Causes Blowout.docx

Causes Controlling the subsurface pressure is one of the importances in the drilling operations. Improper well control procedures will lead to uncontrolled flow of hydrocarbons to the surface which is known as blowout that had happened in Krishna-Godavari (KG) Basin, East Coast of India. The sedimentation rate in the deltas of KG basin is high, so the water initially present in the pore space cannot escape out and result in overpressured formations. The formation pressure at the basin is two times larger than the normal hydrostatic pressure. So, improper procedures can easily cause blowout at these formations as the hydrostatic pressure cannot withstand the formation pressure. The basin also contains a lot of gas resources. Drilling too fast in the gas reservoirs may cause blowout because the gas contained in the formation being drilled can mix with the drilling mud resulted from underbalance pressure. This cause the drilling mud to become gas cut and lightened to the surface.