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Layered refracturing method

A technology of repeated fracturing and fracturing, which is applied in the field of fracturing and stimulation of oil and gas reservoirs, and can solve the problems of lack of successful implementation precedents and difficulty in ensuring stimulation effects.

Active Publication Date: 2018-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(2) Even in layered refracturing, considering the coupling model of fracture induced stress and induced stress caused by production at the same time, the initiation and extension of fractures during refracturing also have large uncertainties, and it is difficult to guarantee Ideal production increase effect can be achieved after pressing
[0007] At present, there are few relevant literature reports on multi-thin layer layered refracturing in China, and there is also a lack of relevant successful implementation precedents

Method used

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Embodiment

[0074] Well A is a sidetracking data well located in a thin-bedded block in the Jianghan Basin. The lithology of the target interval is brownish-gray oil-stained siltstone with well-developed natural fractures. The fracturing interval of the target layer is 2281.0-2284.8m, 3.8m / 3 layers, the average Young's modulus of the reservoir is 28.0GPa, and the average Poisson's ratio is 0.25.

[0075] The in-situ stress profile of the fracturing target layer of well A is as follows figure 1 As shown, the minimum principal stress value of the target layer in this well is 44MPa-48Mpa, the minimum principal stress value of the upper interlayer of the target layer is 50MPa-52MPa, the minimum principal stress value of the lower interlayer of the measure layer is 57MPa-59MPa, and the lower interlayer of the target layer is between 50MPa and 59MPa. The layer occlusion condition is better than the upper part of the target layer.

[0076] During the first fracturing of the well, due to imprope...

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Abstract

The invention provides a layered refracturing method. The method includes the following steps that the reservoir characteristic parameter and the initial crack characteristic parameter are obtained; and a layered refracturing mode, the fracturing fluid and layered refracturing construction parameter are selected; if necessary, initial cracks are repaired; refracturing is conducted to obtain new cracks; balancing and replacement are conducted. According to the method, a suitable layered refracturing mode is selected, the initial cracks and a propping agent are made full use of, the process parameters of refracturing are optimized so as to achieve optimum matching with a reservoir and form the new cracks, on this basis, the fracturing extent of each layer is improved, the height and extending of the new cracks are controlled, the crack propping profile is rationally optimized and controlled, the complexity degree of the new cracks is improved, and the volume is effectively transformed.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir fracturing stimulation stimulation technology, in particular to a layered repeated fracturing method, especially a layered repeated fracturing method suitable for multi-thin sandstone oil and gas reservoirs. Background technique [0002] At present, multi-thin layer (thin interbedded) reservoirs are widely distributed in Songliao Basin, Ordos Basin, Jianghan Basin and other regions in China, with considerable recoverable reserves. With the deepening of oilfield exploration and development and the intensification of production decline in many oil and gas fields, multi-thin reservoirs have become the main replacement blocks for domestic oil and gas fields to increase reserves and production, tap potential and stabilize production. The fracturing of multi-thin layer reservoirs generally requires layered fracturing techniques, such as packer mechanical fracturing, sand filling fracturing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/27
CPCE21B43/26E21B43/267
Inventor 蒋廷学刘建坤王宝峰吴峙颖周珺贾文峰刘世华眭世元
Owner CHINA PETROLEUM & CHEM CORP
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