Surfactant/polymer water repellent identification composite oil displacement agent and preparation method thereof

A technology of surfactant and combined oil displacement, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of loss, surfactant is easy to be absorbed by the formation, and the synergistic effect is not obvious, so as to achieve friction Increased effect

Inactive Publication Date: 2011-10-05
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Although in theory the surfactant oil displacement agent can play the role of "washing oil" and the polymer oil displacement agent can play a synergistic effect of "oil displacement", but due to the existence of surfactants that are easily absorbed by the formation and the viscosity of the polymer in the formation Disadvantages such as loss, its synergistic effect is not obvious

Method used

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  • Surfactant/polymer water repellent identification composite oil displacement agent and preparation method thereof

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preparation example Construction

[0012] The preparation method of grafted cyclodextrin acrylamide polymer comprises the following steps.

[0013] Add 6mL of acrylamide (AM) with a concentration of 0.5g / mL and a concentration of 3mL of 0.5g / mL acrylic acid, the molar ratio of acrylamide, acrylic acid and allyl cyclodextrin or maleic anhydride modified cyclodextrin or acrylic acid modified cyclodextrin is 69.2~84.2:30~15: 0.8; then add 1 mL of 0.5 g / mL disodium edetate chelating agent, 1 mL of 0.5 g / mL potassium persulfate oxidizing agent and 0.5 mL of 1.0 g / mL sodium bisulfite reducing agent ; After mixing evenly, fill with nitrogen gas for 20-40 minutes to remove oxygen, then react at 30-50°C for 6-8 hours, neutralize the pH with NaOH solution to 6-7, and obtain grafted cyclodextrin acrylamide polymer;

Embodiment 1

[0015] Take 1 mL of cetyltrimethylammonium chloride solution with a concentration of 800 mg / L and a grafted cyclodextrin acrylamide polymer (R 1 for CH 2 , R 2 is Na, the molar percentage of X is 5%, and the molar percentage of Y is 8%) 300mL are mixed, stirred for 36 hours, and the stirring temperature is 40°C. A surfactant / polymer hydrophobic recognition composite oil displacement agent is obtained. The simulated core displacement test results show that the oil recovery rate is 87.2%;

Embodiment 2

[0019] Take the concentration of 800mg / L sodium dodecylbenzenesulfonate solution 1mL and the concentration of 1200mg / L grafted cyclodextrin acrylamide polymer (R 1 for CH 2 , R 2 is Na, the molar percentage of X is 5%, and the molar percentage of Y is 8%) 300mL are mixed, stirred for 36 hours, and the stirring temperature is 40°C. A surfactant / polymer hydrophobic recognition composite oil displacement agent is obtained. The simulated core displacement test results show that the oil recovery rate is 92.1%;

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Abstract

The invention relates to a surfactant / polymer water repellent identification composite oil displacement agent for improving the mining rate of crude oil in an oil field and a preparation method of the oil displacement agent. The oil displacement agent can be used for oil displacement in a cooperation way, has water repellent and identification functions and cannot be adsorbed by stratum. In the technical scheme, the composite oil displacement agent comprises the following raw materials and components in percentage by mass: 2.7*10<-4> percent of surfactant which is one of sodium dodecyl benzene sulfonate, cetyltrimethylammonium chloride or nonyl phenol poly ethoxylate polyoxyethylene ether, and 1.2*10<-3> percent of polymer which is prepared by mixing allyl cyclodextrin or maleic anhydridemodified cyclodextrin with acrylamide and acrylic acid according to a certain proportion by using grafted cyclodextrin acrylamide, adding chelates, potassium persulfate and sodium hydrosulfite into the mixture, introducing nitrogen for oxygen removal and reacting for 6 to 8 hours. The preparation method comprises the following steps of: preparing solution by using the surfactant and the polymer respectively; mixing according to the volume ratio of 1 to 300; and stirring at the temperature of between 30 and 40 DEG C for 12 to 48 hours to obtain the composite oil displacement agent. The composite oil displacement agent has a good oil displacement effect, can improve the mining rate of the crude oil and can be used as an oil displacement agent in the oil field.

Description

technical field [0001] The invention relates to a surfactant / polymer hydrophobic recognition composite oil displacement agent used for improving crude oil recovery rate in oilfields of petroleum enterprises and a preparation method thereof. technical background [0002] In order to increase the recovery rate of crude oil in oil fields, oil displacement agents are often used, and a single oil displacement agent is often used. Composite oil-displacement agents generally refer to any two or more combinations of oil-displacement agents such as polymer oil-displacement agents, surfactant oil-displacement agents, alkali oil-displacement agents, and biological oil-displacement agents. Although in theory surfactant oil displacement agent can play a role in "washing oil" and polymer oil displacement agent can play a synergistic effect of "oil displacement", due to the existence of surfactants that are easily absorbed by the formation and the viscosity of polymers in the formation Sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/588C09K8/584
Inventor 邹长军邢钰崔婵婵吴丹胡绪则肖朴夫李蒙
Owner SOUTHWEST PETROLEUM UNIV
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