Improvements to hydrophobically modified water-soluble polymer technology to extend the range of oilfield applications
Proceedings - SPE International Symposium on Oilfield Chemistry, ISSN: 1046-1779, Vol: 1, Page: 158-169
2011
- 7Citations
- 12Captures
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Conference Paper Description
Hydrophobically modified water-soluble polymers have unique associative and adsorption properties that make them attractive for oilfield use. Previous publications have outlined the use or potential use of these materials for water reduction in producing wells, fluid diversion, leakoff control, brine viscosification, stimulation treatments (fracturing and acidizing), and enhanced oil recovery (EOR) applications. The commercial success of a hydrophobically modified polymer based on a C16 modified acrylate in such applications has been well documented. A brief summary of case histories for each of these operations is presented. While this class of polymer has shown a wide variety of commercial uses to date, its full potential remains unrealized because of its low critical solution temperature (LCST) (<160°F). This is the temperature at which the polymer precipitates, especially in high-pH fluids, such as those used in borate-crosslinked fracturing gels. The LCST values vary inversely with the pH of the fluid containing the polymer. While this temperature-limitation problem can be partially mitigated by using pH-control agents, it was desired to develop systems that do not suffer from this limitation and allow for extension of the use of such polymers in a variety of wellbore-treatment fluids and well conditions. This paper describes laboratory results from a two-pronged approach to overcome this limitation - (1) synthesis of alternate polymers that would retain the performance characteristics of the original polymer without its limitations and (2) chemical alteration of the formulations containing the original polymer to eliminate the LCST/pH limitation. Laboratory-testing data will include LCST dependence on pH for different polymers, fluid compositions, as well as core-flow comparisons. Ultimately, a simple yet effective chemical solution that not only maintains the performance of the original polymer but also potentially expands the area of usefulness was found. Copyright 2011. Society of Petroleum Engineers.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=79960275027&origin=inward; http://dx.doi.org/10.2118/140845-ms; https://onepetro.org/SPEOCC/proceedings/11OCS/11OCS/SPE-140845-MS/150540; http://www.onepetro.org/doi/10.2118/140845-MS; http://www.onepetro.org/google/Papers/SPE/eLibrary_Papers/spe/2011/11OCS/SPE-140845-MS/SPE-140845-MS-P.pdf?id=SPE-140845-MS&soc=SPE
Society of Petroleum Engineers (SPE)
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