Inverse emulsion polymer and preparation method and application thereof in preparation of water-based drilling fluid

A technology of inverse emulsion and polymer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve the effects of convenient use, anti-calcium and enhancement and improvement of lubricity

Active Publication Date: 2017-03-22
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In drilling fluid treatment agents, there are few reports on inverse emulsion polymers resistant to high temperatures (greater than 200°C)

Method used

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  • Inverse emulsion polymer and preparation method and application thereof in preparation of water-based drilling fluid
  • Inverse emulsion polymer and preparation method and application thereof in preparation of water-based drilling fluid

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[0035] The present invention also provides a method for preparing the above-mentioned temperature-resistant emulsion polymer, that is, the invention provides a method for preparing an inverse emulsion polymer, comprising the following steps:

[0036] 1) emulsifying the oil phase material and the water phase material to obtain a monomer emulsion;

[0037] The oil phase material includes white oil; the water phase material includes monomer A, monomer B, monomer C, the first emulsifier and water; the monomer A is selected from water-soluble propylene sulfonate; the Monomer B is selected from one or more of acryloyl morpholine, vinyl caprolactam and vinyl morpholine; the monomer C is selected from acrylate compounds containing polyoxyethylene and alkyl;

[0038] 2) The monomer emulsion obtained in step 1) is polymerized in the presence of an initiator to obtain an inverse emulsion polymer.

[0039] In the embodiment of the present invention, the oil-phase material and the water-p...

Embodiment 1

[0061] Add 55kg of water into the reaction kettle, start stirring, and add 100kg of monomer A (sodium 2-acryloyloxy-2-methylpropanesulfonate) aqueous solution with a mass fraction of 50% after dissolving, 15kg of monomer B (vinyl caprolactam ), 5kg monomer C (alkylphenol polyoxyethylene ether methacrylate, its EO value n=6~10) and 1.8kgTween-80, stir until completely dissolved, control the pH value of the system=7.5, and obtain the water phase .

[0062] Add 92.5kg of white oil and 13.2kg of Span-80 into the reaction kettle, and stir until completely dissolved to obtain an oil phase.

[0063] Put the oil phase and the water phase into the emulsification kettle, stir at a speed of 1000 rpm, and fully stir for 20 minutes to obtain a monomer emulsion.

[0064] Put the above-mentioned monomer emulsion into the reactor, turn on the mixer, heat up to 50° C., pass nitrogen for 15 minutes, add 0.6 kg of 10% potassium persulfate solution, 0.3 kg of 10% sodium metabisulfite solution, ...

Embodiment 2

[0066] Add 75kg of water into the reaction kettle, start stirring, and after dissolving, add 140kg of monomer A (sodium 2-acryloyloxybutylsulfonate) aqueous solution with a mass fraction of 50%, 45kg of monomer B (acryloylmorpholine), 15kg Monomer C (polyethylene glycol methyl ether acrylate, with an average molecular weight of 300-950), 3.5 kg of Tween-80, stirred until completely dissolved, and the pH of the system was controlled to be 9 to obtain an aqueous phase.

[0067] Add 110kg of white oil and 21.5kg of Span-80 into the reaction kettle, and stir until completely dissolved to obtain an oil phase.

[0068] Put the oil phase and the water phase into the emulsification tank, stir at a speed of 2000 rpm, and fully stir for 20 minutes to obtain a monomer emulsion.

[0069] Put the above-mentioned monomer emulsion into the reaction kettle, turn on the mixer, heat up to 50°C, pass nitrogen for 15 minutes, add 4kg of potassium persulfate solution with a mass fraction of 10%, 2...

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Abstract

The invention provides an inverse emulsion polymer and a preparation method and application thereof, the method is as follows: first, emulsification of an oil phase material and a water phase material which includes monomers A, B and C, a first emulsifier and water to obtain monomer emulsion; and polymerization of the monomer emulsion in the presence of an initiator to obtain the inverse emulsion polymer, wherein the monomer A is selected from water soluble allyl sulfonate; the monomer B is selected from one or more of acryloyl morpholine, vinyl caprolactam and vinyl morpholine, and the monomer C is selected from acrylate compounds comprising polyoxyethylene and alkyl. The temperature and salt resistance, calcium resistance and inhibiting capability of the inverse emulsion polymer are further enhanced, during application of the inverse emulsion polymer as a drilling fluid treatment agent, the inverse emulsion polymer not only has the effect of good filtrate loss reduction, viscosity increase, flow type adjustment, inhibition of hydration dispersion of clay and drilling cuttings at high temperature, can improve the quality of filter cake, improves drilling liquid lubrication, and is applicable to all types of water-based drilling fluids.

Description

technical field [0001] The invention relates to the technical field of polymer materials for petroleum drilling fluids, in particular to an inverse emulsion polymer, its preparation method and its application in the preparation of water-based drilling fluids. Background technique [0002] Drilling fluid is a circulating flushing medium used in the drilling process, mainly composed of dispersion medium (continuous phase), dispersed phase and additives or treatment agents. Since the 1980s, the domestic use of monomers such as acrylic acid and acrylamide as the main raw material has been one of the most widely used drilling fluid treatment agents. It has developed rapidly and is widely used in various fields. In a kind of water-based drilling fluid, it can play the role of increasing viscosity, reducing fluid loss, coating flocculation or regulating flow. [0003] Traditional polymer treatment agents for drilling fluids are mainly powder products, and the production process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/38C08F220/58C08F2/32C09K8/24
Inventor 王中华
Owner 中石化石油工程技术服务有限公司
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