Microemulsion type imbibition agent, and preparation method thereof and oil displacement type fracturing fluid system

A technology of imbibition agent and microemulsion, which is applied in chemical instruments and methods, composition of drilling holes, etc., can solve problems such as poor fracturing effect and so on.

Inactive Publication Date: 2021-06-22
盘锦鸿鼎油气技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual fracturing fluid in the formation is considered to have a bad effect on the fracturing effect
Because of this, it is required to flow back the fracturing fluid as soon as possible after fracturing, so as to reduce the result of low oil well production and poor fracturing effect caused by the damage to the formation caused by the existence of fracturing fluid.

Method used

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  • Microemulsion type imbibition agent, and preparation method thereof and oil displacement type fracturing fluid system
  • Microemulsion type imbibition agent, and preparation method thereof and oil displacement type fracturing fluid system
  • Microemulsion type imbibition agent, and preparation method thereof and oil displacement type fracturing fluid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0106] In percent by weight, 45% of the fatty alcohol ether grafted comb polymer active agent obtained in Example 1, 25% of 18 alkyl hydroxypropyl ethyl sulfobetaine, 2.2% of 10 carbon perfluoroalkyl polyoxygen Mix vinyl ether with 27.8% water, react at 65° C. for 2 hours, and obtain the emulsifier used in the present invention through self-assembly reaction.

[0107] At a temperature of 60°C, add 25% of 200# solvent naphtha and 20% of the emulsifier prepared above and stir for 1 hour; then raise the temperature to 70°C, and react while adding 54% of water dropwise until the addition of water is complete. Add 1% urotropine, continue to stir and react for 1 hour, and obtain the microemulsion type osmotic agent.

[0108] The surface tension of 0.1% is 24.77mN / m, the surface tension of 0.2% is 23.42mN / m, and the surface tension of 0.3% is 22.82mN / m.

Embodiment 3

[0110] By weight percent, the fatty alcohol ether that 40% embodiment 1 obtains is grafted comb polymer active agent, and 25% main chain is 18 alkyl hydroxypropyl ethyl sulfobetaine, 3% 10 carbon perfluoroalkane Mix base polyoxyethylene ether with 32% water and react at 65°C for 2 hours to obtain the emulsifier used in the present invention.

[0111] Add 30% diene terpene and 20% of the emulsifier prepared above and stir for 1 hour at a temperature of 60°C; then raise the temperature to 70°C, and react while adding 49% of water dropwise until the addition of water is complete, add 1% urotropine, continue to stir and react for 1 hour, and obtain the microemulsion type osmotic agent.

[0112] The surface tension of 0.1% is 21.45mN / m, the surface tension of 0.2% is 20.94mN / m, and the surface tension of 0.3% is 19.64mN / m.

Embodiment 4

[0114] 1. Synthesis of Fatty Alcohol Ether Grafted Comb Polymer

[0115] S1 synthesis of monomer A:C 8 h 17 (OCH 2 CH 2 ) 7 OOCCH=CHCOONHR 2

[0116] (1) maleic anhydride adds naphthalene sulfonic acid amine, does solvent with toluene, and hydroquinone is made inhibitor, in N 2 Under protection, carry out reaction at 60 ℃ for 8-10 hours, and the reaction equation is:

[0117] C 4 h 2 o 3 +R 2 NH 2 →HOOCCH=CHCOONHR 2 +H 2 O, R 2 : naphthalenesulfonic acid group;

[0118] (2) The product obtained by the reaction uses toluene as a solvent, hydroquinone as a polymerization inhibitor, and p-toluenesulfonic acid as a catalyst, and at 60 ° C with fatty alcohol polyoxyethylene ether C 8 h 17 (OCH 2 CH 2 ) 7 OH reaction, the reaction equation is: HOOCCH=CHCOONHR 2 +C 8 h 17 (OCH 2 CH 2 ) 7 OH→C 8 h 17 (OCH 2 CH 2 ) 7 OOCCH=CHCOONHR 2 +H 2 O, denoted as monomer A;

[0119] S2 Synthesis of Monomer B: Ph(OH)C 10 h 21 OOCCH=CHCOOC 6 h 13 o 5

[0120]...

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Abstract

The invention provides a microemulsion type imbibition agent, and a preparation method thereof and an oil displacement type fracturing fluid system. The microemulsion type imbibition agent is of a core-shell structure, the diameter of the microemulsion type imbibition agent ranges from 9 nm to 500 nm, and the microemulsion type imbibition agent is prepared from, by weight, 20%-35% of a solvent, 15%-25% of an emulsifier, 1%-2.5% of a complexing agent and the balance water; the emulsifier comprises the following components in percentage by weight: 35-60% of a fatty alcohol ether grafted comb-shaped polymer, 25-35% of a zwitterionic surfactant, 2-5% of perfluoroalkyl polyoxyethylene ether and the balance of water. The perfluoroalkyl polyoxyethylene ether interacts with the fatty alcohol ether grafted comb-shaped polymer active agent and the zwitterionic surfactant to form a whole, namely a shell of a core-shell structure, so that the surface tension is effectively reduced. The surface tension of a 0.3% aqueous solution of the microemulsion imbibition agent with the core-shell structure is less than 20mN / m, and the interfacial tension is less than 0.5 mN / m. The fracturing fluid system containing the microemulsion imbibition agent with the core-shell structure is high in displacement capacity, and compared with a conventional oil displacement agent, the oil displacement efficiency is higher.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a microemulsion type osmotic agent, a preparation method thereof and an oil displacement type fracturing fluid system. Background technique [0002] Many oil reservoirs in China belong to the conditions of low permeability, ultra-low permeability, shale, high temperature and deep layers. Moreover, with the deepening of unconventional block mining, the exploration and development of these areas have become more and more important. What follows is the modification of these reservoirs to enable them to develop effective production capacity. Fracturing is the most effective and commonly used stimulation measure for reservoir stimulation. [0003] So far, the main purpose of all fracturing operations is to open a fracture in the reservoir, and then fill it with proppant to form an artificial high-permeability channel in the formation. With the flowback of the fract...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/70C08F283/06C08F8/40
CPCC08F8/40C08F283/065C09K8/602C09K8/604C09K8/68C09K8/70C09K8/882C09K8/92C09K2208/12
Inventor 崔忠余康毅力游利军李峰于周良何德文李牧许卫徐冲项鹏心李霖王俊良许爽赵金姝黄武鸣
Owner 盘锦鸿鼎油气技术服务有限公司
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