Downloaded 221 times
Apbu Casing Drilling Review Dec2010
- 1. CASING DRILLING™ REVIEW FOR ASIA PACIFIC BUSINESS UNIT By Andrew Harris – Manager, CASING DRILLING™ DRILLING™ Email: andrew_harris@tescocorp.com WE SEE DRILLING
- 2. CASING DRILLING® Candidate Selection Wells where tophole sections are controlled drilled for hole cleaning Wells with Borehole Stability Problems Wells withBorehole Stability Problems Wells with significant Lost Circulation Wells where CASING DRILLING® can eliminate a casing string CASING DRILLING can provide significant time savings in areas where high rig CASING DRILLING® can provide significant time savings in areas where high rig rates apply Utilising a small rig – Single mast, small pumps, Limited Horsepower
- 3. CASING DRILLING® Benefits: Wellbore Strengthening Significant reduction in lost fluids when Drilling with Casing due to “Plastering Effect” (continuously Plastering Effect (continuously trowelling of the wellbore wall by the couplings) Filter Cake is plastered into the wall Filter Cake is plastered into the wall and is not scraped off by bit trips or tool joint impacts Cuttings are ground up finer and less Cuttings are ground up finer and less cuttings are returned to surface Instead they are plastered into the wall, strengthening the wellbore wall, strengthening the wellbore Reduced Losses and Improved borehole stability
- 4. TESCO Casing Drilling®Systems Casing String MOTOR BHA ROTARY STEERABLE BHA Drill Lock D ill L k Non Retrievable – Assembly Drillable Casing Shoe Level 2 system Casing Profile + No rig modification, very Nipple easy to implement + Can drill out for Directional Retrievable BHA’s – BHA s Internal subsequent casing strings Level 3 & 4 - Vertical holes only and 1 Stabilizers + Allows for multiple bit/bha changes bit / hole section + Allows directional control, LWD + No Rig Modifications Required Casing Shoe - Requires up-front Eng. / planning. PD Motor Casing String MWD Under‐ Reamer Float Collar Roller Reamer Tesco XCD™ PDC Non‐Mag diamond enhanced Drill Collar CASING DRILLING® Bit UG UG MWD / LWD MWD / LWD Stabilizer designed to drill soft to Float Sub medium‐soft formations at high rates of Rotary Steerable Rotary Steerable penetration 12,000 psi UCS D‐exp >1.0 Pilot Bit
- 5. CASING DRILLING™ Global Experience OVER 3.2 MILLION FEET DRILLED WITH CASING Subsea Casing Drilled with 4 Motor BHA 31 Casing drilled with Rotary Steerable Tools 104 Directional Casing Drilling 7 ll d h l h Drilled while Coring with Casing 629 Drilled with retrievable assembly 144 Drilled with drillable shoe 330 Drilled with disposable bit Complexity Updated 10/31/2010
- 6. CASING DRILLING™ APBU 2007 ‐ 2010 • Total 26 CD wells • 23 x 13 3/8” / 3 x 9 5/8” • 9 Level II • 17 Level III s 17 Level III’s Level II (ft) Level III (ft) l (f ) l (f ) Total Ftg. l • 25 Offshore / 1 Onshore 7,619 40,077 47,773 • All Level 3 using Motor Assy’s ll l ’ • LWD – Gamma / Res / PWD • 9 Wells were Dir. From Platforms • Inclinations 20° to 76° • 3 Wells, used Gyro Mwd for collision avoidance • 4 Wells from Semi‐Submersible 4 Wells from Semi‐Submersible
- 7. CASE HISTORIES Malaysia
- 8. CASING DRILLING® Implementation Objectives for implementing retrievable CASING DRILLING™ : 1. Improve the safety and efficiency of casing running and handling with a stabber less casing drive system (CDS™); 2. Prove the concept of batch CASING DRILLING™ commercially and technically; 3. To enable CASING DRILLING™ to become the base case for drilling top hole 3 To enable CASING DRILLING™ to become the base case for drilling top hole sections; 4. Prove the directional capability of 13 3/8‐in. CASING DRILLING™ assemblies; 5. Minimize flat times associated with conditioning and cleaning the hole in soft unconsolidated directional top hole sections in the field; 6. Improve the drilling performance in the top hole formations though superior hole 6 Improve the drilling performance in the top hole formations though superior hole cleaning with 13 3/8‐in. casing versus 5 1/2‐in. drill pipe; 7. Log the section with gamma, resistivity and annular pressure while CASING DRILLING™ ; DRILLING™ ; 8. Casing drill from the conductor shoe to section TD in one run.
- 9. Success Offshore Brunei Operator: Shell Brunei Petroleum (BSP) Rig: BIMA (Jack‐Up) Casing Size: 13 3/8 72lbs/ft, L80, VAM TOP Casing Size: 13‐3/8 – 72lbs/ft, L80, VAM TOP Operations: Drilled to the MWD flowrate maximum of 800gpm Drilled 580m, average penetration rate of 120m.hr (390ft.hr) No hole cleaning issues. Torque and Drags trended Drilled with Seawater, pump Hi Vis pills every joint Drilled with Seawater, pump Hi‐Vis pills every joint Highlights: No QHSE incidents occurred implementing a “New Technology” No rig modification are required, just make up TESCO CDS™ to TDS Faster on‐bottom ROP CASING DRILLING™ vs Conventional drilling Successfully hung Casing in the wellhead and cemented Once Drilled it’s Cased, the Motor assembly is tripped back thru O D ill d it’ C d th M t bl i t i d b k th the casing at TD ©2010 TESCO Corporation
- 10. Performance CASING DRILLING™– Batch Drilled Surface Intervals 1st WELL BHA: Mud Motor w/1.5º bend / LWD (gamma/res./ pwd) & Gyro‐MWD Drilled to TD at 1005m ‐ 815m @ 82m/hr avg on Btm ROP Built angle from 8.4º to 37.9º Lost Circulation, switched to seawater to complete section 2nd WELL BHA: Mud Motor w/1.5º bend / LWD (gamma / res./pwd) Drilled to TD at 1201m ‐ 1001m @ 100m/hr avg. on Btm ROP Built angle from 11º to 58º B ilt l f 11º t 58º Good FIT prior to drilling 12‐1/4” section. CASING DRILLING Saved 6.41days / 3 wells ©2010 TESCO Corporation OTC 20880
- 11. Subsea CASING DRILLING™Implementation Exploration Well - Offshore Sarawak CHALLENGE Subsea Exploration well from Semi‐Submersible Water Depth of 340’ Regulations – Have to drill 8‐1/2” pilot hole for Shallow Gas Require LWD Logs over section Seismic shows no anomalies, low risk of Shallow Gas Seismic shows no anomalies, low risk of Shallow Gas SOLUTION Implement TESCO CASING DRILLING® Technology 1st Well Drilled to TD – 2,191ft in 3.6 bit hrs @ 608ft/hr avg 2nd Well Drilled to TD – 2,281ft in 4.7 bit hrs @ 485ft/hr avg 3rd Well Drilled to TD – 2,330ft in 4.3 bit hrs @ 543ft/hr avg Well Drilled to TD 2,330ft in 4.3 bit hrs @ 543ft/hr avg Eliminate the 8‐1/2” pilot hole Superior hole cleaning than Conventional drilling Faster on‐bottom ROP than Conventional drilling Faster on bottom ROP than Conventional drilling CASING DRILLING Saved 1.25 days over Conventional ©2010 TESCO Corporation Well
- 12. Subsea CASING DRILLING™Implementation Exploration Well – West Malaysia CHALLENGE Subsea Exploration well from Semi‐Submersible in 55m water with subsea BOP stack Require LWD Logs over section Fault predicted at 950m, potential losses or p pressure connectivityy SOLUTION Use retrievable CD‐BHA ‐ MWD/ LWD / Motor assembly to drill 13‐3/8” Casing from 20” shoe to TD at 1100m Drilled to TD at 1100m – 650m in 13hrs @ 50m/hr avg. on Btm ROP Bt Reduce risk of hole problems associated with losses Reduce risk of hole problems associated with borehole instability borehole instabilit ©2010 TESCO Corporation OTC 20880
- 13. OBSERVATIONS AND OBSERVATIONSAND LESSONS LEARNT APBU Tophole CASING DRILLING™ p
- 14. DEPTH VS ANNULAR VELOCITY CASING DRILLING™ vs 5 ½” DP ” 0 13-3/8" Casing in 26" Conductor Velocity @ 700gpm Comparison of Annular Velocity @ 1100gpm Velocities 200 5 ½” DP x 17 ½” hole ” ”h l 5.5" DP in 26" vs 13 3/8” Casing x 17 ½” hole 400 Conventional DP Limit ROP to ~60m/hr 5-1/2" 600 Drillpipe in 13-3/8" Casing 17-1/2" CASING DRILLING™ epth, in 17-1/2" mtrs Openhole Openhole • Superior Hole Cleaning m De 800 • Faster Penetration Rates 1000 1200 BUSINESS CASE FOR CASING DRILLING™ MALAYSIA 8" BHA in 1400 0 10 20 30 40 50 60 70 80 90 100 Annular Velocity m/min
- 15. Lessons Learnt – APBU CASING DRILLING™ Lessons Learnt – APBU CASING DRILLING™ Well Planning Single point of contact from concept through to implementation Project Management – TESCO LEADS!‐ We understand the SYSTEM and interfaces Detailed Risk Assessments Detailed CASING DRILLING™ programs (Eng./ Equip. / Procedures / Contingencies / Well Control) Alignment with DD company as to directional / logging objectives and drilling performance
- 16. Lessons Learnt APBU 13 3/8”Directional CASING DRILLING™ Motor with a 1.5° bend and Milltooth bit capable of >6°/30m DLS (100% slide) Motor with a 1.5º bend and PDC bit capable of 3.5º/30m DLS (100% Slide) Mitigate against high dogleg severities – recommend a 1.15° bend on motor CASING DRILLING™ w/ motor assy –dropping tendencies in soft formations Steady toolfaces while sliding, no hanging up in either well from 36° to 58° with 13 3/8” Casing First implementation of Gyro‐MWD in CASING DRILLING™ system for surveys / collision avoidance – no issues. No issues running LWD – Real‐time Gamma / Resistivity / Pressure While Drilling g / y/ g Trending Torques &Drags while CASING DRILLING™ is essential for success. CASING DRILLING with mud No issues with detection from MWD CASING DRILLING™ with mud – No issues with detection from MWD CASING DRILLING™ with seawater – Detection issues surveys / real‐time data
- 17. Directional Performance 13 3/8” CASING DRILLING™ 100% slide : 2.0 – 5.8°/30m at the start of section Wellplan • 80 slide /20 Rot : 4.5 – 5°/30m • Planned DLS is 2.5°/30m • In Rotary – Assy dropping ‐0.9°/30m / y / • Total ratio for Slide / Rotary : 49% / 51% • B ild I f Build Inc. from 8.43° t 60° 8 43° to 60° • Avg ROP rotating : 120 – 180 m/hr • Turn Azi from 125° to 115° then left to 126° • Avg Rop Sliding : 80 – 100m/hr
- 18. Cuttings‐ CASING DRILLING™ Seawater Tophole West Malaysia Seawater / Hi‐Vis sweeps CASING DRILLING Tophole with Motor CD‐ CASING DRILLING™ Tophole with Motor CD BHA c/w 1.5º bend Seawater c/w 20bbl Hi‐Vis sweeps every j joint, Claystone formation , y Directional CASING DRILLING™ at +400m/hr (Inst)
- 19. Tophole 13 3/8” CASING DRILLING™ East Malaysia ‐ Seawater Block height FAST !! CASING DRILLING™ Tophole with Motor CD‐ BHA c/w 1.5º bend Seawater c/w 20bbl Hi‐Vis sweeps every S t / 20bbl Hi Vi joint, sandstone formation Directional CASING DRILLING™ at +1400ft.hr +1400ft hr
- 20. Cuttings‐ CASING DRILLING™ KCL‐PHPA MUD Tophole West Malaysia p y KCL‐PHPA Mud • Mud System – Inhibits reaction with clays • Cuttings are removed – even sliding • At higher ROP’s difficult to remove solids • Mud Wt increases while drilling – ECD’s • Observe higher break over torque at conns Observe higher break‐over torque at conns. • Spend time Circulating hole clean
- 21. MWD Detection Top hole CASING DRILLING™ Experience in APBU using Seawater Top hole CASING DRILLING™ with a Mud System – No issues with Survey / real‐time LWD detection MWD Systems are primarily setup for drilling with mud system 13 3/8 Casing Drilling with Seawater less viscous fluid 13 3/8” Casing Drilling with Seawater – less viscous fluid Issues with detection ‐ Cavitation / turbulent flow / Noise / Attenuation of signal/ Smaller Signal) Company A Solution ‐ R d d S l i Reduced modulator gap to 0.12mm – S d l 0 12 Stronger Pulse P l Set Frequency of 16Hz at 3BPS – Decodable signal while drilling / surveying Company B Signal attenuates going from BHA ID to larger Casing ID (therefore better for smaller casing sizes) Changed MWD pulser ‐ slower bigger pulse q y p ( y y) Frequency 0.5Hz at 3bps worked for detection with seawater (D&I surveys only) However the above is not Compatible with Gwd Implemented EM Tools (Electro‐Magnetic pulse MWD) in‐combination with mud‐pulse tools successful.
- 22. Lessons Learnt APBU Cementing Issues Presently not using Centralization on the Casing p y j Decision taken to perform ‘Poor‐boy’ cement job Under‐displace cement, drop the top plug only Typically hold pressure for 5.5hrs – ok Pumped 50% excess‐ No returns to surface due to over‐gauge hole Increase to 75% excess CBL – yielded good cement Surface Wellhead Issues Surface Wellhead Issues PDDP Q1, 2011 Keep the Wellhead hanger assembly loose Faster method of installation with the CDS™ After release BHA with PDRT, pick up hanger and Land – no wiper trip
- 23. Lessons Learnt APBU – Shallow SS Wells Lessons Learnt APBU – Semi‐Submersible Rigs Alignment – ballast control needs to keep “double bubble” Can be an issue, best practice keep a slope indicator in Doghouse b b k l h Water Depth – Currently only using in Shallow Water depths – 350ft At TD, require to POH with Casing, to space out to run CHRT or Wellhead hanger At TD require to POH with Casing to space out to run CHRT or Wellhead hanger Can Casing Drill Riser‐less or with SSBOP stack installed in shallow water 13 3/8” x 16” thru potential Shallow gas, higher ECD’s than 8 ½” hole pilot hole
- 24. Conclusion ‐ Highlights in APBU Footage ft 30,000 No accidents or injuries from CASING DRILLING™ after 47,773ft Level II (ft) 25,000 Level III (ft) TESCO DOWNHOLE TOOL RELIABILITY – 100%!!!! 20,000 Total Ftg 15,000 Track Record in APBU with Global relevance 10,000 5,000 Some 1st in CASING DRILLING™ operations 0 2007 2008 2009 2010 Directionally Drilling 13 3/8” Casing to inclinations of 58º ‐ 76º Di ti ll D illi 13 3/8” C i t i li ti f 58º Drilling with Retrievable CASING DRILLING™ system from a Semi‐Submersibles (Subsea) Successfully deployed Gyro Mwd in BHA for tophole Anti‐collision Successfully deployed Gyro Mwd in BHA for tophole Anti collision Gamma Logged thru 9 5/8” Casing in PNG – No attenuation of the Signal Proved up Performance CASING DRILLING tophole formations with Seawater Proved up Performance CASING DRILLING™ tophole formations with Seawater Inst. ROP’s of +1600ft.hr (+500m/hr), Average ROP’s of 390ft.hr (120m/hr)