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

A technology of inverse emulsion and drilling fluid, which is applied in the direction of drilling composition, chemical instruments and methods, etc., to achieve the effect of good effect, good stability and improvement of filter cake quality.

Active Publication Date: 2015-06-10
CHINA PETROLEUM & CHEM CORP +1
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  • 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

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

Embodiment 2

[0024] Add 150kg of water to the reactor, start stirring, add 140kg of sodium 2-acryloxy-2-methylpropanesulfonate with a mass fraction of 50%, 20kg of N,N-dimethylacrylamide, and 130kg of acrylamide. 0.005kg ethylene diacrylate, 0.005kg ethylenediaminetetraacetic acid disodium salt, 5kg OP-15, 1kg soda ash, stir until all dissolved, control the pH of the system to 7.5, and obtain the aqueous phase required for the emulsion; in the reactor Add 180kg of white oil, 15kg of Span-80 and 5kg of propylene glycol monolaurate emulsifier, stir until completely dissolved to 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 monomer compound inverse emulsion; put the obtained emulsion into the reaction kettle, turn on the mixer, heat up to 50°C, vent nitrogen for 15 minutes, and add 4 kg of 10% by weight initiator potassium persulfate aqueous solution , 4kg o...

Embodiment 3

[0026] Add 120kg of water to the reactor, start stirring, add 180kg of sodium 2-acrylamido-2-methylpropanesulfonate with a mass fraction of 50%, 40kg of N,N-dimethylacrylamide, 90kg of acrylamide, 0.01 kg ethylene dimethacrylate, 0.01 kg ethylene diamine tetraacetic acid disodium salt, 3 kg OP-15, 3 kg soda ash, stir until fully dissolved, control the pH of the system to 8.0, and obtain the aqueous phase required for the emulsion; Add 160kg of white oil, 13kg of Span-80 and 8kg of propylene glycol monolaurate emulsifier to the kettle, stir until completely dissolved to obtain the required oil phase; the obtained 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 monomer compound inverse emulsion; put the obtained emulsion into the reaction kettle, turn on the stirrer, heat up to 50°C, blow nitrogen for 15 minutes, and add 1.5 kg of 10% mass fraction of initiator persulfuric acid Ammonium aqu...

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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 calcium-resistant inverse emulsion polymer for drilling fluids and a preparation method thereof, and belongs to the technical field of synthetic preparation methods of water-soluble polymer materials for petroleum drilling. technical background: [0002] Since the 1990s, acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, etc. have been used as the main raw materials in China, and the polymer obtained by copolymerization has been used as a temperature-resistant and salt-resistant drilling fluid treatment agent. Its good resistance to temperature and salt has gradually attracted people's attention, and formed the temperature and salt resistance drilling fluid treatment agent and drilling fluid system represented by PAMS. Although this type of treatment agent has good temperature and salt resistance ability However, in drilling fluids with high calcium content, the operating temperature cannot...

Claims

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Application Information

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