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A micro-support fracturing method to improve the stability period of fracturing

A stable period, fracturing technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problem of obtaining effective support

Active Publication Date: 2019-08-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This idea of ​​using a single large particle size proppant can usually only support the main fracture system with a large fracture width. Even if the branch fractures and micro-fracture systems with relatively small fracture widths are generated, it is difficult to obtain effective support.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0110] Well A, the fracturing section of the target layer is 3250.7-3261.5m, 10.8m / 1 layer; the lithology of the target layer is gray pebble-bearing fine sandstone, the core porosity is 4.2%-12.9%, the average is 9.73%, and the permeability is 0.1mD ~8.85mD, with an average of 3.73mD, which is a low porosity and ultra-low permeability reservoir; the pressure coefficient of the target layer is 1.0, and the formation temperature is 120°C, which belongs to normal temperature and pressure gas reservoirs. According to the interpretation of the stress profile, the average minimum principal stress of the target layer in this well is 44.1MPa, the minimum number average value of the minimum principal stress of the upper interlayer of the target layer is 47.5MPa, and the average minimum principal stress of the lower interlayer is 49.7MPa.

[0111] In order to evaluate the gas-bearing property and productivity of the sand group in the target layer, and to carry out the next exploration an...

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PUM

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Abstract

The invention discloses a method for slight fracture supporting, capable of increasing a fracture stabilization period. The method comprises the steps of (1) evaluation of a microstructure of reservoir rocks, (2) a first-stage injection phase, and (3) second-stage and third-stage injection phases. During the second step, (1) an ultralow-viscosity fracture solution carrying a micro-particle-diameter supporting agent is injected to communicate and extend natural fracture systems with micro scales, a low-viscosity fracture solution carrying a small-particle-diameter supporting agent is injected to communicate and extend natural fracture systems with large scales; a middle-viscosity fracture solution carrying a middle-particle-diameter supporting agent is injected to extend fracture systems with large scales; and (4) a high-viscosity fracture solution carrying a large-particle-diameter supporting agent is injected to extend fracture systems with the maximum scale. According to the invention, through fine evaluation of the microstructure of the reservoir rocks, alternate multi-stage injection, utilization of viscous fingering effects of various liquids with different viscosities, multi-scale sand adding and other methods, the fracture systems with the different scales within a full seam length scope of a main fracture can be fully expanded, extended and supported; and a "valid reshaping volume" of fractures and "supporting efficiency" of cracks are increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir hydraulic fracturing stimulation, and furthermore, relates to a micro-support fracturing method for improving the stable period of fracturing. Background technique [0002] In the fracturing stimulation of low permeability and tight sandstone oil and gas reservoirs, problems such as low initial production after fracturing, rapid production decline, and short production stabilization period are generally faced, and it is difficult to achieve the goal of economical and effective development after fracturing. Although the technical idea of ​​shale gas volume fracturing is sometimes used for reference in the fracturing of low-permeability or tight sandstone reservoirs, and technological parameters such as large liquid volume, large sand volume, high displacement, and low sand-liquid ratio are adopted, but after fracturing The effect is still unsatisfactory. At present, in the fracturing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 蒋廷学刘建坤安生吴春方眭世元吴峙颖王天驹周晓冬
Owner CHINA PETROLEUM & CHEM CORP
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