Gas production and water production section testing method of coal bed gas well and instrument

A test instrument and technology for coalbed methane wells, which are applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., to achieve the effects of reducing influence, high precision, and increasing flow rate

Active Publication Date: 2012-07-11
PETROCHINA CO LTD +2
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AI Technical Summary

Problems solved by technology

[0006] In order to realize the dynamic production monitoring of coalbed methane wells, solve the problem of layered gas production and water production profile testing compatible with coalbed methane well drainage conditions, and provide technical support for efficient development of coalbed methane, the embodiment of the present invention provides a coalbed methane well gas production , water production profile test method and instrument

Method used

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  • Gas production and water production section testing method of coal bed gas well and instrument
  • Gas production and water production section testing method of coal bed gas well and instrument
  • Gas production and water production section testing method of coal bed gas well and instrument

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1: The specific example of the test method for the current collection method is as follows

[0054] (1) Carry out a simulated coalbed methane well test experiment for the capacitance water content meter

[0055] Aiming at the gas-liquid two-phase flow, the feasibility experiment study was carried out indoors with a piezoresistive flowmeter. The sensor adopts a flow collection scheme, and all the fluid in the wellbore flows through the piezoresistive flowmeter through the flow collection umbrella. During the experiment, nitrogen and water were used as the medium. First keep the flow of water at 3m respectively 3 / d, 5m 3 / d, 10m 3 / d, 20m 3 / d remains unchanged, gas volume gradually increases, ranging from 50m 3 / d~2000m 3 / d to record the change in instrument response. Experimental results such as Figure 5 As shown, the abscissa in the figure represents the gas flow, and the ordinate is the response value of the instrument. It can be seen from the ...

Embodiment 2

[0072] Embodiment 2: The test example of the non-current collection method is as follows:

[0073] The quantitative test instrument is a differential pressure density meter, and the dynamic experimental research is carried out indoors with the differential pressure density meter. During the experiment, keep the flow of water at 3m 3 / d, 5m 3 / d, 10m 3 / d, 15m3 / d, 20m 3 / d remains unchanged, gas volume gradually increases, ranging from 50m 3 / d~2000m 3 / d to record the change in instrument response. According to the experimental data Figure 16 , the abscissa in the figure is the gas phase flow rate, the ordinate is the instrument response, and different curves represent different water flow rates. It can be seen from the figure that the response of the instrument decreases with the increase of air volume, and in the case of low water volume, it is less affected by the water volume.

[0074] Measuring range of differential pressure density meter:

[0075] Air flow: (5...

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Abstract

The invention discloses a gas production and water production section testing method of a coal bed gas well and an instrument. The testing instrument is placed in a casing of the coal bed gas well, a qualitative testing instrument qualitatively detects a gas production zone of a coal bed in the coal bed gas well, then a quantitative testing instrument quantitatively tests the gas production zone so as to measure a response value of the testing instrument, according to a quantitative plate of the testing instrument responding the same gas flow quantity via a simulated coal bed gas well in advance, gas flow quantity and water flow quantity which correspond to response of the quantitative testing instrument under the tested gas production zone are obtained, problems in terms of layered gas production and water production section testing corresponding to extraction conditions of the coal bed gas well are resolved, and the gas production and water production section testing method provides technical support for high-efficient development of coal bed gas.

Description

technical field [0001] The invention relates to the technical field of monitoring the production dynamic change characteristics of coalbed methane wells, in particular to a coalbed methane well gas production and water production profile test method and instrument, which solves the problem of layered gas production and water production profile testing adapted to the coalbed methane well drainage conditions problems, and provide technical support for the efficient development of coalbed methane. Background technique [0002] In the production process of coalbed methane wells, due to the influence of various factors, the production status of coalbed methane wells is constantly changing. It is of great significance to track the dynamic changes of production wells at any time, grasp the production situation of each coal seam, and make comprehensive adjustments to coalbed methane wells in time and improve the productivity of gas wells. [0003] The drainage technology of coalbed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/047
Inventor 杨秀春刘兴斌熊先钺李军胡金海李雷关松
Owner PETROCHINA CO LTD
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