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Novel tight sand-conglomerate reservoir fracture net supporting and improving method

A technology of sandy conglomerate and a new method, applied in the field of oil and gas exploitation, can solve the problems of not being able to significantly increase the degree of oil and gas recovery, and the small area of ​​reservoir stimulation, so as to improve the efficiency of reservoir stimulation, avoid sand plugging, and develop efficiently Effect

Active Publication Date: 2019-02-15
CHINA UNIV OF PETROLEUM (BEIJING) +2
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AI Technical Summary

Problems solved by technology

[0007] Since micro-fractures are easy to form during the hydraulic fracturing of tight glutenite, causing sand plugging, it is necessary to increase the displacement and viscosity of the fracturing fluid to form wide fractures and avoid the generation of branch fractures. Small, unable to significantly increase oil and gas recovery

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  • Novel tight sand-conglomerate reservoir fracture net supporting and improving method
  • Novel tight sand-conglomerate reservoir fracture net supporting and improving method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0025] A new method for fracture network support reconstruction of tight sandy conglomerate reservoirs of the present invention comprises the following steps:

[0026] (1) Inject fracturing fluid into the formation at a displacement of 0.5-3 cubic meters per minute; wherein the formation is a tight sandy conglomerate reservoir with a permeability not greater than 1mD, and the fracturing fluid is slick water with a viscosity less than 10mPa·s ;

[0027] (2) Inject microproppant fluid, the injection rate is 1.0-10.0 cubic meters per minute, and the microproppant is no more than 200 mesh proppant, for the concentration equal to or less than the critical bridging concentration of microproppant, will include Microproppant fracturing fluid is pumped into the wellbore;

[0028] The microproppant also includes stratum shear fracture, rock fragmentation, a...

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Abstract

The invention discloses a novel tight sand-conglomerate reservoir fracture net supporting and improving method. The method comprises the following steps that a stratum is filled with fracturing fluid;branch seams are supported in the stratum; the stratum is filled with a conventional supporting agent to support the main fracture; and replacing is conducted by neutral or alkaline liquid with low viscosity and accommodated in at least one construction tubular column, and fracture net improving of the reservoir is completed. Fracture net fracturing is formed in the sand-conglomerate. Graded support is conducted with the supporting technology by the self-supporting or micro-supporting agent, sand plug is avoided, oil deposit improving efficiency of the tight sand-conglomerate reservoir is obviously improved, and the hydrocarbon reservoir can be developed economically and efficiently.

Description

technical field [0001] The invention relates to a new method for fracture network support reconstruction of tight sandy conglomerate reservoirs, belonging to the technical field of petroleum and natural gas exploitation. Background technique [0002] Tight sandy conglomerate reservoirs are widely distributed in my country. Because most of the reservoirs have poor physical properties, strong heterogeneity, low porosity and low permeability, and low natural productivity, hydraulic fracturing technology is an important method to make them have development value. . However, due to the presence of gravel, a large number of fractures are distorted and multiple fractures expand during the fracturing process, and the width of the branch fractures is narrow. When proppant is injected to support the fractures, sand plugging is easy to form, thereby reducing the quality and efficiency of fracturing. [0003] The lithology of typical glutenite reservoirs in my country is mainly composed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267Y02A10/40
Inventor 周福建李根生葛洪魁王博曲鸿雁姚二冬梁天博杨晨盛茂胡佳杨凯
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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