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An environment-friendly hyperbranched polyguanidine acid shale intercalation inhibitor

A technology of hyperbranched poly-guanidine acid, applied in the field of oil and gas field drilling, can solve the problems of no adsorption, repeated adsorption, clay entanglement, uneven coating, etc., achieve stable performance, meet drilling requirements, and low price

Active Publication Date: 2022-04-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the polyamine inhibitors studied and applied at present have a linear structure. For linear polyamine inhibitors, they usually have an irregular linear configuration after being dissolved in water. When they are used in the shale gas drilling process , the entanglement and coating on the clay are uneven, which is easy to cause repeated adsorption or no adsorption
At the same time, the active groups generally exist at both ends of the molecular chain, so that a molecular chain usually only contains two active groups. In this case, the effect of linear polyguanidine acid inhibitors often has certain limitations. sex

Method used

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  • An environment-friendly hyperbranched polyguanidine acid shale intercalation inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Synthesis of methyl guanidinoate

[0024] Accurately weigh 4.00g of arginine and dissolve it in 100ml of anhydrous methanol, then put the arginine methanol solution in a flask, raise the temperature to 90°C under nitrogen atmosphere and stirring, and reflux for 16h. After the reaction, the arginine methyl ester was obtained by rotary evaporation at 85° C. and an absolute vacuum of less than 3000 Pa.

[0025] (2) Synthesis of hyperbranched polyguanidine acid intermediate

[0026] Accurately take by weighing 3.76g (1) gained arginine methyl ester, 2.02g N-methylpiperazine and 4.72g divinyl sulfone are dissolved in 200ml chloroform respectively, with arginine methyl ester, N-methylpiperazine solution Transfer to a three-necked flask, and add the divinyl sulfone solution by titration at 0°C under a nitrogen atmosphere with stirring, and the titration time is 25 minutes. After the titration was completed, the temperature was raised to 45° C., and the reaction was carri...

Embodiment 2

[0030] (1) Synthesis of methyl guanidinoate

[0031] Accurately weigh 3.50 g of guanidine acid and dissolve it in 100 ml of anhydrous methanol, then place the guanidine acid methanol solution in a flask, raise the temperature to 90° C. under a nitrogen atmosphere and stir, and reflux for 16 hours. After the reaction was completed, methyl guanidine was obtained by rotary evaporation at 85° C. and an absolute vacuum of less than 3000 Pa.

[0032] (2) Synthesis of hyperbranched polyguanidine acid intermediate

[0033] Accurately take by weighing 3.30g (1) gained guanidine methyl ester, 2.02g N-methylpiperazine and 4.72g divinyl sulfone are dissolved in 200ml chloroform respectively, with guanidine methyl ester solution and N-methyl piperazine The solution was transferred to a three-necked flask, and the divinyl sulfone solution was added by titration at 0° C. under a nitrogen atmosphere with stirring, and the titration time was 25 minutes. After the titration was completed, the...

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Abstract

An environment-friendly hyperbranched polyguanidino acid shale intercalation inhibitor belongs to the field of oil and gas field drilling technology. The compound is used as a raw material and synthesized according to the following steps: S1, synthesis of guanidino acid methyl ester; S2, synthesis of hyperbranched polyguanidine acid intermediate; S3, synthesis of hyperbranched polyguanidine acid. The shale intercalation inhibitor made of the hyperbranched polyguanidine acid is prepared by mixing the hyperbranched polyguanidine acid with water, wherein the mass ratio of the hyperbranched polyguanidine acid in the shale intercalation inhibitor is 0.5%‑3%. The shale intercalation inhibitor made of hyperbranched polyguanidine acid provided by the present invention has good biodegradability, is safe and non-toxic, and its inhibitory performance is significantly improved compared with that of similar intercalation inhibitors. The price is cheap, the synthesis method provided is stable and reliable, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a hyperbranched polyguanidine acid shale intercalation inhibitor. Background technique [0002] Borehole wall instability has always been a worldwide problem that needs to be overcome in the drilling process. It often leads to complex accidents such as well wall collapse, diameter shrinkage, and pipe sticking, which increases drilling time and drilling costs. According to statistics, 75% of wellbore instability problems mainly occur in shale formations, especially water-sensitive formations. Shale formations have high clay mineral content, shale gas horizontal wells have long horizontal sections, and drilling fluids are in contact with formations. If the time is long, the shale hydration will be more serious, and the wellbore instability will be more prominent. Although oil-based drilling fluid has the advantages of high temperature resistance, salt and calci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08G83/00
CPCC09K8/035C08G83/005C09K2208/12
Inventor 谢刚罗玉婧邓明毅白杨王平全罗平亚
Owner SOUTHWEST PETROLEUM UNIV
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