during its exploitation and the deformation mechanism of coal seams make it difficult for conventional oil and gas reservoir testing methods such as pressure recovery test and pressure drop test to be accurately applied to coalbed methane reservoirs.

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