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A shale intercalation inhibitor prepared from branched tertiary amine type polyamine with ultralow molecular weight

A molecular weight, tertiary amine type technology, applied in the preparation of amino compounds from amines, organic chemistry, drilling compositions, etc., can solve problems such as the limitation of inhibition performance, and achieve improved inhibition performance, reduced probability of occurrence, and good water solubility. Effect

Active Publication Date: 2019-05-21
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And it is difficult for high molecular weight polyamine compounds to enter the clay layer, so that its inhibitory performance is limited

Method used

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  • A shale intercalation inhibitor prepared from branched tertiary amine type polyamine with ultralow molecular weight
  • A shale intercalation inhibitor prepared from branched tertiary amine type polyamine with ultralow molecular weight
  • A shale intercalation inhibitor prepared from branched tertiary amine type polyamine with ultralow molecular weight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Diethylenetriamine and dimethylallylamine are used as raw materials to prepare ultra-low molecular weight branched tertiary amine polyamines by step-by-step synthesis, and the specific steps are as follows:

[0036] (1) Synthesis of G1 ultra-low molecular weight branched tertiary amine polyamine: Accurately weigh 0.1 mole of diethylenetriamine and 0.1 mole of dimethylallylamine and dissolve them in 80 mL of anhydrous methanol respectively, and diethylenetriamine Transfer the methanol solution of dimethyl allylamine to a round bottom flask, and slowly add the methanol solution of dimethylallylamine into the round bottom flask with a constant pressure separatory funnel at 25°C and stir. After the dropwise addition, heat up Heat to reflux for 8 hours at 95°C. After the reaction, use a rotary evaporator to evaporate the solvent at 105°C and an absolute vacuum of less than 3000Pa to obtain G1 ultra-low molecular weight branched tertiary amine polyamine. The molecular formula...

Embodiment 2

[0047] Using diethylenetriamine and dimethylallylamine as raw materials, a one-pot method is used to prepare ultra-low molecular weight branched tertiary amine polyamines. The specific steps are as follows

[0048] Accurately weigh diethylenetriamine and dimethylallyl with a molar ratio of 1:5 and dissolve them in 100mL of anhydrous methanol, and the diethylenetriamine is 0.1 mole, and the dimethyl The methanol solution of allylamine was added dropwise to the methanol solution of diethylenetriamine. After the dropwise addition, the temperature was raised to 100°C, and the reaction was heated under reflux for 12 hours. Distill under reduced pressure and evaporate the solvent to obtain G5 ultra-low molecular weight branched tertiary amine polyamine. Molecular formula of G5 ultra-low molecular weight branched tertiary amine polyamine: Molecular formula of G5 ultra-low molecular weight branched tertiary amine polyamine: C 29 h 68 N 8 , exact molecular weight: 528.557, molar mas...

Embodiment 3

[0051] Using ethylenediamine and dimethylallylamine as raw materials, the ultra-low molecular weight branched tertiary amine polyamine is prepared by a step-by-step synthesis method, and the specific steps are as follows:

[0052] (1) Synthesis of G1 ultra-low molecular weight branched tertiary amine polyamine: Take 0.1 mole of ethylenediamine and 0.1 mole of dimethylallylamine and dissolve them in 80 mL of anhydrous methanol respectively, transfer the methanol solution of ethylenediamine to Add the methanol solution of dimethylallylamine to the round bottom flask at 25°C using a constant pressure separatory funnel slowly into the round bottom flask and stir. After the dropwise addition, heat up to 95°C. Heat to reflux for 8 hours. After the reaction is completed, use a rotary evaporator to evaporate the solvent at 105° C. and an absolute vacuum of less than 3000 Pa to obtain G1 ultra-low molecular weight branched tertiary amine polyamine. The molecular formula of G1 ultra-low...

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Abstract

A shale intercalation inhibitor prepared from branched tertiary amine type polyamine with ultralow molecular weight is provided. The inhibitor is prepared by mixing the branched tertiary amine type polyamine with ultralow molecular weight and water according to a ratio. The branched tertiary amine type polyamine is prepared from a polyamine compound and a tertiary amine compound containing an olefinic bond through a substep synthesis method or a one-pot synthesis method, wherein the polyamine compound is one of alkyl diamine, polyethylene polyamine and polyamine with a low molecular weight. The branched tertiary amine type polyamine is nontoxic and harmless, a synthetic method thereof is simple and high in yield, raw materials are simple and easily available, and the branched tertiary amine type polyamine is suitable for large-scale industrial production. The inhibitor prepared from the branched tertiary amine type polyamine has obviously improved inhibiting effects than products of the same type, can effectively reduce the probability of instable well walls due to shale hydration dispersion, and can completely meet drilling demands for various complex well conditions.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field drilling, in particular to a shale intercalation inhibitor made of ultra-low molecular weight branched tertiary amine polyamine. Background technique [0002] Wellbore instability often leads to downhole complex accidents such as wellbore collapse, borehole shrinkage, and pipe sticking, which increases drilling time and cost. 75% of wellbore instability mainly occurs in shale formations, especially water-sensitive formations. The content of clay minerals in shale formations is high, the horizontal section of shale gas horizontal wells is long, the contact time between drilling fluid and formation is long, shale hydration is more serious, and wellbore instability is more prominent. Although oil-based drilling fluid has obvious advantages in wellbore stability, lubrication and anti-sticking, inhibition of shale hydration expansion, formation slurrying and rapid drilling, etc., due to its ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C07C209/68C07C211/14
Inventor 谢刚肖玉容邓明毅黄丹超罗平亚江林峰聂梦圆
Owner SOUTHWEST PETROLEUM UNIV
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