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Temperature-resistant calcium-tolerant inverse emulsion polymer for drilling fluids and preparation method

A reverse emulsion and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve good effect, good stability, and improve the quality of filter cake

Active Publication Date: 2013-01-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101880354A discloses a polymer emulsion polymer and its preparation method. The average molecular weight of the obtained product can reach 6 million to 10 million, and it has good coating inhibition, but it is only limited to the drilling fluid coating inhibition, and does not involve Temperature and salt resistance

Method used

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  • Temperature-resistant calcium-tolerant inverse emulsion polymer for drilling fluids and preparation method

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Embodiment 1

[0022] Add 100kg of water to the reaction kettle, start stirring, add 200kg of 50% mass fraction of 2-acrylamido-2-methylpropanesulfonate aqueous solution, 10kg of N,N-dimethylacrylamide, 80kg of acrylamide, 0.015 kg ethylene glycol dimethacrylate, 0.015kg ethylenediaminetetraacetic acid disodium salt, 1.5kg OP-15, 5kg soda ash, stirred until fully dissolved, and the pH of the control system was 8.0 to obtain the required aqueous phase of the emulsion; Add 140kg of white oil, 10kg of Span-80 and 10kg of propylene glycol monolaurate emulsifier in the reaction kettle, stir until fully dissolved, and obtain the required oil phase; the water phase of the gained is slowly added into the oil phase under stirring, Then fully stir in the emulsification kettle for 20min to obtain the inverse emulsion of the monomer compound; put the obtained emulsion into the reaction kettle, turn on the mixer, heat up to 50°C, pass nitrogen for 15min, and add 1kg of initiator persulfuric acid with a ma...

Embodiment 2

[0024] Add 150kg of water to the reaction kettle, start stirring, add 140kg of 50% mass fraction of 2-acryloyloxy-2-methylpropanesulfonate sodium aqueous solution, 20kg of N,N-dimethylacrylamide, 130kg of acrylamide, 0.005kg ethylene glycol diacrylate, 0.005kg ethylenediaminetetraacetic acid disodium salt, 5kg OP-15, 1kg soda ash, stir until fully dissolved, control the pH of the system to be 7.5, and obtain the water phase required for the emulsion; Add 180kg of white oil, 15kg of Span-80 and 5kg of propylene glycol monolaurate emulsifier, and stir until fully dissolved to obtain the required oil phase; the resulting water phase is slowly added to the oil phase under stirring, and then in the Fully stir in the emulsification kettle for 20 minutes to obtain the inverse emulsion of the monomer compound; put the obtained emulsion into the reaction kettle, turn on the mixer, raise the temperature to 50°C, pass nitrogen for 15 minutes, and add 4kg of an initiator potassium persulfa...

Embodiment 3

[0026] Add 120kg of water to the reaction kettle, start stirring, add 180kg of 50% mass fraction of 2-acrylamido-2-methylpropanesulfonate aqueous solution, 40kg of N,N-dimethylacrylamide, 90kg of acrylamide, 0.01 kg ethylene glycol dimethacrylate, 0.01kg ethylenediaminetetraacetic acid disodium salt, 3kg OP-15, 3kg soda ash, stir until fully dissolved, control the pH of the system to be 8.0, and obtain the required aqueous phase of the emulsion; Add 160kg of white oil, 13kg of Span-80 and 8kg of propylene glycol monolaurate emulsifier in the kettle, stir until fully dissolved, and obtain the required oil phase; the resulting water phase is slowly added to the oil phase under stirring, and then Fully stir in the emulsification kettle for 20 minutes to obtain the inverse emulsion of the monomer compound; put the obtained emulsion into the reaction kettle, turn on the mixer, raise the temperature to 50°C, pass nitrogen for 15 minutes, and add 1.5kg of initiator persulfuric acid wi...

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Abstract

The invention discloses a temperature-resistant calcium-tolerant inverse emulsion polymer for drilling fluids. The polymer is prepared by polymerization of a sulfonic acid group-containing monomer water solution with a mass fraction of 50%, N, N-dimethylacrylamide, acrylamide, a crosslinking agent, water, white oil, a span-80 emulsifier, a propylene glycol monolaurate emulsifier, an OP-15 or Tween-80 emulsifier, an ammonium persulfate water solution or a potassium persulfate water solution with a mass fraction of 10% as an initiator, a sodium thiosulfate water solution with a mass fraction of 10%, an azodiisobutyl imidazoline hydrochloride solution with a mass fraction of 5%, soda ash, and an ethylenediaminetetraacetic acid disodium salt. The inverse emulsion polymer provided in the invention has good abilities of filtration loss reducing, viscosity increasing, flow pattern regulating, hydration dispersion inhibiting of clay and drill cuttings, and can improve filter cake quality, enhance drilling fluid lubricity, thus being suitable for various water-based drilling fluids and being able to be used as a high-temperature, high-salt and high-calcium drilling fluid additive.

Description

Technical field: [0001] The invention relates to a temperature-resistant and calcium-resistant inverse emulsion polymer for drilling fluid and a preparation method thereof, which belongs to the technical field of preparation methods for the synthesis of water-soluble polymer materials for petroleum drilling. technical background: [0002] Since the 1990s, acrylic acid, acrylamide, and 2-acrylamide-2-methylpropanesulfonic acid have been used as the main raw materials in China, and the polymers obtained by copolymerization have been used as drilling fluid treatment agents for temperature and salt resistance. Its good temperature and salt resistance ability has gradually attracted people's attention, and a temperature and salt resistance drilling fluid treatment agent and drilling fluid system represented by PAMS have been formed. Although this type of treatment agent has good temperature and salt resistance , but in drilling fluids with high calcium content, the operating temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/38C08F220/56C08F220/54C08F2/30C09K8/035
Inventor 王中华
Owner CHINA PETROLEUM & CHEM CORP
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