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Enhanced oil extraction method with improved recovery efficiency

A technology for enhanced oil recovery and displacement, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc., and can solve problems such as poor displacement efficiency

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] The technical problem 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 method for enhanced oil recovery is provided

Method used

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  • Enhanced oil extraction method with improved recovery efficiency
  • Enhanced oil extraction method with improved recovery efficiency
  • Enhanced oil extraction method with improved recovery efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (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.

[0086]

[0087] 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 to...

Embodiment 2

[0093] (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.

[0094] (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

[0097] (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.

[0098]

[0099] 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.

[0100] (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.

[0101] (3) Carry out indoor simulate...

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Abstract

The invention relates to an enhanced oil extraction method, and mainly solves the problem that in the prior art, the oil displacement compositions have bad oil displacement efficiency. The method comprises the following steps: (1) mixing an oil displacement composition with an oil displacement water to obtain an oil displacement system; and (2) contacting the oil displacement system with an oil containing stratum so as to displace the crude oil in the oil containing stratum under simulated oil filed stratum water conditions: oil displacement temperature 20-120 DEG C and total mineralization >5000 mg / L; wherein the oil displacement composition comprises the following components in parts by weight: (1) 1 part of surfactant and (2) 0 (not included) to 50 parts of polymer; the concentration of surfactant in the oil displacement system is 0.001 to 2.0 wt%, and the polymer concentration is 0 to 1.8 wt%. The method well solves the abovementioned problem and can be applied to oil displacement composition production and tertiary oil recovery.

Description

technical field [0001] The invention relates to a method for enhancing oil recovery. 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 and rheological properties of the injected fluid and the ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588E21B43/22
CPCC09K8/584C09K8/588C09K8/885C09K8/905E21B43/16
Inventor 沈之芹李应成吴春芳翟晓东
Owner CHINA PETROLEUM & CHEM CORP
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