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A method for monitoring coal powder content in coalbed methane well output fluid

A technology for coalbed methane wells and produced fluids, which is applied to earthwork drilling, wellbore/well components, buildings, etc., and can solve problems such as long time-consuming

Active Publication Date: 2021-03-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using existing technology to monitor the production status of coalbed methane wells requires multiple tests of coal powder content in the output fluid of coalbed methane wells, and each test takes 1-3 days, which takes a long time

Method used

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  • A method for monitoring coal powder content in coalbed methane well output fluid
  • A method for monitoring coal powder content in coalbed methane well output fluid
  • A method for monitoring coal powder content in coalbed methane well output fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, the Xiadian block in the south of the Qinshui Basin is taken as the target area, and the content of coal powder in the output fluid of the coalbed methane well in the target area is monitored. The specific method is as follows:

[0064] Step 1. Obtain coal rock samples with various physical parameters in the target area, including high-rank coal, middle-rank coal, and low-rank coal.

[0065] Step 2. By testing the coal rock sample and the density of coal powder in the output fluid of the coalbed methane well, it is determined that the two coals are high-rank coal, and the high-rank coal rock is ground into a 150-mesh coal powder sample.

[0066] Step 3. Obtain a blank formation fluid without pulverized coal in the target area, and prepare the pulverized coal sample with a mass concentration of 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% respectively. , 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2 %, 2.3%, ...

Embodiment 2

[0081] In this embodiment, the Zhengzhuang block in the south of Qinshui Basin is taken as the target area, and the content of pulverized coal in the output fluid of coalbed methane wells in the target area is monitored. The specific method is basically the same as that provided in Example 1, except that : In step 2, the high-rank coal rock is ground into a 180-mesh pulverized coal sample, and in step 3, the blank formation fluid and the pulverized coal sample are prepared into a pulverized coal sample with a mass concentration of 0.2%, 0.4%, 0.6%, respectively. 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, 3.2%, 3.4%, 3.6%, 3.8%, 4.0% 20 standard colorimetric solutions, the mathematical relationship in step 5 is: y=72.261x+12.362.

[0082] Repeat the above steps to obtain the content of pulverized coal in the output fluid of different coalbed methane wells to be monitored every 30 minutes. A total of 9 sets of data are obtained. The specific data are...

Embodiment 3

[0090] In this embodiment, the Fanzhuang block in the south of the Qinshui Basin is taken as the target area, and the coal powder content in the output fluid of the coalbed methane well in the target area is monitored. The specific method is basically the same as that provided in Example 1, except that : In step 2, the high-rank coal rock is ground into a 200-mesh pulverized coal sample, and in step 3, the blank formation fluid and the pulverized coal sample are prepared into a pulverized coal sample with a mass concentration of 0.1%, 0.2%, 0.4%, respectively. 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, 3.3%, 3.6%, 3.8%, 4.0% 20 standard colorimetric solutions, the mathematical relationship in step 5 is: y=72.442x+13.952

[0091] Repeat the above steps to obtain the coal powder content in the output fluid of different coalbed methane wells to be monitored every 30 minutes, and obtain 9 sets of data in total. The specific data are shown in Tabl...

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Abstract

The invention discloses a method for monitoring the coal powder content in the output liquid of a coalbed gas well, belonging to the technical field of coalbed gas well exploitation. The method includes: obtaining coal rock samples with various physical parameters in the target area; determining the coal rock samples consistent with the physical parameters of the coal powder in the output fluid of the coalbed methane well to be monitored as the sample to be tested, and grinding them into coal powder sample; obtain a blank formation fluid without coal powder in the target area, and use the blank formation fluid and coal powder sample to prepare multiple standard colorimetric solutions with different mass concentrations of coal powder samples; measure multiple standard ratios respectively The turbidity value of the color liquid; according to the turbidity values ​​of multiple standard colorimetric liquids, the mathematical relationship between the mass concentration of pulverized coal and the turbidity value is obtained; the production fluid is obtained from the coalbed methane well to be monitored as a monitoring sample , and measure the turbidity value of the monitoring sample, and calculate the mass concentration of the monitoring sample by substituting the turbidity value of the monitoring sample into the mathematical relationship. The method is simple to operate and takes a short time.

Description

technical field [0001] The invention relates to the technical field of coal bed gas well mining, in particular to a method for monitoring the coal powder content in the coal bed gas well output liquid. Background technique [0002] CBM is mainly adsorbed on the particle surface of coal matrix, part of it is free in coal pores, and a very small part is dissolved in the liquid of coal seam. In the process of coalbed methane well mining, it is necessary to reduce the pressure of the coal reservoir by draining the liquid in the coal seam, and then exploit the coalbed methane well. However, the compressive strength and tensile strength of coal are small, and it is easy to be broken into coal powder. In addition, during the mining process of coalbed methane wells, the force of the mining equipment will easily cause the coal rock to vibrate or break to produce coal powder. Therefore, the liquid in the coal seam Contains suspended coal dust. The coal powder in the coal seam liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/08
CPCE21B49/08E21B49/0875
Inventor 樊彬李梦溪胡秋嘉窦武桑广杰乔茂坡王青川张金笑李玲玉毛崇昊
Owner PETROCHINA CO LTD
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