Oil displacement and pressure reduction integrated method for increasing crude oil recovery ratio

A technology for oil recovery and crude oil, applied in chemical instruments and methods, mining fluids, earth drilling and production, etc., can solve problems such as difficulty in water injection, accumulation in a certain place in the formation, and increased water injection resistance, so as to ensure the effect of scale removal, Avoid the effect of secondary precipitation and channel blockage

Pending Publication Date: 2021-03-05
西安石油大油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of crude oil recovery is mainly to improve the sweep efficiency and oil displacement efficiency, while the current conventional water injection well profile control aims to improve the sweep efficiency of injected water and increase the production of oil wells, but it is only suitable for high water cut and ultra high water cut stages For oilfields with medium and low water cut, the profile control increases the water injection pressure, which leads to poor oil production in oil fields with low and medium water cut. During the process, long-term water injection p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1:

[0035] This embodiment takes the 10 water injection well groups of the Geng 269 trunk line in the Geng 271 block of the Chang 8 oil reservoir in Changqing Oilfield in May 2019 as an example to introduce, including the following steps:

[0036] A method for integrated oil flooding and pressure reduction to enhance oil recovery, comprising the following steps:

[0037] S1, configure the oil-displacing agent, and divide the oil-displacing agent into three parts: oil-displacing agent A, oil-displacing agent B and oil-displacing agent C. The components in the oil-displacing agent include cocamidopropyl betaine, complexing inhibitor Scale agent, deswelling agent, shrinking agent,

[0038] The massfraction of cocamidopropyl betaine is 80%, the massfraction of complexing scale inhibitor is 10%, the massfraction of swelling reducing agent is 5%, and the massfraction of shrinking agent is 5%;

[0039] S2. Dilute the oil-displacing agent A into water at a dilution c...

Example Embodiment

[0043] Example 2:

[0044] This embodiment takes the 325-97 well group of Town 277, Chang 8 Reservoir Town, Changqing Oilfield in July 2019 as an example to introduce, including the following steps:

[0045] A method for integrated oil flooding and pressure reduction to enhance oil recovery, comprising the following steps:

[0046] S1, configure the oil-displacing agent, and divide the oil-displacing agent into three parts: oil-displacing agent A, oil-displacing agent B and oil-displacing agent C. The components in the oil-displacing agent include cocamidopropyl betaine, complexing inhibitor Scale agent, deswelling agent, shrinking agent,

[0047] The massfraction of cocamidopropyl betaine is 75%, the massfraction of complexing scale inhibitor is 13%, the massfraction of expansion reducing agent is 6%, and the massfraction of shrinkage agent is 6%;

[0048] S2. Dilute the oil-displacing agent A into water, the dilution concentration is 0.6%, and then inject the diluted oil-d...

Example Embodiment

[0052] Example 3:

[0053] This embodiment takes the 311-777 well group in the 252 district of Chang8 oil reservoir town of Changqing Oilfield in December 2019 as an example to introduce, including the following steps:

[0054] A method for integrated oil flooding and pressure reduction to enhance oil recovery, comprising the following steps:

[0055] S1, configure the oil-displacing agent, and divide the oil-displacing agent into three parts: oil-displacing agent A, oil-displacing agent B and oil-displacing agent C. The components in the oil-displacing agent include cocamidopropyl betaine, complexing inhibitor Scale agent, deswelling agent, shrinking agent,

[0056] The massfraction of cocamidopropyl betaine is 70%, the massfraction of complexing scale inhibitor is 15%, the massfraction of swelling reducing agent is 7%, and the massfraction of shrinking agent is 8%;

[0057] S2. Dilute the oil-displacing agent A into water, the dilution concentration is 1.0%, and then injec...

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PUM

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Abstract

The invention discloses an oil displacement and pressure reduction integrated method for increasing crude oil recovery ratio. The integrated method comprises the following steps: S1, preparing an oildisplacement agent, and dividing the oil displacement agent into three parts, namely an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent is prepared from the components: cocamidopropyl betaine, a complexing scale inhibitor, a swelling reducing agent and a swelling shrinking agent; S2, diluting the oil displacement agent A, and then injecting the diluted oil displacement agent A into a perforation section layer of a water injection well; S3, diluting the oil displacement agent B, and then injecting the diluted oil displacement agent B into the perforation section layer of the water injection well; and S4, diluting the oil displacement agent C, and then injecting the diluted oil displacement agent C into the perforationsection layer of the water injection well. After the oil displacement agent is injected, the oil displacement agent can dissolve structural substances blocked in a stratum channel to form stable water-soluble compounds, channel blockage is avoided, betaine solution can quickly permeate into the structural substances to loosen the structural substances, the dispersed structural substances are dispersed into solution in a water injection channel, secondary precipitation of descaling substances is avoided, and the descaling effect is guaranteed.

Description

technical field [0001] The invention relates to the technical field of crude oil recovery, in particular to a method for enhancing crude oil recovery by integrating oil displacement and pressure reduction. The oil recovery method of the present invention is especially suitable for oil recovery in the Chang 4+5, Chang 6, and Chang 8 reservoir areas of the Triassic in Changqing Oilfield, wherein 4+5, 6, and 8 are the code names of oil layers in Changqing Oilfield. Background technique [0002] Crude oil is oil, also known as "black gold". It is customary to call unprocessed oil directly extracted from oil wells as crude oil. It is a dark brown or dark green viscous liquid or semi-solid combustible oil composed of various hydrocarbons. substance. [0003] my country's oilfield development stage implements water flooding to drive oil. After a long period of water injection, the current oilfield basically has three production stages: high water cut, ultra-high water cut, and med...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/584
CPCE21B43/16C09K8/584
Inventor 李志鹏何吉波顾中波张相春张国华邢志辉张鑫
Owner 西安石油大油气科技有限公司
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