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A deep shale gas reservoir stimulation method and its application

A technology for shale gas reservoirs and deep layers, which is applied in the field of stimulation of deep shale gas reservoirs, can solve the problems of less sand addition, low sand-to-liquid ratio, and high fracturing pressure in deep shale gas construction, so as to improve complexity and development. degree of effect

Active Publication Date: 2020-02-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] According to the deficiencies in the prior art, the present invention provides a method for increasing the production of deep shale gas reservoirs, using the method to effectively transform the fracture volume of deep shale gas, and solve the problem of high fracture pressure and sand addition in deep shale gas construction. The problems of low sand-liquid ratio and low sand-liquid ratio have significantly improved the production of deep shale gas wells

Method used

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  • A deep shale gas reservoir stimulation method and its application
  • A deep shale gas reservoir stimulation method and its application
  • A deep shale gas reservoir stimulation method and its application

Examples

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Embodiment 1

[0047] A well in southwestern Sichuan has a vertical depth of 3298m, a measured depth of 4623m, and a horizontal section length of 1160m. After testing, it satisfies the conditions that are conducive to the formation and strengthening of cracks, and the transformation is carried out according to the following steps:

[0048] (1) Use circumferential perforation mode, 2-4 clusters of perforation, 16 holes per week;

[0049] (2) Using software numerical simulation to determine the optimal fracturing stage is 16 stages, the half-length of the fracture is 180-220m, the conductivity is 65-72mD·m, and the amount of fracturing fluid for a single stage is 1200-1500m 3 , a single-stage propping dose of 70m 3 -82m 3 ;

[0050] (3) For fracturing, use pretreatment acid solution (15% HCl + 1.5% HF + 2.0% high temperature corrosion inhibitor + 1.5% iron ion stabilizer) 20m 3 , slippery water 1000-1300m 3 , glue 150-200m 3 ;

[0051] (4) Perform pre-acid fracturing treatment, using gr...

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Abstract

The invention relates to a production increase method for a deep layer shale gas reservoir. The production increase method comprises the following steps that (1) compressibility and ground stress evaluation is conducted on a stratum; (2) cluster perforation parameters are determined, and the perforation mode is circumferential perforation; (3) after crake parameters and construction parameters are determined, fracturing is conducted on target stratum shale; (4) pre-acid-fracturing treatment is conducted, and acid fracturing adopting high mucic acid and closed acidizing treatment adopting low mucic acid are included; (5) slickwater containing a propping agent is injected, and the sand-to-liquid ratio is gradually increased to be 20% from 1%; and (6) high viscosity glue liquid containing a propping agent is injected, and the sand-to-liquid ratio is gradually increased to be 23% from 5%. A deep layer shale gas well is transformed by using the production increase method, and the productive potential of the deep layer shale gas reservoir can be increased.

Description

technical field [0001] The invention relates to a method for increasing production of shale gas reservoirs, and more particularly relates to a method for increasing production of deep shale gas reservoirs. Background technique [0002] At present, some useful explorations have been made on the volumetric fracturing technology of deep shale gas horizontal wells, mainly using technologies such as multi-section and few clusters, optimized acid formula to reduce fracture pressure, and increased proportion of high-viscosity glue and small-particle-size proppant. The countermeasures have achieved some effects in the Dingshan, Nanchuan and Fuling peripheral blocks, but there are still limitations such as low yield after compression and rapid decline in yield. [0003] From a technical point of view, deep shale gas fracturing mainly has the following problems: [0004] 1) The plasticity of the rock is strengthened, making it more difficult for cracks to initiate and extend; [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 蒋廷学曾义金卞晓冰贾长贵王海涛李双明卫然苏瑗
Owner CHINA PETROLEUM & CHEM CORP
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