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

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Problems solved by technology

However, the patent focuses on the structural design of the cluster fracturing device, using the cluster

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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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

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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