Well Control Kill Sheet (Wait & Weight)

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80 rows x 6 columns

A B C D E F G H I J K L M N O P
1 Well Control Kill Sheet — Wait & Weight
2 Blue cells on yellow are inputs. Record the slow circulating rate pressure before drilling out; enter the kick data once the well is shut in and stable.
3
4 Well Geometry
5 Measured depth of the bit (TD) 12500 ft
6 True vertical depth of the bit 11800 ft
7 Casing shoe measured depth 8500 ft
8 Casing shoe true vertical depth 8200 ft
9 Casing inside diameter (9⅝" 47 lb/ft) 8.681 in
10 Bit (open hole) diameter 8.5 in
11
12 Drill String
13 Component OD (in) ID (in) Length (ft) Capacity (bbl/ft) Volume (bbl)
14 Drill pipe (length = TD less the BHA) 5 4.276 11,360 0.01776 201.8
15 Heavy-weight drill pipe 5 3 540 0.00874 4.7
16 Drill collars 6.5 2.813 600 0.00769 4.6
17 Drill string 12,500 211.1
18
19 Annulus (open hole below the shoe, casing above)
20 Section Hole ID (in) Pipe OD (in) Length (ft) Capacity (bbl/ft) Volume (bbl)
21 Drill collars × open hole 8.5 6.5 600 0.02914 17.5
22 Heavy-weight × open hole 8.5 5 540 0.04590 24.8
23 Drill pipe × open hole 8.5 5 2,860 0.04590 131.3
24 Drill collars × casing 8.681 6.5 0 0.03216 0.0
25 Heavy-weight × casing 8.681 5 0 0.04892 0.0
26 Drill pipe × casing 8.681 5 8,500 0.04892 415.8
27 Annulus 12,500 589.4
28
29 Mud, Pump and Shoe
30 Original mud weight 11.2 ppg
31 Leak-off test at the shoe, as an equivalent mud weight 14.8 ppg
32 Pump output at the running efficiency 0.102 bbl/stk
33 Kill rate 30 spm
34 Slow circulating rate pressure at the kill rate 650 psi
35 10-minute gel strength 12 lb/100ft²
36
37 Kick Data
38 Shut-in drill pipe pressure (SIDPP) 420 psi
39 Shut-in casing pressure (SICP) 610 psi
40 Pit gain 15 bbl
41
42 Kill Mud and Circulating Pressures
43 Formation pressure (mud hydrostatic + SIDPP) 7,292 psi
44 Kill mud weight to balance the formation 11.884 ppg
45 Kill mud weight (rounded up to 0.1 ppg) 11.9 ppg
46 Initial circulating pressure (ICP) 1,070 psi
47 Final circulating pressure (FCP) 691 psi
48 Pressure to break circulation (gels in the string) 122 psi
49
50 Strokes and Time at the Kill Rate
51 Strokes, surface to bit 2,070 stk
52 Strokes, bit to surface 5,778 stk
53 Strokes, one full circulation 7,848 stk
54 Time, surface to bit 69 min
55 Time, one full circulation 262 min
56
57 Shoe and Influx
58 MAASP with the original mud 1,535 psi
59 MAASP with kill mud to the shoe 1,237 psi
60 Influx height (filling the open-hole annulus from the bit) 515 ft
61 Influx gradient 0.213 psi/ft
62 Likely influx Gas
63 Casing pressure check OK: SICP below MAASP
64 Kill mud check OK: kill mud below the shoe's leak-off EMW
65 Influx position check OK: influx below the shoe
66
67 Drill Pipe Pressure Schedule (kill mud pumped down the string)
68 Step Strokes Drill pipe pressure (psi)
69 0/10 0 1,070
70 1/10 207 1,032
71 2/10 414 994
72 3/10 621 956
73 4/10 828 918
74 5/10 1,035 880
75 6/10 1,242 842
76 7/10 1,449 804
77 8/10 1,656 767
78 9/10 1,863 729
79 10/10 2,070 691
80 Kill mud at surface (FCP held) 7,848 691
Drill pipe pressure schedule 0 500 1,000 1,500 Drill pipe pressure (psi) 0 2,000 4,000 6,000 8,000 Strokes pumped
Drill pipe pressure

Description

A Wait & Weight kill sheet on one page. Enter the well, the drill string and the slow circulating rate pressure ahead of time. Once the well is shut in and stable, add SIDPP, SICP and the pit gain. The sheet returns the kill mud weight, the initial and final circulating pressures, the strokes and time to the bit and for one full circulation, MAASP with the original and the kill mud, an estimate of the influx height and gradient, and the drill pipe pressure schedule as a table and a chart. Three checks flag a casing pressure at or above MAASP, a kill mud as heavy as the shoe's leak-off, and an influx tall enough to reach the casing.

Parameters:

  • Well geometry: Bit MD and TVD, casing shoe MD and TVD, casing ID and bit size (ft, in)
  • Drill string: OD, ID and length of the heavy-weight and the collars. Drill pipe makes up the rest of the depth (in, ft)
  • MW: Original mud weight (ppg)
  • LOT: Leak-off test at the shoe, as an equivalent mud weight (ppg)
  • Pump output, kill rate, SCR pressure: Output per stroke at the running efficiency (bbl/stk), the kill rate (spm), and the slow circulating rate pressure recorded at that rate with the original mud (psi)
  • Gel strength: 10-minute gel, for the pressure needed to break circulation after the shut-in (lb/100ft²)
  • SIDPP, SICP, pit gain: Stabilised shut-in pressures (psi) and the volume gained (bbl)

Method: Formation pressure = 0.052 × MW × TVD + SIDPP. Kill mud weight = MW + SIDPP / (0.052 × TVD), rounded up to the next 0.1 ppg. ICP = SIDPP + SCR pressure. FCP = SCR pressure × KMW / MW. Pipe capacity is ID² / 1029.4 bbl/ft and annular capacity (Dh² − Dp²) / 1029.4. The annulus is split into six sections: each string component against open hole and against casing, with each section's length the overlap of the component with that interval. Strokes are volume divided by pump output. MAASP = (LOT EMW − MW) × 0.052 × shoe TVD. The influx is assumed to fill the open-hole annulus upward from the bit, so its height follows from the pit gain and the section capacities. Its gradient is 0.052 × MW − (SICP − SIDPP) / height, read as gas below 0.25 psi/ft and as water above 0.40. The schedule drops drill pipe pressure in ten equal steps from ICP to FCP while kill mud fills the string, then holds FCP until kill mud reaches surface. The formulas are the sheet's own _PO.DE.* LAMBDAs, so it calculates with no add-in installed.

Example: A 15 bbl kick taken at 12,500 ft MD / 11,800 ft TVD with 11.2 ppg mud, SIDPP 420 psi and SICP 610 psi. That needs 11.9 ppg kill mud, ICP 1,070 psi and FCP 691 psi, with about 2,070 strokes to the bit at 30 spm. The influx gradient of about 0.21 psi/ft reads as gas.

How to use this blueprint
  1. In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
  2. Search for Well Control Kill Sheet (Wait & Weight)
  3. Click on the blueprint to preview
  4. Click Insert to place it into your worksheet. Modify the input values to match your data.
Tags:
drillingwell-controlkill-sheetwait-and-weightkickkill-mud-weightICPFCPMAASPstrokes

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