Water-injection oil-replacement mining method applicable to fracture-cavity type carbonatite condensate gas reservoirs

A technology of condensate gas reservoir, water injection to replace oil, applied in the direction of production fluid, earthwork drilling and production, special data processing application, etc., can solve the problems of low recovery rate and depletion of condensate oil, achieve enhanced compatibility, avoid secondary Secondary pollution and the effect of restoring formation pressure

Active Publication Date: 2015-09-09
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] For fractured-vuggy carbonate condensate gas reservoirs, there are currently no development theories and methods for reference at home and abroad, so that such gas reservoirs are mainly developed in depletion mode, and the condensate oil recovery rate is as low as 12 %-25%, gas recovery rate 15%-50%

Method used

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Embodiment Construction

[0021] As the best implementation mode of the present invention, its steps are as follows:

[0022] a. Single well selection, not all condensate gas reservoirs are suitable for water injection to replace oil to enhance recovery, so modeling and numerical simulation techniques are used to study the mechanism of dual-media water injection for oil in combination with test production characteristics to explore different reservoirs Whether condensate gas reservoirs with different types and different condensate oil contents are suitable for water injection to replace oil in the middle and later stages of natural depletion development, so as to preliminarily determine the reservoir type and condensate gas reservoir type suitable for water injection for oil replacement; the use of water injection for oil replacement technology can improve Technical Feasibility of Condensate Recovery. After research, it has been found that single well or fracture-cavity reservoirs with insufficient nat...

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Abstract

The invention discloses a water-injection oil-replacement mining method applicable to fracture-cavity type carbonatite condensate gas reservoirs, wherein three-dimensional geologic models of condensate gas reservoirs with different reservoir types and different gas condensate contents are established through a modeling technology in combination with materials related to earthquake, logging, drilling and mud logging and dynamic production; a dual-media water-injection oil-replacement mechanism is then researched by a numerical simulation technology in combination with pilot production characteristics; an injection well, a water injection moment, a water injection amount, a water injection speed, quantity of water injection rounds and water injection intensity are optimized in order to realize multiple rounds of mining after a well soaking period is reached; and the water injection moment, the water injection amount, the water injection speed and the water injection intensity need to be optimized before each round of the mining. By the method, a life cycle of the fracture-cavity type carbonatite condensate gas reservoir can be prolonged, and rate of oil and gas recovery can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir exploitation, in particular to a water injection and oil replacement exploitation method suitable for fracture-cavity carbonate condensate gas reservoirs. Background technique [0002] The publication number is CN101942984A, and the publication date is January 12, 2011. The Chinese patent literature discloses a method for water injection and oil replacement for carbonate fracture-cavity reservoirs. The main steps are: 1. Test injection. When the elastic energy of the cave reservoir is insufficient, before normal water injection, a test injection is carried out within a certain period to determine the well position suitable for water injection to replace oil, and then the water injection rate is determined according to the type of the reservoir body. The high specific gravity liquid that is incompatible with crude oil is used to supplement the formation deficit and restore the formati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/18E21B43/22G06F17/50
Inventor 程亮王安平欧阳诚邓兴梁李世银刘德伦钟金银李柱正冯仁蔚王家辉邓明杰万勇车国杰
Owner BC P INC CHINA NAT PETROLEUM CORP
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