Clay anti-swelling stabilizer as well as preparation method and application thereof

A stabilizer and anti-swelling technology, applied in the field of clay anti-swelling stabilizer for oilfield and its preparation, can solve the problem of unsatisfactory application effect in cold region and low temperature zone, poor anti-swelling ability of anti-swelling agent, serious casing damage and layered water injection and other problems, to achieve the effect of improving oil recovery, ensuring normal and stable production, and high anti-swelling efficiency

Inactive Publication Date: 2014-05-07
大庆浩拓化工有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Existing anti-clay swelling or clay stabilizers are mainly small molecule quaternary ammonium salts or polyquaternium cationic surfactants or they are combined with KCl, CaCl 2 or NH 4 Cl, etc. are compounded, although they play a certain anti-swelling and stabilizing effect, these anti-swelling agents have poor anti-scourability, great damage to the formation, and are likely to cause deformation due to water well casings.
Severe casing damage prevents the implementation of effective layered water injection, which eventually leads to a series of oilfield development problems such as prominent conflicts between layers
The BH-2018 surfactant invented by Daqing Haotuo Chemical Co., Ltd. has a remarkable application effect in water flooding and tertiary oil recovery in strong water-sensitive layers, but the application effect in cold and low-temperature areas is not very satisfactory

Method used

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  • Clay anti-swelling stabilizer as well as preparation method and application thereof
  • Clay anti-swelling stabilizer as well as preparation method and application thereof
  • Clay anti-swelling stabilizer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 71kg of BH-2018 surfactant, 7kg of sodium alginate, 2kg of ethylene glycol, 7kg of KCl and 13kg of glycerol, add BH-2018 surfactant, sodium alginate and ethylene glycol at room temperature and pressure In a sealed pressure reactor, start stirring, gradually raise the temperature to 60° C., and react for 2 hours. The mixture obtained by the reaction was cooled to 20° C., KCl and glycerol were added, and the stirring reaction was continued for 0.5 hours to obtain 100 kg of the clay anti-swelling stabilizer of the present invention. Store the packaging.

Embodiment 2

[0032] Weigh 75kg of BH-2018 surfactant, 3kg of sodium alginate, 2kg of ethylene glycol, 7kg of KCl, and 13kg of glycerol, and add BH-2018 surfactant, sodium alginate, and ethylene glycol into the airtight container at room temperature and pressure. In the pressure reactor, start stirring, gradually raise the temperature to 100°C, and react for 0.5 hours. The temperature of the reaction mixture was lowered to 15° C., KCl and glycerol were added, and the stirring reaction was continued for 1 hour to obtain 100 kg of the clay anti-swelling stabilizer of the present invention. Store the packaging.

Embodiment 3

[0034] Weigh 75kg of BH-2018 surfactant, 6kg of sodium alginate, 1.5kg of ethylene glycol, 6.5kg of KCl and 11kg of glycerol, and place BH-2018 surfactant, sodium alginate, and ethylene glycol at room temperature and pressure Add it into the airtight pressure reactor, start stirring, gradually raise the temperature to 80°C, and react for 10 hours. The temperature of the reaction mixture was lowered to 30° C., KCl and glycerol were added, and the stirring reaction was continued for 0.5 hours to obtain 100 kg of the clay anti-swelling stabilizer of the present invention. Store the packaging.

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Abstract

The invention provides a clay anti-swelling stabilizer which is prepared from the following raw materials by weight percent: 65-80% of BH-2018 surfactant, 1-15% of sodium alginate, 1-10% of glycol, 5-15% of KCl and 10-28% of glycerol. The clay anti-swelling stabilizer is wide in raw material source, less in production consumed energy, low in cost, high in anti-swelling efficiency and comprehensive in mechanism, and has the effect of improving recovery efficiency. When 1% clay anti-swelling stabilizer is used for injection, the anti-swelling property can achieve more than 85%. The invention also provides a preparation method of the novel clay anti-swelling stabilizer.

Description

technical field [0001] The invention relates to a clay anti-swelling stabilizer for oil fields and a preparation method thereof. Background technique [0002] With the rapid development of the economy, China's demand for crude oil is increasing. Net imports account for about 30% of the total consumption. Crude oil has become an important factor restricting China's economic development. In order to reduce the impact of international crude oil prices on China's economic development and maintain sustained economic growth, it has become China's top priority to adopt new technologies, improve the recovery rate of crude oil in existing oil fields, and increase crude oil production. [0003] In the process of oil exploitation, among many factors that damage the reservoir, clay minerals are one of the main factors. There are many clay minerals in the oil reservoirs, according to the data, 97% of the oil reservoirs in the world contain clay minerals to varying degrees. Almost all s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/575C09K8/588C09K8/584
CPCC09K8/03C09K8/607C09K2208/12
Inventor 韩力挥朱大雷韩卫忠王犇
Owner 大庆浩拓化工有限公司
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