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Fracturing method for controlling opening of shale near-well fine natural cracks

A natural fracture and fracturing technology, which is applied in the field of fracturing to control the opening of fine natural fractures near wellbore in shale, can solve the problems of unfavorable filling, reduce liquid filtration, and cannot reach the expansion volume of artificial fractures, so as to solve the problem of filtration loss. The effect of increasing and reducing liquid filtration and large pressure window

Inactive Publication Date: 2021-01-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For shale, it is not conducive to filling and sealing natural fractures, reducing fluid loss and ensuring the expansion of artificial fractures, and cannot achieve the purpose of smooth sand addition and ensuring the expansion volume of artificial fractures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A fracturing method for controlling the opening of fine natural fractures near wellbore in shale, comprising the following steps:

[0028] a. In the stage of pre-fluid injection in the early stage of fracturing, the on-site fracturing displacement is controlled at 9m 3 / min, to make the fracturing displacement press open the reservoir and extend the artificial fracture;

[0029] b. After injecting the pre-fluid, add 10 tons of 100-mesh quartz sand with slick water to fill artificial cracks and micro-slits;

[0030] c. Increase the fracturing displacement by 1m 3 / min, continue to add 10 tons of 100 mesh quartz sand;

[0031] d. Increase to the design displacement and continue to add 10 tons of 100-mesh quartz sand;

[0032] e. Transfer to 40 mesh ceramsite and add sand until the fracturing construction is completed.

[0033] Since the opening of natural fractures is related to the net bottomhole pressure, the fracturing displacement is controlled at the initial stag...

Embodiment 2

[0035] A fracturing method for controlling the opening of fine natural fractures near wellbore in shale, comprising the following steps:

[0036] a. In the stage of pre-fluid injection in the early stage of fracturing, the on-site fracturing displacement is controlled at 9.5m 3 / min, to make the fracturing displacement press open the reservoir and extend the artificial fracture;

[0037] b. After injecting the pre-fluid, add 12 tons of 100-mesh quartz sand with slick water to fill artificial cracks and micro-slits;

[0038] c. Increase the fracturing displacement by 1.5m 3 / min, continue to add 12 tons of 100 mesh quartz sand;

[0039] d. Increase to the design displacement and continue to add 12 tons of 100-mesh quartz sand;

[0040] e. Transfer to 50 mesh ceramsite and add sand until the fracturing construction is completed.

Embodiment 3

[0042] A fracturing method for controlling the opening of fine natural fractures near wellbore in shale, comprising the following steps:

[0043] a. In the stage of pre-fluid injection in the early stage of fracturing, the on-site fracturing displacement is controlled at 9.5m 3 / min, to make the fracturing displacement press open the reservoir and extend the artificial fracture;

[0044] b. After injecting the pre-fluid, add 13 tons of 100-mesh quartz sand with slick water to fill artificial cracks and micro-slits;

[0045] c. Increase the fracturing displacement by 1.5m 3 / min, continue to add 15 tons of 100 mesh quartz sand;

[0046] d. Increase to the design displacement and continue to add 13 tons of 100-mesh quartz sand;

[0047] e. Transfer to 60-mesh ceramsite and add sand until the fracturing construction is completed.

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Abstract

The invention discloses a fracturing method for controlling the opening of shale near-well fine natural cracks, and belongs to the technical field of oil and gas field development. The method is characterized by comprising the following steps of a, controlling the on-site fracturing displacement to be 9-10m<3> / min in a prepad fluid injection stage at the initial stage of fracturing, and enabling the fracturing displacement to open a reservoir and an artificial crack to extend; b, after prepad fluid is injected, adding 10-15 tons of 100-mesh quartz sand into slickwater to fill the artificial crack and micro cracks; c, increasing the fracturing displacement by 1-2m<3> / min, and continuously adding 10-20 tons of 100-mesh quartz sand; d, increasing the displacement to a designed displacement, and continuously adding more than 10 tons of 100-mesh quartz sand; and e, transferring in 40-70-mesh ceramsite and sand until fracturing construction is finished. The fracturing method \is beneficial to filling and plugging the natural cracks, reducing liquid filtration loss, ensuring the expansion degree of artificial cracks and achieving the purposes of smoothly adding sand and ensuring the expansion volume of the artificial cracks.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a fracturing method for controlling the opening of fine natural fractures near wells in shale. Background technique [0002] In recent years, the scale of domestic shale oil and gas exploration and development has increased year by year, and the number of fracturing wells in shale reservoirs has also increased year by year. Domestic shale oil and gas fracturing technology has also made considerable progress. There are also some technical difficulties. In the process of shale fracturing, fine natural fractures are developed near the wellbore in individual intervals, and the fluid loss is larger than that of reservoirs without fractures, and the fracture width is relatively narrow, which makes it difficult for proppant to enter, and sand plugging will occur in severe cases. Therefore, in order to ensure the smooth progress of fracturing and sand addition para...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/261E21B43/267
Inventor 齐天俊王瑜周文高朱炬辉王素兵尹丛彬耿周梅
Owner BC P INC CHINA NAT PETROLEUM CORP
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