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Observation well liquid level test method of coal seam in-situ key parameters

A technology of key parameters and testing methods, applied in measurement, earthwork drilling, wellbore/well components, etc., can solve the problems of low-cost development of coalbed methane, high testing cost, complex construction, etc., to eliminate uncertainties and its harmfulness, solving the technical difficulties of well testing, and the effect of simple implementation

Active Publication Date: 2012-07-18
PETROCHINA CO LTD +2
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Problems solved by technology

[0008] (1) The cost of testing is high, requiring high-precision pressure, and it is difficult to adapt to the requirements of low-cost development of coalbed methane
[0009] (2) The construction is complex, requiring pressure gauges to be lowered into the bottom of the well and equipped with cables for power supply
[0010] (3) It is difficult to maintain. Once the downhole pressure gauge has a problem, the pipe string must be tripped

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  • Observation well liquid level test method of coal seam in-situ key parameters
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  • Observation well liquid level test method of coal seam in-situ key parameters

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Embodiment Construction

[0039]In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] The specific test method is as follows:

[0041] Set up at least one observation well around it according to the geological data of the coalbed methane well, and obtain the basic data of the observation well, use the optical fiber liquid level detection instrument to test the liquid level of the observation well, and obtain the liquid of the observation well at different time points surface data; the obtained liquid level data and basic data of the observation well are converted into the bottom hole pressure data of the measured observation well through calculation, and the reservoir parameters of the coal seam exploited by the coalbed methane well are obtained by analyzing the bottom hole pressure data; through The test data of ...

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Abstract

The invention discloses an observation well liquid level test method of coal seam in-situ key parameters. The test method comprises the steps of: setting at least one observation well around a coal seam gas well according to the geological data of the coal seam gas well and obtaining basic data of the observation well; testing the liquid level of the observation well by using an optic fiber liquid level detection instrument to obtain liquid level data of the observation well at different points of time; converting the obtained liquid level data and the basic data of the observation well into bottom-hole pressure data of the observation well through computation; analyzing the bottom-hole pressure data to obtain the pressure distribution around the coal seam gas well; and obtaining the reservoir stratum parameters of working coal seams of the coal seam gas well according to the change of the bottom-hole pressure of the observation well along with the time. The test method provided by the invention is simple; the liquid level data and the basic data of the observation well can be converted into bottom-hole pressure through computation as long as being obtained; and the test cost is low.

Description

technical field [0001] The invention relates to the technical field of oil and gas production engineering, in particular to a method for testing the liquid level of an observation well for in-situ key parameters of coal seams. By setting observation wells around coalbed gas wells and measuring the liquid level changes in the observation wells, it is possible to obtain convenient and accurate The parameters in the coal seam solve the technical difficulties of well testing in order to obtain these parameters in the prior art, and eliminate the uncertainty and harm caused by other well testing methods. 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...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/00E21B47/047E21B47/07E21B47/135
Inventor 赵培华韩军刘曰武周晓红张均峰苏中良欧阳伟平
Owner PETROCHINA CO LTD
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