Optimal design method for hydraulic fracture full-support sand fracturing

Abstract

The invention discloses an optimal design method for hydraulic fracture full-support sand fracturing. The method comprises the following steps that target well geology and engineering data are collected; fracturing fluid, self-support phase change fracturing fluid and a propping agent are selected; yield prediction is conducted, the flow conductivity of a support fracture is optimized, and the length and width of the support fracture are determined; fracturing testing is conducted, and basic parameters are determined; the geometric dimensions of a dynamic fracture and the support fracture are determined; self-support fracture parameters and the dosage of the self-support fracturing fluid are determined; fracturing and supporting work is completed through liquid injection; well shut-in phase change curing is conducted; well opening and pressure relief are conducted; full support of the hydraulic fracture is achieved through cooperation of the multiple fracturing fluid, sand-carrying fluid and displacement fluid, and waste of the dynamic fracture is avoided; the dosage of the multiple fracturing fluid, the sand-carrying fluid and the displacement fluid is optimized, full support is achieved, the simulation requirement is met, and liquid waste is avoided; and the far end of the fracture is supported by the solid propping agent formed through curing of the self-support phase change fracturing fluid, sand dike support formed by the sand-carrying fluid is not needed, and the length of the support fracture is indirectly increased.

Description

technical field [0001] The invention belongs to the technical field of exploration and development of oil and gas reservoirs, and in particular relates to an optimal design method of fully supported sand fracturing by hydraulic fractures. Background technique [0002] my country is rich in tight sandstone and shale oil and gas resources, and the efficient development of such resources is an important guarantee for national energy security. Since tight sandstone and shale oil and gas have the characteristics of low porosity and low permeability, and low natural production capacity, the establishment of underground high-conductivity channels through hydraulic fracturing is a key technical means to develop such resources. [0003] During the implementation of hydraulic fracturing, high-pressure liquid is injected into the formation through ground equipment with a displacement far exceeding the liquid absorption capacity of the formation, and the formation is pressed open to for...

AI Technical Summary

Problems solved by technology

Although this fracturing fluid can fully support hydraulic fractures, due to the waste caused by excessive use of fracturing fluid, etc., and the high cost of self-supporting fracturing fluid, it is difficult to achieve fracturing economic requirements while fully supporting fractures

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