Tight reservoir volume fracturing compressibility evaluation method

A technology for tight reservoirs and volume fracturing, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of excessive subjectivity in the determination of weights and incomplete consideration of parameters, so as to solve the subjectivity of determination. Too large, the effect of solving parameters is not fully considered

Active Publication Date: 2018-10-19
PETROCHINA CO LTD
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Problems solved by technology

[0006] In view of this, the present invention provides a compact reservoir volume fracturing fracturing method based on Young's modulus, shear modulus, tensile strength, compressive strength, rock type I fracture toughness, rock type II fracture toughness and brittleness index. The

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  • Tight reservoir volume fracturing compressibility evaluation method
  • Tight reservoir volume fracturing compressibility evaluation method
  • Tight reservoir volume fracturing compressibility evaluation method

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Embodiment Construction

[0047] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meaning as commonly understood by those skilled in the art. Before describing the embodiments of the present invention in further detail, definitions are given for some terms for understanding the embodiments of the present invention.

[0048] 1. Brittleness index

[0049] The brittleness index can be expressed as the ratio of quartz content to the sum of quartz content and clay mineral content and carbonate mineral content. Rock brittleness is one of the most important factors affecting the formation of multiple fractures, and its size has a great influence on the shape of the induced fractures produced by fracturing. Plastic reservoirs with high shale content are prone to plastic deformation during fracturing, forming simple fractures, while brittle reservoirs have high content of brittle minerals such as quartz, and complex fracture networks are easy to form ...

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Abstract

The invention discloses a tight reservoir volume fracturing compressibility evaluation method and belongs to the field of oil-gas field development technology. According to the tight reservoir volumefracturing compressibility evaluation method, the Young modulus, shear modulus, tensile strength, compressive strength, rock I-type fracture toughness, rock II-type fracture toughness and brittlenessindexes of each point location in a target tight reservoir three-dimensional space obtained after normalization are substituted into different catastrophic models, brittleness parameters, elasticity parameters and strength parameters are obtained through calculation, then the brittleness parameters, the elasticity parameters and the strength parameters are utilized to construct a volume fracturingcompressibility evaluation model, a volume fracturing compressibility coefficient of each point location in the target tight reservoir three-dimensional space is obtained through calculation, and three-dimensional spatial distribution of compressibility indexes of a target tight reservoir is acquired to determine compressible layer sections of the target tight reservoir. Therefore, quantitative evaluation of tight reservoir volume fracturing compressibility is realized, and the problems that in the prior art, the subjectivity of weight determination is excessively high, and parameters are notconsidered comprehensively are solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for evaluating the compressibility of tight reservoir volume fracturing. Background technique [0002] Tight reservoirs usually refer to reservoirs with low reservoir permeability, including tight sandstone, shale, etc. However, volume fracturing mainly uses certain means to divert and dislocate artificial fractures, generate a large number of secondary fractures, and form a large-scale complex fracture network in the entire stimulation range, effectively connecting the reservoir and the wellbore to achieve the purpose of stimulation. Volume fracturing of tight reservoirs is also to realize the stimulation of tight reservoirs. [0003] In the prior art, there are various methods for evaluating the compressibility of tight reservoir volume fracturing. Among them, Yuan Junliang et al. established a volume fracturing fractability evaluation method fo...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 吴天鹏李武广张德良谢维扬田冲赵圣贤刘军朱怡晖高攀陈玉龙
Owner PETROCHINA CO LTD
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