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Emulsifier for novel high-temperature water-in-oil drilling fluid

A water-in-oil drilling fluid and high temperature resistance technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of insufficient wetting of useful solid phase, poor rock-carrying ability, low shear force, etc.

Inactive Publication Date: 2013-12-04
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

However, domestic typical water-in-oil drilling fluid emulsifiers are mainly Span80, stearic acid and oleic acid, etc., which react with lime to form calcium soap, and use the principle of directional wedge to emulsify the inner phase water droplets, stabilize the emulsion, and have low surface activity. Poor performance, insufficient wetting effect on useful solid phases, etc. In the field drilling process, it is easy to cause problems such as high viscosity of drilling fluid, low shear force, poor rock-carrying ability, etc., which limit the application of water-in-oil drilling fluid

Method used

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  • Emulsifier for novel high-temperature water-in-oil drilling fluid
  • Emulsifier for novel high-temperature water-in-oil drilling fluid
  • Emulsifier for novel high-temperature water-in-oil drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 96g of tall oil and add it to a magnetic stirrer for preheating. When heated to 70°C, add 40g of N,N-dimethylpropylenediamine, heat and stir the reactant, and when the temperature rises to 140°C, water begins to precipitate. It indicates that the reaction has started, and no more water is produced after 14 hours, indicating that the reaction is over, and the intermediate product (I) is obtained, which is put into a sample bottle and labeled; take 99g of epichlorohydrin and 50g of dodecylamine, heat and stir the reactant , after reacting at 130°C for 13 hours, remove the excess epichlorohydrin by vacuum distillation to obtain the intermediate product (II), put it into a sample bottle and label it; take 100g of the intermediate product (I) and 48g of the intermediate product (II) , heating and stirring the reactant, and reacting at 170°C for 25 hours for quaternization reaction to obtain the main emulsifier DQGC sample ① for high temperature resistant water-in-oil em...

Embodiment 2

[0022] Weigh 130 g of abietic acid and add it to a magnetic stirrer for preheating, heat to 130° C., add 40 g of N,N-dimethylpropylenediamine, and heat and stir the reactant. When the temperature rises to 170°C, the reaction starts, and no more water is produced after 14 hours, indicating that the reaction is over, and the intermediate product (I) is obtained, which is put into a sample bottle and labeled; take 108g of epichlorohydrin and 100g of tetradecylamine , heating and stirring the reactant, after reacting at 135°C for 12h, remove the excess epichlorohydrin by vacuum distillation to obtain the intermediate product (II), put it into a sample bottle and label it; take 100g of the intermediate product (I) and 26g The intermediate product (II), heated and stirred the reactant, reacted at 175°C for 24 hours for quaternization reaction, and obtained the main emulsifier DQGC sample for high temperature resistant water-in-oil emulsified drilling fluid②.

[0023] Weigh 130 g of ...

Embodiment 3

[0026] Weigh 96g of tall oil and add it to a magnetic stirrer for preheating. When heated to 70°C, add 40g of N,N-dimethylpropylenediamine, and heat and stir the reactant. When the temperature rises to 140°C, water begins to precipitate, indicating that the reaction begins, and no more water is generated after 14 hours, indicating that the reaction is over, and the intermediate product (I) is obtained, which is put into a sample bottle and labeled; Propane 75g and dodecylamine 50g, heat and stir the reactant, react at 130°C for 12h, get the intermediate product (II), put it into a sample bottle and label it; take 100g of the intermediate product (I) and 33g of the intermediate product (II) ), heated and stirred the reactants, reacted at 160°C for 24 hours for quaternization reaction, and obtained the main emulsifier DQGC sample for high temperature water-in-oil drilling fluid ③.

[0027] Weigh 96g of tall oil and add it to a magnetic stirrer for preheating. When heated to 70°C...

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Abstract

The invention relates to an emulsifier for a novel high-temperature water-in-oil drilling fluid. The emulsifier comprises the following components in percentage by weight: a main emulsifier DQGC and an auxiliary emulsifier DQNS, wherein the main emulsifier DQGC is a Gemini quaternary ammonium salt surfactant; the auxiliary emulsifier DQNS is an amide surfactant; the molecular structures of the main emulsifier DQGC and the auxiliary emulsifier DQNS are as follows: [(R1CONH(CH2)3N(CH3)2CH2CHOHCH2)2NR2]2+.2Cl-R1CONH(CH2)3N(CH3)2, in the formula, R1 is C17H33, C17H31 and C19H29, and R2 is C12H25. According to the emulsifier, better oleophylic and hydrophilic abilities can be obtained, the emulsifying ability is enhanced, and the stability of the water-in-oil drilling fluid is improved.

Description

technical field [0001] The invention relates to a surfactant in the technical field of oil field drilling, in particular to an emulsifier for high temperature resistant water-in-oil drilling fluid. Background technique [0002] Surfactants can be used as defoamers, emulsifiers, wetting agents, foaming agents and detergents according to their specific functions, and have a wide range of applications in many fields. In oilfield production, surfactants can be used as oil-in-water emulsifiers and water-in-oil emulsifiers for oilfield drilling fluids, as well as oil displacement agents for tertiary oil recovery. When the surfactant is used in the water-in-oil emulsified drilling fluid, it can significantly reduce the oil-water interfacial tension, make the water phase dispersed in the base oil phase in the form of stable small droplets, and form a wellbore stability that can protect the reservoir It has good effect and can be used for drilling in water-sensitive formations, salt...

Claims

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Application Information

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IPC IPC(8): C09K8/36
Inventor 闫晶杨智光徐永辉刘永贵张坤刘振华宋涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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