High temperature resistant oil-based drilling fluid emulsifier and preparation method thereof

An oil-based drilling fluid and emulsifier technology, applied in the field of oil drilling, can solve the problems of poor high-temperature emulsification effect, large gap, and large amount of addition, and achieves the ability to ensure emulsification stability, good emulsification, and strong high temperature resistance. Effect

CN104263328BActive Publication Date: 2017-02-08BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-02-08

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Abstract

The invention discloses a high-temperature-resistant oil-base drilling fluid emulsifier which is prepared by reacting the following components in parts by weight: 9-12 parts of polyolefin, 1-3 parts of maleic anhydride, 18-22 parts of xylene, 3-5 parts of polyethylene polyamine, 2-4 parts of polyethyleneglycol and 1-3 parts of octyl phenol polyethenoxy ether. The invention also discloses a preparation method of the emulsifier. The emulsifier has better emulsifying effect on the water-in-oil drilling fluid system which uses diesel and white oil as continuous phases, has superhigh high-temperature resistance, can keep high emulsion-breaking voltage of the oil-base drilling fluid at the high temperature of 200 DEG C or so, and can enduringly ensure the emulsifying stability, rheological property and pollution resistance of the oil-base drilling fluid.
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Description

[0001] Technical field:

[0002] The invention relates to the field of petroleum drilling, in particular to a high-temperature resistant oil-based drilling fluid emulsifier and a preparation method thereof.

[0003] Background technique:

[0004] Oil-based drilling fluid has excellent characteristics such as strong inhibition, high temperature resistance, anti-pollution, and excellent protection of oil layers, and occupies an important position in the global drilling fluid market. Oil-based drilling fluid is suitable for drilling complex formations, such as highly water-sensitive formations, high-temperature and high-pressure formations in deep wells, thick salt-gypsum formations and salt-rock formations, etc., and its advantages are unmatched by water-based drilling fluids. At present, oil-based drilling fluid has become an important means of drilling high-difficulty, high-temperature deep wells, high-inclination directional wells, horizontal wells and various complex wells. ...

Examples

Embodiment 1

[0021] (1) Dissolve 9 parts of polyisobutylene (molecular weight 1000-1200) and 2 parts of maleic anhydride in 22 parts of solvent xylene, add to the reaction kettle, heat to 150°C, pressurize to 0.6MPa with nitrogen, Reaction 8h, obtain polyisobutylene succinic anhydride;

[0022] (2) Reduce the temperature in the reactor to room temperature and release the pressure, add 4 parts of polyethylene polyamine, raise the temperature to 110°C, and react for 6 hours under normal pressure, so that polyethylene polyamine and polyisobutylene succinic anhydride undergo condensation reaction;

[0023] (3) Heating up to 150° C. to recover the solvent by distillation under normal pressure. After the distillation is completed, the temperature is raised to 200° C. to recover unreacted reactants by distillation, and the obtained product is polyolefin succinimide, the primary product of the emulsifier;

[0024] (4) Evenly mix the primary product of the emulsifier with 4 parts of polyethylene gl...

Embodiment 2

[0026] (1) Dissolve 12 parts of polyisobutylene (molecular weight 1000-1200) and 1 part of maleic anhydride in 20 parts of solvent xylene, add to the reaction kettle, heat to 160 ° C, pressurize to 0.7 MPa with nitrogen, Reaction 10h, obtain polyisobutylene succinic anhydride;

[0027] (2) Reduce the temperature in the reactor to room temperature and release the pressure, add 3 parts of polyethylene polyamine, heat up to 120°C, and react for 5 hours under normal pressure, so that polyethylene polyamine and polyisobutylene succinic anhydride undergo condensation reaction;

[0028] (3) Heating up to 155° C. to distill and recover the solvent under normal pressure. After the distillation is completed, the temperature is raised to 205° C. to distill and recover the unreacted reactants. The product obtained is polyolefin succinimide, the primary product of the emulsifier;

[0029] (4) Uniformly mix the primary product of the emulsifier with 3 parts of polyethylene glycol and 3 part...

Embodiment 3

[0031] (1) Dissolve 10 parts of polyisobutylene (molecular weight 1000-1200) and 3 parts of maleic anhydride in 18 parts of solvent xylene, add to the reaction kettle, heat to 160 °C, pressurize to 0.5 MPa with nitrogen, Reaction 9h, obtain polyisobutylene succinic anhydride;

[0032] (2) Reduce the temperature in the reactor to room temperature and release the pressure, add 5 parts of polyethylene polyamine, raise the temperature to 130°C, and react for 4 hours under normal pressure, so that polyethylene polyamine and polyisobutylene succinic anhydride undergo condensation reaction;

[0033] (3) Heating up to 155° C. to distill and recover the solvent under normal pressure. After the distillation is completed, the temperature is raised to 205° C. to distill and recover the unreacted reactants. The product obtained is polyolefin succinimide, the primary product of the emulsifier;

[0034] (4) Evenly mix the primary product of the emulsifier with 2 parts of polyethylene glycol ...