Design and Development of a Novel Process To Treat Drilling-Fluid Slops: A Positive Environmental and Economic Impact
- Rahul Dixit (M-I SWACO) | Arvind D. Patel (M-I SWACO)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2010
- Document Type
- Journal Paper
- 53 - 57
- 2010. Society of Petroleum Engineers
- 4.3.4 Scale, 4.1.2 Separation and Treating, 6.5.2 Water use, produced water discharge and disposal, 1.11 Drilling Fluids and Materials, 4.1.5 Processing Equipment, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.6 Drilling Operations
- demulsifier, ozone, oil-in-water, slop, water
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- 589 since 2007
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Slop mud, created by water contamination of invert drilling fluids during displacement and cleaning activities, has been successfully treated at source to recover the drilling-fluid phase and water phase. This method included treating the slop mud with a biodegradable demulsifier. The recovered drilling fluid can be reconditioned to acceptable properties for reuse or can be sent for disposal. The recovered/separated slop water phase is contaminated with hydrocarbons and cannot be discharged in an offshore environment unless it meets the discharge criteria of < 30 mg/L of oil in water. Thus, it becomes imperative for the operator to treat the water at source, reduce the enormous expenses associated with transportation/disposal, and embark upon a potentially significant environmental issue. This was achieved by development of an on-site treatment process including filtration, ozonation, and phase separation.
A synthetic-based drilling fluid contaminated with water was separated with a biodegradable demulsifier. The addition of the surfactant resulted in phase separation (i.e., separated drilling-fluid and water phases). As tested by the approved International Organization for Standardization (ISO) method, the separated water phase was found to have oil-in-water content of 4,000 mg/L, which is unacceptable for discharge. The separated water then was treated with ozone. The ozone-treated water was allowed to separate in two phases (i.e., clarified water phase and organic rich phase). The oil-in-water content of the clarified ozone-treated water phase was found to be 30 mg/L, thus reducing the oil-in-water content by 99%.
This paper will present the demulsification methodology, chemistry of ozonolysis, and results obtained to meet or exceed the oil-in-water discharge limits of 30 mg/L. The environmental and economic impact of the process will be discussed.
|File Size||564 KB||Number of Pages||5|
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