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Polymer and surfactant binary system for oil displacement, and oil displacement method

A technology of binary system and oil displacement method, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems such as poor oil displacement efficiency, increase hydrophilicity, high surface activity, and solve interfacial tension rising effect

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

[0004] One of the technical problems to be solved by the present invention is the poor oil displacement efficiency of the poly-surface binary system used in the prior art in the process of enhanced oil recovery. A new poly-surface binary system is provided

Method used

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  • Polymer and surfactant binary system for oil displacement, and oil displacement method
  • Polymer and surfactant binary system for oil displacement, and oil displacement method
  • Polymer and surfactant binary system for oil displacement, and oil displacement method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Octadecyl polyoxypropylene (m=3) polyoxyethylene (n=10) 45 parts of sodium ether hydroxypropanesulfonate, 10 parts of cetyl betaine, 50 parts of ethanol and 47 parts of tap water were added in sequence In a mixing container, raise the temperature to 80°C and stir for 3 hours, then distill off ethanol under reduced pressure to obtain the required composite surfactant, in which octadecyl polyoxypropylene (m=3) polyoxyethylene (n=10) ether hydroxyl The total content of sodium propanesulfonate and cetyl betaine accounts for 55.1% of the composite surfactant in terms of mass percentage.

[0044] (2) Prepare the aqueous solution of composite surfactant and low molecular weight modified polyacrylamide (M=7 million) prepared in step (1) with Sha 7 formation water (TDS 15000mg / L) in Jiangsu Oilfield, stir for 3 hours, and then The two were mixed to obtain a homogeneous poly-surface binary system oil displacement agent. The viscosity of the system and the oil-water interfacia...

Embodiment 2

[0050] (1) 30 parts of nonylphenol polyoxypropylene (m=8) polyoxyethylene (n=6) potassium ether ethanesulfonate, 15 parts of cocamidopropyl betaine, 50 parts of methanol and 57 parts of deionized water Add to the mixing container in turn, raise the temperature to 50°C and stir for 3 hours, distill the methanol under reduced pressure to obtain the required composite surfactant, in which nonylphenol polyoxypropylene (m=8) polyoxyethylene (n=6) ether The total content of potassium ethanesulfonate and cocamidopropyl betaine accounted for 45.3% of the composite surfactant in terms of mass percentage.

[0051] (2) Prepare the aqueous solution of composite surfactant and low molecular weight modified polyacrylamide (M=9 million) prepared in step (1) with Sha 7 formation water (TDS 20000mg / L) in Jiangsu Oilfield, stir for 4 hours, and the rest are the same as [Example 1] (2), the results are shown in Table 2.

[0052] (3) Use 55°C as the oil displacement temperature, and the rest are...

Embodiment 3

[0057] (1) Behenyl polyoxypropylene (m=4) polyoxyethylene (n=2) 25 parts of sodium ether ethanesulfonate, 5 parts of cetyl betaine, 50 parts of isopropanol and 75 parts of tap water in order Add it into a mixing container, raise the temperature to 90°C and stir for 2 hours, distill off isopropanol under reduced pressure to obtain the required composite surfactant, in which behenyl polyoxypropylene (m=4) polyoxyethylene (n= 2) The total content of sodium ether ethanesulfonate and cetyl betaine accounted for 29.8% of the composite surfactant in terms of mass percentage.

[0058] (2) Prepare the aqueous solution of composite surfactant and low molecular weight modified polyacrylamide (M=5 million) prepared in step (1) with Sha 7 formation water (TDS 10000mg / L) in Jiangsu Oilfield, stir for 2 hours, and the rest are the same as [Example 1] (2), the results are shown in Table 3.

[0059] (3) Use 90°C as the oil displacement temperature, inject 0.2PV, and the rest are the same as [...

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Abstract

The invention relates to a polymer and surfactant binary system for oil displacement, and an oil displacement method, and mainly solves a problem of bad oil displacement efficiency in the enhanced oil recovery process of composite oil displacement agents used in the prior art. The polymer and surfactant binary system for oil displacement comprises, by weight, 1 part of an anionic-nonionic surfactant, 0.05-50 parts of a zwitterionic surfactant and 0.5-50 parts of a low molecular weight polymer. The polymer and surfactant binary system for oil displacement can well solve the problem, and can be used in the enhanced oil recovery production of oilfields.

Description

technical field [0001] The invention relates to a poly-surface binary system for oil displacement and an oil displacement method. Background technique [0002] In recent years, domestic and foreign studies on the feasibility of improving oil recovery through chemical flooding in low-permeability reservoirs have shown that chemical flooding can also be used in low-permeability reservoirs to enhance oil recovery, among which polymer flooding is the most studied. Due to the characteristics of low porosity and low permeability, there is a start-up pressure gradient in low-permeability reservoirs. Therefore, the adaptability of polymer flooding to low-permeability reservoirs is mainly related to the viscosity and injection pressure of the polymer, and the viscosity of the polymer is mainly determined by the polymer The relative molecular mass of the substance and the injection concentration are determined. In 1984, Ball and Pitt first determined the conditions for the polymer to...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/584E21B43/22
CPCC09K8/584C09K8/588
Inventor 沈之芹李应成马夏坪李斌
Owner CHINA PETROLEUM & CHEM CORP
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