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Linear salt-resistant polymer for oil displacement and preparation method thereof

A polymer, linear technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems affecting the quality and efficiency of polymer development, difficult water solubility and salt resistance, and reduced water solubility of polymers. , to achieve the effect of simple and feasible preparation method, improved salt resistance, and improved salt resistance

Active Publication Date: 2020-02-11
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the viscosity of polymer solution diluted with sewage, it is necessary to increase the amount of polymer dry powder by 40% to 65%, which seriously affects the quality and benefit of polymer flooding development.
[0004] On the other hand, in the study of the salt resistance performance of such polymers, the introduction of rigid monomers often brings the negative effect of reducing the water solubility of the polymer, so it is difficult to improve the water solubility and salt resistance performance at the same time, or at least improve the resistance. Salt properties while maintaining water-soluble polymers

Method used

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  • Linear salt-resistant polymer for oil displacement and preparation method thereof
  • Linear salt-resistant polymer for oil displacement and preparation method thereof
  • Linear salt-resistant polymer for oil displacement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] This example provides a preparation method of a salt-resistant polymer for oil displacement and the structural characterization of the polymer.

[0068] In this embodiment, the polymer structure characterization instrument is a superconducting pulse Fourier transform nuclear magnetic resonance spectrometer, produced by Bruker Corporation of the United States.

[0069] In this example, the mass percentages of the four monomers in the reaction solution are: acrylamide (AM), 20%, acrylic acid (AA), 2.5%, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) , 3.75%, sodium acryloyl-4-methylpiperazine propanesulfonate (SHMP), 0.25%.

[0070] In this embodiment, the oxidation initiator is potassium persulfate (K 2 S 2 o 8 ); the reducing initiator is sodium bisulfite (NaHSO 3 ); the azo initiator is azodiisopropylimidazoline hydrochloride (VA-044).

[0071] In the present embodiment, the synthetic formulation of the salt-resistant polymer for oil displacement is as follows (...

Embodiment 2

[0101] This example provides a preparation method of a salt-resistant polymer for oil displacement and a study on its salt-resistant performance.

[0102] In this example, the salt resistance performance of the polymer is characterized by the viscosity retention rate. Under the same salinity condition, the higher the viscosity retention rate of the polymer solution, the better its salt resistance.

[0103] In the present embodiment, the salt resistance performance test process of polymer is as follows:

[0104] (1) Use simulated sewage (0.095%wt NaCl solution) to configure 500g of polymer mother liquor with a concentration of 0.5%wt.

[0105] (2) Utilize simulated sewage (2%wt NaCl solution) to dilute the polymer mother liquor into 50g, the solution of concentration 0.1%wt, the salinity of the diluted solution is respectively 0.095%wt, 0.241%, 0.4%wt, 0.7 %wt, 1%wt (NaCl concentration).

[0106] (3) Using a Brookfield viscometer (DV-2+Pro Viscometer, produced by Brookfield), ...

Embodiment 3

[0130] This example provides a preparation method of a salt-resistant polymer for oil displacement and a study on its injection performance.

[0131] In this embodiment, the injection performance of the salt-resistant polymer is characterized by a core flow experiment, and the assessment index is the lower limit of the permeability of the polymer solution that can be injected into the core under the same concentration and salinity conditions. The lower limit of the polymer solution's injectable core permeability is defined when the residual resistance coefficient of the subsequent water flooding exceeds 2 / 3 of the resistance coefficient of the polymer flooding process.

[0132] In this example, the instrument used in the flow experiment is a QY-C21 automatic core displacement device, manufactured by Jiangsu Huaan Petroleum.

[0133] In this embodiment, the determination process of the lower limit of the injectable permeability of the polymer flow experiment is as follows:

[...

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Abstract

The invention relates to a linear salt-resistant polymer for oil displacement and a preparation method thereof. The molecular weight of the salt-resistant polymer is between 12 million and 25 million,and the salt-resistant polymer is prepared from acrylamide (AM), acrylic acid (AA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), sodium acryloyl-(4-methylpiperazinyl)propane sulfonate (SHMP) andsulfonated styrene (SSS) monomers as main synthetic raw materials by adding a composite initiation system and a cosolvent through solution polymerization. The polymer synthesized by the invention hasbetter salt resistance, injection performance and water solubility. Under the condition of oilfield sewage, the salt-resistant polymer can improve the recovery ratio of polymer flooding to a higher extent, and simultaneously realize the synchronous improvement of water solubility, salt resistance and molecular weight.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery in oil field development, in particular to a linear salt-resistant polymer for oil displacement and a preparation method thereof. Background technique [0002] Polymer flooding technology can effectively enhance the recovery of crude oil and play an increasingly important role in maintaining crude oil production. With the continuous expansion of the development scale of polymer flooding, the recovery of oily sewage has risen sharply. Under the condition that the produced sewage cannot be discharged outside, using sewage to dilute the polymer mother liquor has become the main means of sewage recycling. [0003] At present, the polymer used for oil displacement is mainly partially hydrolyzed polyacrylamide. When diluting the partially hydrolyzed polyacrylamide mother liquor with the sewage produced in the oil field, the components of the produced sewage are extremely complex and the ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F220/60C08F212/14C08F4/40C09K8/588
CPCC08F4/40C08F220/56C09K8/588
Inventor 孙龙德王凤兰伍晓林韩培慧孙刚陈国李勃潘峰刘宏生
Owner PETROCHINA CO LTD
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