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A high frequency variable displacement volumetric fracturing method for atmospheric shale gas reservoirs

A shale gas reservoir, volumetric fracturing technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of fast decline rate, low production, low production and low production due to the complexity of fracturing fractures , to achieve the effects of reasonable design, strong site operability and improved development potential

Active Publication Date: 2021-05-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, due to its special geological characteristics, the stable daily production of normal pressure shale gas horizontal wells after hydraulic fracturing is generally less than 30,000 cubic meters, and the production is relatively low and the decline rate is fast.
[0005] The above-mentioned mismatch of geological characteristics and fracturing techniques has resulted in a reduction in the complexity of fracturing fractures in normal-pressure shale gas wells, as well as low production and rapid production decline after fracturing. Therefore, it is necessary to study and propose a new method for normal-pressure shale gas wells The new technology of horizontal well volume fracturing based on gas reservoir characteristics can solve the above limitations and truly realize the economical and effective development of normal pressure shale gas

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  • A high frequency variable displacement volumetric fracturing method for atmospheric shale gas reservoirs

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Embodiment

[0083] A well in an atmospheric shale block has a vertical depth of 3876m, a sounding depth of 4932m, and a horizontal section length of 1295m. Carry out optimal design by the method provided by the present invention, step and result are as follows:

[0084] (1) According to the evaluation of key shale reservoir parameters, the well develops high-quality shale with good static indicators, medium-to-high brittleness, and high-angle natural fractures in some intervals.

[0085] (2) Determine the double-sweet spot area (comprehensive sweet spot>0.5) of geological sweet spot and engineering sweet spot as the location of perforation cluster.

[0086] (3) Establish a gas reservoir numerical simulation model, adopt an orthogonal scheme to design the simulation scheme, and obtain the fracturing parameters for optimal long-term production after fracturing are as follows: fracturing 18 stages, optimal fracture spacing of main fractures 14-22m, and half-length fractures 260-300m, with a...

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Abstract

The invention discloses a high-frequency variable displacement volume fracturing method for normal-pressure shale gas reservoirs. Including: (1) Evaluation of key shale reservoir parameters (2) Optimization of fracture parameters (3) Determination of geological engineering sweet spot and cluster perforation location (4) Optimization of fracturing construction parameters (5) Cluster perforation operation ( 6) Acid pretreatment (7) Acidic slick water injection into main fractures (8) Neutral slick water high displacement injection construction (9) Medium displacement injection construction of 140-230 mesh or 70-140 mesh proppant (10 ) Low displacement injection of spacer fluid for construction (11) Repeat steps 8) to 10) until the total fluid volume and proppant amount of the current section are used up; (12) Replacement operation. The invention adopts the acid slick water system and the neutral slick water high-frequency variable displacement process. Improve the post-pressure production effect of atmospheric shale gas wells, and better realize the goal of economically and effectively developing atmospheric shale.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, and more specifically, relates to a high-frequency variable-displacement volume fracturing method for normal-pressure shale gas reservoirs. Background technique [0002] Atmospheric shale gas resources are huge. The Silurian shale with a buried depth of less than 3,500m in the Sichuan Basin and its surrounding areas has a distribution area of ​​82,000 square kilometers, of which the normal pressure shale area is 62,000 square kilometers, and the geological resources are 198,000 square kilometers. Yifang, accounting for 75.6%. However, restricted by its special geological characteristics, the stable daily output of normal pressure shale gas horizontal wells after hydraulic fracturing is generally less than 30,000 m3, and the output is relatively low and the decline rate is fast. Therefore, the current large-scale multi-stage fracturing technology has poor adaptability to normal pressure shal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B43/267E21B49/00
Inventor 蒋廷学路保平卞晓冰王海涛李双明卫然苏瑗肖博左罗周珺
Owner CHINA PETROLEUM & CHEM CORP
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