Donald P. Sparling Oryx Energy Co. Oklahoma City Don Williamson International Drilling Fluids Inc. Houston A mixed metal hydroxide (MMH) mud reduced some of the hole problems common to offset wells in the Arkoma basin. By specially engineering the MMH rheology, cuttings removal efficiency increased, and well bore problems were minimized. Wells drilled in the Arkoma basin frequently have experienced problems associated with hole instability: excessive reaming, stuck pipe, packing off, and difficulty in obtaining open hole logs. These problems often occur in the massive shale intervals of Atokan age. ...

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