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Liquid extraction method for binary compound flooding subsequent water flooding stage considering inter-well difference

A binary compound flooding and follow-up technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of not considering the difference in dynamic correlation of oil increment, limited development effect, etc.

Active Publication Date: 2015-05-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] At present, the liquid extraction method adopted in the oil field is a general liquid extraction method. This method does not consider the difference in the oil increase of each well group and the dynamic correlation between injection and production wells. The range of liquid extraction is limited, and the development effect of practical application is limited

Method used

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  • Liquid extraction method for binary compound flooding subsequent water flooding stage considering inter-well difference
  • Liquid extraction method for binary compound flooding subsequent water flooding stage considering inter-well difference
  • Liquid extraction method for binary compound flooding subsequent water flooding stage considering inter-well difference

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Embodiment 1

[0041] In a binary compound flooding pilot area, 19 wells are designed, see figure 2 , among them, 11 production wells and 8 injection wells, using the positive row injection-production well pattern, began to inject polymer pre-slug in September 2003, injecting 0.078 times the pore volume; began to inject polymer in June 2004 The binary main slug of material and surfactant injected 0.49 times the pore volume; in January 2010, it was transferred to follow-up water flooding. In order to ensure the development effect of subsequent water flooding, the liquid extraction measures were adjusted. This measure increases the injection and production volume of each single well at the end of chemical agent injection, and the average liquid extraction rate in the whole area is determined to be 20% after optimization, that is, the injection and production volume of 8 injection wells and 11 production wells are all increased from 960m 3 / d increased to 1152m 3 / d. The following takes the...

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Abstract

Disclosed is a liquid extraction method for a binary compound flooding subsequent water flooding stage considering inter-well difference. The liquid extraction injection quantity of each single well is optimized according to oil increment after chemical agent injection, and the liquid extraction yield of each single well is optimized according to dynamic relevancy between an injector and a producer. The effective liquid extraction is based on the difference between the oil increasing effect after binary injection and the dynamic relevancy between the injector and the producer, the liquid extraction injection quantity is distributed according to the oil increasing effect of each well group after binary injection, larger liquid extraction injection quantity is distributed for the well with better oil increasing effect of the chemical agent injection stage, single well liquid production capacity is distributed according to the inter-well dynamic relevancy in the well group based on the principle of well group injection and production balance, small liquid production capacity is distributed for a production well with high dynamic relevancy to an injection well, and conversely, large liquid production capacity is distributed for a production well with low dynamic relevancy to the injection well.

Description

technical field [0001] The invention relates to a liquid extraction method in the follow-up water flooding stage of binary compound flooding in consideration of differences between wells, and belongs to the technical field of oil exploitation. Background technique [0002] For oil reservoirs with strong heterogeneity, high crude oil viscosity, high water content, and prominent development contradictions, the binary compound flooding technology of injecting two chemical agents, polymer and surfactant, can make full use of the polymer to improve the water-oil mobility Ratio and surfactants can reduce the interfacial tension of oil and water to achieve a better effect of precipitation and oil increase. However, with the further increase of polymer and surfactant injection, the oil increasing effect becomes worse. Therefore, due to the limitation of development effect and economic benefits, the dosage of polymer and surfactant needs to be optimized. Subsequent water flooding de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B47/00
CPCE21B43/16E21B43/20
Inventor 刘永革侯健吴海君于波郭兰磊元福卿魏翠华单联涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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