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Method for realizing effective support of complex cracks in fracturing and application thereof

A technology for complex fractures and fracturing, which is applied in staged multi-cluster fracturing of horizontal wells to realize the effective support of complex fractures in fracturing, and can solve the problems of limited activation range of natural fractures and achieve effective communication and plugging effects

Pending Publication Date: 2021-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problem that the activation range of natural fractures is limited during fracturing of existing shale gas wells, the present invention proposes a method for effectively supporting complex fractures by controlling the opening of natural fractures. The method guides the sand-carrying fracturing fluid to flow into the far-well branch fractures, which is conducive to the formation of complex branch fractures in the far-well area and saturated filling, reducing or even avoiding the premature opening of natural fractures near the wellbore, improving the extension ability of the main fractures, and finally increasing the Large effective retrofit volume

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  • Method for realizing effective support of complex cracks in fracturing and application thereof

Examples

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Effect test

Embodiment 1

[0070] A shale gas well in southwestern Sichuan has a vertical depth of 2180m, a sounding depth of 3980m, and a horizontal section length of 1512m. Follow the steps below to retrofit:

[0071] (1) Coiled tubing is used to carry a perforating gun to complete the first stage of perforation. Among them, the perforation length is 3m, the hole density is 16 holes / m, and there are 3 clusters in total.

[0072] (2) After the first stage of perforation operation, after the first stage of perforation operation, the 3 A total of 10m of pretreatment acid is injected per minute 3 . Subsequent increase in displacement to 6m 3 / min Inject low viscosity slippery water 45m 3 Replace the acid, and finally reduce the displacement to 2m 3 / min inject low viscosity slippery water 5m 3 Replace the acid to ensure that the acid fully reacts with the rock.

[0073] (3) Low-viscosity slick water is used to make the main joint, and the quick lifting displacement is up to 16m 3 / min, the viscos...

Embodiment 2

[0086] A shale gas well in southwestern Sichuan has a vertical depth of 2080m, a sounding depth of 4380m, and a horizontal section length of 1512m. Follow the steps below to retrofit:

[0087] (1) Coiled tubing is used to carry a perforating gun to complete the first stage of perforation. Among them, the perforation length is 3m, the hole density is 16 holes / m, and there are 3 clusters in total.

[0088] (2) After the first stage of perforation operation, after the first stage of perforation operation, the 3 A total of 10m of pretreatment acid is injected per minute 3 . Subsequent increase in displacement to 6m 3 / min Inject low viscosity slippery water 45m 3 Replace the acid, and finally reduce the displacement to 2m 3 / min inject low viscosity slippery water 5m 3 Replace the acid to ensure that the acid fully reacts with the rock.

[0089] (3) Low-viscosity slick water is used to make the main joint, and the quick lifting displacement is up to 16m 3 / min, the viscos...

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Abstract

The invention discloses a method for realizing effective support of complex cracks in fracturing and application thereof. The method comprises the following steps after a main crack is manufactured: step 1, plugging construction of a three-stage natural crack; step 2, injection of fracturing fluid carrying a small-particle-size propping agent; step 3, injection of fracturing fluid carrying a medium-particle-size propping agent; and step 4, injection of fracturing fluid carrying a large-particle-size propping agent. The method can be applied to fracturing construction. The method adopts a graded temporary plugging mode, in the extending process of the main crack, the communicated natural cracks are plugged in a graded mode by utilizing a temporary plugging agent, the influence of fracturing fluid filtration on the net pressure in the crack is avoided, so that the net pressure in the crack is guaranteed, and the situation that the extension of the main crack is terminated too early due to a large amount of fracturing fluid filtration is avoided; and finally, effective communication and plugging of the whole-crack long inner secondary crack are realized.

Description

technical field [0001] The invention belongs to the field of fracturing, and relates to a segmented multi-cluster fracturing technology for horizontal wells, in particular to a method for realizing effective support of complex fractures in fracturing and an application thereof. 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 establish a complex network of natural fractures in shale gas reservoirs to achieve commercial gas flow. It can be seen that whether an effective complex fracture network can be formed is crucial to the fracturing effect...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B33/13
CPCE21B43/26E21B43/261E21B43/267
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