Tight reservoir volume fracturing compressibility evaluation method

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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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 performance evaluation method realizes the quantitative evaluation of the volumetric fracturing fracturability of tight reservoirs, and solves the problems in the prior art that the determination of the weight is too subjective and the parameters are not considered comprehensively.

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