Impairment Control Historically Abrams et al 1/3 –1/7 rule external bridging versus internal cake concentration aspects: 5% solids poor match with pore size and permeability no understanding of spurt loss

Impairment Control New Insights: Sharma et al invasion of particles impact pore structure adequate description of change in pore properties flow back of particles modeled relative perm effects modeled polymers described as solids

Impairment Control Work done so far: extensive coreflush testing for measuring factors controlling filtration process validation of impairment prediction models matching model results with field data development of practical field tool

Particle Sizes in Drilling Fluids Initial Design

PSD of Drilled Solids in Mud At TD after 2 days of drilling

Available Software Op-ti Bridge (through MI via BP) Sharma’s Model DIF design (bridging agent) Acid Wash program