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Polyamine inhibitor for water-based drilling fluid and preparation method thereof

A technology for water-based drilling fluid and polyamine inhibitor, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of shale inhibition effect and high temperature resistance performance not satisfactory.

Active Publication Date: 2018-03-13
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

At present, there are a number of invention patent disclosures about the structure or preparation method of polyamine inhibitors, such as CN201110334894.4, CN201110340245.5, CN201110356922.2, CN201110392249.8, CN201410345892.9, but the shale of the product is obtained by the existing method Inhibition effect and high temperature resistance are still not satisfactory

Method used

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  • Polyamine inhibitor for water-based drilling fluid and preparation method thereof
  • Polyamine inhibitor for water-based drilling fluid and preparation method thereof
  • Polyamine inhibitor for water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 6.01kg of ethylenediamine and 18kg of water into a double-layer glass reactor with a capacity of 50L and mix them. Slowly add 9.25kg of epichlorohydrin under stirring conditions. Heat is released during the reaction, and circulating cooling water is introduced into the interlayer. Control the reaction temperature not to exceed 80°C, add epichlorohydrin within 45 minutes, keep stirring, start heating when the temperature drops to 50°C, control the temperature, and the reaction temperature is 75-80°C, add 1.05kg diethanolamine after 2 hours of reaction, continue After reacting for 2 hours and cooling to room temperature, a light yellow viscous liquid was obtained, which was the polyamine inhibitor for the water-based drilling fluid. Gained polyamine inhibitor molecular structure simplified formula is as follows:

[0025]

Embodiment 2

[0027] Add 7.31kg of triethylenetetramine and 14kg of water into a double-layer glass reactor with a capacity of 50L and mix them. Slowly add 4.63kg of epichlorohydrin under stirring conditions. Heat is released during the reaction, and circulating cooling water is introduced into the interlayer. , control the reaction temperature not to exceed 80°C, add epichlorohydrin within 30 minutes, keep stirring, and start heating when the temperature drops to 50°C, the temperature control reaction temperature is 70-73°C, add 0.50kg mass fraction after 3 hours of reaction 30% dimethylamine aqueous solution was continued to react for 1.8 h, and cooled to room temperature to obtain a light yellow viscous liquid, which was the polyamine inhibitor for the water-based drilling fluid. The molecular structure simplified formula of gained polyamine inhibitor is as follows:

[0028]

Embodiment 3

[0030] Add 9.45kg of tetraethylenepentamine and 20kg of water into a double-layer glass reactor with a capacity of 50L and mix them. Slowly add 4.63kg of epichlorohydrin under stirring conditions. Heat is released during the reaction, and circulating cooling water is introduced into the interlayer. , control the reaction temperature not to exceed 80°C, add epichlorohydrin within 35 minutes, keep stirring, start heating when the temperature drops to 50°C, control the temperature, the reaction temperature is 74-77°C, add 0.24kg of diethylamine after 2 hours of reaction , continue the reaction for 1.8h, and cool to room temperature to obtain a light yellow viscous liquid, which is the polyamine inhibitor for the water-based drilling fluid; the molecular structure of the polyamine inhibitor obtained is as follows:

[0031]

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Abstract

The invention discloses a polyamine inhibitor for water-based drilling fluid and a method for preparing the polyamine inhibitor. A structural formula of the polyamine inhibitor is shown, wherein an n can be 0 or 1 or 2 or 3; an m ranges from 100 to 200; an R<1> is -CH<3> or -CH<2>CH<3> or -CH<2>CH<2>OH. The method for preparing the polyamine inhibitor for the water-based drilling fluid includes mixing polyamine organic compounds and water with one another to obtain mixtures; slowly adding epichlorohydrin into the mixtures; enabling the epichlorohydrin and the mixtures to react with one another; adding chain growth terminators into the mixtures; cooling products until the temperatures of the products reach the room temperature after reaction is completed so as to obtain the polyamine inhibitor for the water-based drilling fluid. The polyamine inhibitor for the water-based drilling fluid and the method have the advantages that the polyamine inhibitor is excellent in shale inhibition and can be normally used under the condition of temperature of 180 DEG C; the method is simple and is easy to implement.

Description

technical field [0001] The invention relates to the field of oil, natural gas and coalbed methane exploration and development, in particular to a polyamine inhibitor for water-based drilling fluid and a preparation method thereof. Background technique [0002] Drilling is a necessary means for the exploration and development of oil and gas resources. During the drilling process, wellbore instability often occurs, especially in shale formations, where wellbore collapse is very frequent. According to statistics, the wellbore instability caused by shale accounts for 10% of the incidence of wellbore instability. more than 90 percent. Therefore, people have been constantly looking for ways to control the instability of shale wellbore. [0003] Oil-based drilling fluid is currently the most reliable way to solve the problem of wellbore instability in shale. The reason is that oil-based drilling fluid will not cause hydration and expansion of the wellbore wall. It is widely used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08G73/02
CPCC08G73/022C09K8/035C09K2208/12
Inventor 解洪祥刘音王红科赵福祥赵鹏喻化民薛莉韩秋玲
Owner BC P INC CHINA NAT PETROLEUM CORP
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