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Study of novel dimeric surfactant/polymer binary compound oil-displacing agent

A Gemini surface and active agent technology, which is applied in the field of binary compound oil displacement, can solve the problems of low oil recovery rate and unrecovered crude oil, and achieve enhanced oil recovery rate, high microcosmic oil displacement efficiency, and expanded spread volume effect

Inactive Publication Date: 2015-06-03
QINGDAO HUICHENG PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the conventional primary and secondary oil recovery rates are not very high, the general mass fraction can only reach 20% to 40%, so a large amount of crude oil has not been recovered

Method used

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  • Study of novel dimeric surfactant/polymer binary compound oil-displacing agent
  • Study of novel dimeric surfactant/polymer binary compound oil-displacing agent
  • Study of novel dimeric surfactant/polymer binary compound oil-displacing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Composition of binary compound oil displacement agent: A, sulfonate ester salt type gemini surfactant B, hydrophobically modified polyacrylamide

[0020] Using the Shengtuo sewage from Shengli Oilfield as the base fluid, the surfactant and polymer mother liquors with a mass fraction of 10% were prepared respectively, and stirred for later use.

[0021] After diluting the above mother liquor with Shengtuo sewage by a certain number of times, mix the two according to a certain ratio. The polymer concentration in the mixed system is 1300mg / L, and the surfactant concentration is 0.1%, 0.3%, 0.5%, 0.7%, 0.9%. , 1.2%. Adjust the TEXAS-500 spinning drop interfacial tensiometer to 40°C, put the sample tube filled with the above solution into it, and after it stabilizes for half an hour, add about 1 microliter of crude oil from Shengli Oilfield with a micro-syringe, at a speed of 6000

[0022] At revolutions per minute, the lowest interfacial tension value that the measurement ...

Embodiment 2

[0025] Composition of binary compound oil displacement agent: A, carboxylate type gemini surfactant, B, hydrophobically modified polyacrylamide

[0026] Using the sewage from the Shengtuo area of ​​Shengli Oilfield as the base fluid, the surfactant and polymer mother liquors with a mass fraction of 10% were prepared respectively, and stirred for later use.

[0027] After diluting the above mother liquor with sewage from the isolated island area to a certain number of times, mix the two according to a certain ratio. The polymer concentration in the mixed system is 1300mg / L, and the surfactant concentration is 0.1%, 0.5%, 0.7%, 0.9%. Adjust the TEXAS-500 spinning drop interfacial tensiometer to 60°C, put the sample tube filled with the above solution into it, and after it has stabilized for half an hour, add about 1 microliter of crude oil from Shengli Oilfield with a micro-syringe, at a speed of 6000 rpm , the lowest interfacial tension value achievable by the measurement syste...

Embodiment 3

[0030] The binary compound system with specific concentration of polymer and surfactant solution concentration of 0.3% in Example 1 was placed in a thermostat at 60°C for 90 days, and the viscosity and minimum interfacial tension of the binary system were measured during this process value changes.

[0031] Depend on image 3 From the data, it can be seen that the interfacial tension and viscosity of the system will not change much during storage at a constant temperature of 90°C, indicating that the system has good stability under this compounding condition and is suitable for oilfield enhanced oil recovery.

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Abstract

The invention relates to a dimeric surfactant / polymer binary compound system suitable for enhancing the oil recovery in the Shengtuo area of Shengli Oil Field. The dimeric surfactant / polymer binary compound system is compounded from a polymer and a dimeric surfactant in a specific ratio; the system is capable of reducing the interfacial tension of the crude oil in the Shengtuo area of Shengli Oil Field to be ultralow; in long-term placement process, the viscosity and the interfacial activity of the system do not change much, and therefore, the binary system in the specific ratio has stable viscosity and is capable of thoroughly developing the effects of the enlarged wave and the volume, and also has stable interfacial tension and is capable of guaranteeing relatively high microcosmic oil displacement efficiency; and as a result, the purpose of enhancing the oil recovery is achieved.

Description

technical field [0001] The invention relates to a binary composite oil flooding technology which effectively utilizes the activity of a new type of gemini surfactant and the viscosity of a polymer, and belongs to the field of oil field chemistry. Background of the invention [0002] As an extremely important energy and chemical raw material, petroleum is in increasing demand worldwide. With the reduction of petroleum energy, the full recovery and rational utilization of petroleum has become a very important issue in the field of oilfield chemistry. Since the recovery rate of conventional primary and secondary oil recovery is not very high, the general mass fraction can only reach 20% to 40%, so a large amount of crude oil has not been recovered. Therefore, in the situation of increasingly tense energy sources, enhanced oil recovery has become an important topic in petroleum development research, and tertiary oil recovery is a very effective method for enhanced oil recovery....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584
Inventor 洪龙峰兰卫国
Owner QINGDAO HUICHENG PETROCHEM TECH
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