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Method for increasing production by injecting gas at different development stages of inclined fault block oil reservoir

A gas injection technology in the development stage, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of "attic oil" that is difficult to effectively develop, achieve obvious production increase effect, increase production pressure difference, Good blocking effect

Inactive Publication Date: 2018-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] Aiming at the problem that it is difficult to effectively develop the "attic oil" distributed in high parts of inclined fault-block reservoirs at the present stage, the present invention provides a method for increasing production by gas injection in different development stages of inclined fault-block reservoirs

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  • Method for increasing production by injecting gas at different development stages of inclined fault block oil reservoir
  • Method for increasing production by injecting gas at different development stages of inclined fault block oil reservoir
  • Method for increasing production by injecting gas at different development stages of inclined fault block oil reservoir

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Embodiment Construction

[0010] Technical scheme of the present invention is as follows:

[0011] A method for increasing production by gas injection in different development stages of an inclined fault-block reservoir, which is carried out in three stages, including the following steps:

[0012] (1) The first stage—continuous gas injection: the gas injection well at the high position continuously injects gas into the inclined fault block reservoir at a constant injection rate, and the production well at the low position produces at a constant injection-production ratio. When the gas-oil ratio reaches 1000 : When 1, it is considered as severe gas channeling, stop gas injection;

[0013] (2) The second stage—periodic alternate gas injection production: close the production well after severe gas channeling, continue to inject gas at a constant injection rate, and stop gas injection when the reservoir is pressurized to 0.8 to 1.2 times the original reservoir pressure; Start the production well after sta...

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Abstract

The invention relates to a method for increasing production by injecting gas at different development stages of an inclined fault block oil reservoir. The method comprises three stages that firstly, gas is injected into a high position of a fault block oil reservoir structure to drive the top remaining oil, production is carried out in production wells at low positions, while due to the serious gas channeling, the production wells produce a large amount of gas very quickly and produce little or no more oil; secondly, the production wells are shut down, and the gas injection pressurization is continued, a gas injection well is closed for standing when pressure is increased to a certain level, oil and gas are transported again due to gravity differentiation, a gas channeling channel is filled, and a certain scale of gas cap is formed, and then a well is opened for production, due to the redistribution of the gas channeling channel and the expansion energy of the gas cap, a better increasing production effect is obtained, and the gas well and the production wells are periodically and alternately switched until the development effect of the production wells deteriorates; and thirdly, the gas and foaming agent solutions are injected into a reservoir from the gas injection well at the same time and after forming foams, the foams have a good plugging effect on the gas channeling channel, and thus the development effect is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for increasing production by gas injection in different development stages of inclined fault block reservoirs. Background technique [0002] When the inclined fault-block reservoir enters the late stage of high water cut, it is difficult to develop economically and effectively the "attic oil" located at the structural high. At this time, the method of top gas injection can often achieve a better production increase effect. Top gas flooding is used for development. During the gas injection process, the large oil-gas density difference is used to generate gravity differentiation, which can re-accumulate the "attic oil" that has not reached the top of the reservoir after the water flooding stage, so that To improve the sweep coefficient of the reservoir, the secondary gas cap itself has gas expansion energy, which can evenly push the oil-gas contact to move t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/22
CPCE21B43/16E21B43/166E21B43/168
Inventor 鹿腾李兆敏徐正晓姚安川李晓军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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