This document discusses the key calculations involved in a kill sheet for plugging and abandoning an oil well. It explains that a kill sheet is used to determine well parameters like volume, strokes, time, mud weights, and circulating pressures. It provides step-by-step worked examples of calculating strokes, times, kill mud weight, initial and final circulating pressures, and a step down chart. The calculations allow operators to safely pump heavy kill mud into the well to displace the drilling fluid before cementing and abandoning the well.

1. Kill Sheet
Calculations

2. Kill Sheet
Manual calculation or
program??

3. Introduction
 Kill sheet calculations it’s very important Sheet when we decided to kill the
well.
 It used to read the well by determine well parameters/features.
Such as
 Volume, strokes & time Calculations ….why?
 Maximum Mud Weight of Drilling Fluid….why?
 MAASP….why?
 Kill Mud Weight K.M.W. …why?
 Initial/Final Circulating Pressure (ICP,FCP) …. Why?
 Draw Step Down Chart….why?

4. Sequence of kill sheet solution
 1-Draw Your Own well profile case.
includes The main features. (Vertical, Deviated, Horizontal)
 Location of each Tubular inside Hole.
 2-Put the Data on the profile.
 3-Start the calculations.

7. Answers
First of all we’ve to determine 3 things :-
A- Drill pipe Length = MD - (DC Length + HWDP Length)
=11095-(630+450)= 10015 ft.
B-Open hole Length= MD – Cased hole
=11095 – 8856 = 2239 ft.
C-Drill Collar=450ft., HWDP=630ft.
Total of Drill Collar and HWDP=1180ft < Open hole section
So all DC and HWDP in Open hole section.
Then the remaining O.H Section will have DP.
Length of DP in O.H Section = 2239-450-630= 1159 ft.
Length of DP in cased Hole =8856 ft.

8. Answers
1-Strokes from Surface to bit:-
Calculate Drill string Volume (DP/HWDP/DC)
 For Drill pipe:-
=Drill pipe Capacity bbl./ft. x length of drill pipe
=0.0178 x 10015 = 178.267 bbl.
 For Heavy walled Drill pipe:-
=HWDP Cap. Bbl./ft. x length of HWDP
= 0.0088 x 630 = 5.544 bbl.
 For Drill Collar
=DC Cap. Bbl./ft. x length of DC
=0.0077 x 450 =3.465 bbl.
Total Volume inside String = 187.276 bbl.
No of Strokes =Total Volume (bbl.) / POP (bbl./stroke)
=187.276 / 0.109 =1718 strokes
Time=No. Of strokes / SPM= 1718/40 =42.95 mint.

9. Answers
2-Strokes from bit to shoe :-
Calculate open hole to (DP/HWDP/DC) Volume
 For Open Hole / Drill Collar:-
=(O.H /Drill Collar) Capacity bbl./ft. x length of Drill Collar
=0.0271 x 450= 12.195 bbl.
 For Open Hole / Heavy walled Drill pipe:-
=(O.H/ HWDP) Cap. Bbl./ft. x length of HWDP
=0.0439 x 630 = 27.657 bbl.
 For Open Hole / Drill Pipe:-
=(O.H/DP) Cap. Bbl./ft. x length of DP
= 0.0439 x 1159 = 50.88 bbl.
 Total Volume inside String = 90.72 bbl.
 No of Strokes =Total Volume (bbl.) / POP (bbl./stroke)
= 90.72 / 0.109 = 832 strokes
 Time= No of strokes / SPM =832/40=20.8 mint.

10. Answers
3-Strokes from bit to surface:-
 Calculate cased hole to DP Volume:-
=Drill pipe Capacity bbl./ft. x length cased hole ft.
=0.0493 x 8856 =436.6 bbl.
 No of Strokes =Total Volume (bbl.) / POP (bbl./stroke)
= 436.6/ 0.109 = 4005 strokes
 So Strokes from Bit to surface = 4005+832 =4837 strokes
 Time=4837/40= 120.9 mint.
 Time for surface line “7 bbl.” =7/0.109 =64.22/40=1.6 mint.
4-Time for Complete Circulation=120.9+42.9+1.6= 165.4 mint

11. Answers
5-Kill Mud Weight:-
Kill Mud Weight =
𝑺𝑰𝑫𝑷𝑷
𝟎.𝟎𝟓𝟐𝒙𝑻𝑽𝑫
+ Current M.wt.
Kill Mud Weight =
𝟔𝟓𝟎
𝟎.𝟎𝟓𝟐𝒙𝟏𝟏𝟎𝟗𝟓
+12 =13.12 PPG
6-Initial Circulating Pressure:-
ICP = DYNAMIC PRESSURE LOSS + SIDPP
ICP = 450 + 650 = 1100 psi.
7-Final Circulating Pressure:-
FCP= DYNAMIC PRESSURE LOSS x
𝐊.𝐌.𝐖
𝑪𝒖𝒓𝒓𝒆𝒏𝒕 𝑴.𝑾𝒕
=450 x
𝟏𝟑.𝟏𝟐
𝟏𝟐
= 𝟒𝟗𝟐

12. Answers
8-MAASP with current mud weight:-
 Maximum Allowable M.WT =(
𝐋𝐎𝐓 𝐏𝐫𝐞𝐬𝐬𝐮𝐫𝐞
𝟎.𝟎𝟓𝟐𝒙𝐒𝐡𝐨𝐞 𝑻𝑽𝑫
+ 𝐋𝐨𝐭 𝐌. 𝐰𝐭)
=(1700/0.052x8856) + 10.3= 14 ppg.
 MAASP = (Maximum M.wt. - Current M.wt.)x0.052xShoe TVD
 MAASP = ( 14 – 12 ) x 0.052 x 8856 = 921 psi.
9-MAASP after circulation of kill mud:-
=Maximum M.wt. – K.M.W x 0.052 x Shoe TVD
=(14 - 13.12) x 0.052 x 8856= 405 psi.

13. Answers
 10-Step Down Chart…….
Pressure Drop=(ICP-FCP)x100 /
String Strokes
=1100-492)x100 / 1718 = 35
psi/100 strokes
0
200
400
600
800
1000
1200
0 500 1000 1500 2000
Step Down Chart
Step Down Chart
Strokes Pressure,psi
0 1100
100 1065
200 1030
300 995
400 960
500 925
600 890
700 855
800 820
900 785
1000 750
1100 715
1200 680
1300 645
1400 610
1500 575
1600 540
1700 505
1718 492

14. Answers
IWCF Kill Sheet.
EXCEL Sheet.

15. Answers
1. Strokes Surface to Bit = 1718 Strokes
2. Strokes Bit to Shoe = 832 Strokes
3. Strokes Bit to Surface = 4844 Strokes
4. Kill Mud Weight = 13.2 ppg
5. Initial Circulating Pressure = 1100 psi
6. Final Circulating Pressure = 495 psi
7. MAASP with current mud weight = 921 psi
8. MAASP after circulation of kill mud = 368 psi
9. Time for complete circulation = 164 minutes

16. ‫أشكركم‬