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Method for improving recovery rate of crude oil in oil well

A technology for oil recovery and oil wells, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc. It can solve the problems that the improvement of oil washing efficiency is not obvious, not very good, and cannot further improve oil recovery. , to achieve the effect of enhancing oil recovery and improving oil displacement efficiency

Active Publication Date: 2020-03-06
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

[0004] Generally speaking, the method of oil recovery is mainly to improve the sweep efficiency and oil washing efficiency. The conventional water injection well profile control is mainly to improve the sweep efficiency of injected water, and the effect of improving the oil washing efficiency is not obvious or not very good. approach, and thus cannot further enhance oil recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment takes the Liu 78-36 well group in Changqing Oilfield as an example for introduction. The crude oil recovery of the Liu 78-36 well group includes the following steps:

[0057] Step 1: Configure weak gel solution, cocamidopropyl beet with a concentration of 0.4% in the ratio of polyacrylamide: chromium acetate: resorcinol: ammonium chloride=0.15%: 0.20%: 0.015%: 0.03% Alkaline aqueous solution, b concentration of 0.3% cocamidopropyl betaine aqueous solution.

[0058] Step 2: The weak gel solution and cocamidopropyl betaine aqueous solution in step 1 are prepared before being injected into the oil well, including testing, well washing, pressure testing, and water test injection; wherein, the test is to take the water absorption indicator curve before construction, Pressure drop curve and other data; well flushing is to stop injection one day before construction, backwash the well until the water quality of the inlet and outlet is consistent; pressure test i...

Embodiment 2

[0069] This embodiment takes the Jiang 310-09 well group in the Luo 228 area of ​​Changqing Oilfield as an example to introduce. The crude oil recovery of the Jiang 310-09 well group in the Luo 228 area includes the following steps:

[0070] Step 1: Prepare a weak gel solution, a concentration of 1.0% cocamidopropyl di Betaine aqueous solution, b concentration of 0.9% cocamidopropyl betaine aqueous solution.

[0071] Step 2: Preparations before injection of the weak gel solution and cocamidopropyl betaine aqueous solution in step 1 into oil wells, including testing, well washing, pressure testing, and water test injection; among them, the testing is the pre-construction 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 p...

Embodiment 3

[0082] This embodiment is introduced by taking Jiang 310-03 well and group in Luo 228 area of ​​Changqing Oilfield as an example. The crude oil recovery of Jiang 310-03 well in Luo 228 area includes the following steps:

[0083] Step 1: Configure weak gel solution, cocamidopropyl beet with a concentration of 0.6% in the ratio of polyacrylamide: chromium acetate: resorcinol: ammonium chloride=0.15%: 0.20%: 0.015%: 0.03% Alkaline aqueous solution, b concentration of 0.5% cocamidopropyl betaine aqueous solution.

[0084] Step 2: The weak gel solution and cocamidopropyl betaine aqueous solution in step 1 are prepared before being injected into the oil well, including testing, well washing, pressure testing, and water test injection; wherein, the testing is to take the water absorption indicator curve before construction, Pressure drop curve and other data; well flushing is to stop injection one day before construction, backwash the well until the water quality of the inlet and out...

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Abstract

The invention provides a method for improving the recovery rate of crude oil in an oil well. The crude oil in the oil well is recovered by using an oil displacement agent formed from a polymer and a surfactant, wherein the surfactant is cocoamidopropyl betaine; and the polymer is a weak gel formed by performing cross-linking on one polymer, two organic cross-linking agents and one polycoagulant agent, wherein one polymer is polyacrylamide, the two organic crosslinking agents are chromium acetate and resorcinol, and the polycoagulant is ammonium chloride. A recovery method of the crude oil in the oil well comprises the following ten steps: preparation of the polymer and the surfactant, preparation work before crude oil recovery, primary injection on water and a weak gel solution, secondaryinjection, tertiary injection, injection of the surfactant solution, a step of driving the weak gel solution and the surfactant solution to an oil displacement zone, forward and reverse injection andthe like. The method for improving the recovery rate of the crude oil in the oil well can increase water viscosity, reduce a water-oil mobility ratio, inhibit water fingering and flooding, reduce oil-water interface tension, improve wettability, and reduce water injection well pressure, thereby improving the recovery rate of the crude oil.

Description

technical field [0001] The invention relates to the technical field of crude oil recovery, in particular to a method for increasing the recovery rate of crude oil in an oil well. 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 recovery factor. The level of recovery is related to many factors, not only related to natural conditions such as reservoir lithology, physical properties, heterogeneity, flui...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588C09K8/60C09K8/88E21B43/22
CPCC09K8/584C09K8/588C09K8/602C09K8/887C09K8/882E21B43/16
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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