Reservoir sections can be drilled with a low colloidal content sodium chloride/polymer mud system weighted with calcium carbonate. The recommended formulation is to minimise formation in a sandstone reservoir. Product Functions CACO3 Acid soluble weighting agent. SODIUM CHLORIDE To improve shale inhibition. IDVIS A pure grade xanthan gum, for providing yield point and progressive gel … NaCl Polymer CaCO3 Mud
Surface sections can be drilled with a gypsum/polymer water based mud. Attention must be paid to preserving the inhibitive properties of the drilling fluid by maintaining appropriate polymer and gypsum concentrations in the mud. Particular attention must be given to solids control by optimising the operation of the solids control equipment in order to minimise … Gypsum/ Polymer Mud
Generally, barytes sag is linked to a rapid change in mud properties, for operational reasons: Increase mw because of kick, reduce mw because of diff sticking pb, thinning mud at TD for the cement job, etc. – POBM systems are usually very thin and often run at low gels 5/20 and low “low end” rheology. … Barytes sag – treatment, prevention and causes
Mud density will decrease with increasing temperature, and increase with increasing pressure. Theoretical models similar to those mentioned in SPE Paper 11118 predict that temperature is the major effect. In an attempt to validate the model, the density of a sample of field mud was measured downhole temperatures and pressures. While drilling with 977pptf IOEM, … Downhole Density Measurements