Fracturing method for improving laying effect of heterogeneous reservoir proppant

Abstract

The invention discloses a fracturing method for improving a laying effect of a heterogeneous reservoir proppant, and relates to the technical field of oil and gas field sand fracturing processes. According to the method, geological data of a target well are collected and evaluated; according to the target well reservoir permeability and the single artificial fracture control radius, the segment length, the cluster spacing and the cluster number are designed; the artificial fracture length, the flow conductivity, the fracturing fluid scale and the fracturing proppant scale are designed on the basis of achieving the optimal yield; testing fracturing is conducted on the target well, and the reservoir fracturing fluid efficiency of the target well is determined; the usage amounts of prepad fluid, prepad sand-carrying fluid and sand-carrying fluid are calculated according to the determined fracturing fluid scale and the determined fracturing fluid efficiency correspondingly; the use amountof displacing fluid is determined according to the volume of a target well shaft; and a pump injection program is generated according to the determined proppant scale as well as the determined amountsof the prepad fluid, the prepad sand-carrying fluid, the sand-carrying fluid and the displacing fluid, and fracturing operation is implemented. The method solves the technical problem that unsupported and invalid seams are formed in the fracturing process due to the fact that the proportion of the prepad fluid cannot be completely matched with a reservoir stratum in traditional fracturing design.

Description

technical field [0001] The invention relates to the technical field of sand fracturing technology in oil and gas fields. Background technique [0002] my country's tight sandstone oil and gas resources are very rich, and the national technically recoverable resources are about 12 trillion cubic meters. The efficient development of such resources can provide an important guarantee for national energy security. Since tight sandstone has the characteristics of low permeability and low porosity, and the permeability is usually between 0.01-1mD, the establishment of underground high-permeability channels through hydraulic fracturing is a necessary technical means for the effective exploitation of such resources. During the implementation of hydraulic fracturing, high-pressure liquid is injected into the rock formation through ground equipment to form artificial fractures in the rock formation. At the same time, the high-pressure liquid carries a certain strength of proppant into ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the defects and deficiencies of the above-mentioned prior art, and to provide a fracturing method that improves the effect of proppant laying in heterogeneous reservoirs. Pre-sand-carrying fluid and stepwise variable-viscosity slick water are used to realize the coordinated operation of pre-stage fracture creation and proppant laying, which solves the problem of inconsistency in the fracturing process caused by the incomplete matching of the pre-fluid ratio with the reservoir in the traditional fracturing design. The technical problems of support and invalid fractures ensure the effective placement of proppant in the entire fracturing fracture

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