Chemical flooding injection method for improving recovery rate of crude oil

A chemical flooding and recovery technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of alkali agent consumption increasing the cost of oil extraction, restricting the promotion and application of industrialization, and damage to formations and oil wells. Achieve the effect of enhancing oil recovery, increasing swept volume, and avoiding damage

Inactive Publication Date: 2012-04-18
孙安顺
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Problems solved by technology

However, after polymer flooding, there is still a large amount of crude oil remaining in the formation, especially in the middle and low permeability layers, and some replacement technologies adopted after polymer flooding, such as: ASP flooding as a replacement technology after polymer flooding in Daqing Oilfield Field tests and applications have been carried out, and the results show that A

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  • Chemical flooding injection method for improving recovery rate of crude oil
  • Chemical flooding injection method for improving recovery rate of crude oil

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Embodiment Construction

[0007] The present invention is further described below in conjunction with specific embodiment:

[0008] Chemical flooding injection method for enhanced oil recovery: ① After polymer flooding, inject 0.3PV emulsifier slug with concentration of 1700mg / L; ②Reinject polymer with molecular weight of 25 million and concentration of 1500mg / L, concentration % (wt) surfactant binary compound slug 0.4PV. The emulsifier slug is composed of: functional polymer 1000mg / L, T-60 500mg / L, sodium tripolyphosphate 200mg / L, and water as the balance.

[0009] Chemical flooding injection method 2 for enhanced oil recovery: ① After polymer flooding, inject emulsifier slug 0.2PV with a concentration of 2250mg / L; % (wt) surfactant binary compound slug 0.4PV. The emulsifier slug is composed of: functional polymer 1500mg / L, OP-2 500mg / L, citric acid 250mg / L, and water as the balance.

[0010] Chemical flooding injection method three for enhanced oil recovery: ① inject 0.25PV emulsifier slug wit...

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Abstract

The invention discloses a chemical flooding injection method for improving recovery rate of crude oil. The method comprises the following steps of: (1) injecting 0.1 to 0.5 physical volume (PV) of 1,000 to 2,500 mg/L emulsifier plug after polymer flooding; and (2) injecting 0.2 to 0.5 PV of binary composite plug of 500 to 2,500 mg/L polymer with the molecular weight of 20 to 30 million and 0.1 to 0.3 weight percent surfactant. According to the chemical flooding injection method, the residual oil obtained after the polymer flooding is emulsified by injecting the emulsifier plug to form oil-in-water emulsion, and the oil-in-water emulsion is displaced by using binary composite flooding, so that the recovery rate of the crude oil is improved by over 20 percent.

Description

technical field [0001] The invention relates to an injection method of the chemical flooding part of enhanced crude oil recovery. Background technique [0002] In recent years, technologies such as polymer flooding, surfactant flooding and composite flooding have made remarkable achievements, and the technical level is becoming more and more mature. Polymer flooding technology, with its unique oil displacement mechanism that mainly focuses on improving the sweep efficiency and supplemented by improving the oil washing efficiency, can increase the recovery rate by more than 10% on the basis of water flooding. However, after polymer flooding, there is still a large amount of crude oil remaining in the formation, especially in the middle and low permeability layers, and some replacement technologies adopted after polymer flooding, such as: ASP flooding as a replacement technology after polymer flooding in Daqing Oilfield Field tests and applications have been carried out, and ...

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Application Information

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IPC IPC(8): E21B43/22
Inventor 孙安顺
Owner 孙安顺
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