Harms of excessive fluid loss to drilling operation

Rock cuttings, the major harmful solids in mud, can exert great influence on the mud properties as they add to the density, viscosity, yield point, water loss, abrasiveness, treacliness and flow resistance, and can trigger various bore hole complications like damage of formations, reduction of drilling velocity, increase of table torque, resistance of each trip, sticking drilling, leakage, blowout, etc.

Pressure gradients naturally genders fluid loss through the walls from the drilling mud as drilling processes, subsequently developing into borehole collapse and drilling-related accidents. Thus, filtrate reducer plays a significant role in maintaining relatively low fluid loss, one of the essential properties of the mud.

Pressure gradients naturally genders fluids loss through the walls from the drilling mud as drilling processes. Excessive fluid loss can impact many aspects of drilling operations:

1. Shale formation can expand and collapse and the wall be less stabilized.
2. Fluid penetration can expand the clay, blocking the oil and gas channel and damaging the formation.
3. Larger fluid loss thickens the filter cake, narrows the borehole diameter, increases the torque of drilling rig, hinders “going in”, weakens cementing quality, etc.

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