Method for calculating productivity of staged fracturing horizontal well of non-uniform shale oil reservoir

Abstract

The invention discloses a non-uniform shale oil reservoir staged fracturing horizontal well productivity calculation method. The method comprises the following steps that S1, a shale reservoir is divided into a matrix transformation area and a hydraulic fracture area, and a double-area linear flow physical model is established; S2, establishing a non-uniform permeability field based on position change; S3, establishing seepage mathematical models of the matrix transformation area and the hydraulic fracture area; S4, introducing dimensionless quantity, and simplifying the seepage mathematical model by adopting Laplace transformation; S5, solving pressure solutions of the matrix transformation area and the hydraulic fracture area; and according to the relation between the oil well constant production pressure solution and the oil well constant pressure production solution under the Laplace space, the Stehfest numerical inversion method and dimensionless definition conversion are combined, and the non-uniform shale oil reservoir staged fracturing horizontal well yield is obtained. According to the method, the heterogeneity of the oil reservoir flowing area is considered, an analyticalsolution is given, the actual situation is better met, and engineering application is easier.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas reservoir development, in particular to a method for calculating the productivity of horizontal wells with staged fracturing in heterogeneous shale reservoirs. Background technique [0002] At present, my country's and even the world's oil and gas exploration and development are gradually moving towards unconventional oil and gas fields, and horizontal wells + multi-stage multi-cluster fracturing technology has become an important technical means for exploiting such oil and gas reservoirs. Due to the characteristics of low porosity and low permeability of shale reservoirs, operators need to use horizontal well staged multi-cluster fracturing technology to form fracture networks in shale reservoirs, create "artificial oil and gas reservoirs", and achieve the purpose of improving oil and gas flow capacity. [0003] Due to sedimentation and diagenesis, the shale reservoir itself ha...

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Problems solved by technology

[0004] In view of the above problems, the present invention aims to provide a method for calculating the productivity of horizontal wells with staged fracturing in heterogeneous shale reservoirs, which solves the problem that the existing analytical calculation methods cannot consider the non-uniform permeability field of the reservoir, and is used to predict the non-uniform The production of staged fractured horizontal wells in the permeability field provides a favorable basis for the optimal design and post-fracture evaluation of staged fractured horizontal wells in shale reservoirs

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