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Method for improving recovery efficiency based on retained gas

A technology of recovery factor and gas retention, applied in the field of oil and gas field exploration and development, can solve the problems of limited operating costs and difficulty in popularization and application, and achieve the effects of reducing water treatment costs, reducing oilfield water content, and increasing development benefits

Active Publication Date: 2020-06-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Its effectiveness depends on the reservoir characteristics, well pattern structure and the adaptability of the chemical system, etc., limited by the operating cost, it is difficult to popularize and apply

Method used

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  • Method for improving recovery efficiency based on retained gas
  • Method for improving recovery efficiency based on retained gas
  • Method for improving recovery efficiency based on retained gas

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Embodiment Construction

[0026] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0027] figure 1 A flowchart showing the steps of the method for enhanced oil recovery based on trapped gas according to the present invention.

[0028] In this embodiment, the method for enhanced oil recovery based on retained gas according to the present invention may include: Step 1: Stop water injection after water flooding the target reservoir to the limit water cut; Step 2: Determine the gas injection well according to the characteristics of the target reservoir location and qua...

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Abstract

The invention discloses a method for improving recovery efficiency based on retained gas. The method comprises the following steps of 1, stopping water injection after a target oil reservoir is subjected to water flooding to the limit water cut; 2, determining the positions and the number of gas injection wells according to the characteristics of the target oil reservoir; 3, injecting gas into thegas injection wells, and closing the gas injection wells and production wells for a first preset period of time to form the retained gas; 4, stopping water injection after the target oil reservoir issubjected to water flooding again to the limit water cut, and recording the recovery efficiency of the target oil reservoir in the process; 5, setting a frequency threshold value and a recovery efficiency increase threshold value, judging whether the gas injection frequency reaches the frequency threshold value, if yes, finishing oil recovery, and if not, executing the step 6; and 6, judging whether the recovery efficiency increase amount is smaller than the recovery efficiency increase threshold value or not, if not, repeatedly executing the steps 3-5, and if yes, finishing oil recovery. According to the method, the retained gas is built in the oil reservoir, so that the water control over the high-water-content oil reservoir is improved, and the recovery efficiency and the economic benefit are improved.

Description

technical field [0001] The invention relates to the field of exploration and development of oil and gas fields, and more specifically relates to a method for enhancing recovery based on retained gas. Background technique [0002] In order to realize water control in high water-cut reservoirs, oilfield production companies have adopted a variety of technical methods, such as strengthening fine geological research, further understanding of sedimentary facies and sedimentary microfacies, subdividing strata, and achieving precise water injection; adjusting injection-production structure , to implement comprehensive adjustment and treatment of high water-cut periods; to use water-seeking and water-blocking technology to prevent and seal high-yield aquifers, etc. For example, adjust the well pattern structure, strengthen the water injection in the direction of low water cut on the plane, and limit the water injection in the direction of high water cut, so that the well pattern can...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/20
CPCE21B43/168E21B43/20
Inventor 计秉玉伦增珉于洪敏
Owner CHINA PETROLEUM & CHEM CORP
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