Casing Drilling Technology Implementation In Petrom

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Bryce Chapman
5 years ago
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1 Casing Drilling Technology Implementation In Petrom

2 Presentation Outline Background Overview of Petrom Casing Drilling achievements to date Benefits To Petrom from Casing Drilling Case History 228 Sotanga Notable Problems from Casing Drilling Current Challenges To Casing Drilling Way forward with Casing Drilling in Petrom 2 Casing Drilling Technology Implementation In Petrom

3 Background January 2012, Casing Drilling was identified as one of the enabling technologies to deliver some of the wells on OMV Petrom drilling sequence particularly the Sotanga wells. A plan was then developed to progress the technology by defining it as one of the Energize OMV initiatives with assigned Project Manager. First trial in OMV Petrom was performed in June 2012 on 228 Sotanga. Since then, 36 wells & 19,091m of Casing Drilling have been done in Petrom as of December 31 st Casing Drilling jobs are planned for Casing Drilling Technology Implementation In Petrom

4 Petrom Casing Drilling Jobs Year Level 9 5/8 13 3/8 20 Totals 2012 L L Totals Metres 11,872 6,193 1,026 19,091 4 Casing Drilling Technology Implementation In Petrom

5 Petrom Casing Drilling Jobs Tot Year Month Well name No. of strings OD (inch) Weight (ppf) Grade Connection June 228 Sotanga / J55 STC July 258 Colibasi /8 68 K55 TSH ER August 2014 bis Bradesti 1 9 5/8 36 K55 BTC 5 Casing Drilling Technology Implementation In Petrom Average depth (m) (28-153) 125 (25-324) 299 (47-500) October 2371 Silistea 1 9 5/8 36 K55 LTC October 1211 Vata 1 9 5/8 36 K55 BTC (50-500) December 1 Crampoaia 1 9 5/8 68 K55 TSH ER (50-580) December 3700 Gorunesti /8 68 K55 ER (45-556) December 1005 Bustuchin 1 ( ) BTC 9 5/8 36 K January 675 Tintea 1 9 5/8 47 P110 TSH Blue ( ) February 4337 Mamu February 2600 Brancoveanu February 405 Socu /8 68 L80 9 5/8 36 K55 9 5/8 47 N April 4545 Totea K55 TSH ER April 2762 Ciuresti 1 9 5/8 40 L80 BTC April 1013 Bustuchin 1 9 5/ ,5 N80 BTC TSH ER 729 BTC BTC ( ) 486 (50-719) 669 (0-503) 503 (57-554) 497 ( ) April 4566 Mitrofani /8 68 L80 TSH ER (36-612) June 2406 Ciuresti 1 9 5/8 40 L80 BTC (62-576) July 4340 Mamu /8 68 L80 TSH ER (33-767) 734 Tot Year Month Well name July 4340 Mamu /8 68 L80 TSH ER (33-767) July 676 Tintea /8 68 L80 TSH ER July 4542 Totea K55 TSH ER August 1519bis Runcu 1 9 5/ K55 BTC August 1209 Vata 1 9 5/8 36 K55 BTC August 1178 Otesti 1 9 5/8 36 K55 BTC September 1170 Otesti 1 9 5/8 36 K55 BTC October 1778 Otesti 1 9 5/8 36 K55 BTC October 1048 Otesti 1 9 5/8 36 K55 BTC October 1629 Preajba 1 9 5/8 36 K55 BTC November 2637 Merisani 1 9 5/8 36 K55 BTC November 4355 Videle 1 9 5/8 36 K55 BTC November 4381 Videle 1 9 5/8 36 K55 BTC November 4342 Mamu West /8 68 Tenaris ER December 49 Bratuia 1 9 5/8 P110 TSH Blue December 2375 Silistea 1 9 5/8 36 K55 TXP December 40 Colibasi 1 9 5/8 L80 Buttress December 604 Corbrii Mari 1 9 5/ December 5022 Turburea Bibesti No. of strings OD (inch) /8 Weight (ppf) 36 K55 68 L80 Grade Connection TXP TSH ER Average depth (m) ( ) 1197 (33-556) 523 ( ) 320 (57-600) 543 (50-253) 203 (50-252) 202 (0-253) 253 (0-252) 253 (0-260) 260 ( ) 935 (0-253) 253 (0-253) 253 (0-570) 570 (50-605) 555 (50-300) 250 (50-600) 550 ( ) 1051 (0-1452) 1452

6 Benefits To Petrom From Casing Drilling Insurance: getting the casing on depth particularly through troublesome formations. Sometimes eliminating contingency casing string Promised wells and production: actual time savings are realized using Casing Drilling over conventional drilling e.g time for tripping out of hole & running casings are eliminated. Time savings = More wells + Positive Impact on accelerated production. Strategic, volume of work: The more wells delivered with Casing Drilling the greater the benefits Reduced cost per job & incremental time savings from Casing Drilling technology application. Cost Savings Improvement Achieved: Light bit design for shallow surface casings Estimated 2013 Cost saving over 28 wells compared to conventional drilling was Other tangible savings not quantified: Earlier completion of wells with increased capacity on drilling sequence; Avoiding technical problems; Early hydrocarbons 6 Casing Drilling Technology Implementation In Petrom

7 Case History 228 Sotanga Coal Mine Sotanga Block II 2 Sotanga Commercial field Sotanga-Doicesti-Valea Resca fault Dragaesti Gheboieni Commercial Field 7 Casing Drilling Technology Implementation In Petrom

8 Offset Wells Review Why DwC on Sotanga? 228 Sotanga (2012): ~2 days on top hole with DwC (05:30am 14 th 04:30am 16 th June) 8 Casing Drilling Technology Implementation In Petrom

9 Planning of 228 Sotanga Casing: grade & type determined by stock. J55 STC 54.5# + MLT Rings. J55 STC 54.5# Torque values Min 3,860, Opt 5,140 & Max 6,430ft-lbs. Torque enhancement to 9,140 ft-lbs with Multi-Lobe Torque Rings (Torque 112 Eur/pc) Rig HH75 Top Drive Torque limitation is 20,000 ft-lbs. Maximum casing length possible on HH75 rig to accommodate DwC tool is 11.4m Cementing: Conventional Cementation. No shoe track / float equipment. No CBL planned. Shoe at ± 50m below the coal in competent formation. Good cement expected ± 50m around the shoe Concerns with state of float equipment due to continuous circulation Under-displace cement slurry to 15m inside casing & hold pressure on casing while WOC Centralizers: Engineering assessment is that centralization is not required for the shallow surface casing with 150m Contingency - Loss Circulation Procedure: same as or conventional drilling. Provision of water supply to continue drilling if total losses is encountered pumped enough to cool PDC drive shoe / casing bit ~ 600l/min & continue to drill blind Contingency - Stuck Casing Procedure: same procedure for stuck casing. Maximum pull limited by the rig ~ 60t with safety margin. 9 Casing Drilling Technology Implementation In Petrom

10 Actual Operation on 228 Sotanga Cleanout 20 conductor to 28m (5.75 hrs) push out potential junk in the hole & prevent damage to the PDC casing bit Rig up & M/Up 17-1/2 casing bit with 13-3/8 casing joint to 28m (6.75 hrs) Casing drill from 28m to 86m with bentonite spud mud (4.5hrs 7.8m/hr Avg. ROP) 2200l/m; 0 2t WOB; 50RPM; & TQ 3 3.5KFt-Lbs & 25-35bar SPP Low WOB to keep inclination of the hole to minimum Started to notice seepage loss at ~ 63m. Adjust drilling parameters. Total loss at 86m. Drill with total losses using fresh water from 86m to 153m (8.25hrs 8.12m/hr Avg. ROP) l/m; 0 2t WOB; 40 50RPM; TQ KFt-Lbs; 15 20bar Perform cement job + WOC (8.75 hrs). No returns at surface N/Up & P/Test BOP. M/Up & RIH 12-1/4 BHA (roller cone bit with steel tooth) to 140m TOC Offline Prepare Clayseal drilling mud & Top up job for the 13-3/8 casing (9.0 hrs) Displace well to drilling mud + Drill out cement from 140m to m (3 hr) Attempt to drill out shoe without success + POOH (17hrs) t WOB, 50RPM, 35bar M/Up & RIH 12-1/4 End Milling Cutter + mill shoe from m to 155m. POOH (9.50 hr) 2 6t WOB, 50RPM, 25-35bar 10 Casing Drilling Technology Implementation In Petrom

However, sometimes casing drilling might be challenging Ringed out

Ringed out CwD bit on 676 Tintea @ 980m.

11 However, sometimes casing drilling might be challenging Ringed out bit on m. Whole crown of PDC bit lost due to presence of conglomerates. Finished well conventionally. Ringed out CwD bit on m. Trip to change bit Washed out bit connection on m. Finished well conventionally, no replacement bit available 11 Casing Drilling Technology Implementation In Petrom

12 Challenges. + Opportunities Challenges.. Buy in from some stakeholders as regards casing drilling economics for shallow wells. Increase awareness of the benefits of Casing Drilling for shallow wells Casing drilling cost reduction strategies in place. Redesigned fit-for-purpose light bit now available for shallow formations / surface casing < 300m Adaptability of casing drilling tools for existing Petrom light rigs like HH75 for improved efficiency Variations in configuration of casing drilling tool assembly. Compact design of Tesco CDS tool in trials available Q Order of short length casing joints now is stock Cutting of standard casing joints to convenient length to handle Rig Suitability e.g Kelly on Futura 3 Opportunities Shallow wells & more shallow wells Applications in deeper intermediate sections L3 & L4 CD Applications 12 Casing Drilling Technology Implementation In Petrom

13 Way Forward With Casing Drilling in Petrom 2014 DwC By Casing Sizes Teams 20" 13 3/8" 13 5/8" 9 5/8" 7" 4 1/2" Total Team Team Team Team Team Istria Team Total DwC By Depth Category 2014 DwC By Levels (9-5/8", 7" & 4 1/2") < 300 > 300 Total L2 L3 L4 Total * 28 Wells requires lighter casing bits * 1st L3 in Q please plan for 9-5/8" & 7" ** 4 1/2" L4 jobs (2 in #) are planned as contigencies 13 Casing Drilling Technology Implementation In Petrom

14 Summary - Petrom 2014 Casing Drilling Plan 30 7" 9 5/8" 13 3/8" 20" 4 1/2" (Contingency) Target for 2013 = 50 wells Team 1 Team 2 Team 3 Team 4 Team 5 Istra Team 14 Casing Drilling Technology Implementation In Petrom

15 Conclusions & Recommendations Conclusions: DwC proven to be cost effective, enabling improved delivery performance. Savings : 1 to 1 ½ days on sections to 300m MD & 2 to 3 days on deeper sections. Other tangible savings from Casing Drilling: earlier completion of wells with increased capacity on drilling sequence; avoiding technical problems; early hydrocarbons. Cost savings in 2013 over 28 wells, compared to conventional drilling, (excluding retainer payments) Recommendations: Aggressively continue DwC in 2014: target 50 jobs & stretched target 60 jobs Optimize Casing Drilling contracts with service providers, investigate reducing standby & job costs. Trial Level-3 Casing Drilling (directional control), as planned in Explore the option to bring in another service provider wrt Level-3 CwD to introduce more competition. 15 Casing Drilling Technology Implementation In Petrom

16 Thank You

NEW TECHNOLOGIES INCREASE DRILLING PERFORMANCE IN OMV PETROM. March 20, Bucharest

NEW TECHNOLOGIES INCREASE DRILLING PERFORMANCE IN OMV PETROM March 20, Bucharest Route to Drilling performance? Engineering could be the key! Engineering identify real drilling problems ( check deeper