Polymer microemulsion system for deep profile control of oil reservoir and preparation method thereof

A polymer, deep technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of reducing oil displacement effect, poor oil-water interface activity, aquatic toxicity, skin irritation, poor teratogenicity, and biodegradability. and other problems, to achieve the effect of narrow particle size distribution, enhanced interfacial activity, and improved oil recovery as required by field operations

Active Publication Date: 2017-06-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the lipophilicity of Span will make the activity of the oil-water interface worse. After the microspheres are formulated into an aqueous solution and injected

Method used

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  • Polymer microemulsion system for deep profile control of oil reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] [Example 1]

[0046] 1. Synthesis of palmitic acid diethanolamide surfactant:

[0047] (a) Synthesis of methyl palmitate

[0048] Add 100g of palmitic acid (alias: palmitic acid, hexadecanoic acid) to the three-necked flask, then add 50mL of methanol and 0.8g of sodium hydroxide, install a reflux and stirring device, control the reaction temperature at 60°C, and under full stirring The reaction was carried out for 3h. After the reaction is finished, the excess methanol is distilled off, and it is transferred into a separatory funnel. After standing, the glycerol in the lower layer is separated, and the obtained crude fatty acid methyl ester is washed several times with water to a medium size, and then washed once with a saturated aqueous NaCl solution to obtain a refined solution. Fatty acid methyl ester, the calculated yield is 93.8%.

[0049] (b) Synthesis of palmitic acid diethanolamide

[0050] 80g of methyl palmitate and 18g of diethanolamine were added to the ...

Example Embodiment

[0061] [Example 2]

[0062] The synthesis of palmitic acid diethanolamide surfactant and the preparation process of the deep regulating and flooding microemulsion system are the same as [Example 1], except that the amounts of emulsifier palmitic acid diethanolamide and Span80 are changed to 13g and 11g respectively. The polymer microemulsion system and the characterization method of the polymer microspheres therein are the same as [Example 1], and the results are shown in Table 1.

Example Embodiment

[0063] [Example 3]

[0064] The synthesis of palmitic acid diethanolamide surfactant and the preparation process of the deep regulating and flooding microemulsion system are the same as in [Example 1], except that the dosages of the emulsifiers palmitic acid diethanolamide and Span80 are changed to 6g and 18g respectively. The polymer microemulsion system and the characterization method of the polymer microspheres therein are the same as [Example 1], and the results are shown in Table 1.

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Abstract

The invention relates to a polymer microemulsion system for deep profile control of an oil reservoir and a preparation method thereof. The objective of the invention is mainly to overcome the problems that the usage amount of conventional emulsifiers in reversed-phase microemulsion polymerization in the prior art are great and final oil displacement effect is influenced. The polymer microemulsion system for deep profile control of the oil reservoir is prepared through polymerization of reversed-phase microemulsion under the action of a redox composite initiator. The reversed-phase microemulsion comprises, by weight, 50 parts of an oil-soluble solvent, 3 to 20 parts of an emulsifier, 10 to 70 parts of acrylamide monomers, 0.5 to 20 parts of heatproof salt-resistant monomers and 10 to 60 parts of water. With such a technical scheme, the above problems are overcome, and the prepared polymer microemulsion system can be directly diluted with water to obtain an aqueous solution with a desired concentration and be applied to tertiary oil recovery of an oil field.

Description

technical field [0001] The invention relates to a polymer microemulsion system for oil reservoir deep control and flooding and a preparation method thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. However, for heterogeneous formations, the displacement can only act on the high-permeability layer, not the oil-bearing low-permeability layer, which reduces the recovery rate of crude oil and increases the cost. Generally, injection well profile control and production well water plugging technology are often used for heterogeneous forma...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F222/38C08F2/32C08F4/40C09K8/588
Inventor 宋晓芳夏燕敏许汇
Owner CHINA PETROLEUM & CHEM CORP
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