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Temperature-resistant and salt-resistant cationic polyacrylamide and preparation method thereof

A polyacrylamide, temperature-resistant and salt-resistant technology, applied in the field of temperature-resistant and salt-resistant cationic polyacrylamide for oil fields and its preparation, can solve the application requirements that cannot meet the conditions of higher temperature and salinity, and cannot meet the application requirements , weak adsorption performance and other problems, to achieve the effect of increasing the initiation efficiency, stable free radical release rate, and improving adsorption

Active Publication Date: 2021-08-10
SINOPEC NANJING RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1814637A discloses a preparation method of temperature-resistant and salt-resistant polyacrylamide, which can improve the temperature-resistant and salt-resistant performance of PAM by introducing sulfonic acid groups, ultrafine inorganic substances and micro-crosslinking agents that are not sensitive to salt. However, it can only meet the conditions of salinity lower than 10000mg / L and temperature lower than 65°C, and cannot meet the application requirements of higher temperature and salinity conditions.
[0006] CN103772602B discloses a temperature-resistant and salt-resistant copolymer and its preparation method. It is prepared by using acrylamide, hydrolyzed acrylamide and N-vinylpyrrolidone as monomers through an aqueous solution. Although the polymer has excellent temperature-resistant and salt-resistant properties, it has It can only meet the requirements of salinity lower than 20000mg / L and temperature lower than 85℃, but cannot meet the application requirements of higher temperature and salinity conditions
[0008] The above-mentioned modified polyacrylamide improves the temperature and salt resistance of polyacrylamide to a certain extent, but for most of the anionic polyacrylamide, its adsorption performance in the formation is weak, and there are problems such as not being resistant to erosion

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  • Temperature-resistant and salt-resistant cationic polyacrylamide and preparation method thereof
  • Temperature-resistant and salt-resistant cationic polyacrylamide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Place a four-necked flask equipped with a stirrer, a thermometer, a constant pressure funnel and a vent tube in a constant temperature water bath, add 2.0 g of N-acryloylmorpholine (ACMO), 42.5 g of acrylamide (AM), methacryloylpropane Trimethylammonium chloride (MAPTAC) 2.5g, N-vinylpyrrolidone (NVP) 3g, deionized water 200g, stir to dissolve completely, nitrogen gas 30mim, heat up to 20°C, and then slowly dropwise add 0.025g Composite initiator (m KPS :m VA044 :m DMAPAM =1.5:1:1) of aqueous solution 10g, after the dropwise addition, continue to flow nitrogen for 30min, slowly raise the temperature to 40°C, react for 3h and discharge. The colloid is granulated, dried and pulverized to obtain powdery heat-resistant and salt-resistant cationic polyacrylamide. The viscosity-average molecular weight is 5 million, and the cationic content is 5%. The viscosity retention rate aged in brine with a salinity of 30000 mg / L and a temperature of 120 °C is 80.1%.

Embodiment 2

[0036] Place a four-necked flask equipped with a stirrer, a thermometer, a constant pressure funnel and a vent tube in a constant temperature water bath, add 5.0 g of N-acryloylmorpholine (ACMO), 37.5 g of acrylamide (AM), methacryloylpropane Trimethyl ammonium chloride (MAPTAC) 2.5g, N-vinylpyrrolidone (NVP) 5g, deionized water 200g, stir to dissolve completely, nitrogen gas 30mim, heat up to 30°C, and then slowly dropwise add 0.15g Composite initiator (m KPS :m VA044 :m DMAPAM =1:1:1) of aqueous solution 10g, after the dropwise addition, continue to flow nitrogen for 30min, slowly raise the temperature to 50°C, react for 3h and discharge. The colloid is granulated, dried and pulverized to obtain powdery heat-resistant and salt-resistant cationic polyacrylamide. The viscosity-average molecular weight is 10 million, and the cationic content is 5%. The viscosity retention rate aged in brine with a salinity of 20000mg / L and a temperature of 120°C is 88.3%.

Embodiment 3

[0038] Place a four-neck flask equipped with a stirrer, a thermometer, a constant pressure funnel and a vent tube in a constant temperature water bath, add 3.5 g of N-acryloylmorpholine (ACMO), 40 g of acrylamide (AM), methacryloylpropyl Trimethylammonium chloride (MAPTAC) 3.0g, N-vinylpyrrolidone (NVP) 3.5g, deionized water 200g, stir to dissolve completely, nitrogen gas 30mim, heat up to 40°C, then slowly add 0.01g Composite initiator (m KPS :m VA044 :m DMAPAM =1.5:1:1.5) 10g of aqueous solution, after the dropwise addition, continue to pass nitrogen for 30min, slowly raise the temperature to 50°C, react for 3h and discharge. The colloid is granulated, dried and pulverized to obtain powdery heat-resistant and salt-resistant cationic polyacrylamide. The viscosity-average molecular weight is 15 million, and the cationic content is 6%. The viscosity retention rate aged in brine with a salinity of 40,000mg / L and a temperature of 120°C is 65%.

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Abstract

The invention relates to the technical field of high-molecular compounds, and provides a temperature-resistant and salt-resistant cationic polyacrylamide for an oil field, and a preparation method thereof. The temperature-resistant and salt-resistant cationic polyacrylamide for the oil field is prepared by taking acrylamide, N-acryloylmorpholine, methacryloyl propyl trimethyl ammonium chloride and N-vinyl pyrrolidone as monomers and adopting a composite initiator through aqueous solution polymerization. The polymer has good temperature resistance, salt resistance and adsorption performance, and the viscosity retention rate is larger than or equal to 75% at the salinity of 30000 mg / L and the temperature of 120 DEG C; by adopting the composite initiator, the free radical release rate is stable, the stable free radical concentration in the system is kept, the initiation efficiency is improved, and the formation of a high-molecular-weight product is facilitated; and the preparation process is simple, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of polymer compounds, and relates to a temperature-resistant and salt-resistant cationic polyacrylamide for oil fields and a preparation method thereof. Background technique [0002] With the increasing degree of reservoir exploration, oil and gas exploration areas are gradually shifting from medium and shallow layers to deep and ultra-deep layers. Deep oil and gas resources are an important replacement area for the development of oil and gas resources in the future. Water injection and gas injection are important measures for the development of such deep reservoirs, but long-term water injection or gas injection aggravates the heterogeneity of the reservoir and serious invalid channeling of injected water, which leads to rapid rise of water cut in oil wells and increases the difficulty of profitable oilfield development . [0003] Water plugging and profile control technology is to control the flow directi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/34C08F226/10
CPCC08F220/56C08F220/58C08F220/34C08F226/10
Inventor 逯贵广曾志强杨阳王康黄冬魏开轩王玉
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD