A high-sand-liquid-ratio volume fracturing method using nano-proppant for deep shale gas

A volume fracturing and proppant technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of incomplete filling of fractures and low complexity of fracture creation, and achieve clear steps and improved complexity. , The effect of improving filling efficiency

Active Publication Date: 2021-07-20
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems in the prior art of deep shale gas volume fracturing with low complexity and insufficient fracture filling, the present invention provides a volume fracturing method for deep shale gas with nano-proppant and high sand-liquid ratio. By selecting a proppant with a particle size of 200-2000 nanometers and pumping under high sand ratio conditions, the support efficiency of branch fractures and micro-fractures can be improved, the static pressure in the main fractures can be increased, and the complexity of fractures in deep shale gas fracturing can be improved. and the purpose of effectively transforming the volume

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A deep shale gas well A,

[0062] (1) Evaluation of key reservoir parameters

[0063] Including lithology and mineral composition and sensitivity evaluation, physical properties, rock mechanics and elastic-plastic deformation characteristics, three-dimensional in-situ stress and bedding fracture / texture fracture and natural fracture characteristics.

[0064] (2) Determination of segment cluster position

[0065] On the basis of step (1), the evaluation of geological sweet spot and engineering sweet spot is carried out, and the positions of geological and engineering double sweet spots are prioritized as the candidate positions of segment clusters.

[0066] (3) Optimization of crack parameters and construction parameters

[0067] Based on the evaluation results of step (1), establish a geological model, apply the commercial software ECLIPSE for shale gas fracturing production prediction, set different fracture lengths, fracture conductivity, fracture spacing, and fract...

Embodiment 2

[0084] A deep shale gas well B:

[0085] (1) Evaluation of key reservoir parameters

[0086] Including lithology and mineral composition and sensitivity evaluation, physical properties, rock mechanics and elastic-plastic deformation characteristics, three-dimensional in-situ stress and bedding fracture / texture fracture and natural fracture characteristics.

[0087] (2) Determination of segment cluster position

[0088] On the basis of step (1), the evaluation of geological sweet spot and engineering sweet spot is carried out, and the positions of geological and engineering double sweet spots are prioritized as the candidate positions of segment clusters.

[0089] (3) Optimization of crack parameters and construction parameters

[0090] Based on the evaluation results of step (1), establish a geological model, apply the commercial software ECLIPSE for shale gas fracturing production prediction, set different fracture lengths, fracture conductivity, fracture spacing, and fract...

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Abstract

The invention discloses a high-sand-liquid-volume fracturing method for deep-layer shale gas using a nano proppant. Including: (1) Evaluation of key reservoir parameters (2) Determination of section cluster position (3) Optimization of fracture parameters and construction parameters (4) Cluster perforation operation (5) Acid pretreatment operation (6) Low-viscosity slick water fracture creation Construction (7) nano-scale proppant injection construction (8) high-viscosity glue joint creation and sand addition (9) displacement operation. The present invention selects a proppant with a particle size of 200-2000 nanometers and pumps it under the condition of high sand ratio, thereby improving the propping efficiency of branch fractures and micro-fractures, increasing the static pressure in the main fractures, and improving the performance of deep shale gas fracturing fractures. Sophistication and the purpose of effectively transforming volumes.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, and more particularly relates to a method for fracturing with nano-proppant and high sand-liquid ratio volume for deep shale gas. Background technique [0002] At present, deep shale gas fracturing has entered a critical period. If the initial production and production decline after fracturing cannot meet the requirements of commercial development, the investment may be greatly reduced. Then, a large amount of deep shale gas resources may last for a long time. time cannot be effectively used. [0003] From a technical point of view, most of the current deep shale gas fracturing technologies refer to the models and parameters of shallow and medium shale gas fracturing technologies. Therefore, the adaptability and effect of fracturing technologies need to be further improved. [0004] As the depth increases, the wellbore friction increases, the construction displacement decreases, the fract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 蒋廷学侯磊路保平贾文峰卫然李洪春李奎为周林波
Owner CHINA PETROLEUM & CHEM CORP
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