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A kind of clay stabilizer and preparation method thereof

A clay stabilizer and emulsifier technology, which is applied in the field of clay stabilizer and its preparation, can solve the problems of high temperature resistance and poor erosion resistance, and achieve the effects of enhancing erosion resistance, preventing hydration expansion, and improving water solubility

Inactive Publication Date: 2020-11-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a clay stabilizer and its preparation method to solve the problems of existing clay stabilizers with poor resistance to high temperature and erosion

Method used

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  • A kind of clay stabilizer and preparation method thereof
  • A kind of clay stabilizer and preparation method thereof
  • A kind of clay stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of 1-allyl-3-phenylthiourea:

[0046]Mix phenylisothiocyanate (PITC) and acetonitrile according to the volume ratio of 1:3 and stir in a water bath at room temperature, according to the moles of phenylisothiocyanate (PITC) and allylamine (AP) Add allylamine (AP) dropwise at a ratio of 1:1, react for 3 hours, then remove the solvent by rotary evaporation at 45°C, recrystallize twice with acetonitrile, and dry in vacuum to obtain 1-allyl-3-benzene thiourea (SN). The obtained 1-allyl-3-phenylthiourea was in the form of white powder.

Embodiment 2

[0048] The preparation method of 1-allyl-3-phenylthiourea:

[0049] Mix phenylisothiocyanate (PITC) and acetonitrile according to the volume ratio of 1:4 and stir in a water bath at room temperature, according to the moles of phenylisothiocyanate (PITC) and allylamine (AP) Add allylamine (AP) dropwise at a ratio of 1:1.2, react for 5 hours, then remove the solvent by rotary evaporation at 50°C, recrystallize 3 times with acetonitrile, and dry in vacuum to obtain 1-allyl-3-benzene thiourea (SN).

Embodiment 3

[0051] The preparation method of 1-allyl-3-phenylthiourea:

[0052] Phenyl isothiocyanate (PITC) and acetonitrile were mixed according to the volume ratio of 1: (3-4) and stirred in a water bath at room temperature. The molar ratio of AP) is 1:1.1, and allylamine (AP) is added dropwise, reacted for 4 hours, and then the solvent is removed by rotary evaporation at 48°C, recrystallized with acetonitrile for 3 times, and dried in vacuum to obtain 1-allylamine (AP). -3-Phenylthiourea (SN).

[0053] Preparation of Cationic Acrylamide Copolymer P(AM-DAC-SN) Containing Thiourea Structure

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Abstract

The invention discloses a clay stabilizer and a preparation method thereof, belonging to the technical field of oil exploitation. The copolymer-guanidine salt supramolecular compound clay stabilizer is prepared by carrying out copolymerization on 1-allyl-3-phenylthiourea (SN), acrylamide (AM) and (2-(acryloyloxy)ethyl)trimethylammonium chloride (DAC) to obtain a ternary cationic copolymer P(AM-DAC-SN), and then compounding the ternary cationic copolymer with an h-PAMAM type guanidine salt compound; the clay stabilizer has the beneficial effects that the clay stabilizer is high in water solubility, can be fully dispersed in clay and wrap the surfaces of clay particles so as to prevent the entry of water molecules, can effectively inhibit the hydration swelling of the clay particles, and ishigh in high temperature resistance and strong in scouring resistance.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a clay stabilizer and a preparation method thereof. Background technique [0002] In the development of oil and gas fields, because clay minerals widely exist in oil reservoirs, the hydration expansion and dispersion of shale often lead to problems such as wellbore instability, pipe sticking and wellbore purification. These problems not only affect the quality and engineering efficiency of drilling, but also cause serious safety accidents. Therefore, the research on clay stabilizers is of great significance. For the consideration of environmental protection and cost control, oilfield workers have been devoting themselves to the development of water-soluble polymers to inhibit the hydration of clay in shale for nearly three decades, so as to solve the problems of wellbore instability, Problems such as drill sticking and severe formation slurry. However, the existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/34C08F226/02C08G73/02
CPCC08F220/56C08G73/028C09K8/035C09K2208/12C08F220/34C08F226/02
Inventor 苟绍华费玉梅段明罗浩王婷婷罗威武元鹏彭川张慧超
Owner SOUTHWEST PETROLEUM UNIV