Betaine-polymer oil displacement composition and preparation method thereof

A technology of polymer and betaine, which is applied in drilling compositions, chemical instruments and methods, and earthwork drilling and production, can solve problems such as formation and oil well damage, poor oil displacement efficiency, corrosion equipment and pipelines, etc., and achieve The effect of good technical effects

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the oil displacement composition containing surfactant in the prior art has poor oil displacement efficiency under high temperature and h...

Method used

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  • Betaine-polymer oil displacement composition and preparation method thereof
  • Betaine-polymer oil displacement composition and preparation method thereof
  • Betaine-polymer oil displacement composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation of betaine surfactant

[0028] a) Add octadecyl primary amine (1 mol) to a reactor equipped with a condensing device and a stirring device, and when heating to 150°C while blowing nitrogen, add ethylene oxide (2 mol) after heating for 40 minutes, The temperature was maintained at 155°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, and then use nitrogen to blow 4 times to remove the air in the system, and then adjust the reaction temperature of the system to Slowly feed ethylene oxide (4 moles) at 165°C, and control the pressure <0.80MPa for alkoxylation until the end of the reaction. After cooling, use oxalic acid to neutralize, filter, and dehydrate to obtain octadecyl polyoxyethylene ( n+m=6) ether tertiary amine. Wherein the consumption of barium hydroxide is 0.5wt% of octadecyl primary amine and ethylene oxide weight. ...

Embodiment 2

[0040] 1. Preparation of betaine surfactant

[0041] a) Add octadecyl primary amine (1 mol) to a reactor equipped with a condensing device and a stirring device, and when heating to 150°C while blowing nitrogen, add ethylene oxide (2 mol) after heating for 40 minutes, The temperature was maintained at 155°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, and then use nitrogen to blow 4 times to remove the air in the system, and then adjust the reaction temperature of the system to Slowly feed ethylene oxide (1 mole) at 165°C, and control the pressure <0.80MPa to carry out alkoxylation reaction until the end of the reaction. After cooling, use oxalic acid to neutralize, filter, and dehydrate to obtain octadecyl polyoxyethylene ( n+m=3) ether tertiary amine. Wherein the consumption of barium hydroxide is 0.5wt% of octadecyl primary amine and ethyle...

Embodiment 3

[0047] 1. Preparation of betaine surfactant

[0048] a) Add octadecyl primary amine (1 mol) to a reactor equipped with a condensing device and a stirring device, and when heating to 150°C while blowing nitrogen, add ethylene oxide (2 mol) after heating for 40 minutes, The temperature was maintained at 155°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, and then use nitrogen to blow 4 times to remove the air in the system, and then adjust the reaction temperature of the system to Slowly feed ethylene oxide (6 moles) at 165°C, and control the pressure <0.80MPa to carry out alkoxylation reaction until the end of the reaction. After cooling, use oxalic acid to neutralize, filter, and dehydrate to obtain octadecyl polyoxyethylene ( n+m=8) ether tertiary amine. Wherein the consumption of barium hydroxide is 0.5wt% of octadecyl primary amine and ethy...

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Abstract

The invention relates to an alkyl betaine surfactant composition for tertiary oil recovery, and a preparation method thereof. The problems of bad oil displacement efficiency, high use concentration, and corrosion and incrustation damages of alkalis in alkaline-surfactant-polymer flooding to stratums and oil wells of an oil displacement composition containing routine surfactants in high-temperature and high-salinity oil reservoirs, especially stratum water containing HCO3<-> in the prior art are mainly solved. The oil displacement composition for tertiary oil recovery comprises 1 part by weight of a betaine surfactant and 0.01-10 parts by weight of a polymer, wherein the molecular general formula of the betaine surfactant is shown in the specification; in the formula, R is a C8-C30 alkyl group, R' is a C1-C6 alkylidene group, and a value of n+m is 2-100; and the polymer is one selected from ultrahigh molecular weight polyacrylamide, a temperature and salt resistant polymer A and xanthan gum. The composition well solves the problems, and can be used in the tertiary oil recovery of oilfields.

Description

technical field [0001] The invention relates to a betaine-polymer composition for tertiary oil recovery and a preparation method. Background technique [0002] The main oilfields in my country have entered a high water cut period after primary and secondary recovery. How to improve oil recovery and maximize the development of remaining reserves, tertiary oil recovery technology has played a very important role in ensuring stable and high production of oil fields. Among new technologies for tertiary oil recovery, chemical composite flooding is still one of the most promising methods. [0003] After the oil field enters the high water cut period, the remaining oil is trapped in the pores of the reservoir rocks as a discontinuous oil film, and the two main forces acting on the oil droplets are viscous separation and capillary force. If an appropriate surfactant system is used to reduce the interfacial tension between oil and water, the resistance caused by the deformation of o...

Claims

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Application Information

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IPC IPC(8): C09K8/584B01F17/42E21B43/22C09K23/42
CPCC09K8/584C09K8/588
Inventor 王辉辉李应成沙鸥沈之芹吴国英李斌
Owner CHINA PETROLEUM & CHEM CORP
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