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Preparation method of high-temperature-resistant clay stabilizer for fracture acidizing

A technology of clay stabilizer and fracturing acidification, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of frequent migration of clay particles, low formation permeability, low oil and gas production, etc., and achieve good market application The value, the synthetic method is simple, and the equipment has no corrosion effect

Active Publication Date: 2016-08-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims to propose a preparation method of a high-temperature resistant clay stabilizer for fracturing and acidification to solve the problems of clay swelling, frequent migration of clay particles, poor stability, low formation permeability, and low oil and gas production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add polyethylene glycol (molecular weight: 3000) and thionyl chloride with a molar ratio of 1:1.5 into the reactor, mix well, add pyridine dropwise to adjust the pH of the solution to 8, heat up to 78°C, and heat to reflux for 5 hours , to obtain the intermediate polyethylene chloride;

[0025] (2) The intermediate polyethylene chloride prepared by step (1) is added in the reactor container, and under nitrogen protection conditions, ammonia solution is added in the container, the intermediate polyethylene chloride and the The molar ratio of ammonia water is 1:4, the temperature is raised to 115° C., and the reaction is carried out for 5 hours to obtain a solid mixture of polyethylenediamine and ammonium chloride;

[0026] (3) Dissolve the solid mixture of polyethylenediamine and ammonium chloride in water, add dropwise ethylenediamine of the same molar number as the solid mixture into the solution, mix well, and then add 3 times the amount of the mixed mixture The ...

Embodiment 2

[0030] (1) Add polyethylene glycol (molecular weight: 12000) and thionyl chloride with a molar ratio of 1:1.2 into the reactor, mix well, add 1mol / L sodium carbonate solution dropwise to adjust the pH of the solution to 10, and heat up to 80°C , heated to reflux for 4h to obtain the intermediate polyethylene chloride;

[0031] (2) The intermediate polyethylene chloride prepared by step (1) is added in the reactor container, and under nitrogen protection conditions, ammonia solution is added in the container, the intermediate polyethylene chloride and the The molar ratio of ammonia water is 1:6, the temperature is raised to 120° C., and the reaction is carried out for 5 hours to obtain a solid mixture of polyethylenediamine and ammonium chloride;

[0032] (3) Dissolve the solid mixture of polyethylenediamine and ammonium chloride in water, add dropwise ethylenediamine of the same molar number as the solid mixture into the solution, mix well, and then add three times the amount ...

Embodiment 3

[0036] (1) Add polyethylene glycol (molecular weight: 400) and thionyl chloride with a molar ratio of 1:1.4 into the reactor, mix well, add 2mol / L sodium bicarbonate solution dropwise to adjust the pH of the solution to 9, and heat up to 75 °C, heated to reflux for 3 hours to obtain the intermediate polyethylene chloride;

[0037] (2) The intermediate polyethylene chloride prepared by step (1) is added in the reactor container, and under nitrogen protection conditions, ammonia solution is added in the container, the intermediate polyethylene chloride and the The molar ratio of ammonia water is 1:5, the temperature is raised to 110° C., and the reaction is carried out for 6 hours to obtain a solid mixture of polyethylenediamine and ammonium chloride;

[0038] (3) Dissolve the solid mixture of polyethylenediamine and ammonium chloride in water, add dropwise ethylenediamine of the same molar number as the solid mixture into the solution, mix well, and then add three times the amo...

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Abstract

The invention provides a preparation method of a high-temperature-resistant clay stabilizer for fracture acidizing. The method comprises the following steps: adding polyethyleneglycol and thionyl chloride in a certain ratio into a reaction kettle, adding an alkali solution to regulate the pH value of the solution, heating to react under reflux to obtain polychloroethane, adding the polychloroethane and ammonia water in a certain ratio into the reaction kettle, heating to react to obtain a polyethylenediamine-ammonium chloride solid mixture, dissolving the polyethylenediamine-ammonium chloride solid mixture in water, dropwisely adding ethylenediamine and acid liquor into the solution to obtain a viscous yellow liquid mixture, adding an inorganic salt, uniformly mixing, and drying by distillation to remove water and solvent, thereby obtaining the high-temperature-resistant clay stabilizer for fracture acidizing. The high-temperature-resistant clay stabilizer for fracture acidizing has favorable inhibiting actions on expansion, dispersion and migration of clay, has the advantages of excellent clay expansion resistance, favorable solubility, long effective period, no corrosiveness for equipment, low synthesis cost and simple synthesis method, and has favorable market application value.

Description

technical field [0001] The invention belongs to the technical field of fracturing and acidizing fluid system construction for deep wells, and in particular relates to a preparation method of a high-temperature-resistant clay stabilizer for fracturing and acidizing. Background technique [0002] With the overexploitation of oil fields, the oil layers that are easier to recover are decreasing day by day. At present, it is developing toward deep wells and unconventional oil and gas reservoirs to develop oil and gas. These reservoirs are characterized by deep burial, low permeability and high temperature. Fracturing and acidizing stimulation work is still the most effective stimulation technology in the exploitation process of this kind of oil and gas reservoirs. The clay stabilizer is an indispensable core additive in fracturing and acidizing fluid systems. Its function is to effectively inhibit clay expansion, improve system performance, increase formation permeability, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/48C08G65/34C09K8/68
CPCC08G65/34C08G65/48C09K8/68C09K8/885C09K2208/12
Inventor 刘音陈世春牛增前常青李洪俊
Owner BC P INC CHINA NAT PETROLEUM CORP
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