A 20 bbl influx of 9 lbm/gal salt water enters a 10,000 ft well containing 10 lb

Question

A 20 bbl influx of 9 lbm/gal salt water enters a 10,000 ft well containing 10 lbm/gal mud. The annular capacity is .0775 bbl/ft opposite the drillpipe and .0500 bbl/ft opposite the 600 ft of drill collars. The capacity factor inside the drillpipe is .01776 bbl/ft and the capacity factor inside the drill collars is .008 bbl/ft. The formation pressure is 6000 psia and assume T=140F.

a) Compute the shut in drillpipe and casing pressure that would be observed after the kick entered the well. (ANS: 785 PSIG, 806 PSIG)

b) Compute the surface annular pressure that would be observed when the top of the salt water kick reaches the surface if the mud density is increased to the kill mud density before circulation of the well. (ANS: 208 PSIG)

c) Compute the total pit gain that  would be observed when the top of the kick reaches the surface. (ANS: 20 BBL)

d) compute the surface annular pressure that would be observed if the kick was methane gas instead of brine. (ANS: 1040 PSIG)

Explanation / Answer

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