A method for optimizing the number of stratified fracturing stages in low-permeability tight reservoirs

Abstract

The invention discloses a separate-layer fracturing stage number optimization method for a low-permeability compact reservoir. The separate-layer fracturing stage number optimization method comprises the steps that 1, a single well X fracturing position is divided into N transformation small layers; 2, assuming that the hydraulic fracture morphology is double-wing symmetrical cuboids, the corresponding hydraulic fracture transformation volume V is obtained under the certain fracturing liquid amount V<L> and the discharge amount Q<L>; 3, the N transformation small layers are divided into M fracturing sections from the point of fracture extension; 4, the fracturing liquid amounts V<L>, the discharge amounts Q<L> and the transformation volumes V corresponding to the fracturing liquid amounts V<L> and the discharge amounts Q<L> are obtained under different fracturing stage numbers; 5, the production income present value R of a single well X for three years is calculated under the different fracturing stage numbers and transformation volumes; 6, the hydraulic fracture transformation cost C is calculated under the different fracturing stage numbers; and 7, after fracturing is conducted, the production net present value (NPV) for three years is calculated, the relation curve of the different fracturing stage numbers and the NPVs is drawn, and the optimum fracturing stage number of the single well X is determined on the basis of the maximum NPV. The separate-layer fracturing stage number optimization method for the low-permeability compact reservoir is reliable in principle, convenient to operate and capable of providing a feasible method for production increase and transformation of oil and gas pools.

Description

technical field [0001] The invention relates to a method for optimizing the number of stratified fracturing stages used in low-permeability tight reservoirs during oil and gas exploration and development. Background technique [0002] With the deepening of oil and gas exploration work, it is found that most oil and gas reservoirs are characterized by low porosity, low saturation, and low permeability, making it difficult to exploit. In order to achieve commercial development value, hydraulic fracturing has become an essential production stimulation measure. There are generally multiple production layers in the vertical direction of oil and gas reservoirs, and each production layer has certain heterogeneity. However, oil fields usually adopt general fracturing (first-stage fracturing), and generally only one production layer can be exploited. Therefore, the fracturing of production layers is not highly targeted, and the production capacity of each production layer cannot be...

AI Technical Summary

Problems solved by technology

It is difficult to perform layered fracturing from the perspective of fracturing tools, and it is difficult to ensure that hydraulic fractures only extend in the production layer and do not extend into the interlayer from the perspective of fracturing technology

At the same time, the more stages of fracturing, the higher the cost of stimulation and transformation

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