A successful Barites plug should accomplish: killing of the well plugging of lost circulation zone. Application Barite plugs shall be applied when the following situations arise: Simultaneous kicking and lost circulation. Abandonment procedure to allow safe withdrawal of drillpipe to permit subsequent setting of a cement plug. Withdrawal of drillpipe to either set casing or … Drilling Fluids Losses: Barites Plugs

Flow chart for losses induced during running in:  

Losses while drilling dynamic or static:  

If conventional LCM pills prove ineffective, a gunk squeeze may be attempted. The method utilises the swelling property of Bentonite in the presence of water. This method is not to be used for losses in reservoir section.  Allow four hours for the plug to set. The Bentonite will hydrate after the base oil is squeezed … Drilling Fluids Loses – Gunk Squeeze

If lost circulation is expected, the following recommendations should be followed: Nozzles of minimum 18/32in shall be used. As a rule-of-thumb, bit nozzles must be three times larger than the largest particle size of LCM, in order to reduce the possibility of blocking. If smaller nozzles are necessary a circulating sub shall be incorporated into … Drilling Fluids losses – LCM in Non Reservoir Section

If losses occur in reservoir sections, the following options are available: As a first step, the mud gradient shall be reduced, formation pressures permitting. If the gradient reduction provides no benefit, then use CaCo3 LCM material as follows: Formulation and Mixing Procedure for LCM Pills Calcium Carbonate shall be applied according to the details in … Drilling Fluids Losses: LCM in Reservoir Section