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Tertiary oil recovery oil displacement composition and preparation method thereof

A composition and oil displacement technology, which are applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor oil displacement efficiency and the like

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is the problem of poor oil displacement efficiency of the oil displacement composition in the prior art, and a new oil displacement composition for tertiary oil recovery is provided

Method used

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  • Tertiary oil recovery oil displacement composition and preparation method thereof
  • Tertiary oil recovery oil displacement composition and preparation method thereof
  • Tertiary oil recovery oil displacement composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) The amphiphilic head group anionic surfactant structural formula of preparation is as follows, wherein, m 1 +m 2 = 3, n 1 +n 2 =10, m 3 +m 4 =3.

[0081]

[0082] Add 325 grams (1 mole) of behenylamine, 2.3 grams of potassium hydroxide and 8.4 grams of anhydrous potassium carbonate in a 2L pressure reactor equipped with a stirring device, and when heated to 80-90°C, open the vacuum system, Dehydrate under vacuum for 1 hour, then replace with nitrogen for 3 to 4 times, adjust the reaction temperature of the system to 120°C and slowly introduce 134.2 grams (3.05 moles) of ethylene oxide, control the pressure ≤ 0.60MPa, wait for the reaction of ethylene oxide After the end, adjust the temperature to 130°C and slowly feed 585.8 grams (10.1 moles) of propylene oxide, control the pressure ≤ 0.60MPa, and then adjust the temperature to 140°C and slowly feed 134.2 grams ( 3.05 moles) of ethylene oxide. After the reaction was completed, the temperature was lowered t...

Embodiment 2

[0088] (1) with 【Example 1】, the difference is that behenylamine polyoxyethylene (3) polyoxypropylene (10) polyoxyethylene (3) ether and 3-chloro-2-hydroxypropanesulfonate sodium and After the sodium hydroxide reaction, there is no need to add acidification treatment, that is, heat to 85 ° C for 9 hours, change to a distillation device, distill and remove the solvent, add water and stir the residue evenly, and obtain sodium chloride, excess sodium hydroxide, and excess 3- Sodium Chloro-2-Hydroxypropanesulfonate Sodium Dihydroxypropanesulfonate Surfactant S-2.

[0089] (2) Prepare the S-2 and modified polyacrylamide (P1, copolymerized AM / AMPS molar ratio = 1 / 1, viscosity-average molecular weight 14.5 million) aqueous solution prepared in step (1) with the simulated formation water A of Zhongyuan Oilfield, and stir 4 hours, all the other are the same as [Example 1] (2), the results are shown in Table 3. The oil-water interfacial tension of different concentrations of S-2 aqueou...

Embodiment 3

[0092] (1) The amphiphilic head group anionic surfactant structural formula of preparation is as follows, wherein, m 1 +m 2 = 3, n 1 +n 2 =10, m 3 +m 4 =3.

[0093]

[0094] Obtain behenylamine polyoxyethylene (3) polyoxypropylene (10) polyoxyethylene (3) ether dihydroxypropanesulfonic acid with [Example 1] (1), the difference is to replace 90% diethanolamine 25% sodium hydroxide aqueous solution adjusts the pH=13 of the system to obtain the desired surface Active agent S-3.

[0095] (2) Prepare the aqueous solutions of S-3 and modified polyacrylamide (P1, copolymerized AM / AMPS molar ratio = 1 / 1, viscosity-average molecular weight 14.5 million) prepared in step (1) with simulated formation water A of Zhongyuan Oilfield, and stir 4 hours, all the other are the same as [Example 1] (2), and the results are shown in Table 4. The oil-water interfacial tension of different concentrations of S-3 aqueous solution is shown in Figure 1.

[0096] (3) Carry out indoor simulate...

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Abstract

The present invention relates to a tertiary oil recovery oil displacement composition and a preparation method thereof. A purpose of the present invention is to mainly solve the problem of poor oil displacement efficiency of the oil displacement composition in the prior art. The technical scheme of the present invention comprises that the tertiary oil recovery oil displacement composition comprises, by mass, 1) 1 part of a surfactant, and 2) 0-50 parts and more than 0 part of a polymer, wherein the surfactant is a double-hydrophilic head-based anionic surfactant, R1 is C8-C30 aliphatic hydrocarbonyl or aryl substituted by C4-C20 straight chain or branched chain saturated and unsaturated hydrocarbonyl, R2 and R<'>2 are respectively and independently at least one selected from C1-C5 alkylidene or hydroxy-substituted alkylidene, Y and Y<'> are independently selected from SO3M and COON, and M and N are independently selected from hydrogen, an alkali metal, and a group represented by a formula NR3(R4)(R5)(R6). With the technical scheme, the problem in the prior art is well solved. The tertiary oil recovery oil displacement composition of the present invention can be used in the oilfield oil displacement composition and the tertiary oil recovery production. The molecule general formula of the surfactant is defined in the specification.

Description

technical field [0001] The invention relates to an oil displacement composition for tertiary oil recovery and a preparation method thereof. Background technique [0002] Enhanced oil recovery technology, that is, the enhanced (EOR) and improved (IOR) oil recovery technology commonly referred to abroad, can be summarized as improving water flooding, chemical flooding, heavy oil thermal recovery, gas flooding, microbial oil recovery and physical oil recovery, etc. Six aspects. At present, the enhanced oil recovery technologies that have entered the large-scale application in mine fields are concentrated in three categories: thermal recovery, gas flooding and chemical flooding, of which the production of chemical flooding is 5.18×10 4 m 3 / d or more, accounting for about 14.7% of the world's total EOR production. Chemical flooding is an enhanced measure to enhance oil recovery by adding chemical agents to the aqueous solution to change the physical and chemical properties an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 沈之芹王辉辉吴国英李斌
Owner CHINA PETROLEUM & CHEM CORP
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