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A horizontal well fracturing method that promotes high fracture extension through two acid injections 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 height of fracturing fractures, and achieve the effects of increasing construction displacement, increasing production length, and efficient development

Active Publication Date: 2022-07-05
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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  • A horizontal well fracturing method that promotes high fracture extension through two acid injections 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 these steps to retrofit:

[0074] (1) Use coiled tubing to carry perforating guns to complete the first stage of perforating operations. Among them, the perforating guns are arranged with 3 holes in each plane, the number of perforation clusters is 6 clusters, and there are 18 perforation holes in total.

[0075] (2) After the first stage of perforating operation, take 1m 3 A total of 30m of pretreatment acid is injected at the displacement of / min 3 . Then take 4m 3 Displacement / min injected into low viscosity slick water 16m 3 acid. The displacement was subsequently increased to 6m 3 / min inject low viscosity slick water 16m 3 Replace the acid, and finally increase the displacement to 8m 3 Inject 18m of low-viscosity slick water / min 3 Replace the acid to ensure that the acid can enter all perforation clusters.

...

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 these steps to retrofit:

[0098] (1) Use coiled tubing to carry perforating guns to complete the first stage of perforating operations. Among them, the perforating guns are arranged with 3 holes in each plane, the number of perforation clusters is 6 clusters, and there are 18 perforation holes in total.

[0099] (2) After the first stage of perforating operation, use 1.5m 3 A total of 30m of pretreatment acid is injected at the displacement of / min 3 . Then take 4m 3 Displacement / min injected into low viscosity slick water 16m 3 acid. The displacement was subsequently increased to 6m 3 / min inject low viscosity slick water 16m 3 Replace the acid, and finally increase the displacement to 8m 3 Inject 18m of low-viscosity slick water / min 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 high fracture extension through two acid injections and inter-cluster temporary plugging. The main fracture is created with liquid and the low-viscosity slick water is used to expand the fracture; the fracturing fluid carrying calcium carbonate particles is injected; the fracturing fluid carrying the acid-resistant hollow temporary plugging ball is injected; the low-viscosity slick water is injected; the acid solution is injected to dissolve the calcium carbonate particles; Continue to inject fracturing fluid; replace operation; lower bridge plug; repeat the above until all constructions are completed, drill plug, flowback, test and production after fracturing. The method adopts the process of plane restricting perforation, temporary plugging of calcium carbonate particles, and temporary plugging of acid-resistant hollow temporary plugging balls, which increases the single-cluster displacement, effectively improves the extension length of fractures in the height direction, and promotes multi-clustering. Fractures are evenly initiated and extended, which ultimately improves the vertical production degree of shale gas reservoirs, increases the volume of reservoir stimulation, and finally realizes efficient development of shale gas reservoirs.

Description

technical field [0001] The invention relates to the field of oilfield development, in particular to a horizontal well staged multi-cluster fracturing technology, in particular to an effective reservoir stimulation method suitable for shale oil and gas, coalbed methane, tight oil and gas and other unconventional oil and gas reservoirs, in particular to A horizontal well fracturing method that promotes high fracture extension through two acid injections and temporary plugging between clusters. Background technique [0002] The potential of shale gas resources in my country is huge, and the recoverable resources are about 26×10 12 m 3 , roughly equivalent to that of the United States. The resources of Cambrian and Silurian shale in the Sichuan Basin alone are equivalent to 1.5 to 2.5 times that of conventional natural gas resources in the basin. However, shale gas reservoirs have low porosity and low permeability, and industrial gas flow can only be obtained through hydrauli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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