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A kind of improved betaine surfactant system with block copolymer and use thereof

A technology of surfactants and block copolymers, which is applied in the field of chemical flooding systems (ie, chemical flooding systems, chemical flooding additives), can solve the problems of negative impacts on oil production and the environment, formation damage, and limited improvement in oil production capacity. Achieve the significance of protecting natural resources, strong anti-salinity ability, and improve oil displacement efficiency

Active Publication Date: 2016-05-25
SHANGHAI HAIGUI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reason for the decline in secondary oil recovery efficiency is that due to capillary force, the remaining crude oil is intermittently bound in the pores of the rock sand in the reservoir layer, which prevents the crude oil from flowing freely with the injection water system
The traditional three-component compounding technology is used for tertiary oil recovery in oilfield development. The main problems are: 1) The use of alkali for a long time will cause formation damage, which will have a negative impact on oil recovery and the environment; 2) The use of alkali will cause some surfactants and polymer instability and decomposition, limiting the choice of surfactants and polymers
However, this method only depends on the dissolution of micelles, and the improvement of oil production capacity is limited.
And because of the cost of surfactants, the application of this high concentration is very limited
[0011] However, the formulation of low-concentration systems, especially under the condition of no alkali, lacks corresponding laboratory research and theoretical guidance, and lacks experience in practical application, resulting in weak ability to systematically formulate and optimize formulas, and blindness when looking for formulas Big
Currently, there are no relevant reports

Method used

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  • A kind of improved betaine surfactant system with block copolymer and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 50% betaine surfactant single agent solution: take oleyl dimethyl betaine (from Western Surfactants Research and Development Center, USA, with 30% activity (i.e. effective concentration), pH6.0-7.0) 50 grams of deionized water, 50 grams of deionized water; add to a beaker respectively, and then stir evenly at room temperature with a magnetic stirrer. Adjust the pH to 7-8 with sodium hydroxide and acetic acid. The formed surfactant system is a homogeneous transparent liquid.

[0036] Crude oil: from oil fields in Northeast China, the crude oil presents high acidity and high aromatic components.

[0037] Test instrument: TX-500C interfacial tension.

[0038] Test conditions: (1) temperature 55 degrees Celsius; (2) reinjection water containing salinity of 4000mg / L; (3) polymer: 1000ppm polyacrylamide (from Liaoning Panjin Heilan Chemical Co., Ltd. with a molecular weight of 25 million); (4) surface activity Agent concentration: 0.05% and 0.10%. This surfactant concentr...

Embodiment 2

[0042] In the surfactant of Example 1 above, a polyoxyethylene polypropylene oxide block copolymer, represented by T1, was added. The general structural formula of T1 is as follows (A or B):

[0043] A.: (EO) n –(PO) m – (EO) p ;or

[0044] B.: (PO) n – (EO) m –(PO) p

[0045] Among them, EO stands for ethylene oxide, PO stands for propylene oxide; m, n, p are the repetition times of the monomer, and the value range of m, n, p is 0-400.

[0046] T1 is formed by staged polymerization. First, the monomer reacts to produce the middle part (for example, first propylene oxide is polymerized; then another monomer (such as ethylene oxide) is used to continue the polymerization reaction to complete the parts at both ends.

[0047] The specific configuration is as follows: take 50 grams of oleyl dimethyl betaine (same as Example 1), T1 (polyethylene oxide polypropylene oxide block copolymer, from Panjin Hailan Chemical Industry, Liaoning, with a molecular weight of 2000 -2500D...

Embodiment 3

[0054] Surfactant preparation: get oleylamide dimethyl propyl betaine (from U.S. Western Surfactants Research and Development Center (WesternSurfactantsResearchandDevelopmentCenter, USA, have 35% activity, pH6.0-7.0) 50 grams, deionized water 50 grams Add the above to a beaker respectively, and then stir evenly at room temperature with an electromagnetic stirrer. Regulate the pH to 7-8 with sodium hydroxide and acetic acid. The formed surfactant system is a uniform transparent liquid.

[0055] Crude oil: with embodiment 1.

[0056] Test instrument: TX-500C interfacial tension.

[0057] Test conditions: (1) temperature 55 degrees Celsius; (2) reinjection water containing salinity 4000mg / L;

[0058] (3) Polymer: 1000ppm polyacrylamide (from Liaoning Panjin Heilan Chemical Co., Ltd. with a molecular weight of 25 million); (4) Surfactant concentration: 0.2%.

[0059] Test results: When the surfactant concentration is 0.2%, the oil-water interfacial tension is 0.11dyn / cm.

[006...

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Abstract

The invention discloses a betaine surfactant system improved by a segmented copolymer and an application of the betaine surfactant system. The system comprises a betaine surfactant, a poly oxirane-poly epoxypropane segmented copolymer and oil well injecting water, wherein the betaine surfactant is formed by selecting any more than one betaine from alkyl dimethyl betaine, alkyl amide propyl dimethyl betaine, alkyl sulfo betaine and alkyl hydroxyl sulfo betaine; the mass ratio of the betaine surfactant and the poly oxirane-poly epoxypropane segmented copolymer is 1:(0.03-1) under the condition that the pure activity of the betaine surfactant is 100%. The system is strong in mineralization-resisting capacity, has the good compatibility with polymers, especially PAM (polyacrylamide) polymers and is high in temperature stabilization, so that the exploitation of reservoir oil can be improved by 10% to 15% as the system is used for the three-time chemical displacement of the reservoir oil. In addition, the system is low in concentration, so that the cost is greatly lowered; alkali is not contained in the system, so that the selection range of the polymer is enlarged while an important significance for the protection of natural resources is obtained.

Description

technical field [0001] The invention belongs to the field of oil field development, and relates to a chemical flooding additive for oil field development, in particular to a block copolymer improved betaine surfactant system and its application, suitable for low surfactant concentration, alkali-free Added chemical flooding system (ie chemical flooding system). Background technique [0002] In the usual oil field development, the first extraction method is to exploit the energy of the oil layer itself, that is, primary oil recovery. At this stage, the crude oil is erupted out with the well pipe by its own energy. Usually about 15-20% of the oil reservoirs are developed in this way (i.e. primary oil recovery). With the deepening of extraction, when the natural energy cannot meet the needs due to attenuation, water or gas needs to be injected into the oil layer to maintain the production or recovery rate of the oil well, which is the secondary oil recovery stage. Another 15-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/584E21B43/22
Inventor 吴斌林增琪林晨吴安然
Owner SHANGHAI HAIGUI CHEM TECH CO LTD
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