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A method for determining the scale of hydraulic fracturing fluid in coalbed methane vertical wells

A technology for hydraulic fracturing and coalbed methane wells, which is applied in the directions of instrumentation, design optimization/simulation, calculation, etc., which can solve the problem of inappropriate scale of fracturing fluid, fluid migration that affects reservoir conductivity, and smooth flowback of injected fluid without consideration. problems such as coming out, so as to avoid the mismatch of geological conditions

Active Publication Date: 2022-04-01
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually, the method of numerical simulation does not consider whether the injected liquid can be smoothly discharged after fracture creation, whether it will cause damage to the reservoir, especially the impact on the migration of fluid in the reservoir. After all, coalbed methane is drainage and depressurization gas recovery , the ultimate goal is not just to create fractures, but to allow the fluid in the coal seam to be extracted smoothly
Therefore, it is not that the larger the fracturing scale, the better the effect of fracturing stimulation. When the injection of too much fracturing fluid may cause too much foreign fluid, it will cause water lock, hydration expansion, and reservoir pressure increase. Large and other negative effects, affecting the conductivity of the reservoir and the migration of fluids
This has led to a large number of low-efficiency wells caused by the mismatch between the fracturing fluid scale and the geological conditions of the coal reservoir due to the inappropriate scale of fracturing fluid in the actual CBM development process. A new approach to cracking fluid scale

Method used

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  • A method for determining the scale of hydraulic fracturing fluid in coalbed methane vertical wells
  • A method for determining the scale of hydraulic fracturing fluid in coalbed methane vertical wells
  • A method for determining the scale of hydraulic fracturing fluid in coalbed methane vertical wells

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Example 1: Analysis of production data of certain blocks in the south of Qinshui Basin

[0048] Step 1: Data Acquisition

[0049] The southern part of the Qinshui Basin is a typical region where high coal-rank coalbed methane has been successfully commercially developed in my country. A large number of coalbed methane wells have been put into production in this basin. Coalbed methane development generally implements rolling development, and collects production data of coalbed methane wells that have been put into production in adjacent blocks to be developed, including critical desorption pressure, reservoir pressure, temporary storage ratio, fracturing fluid volume, peak gas production of coalbed methane wells, etc.

[0050] Step 2: Data Processing

[0051] Screen, collate and convert the collected critical desorption pressure, reservoir pressure, temporary storage ratio, fracturing fluid volume, and peak gas production of coalbed methane wells to create high-quality ...

Embodiment 2

[0084] Example 2: Examples of different fracturing scales for two development well groups in a development unit in a block in the southern Qinshui Basin

[0085] Two adjacent development well groups (well group 1 and well group 2) in a certain development unit in the study area were developed with different fracturing scales. The data of existing production wells near the well group showed that the temporary-storage ratio was 0.39-0.6, and the average temporary-storage ratio was 0.39-0.6. than 0.49.

[0086] A total of 9 wells were fractured in Well Group 1. Using conventional numerical simulation methods and experience, the fracturing fluid consumption in this area was designed to be 700 cubic meters. The actual fracturing fluid consumption was 715.3 to 728.5 cubic meters. From 458 to 1868 cubic meters, the average peak gas production is 854 cubic meters.

[0087] A total of 5 wells were fractured in well group 2. Using the method for determining the scale of fracturing flui...

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Abstract

The invention provides a method for determining the scale of coalbed methane vertical well hydraulic fracturing fracturing fluid, comprising the following steps: step 1: data collection; step 2: data processing; step 3: single factor analysis of variance; step 4: multifactor analysis of variance ; Step 5: Design of fracturing fluid dosage. The beneficial effect of the present invention is: the method utilizes the production data of the developed wells, and combines the actual geological conditions of the reservoir and the gas production rate corresponding to the fracturing fluid scale, which can more truly and accurately reflect the more favorable conditions under the geological conditions. The hydraulic fracturing fluid scale of gas production provides a theoretical basis for the design of pump injection parameters. Compared with the existing hydraulic fracturing numerical simulation technology to determine the scale of fracturing fluid, it is more realistic and effective, and avoids the mismatch between the scale of fracturing fluid and geological conditions and the negative effects caused by excessive fracturing fluid.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane development, and in particular relates to a method for determining the scale of hydraulic fracturing fracturing fluid in vertical coalbed methane wells. Background technique [0002] Hydraulic fracturing is the main technical method for the development and stimulation of coalbed methane vertical wells. The purpose of hydraulic fracturing is to form efficient diversion fractures and improve the permeability of coal seams. The scale of hydraulic fracturing is related to the amount of fracturing fluid and the amount of fracturing sand. The larger the fracturing scale, the more fracturing fluid and supporting sand will be injected. It is generally believed that the larger the fracturing scale, the fracture will expand to varying degrees in the three-dimensional directions of length, width and height, especially in the direction of length extension. [0003] Fracturing fluid scale is one of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F111/08G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2111/08G06F2119/14
Inventor 陈文文王小明李瑞党正涂明恺朱冲
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)