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A Fracturing Method for Improving the Effect of Propant Laying in Heterogeneous Reservoirs

A heterogeneous reservoir and proppant technology, applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as unsupported, and achieve the effect of reducing the settlement velocity and construction friction

Active Publication Date: 2022-02-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A Fracturing Method for Improving the Effect of Propant Laying in Heterogeneous Reservoirs
  • A Fracturing Method for Improving the Effect of Propant Laying in Heterogeneous Reservoirs
  • A Fracturing Method for Improving the Effect of Propant Laying in Heterogeneous Reservoirs

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Embodiment 1

[0038] As the best implementation mode of the present invention, it discloses a fracturing method for improving the proppant laying effect of heterogeneous reservoirs, which includes:

[0039] A. Collect and evaluate geological data of target wells;

[0040] B. According to the reservoir permeability of the target well and the control radius of a single artificial fracture, the segment length, cluster spacing and cluster number are designed;

[0041] C. Design artificial fracture length, flow conductivity, fracturing fluid scale and proppant scale based on optimal production;

[0042] D. Carry out test fracturing on the target well, and determine the efficiency η of the target well reservoir fracturing fluid;

[0043] E. According to the determined fracturing fluid scale and fracturing fluid efficiency, calculate the usage of pre-fluid, pre-sand-carrying fluid and sand-carrying fluid respectively;

[0044] The design volume of prefluid V p is the total fluid volume of the f...

Embodiment 2

[0058] For a specific application example, take a horizontal well QL in the tight sandstone gas reservoir of the Shaximiao Formation in central Sichuan as an example. Point A of the well has a vertical depth of 2225.88m and an oblique depth of 3110m, point B has a vertical depth of 2250.31m and an oblique depth of 4025m, and the horizontal section is 915m long , the horizontal section explains 5 sections of gas layers in total, with a thickness of 792m, a reservoir thickness of 601.6m, an average porosity of 10.5%, and a total average water saturation of 41.3%.

[0059] A. Collect and evaluate geological data of target wells, including but not limited to, 3D seismic data, drilling data, mud logging data, well logging data, and core test data;

[0060] B. According to the reservoir permeability of the target well and the control radius of a single artificial fracture, design the segment length, cluster spacing, and cluster number. The wells are divided into 16 sections and 52 c...

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Abstract

The present invention disclosed a fracture method for improving the effects of non -average reservoirs supporting agent, involving the field of oil and gas fields and sand fracturing technology.Collect and evaluate the geological data of the target well; design section length, cluster spacing and clusters according to the target well reservoir penetration and single artificial crack control radius;The scale and support agent scale of the liquid; carry out test fracture to the target well to determine the efficiency of the fracture fluid of the target well reservoir; calculate the front liquid, the front sand and the front sand and the fracture fluid efficiency according to the determined fracture liquid size, the fracture fluid efficiencyUse the amount of sand liquid; determine the amount of the top alternative liquid according to the volume of the target well; according to the determined support agent scale and the front solution, the sandwiches, the sandwiches and the top alternative liquid, generateOperation.The present invention solves the technical problem that has no support and invalid seam due to the inability to fully match the proportion of the front liquid and the reservoir in the traditional fracture 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267C09K8/68G06F30/20
CPCE21B43/267C09K8/68C09K8/885C09K2208/26
Inventor 何乐郑云川袁灿明龚蔚寇双锋陈锐张晓虎陈星宇
Owner BC P INC CHINA NAT PETROLEUM CORP
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