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Composite oil displacement agent containing polymer and cationic/anionic surfactant, and oil displacement method

A surfactant, compound oil displacement technology, applied in chemical instruments and methods, drilling compositions, production fluids, etc., can solve problems such as poor oil displacement efficiency, and achieve improved oil displacement efficiency, excellent temperature resistance, The effect of excellent interfacial activity

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the problem that the composite oil displacement agent used in the prior art has poor oil displacement efficiency in the enhanced oil displacement process. A new composite flooding agent containing polymer and anion-cation system surfactant is provided oil agent

Method used

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  • Composite oil displacement agent containing polymer and cationic/anionic surfactant, and oil displacement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Sodium octadecylbenzenesulfonate and tetradecyltrimethylammonium chloride are added to the reaction flask in a molar ratio of 5:1, and 40wt% ethanol aqueous solution is used as a solvent, and the temperature is raised to 70° C. and stirred for 2.5 hours to Dissolve completely, and distill under reduced pressure to remove ethanol to obtain the desired anion-cation system surfactant, wherein the total surfactant content is 45.1% by mass percentage.

[0035] (2) The anion-cation system surfactant and modified polyacrylamide (M=6 million) aqueous solution prepared in step (1) were prepared separately with Sha 7 formation water (TDS 15000mg / L) in Jiangsu Oilfield, stirred for 3 hours, and then the two These were mixed to obtain a homogeneous poly-surface composite oil displacement agent. The viscosity of the system and the oil-water interfacial tension with the Sha 7 dehydrated crude oil in Jiangsu Oilfield were measured at a test temperature of 83°C, as shown in Table 1....

Embodiment 2

[0041] (1) Add sodium petroleum sulfonate and tetradecyltrimethylammonium bromide into the reaction flask in a molar ratio of 8:1, use 20wt% methanol aqueous solution as the solvent, heat up to 50°C and stir for 3 hours until completely dissolved, reduce Pressure distillation removes methanol, obtains required anion-cation system surfactant, and wherein the total surfactant content is 45.3% by mass percentage.

[0042] (2) Prepare the anion-cation system surfactant and modified polyacrylamide (M=9 million) aqueous solution prepared in step (1) respectively with Sha 7 formation water (TDS 20000mg / L) in Jiangsu Oilfield, stir for 4 hours, and the rest are the same as [ Embodiment 1] (2), the results are shown in Table 2.

[0043] (3) 75°C was used as the oil displacement temperature, and the rest were the same as [Example 1] (3). The results are shown in Table 2.

[0044] Table 2

[0045] Oil displacement system 0.3wt%S2 0.07wt%P2 0.3%wtS1+0.07wt%P1 Oil-wat...

Embodiment 3

[0048] (1) Sodium α-olefin sulfonate (commercially available C 16 ~C 18 Add α-olefin sulfonate sodium mixture) and dodecyltrimethylammonium chloride into the reaction flask at a molar ratio of 10:1, use 30wt% isopropanol aqueous solution as the solvent, heat up to 60°C and stir for 3 hours until completely dissolved , Isopropanol was distilled off under reduced pressure to obtain the desired anion-cation system surfactant, wherein the total surfactant content was 50.9% by mass percent.

[0049] (2) Prepare the anion-cation system surfactant and modified polyacrylamide (M=6 million) aqueous solution prepared in step (1) respectively with Sha 7 formation water (TDS 10000mg / L) in Jiangsu Oilfield, stir for 2 hours, and the rest are the same as [ Embodiment 1] (2), the results are shown in Table 3.

[0050] (3) Use 90°C as the oil displacement temperature, inject 0.2PV, and the rest are the same as [Example 1] (3). The results are shown in Table 3.

[0051] table 3

[0052] ...

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Abstract

The invention relates to a composite oil displacement agent containing a polymer and a cationic / anionic surfactant, and an oil displacement method, and mainly solves a problem of bad oil displacement efficiency of composite oil displacement agents used in the prior art. The composite oil displacement agent containing a polymer and a cationic / anionic surfactant includes the cationic / anionic surfactant, the polymer and water; the cationic / anionic surfactant comprises an anionic surfactant and a cationic surfactant according to a molar ratio of (1-100):1; the anionic surfactant is anyone of sulfonate, carboxylate and phosphate; the cationic surfactant is a quaternary ammonium salt or quaternary ammonium alkali; the polymer is modified polyacrylamide obtained by copolymerizing two monomers of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, and a molar ratio of the two monomers in the modified polyacrylamide is (1-4):1. The composite oil displacement agent solves the problem and can be used for enhanced oil displacement production of high temperature and low salinity oil reservoirs.

Description

technical field [0001] The invention relates to a composite oil-displacement agent containing a polymer and an anion-cation system surfactant and an oil-displacement method. Background technique [0002] Chemical flooding is the main method of enhanced oil displacement. As an important technology in chemical flooding, the ASP flooding technology formed by polymer, surfactant and alkali has been tested in some mines at home and abroad, and good oil displacement effects have been achieved. However, the addition of alkali will easily lead to clogging of oil layers and decrease of permeability in field tests, and the emulsification of crude oil is serious, so it is difficult to separate the oil and water of the produced fluid. The binary compound flooding formula formed by polymer and surfactant has attracted attention because no alkali is used, which effectively avoids the above problems. However, because no alkali is used, the interfacial tension between crude oil and water o...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584C09K8/588
Inventor 沈之芹李应成张卫东王辉辉
Owner CHINA PETROLEUM & CHEM CORP
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