Oil displacing method for reservoirs with high temperature and salinity

A high-temperature, high-salt, oil-displacing technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problem of alkali corrosion, high use concentration, and poor oil-displacing efficiency in ASP flooding problems, to achieve the effect of reducing interfacial tension capacity, high salinity resistance, and excellent performance

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 conditions, high use concentration and corrosion and damage caused by alkali in ASP flooding to formation and oil well. Scale damage problem, providing a flooding method for high temperature and high salinity reservoirs

Method used

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  • Oil displacing method for reservoirs with high temperature and salinity
  • Oil displacing method for reservoirs with high temperature and salinity
  • Oil displacing method for reservoirs with high temperature and salinity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (a) Synthesis of N, N-dilauroyl ethylenediamine dipropionic acid

[0035] 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 141.9 grams (1.65 moles) of methyl acrylate dropwise, continue the reaction for 3 hours after dropping, remove unreacted methyl acrylate and solvent 1,4-dioxane under reduced pressure, and the residue is methyl ethylenediamine dipropionate . Use 50wt% sodium hydroxide to adjust the pH of the reactio...

Embodiment 2

[0043] (a) Synthesis of N, N-dilauroyl hexamethylene diamine dipropionic acid

[0044] 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 dipropionic acid 328.5 grams, molar yield 70.2%.

[0045] (b) Synthesis of N,N-dilauroylhexamethylene diamine dipropionic acid dipolyoxyethylene ether (n=3)

[0046] With [Example 1] (b), the difference is 328.5 grams (0.578 moles) of N, N-dilauroyl hexamethylene diamine dipropionic acid instead of 300.3 grams (0.529 moles) of N, N-dodecanoyl ethyl The usage amount of diamine dipropionic acid and ethylene oxide is 152.7g (3.470 moles), and the usage amount of the basic compound of calcium is 8.6 grams, get) N, N-dilauroyl hexamethylene diamine dipropionic acid di Polyoxyethylene ether (n=3) 446.0 g, molar yield 86.9%.

[0047] (c) Synthesis of N, N-dilauroyl...

Embodiment 3

[0052] (a) Synthesis of N, N-didecanoyl butanediamine dipropionic acid

[0053] 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 others are the same to obtain 285.2 grams of N,N-didecanoylbutylene diamine dipropionic acid, and the molar yield is 69.9%.

[0054] (b) Synthesis of N, N-didecanoyl butanediamine dipropionic acid dipolyoxyethylene ether (n=3)

[0055] With [Example 1] (b), the difference is 285.2 grams (0.524 moles) of N, N-didecanoyl butanediamine dipropionic acid instead of 300.3 grams (0.529 moles) of N, N-dilauroyl ethylene dipropionate The consumption of amine dipropionic acid and oxirane is 138.3g (3.144 mole), and the consumption of the basic compound of calcium is 6.7 grams, obtains N, N-didecanoyl butanediamine dipropionic acid dipolyoxyethylene...

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Abstract

The invention relates to an oil displacing method for reservoirs with high temperature and salinity, and mainly solves the problems that the oil displacing agent containing a surfactant in the prior art has poor displacement efficiency, high use concentration and corrosion and scale damage caused by bases in ASP (alkali surfactant polymer ) flooding to the formation and oil wells under the conditions of high temperature and salinity. Through the oil displacing method for reservoirs with high temperature and salinity provided by the invention, the crude oil in cores is fully displaced by contacting the underground dehydrated crude oil with a oil displacing composition under the formation water conditions of the oil displacing temperature greater than or equal to 85 DEG C, the total mineralization degree greater than or equal to 16000 mg/L and the total content of Ca<2+> and Mg<2+> greater than or equal to 450 mg/L, wherein the oil displacing composition comprises the following components in percentage by weight: (1) 0.01-5.0% of N,N-bisfatty acyl-diamine-dipropionate-dipolyoxyethylene ether dicarboxylate; (2) 0.01-3.0% a polymer; and (3) 92.0-99.98% of the formation water. The oil displacing method provided by the invention can solve the above problems in a better manner and can be used in tertiary oil recovery production of an oilfield.

Description

technical field [0001] The invention relates to an oil displacement method for high-temperature and high-salt oil reservoirs. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
Inventor 沈之芹吴国英李斌王辉辉
Owner CHINA PETROLEUM & CHEM CORP
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