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Method for activating indigenous microorganisms of oil reservoir for oil displacement after polymer flooding

A technology of endogenous microorganisms and oil displacement method, which is applied in the field of activated endogenous microorganisms in oil reservoirs after polymer flooding. It can solve the problems of single phosphorus salt system components and short residence time in reservoirs, so as to expand the swept volume, Increased interaction, improved mobility effects

Active Publication Date: 2014-12-24
PETROCHINA CO LTD +1
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  • Application Information

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Problems solved by technology

[0017] The invention provides a method for activating endogenous microorganisms in oil reservoirs after polymer flooding for the shortcomings of single nitrogen and phosphorus salt system components and short residence time in oil reservoirs after polymer flooding in Daqing Oilfield.

Method used

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  • Method for activating indigenous microorganisms of oil reservoir for oil displacement after polymer flooding
  • Method for activating indigenous microorganisms of oil reservoir for oil displacement after polymer flooding
  • Method for activating indigenous microorganisms of oil reservoir for oil displacement after polymer flooding

Examples

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Effect test

Embodiment 1

[0087] Embodiment 1, the slug design of endogenous microbial flooding

[0088] The endogenous microbial flooding of the reservoir after activated polymer flooding refers to the continuous injection of chemical agents with different slug sizes and functions into the target oil layer through the injection well. The endogenous microbial flooding slug in the reservoir after activated polymer flooding consists of activator slug and activator protection slug. Different slugs are solutions with relatively uniform concentrations prepared by different chemical agents. The slugs prepared by the same agent may have the same concentration or a concentration gradient difference according to the requirements of function and action.

[0089] In this embodiment, an activator slug is designed to activate endogenous microorganisms, and a protection slug is used in combination with an activator slug to effectively activate endogenous microorganisms and improve oil displacement efficiency.

[00...

Embodiment 2

[0108] Embodiment 2, on-site implementation and detection of oil displacement effect

[0109] The process flow of endogenous microbial flooding injection is as follows: figure 2 As shown, it can be seen that the various raw materials of the injected activator are added to the liquid distribution tank through the feeding gear pump, and the main line water from the water injection well is added to the liquid distribution tank by an external pipeline to dilute the various raw materials of the activator. Stir and mix in the liquid mixing tank, dissolve evenly, and then inject it into the target oil layer through a high-pressure injection pump. Field trials began on December 10, 2011. Before injecting the activator, in order to ensure the effect of the activator, a trial injection of the polymer mother liquor (recipe: use polymer polyacrylamide dry powder with a molecular weight of 16 million (produced by Daqing Refining and Chemical Company) and water to prepare a concentration ...

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Abstract

The invention discloses a method for activating indigenous microorganisms of an oil reservoir for oil displacement after polymer flooding. The method is characterized in that an oil displacement slug capable of activating indigenous microorganisms of the oil reservoir is injected into a target oil reservoir of the oil displacement through an injection well; the oil displacement slug comprises an activating agent slug and an activating agent protection slug; during an injection process, the activating agent slug and the activating agent protection slug are alternately injected for at least more than 2 times; the total volume of the activating agent slug is two times or more bigger than that of the activating agent protection slug (the most suitable range is controlled to be 2-5 times). According to the method disclosed by the invention, the number of the functional microorganisms of the oil reservoir is increased by injecting an exogenous activating agent; the recovery efficiency can be improved by 3-5 percent after the polymer flooding, and the applicability is good.

Description

technical field [0001] The invention relates to a method for activating endogenous microbial flooding in oil reservoirs after polymer flooding in the technical field of tertiary oil recovery. Background technique [0002] Endogenous microbial oil flooding technology was founded by academician Ivanov of the Institute of Microbiology of the Russian Academy of Sciences, and was officially named as the Ivanov oil recovery method in 2004. Endogenous microbial flooding is an emerging oil recovery technology, which activates beneficial microorganisms inside the reservoir by injecting activators into the formation, so as to achieve the purpose of enhancing oil recovery. A lot of research has been done on this technology at home and abroad (Wang Weidong, Microbial Oil Recovery Technology Research and Experiment, Petroleum Drilling and Production Technology, 2012, 34(1):107-112). [0003] In 1994, the DOE / BC / 14084-6 project of the US Department of Energy carried out the plugging adju...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 乐建君刘芳张继元柏璐璐李岩飞郭盟华姜江伍晓林韩培慧邵振波庞彦明刘晓波刘卫东尹中民陈金凤宋吉水
Owner PETROCHINA CO LTD
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