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Shale intercalation inhibitor prepared from environment-friendly hyperbranched polyamino acid

A polyamino acid and inhibitor technology, which is applied in the field of oil and gas field drilling, can solve problems such as clay entanglement, uneven coating, limited inhibition performance, and no adsorption, and achieve the effects of low price, improved inhibition performance, and stable performance

Active Publication Date: 2020-08-28
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the polyamino acid inhibitors studied and applied at present have a linear structure. For linear polyamino acid inhibitors, they usually have an irregular linear configuration after being dissolved in water. When they are used in shale gas drilling When the entanglement and coating on the clay are uneven, it 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 polyamino acid inhibitors often has certain limitations.
And it is difficult for high molecular weight polyamino acid compounds to enter the clay layer, so that its inhibitory performance is limited

Method used

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Embodiment 1

[0024] S1. Synthesis of amino acid methyl ester: Accurately weigh 3.0g of 3-methylaminoalanine and dissolve it in 100ml of anhydrous methanol, then transfer the 3-methylaminoalanine methanol solution to a 500mL three-necked flask, Under the atmosphere and stirring, the temperature was raised to 100°C, and the reaction was refluxed for 12h. After the reaction was finished, 3-methylaminoalanine methyl ester was obtained by rotary evaporation at 85°C and an absolute vacuum less than 3000Pa.

[0025] S2. Synthesis of hyperbranched polyamino acid intermediate: Accurately weigh 2.62g of 3-methylaminoalanine methyl ester obtained in step S1, 3.26g of N-phenylpiperazine and 3.92g of vinyl acrylate and dissolve them in 200ml of chloroform. Transfer the 3-methylaminoalanine methyl ester and N-phenylpiperazine solution to a three-necked flask, and add the vinyl acrylate solution by titration at 0°C under a nitrogen atmosphere with stirring, and the titration time is 25 minutes. After th...

Embodiment 2

[0028] S1. Synthesis of amino acid methyl ester: Accurately weigh 3.5g of D,L-δ-N-methylornithine and dissolve it in 100ml of anhydrous methanol, then dissolve D,L-δ-N-methylornithine in methanol Transfer to a 500 mL three-necked flask, and raise the temperature to 100° C. under stirring in a nitrogen atmosphere, and reflux for 12 h. After the reaction, the D,L-δ-N-methylornithine methyl ester was obtained by rotary evaporation at 85° C. and an absolute vacuum of less than 3000 Pa.

[0029] S2. Synthesis of hyperbranched polyamino acid intermediates: Accurately weigh 3.20 g of D,L-δ-N-methylornithine methyl ester, 3.26 g of N-phenylpiperazine and 3.92 g of vinyl acrylate obtained in step S1 and dissolve them respectively In 200ml of chloroform, transfer D,L-δ-N-methylornithine methyl ester and N-methylpiperazine solution to a 500ml three-necked flask, and titrate Add vinyl acrylate solution, titration time is 25min. After the titration was completed, the temperature was rais...

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Abstract

The invention discloses a shale intercalation inhibitor prepared from environment-friendly hyperbranched polyamino acid, and belongs to the technical field of oil and gas field drilling. The hyperbranched polyamino acid is synthesized by taking monoprimary amine amino acids with different hydrophobic chain lengths, N-phenylpiperazine and ester compounds containing diene bonds as raw materials through the following steps: S1, synthesizing amino acid methyl ester; S2, synthesizing a hyperbranched polyamino acid intermediate; and S3, synthesizing hyperbranched polyamino acid. The shale intercalation inhibitor prepared from hyperbranched polyamino acid is prepared from hyperbranched polyamino acid and water, wherein the mass ratio of hyperbranched polyamino acid in the shale intercalation inhibitor is 0.5-3%. The hyperbranched polyamino acid has good biodegradability, is safe and non-toxic, and has obviously improved inhibition performance compared with similar shale intercalation inhibitors, the raw materials are easy to obtain and low in price, and the provided synthesis method 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 shale intercalation inhibitor made of hyperbranched polyamino acid. 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C09K8/035
CPCC08G83/005C09K8/035
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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