The paper discusses the laboratory evaluation and field application of an unconventional drilling fluid system for drilling horizontally in an unconsolidated shallow gas sand. Laboratory work has suggested a mechanistic model which is consistent with field observations. Detailed formulation work addressed anticipated concerns identified for the project. Two case histories are described. Fluid formulations and operational performance are described in detail.

Keywords:
slurry, application, requirement, drilling fluid chemistry, operation, caustic soda, drilling fluid selection and formulation, mmh fluid, horizontal well, displacement
Subjects:
Drilling Operations, Drilling Fluids and Materials, Well & Reservoir Surveillance and Monitoring, Formation Evaluation & Management, Directional drilling, Drilling fluid selection and formulation (chemistry, properties), Drilling fluid management & disposal
Copyright 1991, Society of Petroleum Engineers
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