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Temperature-sensitive type polymer and preparation method thereof

A polymer, temperature-sensitive technology, used in the field of oil drilling and production, can solve the problems of increased viscosity and difficult rheology control, and achieve the effect of easy application and good temperature resistance.

Inactive Publication Date: 2018-07-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the viscosity of the drilling fluid in the deep water drilling fluid increases sharply under low temperature conditions and the rheology is difficult to control, and to provide a temperature-sensitive polymer with a good control effect on the low-temperature rheology of the water-based drilling fluid and The preparation method of the polymer

Method used

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  • Temperature-sensitive type polymer and preparation method thereof
  • Temperature-sensitive type polymer and preparation method thereof
  • Temperature-sensitive type polymer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Add monomer N-vinyl caprolactam and deionized water into a three-necked flask in a certain proportion, place it in a constant temperature water bath at 45°C to keep it warm in a water bath, and 2 In the case of protective gas, turn on the stirrer and stir for 30 minutes until it is fully dissolved;

[0026] (2) The initiator is added in the three-necked flask, and the temperature of the constant temperature water bath is adjusted to 65 ° C at the same time. 2 React 4h under the situation that protection and stirrer are opened;

[0027] (3) Take off the three-necked flask, pour out the remaining water inside, add an appropriate amount of polar solvent into the three-necked flask, wait until it completely dissolves the white solid generated by the reaction, and move the obtained solution to the beaker;

[0028] (4) Take an appropriate amount of non-polar solvent in a beaker, slowly add the product-dissolved solution into the non-polar solvent, and keep stirring with ...

Embodiment 2

[0034] (1) Add monomer N-vinyl caprolactam and deionized water into a three-necked flask in a certain proportion, place it in a constant temperature water bath at 45°C to keep it warm in a water bath, and 2 In the case of protective gas, turn on the stirrer and stir for 30 minutes until it is fully dissolved;

[0035] (2) The initiator is added in the three-necked flask, and the temperature of the constant temperature water bath is adjusted to 75 ° C at the same time. 2 React 4h under the situation that protection and stirrer are opened;

[0036] (3) Take off the three-necked flask, pour out the remaining water inside, add an appropriate amount of polar solvent into the three-necked flask, wait until it completely dissolves the white solid generated by the reaction, and move the obtained solution to the beaker;

[0037] (4) Take an appropriate amount of non-polar solvent in a beaker, slowly add the product-dissolved solution into the non-polar solvent, and keep stirring with ...

Embodiment 3

[0040] (1) Add monomer N-vinyl caprolactam and deionized water into a three-necked flask in a certain proportion, place it in a constant temperature water bath at 45°C to keep it warm in a water bath, and 2 In the case of protective gas, turn on the stirrer and stir for 30 minutes until it is fully dissolved;

[0041] (2) The initiator is added in the three-necked flask, and the temperature of the constant temperature water bath is adjusted to 55 ° C at the same time. 2 React 4h under the situation that protection and stirrer are opened;

[0042] (3) Take off the three-necked flask, pour out the remaining water inside, add an appropriate amount of polar solvent into the three-necked flask, wait until it completely dissolves the white solid generated by the reaction, and move the obtained solution to the beaker;

[0043] (4) Take an appropriate amount of non-polar solvent in a beaker, slowly add the product-dissolved solution into the non-polar solvent, and keep stirring with ...

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Abstract

The invention discloses a temperature-sensitive type polymer and a preparation method thereof. According to the preparation method of the polymer, reaction temperature is controlled and salt concentration, pH (Potential of Hydrogen) value and polymer concentration of a polymerization reaction solution are controlled to prepare the temperature-sensitive type polymer with different lower critical solution temperatures (LCST). The temperature-sensitive type polymer is used as a drilling fluid additive and can improve the low-temperature rheological property of water-based drilling fluid; the changes of the plastic viscosity and the apparent viscosity within a range of 0 to 60 DEG C are reduced by 50 percent. A preparation process of the temperature-sensitive type polymer is simple and feasible and the preparation efficiency is high; the temperature-sensitive type polymer has an excellent temperature-sensitive behavior in the deep-water water-based drilling fluid; the low-temperature rheological property of the water-based drilling fluid can be extremely improved, so that the preparation method of the temperature-sensitive type polymer and the temperature-sensitive type polymer prepared by the preparation method have actual application value in a petroleum industry, especially a deep-water well drilling field.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a temperature-sensitive polymer capable of adjusting low-temperature rheology of deep-water water-based drilling fluid, a preparation method and application thereof. Background technique [0002] In the deep-water subsea area, the temperature is generally around 4°C (or even lower in some places). In this case, the drilling fluid system is very easy to form gas hydrate, and its rheology at low temperature is greatly affected. Low temperature will sharply increase the viscosity of the drilling fluid, make it difficult to control the rheology, increase the circulation resistance in the pipe string, affect the safe drilling of the narrow density window in the deep sea environment, and have a great impact on the suspension and sand-carrying ability of the drilling fluid. Therefore, controlling the low temperature rheology of drilling fluid in deep water environment is one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F126/06C09K8/035
CPCC08F126/06C09K8/035
Inventor 于政廉徐加放张瑞丁廷稷李力文王晓璞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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