--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------MASCP + Mud Hydrostatic + Influx Hydrostatic = Formation P. H = (MASCP-FP) / ( .!"(M#-I$F%&' m). *is H ill co,rt to it mor, olum, at s*o, annulus. *is s*o, olum, s*ould , s*run y P= C to t*, 0it 1. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2ic tol,ranc, is tol,ranc, is the maximum gas influx volumes (bbl) for a designed kick intensity that can be successfully shut the well in and circulated out without breaking formation pressure at the casing shoe. 2ic int,nsity is int,nsity is the different between the maximum anticipated formation pressure and planned mud weight. S,condly3 l,arn *o to d,t,rmin ic tol,ranc, y folloin4 st,5s ,lo6
1. Determine kick intensity 2. Determine maximum allowable shut in casing pressure (M!"#$) %. Determine influx height with this following e&uation
'. #alculate influx volume at based on the influx height "nflux volume at * bbl + ,ick e ight* ft x nnular #apacity of and ole* bbl-ft . #alculate influx volume at shoe base on the influx height "nflux volume at shoe* bbl + ,ick eight* ft x nnular #apacity of D$ and ole* bbl-ft
/. #alculate influx volume at the bo ttom based on the influx volume at the shoe by applying oyle0s aw "nflux volume at bottom* bbl + ("nflux volume at shoe x eak off test pressure at shoe) (3ormation pressure* psi) 3ormation pressure can be calculated from well 45D and maximum anticipated formation pressure. 6. #ompare both figures. 4he smaller figure is the ,ick 4olerance. For mor, und,rstandin43 5l,as, d,t,rmin, ic tol,ranc, it* folloin4 data7 $ossible maximum formation pressure + 12. ppg $lanned 4D mud weight + 12.7 ppg #asing shoe + /*770MD-*770 45D eak off test at casing shoe + 1'.6 ppg ole depth + 17*1770MD-8*77045D it + 1291-': + ;7 ft verage 12.7 + 7. ppg ". Maximum Alloal, S*ut In Casin4 Pr,ssur, (MASICP) ?? some people may call maximum allowable initial shut in casing pressure??. + (1'.6 > 12.7) x 7.72 x *77 + 662 psi
9. Influx *,i4*t6 :. Calculat, influx olum, at 0HA as,d on t*, influx *,i4*t
nnular capacity between hole and + nnular capacity between hole and drill pipe + ( 12.22 > 2) 1728.' + 7.121 bbl-ft "nflux volume at * bbl + (7.17'6 x ;7) @ (7.121 x 161) + 178.; bbl !. Calculat, influx olum, at s*o, as, on t*, influx *,i4*t
nnular capacity between hole and drill pipe + "nflux volume at shoe* bbl + 7.121 x 1721 + 12'.1 bbl
;. *is olum, is a r,f,r,nc, at s*o,7 t*,r,for,3 you n,,d to con,rt it to t*, ottom *ol, condition. oyle0s gas law is utili=ed in order to get the figure at the bottom hole. $1 x 51 + $2 x 52 3or this case* you need to use the maximum pressure at shoe which is the eak
