Effective volume fracturing method for shale with high clay content

A technology with effective volume and high clay, applied in the fields of earth cube drilling, mining fluids, complex mathematical operations, etc., can solve the problems of low volume of reconstruction, high construction pressure, increasing the effective volume of shale with high clay content, etc.

Active Publication Date: 2020-12-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

It can improve the problems existing in the current fracturing process, such as: high construction pressure, low fracture complexity and low stimulation volume after fracturing, so as to increase the effective stimulation volume of shale with high clay content and increase the complexity of fractures

Method used

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  • Effective volume fracturing method for shale with high clay content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A continental shale gas well has a vertical depth of 4013m, a sounding depth of 5229m, and a horizontal section length of 1200m. Through coring in pilot wells and analysis of logging data, it was found that the clay content of high-quality shale sections in this well is relatively high, reaching more than 50%. In order to increase the production of single well, follow the steps below for transformation:

[0086] (1) Based on the commonly used commercial simulation software ECLIPSE for fracturing production prediction and MEYEY, a commonly used commercial simulation software for fracture growth simulation, the optimal fracturing section is determined to be 17 sections based on the conventional flow simulation optimization, and the single-stage fracturing fluid scale is 2200m 3 , the scale of single-stage sand volume is 65m 3 , a total of 4 clusters in a single section, the perforation length of each cluster is 0.75m, and the perforation density is 16 holes / m.

[0087] ...

Embodiment 2

[0101] A continental shale gas well has a vertical depth of 3908m, a sounding depth of 4213m, and a horizontal section length of 1400m. Through coring in pilot wells and analysis of logging data, it was found that the high-quality shale section of the well has a relatively high clay content of more than 60%. In order to increase the production of single well, follow the steps below for transformation:

[0102] (1) Based on the commonly used commercial simulation software ECLIPSE for fracturing production prediction and MEYEY, a commonly used commercial simulation software for fracture growth simulation, the optimal fracturing section is determined to be 17 sections based on the conventional flow simulation optimization, and the single-stage fracturing fluid scale is 2200m 3 , the scale of single-stage sand volume is 65m 3 , there are 8 clusters in a single section, the perforation length of each cluster is 0.5m, and the perforation density is 16 holes / m.

[0103] (2) After t...

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Abstract

The invention discloses an effective volume fracturing method for shale with high clay content. The effective volume fracturing method comprises the following steps that (1) compressibility, mechanical properties and fracturing quality of the shale are analyzed; (2) fracture morphological parameters and fracturing construction parameters are optimally designed; (3) perforation operation is carriedout on a first section; (4) acid treatment is carried out; (5) a main crack is formed by adopting a high-viscosity glue solution; (6) low-viscosity slickwater carrying 70-140 meshes of a propping agent is injected; (7) inter-crack temporary plugging construction is carried out by adopting the high-viscosity glue solution in cooperation with a temporary plugging agent; (8) a medium-viscosity gluesolution carrying 40-70 meshes of the propping agent is injected; (9) the high-viscosity glue solution carrying 30-50 meshes of the propping agent of is injected; (10) inter-cluster temporary pluggingconstruction is carried out by adopting the high-viscosity glue solution in cooperation with temporary plugging balls; and (11) displacement construction is carried out. According to the effective volume fracturing method for the shale with high clay content, the problems existing in an existing fracturing process can be solved, so that the effective transformation volume of the shale with high clay content is increased, and the crack complexity is improved.

Description

technical field [0001] The invention relates to the technical field of production stimulation of shale gas reservoirs, in particular to a shale effective volume fracturing method with high clay content. Background technique [0002] my country is rich in shale gas resources, but due to its low porosity and low permeability, commercial gas flow can only be obtained through volume fracturing operations. It is worth noting that the clay content of continental shale, marine-terrestrial transitional shale, and some marine shale is relatively high, and some even exceed 50%, which brings great difficulties to volume fracturing operations. This is because with the increase of clay content, the plasticity of shale increases greatly, the difficulty of shale fracture and extension increases greatly, and the difficulty of opening branch fractures also increases, which ultimately has a great impact on increasing the effective volume of stimulation. big difficulty. Therefore, how to fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/27E21B43/116E21B33/13E21B49/00G06F17/15
CPCE21B43/26E21B43/267E21B43/116E21B33/13E21B49/00G06F17/15
Inventor 蒋廷学仲冠宇王海涛李双明卞晓冰卫然苏瑗肖博左罗
Owner CHINA PETROLEUM & CHEM CORP
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