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Temperature-resistant and salt-resistant multi-component polymerization thickening agent and preparation method thereof

A temperature-resistant, salt-resistant, thickener technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of reduced strength of polymer skeleton structure, decreased performance of conventional oil displacement polymers, and unstable hydration capacity and other problems, to achieve the effect of improving aging stability, facilitating large-scale industrial production, and good water solubility

Inactive Publication Date: 2021-12-14
CNOOC TIANJIN CHEM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the proportion of low-permeability and deep oil and gas reservoirs exploited by hydraulic fracturing technology in my country has been increasing year by year. The formation temperature of some high-temperature wells is as high as 180°C, and the salinity of formation water is very high. In high-temperature and high-salt reservoirs, conventional The performance of oil-displacement polymers has declined significantly, and the production stimulation effect has declined; on the other hand, offshore fracturing is still in the development stage, and a large amount of water is required to prepare fracturing fluids. It is easiest to use seawater to prepare fracturing fluids with excellent performance. Effective means; currently existing thickeners have disadvantages such as unstable hydration ability, reduced strength of polymer skeleton structure, increased degree of hydrolysis, and easy precipitation under high calcium and magnesium ion concentrations under high temperature and high salt conditions. , it is necessary to develop thickeners with excellent performance in temperature and salt resistance

Method used

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  • Temperature-resistant and salt-resistant multi-component polymerization thickening agent and preparation method thereof
  • Temperature-resistant and salt-resistant multi-component polymerization thickening agent and preparation method thereof
  • Temperature-resistant and salt-resistant multi-component polymerization thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a temperature-resistant and salt-resistant multi-polymerization thickener, the steps are as follows:

[0029] S1. Weigh the raw material components according to the following mass percentages: 180 parts of deionized water, 80 parts of acrylamide, 20 parts of sodium 2-acrylamido-2-methylpropylsulfonate, 10 parts of vinylpyrrolidone, and 10 parts of propylene Add morpholine into the reaction kettle, heat to 70°C, stir and mix evenly at constant temperature;

[0030] S2. Introduce nitrogen into the reactor for 30 min to carry out oxygen removal operation, and add 0.1 part of ammonium persulfate, 0.1 part of sodium sulfite and 0.1 part of azobisisobutylimidazoline hydrochloride to the mixed material in step S1, drop Added for 30 min; after the dropwise addition was completed, stirred and reacted for 6 h;

[0031] S3. After the reaction is completed, after solvent precipitation, cooling and solidification, natural drying, and then shearing and pulver...

Embodiment 2

[0033] A preparation method of a temperature-resistant and salt-resistant multi-polymerization thickener, the steps are as follows:

[0034] S1. Weigh the raw material components according to the following mass percentages: 260 parts of deionized water, 80 parts of acrylamide, 20 parts of 2-acrylamido-2-methylpropyl sodium sulfonate, 6 parts of vinylpyrrolidone, 6 parts of propylene Add morpholine into the reaction kettle, heat to 60°C, stir and mix evenly at constant temperature;

[0035] S2. Introduce nitrogen gas into the reactor for 30 minutes to carry out oxygen removal operation, and add 0.067 parts of ammonium persulfate, 0.033 parts of sodium bisulfite and 0.05 parts of azobisisobutylimidazoline hydrochloride to the mixed material in step S1 Salt, added dropwise for 30 min; after the dropwise addition, stirred and reacted for 6 h;

[0036] S3. After the reaction was completed, the solvent was settled, cooled and solidified, dried naturally, and then sheared and pulver...

Embodiment 3

[0038] A preparation method of a temperature-resistant and salt-resistant multi-polymerization thickener, the steps are as follows:

[0039] S1. Weigh the raw material components according to the following mass percentages: 180 parts of deionized water, 50 parts of acrylamide, 10 parts of 2-acrylamido-2-methylpropyl sodium sulfonate, 4 parts of vinylpyrrolidone, 6 parts of propylene Add morpholine into the reaction kettle, heat to 80°C, stir and mix evenly at constant temperature;

[0040] S2. Introduce nitrogen gas into the reactor for 30 minutes to perform oxygen removal operation, and add 0.08 parts of ammonium persulfate, 0.07 parts of sodium thiosulfate and 0.05 parts of azobisisobutylimidazoline hydrochloride to the mixed material in step S1 Salt, added dropwise for 30 min; after the dropwise addition was completed, stir and react for 10 h;

[0041] S3. After the reaction, the solvent was settled, cooled and solidified, dried naturally, and then sheared and pulverized t...

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Abstract

The invention discloses a temperature-resistant and salt-resistant multi-component polymerization thickening agent and a preparation method thereof. The preparation method of the thickening agent comprises the following steps: uniformly mixing acrylamide (AM), sodium 2-acrylamide-2-methylpropanesulfonate (AMPS), vinyl pyrrolidone (NVP) and acryloylmorpholine (ACMO) according to a certain proportion, adding a proper amount of a redox initiator and a water-soluble azo initiator, carrying out a stirring reaction at a constant temperature of 60-90 DEG C under an anaerobic condition, carrying out solvent sedimentation, conducting cooling and solidification, naturally conducting airing, and then conducting shearing and crushing to obtain the temperature-resistant and salt-resistant multi-component polymerization thickening agent. The temperature-resistant and salt-resistant multi-component polymerization thickening agent has the advantages of good salt resistance, hydrolysis resistance, temperature resistance, shearing resistance and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a temperature-resistant and salt-resistant multi-component polymeric thickener and a preparation method thereof, which are suitable for low-permeability reservoir fracturing or high-permeability refracturing systems. Background technique [0002] With the development of oil and gas reservoirs in the middle and later stages, oil and gas exploration and development are developing towards unconventional oil and gas reservoirs, and low-permeability and high-temperature unconventional oil and gas reservoirs such as tight sandstone gas and shale gas account for an increasing proportion. Such oil and gas resources are in urgent need of development. Hydraulic fracturing technology, as the main means of increasing production in low-permeability oil and gas fields, is widely used in major oil and gas fields in China. In recent years, the proportion of low-permeability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/10C08F220/58C08F4/40C09K8/68C09K8/88
CPCC08F220/56C08F4/40C09K8/68C09K8/882C08F220/585C08F226/10C08F220/58
Inventor 周柄男滕大勇丁秋炜张昕张宇侯洋于晓微柳宏伟王素芳靳晓霞周立山
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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