Effective Bridging Agent Particle Sizes of Reservoir Drilling Mud

The optimization of bridging agent size selection in drilling mud is now critically demanding due to the desired pressure to produce the non-damaging fluid or low damaging fluid. Bridging agent is the materials that can give effect on minimizing fluid invasion and optimize the sealing operations. Three different sizes of bridging agents were prepared, Fine (F), Medium (M) and Coarse (C) size where calcium carbonates had been selected as the bridging agents. Water Based Mud had been chosen as based of drilling mud to be investigated. Experiments conducted were rheology and filtration test. The study shows that the mud weight was increase with increasing size of bridging agent. The filtration test showed a high fluid loss in mud samples without bridging agent (Mud A) and least fluid loss in Mud B. Thus, the fine size of bridging agent can form better filter cake and prevent the fluid being loss too much thus reducing the damage to the reservoir wellbore.