A method for evaluating the compressibility of tight reservoir volume fracturing
A tight reservoir and volumetric fracturing technology, applied in data processing applications, design optimization/simulation, calculation, etc., can solve the problems of incomplete consideration of parameters, too much subjectivity of weight determination, etc., to solve the problem of incomplete consideration of parameters , Solve the effect of determining excessive subjectivity
Active Publication Date: 2021-11-02
PETROCHINA CO LTD
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[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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[0049] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. Before further describing the embodiments of the present invention in detail, some terms for understanding the embodiments of the present invention are defined.
[0050] 1. Fragility index
[0051] The brittleness index can be expressed as the ratio of quartz content to the sum of quartz content, clay mineral content, and carbonate rock 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 induced fractures produced by fracturing. Plastic reservoirs with high shale content are prone to plastic deformation and simple fractures during fracturing, while brittle reservoirs with high content of brittle minerals such as quartz are prone to form complex fracture networks during fracturing. Gener...
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The invention discloses a compact reservoir volume fracturing fracability evaluation method, which belongs to the technical field of oil and gas field development. The method for evaluating the fracability of volume fracturing of tight reservoirs adopts the Young's modulus, shear modulus, tensile strength, compressive strength, Rock type I fracture toughness, rock type II fracture toughness and brittleness index are respectively substituted into different catastrophe models to calculate brittleness parameters, elastic parameters and strength parameters, and then use the brittleness parameters, elastic parameters and strength parameters to construct volume fracturing fracability Evaluate the model, calculate the volumetric fracturing compressibility coefficient of each point in the three-dimensional space of the target tight reservoir, obtain the three-dimensional space distribution of the target tight reservoir compressibility index, and determine the compressible section of the target tight reservoir, Quantitative evaluation of the volumetric fracturing fracturability of tight reservoirs is realized, and the problems of too much subjectivity in weight determination and incomplete consideration of parameters in the prior art 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 fracability 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 methods to divert and dislocate artificial fractures, generate a large number of secondary fractures, form a large-scale complex fracture network in the entire stimulation range, effectively communicate the reservoir and the wellbore, and achieve the purpose of increasing production. The volume fracturing of tight reservoirs is also to realize the stimulation of tight reservoirs. [0003] In the prior art, there are many methods for evaluating the fracability of tight reservoir volume fracturing. Among them, Yuan Junliang et al. established a volume fracturing fracturing evaluation method ...
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IPC IPC(8): G06F30/20G06Q10/06
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