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A shale intercalation inhibitor made of low molecular weight branched quaternary ammonium salt

A low molecular weight, quaternary ammonium salt technology, applied in the field of oil and gas drilling, to achieve the effect of stable and reliable technology, reduced wellbore instability, easy aggregation and flocculation

Active Publication Date: 2021-08-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to address the defects and deficiencies in the above-mentioned prior art, a shale intercalation inhibitor made of low molecular weight branched quaternary ammonium salts, to solve the problem of intercalation inhibition of clay mineral surface hydration, the present invention The invention has the advantages of high efficiency and non-toxicity, high positive charge density, good inhibition performance, good anti-mud bag performance, etc., and provides a preparation method at the same time, the method is stable and reliable, and the yield is high

Method used

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  • A shale intercalation inhibitor made of low molecular weight branched quaternary ammonium salt
  • A shale intercalation inhibitor made of low molecular weight branched quaternary ammonium salt
  • A shale intercalation inhibitor made of low molecular weight branched quaternary ammonium salt

Examples

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Embodiment 1

[0046] Embodiment 1, using diethylenetriamine and trimethylvinylammonium as raw materials, adopts step-by-step synthesis to prepare low-molecular-weight branched quaternary ammonium salts, and the specific steps are as follows:

[0047] (1) Synthesis of G1: accurately weigh diethylenetriamine and trimethylvinylammonium in equimolar parts, and dissolve them in equal-quality acetone respectively, wherein the mass concentration of diethylenetriamine is 50%, Transfer the acetone solution of diethylenetriamine to a three-necked flask, raise the temperature to 40°C, and use a peristaltic pump to drop the acetone solution of trimethylethyleneammonium into the three-necked flask at a constant speed at a rate of 1d / S under a nitrogen atmosphere. Stir at a speed of 800r / min while adding dropwise. After the dropwise addition, heat up to 105°C and heat to reflux for 6h. After the reaction is completed, distill off the acetone under reduced pressure at 105°C and absolute vacuum less than 30...

Embodiment 2

[0058] Using diethylenetriamine and trimethylethyleneammonium as raw materials, a low molecular weight branched quaternary ammonium salt is prepared by a one-pot synthesis method, and the specific steps are as follows:

[0059] Accurately weigh 1 mole portion of diethylenetriamine and 5 mole portions of trimethylvinyl ammonium, and dissolve them in equal amounts of acetone respectively, wherein the mass concentration of diethylenetriamine is 50%, and diethylenetriamine Transfer the acetone solution of amine to a three-necked flask, raise the temperature to 40°C, and use a peristaltic pump to drop the acetone solution of trimethylvinyl ammonium into the three-necked flask at a uniform speed at a rate of 1d / S under a nitrogen atmosphere. Stir at a speed of 800r / min. After the dropwise addition, heat up to 105°C and heat to reflux for 10h. After the reaction is completed, distill off acetone under reduced pressure at 105°C and absolute vacuum less than 3000Pa to obtain the crude p...

Embodiment 3

[0062]Using hexamethylenediamine and trimethylvinylammonium as raw materials, a low-molecular-weight branched quaternary ammonium salt is prepared by a step-by-step synthesis method, and the specific steps are as follows:

[0063] (1) Synthesis of G1: Accurately weigh hexamethylenediamine and trimethylvinylammonium in equimolar parts, and dissolve them in equal-quality ethanol respectively, wherein the mass concentration of hexamethylenediamine is 50%. Transfer the ethanol solution of diamine to a three-necked flask, raise the temperature to 45°C, and use a peristaltic pump to drop the ethanol solution of trimethylethylene ammonium into the three-necked flask at a speed of 1d / S under a nitrogen atmosphere. While stirring at a speed of 900r / min, after the dropwise addition, the temperature was raised to 105°C, and heated to reflux for 6 hours. After the reaction was completed, the ethanol was distilled off under reduced pressure at 105°C and the absolute vacuum degree was less t...

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Abstract

The invention discloses a shale intercalation inhibitor made of low-molecular-weight branched quaternary ammonium salt, which belongs to the technical field of oil and gas field drilling. The shale inhibitor is prepared by mixing low-molecular-weight branched quaternary ammonium salt and water in proportion , wherein the mass ratio of the low-molecular-weight branched quaternary ammonium salt in the shale intercalation inhibitor is 0.5-10%, and the low-molecular-weight branched quaternary ammonium salt uses polyamine compounds and quaternary ammonium salts containing ethylenic bonds as raw materials 1. Synthesize by step-by-step synthesis method or one-pot synthesis method. The specific steps are: configure the raw materials into a solution of corresponding concentration, add the above solution dropwise and mix, heat to reflux, and then undergo vacuum distillation, washing, suction filtration, and drying A low molecular weight branched quaternary ammonium salt is obtained. The low-molecular-weight branched quaternary ammonium salt shale intercalation inhibitor synthesized by the invention is non-toxic and harmless, has good inhibitory ability, and its effect is far superior to similar products, and its temperature resistance can reach 260°C, which is especially suitable for ultra-high temperature deep well drilling. .

Description

technical field [0001] The invention belongs to the technical field of oil and gas field drilling, and in particular relates to a shale intercalation inhibitor made of low-molecular-weight branched quaternary ammonium salt. Background technique [0002] Well wall instability often leads to downhole complex accidents such as well wall collapse, diameter shrinkage, and pipe sticking, which increases drilling time and drilling costs. 75% of wellbore instability mainly occurs in shale formations, especially water-sensitive formations. Although oil-based drilling fluid has obvious advantages in terms of wellbore stability, lubrication and anti-sticking, inhibition of shale hydration expansion, formation slurrying and rapid drilling, etc., due to its serious environmental pollution, it is difficult to treat and the treatment cost is too high Gradually, researchers at home and abroad have focused their attention on water-based drilling fluids. Therefore, it is a trend in the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/63C07C209/60C09K8/035
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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