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Thermally stable polymers for enhanced oil recovery

A technology of enhanced oil recovery and polymer, applied in the direction of drilling composition, water pollutants, chemical instruments and methods, etc., can solve the problem of high initial viscosity

Inactive Publication Date: 2021-02-02
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the initial viscosity of such dispersions is usually high enough to prevent their injection into subterranean formations

Method used

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  • Thermally stable polymers for enhanced oil recovery
  • Thermally stable polymers for enhanced oil recovery
  • Thermally stable polymers for enhanced oil recovery

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Experimental program
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Embodiment 1

[0117]Three polymers were synthesized in water at the indicated molar composition ratios using thermally-initiated free-radical polymerization of the indicated monomers. Polymer 1 is a 35 / 37 / 27 poly(acrylamide / sodium acrylate / DADMAC) terpolymer. Polymer 1 was diluted to 3000 ppm (0.3% by weight) with fresh water or synthetic seawater after synthesis. After dilution, the bulk viscosity of the dispersion was measured to provide a baseline measurement (aged 0 days at 120°C). After the viscosity was measured, the dispersion was deoxygenated, then the deoxygenated dispersion was sealed and stored in an oven set at 120°C. Aliquots were removed periodically to test the viscosity of the dispersion. Use Anton PaarMCR 302 rheometer (available from Anton Paar GmbH, Graz, Austria) or Brookfield DV2T viscometer (available from Brookfield Engineering Laboratories, Inc) at 39.6s -1 The viscosity of all polymer dispersions was measured at a shear rate of . All viscosities are measured at ...

Embodiment 2

[0124] Polymer 5 was synthesized in water at the indicated molar composition ratios using thermally-initiated free-radical polymerization of the indicated monomers. Polymer 5 is a poly(acrylamide / sodium acrylate / DADMAC) terpolymer in a molar ratio of 34 / 34 / 32. Polymer 6 is a poly(acrylamide / NVP / AMS) terpolymer having a molar ratio of 50 to 65 acrylamide, 15 to 25 NVP, and 20 to 25 AMS. Polymer 4, Polymer 5, and Polymer 6 were each dispersed at 0.75 wt% (7500 ppm) solids in 3.5 wt% synthetic seawater for evaluation.

[0125] The viscosities of the three dispersions were measured using an Anton Paar MCR 302 rheometer (available from Anton Paar GmbH, Graz, Austria). For all measurements, the shear rate is 7s -1 . The initial viscosities of the three dispersions were measured at 25°C and 85°C, after which the dispersions were deoxygenated and stored in an oven set at 120°C for 15 days. Aliquots were taken periodically for Brookfield viscosity measurements at 25°C and 85°C. Th...

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Abstract

Polymer compositions useful in high temperature enhanced oil recovery applications are disclosed herein. The polymer composition comprises at least 20 mole percent N,N-dialkyl-N,N-diallylammonium salt and also has a net negative charge. The polymer composition provides a polymer dispersion in water or brine having a stable viscosity when maintained at a temperature of 100°C and above for at least 2 days.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Application Serial No. 14 / 594,706, filed January 12, 2015, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to polymer compositions for use in high temperature enhanced oil recovery applications. The polymer composition provides a dispersion in water or brine with a stable viscosity when maintained at a temperature of 100°C and above for at least 2 days. Background technique [0004] Crude oil development and production in US oil reservoirs can include up to three distinct phases: primary recovery, secondary recovery, and tertiary (or enhanced) recovery. During primary recovery, the natural pressure or gravity of the reservoir drives the oil into the wellbore, combined with artificial lift techniques (such as pumps) that bring the oil to the surface. But typically only about 10% of the original oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F101/32C08F220/00C08F220/34C08F220/60C08F220/56
CPCC08F26/04C09K8/588C08F226/04C08F220/56C08F220/06
Inventor 彼得·E·里德威廉姆·J·安德鲁斯阿希什·达万
Owner ECOLAB USA INC