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Flocculant for nano-micron inferior solid-phase polymers in oil-based drilling fluid and preparation method of flocculant

An oil-based drilling fluid, nano-technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of inability to remove nano-micron useless solid phase, unfavorable flocculant flocculation, and inability to use, etc. The effect of repeated utilization, less dosage, and fast flocculation rate

Active Publication Date: 2020-12-04
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

On the one hand, it is because the existing flocculants are almost insoluble in non-polar base oils and cannot be used at all; on the other hand, the useless solid phase in oil-based drilling fluids is dispersed in strong non-polar base oils. It is not conducive to the flocculant to play a flocculation effect
[0004] At present, oil-based drilling fluids that are repeatedly used at home and abroad are demulsified, separated, recycled and reused, which is still a waste treatment technology in essence, and cannot quickly and easily remove nano-micron useless solid phases through efficient flocculation

Method used

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  • Flocculant for nano-micron inferior solid-phase polymers in oil-based drilling fluid and preparation method of flocculant
  • Flocculant for nano-micron inferior solid-phase polymers in oil-based drilling fluid and preparation method of flocculant
  • Flocculant for nano-micron inferior solid-phase polymers in oil-based drilling fluid and preparation method of flocculant

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preparation example Construction

[0012] In an exemplary embodiment of the present invention, the preparation method of oil-based drilling fluid nano-micron inferior solid-phase polymer flocculant comprises:

[0013] Step 1, dissolving the cationic diallyl ammonium chloride monomer and the methacrylate monomer in the solubilizer at a mass ratio of 1:1-3 to obtain a first solution. Such as the use of cationic diallyl ammonium chloride monomer and methacrylate monomer with a mass ratio of 1:1, 1:1.5, 1:2, 1:2.5 or 1:3. The solubilizer can be ethanol, tetrahydrofuran or dimethylformamide.

[0014] Cationic diallyl ammonium chloride monomer structure general formula is as following formula (1):

[0015]

[0016] Among them, R 1 , R 2 Represents an alkyl group having 10 to 16 carbon atoms.

[0017] The structural formula of methacrylate monomer is as following formula (2):

[0018]

[0019] Among them, R 3 Represents an alkyl group having 10 to 16 carbon atoms.

[0020] In step 2, the dissolved oxygen ...

example 1

[0033] Weigh 5g of cationic diallyl ammonium chloride monomer (R1, R2 has 10 carbon atoms), 15g of methacrylate monomer (R3 has 16 carbon atoms), and add them in turn to a flask containing 50mL of ethanol , stirred for 10 minutes to dissolve. Slowly feed nitrogen into the solution in the flask for 30 minutes, then seal the flask, then add 0.1 g of azobisisobutyronitrile, and react at 70°C for 7 hours to obtain a cloudy product, then dry and grind the obtained product to obtain a flocculant (hereinafter referred to as Example 1 flocculant for short).

example 2

[0035] Weigh 5g of cationic diallyl ammonium chloride monomer (R1, R2 has 12 carbon atoms), 15g of methacrylate monomer (R3 has 16 carbon atoms), and add them in turn to a flask containing 50mL of ethanol , stirred for 10 minutes to dissolve. Slowly feed nitrogen into the solution in the flask for 30 minutes, then seal the flask, then add 0.1 g of azobisisobutyronitrile, and react at 70°C for 7 hours to obtain a cloudy product, then dry and grind the obtained product to obtain a flocculant (hereinafter referred to as Example 2 flocculant for short).

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Abstract

The invention provides a flocculant for nano-micron inferior solid-phase polymers in an oil-based drilling fluid and a preparation method of the flocculant. The flocculant is prepared from two monomers, namely cationic diallyl ammonium chloride and methacrylate, through free radical copolymerization. In the field of oil and gas field chemistry, the flocculant can effectively flocculate nano-micronuseless solid phases in the oil-based drilling fluid, so the particle sizes of the nano-micron useless solid phases are increased to form large and compact flocs which be conveniently removed by solid control equipment, thereby improving the repeated utilization rate of the oil-based drilling fluid; the flocculation rate of the flocculant is high, the adding amount of the flocculant is small, andthe flocculation efficiency of the flocculant is high; and with the flocculant, inferior solid phases with negatively-charged surfaces can be selectively flocculated, and useful solid phases such asbarite and the like with uncharged surfaces are hardly flocculated.

Description

technical field [0001] The invention relates to the technical field of oil-based drilling fluid solid-phase treatment, in particular to a nano-micron inferior solid-phase polymer flocculant for oil-based drilling fluid and a preparation method thereof. Background technique [0002] Oil-based drilling fluids that are repeatedly used will have higher and higher levels of useless solids, and the particle size of the solids is mostly below 2 microns, which is difficult for solid control equipment to remove. These nano-micron solid phases will not only increase the viscosity and shear force of the drilling fluid, make the rheological properties of the drilling fluid worse or even unusable, but also slow down the mechanical drilling speed, reduce the drilling efficiency and increase the drilling cost. [0003] The flocculant can agglomerate and enlarge the useless solid phase of nanometer and micrometer through flocculation, so as to meet the particle size requirement of solid con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F226/02C09K8/32
CPCC08F220/1818C08F226/02C09K8/32
Inventor 景岷嘉王星媛陆灯云蒋官澄袁志平谢意李晓阳王兰贺垠博陶怀志杨梦莹李武全
Owner BC P INC CHINA NAT PETROLEUM CORP