Temperature-resistant and salt-resistant fracturing fluid imbibition agent, and preparation method and application thereof

A temperature-resistant, salt-resistant, fracturing fluid technology, applied in the fields of oil exploration, transportation and chemical industry, can solve the problems of large formation adsorption loss, harsh reaction conditions, easy hydrolysis failure, etc. Mechanistically clear effect

Active Publication Date: 2020-10-02
SHANDONG XINGANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An imbibition surfactant for fracturing is disclosed in the prior art (Zhang Xuepeng et al., "Preparation and Application of Ibsorption Surfactant for Fracturing" [J], Shaanxi University of Science and Technology, 2019). Suction synergistic surfactant ANS, general molecular formula R(OR 1 ) 5 OOCCH (SO 3 Na)CH 2 COO(OR 1 ) 5 R, the reaction conditions are relatively harsh, and it is not easy to operate. The reaction product contains a functional group ester group, which is easily hydrolyzed and invalidated; a kind of osmotic agent for fracturing is also disclosed (Wang Xiaoxiang et al., "Research on Imbibition of Fracturing Fluid to Enhance Oil Recovery" [ J], Xi'an Shiyou University, 2018), the fracturing absorbent cetyltrimethylammonium bromide (CTAB) is a cationic surfactant, which has a large adsorption loss to the formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] 1.1 Preparation of lipophilic capillary

[0034] 1.1.1 Capillary specification: the standard capillary inner diameter is 0.35 mm, followed by carbon tetrachloride, benzene: acetone: ethanol = 7:1.5:1.5 (volume ratio) for ultrasonic treatment for 30 minutes to remove surface organic substances;

[0035] 1.1.2 Then use dilute hydrochloric acid solution (1:10) and hydrofluoric acid solution (10%) for ultrasonication to roughen and activate the capillary surface for 30 minutes; use deionized water for ultrasonic cleaning to remove residual acid until pH >6.5, drying at 105°C;

[0036] 1.1.3 Configure the aging oil according to the ratio, and the aging oil is composed of crude oil: aviation kerosene: 90# asphalt = 2:5:3; completely immerse the treated capillary in the aging oil, and age at 60°C for 2-4 weeks ;

[0037] 1.1.4 Take out the capillary, soak it with kerosene for 2 minutes to clean the asphalt deposited on the inner and outer walls of the capillary, as long as i...

Embodiment 1

[0065] 25g Br(CH 2 ) 7 COOC 2 h 5 Dissolve 5g of N-methylimidazole in 50g of absolute ethanol successively, react under reflux at a reaction temperature of 50°C for 5h, wash with ether, evaporate the solvent with a rotary evaporator, and dry in vacuum at 60°C for 4h to obtain an intermediate 1-(Ethyl 7-carboxylate)methyl-3-methylimidazolium bromide.

[0066] Take out 25g of 1-(7-ethyl carboxylate) methyl-3-methylimidazolium bromide and 10g of 37% concentrated hydrochloric acid and add them in turn to 60g of acetonitrile solvent. After fully dissolving, react at a reaction temperature of 60°C After 5h, the intermediate 1-(7-carboxylic acid)methyl-3-methylimidazolium bromide was obtained.

[0067] 15g C 4 h 9 (Me)SiHO[(Me) 2 SiO] 2 C 9 h 19 and 0.0065g catalyst [Bmim] 4 Mo 8 o 26 Sequentially add 40g of DMF into a closed reactor (equipped with a thermometer and a condensation reflux device), heat up to 80-85°C and start stirring, pass nitrogen to remove oxygen, and...

Embodiment 2

[0076] 30g Br(CH 2 ) 9 COOC 2 h 5 and 10g of N-methylimidazole were successively dissolved in 50g of acetonitrile, refluxed at a reaction temperature of 55°C for 7h, washed with ether, and evaporated with a rotary evaporator to remove the solvent, and dried in vacuo at 65°C for 5h to obtain the intermediate 1- (9-Carboxylic acid ethyl ester) methyl-3-methylimidazolium bromide salt.

[0077] Take out 30g 1-(9-carboxylate ethyl ester) methyl-3-methylimidazolium bromide salt and 15g 37% concentrated hydrochloric acid and join in the 60g dehydrated alcohol solvent successively, after fully dissolving, in reaction temperature is 50 ℃ After 4 hours of reaction, the intermediate 1-(9-carboxylic acid)methyl-3-methylimidazolium bromide was obtained.

[0078] 20g C 9 h 19 (Me)SiHO[(Me) 2 SiO] 2 C 9 h 19 and 0.0225g catalyst [Bmim] 4 BF 4 Sequentially add 40g of tetrahydrofuran into a closed reactor (equipped with a thermometer and a condensing reflux device), heat up to 80-8...

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PUM

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Abstract

The invention provides a temperature-resistant and salt-resistant fracturing fluid imbibition agent, and a preparation method and application thereof, and belongs to the technical field of oil exploitation, transportation and chemical engineering. The target product is obtained by taking Br(CH2)mCOOC2H5, N-methylimidazole, R1(Me)SiHO[(Me)2SiO]nR2 as reaction raw materials and enabling a reaction to be carried out stably under the cooperation of a preferred process. The temperature-resistant and salt-resistant fracturing fluid imbibition agent provided by the invention can show good imbibitionperformance in an environment with a mineralization degree of 19334 mg/L (wherein the total amount of calcium ions and magnesium ions is 514 mg/L) and a high temperature of 150 DEG C.

Description

technical field [0001] The invention belongs to the technical fields of petroleum exploitation, transportation and chemical industry, and in particular relates to a temperature-resistant and salt-resistant fracturing fluid imbibrator, a preparation method and application thereof. Background technique [0002] Low-permeability oil and gas reservoirs generally have the characteristics of "small porosity, low pore pressure, and low reservoir permeability". Homogenization adversely affects development. Therefore, the recovery factor of low permeability oil and gas reservoirs is relatively low. At the same time, due to its complex mining process and high mining costs, its economic benefits are also low. The national average recovery rate of low-permeability oilfields is 23.3%, which is obviously low. However, low-permeability oil and gas reservoirs, especially ultra-low-permeability oil and gas reservoirs, are of great value due to their extensive resources. [0003] Oilfield ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/10B01J31/02B01J31/04C09K8/62C09K8/68
CPCB01J31/0284B01J31/0285B01J31/04B01J2231/4277C07F7/0838C07F7/0878C09K8/602C09K8/62C09K8/68
Inventor 齐书磊李慎伟杨姗丁锡刚吴庆凯李金平胡朋朋姜力华秦玉斌祝东明
Owner SHANDONG XINGANG CHEM
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