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By P. Skalle

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42 Pressure Control During Oil Well Drilling Well Control Equipment 2. Stop pump, check for flow. Is it a real kick or a false alarm? 3. First priority-closing elements: a) Close upper annulus first (the preventer can close around TJ. Do not need to know TJ’s position at this initial stage). g. by the mud pump) . c) Open inner and outer fail safe valve (if not already open, in accordance with alternative procedure) and slowly close adjustable choke in choke manifold. d) Observe MAASP. 4. Close the remaining valves in the BOP and hang off the drill string by letting it rest on a tool joint in the BOP a) Find position of the TJ closest to the pipe preventer to be closed.

5 Composition of influxing pore fluid It is always of importance to check what type of fluid that has entered the well. If only liquid (oil, water or mud) has entered the well, the displacement procedure is simplified and will, by far, not be so critical as for a gas kick. However the killing procedure will still be the same 51 Pressure Control During Oil Well Drilling Standard killing methods Volume gained in the pit, Vkick, represents the quantity of the formation fluid entering the well bore.

Note the mud volume pumped and the stabilized pressure. See the red dots in Figure 2-18. • Continue the procedure until the stabilized pump pressure deviates from the pressure trend line. This point is called the leak off pressure, pLO. Mud pit and pump Leak off pressure Drill string inside riser Closed BOP Hydrostatic mud pressure Mud pressure during LOT Depth Last casing Fracture pressure at casing shoe Pressure Drilled 3 m below casing shoe Figure 2-17: Well configuration and final pressure during a LOT.

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