CN1296115A - Oil-producing method using ether carboxylate as oil displacement system - Google Patents
Oil-producing method using ether carboxylate as oil displacement system Download PDFInfo
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- CN1296115A CN1296115A CN 00129383 CN00129383A CN1296115A CN 1296115 A CN1296115 A CN 1296115A CN 00129383 CN00129383 CN 00129383 CN 00129383 A CN00129383 A CN 00129383A CN 1296115 A CN1296115 A CN 1296115A
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- oil
- displacement system
- oil displacement
- ether carboxylate
- ether
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Abstract
The present invention relates to an oil production method in which ether and carboxylate are used as oil displacement system, and is characterized by utilizing synthesis of nonionic-anionic ampho-surfactant carboxylate and adopting ether carboxylate and petroleum sulfonate to form the invented new type oil displacement system through a certain compounding process according to a certain ratio so as to raise recover rate of crude oil.
Description
The present invention relates to a kind ofly with the oil production method of ether carboxylate as oil displacement system, it is the improvement that belongs to the Oil-Gas Field Development Engineering oil recovery technique.It mainly is the ether carboxylate by synthetic nonionic-anionic amphoteric surfactant, and with ether carboxylate and the composite formation oil displacement system of petroleum sulfonate, to reach the purpose that improves oil recovery factor.
In Oil-Gas Field Development Engineering, utilizing surfactant flooding is a kind of chemical displacement of reservoir oil method of important raising oil recovery factor, and this method just more and more comes into one's own.At high temperature, high water salinity oil reservoir, independent nonionic or anionic surfactant all can not satisfy the requirement of the displacement of reservoir oil, because there is cloud point in nonionic surface active agent, formation temperature is higher than cloud point, and surfactant promptly begins to separate out from water.Anionic surfactant is salt tolerant not then, and formation water salinity is too high, and surfactant will be precipitated out from water.Promptly precipitate in 2% sodium chloride brine as present most popular anionic surfactant petroleum sulfonate.
Purpose of the present invention provides a kind of with the oil production method of ether carboxylate as oil displacement system with regard to being to avoid above-mentioned the deficiencies in the prior art part, it is that non-ionic group and anionic group are designed simultaneously in a surfactant molecule structure, and then forming the novel surfactant of a class is nonionic-anionic amphoteric surfactant.This surfactant had both kept the advantage of nonionic, anionic surfactant, had overcome shortcoming separately again, was the surfactant of a class function admirable, and ether carboxylate promptly belongs to this type of.Therefore, the present invention just with ether carboxylate as oil displacement system, its major technology characteristics are that oil displacement system is that ether carboxylate and petroleum sulfonate by nonionic-anionic amphoteric surfactant forms in 1: 0.25～4 ratio is composite, and can add a certain amount of alkali as requested in oil displacement system.
In order to realize above-mentioned purpose of the present invention better, designer of the present invention is synthetic like this ether carboxylate: with the polyoxyethylene nonylphenyl ether is raw material, by the synthetic ether carboxylate of carboxymethylation reaction, its reaction condition is: reaction temperature is 30 ℃, do time in advance is 15～30 minutes, reaction time: 6～8 hours, the mol ratio of monoxone and polyoxyethylene nonylphenyl ether was 1.25, and the mol ratio of NaOH and polyoxyethylene nonylphenyl ether is 2.25.
In order to obtain better oil displacement efficiency, also can be as required in oil displacement system, add an amount of alkali, this alkali can be sodium carbonate, sodium acid carbonate or NaOH, the weight ratio of its concentration can be 1～3%.
Come enumeration design philosophy of the present invention and design advantage below in conjunction with embodiment.In actual design with in implementing, designer of the present invention utilizes the good ether carboxylate of salt resistant character can improve these characteristics of salt tolerance of petroleum sulfonate, it is composite to select a kind of ether carboxylate and petroleum sulfonate to carry out, make the salt resistant character of oil displacement system strengthen, shown and to have adjusted the salt resistant character that mixes oil displacement system by regulating compound proportion with the increase of the compound proportion of ether carboxylate.Again because the existing cooperative effect of interfacial tension of ether carboxylate and petroleum sulfonate compound system is particularly suitable for the displacement of reservoir oil of high salinity stratum, be higher than under 2% salt content soluble salt content of petroleum sulfonate (promptly greater than), the composite equal interfacial tension of system that can make of any ratio reaches minimum, and the minimum basically identical.With the increase of ether carboxylate compound proportion, the also corresponding increase of salt content scope of ultralow interfacial tension correspondence appears just.Therefore, only need just can make ether carboxylate and petroleum sulfonate make the oil displacement agent on different high water salinities stratum by regulating compound proportion.Below two embodiment proved absolutely above-mentioned effect of the present invention.1. imitation oil displacement experiment test effect
In order to investigate ether carboxylate and the petroleum sulfonate compound system oil displacement efficiency in high water salinity stratum, selected a kind of Simulation of Crude Oil, carried out oil displacement test.This Simulation of Crude Oil is under 60 ℃, and density is 0.82gcm
-3, viscosity is 3.833mPas, and moisture content is 0, and acid number is a 0.386mgKOH/g oil.After measured, 0.2% mixed surfactants solutions (the composite mass ratio of ether carboxylate and petroleum sulfonate is 1: 4) is 70000mgL with Simulation of Crude Oil in salinity
-1Can reach ultralow interfacial tension when (regulating) with sodium chloride.Therefore, formation water selection salinity is 70000mgL
-1Sodium chloride brine, the surfactant solution in the imitation oil displacement experiment test is also prepared with formation water.
Oil displacement test is the result show, ether carboxylate and petroleum sulfonate compound system have fairly obvious oil displacement efficiency, continues water drive behind the surfactant slug of injection 0.1Vp, and the recovery ratio increment reaches 34%.And under the same conditions, independent NPC-9 and petroleum sulfonate then only are respectively 22% and 13%.2. field conduct effect
The oil well chemical that the present invention relates to carry out in the high water salinity block in oil field, two factory Pu cities is recovered the oil in the Zhongyuan Oil Field is handled up.This test block oil reservoir buried depth 2388～2404m, 86～87 ℃ of formation temperatures, formation water salinity 25 * 10
4～28 * 10
4MgL
-1(belonging to typical high water salinity oil reservoir).Use ether carboxylate year December December to 1997 nineteen ninety-five and implement the single well chemical huff and puff oil recovery for the first type surface activating agent on 15 mouthfuls of oil wells, add up incremental oil production 6000t in by the end of June, 98,4,500,000 yuan of the profits of making a profit have obtained remarkable economic efficiency and social benefit.
Because oil displacement system of the present invention is that high temperature, high salinity stratum are had unique effect, be general chemical technology of reservoir sweep can't be obtained.Therefore, in Oil-Gas Field Development Engineering, has great popularizing application prospect.
Claims (5)
1. one kind with the oil production method of ether carboxylate as oil displacement system, it mainly is to use nonionic-anionic amphoteric surfactant at oil displacement system, it is characterized in that oil displacement system is that ether carboxylate and petroleum sulfonate by nonionic-anionic amphoteric surfactant forms in 1: 0.25～4 ratio is composite, and can in oil displacement system, add an amount of alkali as requested.
2. according to claim 1 a kind of with the oil production method of ether carboxylate as oil displacement system, it is characterized in that described ether carboxylate synthetic be to be raw material with the polyoxyethylene nonylphenyl ether, by the synthetic ether carboxylate of carboxymethylation reaction, its reaction condition is as follows:
Reaction temperature: 30～50 ℃
Do time in advance: 15～30 minutes
Reaction time: 6～8 hours
The mol ratio of monoxone and polyoxyethylene nonylphenyl ether: 1.25
The mol ratio of NaOH and polyoxyethylene nonylphenyl ether: 2.25
3. according to claim 1 a kind of with the oil production method of ether carboxylate as oil displacement system, it is characterized in that adding an amount of alkali in oil displacement system can be sodium carbonate, the weight ratio of its concentration can be 1～3%.
4. according to claim 1 a kind of with the oil production method of ether carboxylate as oil displacement system, it is characterized in that adding an amount of alkali in oil displacement system can be sodium acid carbonate, the weight ratio of its concentration can be 1～3%.
5. according to claim 1 a kind of with the oil production method of ether carboxylate as oil displacement system, it is characterized in that adding an amount of alkali in oil displacement system can be NaOH, the weight ratio of its concentration can be 1～3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00129383 CN1276909C (en) | 2000-12-05 | 2000-12-05 | Oil-producing method using ether carboxylate as oil displacement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00129383 CN1276909C (en) | 2000-12-05 | 2000-12-05 | Oil-producing method using ether carboxylate as oil displacement system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1296115A true CN1296115A (en) | 2001-05-23 |
| CN1276909C CN1276909C (en) | 2006-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00129383 Expired - Fee Related CN1276909C (en) | 2000-12-05 | 2000-12-05 | Oil-producing method using ether carboxylate as oil displacement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100558454C (en) * | 2006-07-20 | 2009-11-11 | 中国科学院理化技术研究所 | Straight chain alkyl phenol homogeneity polyethenoxy ether acetic acid surfactant and preparation method thereof and purposes |
| CN104232044A (en) * | 2013-06-17 | 2014-12-24 | 中国石油化工股份有限公司 | Composite surface active agent composition for tertiary oil recovery and preparation method and application thereof |
-
2000
- 2000-12-05 CN CN 00129383 patent/CN1276909C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100558454C (en) * | 2006-07-20 | 2009-11-11 | 中国科学院理化技术研究所 | Straight chain alkyl phenol homogeneity polyethenoxy ether acetic acid surfactant and preparation method thereof and purposes |
| CN104232044A (en) * | 2013-06-17 | 2014-12-24 | 中国石油化工股份有限公司 | Composite surface active agent composition for tertiary oil recovery and preparation method and application thereof |
| CN104232044B (en) * | 2013-06-17 | 2017-08-11 | 中国石油化工股份有限公司 | Surface activator composition, preparation method and application for tertiary oil recovery |
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| Publication number | Publication date |
|---|---|
| CN1276909C (en) | 2006-09-27 |
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