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Shale gas reservoir hydraulic fracturing production increasing method

A hydraulic fracturing and shale gas reservoir technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., to improve the effect of hydraulic fracturing and increase the output of a single well

Active Publication Date: 2013-09-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patent focuses on the structural design of the cluster fracturing device, using the cluster gas flow to initiate fractures in the formation, which is different from hydraulic fracturing in mechanism

Method used

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  • Shale gas reservoir hydraulic fracturing production increasing method
  • Shale gas reservoir hydraulic fracturing production increasing method

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Experimental program
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Embodiment

[0035]Well A is a continental shale gas well. The fracturing fluid adopts the resistance-reducing water system. The proppant adopts 100-mesh ceramsite + 40 / 70-mesh ceramsite + trailing 30 / 50-mesh ceramsite. The fracturing method adopts "multi-slug injection". -Temporary plugging-pressure suppression in the seam-induced steering"technology.

[0036] 1) The displacement of the pre-fluid joint-making stage is first increased to 6m 3 / min, then the displacement continues to increase to 8m 3 / min

[0037] 2) Alternate injection stage of pad fluid and 100-mesh ceramsite slug, initial proppant concentration 60kg / m 3 , when the first-stage 100-mesh ceramsite slug and the pre-displacement fluid pumping ended, the wellhead construction pressure monitoring showed a pressure drop of 3.1MPa, and the displacement rose to 11m 3 / min, the proppant concentration rises to 90kg / m 3 , the proppant concentration rises to 120kg / m after injecting the second-stage pre-displacement fluid 3 , the ...

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Abstract

The invention discloses a shale gas reservoir hydraulic fracturing production increasing method, which comprises the following steps: injecting quick water or resistance reducing water under the condition that the stress is greater than the shale bed fracture stress to crack the stratum; injecting a plurality of plugs, temporarily plugging, building pressure in a crack, inducing steering and laying a single layer of supporting agent at the later period; injecting the supporting agent with ultra-low density mixed with chopped fiber at low sand ratio and high pumping displacement; flowing back after closing. A target stratum is pressurized by using the quick water or the resistance reducing water with different construction pumping programs, supplemented by the temporary plugging technology, the in-crack pressure building technology and the filling technology of the supporting agent with ultra-low density, the superposition of multi-point induced stress fields produced in the stratum is promoted to form large-area cut slip artificial netlike cracks, the gas leakage area is expanded, and the single well yield is improved.

Description

technical field [0001] The invention relates to the field of oil production engineering, and more specifically, relates to a method for increasing production by hydraulic fracturing of shale gas reservoirs. Background technique [0002] At present, the fracturing of shale gas reservoirs is mainly to inject a large amount of fracturing fluid system such as resistance-reducing water or slick water into the wellbore by the surface high-pressure pump group under the condition of higher than the fracture pressure of the shale gas reservoir, and then through the perforation holes of the target layer to start the fracturing process. Cracked strata. Usually the whole process takes 8 ~ 10m 3 The fixed displacement per minute alternately injects the prefluid and proppant, and the proppant migrates and settles in the fracture to support and press the fracture, so that the fracture maintains a certain flow conductivity under the formation closure stress; at the same time, it also tries...

Claims

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Application Information

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IPC IPC(8): E21B43/267
Inventor 蒋廷学贾长贵王海涛陈作孙海成卫然李奎为
Owner CHINA PETROLEUM & CHEM CORP
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