... the discharge limits of spent muds and drilled cuttings. Operators are challenged with achieving a balance between minimizing the potential environmental impact of the drilling fluid against drilling objectives. The inherent advantages provided by emulsion muds are increasingly being offset by environmental...

...IADC/SPE IADC/SPE 19957 Material Balance Concepts Aid in Solids Control and Mud System Evaluation H.L. Dearing, Chevron Services Co. SPE Member Copyright 1990, IADC/SPE Drilling Conference. This paper was prepared for presentation at the 1990 IADC/SPE Drilling Conference held in Houston, Texas...

... a balance in the design of water activities of the mud and shale in order to achieve wellbore stability. The focus of this research therefore is to design balanced activity drilling mud with the shales from Niger Delta that will prevent wellbore instability. Experimental results for four shale samples...

... of a was designed are discussed and fluid, with the conventional mud analyzed in this paper. balance being the present recog- nized petroleum industry stan- References and illustrations at end dard 2 The standard mud balance of paper. consists of a base and graduated arm with cup, lid, knife edge-type pivot point...

... movement occurs in most cases when the unload ratio of mud balance pressure to in-situ effective stress is less than 0.1. This suggests that the hole has been sufficiently unloaded during drilling so that plastic deformation occurs which is not fully recoverable when reloaded during packer inflation...

... mud was used and measured by the system. The system was controlled remotely via WiFi connection. During the test period, manual viscosity and density measurements were also taken using the Fann-35 and mud balance methods. Subsequent comparison shows excellent agreement between the automated and manual...