Kill sheet

Kill sheet

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 .

5. 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.

6. 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.

7. Answers 2 -Strokes from bit to shoe :- Calculate open hole to (DP/HWDP/DC) Volume For O pen 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.

8. 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

9. Answers 5-Kill Mud Weight:- Kill Mud Weight = + Current M.wt . Kill Mud Weight = +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 =450 x  

10. Answers 8 -MAASP with current mud weight:- Maximum Allowable 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.  

11. Answers 10-Step Down Chart……. Pressure Drop=(ICP-FCP)x100 / String Strokes =1100-492)x100 / 1718 = 35 psi/100 strokes Strokes Pressure,psi 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

12. Answers IWCF Kill Sheet. EXCEL Sheet .

13. 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

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