Oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery

An oil displacement agent and recovery factor technology, which is applied in the construction of a polymer-surfactant pure binary oil displacement system for enhanced oil recovery in the third oil recovery. It can improve the oil recovery rate, reduce the production cost, and have good environmental protection effects.

Inactive Publication Date: 2010-03-10
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of alkali causes the precipitation of multivalent ions, the dissolution of rock minerals, destroys the oil layer and oil well structure, and seriously damages the formation; at the same time, the pump barrel needs to be cleaned every 10-15 days, which increases the cost of oil production; Increasing the amount of polymer used will greatly reduce the viscoelasticity of the polymer, especially the elasticity of the polymer; in addition, the use of alkali also causes the production fluid to be a high-viscosity W / O emulsion, which affects oil wells. production capacity, which increases the difficulty of demulsification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Polyacrylamide 18.0g, sodium dodecylbenzene sulfonate 3.0g, gemini surfactant 2.0g, alkylphenol polyoxyethylene ether 5.0g, alkylphenol polyoxyethylene ether sodium 10.0g, methanol 15.0g and 10,000g of clean water were added to a mixer equipped with a stirring device, and stirred at room temperature for 2.0h to prepare an oil displacing agent.

[0035] At a temperature of 80°C and a salinity of 25000mg / L (Ca 2+ +Mg 2+ =552mg / L), DV-II type Brookfield viscometer (UL connector) is at 30 rev / min conditions, and the recorded viscosity is 16.5mPa.S; Use TX-500C interfacial tensiometer, at rotational speed 5000 rev / min conditions , the lowest interfacial tension is 2.6×10 -3 mN / m.

Embodiment 2

[0037] 16.0g of modified polyacrylamide, 2.0g of carboxylic betaine betaine, 2.0g of fatty alcohol polyoxyethylene ether, 3.0g of sulfoimidazoline betaine, 6.0g of sodium alkylphenol polyoxyethylene ether sulfonate, ethanol 13.0g, 10000g of clean water (or reinjected sewage) were added to a mixer equipped with a stirring device, and stirred at room temperature for 2.5h. Prepare oil displacing agent.

[0038] At a temperature of 80°C and a salinity of 25000mg / L (Ca 2+ +Mg 2+ =552mg / L), DV-II type Brookfield viscometer (UL connector) is at 30 rev / min conditions, and the recorded viscosity is 17.5mPa.S; Use TX-500C interfacial tensiometer, at rotational speed 5000 rev / min conditions , the lowest interfacial tension is 3.1×10 -3 mN / m.

Embodiment 3

[0040] Add 15.0g of xanthan gum, 3.0g of sodium dodecylbenzenesulfonate, 6.0g of petroleum carboxylate, 1.5g of carboxybetaine, 2.0g of sulfoimidazoline betaine, 16.0g of methanol, and 10,000g of clear water into the container In a mixer with a stirring device, stir at room temperature for 2.5h. Prepare oil displacing agent.

[0041] At a temperature of 80°C and a salinity of 25000mg / L (Ca 2+ +Mg 2+=552mg / L), the DV-II type Brookfield viscometer (UL connector) is at 30 rev / min conditions, and the recorded viscosity is 12.5mPa.S; Use TX-500C interfacial tensiometer, at rotational speed 5000 rev / min conditions , the lowest interfacial tension is 5.0×10 -3 mN / m.

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Abstract

The invention relates to an oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery and a preparation method thereof, belonging to the technical field of intensified oilproduction in oil fields. The surface active agent used in the invention comprises following components in percentage by weight: 0.01-0.3 percent of water soluble high molecular polymer, 0-20 percentof non-ionic surface active agent, 5-65 percent of anion active agent, 0-5 percent of ampholytic active agent, 0.01-1.5 percent of additive and the balance of water. The oil-displacing agent and the polymer are based on a novel intensified oil displacing system which has complementary structure and good compatibility and is obtained by various associations and the interaction among molecules. Thesystem has the performances of high temperature resistance, salt resistance, higher viscosity, ultralow interfacial tension, and the like, is in accordance with the environmental requirement and can obviously enhance the oil recovery efficiency of oil fields after being used for oil-displacing.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to the construction of a polymer-surfactant pure binary oil displacement system for enhanced oil recovery in the third petroleum recovery. More specifically, it is a binary oil displacement agent used for tertiary oil recovery to enhance oil recovery. Background technique [0002] Traditional oil extraction is divided into three stages: the primary oil recovery is to spray crude oil to the ground by formation pressure, and the recovery rate reaches about 15% of the crude oil reserves; the secondary oil recovery is to maintain the pressure by artificial water injection to further extract crude oil. The recovery factor is about 25%. After the primary and secondary exploitation of underground crude oil, there are still a large amount of crude oil (40-60%) adsorbed in the rock formation voids and it is difficult to exploit with the above two methods. Therefore, other phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584
CPCC09K8/588
Inventor 刘凯王娟
Owner TIANJIN NORMAL UNIVERSITY
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