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Synthesis of hyperbranched polylysine tertiary amine intercalation inhibitor and water-based drilling fluid

A polylysine tertiary amine and inhibitor technology, which is applied in the field of oil and gas field drilling, can solve problems such as the inability to effectively suppress well wall instability, achieve high yield, low price, and suppress hydration expansion

Pending Publication Date: 2022-04-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem of wellbore instability caused by conventional inhibitors being unable to effectively inhibit shale hydration expansion, the present invention provides a synthesis method of hyperbranched polylysine tertiary amine intercalation inhibitor, which can effectively inhibit shale formation The problem of hydration expansion, so as to achieve the purpose of stabilizing the well wall

Method used

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  • Synthesis of hyperbranched polylysine tertiary amine intercalation inhibitor and water-based drilling fluid
  • Synthesis of hyperbranched polylysine tertiary amine intercalation inhibitor and water-based drilling fluid

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Embodiment 1

[0027] The preparation of hyperbranched polylysine tertiary amine: 0.5molN6-acetyl-L-lysine is dissolved in 100ml methanol at normal temperature, then N6-acetyl-L-lysine solution is placed in airtight container , under the conditions of nitrogen atmosphere and stirring, reflux reaction for 12h, and then the reaction product was distilled under reduced pressure to obtain N6-acetyl-L-lysine methyl ester; 0.3molN6-acetyl-L-lysine methyl ester and 0.3mol of bis(vinylsulfone methyl) ether was dissolved in 100ml of organic solvent respectively, and bis(ethylene Sulfone methyl) ether solution, after the dropwise addition is completed, heat up to 65°C for reflux reaction for 8h and then distill under reduced pressure to obtain hyperbranched polylysine; take 0.2mol hyperbranched polylysine and dissolve it in 100ml organic solvent, 0.2mol1- Methyl-2-propene-1-aminomethanol was dissolved in 50ml of organic solvent, and was added dropwise to hyperbranched polylysine under nitrogen atmosph...

Embodiment 2

[0029] The preparation of hyperbranched polylysine tertiary amine: 0.5molN6-acetyl-L-lysine is dissolved in 100ml methanol solution at normal temperature, then N6-acetyl-L-lysine solution is placed in airtight container , under the conditions of nitrogen atmosphere and stirring, reflux reaction for 15h, and then the reaction product was distilled under reduced pressure to obtain N6-acetyl-L-lysine methyl ester; 0.3molN6-acetyl-L-lysine methyl ester and 0.3mol 2-methylene-succinic acid 1,4-divinyl ester were dissolved in 100ml organic solvent respectively, and N6-acetyl-L-lysine methyl ester 2-methylene-succinic acid 1,4-divinyl ester solution was added dropwise in the solution, after the dropwise addition was completed, the temperature was raised to 70° C. for reflux reaction for 10 h, and then the hyperbranched polylysine was obtained by distillation under reduced pressure; 0.2mol hyperbranched polylysine was dissolved in 100ml organic solvent, 0.2mol 1-methyl-2-propene-1-ami...

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Abstract

The invention discloses synthesis of a hyperbranched polylysine tertiary amine intercalation inhibitor and a water-based drilling fluid. The hyperbranched polylysine tertiary amine intercalation inhibitor is prepared by mixing hyperbranched polylysine tertiary amine and water, wherein the mass ratio of the hyperbranched polylysine tertiary amine in the drilling fluid is 0.5%-5%. Synthesis raw materials of the hyperbranched polylysine tertiary amine are an ester substance containing a polyethylenic bond, a lysine substance containing secondary amine and an alcohol substance with low molecular weight, and an end capping reagent is 1-methyl-2-propylene-1-amino methanol or 1-ethyl-2-propylene-1-amino methanol. The drilling fluid comprises the hyperbranched polylysine tertiary amine provided by the invention. The drilling fluid can effectively inhibit shale hydration expansion. The shale intercalation inhibitor prepared from the hyperbranched polylysine tertiary amine provided by the invention is non-toxic and harmless, and the inhibition performance of the shale intercalation inhibitor is obviously improved compared with that of similar intercalation inhibitors.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to the synthesis of a hyperbranched polylysine tertiary amine intercalation inhibitor and a water-based drilling fluid containing the inhibitor. Background technique [0002] Borehole wall instability is one of the problems that seriously affect the efficiency of oil and gas drilling and production. The direct or indirect economic losses caused by hole wall instability, diameter shrinkage, diameter expansion, pipe sticking and even well collapse accidents are as high as billions of dollars every year. At present, 75% of the drilled or drilled formations belong to shale formations, and 90% of wellbore instability problems occur in shale formations. This is due to the strong water sensitivity of shale. When the shale formation encounters water, it will produce severe hydration, resulting in hydration expansion and dispersion of shale, resulting in a decrease in the ...

Claims

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Application Information

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IPC IPC(8): C08G69/48C08G69/42C09K8/24
Inventor 谢刚谷硕黄进军邓明毅罗玉婧范莉雷震
Owner SOUTHWEST PETROLEUM UNIV
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