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Method for achieving volume fracturing through pre-pressurization of normal-pressure shale gas and application

A technology for volume fracturing and shale gas, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., to achieve the effects of reasonable design, increased stimulation volume, and large economic benefits

Active Publication Date: 2021-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This paper mainly studies the mechanism of CO 2 The jet pressurization mechanism does not involve the specific fracturing process

Method used

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  • Method for achieving volume fracturing through pre-pressurization of normal-pressure shale gas and application

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Experimental program
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Effect test

Embodiment 1

[0067] Well A, an atmospheric shale gas well in Fuling, Chongqing, China, has a vertical depth of 2830m and a horizontal section length of 1250m. Taking the first section of the fracturing field of Well A as an example, the present invention will be further described in detail.

[0068] Step 1: Perform reservoir evaluation on Well A. Including lithology, physical properties, gas-bearing properties, rock mechanics, three-dimensional in-situ stress, development of natural fractures, etc., are evaluated by conventional logging, logging and core experiments, and used in the design of construction plans;

[0069] Step 2: Determine the location of the perforation cluster based on the evaluation of geological and engineering double sweet spots. There are 5 perforation clusters in each section, the perforation length of each cluster is about 1m, the perforation density is 20 holes / m, the phase is 60 degrees, and the perforation diameter is 9.5mm.

[0070] Step 3: Use the geological m...

Embodiment 2

[0079] Well B, an atmospheric shale gas well in Fuling, Chongqing, China, has a vertical depth of 2,800 m and a horizontal section length of 1,300 m. Taking the fracturing section 1 of well B as an example, the present invention will be further described in detail.

[0080] Step 1: Perform reservoir evaluation on Well B. Including lithology, physical properties, gas-bearing properties, rock mechanics, three-dimensional in-situ stress, development of natural fractures, etc., are evaluated by conventional logging, logging and core experiments, and used in the design of construction plans;

[0081] Step 2: Determine the location of the perforation cluster based on the evaluation of geological and engineering double sweet spots. There are 6 perforation clusters in each section, the perforation length of each cluster is about 1m, the perforation density is 16 holes / m, the phase is 60 degrees, and the perforation diameter is 9.5mm.

[0082] Step 3: Use the geological modeling softw...

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Abstract

The invention discloses a method for achieving volume fracturing through pre-pressurization of normal-pressure shale gas. According to the method, multi-cluster jet holes in a section are comprehensively adopted to increase the induction pressure, supercritical carbon dioxide and low-viscosity slickwater are injected to increase the formation pressure, a variable-viscosity variable-displacement injection process is adopted to promote complication of main fractures and branch fractures, the type of pretreatment acid is reasonably selected, and the normal-pressure shale gas reservoir is effectively transformed and the transformation volume is increased in cooperation with the process technologies such as the liquid injection amount and injection process parameter optimization. The normal-pressure shale gas fracturing transformation effect is greatly improved, the optimization result can effectively guide fracturing construction, the transformation volume is greatly increased, the construction effect is obviously improved, and therefore the maximum economic benefits are obtained.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and relates to a new technology for volumetric fracturing of normal-pressure shale gas. Background technique [0002] At present, there is a huge amount of atmospheric shale gas resources, with about 800 million cubic meters of resources in the Sichuan Basin within Sinopec's mineral rights. However, compared with high-pressure shale gas, the geological characteristics of normal-pressure shale gas are as follows: 1) It is generally located at the edge of the structure, and various structural movements are frequent. As a result, a large amount of free gas escapes, so the gas content is relatively low, and the proportion of adsorbed gas is relatively high; 2) Due to the low pressure, the original opening of various fractures is small, so the cracks open and extend during the fracturing process. The difficulty is high, resulting in insufficient development of multi-scale fractures; 3) Due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B43/27
CPCE21B43/267E21B43/26Y02P20/54
Inventor 蒋廷学肖博卞晓冰侯磊王海涛李双明卫然苏瑗左罗仲冠宇
Owner CHINA PETROLEUM & CHEM CORP
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