Synthesis and assessment of a hydrophobically associating heteropolymer in water-based mud
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ORIGINAL PAPER
Synthesis and assessment of a hydrophobically associating heteropolymer in water‑based mud R. D. Nagre1 · P. A. Owusu2 · Alain Pierre Tchameni4 · S. K. Kyei1 · D. Azanu3 Received: 3 May 2020 / Accepted: 24 September 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract Water-soluble polymers can be used as key ingredients of both drilling fluids for virgin fields and polymer-enhanced oil recovery in underperforming reservoirs. The efficacy of hydrophobically associating heteropolymer (HAH-Polymer) as an agent for petroleum resource recovery was examined in this study. The hydrophobically associating heteropolymer (HAH-Polymer) comprising acrylamide, sodium 2-acrylamido-2-methylpropanesulfonate, hydroxyethyl methacrylate and lauryl methacrylate was synthesized in micellar medium by free-radical polymerization. The hydrophobically associating heteropolymer (HAH-Polymer) was characterised by FTIR and 1H NMR spectral analyses. The effects of temperature, pH and shear on the solution behavior of the HAH-Polymer were also examined. Rheological and fluid loss properties of HAHPolymer-incorporated water-based drilling fluids were assessed. The HAH-Polymer improved the thermal stability between 25 and 160 °C of the drilling mud and maintained mud fluid loss of 8.4–8.6 cm3 compared with the polymer-free blank of 43.5–107.0cm3. In a salt-contaminated mud, the heteropolymer enhanced rheological properties and significantly reduced API filtration loss to 7.6–8.8 cm3 after hot aging between 25 and 150 °C. Under high temperature–high pressure filtration testing of muds, the HAH-Polymer demonstrated excellent fluid loss reduction by providing about eightfold fluid loss control (14.7 cm3) compared to the polymer-free blank (113.2 cm3) at 150 °C. Keywords Hydrophobically associating heteropolymer · Water-based mud · Rheological properties · Filtration loss control property
Introduction The global demand for energy is increasing rapidly, because of population and economic growth. This propels the oil and gas industry to explore deeper reservoirs or maximize oil production of underexploited area, which are characterized by elevated pressures, high temperatures and salinity (Amanullah and Yu 2005; Rees and Sharp 2011). Production * Alain Pierre Tchameni [email protected] 1
Department of Chemical Engineering, Kumasi Technical University, P. O. Box 854, Kumasi, Ghana
2
Department of Civil Engineering, Kumasi Technical University, P. O. Box 854, Kumasi, Ghana
3
Department of Laboratory Technology, Kumasi Technical University, P. O. Box 854, Kumasi, Ghana
4
Lost Circulation Control Laboratory, National Engineering Laboratory for Petroleum Drilling Engineering, Yangtze University, Wuhan 430100, China
of hydrocarbons from such unfavorable reservoirs obligates drilling operations using drilling fluids with the necessary functional requirements. The fluids should have stable mud rheology, low fluid loss property, stability under varied temperature and pressure operating condi
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