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Oil-water ultralow-interface-tension alkaline-free oil-displacing agent, alkaline-free chemical composite oil-displacing agent and application thereof in tertiary oil recovery

A technology of interfacial tension and alkali flooding, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unsatisfactory ultra-low interfacial tension, low active agent sweep coefficient, poor oil displacement efficiency, etc., and achieve good flooding Oil effect, good resistance to hard water and salt, strong lipophilic effect

Inactive Publication Date: 2015-10-14
涟水新源生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for oil reservoirs with high temperature and high salinity, there are disadvantages such as low active agent sweep coefficient, poor oil displacement efficiency, serious adsorption loss, and high cost when using surfactant alone for flooding.
Therefore, in actual oil recovery, people use different types of surfactants and additives or different types of surfactants for reasonable compounding. However, in the prior art, there is a problem that the formation of ultra-low interfacial tension is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare oil-water ultra-low interfacial tension alkali-free oil displacement agent, by mass percentage:

[0032] Betaine amide carboxybetaine 20%, sodium behenyl polyoxyethylene ether propionate 5%, and water as the balance, stirred and mixed evenly. Put 5% sodium behenyl alcohol polyoxyethylene ether propionate into water and stir evenly, then add behenylamide carboxybetaine 20% and stir evenly. Generally, mixing can be carried out at 20-40°C.

[0033] Preparation of chemical compound non-alkali oil displacement agent,

[0034] Add water to the oil-water ultra-low interfacial tension non-alkali oil-displacement agent prepared above, and prepare four kinds of chemical composite non-alkali oil-displacement agents with the produced water (formation water) of the oil reservoir, the mass percentage concentration (behen Alkylamide carboxybetaine and sodium behenyl polyoxyethylene ether propionate) were 0.05%, 0.10%, 0.20%, and 0.30%, respectively, using the SVT20N spinn...

Embodiment 2

[0040] Prepare oil-water ultra-low interfacial tension alkali-free oil displacement agent, by mass percentage:

[0041] Cetylamide carboxybetaine 15%, cetylamide hydroxysultaine 5%, sodium stearyl polyoxyethylene ether propionate 10%, the balance is water, stir and mix evenly to obtain.

[0042] Preparation of chemical composite non-alkali oil displacement agent:

[0043] Add water to the oil-water ultra-low interfacial tension alkali-free oil-displacement agent prepared above, and prepare four kinds of chemical composite alkali-free oil-displacement agents with oil reservoir produced water (i.e. formation water), mass percentage concentration (16 Alkylamide carboxybetaine, hexadecylamide hydroxysultaine, and sodium stearyl polyoxyethylene ether propionate) were 0.05%, 0.1%, 0.2%, and 0.3%, respectively. The test results are shown in Table 3 and Table 4 shows.

[0044] Table 3 shows the dynamic interfacial tension of the composite non-alkali oil displacement agent at 45°C a...

Embodiment 3

[0049] Prepare oil-water ultra-low interfacial tension alkali-free oil displacement agent, by mass percentage:

[0050] Cetylamide carboxy betaine 15%, cetylamide hydroxysultaine 5%, sodium stearyl polyoxyethylene ether sulfonate 10%, sodium stearyl polyoxyethylene ether propionate 10%, The balance is water, which is obtained by stirring and mixing evenly.

[0051] Preparation of chemical composite non-alkali oil displacement agent:

[0052] Add water to the oil-water ultra-low interfacial tension alkali-free oil-displacement agent prepared above, and prepare four kinds of chemical composite alkali-free oil-displacement agents with oil reservoir produced water (i.e. formation water), mass percentage concentration (16 Alkylamide carboxybetaine, hexadecylamide hydroxysultaine, sodium stearyl polyoxyethylene ether sulfonate, sodium stearyl polyoxyethylene ether propionate) are 0.05%, 0.1%, 0.2% respectively %, 0.3%, the test results are shown in Table 5 and Table 6.

[0053]...

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Abstract

The invention discloses an oil-water ultralow-interface-tension alkaline-free oil-displacing agent and an alkaline-free chemical composite oil-displacing agent prepared therewith and used in tertiary oil recovery. The oil-water ultralow-interface-tension alkaline-free oil-displacing agent is prepared by mixing the following components, by mass, 15-30% of a glycine betaine-type ampholytic surfactant, 5-20% of a fatty alcohol ether derivative-type anionic surfactant and the balanced being deionized water. The glycine betaine-type ampholytic surfactant includes one or two from a long-chain alkyl amide carboxyl glycine betaine RCONH(CH2)3N<+>(CH3)2CH2COONa and a long-chain alkyl amide hydroxysulfobetaine RCONH(CH2)3N<+>(CH3)2CH2CH(OH)CH2SO3Na, wherein R is an alkyl group being 15-22 in carbon number and preferably is an alkyl group being 20-22 in carbon number.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, in particular to an alkali-free chemical composite oil displacement agent used in tertiary oil recovery. Background technique [0002] The energy problem has become a serious problem facing my country's economic development. With the continuous increase of international oil price and the increase of the cost of exploring new oil fields, people put forward higher requirements for improving the recovery rate of existing oil fields. [0003] With the development of tertiary oil recovery technology in the 1970s, only chemical flooding developed three technologies: surfactant flooding, polymer flooding and alkaline water flooding. The mechanism of surfactant and alkaline water flooding is based on the formation of ultra-low interfacial tension, while single injection of polymer or injection of surfactant followed by injection of polymer is to control fluidity, thereby improving oil recovery. yie...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 曹琴许虎君尹劲松张雷刘学东
Owner 涟水新源生物科技有限公司
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