Overcoming Challenging Narrow Mud Weight Window of 0.35 ppg: Successful MPD & MPC Application in Offshore Malaysia - A Case History

Transcription

1 Overcoming Challenging Narrow Mud Weight Window of 0.35 ppg: Successful MPD & MPC Application in Offshore Malaysia - A Case History Lee Jin Ming, Drilling Engineer / PETRONAS (Presenter) Mizuar Omar, Senior Drilling Fluid Engineer / PETRONAS Freddy Rojas, MPD Engineering Manager / MISWACO 1

2 Field Location TA WELL Malaysia Map 2

3 TA Well Background While drilling 6 hole: Fracture: 18.3 ppg Pore Pressure: 16.7ppg Cementing deemed impossible, suspended 2010 m-md 9-5/8 csg 7 liner TA Well revisit planned with MPD applications 6 hole 2090 m-md Planned well TD: 2350 m-md 3

4 6 Hole MPD Plan Top kill well Shoe DLOT = 18.6 ppg Actual TD DFIT Well Results = ppg PP = ppg Worst case 0.35 ppg!! 4

5 Measured Depth (m-mddf) Measured Depth (m-mddf) SPE/IADC Managed Pressure Drilling Plan Versus Actual of Drilling Phase TA WELL MPD BASIS OF DESIGN Equivalent Mud Weight (ppg) TA WELL MPD PLOT SUMMARY - AFTER TD '' m-mddf PLANNED Equivalent Mud Weight (ppg) " Liner Shoe ACTUAL Top F10 S , Top F ,195 Top H01 Top F Top H Top H ppg Top H Well TD EST. PORE PRESSURE GRADIENT(NOOP) ECD+SBP Surface MW FRACTURE GRAD (ppg) EWM CONN.(ESD+SBP) prognosed PP (ppg) Prognosed FG (ppg) (ppg) ACTUAL FG BASED 5 ON DFIT Actual PP (ppg) Drilling MW (ppg) ECD + SBP (ppg)

6 ppg ppg ppg MW MW TRIP MUD DISPLACEMENT 6 BHA Tripping Out 18.3 PPG 16.3 ppg MW Well was top-killed with 18.3ppg mud at 1200m, 18 ppg TD (50psi overbalance). 7" Top of 1890m-MDDF 7" 2010m-MDDF m-MDDF

7 18.3 ppg PPG SPE/IADC Managed Pressure Drilling RIH Liner to 1200m, displace 4-1/2 Running 18.3ppg to 16.3ppg. RIH SBP = 112psi 16.3 ppg MW 16.3PPG 16.3 ppg MW 16.3 ppg ppg 16.3 ppg 16.3 ppg 16.3PPG ppg MW 16.3 ppg ppg ppg MW MW 16.3 ppg MW 16.3 ppg MW 1\\\ RUNNING LINER AND UNDERBLANCED FLUID DISPLACEMENTS RIH Liner to 600m, displace 18.3ppg to 16.3ppg. RIH SBP = 15psi End of Disp. SBP = 112psi End of Disp. SBP = 240psi RIH Liner to 1700m, displace 18.3ppg to 16.3ppg. RIH SBP=240psi End of Disp. = 450psi RIH Liner to 2334m, displace 18.3ppg to 16.3ppg. RIH SBP= 450psi End of Disp. = 650psi 7" Top of 1890m-MDDF 7" 2010m-MDDF 2350m-MDDF 7

8 4-1/2 Liner Displacement 8

9 4-1/2 Liner Managed Pressure Cementing (MPC) Challenges Constant bottom hole pressure 0.35 ppg pressure window Zero human error communication High static underbalance 640psi Well loss & gain 9

10 Managed Pressure Cementing Plan (without SBP) FG = 18.5 ppg (as per cementing company simulation, calibrated to equivalent of 18.17ppg) to the actual PP = ppg. 10

11 Managed Pressure Cementing Plan (with SBP) Operating window 11

12 Actual Managed Pressure Cementing Graph Wash spacer weighted spacer Cement slurry Displacement 12

13 Cement Quality Liner cementing without gains / losses. USIT log result below previous shoe 13

14 Conclusion Cementing possible in marginal pressure window. MPC success depends on: Valid hydraulic simulations. Reliable MPD system. personnel training, communication protocols & clear procedures Successful MPC set new standard for operator. Exploring full MPD utilization: 14

15 Appreciation PETRONAS MISWACO Acknowledgement Co-Authors: Trigunadi Setiawan, Warjanto Saikam, Mohammed Mousa, Sagi V. R Raju, Ahmad Zahir, W Nor Afiqah, M Abshar B M Noor, Mizuar Omar, PETRONAS; Freddy Rojas, Andi Eka Prasetia, Dylan Richards, MISWACO 15