A method for improving oil displacement efficiency in medium and low water cut oilfields

A technology for water-bearing oilfields and oil displacement efficiency, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problem of ineffective displacement of remaining crude oil, poor improvement of crude oil production, and increased water injection stress and other issues

Active Publication Date: 2022-03-15
陕西银禾油气工程技术服务有限公司
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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 In the water injection oilfields, the effect of increasing the crude oil production of medium and low water content oilfields is not good, and because the profile control increases the water injection pressure, the subsequent water injection is difficult, and the water injection fails to meet the requirements, resulting in insufficient injection, so that the remaining crude oil cannot be effectively displaced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment introduces the example of Bai 217-3 well group in Chang 6 oil reservoir of Baibao Oilfield. The method for improving the oil displacement efficiency of medium and low water cut oilfields includes the following steps:

[0039] Step 1: configure a cocamidopropyl betaine aqueous solution with concentration a = 0.5%, and configure b concentration = 0.4% cocamidopropyl betaine aqueous solution.

[0040] Step 2: The cocamidopropyl betaine solution in step 1 is injected into the oil well before preparations, including testing, well washing, pressure testing, and water test injection; wherein, the test is to take the water absorption indicator curve, pressure Drop curve and other data; well flushing is to stop injection one day before construction, and backwash the well until the water quality of the inlet and outlet is consistent; pressure test is to connect the surface pipeline, test the pressure at 25MPa, stabilize the pressure for 5 minutes, and it is qualifi...

Embodiment 2

[0048] This embodiment introduces the example of the Bai 216-4 well group in the Chang 8 oil reservoir of the Baibao Oilfield, and the method for improving the oil displacement efficiency of the medium-low water-cut oilfield includes the following steps:

[0049] Step 1: configure the cocamidopropyl betaine aqueous solution with a concentration=0.8%, and configure the cocamidopropyl betaine aqueous solution with b concentration=0.7%, at the concentrations of a and b Add polyethylene glycol to the cocamidopropyl betaine aqueous solution, so that the concentration of polyethylene glycol is 0.5%±0.1%.

[0050] Step 2: The cocamidopropyl betaine solution in step 1 is injected into the oil well before preparations, including testing, well washing, pressure testing, and water test injection; wherein, the test is to take the water absorption indicator curve, pressure Drop curve and other data; well flushing is to stop injection one day before construction, and backwash the well until...

Embodiment 3

[0058] This embodiment introduces the Bai 206-1 well group example of the Chang 4+5 oil reservoir in the Baibao Oilfield, and the method for improving the oil displacement efficiency of the medium-low water-cut oilfield includes the following steps:

[0059] Step 1: configure the cocamidopropyl betaine aqueous solution with a concentration=0.4%, and configure the cocamidopropyl betaine aqueous solution with b concentration=0.3%, at the concentrations of a and b Add microspheres or polymers to the cocoamidopropyl betaine aqueous solution, so that the concentration of microspheres or polymers is 0.6%±0.1%.

[0060] Step 2: The cocamidopropyl betaine solution in step 1 is injected into the oil well before preparations, including testing, well washing, pressure testing, and water test injection; wherein, the test is to take the water absorption indicator curve, pressure Drop curve and other data; well flushing is to stop injection one day before construction, and backwash the well...

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PUM

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Abstract

The invention provides a method for improving the oil displacement efficiency of medium and low water-cut oilfields. The crude oil in medium-low water-cut oilfields uses cocamidopropyl betaine solution to carry out oil displacement recovery, and the method for medium-low water-cut oilfields comprises the following steps: step 1. Cocamidopropyl betaine solution configuration; step 2, preparation before injection of cocamidopropyl betaine solution into the oil well; step 3, injecting cocamidopropyl betaine solution into the oil well; step 4, forward Inject clean water, drive and cover the cocamidopropyl betaine solution to the oil displacement area, shut down the well and wait for condensation; step 5, inject clean water alternately in forward and reverse directions, and after multiple cycles, backwash the oil flooding well to make the The outlet water quality is the same; Step 6, test the water absorption profile of the oil well; Step 7, repeat the above steps 2 to 6 in sequence, until the crude oil in the oil well is recovered after repeated cycles. The oil recovery method of the invention can reduce the water injection pressure of the medium-low water content oil field, increase the crude oil output, and further improve the oil displacement efficiency.

Description

technical field [0001] The invention relates to the technical field of crude oil recovery, in particular to a method for improving the oil displacement efficiency of medium and low water-cut oilfields. The oil recovery method of the invention is more suitable for the Chang 4+5, Chang 6 and Chang 8 oil reservoir areas of the Triassic of oil production. 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 medium-low water cut. In order to tap the remaining oil in these three stages, it is often used Technical method of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22C09K8/584C09K8/588
CPCE21B43/16C09K8/584C09K8/588
Inventor 李志鹏张晓卫杨春军孙胜平
Owner 陕西银禾油气工程技术服务有限公司
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