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Highly thixotropic emulsifier for anti-high-temperature oil-in-water drilling fluid

A technology of water-in-oil drilling fluid and high temperature resistance, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve the problems of high viscosity of emulsifier, poor rock-carrying ability and low shear force of prepared water-in-oil drilling fluid problems, achieve high emulsification efficiency, reduce surface energy, and improve rheological properties

Inactive Publication Date: 2016-03-23
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] The present invention aims to overcome the problems of high viscosity, low shear force and poor rock-carrying ability of the existing high-temperature water-in-oil drilling fluid emulsifier existing in the background technology, and provide a high-thixotropic high-temperature-resistant Emulsifier for water-in-oil drilling fluid

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0011] For the first step of reaction, put a 500ml four-neck flask on the heating mantle, and install the thermometer, stirrer, water separator and condensing device. Add 1.0mol of refined ricinoleic acid into the four-necked flask, start stirring, and pass N 2 Protection, after the air in the flask is completely replaced, slowly add 1.0mol of N,N-dimethyl-1,3-propanediamine, turn on the heating mantle switch, and slowly raise the temperature. When the temperature of the reactants in the flask rises to 120°C, keep the temperature at 120°C±2°C for reaction, and be careful not to make the temperature of the reaction mixture exceed 122°C. Observe the water separated in the water separator, when the quality of the separated water is 17.5g, take a sample to detect the acid value of the reaction mixture, and pay attention to observe the water situation. When the acid value is less than 2mgKOH / g, if dehydration cannot be observed within 10 minutes, the reaction is terminated. If th...

Embodiment 2

[0018] For the first step of reaction, put a 500ml four-neck flask on the heating mantle, and install the thermometer, stirrer, water separator and condensing device. Add 1.0mol oleic acid into the four-necked flask, start stirring, and pass N 2Protection, after the air in the flask is completely replaced, slowly add 1.0mol of N,N-dimethyl-1,3-propanediamine, turn on the heating mantle switch, and slowly raise the temperature. When the temperature of the reactants in the flask rises to 120°C, keep the temperature at 120°C±2°C for reaction, and be careful not to make the temperature of the reaction mixture exceed 122°C. Observe the water separated in the water separator, when the quality of the separated water is 17.5g, take a sample to detect the acid value of the reaction mixture, and pay attention to observe the water situation. When the acid value is less than 2mgKOH / g, if dehydration cannot be observed within 10 minutes, the reaction is terminated. If the acid value does...

Embodiment 3

[0025] For the first step of reaction, put a 500ml four-neck flask on the heating mantle, and install the thermometer, stirrer, water separator and condensing device. Add 1.0mol of refined ricinoleic acid into the four-necked flask, start stirring, and pass N 2 Protection, after the air in the flask is completely replaced, slowly add 1.0mol of N,N-dimethyl-1,3-propanediamine, turn on the heating mantle switch, and slowly raise the temperature. When the temperature of the reactants in the flask rises to 120°C, keep the temperature at 120°C±2°C for reaction, and be careful not to make the temperature of the reaction mixture exceed 122°C. Observe the water separated in the water separator, when the quality of the separated water is 17.5g, take a sample to detect the acid value of the reaction mixture, and pay attention to observe the water situation. When the acid value is less than 2mgKOH / g, if dehydration cannot be observed within 10 minutes, the reaction is terminated. If th...

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Abstract

The present invention relates to a highly thixotropic emulsifier for an anti-high-temperature oil-in-water drilling fluid. The emulsifier mainly solves the problem that an existing anti-high temperature oil-in-water drilling fluid emulsifier has high viscosity, low shear force, and a prepared oil-in-water drilling fluid is poor in cuttings transportation. The emulsifier is prepared by a mixture of two surfactants component I and component II, wherein the component I is a Gemini quaternary ammonium salt surfactant and the component II is an amide surfactant, and the mass percentage ratio of the component I and the component II is 2:1-4:1; the molecular structure of the component I is as follows: R1-N-[(CH2CHOHCH2-N-(CH3)2(CH2)3-CONH-R2)2]2+.2Cl-; and the molecular structure of the component II is: R3-CONH-R4. The highly thixotropic emulsifier for anti-high-temperature oil-in-water drilling fluid selects a raw material containing a cyclic structure to improve the ability of high temperature resistance, so that the drilling fluid can still has highly thixotropic rheology under a high temperature condition.

Description

technical field [0001] The invention relates to a treatment agent in the technical field of oil field drilling, in particular to a highly thixotropic emulsifier for water-in-oil drilling fluid with high temperature resistance. Background technique [0002] When the solution contains a small amount of surfactant, it can greatly reduce the surface (and interfacial) tension of the solution and change the interface state of the system, thereby producing a series of effects such as emulsification, wetting, foaming, and solubilization. In oilfield production, surfactants can be used as oil-in-water emulsifiers and water-in-oil emulsifiers for oilfield drilling fluids, wetting agents, foaming agents, defoamers, cleaning agents, and oil displacement agents for tertiary oil recovery. When the surfactant is used in the water-in-oil emulsified drilling fluid, the lipophilic group extends into the oil phase, and the hydrophilic group is thrown out of the oil phase due to the hydrophilic...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/36
CPCC09K8/035
Inventor 刘永贵闫晶杨智光杨决算徐永辉吴广兴宋程
Owner BC P INC CHINA NAT PETROLEUM CORP
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