ABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO.2, P&P EXERCISES NO 1. A gas well has a total depth of 14,000 ft MD (13,100 ft TVD). The packer is set at 11,000 ft MD (10,200 ft. TVD). The annulus is full of 9 ppg completion brine, The Shut in Wellhead Pressure is 2,500 psi. Gas gradient is 0.15 psi/ft. What is the differential pressure between the tubing and annulus prior to running a tubing punch immediately above the packer? 3pts a, 745 psi more in the annulus than the tubing. b. 3248 psi more in the annulus than the tubing. 1665 psi more in the annulus than the tubing. 4d. 1950 psi more in the annulus than the tubing. ooonoo ©. 2500 psi more in the tubing than the annulus, 2. Given the following Kill Graph from a reverse circulation well kill, where the kill fluid weight is equal to the completion brine initially installed in the annulus, complete the attached step down chart. Pump displacement is 0.0157 bbis/stroke 1Opts 3500 psi} THI te Tabi Volume | Pressure (si) 500 psi oO 47.1 bbls 141 Sbbis 200 ‘Volume Pumped (bbis) Rev. 03 - 15/11/06 Aberdeen Drilling Schools 2006 11ABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO.2 Strokes THE Strokes THP 0 4800 300 5100 600 5400 900 5700 1200 6000 1500 6300 1800 6600 2100 6900 2400 7200 2700 7500 3000 7800 3300 8100 3600 8400 3900 8700 4200 9000 4500 9300 1-2 Aberdeen Drilling Schools 2006 Rev. 03 - 15/11/06ABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO.2 3. The following information has been gathered from a gas well Well depth TVD Well depth MD Formation gradient Gas Gradient 12,000 ft 12,200 0.527 0.0407 Prior to installation of the production casing and wellhead equipment , determine the following 3A. Bottom Hole Pressure psi apts 3B. Maximum Surface Pressure Dai apts 3C. From the pressures determined above indicate the correct Rated Working Pressure for the wellhead equipment. La — 2,000 psi [] >. 3,000 psi [] «5,000 psi [] 4 none of these Ipt T inch casing has been set and the 3'/, inch completion string run. Prior to perforating, the mud in the well has to be replaced with brine to balance the formation pressure. 3D. What brine density is required? {] a 91 ppg [J > 10.2 ppg {J «11-1 ppg [] 4 118 ppg Given the following additional data:- Casing capacity Tubing nominal weight Tubing grade Tubing capacity Closed End Tubing displacement Pump Displacement Kill rate End of Tubing Rey. 03 - 15/11/06 Aberdeen Drilling Schools 2006 2pts 0.04049 bbis/ft 10.2 Ibs/ft Connection, Hydril PH4 0.00899 bbI/ft 0.01190 bbI/ft 0.0899 bbI/stroke 100 strokes/min 10,200 ftMDABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO.2 2pts [J a 565 strokes [] >. 1614 strokes [] c 1,200 strokes d. 1,020 strokes 3F. Calculate how many strokes to displace the entire wellbore 2pts. 0 a, 2,511 strokes [] b. 4,370 strokes 5,005 strokes. Oo 4,264 strokes [J & none of these 4, The same level of available barriers is required for intervention operations in wells requiring artificial lift as one with natural flow. Ipt {ja TRUE [] b. FALSE 5. Who is responsible for maintaining pressure control during an intervention operation? Ipt [J a The company man The well services supervisor The intervention equipment operator [] 4 The toolpusher [] © — The production supervisor 14 Aberdeen Drilling Schools 2006 Rev. 03 - 15/11/06ABERDEEN DRILLING SCHOOL, PRODUCTION WELL KILL EXERCISES NO.2 6. Given the following data, calculate the time required to pump bottoms up, for reverse circulation. 3pts. DAT: ‘Tubing depth : 9,250 ft MD, 8,600 ft TVD. Tubing capacity - 0.0025 bbi/ft. Annular capacity - 0.0052 bbI/ft. Pump rate - 0.75 bpm. a 29min, (Jb 31min. © 60min, (] 4 64min, (Je 88min. Of 95 min. ‘en the following data, calculate the time required to pump one full circulation, 3pts DATA: ‘Tubing depth - 9,250 ft MD, 8,600ft TVD. Tubing capacity - 0.0025 bbWit. Annular capacity - 0.0072 bbi/ft. Pump rate - 0.5 bpm. {J a 180 min. (J > 31min. (Jc. 60min. (J) 4. 64min. (Je 88min. (] & 95min. 8 Figure 2 overleaf shows a reverse circulation kill graph that has been generated for a constant ID/OD tubing containing gas and oil with a heavy completion fluid in the annulus. The kill fluid is lighter density than the fluid installed in the annulus on completion. 8A. What is the tubing volume ? Answer bbls 2pts Rev. 03 - 15/11/06 Aberdeen Drilling Schools 2006 165ABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO2 8B. What is the annulus volume? 2pts Answer bbls 8C. What would the annulus pressure be after pumping 700 bbls of kill fluid? 2pts Answer psi 2500 2367 { AT| | 2000 ~| -TubingHead_| | : “Pressure J fio | - {4 + He 1500 ot t44 Se a Surface | t ss ae Sey ee epi el En (esi) _|_| | pressure i 1000 | IN Z 571 psi in z 500 bbls. E 500 | 0 200 54 400 600 Volume Pumped (bbls) Figure 2 : Reverse Circulation Kill Graph. Aberdeen Drilling Schools 2006 Rev. 03 - 15/11/06ABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO.2 8D. At what point does the hydrostatic pressure of the fluid in the tubing equal formation pore pressure? 3pts am oaw > IEEE eee 8E. At what point is the annulus full of kill brine and the tubing full of completion brin 3pts © oP amo wD oOooooo es ("X"/44) 100 Total Points Scored Note "X" Rev. 03 - 16/11/06 Aberdeen Drilling Schools 2006 17ABERDEEN DRILLING SCHOOL PRODUCTION WELL KILL EXERCISES NO.2 P&P EXERCISES NO.2 - ANSWE! Strokes THE Strokes THP 0 3500 4800 350 300 3200 5100 325 600 2900 5400 300 900 2600 5700 275 1200 2300 6000 250 1500 2000 6300 225 1800 1700 6600 200 2100 1400 6900 175 2400 1100 7200 150 2700 800 7500 125 3000 500 7800 100 3300 475 8100 15 3600 450 8400 50 3900 425 8700 25 4200 400 9000 0 4500 375 9300 0 1-8 Aberdeen Drilling Schools 2006 Rev. 03 - 15/11/06ABERDEEN DRILLING SCHOOL, PRODUCTION WELL KILL EXERCISES NO.2 3.A) 6320 - 6328 psi B) 5831 - 5839 psi 8. A) 500 bbls B) 700 bbis C) 800 psi b)b Eye Rev. 03 - 15/11/06 Aberdeen Drilling Schools 2006 1-9