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Environment-friendly defoaming agent for drilling fluid and preparation method thereof

A drilling fluid and defoaming agent technology, applied in the field of water-based drilling fluid, can solve the problems of unstable quality, comprehensive quality can not effectively meet the requirements of safe drilling, environmental protection, drilling fluid foaming, foaming, etc., to achieve good water solubility , Guarantee safe and fast drilling operation, low cost effect

Active Publication Date: 2020-10-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the drilling of conventional wells, horizontal wells, complex structure wells, and exploratory wells in Changqing Oilfield, Ordos Basin, drilling fluid foaming and foaming often exist. In order to eliminate foam and maintain the performance of drilling fluid stability, drilling fluid defoaming There are many types of defoamers for drilling fluids. With the strong implementation of the new two laws (new environmental protection law and new safety production law), in order to protect the environment and protect water sources, biological toxicity and non-biodegradable Defoamers used to prevent irreparable environmental pollution, and some drilling fluid defoamers currently used, due to the selection of raw materials, production and processing techniques, etc., the final products contain substances that are toxic and harmful to the environment and human health to varying degrees , and the quality is unstable, coupled with the pursuit of high profits in the market, the overall quality of some of the products cannot effectively meet the needs of safe drilling and environmental protection

Method used

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preparation example Construction

[0035] The present invention also protects a preparation method of an environmentally friendly defoamer for drilling fluid, comprising the following steps:

[0036] 1). Using polyhydroxymethyl hydroxyethyl siloxane and hydroxymethyl silicone oil as reaction initiators, under the action of an acidic catalyst, carry out graft reaction with 1,4-butanediol and epoxide to obtain mid product;

[0037] 2). Add lye to neutralize the acidic catalyst of S1 and form an alkaline environment, and the intermediate product undergoes organic grafting reaction with 1,4-butanediol and epoxide under alkaline conditions to form a hydrophilic group;

[0038] 3). The above-mentioned hydrophilic group reacts with maleic anhydride to form lactone acid, and further undergoes an organic grafting reaction with the grafting monomer, and connects aminoethyl and hydroxyethyl groups on the product to obtain the described Environmental protection defoamer for drilling fluid.

[0039] The specific preparati...

Embodiment 1

[0047] The invention provides an environmentally friendly defoamer for drilling fluid, which consists of the following components in terms of mass percentage: 20% polyhydroxymethyl hydroxyethyl siloxane, 25% hydroxymethyl silicone oil, 1,4-butanediol 5%, propylene oxide 5%, sulfuric acid 3.5%, maleic anhydride 10%, bishydroxyethylamine 6.5%, sodium hydroxide 4%, antioxidant (antioxidant T501) 5%, and the balance is water.

[0048] The preparation method of the environmentally friendly defoamer for drilling fluid provided by the present invention comprises the following steps: add the required polyhydroxymethyl hydroxyethyl siloxane and hydroxymethyl silicone oil into the closed reaction kettle according to the order of feeding, and start stirring , feed pure nitrogen and continue to stir for 0.5h. When the temperature of the reactor reaches 120°C-130°C, add the required 1,4-butanediol, propylene oxide, and sulfuric acid and stir for 2h; Add the formulated amount of water into ...

Embodiment 2

[0053] The environmentally friendly defoamer for drilling fluid provided in this embodiment is composed of the following raw materials in the following mass percentages: polyhydroxymethyl hydroxyethyl siloxane: 30%, hydroxymethyl silicone oil: 15%, 1,4-butane Alcohol: 7.5%, propylene oxide: 3%, sulfuric acid: 5%, maleic anhydride: 10%, bishydroxyethylamine 5%, antioxidant T501: 5%, and the balance is sodium hydroxide aqueous solution.

[0054] The preparation process of the environmentally friendly defoamer for drilling fluid is as follows: sequentially add the required polyhydroxymethyl hydroxyethyl siloxane and hydroxymethyl silicone oil into the closed reaction kettle, start stirring, feed pure nitrogen and continue stirring for 0.5h , when the temperature of the reaction kettle reaches 120°C to 130°C, the required 1,4-butanediol, propylene oxide, and sulfuric acid are added uniformly and stirred for 2 hours, and the required sodium hydroxide aqueous solution is prepared dur...

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Abstract

The invention provides an environment-friendly defoaming agent for drilling fluid and a preparation method of the environment-friendly defoaming agent. The environment-friendly defoaming agent is prepared from the following components by mass percentage: 10%-30% of polyhydroxymethyl hydroxyethyl siloxane, 15%-35% of hydroxymethyl silicone oil, 4%-12% of 1, 4-butanediol, 3%-7% of epoxide, 2%-5% ofa catalyst, 7%-15% of maleic anhydride, 5%-8% of a grafting monomer, 3%-6% of an antioxidant and the balance alkali liquor. The environment-friendly defoaming agent is good in water solubility, free of fluorescence and free of any influence on geological logging, foam and bubbles in the drilling fluid can be effectively eliminated, the performance stability of the drilling fluid is maintained, andsafe and rapid drilling operation and well control safety in the drilling process are guaranteed. The environment-friendly defoaming agent is low in raw material cost, simple in preparation method and required equipment condition, easy to implement, capable of meeting the requirement for the drilling fluid defoaming agent in the special well drilling construction process, capable of greatly reducing the production cost and good in economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of water-based drilling fluid, and in particular relates to an environment-friendly defoamer for drilling fluid and a preparation method thereof. Background technique [0002] During the drilling of conventional wells, horizontal wells, complex structure wells, and exploratory wells in Changqing Oilfield, Ordos Basin, drilling fluid foaming and foaming often exist. In order to eliminate foam and maintain the performance of drilling fluid stability, drilling fluid defoaming There are many types of defoamers for drilling fluids. With the strong implementation of the new two laws (new environmental protection law and new safety production law), in order to protect the environment and protect water sources, biological toxicity and non-biodegradable Defoamers used to prevent irreparable environmental pollution, and some drilling fluid defoamers currently used, due to the selection of raw materials, production and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08G77/38C08G77/388
CPCC09K8/035C08G77/38C08G77/388
Inventor 黎金明周丰陈在君杨斌张建斌张小平雷江郭康陈磊王勇强苏欢董宏伟蔺文洁俞浩杰郑玉辉赵雷杜松涛郝超张长庚
Owner BC P INC CHINA NAT PETROLEUM CORP
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