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- W2014827720 abstract "Abstract A new strategy of using pH sensitive polymers for conformance control is proposed. The rheological properties of some polymers such as anionic derivatives of polyacrylic acid are shown to be very pH sensitive. For example, their viscosity varies from 5 cp at a pH of 2.5 to 20,000 cp at a pH above 6.0. This rheological behavior is reversible as the pH is cycled. Rheological data is presented at different polymer concentrations, temperatures and in solutions with different ionic strength. The effect of temperature on the rheological properties of the polymer is shown to be small. Compatibility tests showed that this polymer is compatible with most brines (NaCl, NH4Cl, and KCl). Core flow experiments were conducted on Berea cores. The results showed that the polymer solution was easily propagated through 6 inch long cores due to its low initial viscosity (~5cp). The polymer solution formed a rigid gel inside the pores after a shut-in period of 24 hours as the pH of the fluid increased above 6. The gelled polymer was found to be stable up to the maximum examined pressure gradients of 4000 psi /ft across the core. Experiments were conducted by using acid pre-flushes ahead of the polymer solution. These results indicate that the polymer can be placed deep into a formation by using pre-flushes designed for a specific rock mineralogy. The pH sensitive polymers studied here are excellent candidates for conformance control. It may also be possible to use them for temporary zonal isolation since they can be easily broken down with a mild acid wash and flowback." @default.
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- W2014827720 date "2002-02-20" @default.
- W2014827720 modified "2023-10-06" @default.
- W2014827720 title "Use of a pH Sensitive Polymer for Conformance Control" @default.
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- W2014827720 doi "https://doi.org/10.2118/73782-ms" @default.
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