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Microemulsion system and preparation method

A technology of microemulsion and reverse microemulsion, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of slowness, low plugging strength, and large dosage

Active Publication Date: 2018-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the amount of conventional emulsifier used for inverse microemulsion polymerization in the prior art is large, the stability of the inverse microemulsion is poor, and the early expansion of polymer microspheres in the prior art is relatively rapid, and the expansion in the later stage is relatively rapid. slow and low plugging strength in large pores, a microemulsion system using a sulfonate composite emulsifier is provided. This microemulsion system has good water plugging and profile control effects, and also has the effect of oil washing and oil displacement It can meet the field operation requirements of enhanced oil recovery such as water plugging, deep profile control and displacement in the tertiary oil recovery of the oil field, and has good economical efficiency

Method used

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  • Microemulsion system and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Synthesis of sulfonate surfactants:

[0051] (1) Synthesis of chlorinated isomeric tetradecyl alcohol polyoxypropylene (10) polyoxyethylene (2) ether:

[0052] In a glass reactor equipped with a reflux condensing device, a thermometer, an agitator and a gas absorption device, add 92g of isomeric tetradecyl alcohol polyoxypropylene (10) polyoxyethylene (2) ether, 13g of pyridine, At a temperature of 68°C, slowly add 26.5g of thionyl chloride dropwise with a dropping funnel, stir while adding to make it evenly mixed, continue to react for 5.5 hours after the dropwise addition, end the reaction, let stand, cool and separate, use 30% sodium hydroxide solution to adjust the pH value of the upper layer to 7.4, then wash the upper layer three times with hot saturated brine, and dry to obtain chloroisomeric tetradecyl alcohol polyoxypropylene (10) polyoxyethylene (2) Ether, the yield is 87.9%.

[0053] (2) Synthesis of isomeric tetradecyl alcohol polyoxypropylene (10) poly...

Embodiment 2

[0059] The synthesis of the sulfonate surfactant and the preparation process of the microemulsion system are the same as in [Example 1], except that sodium acrylate is replaced by 2-acrylamido-2-methylpropanesulfonic acid. The initial particle size and distribution of the microspheres in the microemulsion system were tested using a Zetasizer Nano2000 particle size analyzer produced by Malvern Instruments in the United Kingdom; they were placed in brine with a total salinity of 160,000 mg / L at 92°C and anaerobic conditions for 7 days, 15 days, After 30 days and 45 days, the particle size of the microspheres was calculated, and the expansion factor of the microspheres was calculated; the TX-500 spinning drop interfacial tensiometer produced by the University of Texas was used to measure the relationship between the microemulsion system and the Pu 2-529 output oil. interfacial tension. The results are shown in Table 1.

Embodiment 3

[0061] The synthesis of sulfonate surfactant and the preparation process of microemulsion system are all the same as [Example 1], except that the emulsifying agent isomerized myristyl alcohol polyoxypropylene (10) polyoxyethylene (2) ether The dosages of potassium sulfonate and Tween 65 were changed to 3.6g and 13.9g, respectively. Use the Zetasizer Nano 2000 particle size analyzer produced by Malvern Instruments in the United Kingdom to test the initial particle size and distribution of microspheres in the microemulsion system; place it in brine with a total salinity of 160,000 mg / L at 92°C and anaerobic conditions for 7 days and 15 days , 30 days, and 45 days later, the particle diameter of the microspheres was calculated, and the expansion factor of the microspheres was calculated; the TX-500 spinning drop interfacial tensiometer produced by the University of Texas was used to measure the relationship between the microemulsion system and the Pu 2-529 output oil. interfacial...

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Abstract

The invention relates to a microemulsion system and a preparation method which mainly solve the existing problem in the current techniques that inverse microemulsion polymerization uses lots of conventional emulgator and is of bad stability. Polymeric microspheres swell relatively quickly in the early period and swell slowly in the late period in the current techniques. The plugging intensity is low in a large hole path. By adding sulfonate surface activator that formula I shows and using the inverse microemulsion polymerization method, the microemulsion system and the preparation method prepare the microemulsion system. A technique system which comprises, by mass, the following components, 20 to 80 parts of base oil, 10 to 70 parts of water, 10 to 50 parts of polymer microspheres of heat resistance and salt tolerance, 0.5 to 18 parts of sulfonate compound emulsifier and 0.01 to 10 parts of auxiliary emulsifier well solves the problem that the inverse microemulsion polymerization uses lots of conventional emulgator and is of bad stability and polymeric microspheres swell relatively quickly in the early period and swell slowly in the late period in the current techniques and the plugging intensity is low in a large hole path. The technique scheme can be applied to oil extraction for three times in oil fields to improve recovery efficiency of crude oil as oil-displacing agent and profile control agent for deep water shutoff. (img file='DDA0000825426780000011.TIF' wi='1352' he='180' / ).

Description

technical field [0001] The invention relates to a microemulsion system and a preparation method thereof, in particular to a microemulsion system using a sulfonate composite emulsifier and a preparation method thereof. Background technique [0002] At present, most oil fields in my country have entered the tertiary oil recovery stage, and the water content of the produced fluid is as high as 98%, and many mines have lost their mining value. However, through reservoir analysis, it is found that there are still oil layers in the exploited reservoirs. This phenomenon is common in reservoirs with severe heterogeneity and high permeability. At present, water flooding and chemical flooding are still the main means to enhance oil recovery, so deep profile control technology for heterogeneous reservoirs is particularly important. [0003] However, due to fracturing in tertiary oil recovery, there are a large number of fractures and high-permeability strips in the formation. After l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/60C08F222/38C08F283/06C08F220/06C08F226/10C08F2/32C08G65/334C09K8/512C09K8/584
Inventor 于志省沈之芹
Owner CHINA PETROLEUM & CHEM CORP
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