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Preparation method of dicationic salt-tolerant polymer and application of dicationic salt-tolerant polymer in fracturing fluid

A double cation and polymer technology, applied in the field of oilfield chemical additives, can solve the problem of poor salt resistance of fracturing fluid, and achieve good viscoelasticity and good salt resistance

Inactive Publication Date: 2022-03-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing a dicationic salt-tolerant polymer aiming at the disadvantages of existing hydrophobic association polymer fracturing fluid such as poor salt-resistant effect

Method used

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  • Preparation method of dicationic salt-tolerant polymer and application of dicationic salt-tolerant polymer in fracturing fluid
  • Preparation method of dicationic salt-tolerant polymer and application of dicationic salt-tolerant polymer in fracturing fluid
  • Preparation method of dicationic salt-tolerant polymer and application of dicationic salt-tolerant polymer in fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Synthesis of Hydrophobic Monomer YS

[0048] (1) Dissolve dodecyldimethyl tertiary amine in a composite solvent (mixed solution of acetone and ether), and slowly add 1,3-dibromo The mixed solution of propane and composite solvent, when the dropwise addition is completed, transfer to room temperature and continue to react for 6 hours. After the reaction is completed, filter, remove impurities, spin evaporate at low temperature, and vacuum dry to obtain a white product, which is quaternary ammonium Salt JY, the yield was 78.6%;

[0049](2) The reaction of the first step to obtain quaternary ammonium salt JY and taurine reacts with a molar ratio of 1:1.1 to obtain intermediate JS. At first, taurine is dissolved in a three-necked round-bottomed flask with deionized water, and placed side by side Condensate and reflux in an oil bath at 90°C, dissolve the quaternary ammonium salt JY in a composite solvent of ethanol and water (the volume ratio of ethanol to water is 1:1), an...

Embodiment 2

[0052] Synthesis of Hydrophobic Monomer YS

[0053] (1) Dissolve octadecyl dimethyl tertiary amine in a composite solvent (mixed solution of acetone and ether), and slowly add 1,3-dibromo The mixed solution of propane and composite solvent, when the dropwise addition is completed, transfer to room temperature and continue to react for 6 hours. After the reaction is completed, filter, remove impurities, spin evaporate at low temperature, and vacuum dry to obtain a white product, which is quaternary ammonium Salt JY, the yield was 84.8%;

[0054] (2) The first step reaction obtains quaternary ammonium salt JY and taurine reacts with the molar ratio of 1:1.2 to obtain intermediate JS, at first, taurine is dissolved in the three-neck round-bottomed flask with deionized water, and placed side by side Condensate and reflux in an oil bath at 90°C, dissolve the quaternary ammonium salt JY in a composite solvent of ethanol and water (the volume ratio of ethanol to water is 1:1), and s...

Embodiment 3

[0057] Synthesis of Hydrophobic Monomer YS

[0058] (1) Dissolve octadecyl dimethyl tertiary amine in a composite solvent (mixed solution of acetone and ether), and slowly add 1,3-dibromo The mixed solution of propane and composite solvent, when the dropwise addition is completed, transfer to room temperature and continue to react for 6 hours. After the reaction is completed, filter, remove impurities, spin evaporate at low temperature, and vacuum dry to obtain a white product, which is quaternary ammonium Salt JY, the yield is 89.5%;

[0059] (2) The first step is reacted to obtain quaternary ammonium salt JY and taurine to obtain intermediate JS with a mol ratio of 1:1.3. At first, taurine is dissolved in a three-necked round-bottomed flask with deionized water, and placed side by side Condensate and reflux in an oil bath at 90°C, dissolve the quaternary ammonium salt JY in a composite solvent of ethanol and water (the volume ratio of ethanol to water is 1:1), and slowly di...

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Abstract

The invention discloses a preparation method of a dicationic salt-tolerant polymer and application of the dicationic salt-tolerant polymer in fracturing fluid. According to the technical scheme, the preparation method comprises the following steps: (1) firstly, carrying out quaternization reaction on octadecyl dimethyl tertiary amine and 1, 3-dibromopropane to obtain quaternary ammonium salt JY, then, carrying out reaction on the quaternary ammonium salt JY and taurine to obtain an intermediate JS, and finally, carrying out reaction on bromopropylene and the intermediate JS to obtain a hydrophobic monomer YS; and (2) initiating polymerization of the hydrophobic monomer YS, acrylamide, acrylic acid and N, N-dimethyl dodecyl allyl amine for 6 hours under a low-temperature condition by adopting a micelle polymerization method, so as to obtain the dicationic salt-resistant polymer. The polymer can be directly prepared from high-salinity simulated stratum water or deionized water to be used as fracturing fluid, and shows good temperature resistance, viscoelasticity and shear resistance. The preparation method disclosed by the invention has the characteristics of low cost and convenience in preparation, and the prepared product has good salt thickening property and has a good application prospect in development of high-temperature and high-salt oil and gas reservoirs.

Description

technical field [0001] The invention relates to a preparation method of a dicationic salt-tolerant polymer and its application in fracturing fluid, belonging to the field of oilfield chemical additives. [0002] technical background [0003] Fracturing technology is the most widely used oil and gas field stimulation and transformation technology, and plays an important role in improving the production of oil and gas wells. At present, the fracturing fluid system used at home and abroad is water-based fracturing fluid, which consumes a lot of fresh water resources. According to statistics, in the fracturing operation of deep wells and ultra-deep wells, each well needs to consume thousands or even tens of thousands of cubic meters of fresh water resources. solve. [0004] In the early 1990s, foreign countries have proposed high-salinity water-based fracturing fluid systems, which are mainly used in seawater-based fracturing fluid systems and have achieved certain results. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/02C09K8/68C09K8/88C07C303/22C07C309/14C07C209/12C07C211/63
CPCC08F220/56C09K8/68C09K8/882C07C303/22C07C209/12C08F220/06C08F226/02C07C211/63C07C309/14
Inventor 毛金成薛金星张泉杨小江林冲张恒李超汪全航
Owner SOUTHWEST PETROLEUM UNIV