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Fracturing method for staged supporting of proppants with different particle sizes in multi-scale cracks

A proppant and multi-scale technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of uneven laying of proppant with different particle sizes, increase the effective volume of reconstruction, etc., and achieve expansion pressure The effect of cracking the spread, increasing the volume of transformation, and avoiding doping and mixing

Active Publication Date: 2021-10-22
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of uneven laying of proppants with different particle sizes in multi-scale fractures, the present invention proposes a A new fracturing method for staged propping in multi-scale fractures. This method can promote the development of multi-scale fractures, and proppants of various particle sizes can be fully migrated and efficiently laid in the fracture network, thereby increasing the effective stimulation volume and improving the shale formation rate. Reservoir stimulation efficiency of gas reservoirs, ultimately improving single well productivity

Method used

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  • Fracturing method for staged supporting of proppants with different particle sizes in multi-scale cracks

Examples

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Effect test

Embodiment 1

[0093] A shale gas well in southwestern Sichuan has a vertical depth of 2180m, a sounding depth of 3970m, and a horizontal section length of 1200m. Follow the steps below to retrofit:

[0094] (1) Analyze the fracturability, mechanical properties and fracturing quality of shale, optimize the location of engineering sweet spots and segment clusters, based on the commonly used commercial simulation software ECLIPSE for fracturing production prediction and the commonly used commercial simulation software MEYEY for fracture propagation simulation, based on The simulation optimization of the conventional process determines that the optimal fracturing stage is 19 stages, the optimal fracture half-length is 300m, and the sand volume scale of a single stage is 100m 3 , a total of 2 clusters in a single section, the perforation length of each cluster is 1.5m, the perforation density is 16 holes / m, and the fracturing construction parameters are optimized.

[0095] (2) After the first s...

Embodiment 2

[0110] A shale gas well in southwestern Sichuan has a vertical depth of 2068m, a sounding depth of 4100m, and a horizontal section length of 1360m. Follow the steps below to retrofit:

[0111] (1) Analyze the fracturability, mechanical properties and fracturing quality of shale, optimize the location of engineering sweet spots and segment clusters, based on the commonly used commercial simulation software ECLIPSE for fracturing production prediction and the commonly used commercial simulation software MEYEY for fracture propagation simulation, based on The simulation optimization of the conventional process determines that the optimal fracturing stage is 19 stages, the optimal fracture half-length is 300m, and the sand volume scale of a single stage is 100m 3 , a total of 2 clusters in a single section, the perforation length of each cluster is 1.5m, the perforation density is 16 holes / m, and the fracturing construction parameters are optimized.

[0112] (2) After the first s...

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Abstract

The invention discloses a fracturing method for staged supporting of proppants with different particle sizes in multi-scale cracks. The fracturing method comprises the following steps: 1) perforation operation is performed; 2) acid pretreatment operation is performed; (3) fracturing fluid is injected to make a main crack; (4) a blocking agent is injected to block the end of the main crack; (5) fracturing fluid is injected to make branch cracks; (6) a blocking agent is injected to block the ends of the branch cracks; (7) fracturing fluid is injected to make micro cracks; (8) low-viscosity fracturing fluid carrying a small-particle-size proppant is injected; (9) medium-viscosity fracturing fluid carrying a medium-particle-size proppant is injected;10) steps 3-9 are repeated for multiple times; (11) high-viscosity fracturing fluid carrying a large-particle-size proppant is injected; (12) displacement operation is carried out; and (13) a bridge plug is put down, and steps 1-11 are repeated until all sections are constructed. According to the method, the strategy that the large-scale main crack and the medium-scale branch cracks are temporarily blocked in sequence, and the main crack, the steering branch cracks and the micro cracks are temporarily plugged in sequence is adopted, and full extension of the main crack, the steering branch cracks and the micro cracks is promoted.

Description

technical field [0001] The invention relates to a shale gas reservoir stimulation technology, in particular to a fracturing method in which proppants with different particle sizes are propped in stages in multi-scale fractures. Background technique [0002] The potential of shale gas resources in my country is very huge, and the recoverable resources are about 26×10 12 m 3 , roughly equivalent to that of the United States. Only two sets of Cambrian and Silurian shales in the Sichuan Basin have resources equivalent to 1.5 to 2.5 times the conventional natural gas resources in the basin. However, shale gas reservoirs have low porosity and low permeability, and hydraulic fracturing operations are required to obtain industrial gas flow. Therefore, reasonable and effective hydraulic fracturing operations are of great significance to the commercial development of shale gas in my country. [0003] At present, the main technology adopted in shale gas development is the idea of ​...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/13E21B43/267E21B43/27
CPCE21B43/26E21B43/267E21B43/261
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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