Drill-in fluid reduces formation damage, increases production rates
- Nederlandse Aardolie Maatschappij B.V., Velsen (Netherlands)
- Ensco International/NAM, Assen (Netherlands)
- M-I LLC, Houston, TX (United States)
- M-I LLC, Velsen (Netherlands)
A sodium formate drill-in fluid system reduced formation damage, resulting in better-than-expected production rates for an off-shore Dutch development well. Programmed to optimize production capacity and reservoir drainage from a Rotliegend sandstone gas discovery, the 5-7/8-in. subhorizontal production interval was drilled and completed barefoot with a unique, rheologically engineered sodium formate drill-in fluid system. The new system, consisting of a sodium formate (NaCOOH) brine as the base fluid and properly sized calcium carbonate as the formation-bridging agent, was selected on the basis of its well-documented record in reducing solids impairment and formation damage in similar sandstone structures in Germany. The system was engineered around the low-shear-rate viscosity (LSRV) concept, designed to provide exceptional rheological properties. After describing the drilling program, the paper gives results on the drilling and completion.
- OSTI ID:
- 634591
- Journal Information:
- Oil and Gas Journal, Vol. 96, Issue 28; Other Information: PBD: 13 Jul 1998
- Country of Publication:
- United States
- Language:
- English
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