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Oil displacement composition containing betaine type surfactant and application thereof

A surfactant and composite surfactant technology, applied in the field of chemical flooding formula system, can solve the problems of high technical and economic risks, and the basic research of binary compound flooding needs to be strengthened, so as to achieve enhanced recovery, good adsorption and stable performance , Excellent oil displacement performance

Active Publication Date: 2012-10-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, binary compound flooding also has obvious unfavorable factors, including: the recovery rate of binary flooding is smaller than that of ASP flooding; To achieve low (ultra-low) interfacial tension, and the system needs to have good adsorption and stability; there are few successful field tests of binary flooding, and the technical and economic risks are still relatively large; the basic research of binary compound flooding needs to be strengthened

Method used

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  • Oil displacement composition containing betaine type surfactant and application thereof
  • Oil displacement composition containing betaine type surfactant and application thereof
  • Oil displacement composition containing betaine type surfactant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1 Synthesis and identification of betaine type surfactants and aryl alkyl alcohol polyoxyethylene ether nonionic surfactants

[0091] The detailed reaction steps of betaine surfactants are as follows:

[0092] (1) Esterification reaction: mix oleic acid and methanol (excess methanol), add catalyst concentrated sulfuric acid or p-toluenesulfonic acid, and heat to reflux for 10 hours. Cool, neutralize with sodium methoxide to a pH of 8-9, wash with water to neutrality, dry with anhydrous calcium chloride and distill under reduced pressure to obtain methyl oleate;

[0093] (2) Fu's alkylation: Add meta-xylene and other organic proton acid catalysts (such as methanesulfonic acid) in a 2.5L sealed reactor, add dropwise at 115~120℃, 0.2MPa The reaction product methyl oleate of step (1) with 5 times the amount of substance, the dripping time is controlled at 6h, after the dripping is completed, the reaction is continued for 3h. Static stratification, the lower catalyst deco...

Embodiment 2

[0113] Example 2 Determination of dynamic interfacial tension of oil-water in Daqing Oilfield No. 1 Plant by a formulation system containing betaine surfactants and aryl alkyl alcohol polyoxyethylene ether nonionic surfactants

[0114] Polyacrylamide HPAM, produced by Daqing Refining & Chemical Company, has a degree of hydrolysis of about 20% and an average molecular weight of 19 million.

[0115] The interfacial tension test adopts TEXAS-500C rotating drop interfacial tension meter, the interfacial tension test temperature is 45℃, the interfacial tension test time is 2 hours, and the crude oil from Daqing No. 1 Factory.

[0116] Formula system containing betaine surfactant and aryl alkyl alcohol polyoxyethylene ether nonionic surfactant: composite surfactant 0.025%~0.3%, polymer HPAM 0.15%, and the rest is injection water from Daqing No. 1 Plant ;

[0117] Among the composite surfactants,

[0118] Betaine type surfactants are

[0119] m+n=15;

[0120] Aryl alkyl alcohol polyoxyethylene...

Embodiment 3

[0124] Example 3 Determination of the emulsification performance of the formulation system containing betaine surfactants and alkyl alcohol polyoxyethylene ether nonionic surfactants on the oil and water of the No. 1 and No. 6 plants of Daqing Oilfield

[0125] Polyacrylamide HPAM, produced by Daqing Refining & Chemical Company, has a degree of hydrolysis of about 20% and an average molecular weight of 19 million.

[0126] Emulsification performance test method: Put the binary system to be tested and crude oil 1:1 volume ratio in a test tube with a stopper, use a homogenizer to emulsify (rotate at 10000rpm) for 1 min, and determine the final water separation rate as a preliminary index for evaluating emulsification performance. The actual emulsification effect of Bailey core flooding experiment is used to evaluate the emulsification performance.

[0127] Formula system containing betaine surfactant and aryl alkyl alcohol polyoxyethylene ether nonionic surfactant: composite surfactant...

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Abstract

The invention provides an oil displacement composition containing a betaine type surfactant and application thereof, particularly application thereof in tertiary oil recovery. The oil displacement composition is composed of the following components: 1-30 parts by weight of a composite surfactant and 0-25 parts by weight of a polymer, wherein the composite surfactant is a combination of the betaine type surfactant (I) and an non-ionic surfactant (II) in a weight ratio of (10-90):(90-10): formula (I), wherein in the formula (I), m and n are integers from 0 to 19 but are equal to 0 asynchronously, R1 is H, C1-8 alkyl, phenyl or C1-8 alkyl phenyl, R3 is C1-8 alkyl, and R4 is C1-8 alkyl, and X is shown in the specification; and in the formula (II), R is H, C1-8 alkyl, phenyl or C1-8 alkyl phenyl, x and y are integers from 0 to 19 and are equal to 0 asynchronously, and z is an integer from 3 to 25.

Description

Technical field [0001] The present invention relates to a chemical flooding formula system used in tertiary oil recovery, in particular to an oil displacement composition containing a betaine type surfactant and its application in tertiary oil recovery. Background technique [0002] In recent years, with the deepening of the exploitation of the eastern oilfields, most of my country’s main waterflooding oilfields have been in the stage of high water cut and high recovery. It has become more and more difficult to adjust the old areas to increase recoverable reserves. The newly added recoverable reserves of the oilfields that year were low. In terms of oil production, storage and production are out of balance, but the average oil field recovery rate is only 32%. New technologies for enhanced oil recovery are urgently needed to maintain the growth and stability of crude oil production. [0003] The industrialization and application of polymer flooding in Daqing proved that chemical floo...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
Inventor 宋新民马德胜王红庄刘春德周朝辉
Owner PETROCHINA CO LTD
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