Method for optimizing tight oil horizontal well crack network parameters through transformation volume

Abstract

The invention discloses a method for optimizing tight oil horizontal well crack network parameters through the transformation volume, and belongs to the field of tight oil horizontal well reservoirs. According to the method, according to a tight reservoir, firstly, the geologic feature of the reservoir is evaluated, the specific reservoir condition for volume fracture to form a volume crack network system is explicated, then, the influences of different transformation volumes and crack arrangement modes of horizontal well volume fracture on capacity are studied, and the specific crack network parameters are optimized. The method at least includes the steps that firstly, a basic crack network feature comprehensive evaluation method for tight reservoir volume fracture is established; secondly, a capacity prediction and simulation model method for tight oil volume fracture is established. The tight oil layer horizontal well fracture crack network parameters are optimized through the transformation volume formed in the fracture process, the transformation volume is formed in a tight oil layer, a matrix seeps towards a crack at the shortest distance, the driving pressure of effective flow is greatly reduced, and flow under the extremely-low permeability condition is achieved; the single well capacity can be greatly improved.

Description

technical field [0001] The invention relates to the field of tight oil horizontal well reservoirs, in particular to a method for optimizing the fracture network parameters of tight oil horizontal wells by using the modified volume. Background technique [0002] Tight oil is the abbreviation of tight reservoir oil, which is a kind of unconventional oil resource, and its main storage space is tight sandstone, marl, dolomite and other unconventional reservoirs. These unconventional reservoirs are characterized by small porosity and low permeability, and generally have no or low natural production capacity, making exploration and development difficult. [0003] During the development of tight oil and gas reservoirs, due to the decrease of pore pressure, the effective stress increases, and the pores and fractures of the reservoir rock are deformed and the permeability is affected. Tight oil reservoirs are characterized by tight reservoirs, fine pore throats, strong reservoir het...

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Problems solved by technology

[0005] However, for oil in tight reservoirs, due to the development of natural fractures in the reservoir, the tightness of the reservoir, and the complex seepage characteristics, it is not suitable to adopt the traditional method of optimizing hydraulic fractures in low-permeability reservoirs. It is difficult to realize the economical and effective development of tight oil due to the small increase in single well production of flat wells

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