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High-frequency variable displacement volume fracturing method for atmospheric pressure shale gas reservoir

A technology for shale gas reservoirs and volume fracturing, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of reducing the complexity of fracturing fractures, low production and production, low production, and fast decline rate.

Active Publication Date: 2019-05-14
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

Method used

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  • High-frequency variable displacement volume fracturing method for atmospheric pressure shale gas reservoir

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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 of 1295m. The optimized design is carried out by the method provided by the present invention, and the steps and results are as follows:

[0084] (1) The evaluation of key shale reservoir parameters believes that the well has developed high-quality shale, with good static indicators, moderately high brittleness, and high-angle natural fractures in some sections.

[0085] (2) Determine the dual dessert area for geological desserts and engineering desserts (comprehensive desserts> 0.5) As the perforation cluster position.

[0086] (3) Establish a gas reservoir numerical simulation model, and use the orthogonal scheme to design the simulation scheme. The fracturing parameters for the long-term production after obtaining the optimal fracturing are as follows: fracturing 18 segments, the optimal fracture spacing of the main fractures is 14-22m, and the fracture ha...

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Abstract

The invention discloses a high-frequency variable displacement volume fracturing method for an atmospheric pressure shale gas reservoir. The method comprises the steps of (1) evaluation of shale key reservoir parameters, (2) optimization of crack parameters, (3) determination of geological engineering filling points and determination of cluster perforation positions, (4) optimization of fracturingconstruction parameters, (5) cluster perforation operation, (6) acid pretreatment operation, (7) injection construction of acid slick water for making main cracks, (8) neutral slick water high-displacement injection construction (9) 140-230 mesh or 70-140 mesh proppant middle-displacement injection construction (10) low-displacement injection construction of sealing liquid; (11) repeating of thesteps (8)-(10) until the total liquid amount and the proppant of a current section are used up; and (12) displacement operation. According to the invention, an acidic slick water system and a neutralslick water high-frequency variable displacement process are adopted. The production effect of the atmospheric pressure shale gas well after fracturing is improved, and the aim of economically and effectively developing the atmospheric pressure shale is better achieved.

Description

Technical field [0001] The invention relates to the field of petroleum exploitation, and more specifically, to a high-frequency variable displacement volume fracturing method for atmospheric shale gas reservoirs. Background technique [0002] The resources of atmospheric shale gas reserves are huge. The area of ​​Silurian shale with a buried depth of less than 3500m in the Sichuan Basin and its periphery is 82,000 square kilometers, of which atmospheric shale covers an area of ​​62,000 square kilometers and has a geological resource of 198,000. Billion square meters, accounting for 75.6%. However, restricted by its special geological characteristics, the stable daily output of atmospheric shale gas horizontal wells after hydraulic fracturing measures is generally less than 30,000 m3, the output is relatively low and the rate of decline is relatively fast. Therefore, the current large-scale multi-stage fracturing technology has poor adaptability to atmospheric shale, and it is di...

Claims

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Application Information

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Patent Type & Authority Applications(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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