Polymer-surfactant binary compound oil displacement method

A technology of binary compound and oil displacement method, which is applied in the direction of chemical instruments and methods, earthwork drilling and production, and drilling composition, etc. It can solve the problems of alkali corrosion, poor oil displacement efficiency and high use concentration in ASP flooding , to achieve the effect of strong ability to reduce interfacial tension, excellent performance, and easy biodegradation

Active Publication Date: 2011-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the oil displacement agent containing surfactant in the prior art has poor oil displacement efficiency under high temperature and high salt

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] (a) Synthesis of N, N-dilauroyl ethylenediamine dimethyl propionic acid

[0034] 300 grams (1.5 moles) of lauric acid, 267.8 grams (2.25 moles) of thionyl chloride and 4.5 grams of DMF were added to a 1000-milliliter four-necked flask equipped with a sealed mechanical stirrer, a thermometer, a condenser tube, etc., and reacted at 90 ° C for 3 After one hour, excess thionyl chloride was distilled off under reduced pressure to obtain lauroyl chloride. Add 45.0 grams (0.75 moles) of anhydrous ethylenediamine and 180 grams of 1,4-dioxane to another 2000 ml four-neck flask equipped with a sealed mechanical stirrer, a thermometer, and a condenser tube, heat up to 50° C., and slowly Add 165.0 grams (1.65 moles) of methyl methacrylate dropwise, continue the reaction for 3 hours after dropping, remove unreacted methyl methacrylate and solvent 1,4-dioxane under reduced pressure, and the residue is ethylenediamine dioxane. Methyl methpropionate. Use 50wt% sodium hydroxide to adj...

Embodiment 2

[0042] (a) Synthesis of N, N-dilauroyl hexamethylenediamine dimethylpropionic acid

[0043] With [Example 1] (a), the difference replaces 45.0 grams (0.75 moles) of anhydrous ethylenediamine with 87.0 grams (0.75 moles) of anhydrous hexamethylenediamine, and the rest are the same to obtain N, N-dilauroyl Hexamethylenediamine dimethyl propionic acid 328.6 grams, molar yield 67.2%.

[0044] (b) Synthesis of N,N-dilauroylhexamethylene diamine dimethyl propionate dipolyoxyethylene ether (n=3)

[0045] With [Example 1] (b), the difference is 328.6 grams (0.504 moles) of N, N-dilauroyl hexamethylenediamine dimethyl propionic acid instead of 306.2 grams (0.514 moles) of N, N-didodecanoic acid The consumption of acyl ethylenediamine dimethyl propionic acid and oxirane is 133.1g (3.024 moles), and the consumption of the basic compound of calcium is 7.5 grams to obtain N, N-dilauroyl hexamethylene diamine Dipolyoxyethylene methpropionate (n=3) was 409.5 grams, and the molar yield was ...

Embodiment 3

[0051] (a) Synthesis of N, N-didecanoyl butanediamine dimethylpropionic acid

[0052] With [Example 1] (a), the difference replaces 300.0 grams (1.5 moles) of lauric acid with 261.0 grams (1.5 moles) of capric acid, and replaces 45.0 grams (0.75 grams) of anhydrous butanediamine with 66.0 grams (0.75 moles). mol) anhydrous ethylenediamine, and the rest are the same to obtain 283.3 grams of N, N-didecanoyl butanediamine dimethylpropionic acid, and the molar yield is 66.5%.

[0053] (b) Synthesis of N, N-didecanoyl butanediamine dimethyl propionate dipolyoxyethylene ether (n=3)

[0054] With [Example 1] (b), the difference is 283.3 grams (0.499 moles) of N, N-didecanoyl butanediamine dimethyl propionic acid instead of 306.2 grams (0.514 moles) of N, N-dilauroyl The consumption of ethylenediamine dimethylpropionic acid and oxirane is 131.7g (2.994 moles), and the consumption of the basic compound of calcium is 6.4 grams to obtain N, N-didecanoyl butanediamine dimethyl Dipolyoxy...

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Abstract

The invention relates to a polymer-surfactant binary compound oil displacement method, which mainly solves the problems of low oil displacement efficiency and high using concentration of a surfactant-containing oil displacement agent under high temperature and high salt conditions in the prior art and the corrosion and scale deposition of a formation and an oil well due to alkali in alkali-surfactant-polymer compound flooding. By the polymer-surfactant binary compound oil displacement method, underground dehydrated crude oil is contacted with an oil displacement composition and crude oil in arock core is fully displaced under the conditions that the oil displacement temperature is more than or equal to 85 DEG C, the total mineralization of formation water is more than or equal to 16,000mg/L, and the total content of Ca<2+> and Mg<2+> in the formation water is more than or equal to 450mg/L, wherein the oil displacement composition comprises the following components in percentage by mass: (1) 0.01 to 5.0 percent of N,N-difatty acyl diamine dimethylpropanoic acid dipolyoxyethylene ether disulfonate, (2) 0.01 to 3.0 percent of polymer, and (3) 92.0 to 99.98 percent of formation water. Through the technical scheme, the problems are well solved, and the method can be used for the tertiary oil recovery production of an oil field.

Description

technical field [0001] The invention relates to a poly-surface binary compound flooding method. Background technique [0002] With the development of society and economy, people's demand for oil continues to increase and oil reserves decrease, and oil, as a non-renewable resource, is becoming more and more valuable. The problems we are facing are: first, the contradiction between supply and demand is prominent, the demand for oil is getting bigger and bigger, and new oil fields are getting fewer and fewer; second, there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can produce 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, primary oil recovery and secondary oil recovery only produce 25-50% of underground crude oil. In order to ensure the long-term stable supply of oil and meet the needs of human beings, it is necessary to research and develop enhan...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/584C09K8/588
CPCC09K8/584C09K8/588
Inventor 沈之芹翟晓东张卫东唐恒志
Owner CHINA PETROLEUM & CHEM CORP
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