Method of raising oil deposil erude petroleum recovery ratio

A technology of oil recovery and crude oil, which is applied in the direction of extraction fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of crude oil cannot be driven out, waste of oil resources, crude oil residue, etc., to achieve enhanced oil recovery, Effect of reducing adsorption loss and enhancing flow viscosity

Inactive Publication Date: 2005-08-10
中国石化胜利油田有限公司地质科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, oil fields usually use water injection wells to flood oil, and the recovery rate of water flooding is about 30%, and there is still a large amount of crude oil remaining in the ground that cannot be recovered, resulting in a huge waste of oil resources that are already very tight
Polymer flooding is currently a relatively advanced tertiary recovery technology, which can increase the recovery rate by 10%, but there are still a large amount of crude oil that cannot be driven out

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] a. Make polyacrylamide into 2000mg / l mother liquor;

[0012] b. Use the injection pump to pump the foam agent into the liquid injection pipeline, and mix it with the polyacrylamide mother liquor and river water in a to form a mixed solution with a polyacrylamide concentration of 5000 mg / l and a foam agent concentration of 100 mg / l;

[0013] c. Inject the mixed solution in b under high pressure into the water injection well implementing enhanced foam flooding. First, inject an enhanced foam system of 0.2 times the formation pore volume as a pre-slug, and then alternately inject the enhanced foam solution and natural gas with a purity of 95%, alternately The period is 2 days and 2 days for liquid, and the underground volume ratio of liquid and gas is controlled to be 1:0.5.

Embodiment 2

[0015] a. Make polyacrylamide into 8000mg / l mother liquor;

[0016] b. Use the injection pump to pump the foam agent into the liquid injection pipeline, and mix it with the polyacrylamide mother liquor and reservoir water in a to form a mixed solution with a polyacrylamide concentration of 10000 mg / l and a foam agent concentration of 5000 mg / l;

[0017] c. Inject the mixed solution in b under high pressure into the water injection well implementing enhanced foam flooding. First, inject the enhanced foam system with 0.1 times the formation volume as the pre-slug, and then alternately inject the enhanced foam solution and nitrogen with a purity of 99%. , the alternating period is 15 days for weather and 15 days for liquid, and the underground volume ratio of liquid to gas is controlled to be 1:1.

Embodiment 3

[0019] a. Make polyacrylamide into 5000mg / l mother liquor;

[0020] b. Use an injection pump to pump the foam agent into the injection pipeline, mix it with the polyacrylamide mother liquor and sewage in a, and form a mixed solution with a polyacrylamide concentration of 100 mg / l and a foam agent concentration of 30000 mg / l;

[0021] c. Inject the mixed solution in b under high pressure into the water injection well implementing enhanced foam flooding. First, inject an enhanced foam system with 0.01 times the formation volume as a pre-slug, and then mix and inject the enhanced foam solution and natural gas to control the volume of liquid and gas. The ratio is 1:1.

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Abstract

A method for increasing the recovering rate of crude oil includes preparing the mixed solution from polyacrylamide, foaming agent and water, and proportionally filling said mixed solution and gas or N2 in the water injecting well alternatively by the alternative period of 20 days.

Description

Technical field: [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a method for increasing the recovery rate of crude oil in underground oil reservoirs in the late stage of oil field development. Background technique: [0002] When oilfield production is in the later stage of development, that is, it enters the stage of high water cut and ultra-high water cut. For many years, many experts in oil exploration technology have been working hard to discuss how to improve the development effect of old oilfields and increase recoverable reserves. At present, oilfields usually use water injection wells to flood oil, and the recovery rate of water flooding is about 30%, and there is still a large amount of crude oil remaining underground that cannot be recovered, resulting in a huge waste of oil resources that are already very tight. Polymer flooding is currently a relatively advanced tertiary recovery technology, which can increase t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 王其伟曹绪龙宋新旺李振泉郭兰磊张莉张明亮张继超
Owner 中国石化胜利油田有限公司地质科学研究院
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