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Foam compound oil displacement agent and preparation method thereof

A composite flooding and foam technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient foam stability and uneven distribution, and achieve uniform distribution, stable foam, and simplified construction process and equipment Effect

Active Publication Date: 2010-06-16
华鼎鸿基采油技术服务(北京)有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the foams in the foam composite oil displacement agents currently used in oilfields are prepared on the ground from gas and solution, or by means of bottom-hole gas agitation and added surfactants to make the bottom-hole fluid into foam, The foam generated in this way is not stable enough, and the distribution in the downhole is not uniform enough

Method used

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preparation example Construction

[0046] The preparation method of foam composite oil displacement agent of the present invention is:

[0047] a) Mix the urea, ammonium chloride and autogenous acid system in the A agent in proportion, stir evenly, pack and store;

[0048] b) Mix the nitrite, sodium diisocyanurate, surfactant and polymer in agent B in proportion, stir evenly, pack and store.

[0049] Agent A and Agent B should be stored separately, and should not be stacked on top of each other to prevent the reaction between urea and nitrite, and must be moisture-proof and waterproof to prevent the acid-producing substances in them from being hydrolyzed by water and deteriorating the oil-displacing agent. When used on site, agent A and agent B are preferably prepared according to the molar ratio of urea to nitrite of 1:2 to 1:3.

Embodiment 1

[0051] Agent A: 70% urea from Tianjin Jinhui Taiya Chemical Reagent Co., Ltd., 20% ammonium chloride from Shanghai Shenglei Chemical Co., Ltd., and 10% sodium dichloroisocyanurate from Shandong Sunshine Chemical Co., Ltd.

[0052] Agent B: 60% sodium nitrite from Shandong Luguang Chemical Factory, 10% formaldehyde from Harbin Dichron Chemical Co., Ltd., 15% heavy alkylbenzene sulfonate sodium from Tianjin Xiongguan Technology Development Co., Ltd., Shanghai Yuanliang Chemical Co., Ltd. The company's partially hydrolyzed polyacrylamide 15%.

Embodiment 2

[0054] Agent A: 65% urea from Tianjin Jinhui Taiya Chemical Reagent Co., Ltd., 15% ammonium chloride from Shanghai Shenglei Chemical Co., Ltd., and 20% acetyl chloride from Changzhou Runyuan Chemical Co., Ltd.

[0055] Agent B: 50% potassium nitrite from Nanjing Shengqinghe Chemical Co., Ltd., 15% sodium dichloroisocyanurate from Shandong Sunshine Chemical Co., Ltd., 20% sodium fatty alcohol polyoxyethylene ether sulfate from Guangzhou Shengda Chemical Co., Ltd. 15% of carboxymethyl cellulose from Huabei Petroleum Everbright Petrochemical Co., Ltd.

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Abstract

The invention provides a foam compound oil displacement agent, comprising the following components by weight percent: agent A containing 50-70% of urea, 10-30% of ammonium chloride and 8-25% of acid producing substance, agent B containing 30-60% of nitrite, 8-35% of sodium dichloroisocyanurate, 10-20% of surfactant and 10-20% of polymer. The foam compound oil displacement agent provided by the invention enters into stratum or rock shaft, gas is produced by chemical reaction under stratum condition, surfactant and polymer in oil displacement agent are coordinated, and massive foam is formed onthe stratum, the generated foam is stable and evenly distributed, the gas produced by self reaction of solution instead of external gas is utilized to form foam, thus simplifying construction processand device.

Description

technical field [0001] The invention relates to oil field tertiary oil recovery technology, in particular to a foam composite oil displacement agent. Background technique [0002] As most of my country's oilfields have entered the high water-cut development period, tertiary oil recovery technology has gradually developed. Tertiary oil recovery is compared with primary oil recovery and secondary oil recovery. In the early stage of oil exploitation, the oil recovery is only using the natural energy of the formation as primary oil recovery, and the recovery rate is only about 10%. It reaches about 25% to 40%; tertiary oil recovery is to use physical, chemical and biological means to continue to exploit the remaining underground oil. As far as my country's current situation is concerned, the use of chemical means to recover oil, that is, chemical flooding, is still the key to improving oil recovery in my country's oilfields. The main development direction of the yield rate, amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
Inventor 刘阳王江红付秀峰卢琼谭祥玲
Owner 华鼎鸿基采油技术服务(北京)有限公司
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