BP_WellControlToolkit.xls
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KILL SHEET For Vertical / Deviated Wells with Surface BOPs Version 4.0, May 1997
Units (UK/US):
Well No: SM 1004 Rig: PD - 228 Date: Hole Size (inch): 8.5 Casing OD (inch): 9.625 Shoe TVD (m) Openhole Weak Point: TVD (m) 1995 MD (m) 2647 Csn Burst (psi): 5830 Baryte on Site (MT): 1000
17-Dic-02 Time: 1992 Shoe MD (m) Fracture Grad EMW (sg): Reserve Mud Vol (bbl):
UK 6.00 2644 1.98 300
Drill String Contents (From Surface to Bottom) DP Size 1: DP Size 2: Heavy Weight DP: Drill Collar:
OD 5 5.5 5 6.25
ID 4.276 4.778 3 2.25
(bbl/m) Len (m) 0.05827 2125 0.07275 2471 0.02868 1882 0.01613 100
Depth (m) 2125 4596 6478 6578
Vol (bbl) 123.8 179.8 54.0 1.6
Cumulative Volume (bbl) 303.6 357.6 359.2
Annulus Contents (From Surface to Bottom) Casing/Hole ID Strg OD Capacity (bbl/m) Len (m) Casing: 9.85 6.625 0.16932 2125 8.681 5 0.16048 2471 8.5 5 0.15057 1882 8.5 6.25 0.10576 100 Surf Input Line: OD= ID= 3.00 in Choke Line: OD= ID= 3.00 in Total Circ System Vol (bbl): 1413 Surf Active (bbl):
Depth (m) 2125 4596 6478 6578 Length (m): Length (m): 350
Vol (bbl) Cumulative Volume (bbl) 359.8 396.6 756.4 283.4 1039.7 10.6 1050.3 60 Vol (bbl): 1.7 50 Vol (bbl): 1.4 Total Active Mud Vol (bbl): 1763
Pumping Data Pump 1 Liner (in): 5.5 Pump 2 Liner (in): 5.5 PUMP 1 SPM bbl/min Pscr 20 1.707 1160 30 2.561 1260 40 3.414 1600
Max Pres (psi): 5000 Vol Eff (%): 97 100% bbl/stk: 0.088 Max Pres (psi): 5000 Vol Eff (%): 97 100% bbl/stk: 0.088 PUMP 2 KILL CIRCULATION TIMES (min) Total bbl/min Pscr Pump No Surface to Bit Bit to Shoe Shoe to Chk 1.707 1170 1 210.4 355.7 259.5 826 2.561 1275 140.3 237.1 173.0 550 3.414 1620 105.2 177.8 129.8 413
Kick Data Time Shut-In: 10.05 Mud Weight in Hole (sg): SIDPP (psi): 400 Kill MW (sg), MW2=
Bit at TD (m): 6578 TVD (m): 1.800 PV (cP): 30 Shut-in Casing Pres (psi): 650 1.865 Barytes Required (lb/bbl):
4309 YP (lbf/100ft^2): Shut-in Pit Gain (bbl): 40.8 Total (MT):
18 20 32.6
Pressure Losses Kill Pump SPM: 30 Bit Circ Pressure Losses (psi): bbl/stroke: 0.08536 Nozzles Surf Input Pipe: 8 Kill Rate (bbl/min) 2.561 (in^2) Inside Drill String: 599 SCR Pres (psi): 1260 0.451 Drill Bit: 79 Slimhole Kill - APL to be compensated
Annular Pressure Loss (APL) (psi): APL - Based on SCR Test: 575 APL - Directly Calculated: 614 Accepted APL: 600
BP_WellControlToolkit.xls
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Kill Data Kill Start Time: Over-B Safety Factor (psi): Initial Circ Pres (psi):
100 1160
Kill Mud to Reach: Pump Strokes: Pump Pres (psi):
Drill Bit: 4208 784
Choke: 16512 1306
MAASPs (psi): Static: 496 Circulating: 233
Standpipe Pressure (For Pumping Down Kill Mud Through Drill String) Section Point: From: To: To: To: To: To: To:
Surface: Kick Off: End Build 1: DP Cross-Over: End Tangent 1: End Build/Drop 2: Drill Bit:
MD (m) TVD (m) Vol (bbl) 0 0 0.0 230 230 13.4 1983 1608 115.5 2125 1670 123.8 5614 3488 332.8 0.0 6578 4309 359.2
Time (min) 0 5.2 45.1 48.4 130.0 0.0 140.3
Standpipe Pressure (psi) 1160 ( =Pic ) 1140 1021 1016 857 784
( =Pfc )
STANDPIPE PRESSURE CHART
1400 Standpipe Pressure (psi)
Strokes 0 157 1354 1451 3899 0 4208
1200 1000 800 600 400 200 0 0
500
1000
1500
2000 2500 3000 3500 Pump Strokes to Bit (Stroke)
4000
4500
5000
STANDPIPE PRESSURE TABLE Pump Pred. DP Stroke Pres (psi) 0 1160 140 1142 280 1128 420 1114 560 1100 700 1086 840 1072 980 1058 1120 1044 1260 1030 1400 1018 1540 1010 1680 1001 1820 992 1960 983 2100 974
Actual DP Pressure (psi)
Actual Choke Pressure (psi)
Pump Stroke
Pred. DP Actual DP Actual Choke Pressure Pressure Pressure (psi) (psi) (psi) 2240 965 2380 956 2520 946 2660 937 2800 928 2940 919 3080 910 3220 901 3360 892 3500 883 3640 874 3780 865 3920 852 4060 819 4208 784 Hereafter maintain DP pressure constant @ 784 psi
BP_WellControlToolkit.xls
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GENERAL KILL PROCEDURE Pump Start Up Procedure: ~ When the choke pressure gauge starts to respond in each step, manipulate the choke valve to adjust the choke pressure according to the table on the right. ~ Zero the stroke counter when kill mud has reached rig floor. ~ When the pump has reached the kill speed, record the initial circulating pressure and compare with the calculated value. ~ If the recorded and calculated values are close to each other, continue the kill operation. If they are significantly different, stop
Pump Speed (SPM) 0 6 12 18 24 30
Choke Pressure (psi) 650 550 450 350 250 150
Drillpipe Pressure (psi) 400 552 704 856 1008 1160
the pump, shut-in the well and investigate. If choke pressure in the above table is constant, the conventional kill method will be used, which will ignore Annular Pressure Loss (APL) to provide an over-balance pressure. If choke pressure is decreasing during pump start up, the slimhole technique will be used, which will compensate APL during kill. When APL is relatively high however, it may be impossible to fully compensate APL. In this case, the choke pressure will reduce to zero and the choke valve become wide-open during pump start up.
Displacing Drillpipe and Annulus with Kill Mud: Once the pump has reached kill speed, the choke valve should be adjusted to control the DP pressure so that the bottom hole pressure is maintained constant. This means that: ~ During the 1st complete circulation using Driller's method, the DP pressure be maintained constant at the initial circulating pressure. ~ When kill weight mud is being pumped down the drillpipe (using either Driller's or W&W), the DP pressure be adjusted according to the standpipe pressure chart & table shown in the 2nd page of the kill sheet. Once the kill mud has entered into the annulus, the DP pressure should be maintained constant. However, at some point when the annulus is being displaced by kill mud, or after the influx is out of hole, the choke valve may become wide-open. From then on, DP pressure will increase gradually while choke valve is kept at the full open position. This will continue until the kill mud reaches the choke, at which DP pressure should be equal or close to the value shown in the "Kill Data" Section.
Complete Kill Operation: ~ When the kill mud has returned to surface, stop the pump and close the choke valve to check drillpipe and choke pressures. ~ If both drillpipe and choke pressures are zeros, open the BOP and further flow-check the annulus. ~ A further complete circulation should be carried out. In the mean time, a suitable overbalance should be added to the mud weight.
