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Coated inhibitor for drilling fluid and its preparation method and application

A technology of coating inhibitors and drilling fluids, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost of polymerization reaction, high cost of drilling fluid, high monomer price, etc., and achieve the purpose of inhibiting hydration dispersion , prevent well wall collapse, easy biodegradable effect

Active Publication Date: 2016-03-23
北京培康佳业技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The residual monomers of such polymers (such as acrylamide, acrylic acid, acrylonitrile, etc.) are toxic substances, and these residual monomers will cause pollution when they enter the environment
In addition, the monomers used to produce these polymeric coatings are more expensive, and the cost of the polymerization reaction is also higher, resulting in a higher cost of drilling fluids using this coating

Method used

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  • Coated inhibitor for drilling fluid and its preparation method and application
  • Coated inhibitor for drilling fluid and its preparation method and application
  • Coated inhibitor for drilling fluid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 250 parts of konjac gum by weight and dissolve in a mixed solution of 900 parts of 95% ethanol and 220 parts of water, then add 2.4 parts of anhydrous sodium carbonate, 6 parts of glycerin, 280 parts of 30% trimethylamine and 420 parts of epoxy chloride Propane was reacted in the reaction kettle under reflux condensation conditions for 4.5 hours, centrifuged for half an hour, the solid particles were separated, and dried at 100°C for 7 hours to obtain the natural polymer strong coating inhibitor for drilling fluid in this example .

Embodiment 2

[0029] Take 260 parts of Tianqing glue by weight and dissolve in a mixed solution of 1000 parts of 95% ethanol and 230 parts of water, then add 2.5 parts of anhydrous sodium carbonate, 8 parts of glycerin, 290 parts of 30% trimethylamine and 410 parts of epoxy Chloropropane was reacted in the reaction kettle under the condition of reflux condensation for 5 hours, centrifuged for half an hour to separate the solid particles, and dried at 90°C for 8 hours to obtain the natural polymer strong coating inhibitor for drilling fluid in this example. agent.

Embodiment 3

[0031] Take 240 parts of coriander gum by weight and dissolve it in a mixed solution of 900 parts of 95% ethanol and 240 parts of water, then add 2.6 parts of anhydrous sodium carbonate, 9 parts of glycerin, 300 parts of 30% trimethylamine and 430 parts of epoxy Chloropropane was reacted in the reaction kettle under reflux condensation conditions for 4.5 hours, centrifuged for half an hour to separate solid particles, and dried at 105°C for 6 hours to obtain the natural polymer strong coating inhibitor for drilling fluid in this example. agent.

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Abstract

The invention provides a coating inhibitor for a drilling fluid as well as a preparation method and application thereof. The preparation method of the coating inhibitor comprises the following steps of: mixing a vegetable gelatin, anhydrous sodium carbonate, ethanol, water, glycerol, trimethylamine and epoxy chloropropane at a weight ratio of (240-260):(2.4-2.6):(750-1,000):(200-500):(5-10):(80-100):(400-440), and enabling the mixed system to react for 4.5-5 hours under the reflux condition to obtain the coating inhibitor. The coating inhibitor provided by the invention is a natural polymer strong coating inhibitor and has the advantages of strong coating inhibiting performance, strong salt and calcium resisting capacity, no biotoxicity and low cost, and in addition, the coating inhibitor can be biodegraded easily, is simple in synthesis method and is favorable for protecting the oil-gas layer.

Description

technical field [0001] The invention relates to a coating inhibitor for oil field drilling fluid and its preparation method and application, in particular to a natural polymer strong coating inhibitor for drilling fluid prepared from natural vegetable gum as the main raw material, its preparation method and application. Background technique [0002] Coating agent is an important additive used in drilling fluid system. Its function is to effectively coat cuttings, prevent cuttings and mud shale from hydrating and dispersing, and prevent well wall from collapsing. Form a protective film to prevent drill cuttings from adhering to each other and increasing the screening resistance. [0003] In recent years, relevant personnel in the industry have successively developed various coating agents. For example, CN101942060A discloses a method for preparing an environment-friendly coating agent for drilling fluids. The monomers used are methacrylamide and acrylamide, but the preparati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/20
CPCC09K8/035C09K8/206
Inventor 姚少全
Owner 北京培康佳业技术发展有限公司
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