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CISDOC database

Document ID (ISN)112156
CIS number 11-0835
ISSN - Serial title 1545-9624 - Journal of Occupational and Environmental Hygiene
Year 2009
Convention or series no.
Author(s) Bråtveit M., Steinsvåg K., Lie S.A., Moen B.E.
Title Modeling of oil mist and oil vapor concentration in the shale shaker area on offshore drilling installations
Bibliographic information Nov. 2009, Vol.6, No.11, p.679-686. Illus. 10 ref.
Internet access Modeling_oil_mist.pdf [in English]
Abstract The objective of this study was to develop regression models to predict concentrations of oil mist and oil vapour in the workplace atmosphere in the shale shaker area of offshore drilling installations. Collection of monitoring reports of oil mist and oil vapour in the mud handling areas of offshore drilling installations was done during visits to eight oil companies and five drilling contractors. A questionnaire was sent to the rig owners requesting information about technical design of the shaker area. Linear mixed-effects models were developed using concentration of oil mist or oil vapour measured by stationary sampling as dependent variables, drilling installation as random effect, and potential determinants related to process technical parameters and technical design of the shale shaker area as fixed effects. The dataset comprised stationary measurements of oil mist and oil vapour from the period 1998 to 2004. The arithmetic mean concentrations of oil mist and oil vapour were 3.89 mg/m3 and 39.7 mg/m3, respectively. The air concentration models including significant determinants such as viscosity of base oil, mud temperature, well section, type of rig, localization of shaker, mechanical air supply, air grids in outer wall, air curtain in front of shakers, and season explained 35% and 17% of the total variance in oil vapour and oil mist, respectively. The models will be helpful in planning control measures to reduce the potential for occupational exposure.
Descriptors (primary) oil mist; drilling and boring (rock, earth); exposure evaluation; offshore oil extraction
Descriptors (secondary) determination in air; questionnaire survey; mathematical models; description of technique
Document type D - Periodical articles
Subject(s) Toxic and dangerous substances
Broad subject area(s) Chemical safety
Browse category(ies) Petroleum and natural gas industry
Exposure evaluation