Horizontal well cross-layer fracturing feasibility evaluation method

Abstract

The invention discloses a horizontal well cross-layer fracturing feasibility evaluation method, comprising the following steps: S1, establishing a single well geologic model; S2, simulating an artificial fracture propagation rule; S3, performing cross-layer fracturing feasibility judgment; S4, analyzing the trafficability of the sand-carrying fluid in the mudstone interlayer artificial fracture; S5, performing experimental evaluation of the flow conductivity of different sand paving concentrations in the mudstone interlayer; and S6, comprehensively evaluating the feasibility of cross-layer fracturing. The horizontal well cross-layer fracturing feasibility evaluation method can evaluate whether adjacent hydrocarbon reservoirs can be considered or not while fracturing transformation of the target hydrocarbon reservoir is performed, can scientifically evaluate the trafficability of the sand-carrying fluid in the mudstone interlayer artificial fracture and the mudstone interlayer fracturing flow conductivity, can accurately analyze whether the adjacent oil and gas reservoirs can realize sand filling and whether the flow conductivity of mudstone interlayers after fracturing can meet therequirements of oil and gas seepage or not, and provides a reliable, comprehensive and scientific evaluation method for the feasibility of field implementation of the horizontal well cross-layer fracturing technology, and by means of the method, evaluation before fracturing and analysis and judgment after fracturing can be conducted at the same time.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development fracturing engineering, in particular to a method for evaluating the feasibility of horizontal well penetration fracturing. Background technique [0002] As we all know, horizontal wells are an effective means for the development of tight and low-permeability oil and gas fields. In this study, it is hoped that artificial fractures can be used to communicate with other adjacent oil and gas layers while the target oil and gas layer is being stimulated, which can not only increase the productivity of a single well, but also increase the production rate of geological reserves, and realize the purpose of multi-layer development of a single well. [0003] However, in the actual application process, the effect of interlayer fracturing did not meet expectations. For this reason, the documents "Application of Horizontal Well Controlled Layer-Penetrating Fracturing Technology in Low P...

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Problems solved by technology

However, due to the high clay content of the mudstone interlayer, the strong plasticity of the mudstone, and the narrow width of artificial fractures, not only the problem of whether the interlayer can be opened during the implementation of interbedded fracturing, but also the problem that the sand-carrying fluid is easy to occur in the artificial fractures of the mudstone interlayer. The condition of "fluid but not sand" leads to unsatisfactory proppant laying effect in adjacent oil and gas layers; in addition, due to the narrow width of artificial fractures in the mudstone interlayer, the concentration of proppant laying after fracturing is low, and because the proppant is in the mudstone The embedding in the interior exacerbates the reduction of the conductivity of artificial fractures

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