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Low-molecular-weight polymer with functionally modified ends and preparation method thereof

A low-molecular-weight, polymer-based technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high polymer solution injection pressure, increased dissolution time, economic cost, and small space

Active Publication Date: 2019-10-22
青岛长兴高新科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional polymer oil displacement agent partially hydrolyzed polyacrylamide (HPAM) has the problem of poor temperature and salt resistance and shear resistance, so amphiphilic polymers containing hydrophobic groups have been developed
[0004] However, existing polymer systems, while improving in performance, are not fully suitable for offshore oilfields
Polymers Difficult to Meet Rapid Dissolution Demands of Offshore Platforms
The space of the offshore platform is small, it is difficult to improve the polymer dissolution effect by increasing the aging tank or prolonging the aging time. The injection pressure of the polymer solution is too high or even blocks the formation
In addition, the offshore platform has a large well spacing, and the polymer is easily sheared and degraded during the migration process, resulting in viscosity loss. In order to achieve the target viscosity, the amount or molecular weight of the polymer needs to be increased, which undoubtedly increases the dissolution time and corresponding economic costs.
[0005] The high molecular weight of the polymer is the main reason for its low dissolution rate. For the polymer formed by covalent linkage, it is difficult to completely solve the above key problems by simply reducing the molecular weight.
The difficulties are mainly reflected in: First, the molecular weight distribution of polymers obtained by conventional polymerization methods such as free radical polymerization is wide, and it is difficult to achieve effective regulation of molecular weight
Second, while lowering the molecular weight increases polymer solubility, it also reduces the polymer's hydrodynamic radius, thereby reducing its viscosity-enhancing ability

Method used

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  • Low-molecular-weight polymer with functionally modified ends and preparation method thereof
  • Low-molecular-weight polymer with functionally modified ends and preparation method thereof
  • Low-molecular-weight polymer with functionally modified ends and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Accurately weigh a certain amount of acrylamide monomer and RAFT chain transfer agent and dissolve in a certain amount of deionized water, the mass concentration of acrylamide monomer is 25%, the mass concentration of RAFT chain transfer agent is 0.05%, and then placed in 250mL In a three-necked flask, stir continuously to dissolve it. The three-neck flask was placed in a constant temperature water bath, and N 2 And stirred for 0.5 hours until the solution was clear. The initiator is azobisisobutyronitrile (AIBN) injected with a syringe, and the amount of the initiator is 0.05% of the total mass of the monomers. The temperature was raised to 40°C, and the N 2 Stir continuously, seal the three-necked flask and place it for 6 hours, and finally get a transparent gel-like product, take it out and cut it into small pieces, purify it with ethanol precipitation three times, vacuum-dry and granulate the low-molecular-weight polymer product, and the calculated yield is about ...

Embodiment 2

[0062] Accurately take a certain amount of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and RAFT chain transfer agent and dissolve it in a certain amount of deionized water, the mass concentration of monomer is 30%, the mass of RAFT chain transfer agent The concentration is 0.1%, and then placed in a 250mL three-neck flask, stirring constantly to dissolve it. The three-neck flask was placed in a constant temperature water bath, and N 2 And stirred for 0.5 hours until the solution was clear. The initiator is azobisisobutyronitrile (AIBN) injected with a syringe, and the amount of the initiator is 0.1% of the total mass of the monomers. The temperature was raised to 45°C, and the N 2 Stir continuously, place the three-neck flask sealed for 6 hours, and finally obtain a transparent gel-like product, which is taken out and cut into small pieces, purified by ethanol precipitation three times, vacuum-dried, and granulated low-molecular-weight polymer product. A polymer repres...

Embodiment 3

[0064] Accurately weigh a certain amount of betaine type monomer (formula II), acrylamide, quaternary ammonium salt type long carbon chain association monomer (formula III, n 2 11,) and RAFT chain transfer agent are dissolved in a certain amount of deionized water, the mass concentration of the monomer is 20%, and the mass concentration of RAFT chain transfer agent is 0.15%, then placed in a 250mL three-necked flask, constantly stirred to make it dissolve. The three-neck flask was placed in a constant temperature water bath, and N 2 And stirred for 0.5 hours until the solution was clear. The initiator is azobisisobutyronitrile (AIBN) injected with a syringe, and the amount of the initiator is 0.05% of the total mass of the monomers. The temperature was raised to 35°C, and the N 2 Stir continuously, place the three-neck flask sealed for 5.5 hours, and finally obtain a transparent gel-like product, which is taken out and cut into small pieces, purified by ethanol precipitatio...

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Abstract

The invention relates to a low-molecular-weight polymer with functionally modified ends and a preparation method thereof. The preparation method comprises a step of subjecting a low-molecular-weight polymerization monomer and a RAFT chain transferring agent to a copolymerization reaction in the presence of an initiator through radical polymerization so as to obtain the low-molecular-weight polymerwith functionally modified ends, wherein the low-molecular-weight polymerization monomer is one or more selected from the group consisting of a betaine type amphiphilic polymer monomer, an acrylamidemonomer, a quaternary ammonium salt type long-carbon-chain association monomer and 2-acrylamide-2-methylpropanesulfonic acid; and two ends of the formed polymer are function groups as described in the specification, and in the function groups, m is in a range of 1-3 and n is in a range of 2-4, so the ends of the polymerization monomers can be connected with each other through the non-covalent interaction, i.e., host-guest clathration. The molecular weight of the polymer is controlled below 1 million Da, and the underground rapid recovery and thickening of a solution after shearing are realized.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a low-molecular-weight polymer with terminal function modification and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Reservoirs in my country have strong heterogeneity, low recovery factor, and great chemical flooding potential. As the main body of domestic waterflood development oilfields enters the "double high" development stage with high water cut and high recovery degree, polymer flooding, as an important chemical flooding enhanced oil recovery technology, has been industrialized and developed rapidly in my ...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F120/58C08F220/60C08F220/56C08F220/34C08F2/38C09K8/588
CPCC08F120/56C08F120/58C08F220/60C08F2/38C09K8/588C08F2438/03C08F220/606
Inventor 张德文康万利杨红斌王鹏祥李欣欣赵晗张向峰
Owner 青岛长兴高新科技发展有限公司
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