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Horizontal well fracturing method for promoting fracture height extension through two times of acid injection and inter-cluster temporary plugging

A horizontal well and acid injection technology, applied in the field of horizontal well fracturing, can solve the problem of limited fracture height

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the height of the fractures is limited in the existing staged multi-cluster fracturing of the horizontal well, the present invention proposes a new fracturing method for increasing the height of the fractures in the staged multi-cluster fracturing of the horizontal well. The cluster fractures expand evenly in the vertical direction, thereby increasing the degree of reservoir production in the vertical direction, increasing the effective stimulation volume, improving the efficiency of reservoir stimulation, and finally realizing the efficient development of shale gas reservoirs

Method used

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  • Horizontal well fracturing method for promoting fracture height extension through two times of acid injection and inter-cluster temporary plugging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A shale gas well in southwestern Sichuan has a vertical depth of 2200m, a sounding depth of 4385m, and a horizontal section length of 1585m. Follow the steps below to retrofit:

[0074] (1) Coiled tubing is used to carry a perforating gun to complete the first stage of perforating operation. Among them, perforating guns are arranged according to 3 perforations in each plane, the number of perforation clusters is 6 clusters, and there are 18 perforation holes in total.

[0075] (2) After the first section of perforation operation, 1m 3 A total of 30m of pretreatment acid is injected per minute 3 . then at 4m 3 / min displacement into low-viscosity slippery water 16m 3 For acid. Subsequent increase in displacement to 6m 3 / min inject low viscosity slippery water 16m 3 Replace the acid, and finally increase the displacement to 8m 3 / min inject low viscosity slippery water 18m 3 replace the acid to ensure that the acid can enter all perforation clusters.

[0076] ...

Embodiment 2

[0097] A shale gas well in southwestern Sichuan has a vertical depth of 2600m, a sounding depth of 4886m, and a horizontal section length of 1585m. Follow the steps below to retrofit:

[0098] (1) Coiled tubing is used to carry a perforating gun to complete the first stage of perforating operation. Among them, perforating guns are arranged according to 3 perforations in each plane, the number of perforation clusters is 6 clusters, and there are 18 perforation holes in total.

[0099] (2) After the first section of perforation operation, with 1.5m 3 A total of 30m of pretreatment acid is injected per minute 3 . then at 4m 3 / min displacement into low-viscosity slippery water 16m 3 For acid. Subsequent increase in displacement to 6m 3 / min inject low viscosity slippery water 16m 3 Replace the acid, and finally increase the displacement to 8m 3 / min inject low viscosity slippery water 18m 3 replace the acid to ensure that the acid can enter all perforation clusters.

...

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Abstract

The invention discloses a horizontal well fracturing method for promoting fracture height extension through two times of acid injection and inter-cluster temporary plugging. The horizontal well fracturing method comprises the following steps that planar flow-limiting perforation operation is conducted; variable-displacement acid pretreatment operation is conducted; a main fracture is built by adopting a high-viscosity glue solution, and the fracture is expanded by adopting low-viscosity slickwater; fracturing fluid carrying calcium carbonate particles is injected; fracturing fluid carrying theacid-resistant hollow temporary plugging ball is injected; low-viscosity slickwater is injected; acid liquor is injected to dissolve the calcium carbonate particles; the fracturing fluid is continuously injected; displacement operation is conducted; a bridge plug is lowered; and the steps are repeated until all sections are constructed, and plug drilling, flowback, testing and production solvingafter fracturing are conducted. According to the horizontal well fracturing method, planar flow-limiting perforation, calcium carbonate particle temporary plugging and acid-resistant hollow temporaryplugging ball temporary plugging processes are adopted, the single-cluster displacement is increased, the extension length of fractures in the height direction is effectively increased, uniform fracture initiation and extension of multiple clusters of fractures are promoted, finally, the longitudinal use degree of a shale gas reservoir is finally increased, the reservoir transformation size is increased, and finally, the efficient development of the shale gas reservoir is realized.

Description

technical field [0001] The present invention relates to the field of oilfield development, in particular to the segmented multi-cluster fracturing technology for horizontal wells, in particular to an effective reservoir stimulation method suitable for unconventional oil and gas reservoirs such as shale oil and gas, coalbed methane, and tight oil and gas, and in particular to A fracturing method for horizontal wells that promotes fracture height extension through two acid injections and inter-cluster temporary plugging. 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 o...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B43/27E21B43/116E21B43/1185E21B33/12C09K8/80
CPCE21B43/267E21B43/26E21B43/116E21B43/1185E21B33/12C09K8/80
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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