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Shale Intercalation Inhibitor Made of Environmentally Friendly Hyperbranched Polyamino Acid

A polyamino acid and inhibitor technology, applied in the field of oil and gas field drilling, can solve the problems of clay entanglement, uneven coating, restraint performance limitation, repeated adsorption, etc., and achieves the effects of low price, improved restraint energy, and stable performance

Active Publication Date: 2022-02-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • 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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  • Shale Intercalation Inhibitor Made of Environmentally Friendly Hyperbranched Polyamino Acid
  • Shale Intercalation Inhibitor Made of Environmentally Friendly Hyperbranched Polyamino Acid

Examples

Experimental program
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Effect test

Embodiment 1

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

[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 solution of 3-methylaminoalanine methyl ester and N-phenylpiperazine to a three-necked flask, and add the vinyl acrylate solution dropwise at 0°C under a nitrogen atmosphere with stirring, and the dropping time is 25min. After the ...

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 The solution was transferred to a 500 mL three-necked flask, and the temperature was raised to 100° C. under stirring in a nitrogen atmosphere, and the reaction was carried out under 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 intermediate: 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, respectively Dissolve in 200ml of chloroform, transfer D,L-δ-N-methylornithine methyl ester, N-methylpiperazine solution to a 500ml three-necked flask, at 0°C, under nitrogen atmosphere and stirring, Add the vinyl acrylate solutio...

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Abstract

The invention discloses a shale intercalation inhibitor made of an environment-friendly hyperbranched polyamino acid, which belongs to the technical field of oil and gas field drilling. Piperazine and an ester compound containing a diene bond are used as raw materials for synthesis as follows: S1, synthesis of amino acid methyl ester; S2, synthesis of hyperbranched polyamino acid intermediate; S3, synthesis of hyperbranched polyamino acid. The shale intercalation inhibitor made of hyperbranched polyamino acid is prepared by combining hyperbranched polyamino acid with water, wherein the mass ratio of hyperbranched polyamino acid in the shale intercalation inhibitor is 0.5-3%. The hyperbranched polyamino acid provided by the present invention has good biodegradability, safety and non-toxicity, and the inhibition performance is significantly improved compared with similar shale intercalation inhibitors, the raw materials are easy to obtain, the price is cheap, and the synthesis method provided is stable and reliable , 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 Patents(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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