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• W4233880427 abstract "Assessment of the Fate and Ecological Risk of Synthetic Paraffin Based Drilling Mud Discharges Offshore Sarawak and Sabah (Malaysia) Philip B. Dorn; Philip B. Dorn Shell Health Services Search for other works by this author on: This Site Google Scholar Ileana Rhodes; Ileana Rhodes Shell Global Solutions Search for other works by this author on: This Site Google Scholar Diana C.L. Wong; Diana C.L. Wong Shell Health Services Search for other works by this author on: This Site Google Scholar Remi Van Compernolle; Remi Van Compernolle Shell Global Solutions (US), Inc. Search for other works by this author on: This Site Google Scholar Emiliano Hinojosa; Emiliano Hinojosa Shell Global Solutions (US), Inc. Search for other works by this author on: This Site Google Scholar Walter F. Farmayan; Walter F. Farmayan Shell Global Solutions Search for other works by this author on: This Site Google Scholar James P. Ray; James P. Ray Oceanic Environmental Solutions Search for other works by this author on: This Site Google Scholar Bela James; Bela James Oceanic Environmental Solutions, LLC Search for other works by this author on: This Site Google Scholar Sajali Hj-Kip; Sajali Hj-Kip Sarawak Shell Berhad Search for other works by this author on: This Site Google Scholar King-Kai Hii King-Kai Hii Sarawak Shell Berhad Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Asia Pacific Health, Safety, and Security Environment Conference and Exhibition, Bangkok, Thailand, September 2007. Paper Number: SPE-108653-MS https://doi.org/10.2118/108653-MS Published: September 10 2007 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Dorn, Philip B., Rhodes, Ileana, Wong, Diana C.L., Van Compernolle, Remi, Hinojosa, Emiliano, Farmayan, Walter F., Ray, James P., James, Bela, Hj-Kip, Sajali, and King-Kai Hii. Assessment of the Fate and Ecological Risk of Synthetic Paraffin Based Drilling Mud Discharges Offshore Sarawak and Sabah (Malaysia). Paper presented at the SPE Asia Pacific Health, Safety, and Security Environment Conference and Exhibition, Bangkok, Thailand, September 2007. doi: https://doi.org/10.2118/108653-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Asia Pacific Health, Safety, Security, Environment and Social Responsibility Symposium Search Advanced Search AbstractThe environmental fate and effects of four paraffin and one olefin synthetic based drilling mud (SBM) cuttings discharge offshore Sarawak/Sabah Malaysia were compared approximately 3 and 15 months post discharge. Shallow and deepwater sites were assessed for physical, chemical and biological properties to determine whether paraffin based drilling mud cuttings discharge effects were comparable to olefin based cuttings discharge, and would potentially be acceptable for the discharge of Gas-to-Liquid (GTL) paraffin based cuttings. Prospective ecological risk assessment at each site was used to predict projected depositional area concentrations and toxicity of discharges. Those data were used to select field collection sites. Average retention on cuttings (ROC) for all five sites was 5.3 % (4.2–8.3%). The SBM, measured as Total Extractable Hydrocarbon (TEH) concentrations, were correlated to distance from discharge and were typically near analytical detection beyond near field stations (60 to 400 m) from discharge. Detectable TEH concentrations were predominantly found in 0–4 cm depth of the sediment samples collected from all sites. Both paraffin and olefin cuttings were degraded three months after discharge and continued to show increased degradation 15 months post discharge. Composition of the paraffin SBM changed over time with a loss of n-alkanes and some isoparaffins indicating that paraffin degradation was occurring in the field. Sediment toxicity conducted on several samples from two sites indicated toxicity at sites with high TEH. Pisagan samples containing n-alkanes showed toxicity whereas samples that showed no toxicity did not have n-alkanes that have largely degraded. A modeling study determined that with existing bottom oxygen concentration ~2 mg/L, estimated currents at 5–10 cm/s, and aerobic sediments having positive (+) oxidizing reduction potential within 2 cm of surface, aerobic degradation was possible for paraffin (and olefins) and could explain degradation of the paraffin. Both modeling and actual field sampling verified a thin cuttings deposition layer that allowed oxic degradation to occur. Redox correlated with TEH and redox was significantly affected by distance at some sites. Benthic macroinvertebrate surveys limited to two deepwater sites indicated no differences between reference sites having below detection TEH and those sites within the zone of cuttings discharge, although differences were observed between these two sites. Benthic community parameters do not appear to be related to discharged SBM cuttings as measured by TEH concentrations. Degradation of paraffin over time and decreasing concentrations, aerobic surface sediment conditions, and no apparent differences in benthic communities confirm that paraffin SBM cuttings are having minimal environmental impact as presently used in offshore Malaysian coastal environments.IntroductionThe exploration and production of mineral resources is contingent in part on acceptable environmental performance and leaving a minimal and short-lived footprint in the environment after activities have been completed. Part of an environmental assessment for this activity would include determining ecological risk of drill cuttings discharge. In recent years, the use of synthetic-based drilling mud (SBM) has been approved in many regions based upon their favorable environmental performance in comparison to diesel which was banned, and requirements in the North Sea for 10% mineral oil on cuttings further reduced in 1997 to a 1% threshold after January 19971–8. This action resulted in development of synthetic based drilling fluids used in drilling muds (SBM), which were more environmentally acceptable and exhibited favorable drilling properties. In particular, SBM was first used in the US Gulf of Mexico (GOM) contingent on meeting requirements for anaerobic biodegradability, toxicity, and PAH content 9. Keywords: wax remediation, flow assurance, paraffin remediation, Modeling & Simulation, Hydrate Remediation, Production Chemistry, hydrate inhibition, scale remediation, oilfield chemistry, drilling fluid chemistry Subjects: Drilling Fluids and Materials, Drilling fluid selection and formulation (chemistry, properties) This content is only available via PDF. 2007. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4233880427 title "Assessment of the Fate and Ecological Risk of Synthetic-Paraffin-Based Drilling-Mud Discharges Offshore Sarawak and Sabah (Malaysia)" @default.
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