Method suitable for effective flow guide for fractures in fracturing of shale oil pool reservoir

A volume fracturing and shale oil technology, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc. It can solve problems such as poor effectiveness, short stable production period after fracturing, and the effective production of reserves that affect the effective development of reservoirs. , to achieve the effect of expanding the scope and improving the volume of transformation

Active Publication Date: 2017-06-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] Fracturing in shale oil reservoirs also faces difficulties such as poor effectiveness after fracturing, difficulty in "effective" support, poor long-term fluid conductivity, and short stable production period after fracturing. Most shale oil reservoirs at home and abroad are affected by technical bottlenecks. The effective development of this type of reservoir and the effective production of reserves

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  • Method suitable for effective flow guide for fractures in fracturing of shale oil pool reservoir
  • Method suitable for effective flow guide for fractures in fracturing of shale oil pool reservoir
  • Method suitable for effective flow guide for fractures in fracturing of shale oil pool reservoir

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Embodiment 1

[0052] Well A is a shale oil pilot horizontal well in a certain block of an oilfield. The target section of this well is 1516.0-1916.0.0m, and the A horizontal section is 400m long; the lithology of the target section is dolomitic shale, and the natural fractures are compared Development; target layer temperature is 68°C, Young's modulus 24-27Gpa, Poisson's ratio 0.23-0.25, minimum horizontal principal stress 26-29Mpa, maximum horizontal principal stress 32-35Mpa, overlying formation pressure 34-37MPa, horizontal stress Coefficient of difference: 0.03-0.15, brittleness index 73%.

[0053] Using the method proposed by this patent to improve the effective conductivity of shale oil volume fracturing fractures, the well was divided into 5 sections, each section had 4 clusters of perforation, a single cluster of 0.75m, and a cluster spacing of 15-20m, and the well was tested. The optimal design of the fracturing reconstruction plan and the on-site pilot test, the fracturing string ...

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Abstract

The invention relates to the technical field of hydraulic fracturing capacity increasing revamping of oil and gas reservoirs, in particular to a method suitable for effective flow guide for fractures in fracturing of a shale oil pool reservoir. The method includes the following steps that A, the reservoir is pretreated through acid liquor; B, the main fracture is constructed through low-viscosity fracturing fluid; C, the micro fractures and the branch fractures are opened by injecting low-viscosity slickwater; D, slugging is conducted by injecting low-viscosity acid liquor and low-viscosity slickwater alternately; E, low-viscosity slickwater carrying a proppant and low-viscosity fracturing fluid carrying a proppant are injected in sequence so as to support a micro fracture system and a branch fracture system, and the first proppant is different from the second proppant; F, intermediate-viscosity fracturing fluid carrying proppants is injected so as to support a main fracture system; and G, the fourth proppant in a shaft is completely displaced to the openings of the fractures by means of the low-viscosity slickwater.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing stimulation of oil and gas reservoirs, and more particularly relates to a method suitable for effective flow diversion of fractures in shale reservoir fracturing. Background technique [0002] my country's shale oil has great resource potential. According to statistics, the recoverable shale oil resources in China's main basins are about 30×10 8 -60×10 8 t, mainly distributed in the Bohai Bay, Songliao, Ordos, Jianghan, Junggar, Nanxiang and other basins, and has obtained shale industry in Biyang depression, Liaohe depression, Jiyang depression, Dongpu depression and other geological units. Oil flow reveals the resource potential of shale oil in mud shale formations in continental basins in my country. With the continuous decline of conventional oil and gas production worldwide, shale oil development has become the frontier of oil exploration and a hot spot for oil field reserves incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/27E21B43/267
CPCE21B43/26E21B43/267E21B43/283
Inventor 刘建坤蒋廷学吴春方卞晓冰贾文峰魏娟明吴峙颖刘红磊
Owner CHINA PETROLEUM & CHEM CORP
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