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Operations |
General Practices |
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1. Conductors at jacket level |
Ensure cap not dropped into conductor Ensure that no loose items or junk on bottom Check that conductor not crimped Mark conductor with red paint in case conductor sinks during production Take extreme care when POOH in case bit/stabilisers hook up on bottom of conductor |
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2. Conductors below seabed |
Remove cap prior to operations Diver required to guide bit into conductor As above |
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3. Prior to Drilling Operations |
Ensure 1 000 bbl of spud mud mixed and available Enough chemicals to drill 36in hole sector on board 30in casing is on board Divers on board as required |
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4. Position rig |
Position rig Jack up and level |
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5. 30in conductor (multi-well jackets only) |
30in conductor driven to refusal (+/- 25m) |
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6. Drill 36in hole (exploration wells only) |
Drill surface hole with 26in bit and 36in hole opener Use seawater with viscous pills Survey as required Control drilling rate Run TOTCO survey and confirm less than 0.5 deg inclination |
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7. Run and cement 30in casing (exploration wells only) |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up shoe track, check float equipment with water Run centraliser as per Drilling Programme Sting into shoe with drill pipe and cement casing. Prepare to perform top job with stinger if no cement returns WOC minimum 4 hours |
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8. Drill 26in hole |
Divers to cut window in 30in conductor Drill 26in hole to depth specified in Drilling Programme Use seawater with viscous pills Pump at 1 200 gpm or greater Survey as required Sweep hole and spot 100 bbls viscous pill on bottom Take TOTCO survey at section TD |
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9. Run and cement 20in casing |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up and check stab in float equipment with water Run centraliser as per Drilling Programme Cement casing and bump plug. Pressure test casing against plug Prepare to perform top up job with stinger if no cement returns (Divers to observe cement returns) WOC minimum 4 hours Run divertor and pressure test (As in programme) |
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10. Drill 17.1/2in/16in hole |
Rig up and function test diverter Drill 17.1/2in/16in hole depth specified in Drilling Programme Use seawater with viscous pills Pump at 1 200 gpm Survey as required Sweep hole clean and spot 300 bbls viscous pill on bottom |
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11. Run and cement 13.3/8in casing |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up shoe track, check float equipment with water Run centralisers as per Drilling Programme Install ECP or MSIPC if required Cement casing and bump plug. Pressure test casing against plug Prepare to perform top up job with stinger if no cement returns WOC minimum 4 hours Lift riser and install 20.3/4in x 13.3/8in back-off seal assembly Nipple down diverter Install 13.5/8in x 5 000 psi casing head housing |
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12. Drill 12.1/4in hole |
Nipple up 13.5/8in BOP stack and pressure test as per Company standards (500/5000 psi) Pressure test casing to 2500 psi Circulate well to low solid non dispersed mud Drill out 13.3/8in shoetrack Drill 10 feet of new formation and perform formation integrity test limited to 0.65 psi/ft gradient Drill 12.1/4in hole to depth specified in Drilling Programme Pump at ± 800 gpm or as per motor requirements Survey as required Run intermediate logs if required Remove wear bushing |
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13. Run and cement 9.5/8in casing |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up shoe track, check float equipment with water Install MSIPC as needed Run centralisers as per Drilling Programme Cement casing and bump plug. Pressure test casing against plug Prepare to perform top up job with stinger if no cement returns WOC minimum 4 hours During cementing operations, rotate and reciprocate casing (not possible in highly deviated wells) Lift BOP and install 13.5/8in x 11in 5 000 psi tubing head spool Reinstall BOP stack and test same to 500/5 000 psi |
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14. Drill 8.1/2in hole |
Install wear bushing Pressure test casing to 3500 psi Circulate well to non-damaging polymer mud Drill 10 feet of new formation and perform formation integrity test limited to 0.65 psi/ft gradient Drill 8.1/2in hole through reservoir sections to depth specified in Drilling Programme Pump at ± 400 gpm or as per motor requirements Survey as required |
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15. Log 8.1/2in hole |
Run open hole logs specified in Drilling Programme Borehole must be smooth, clean and conditioned for logging Confirm availability of fishing equipment for all logging tools Loggers to safely secure/locate explosives/radioactive sources Wiper trip to TD, circulate condition mud Retrieve wear bushing |
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16. Perform drill stem test subject to log results according to testing programme (exploration wells only). |
Circulate/condition the hole prior to running openhole DST Measure and record all tools, prepare/issue running list Include a pup joint for correlation; run log before setting packers - if required Rig up, make secure and pressure all test lines Fill annulus prior to opening test tool, thereafter monitor level Drilling Supervisor to be present during all setting/opening/recovery and unseating/POOH with DST tools; tests will not start in darkness Well is to be monitored for swabbing; continuous fill-up is NOT permissible while POOH Follow reverse-out procedures to ensure optimum recovery |
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17. Run and cement production casing/liner subject to drill stem tests and logs |
Run 5.1/2in/7in casing Measure, drift and number casing, clean/inspect threads Conditioning trip, spot a 40 bbl Hi-Vis pill (70 FV) Change bottom rams to casing rams and pressure test Threadlock float shoe and float collar Make up shoe track, check float equipment with water Centralisers as per Drilling Programme Pup joint will be located above of each pay zone if available Mud left in annulus after cementing will be treated with Biocide Preflush brine will be equivalent density to mud; treat with SAPP and Biocide |
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18. Completion and clean up |
Run completion as per Programme Perforate according to log analysis Clean up well until BS&W<1% Flow well |
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19. Suspend or abandon |
Suspend for completion by Petroleum Engineering Submit notice of Intention to Abandon including proposed plug intervals to operations Isolate all permeable zones with 200 ft of cement above/below each zone. Casing; 70 ft. above/100 ft below shoe Ensure isolation between producing formations |
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Operations |
General Practices |
|
|
1. Conductors at jacket level |
Ensure cap not dropped into conductor Ensure that no loose items or junk on bottom Check that conductor not crimped Mark conductor with red paint in case conductor sinks during production Take extreme care when POOH in case bit/stabilisers hook up on bottom of conductor |
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2. Conductors below seabed |
Remove cap prior to operations Diver required to guide bit into conductor As above |
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3. Prior to Drilling Operations |
Ensure 1 000 bbl of spud mud mixed and available Enough chemicals to drill 36in hole sector on board 30in casing is on board Divers on board as required |
|
|
4. Position rig |
Position rig Jack up and level |
|
|
5. 30in conductor (multi-well jackets only) |
30in conductor driven to refusal (+/- 25m) |
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|
6. Drill 36in hole (exploration wells only) |
Drill surface hole with 26in bit and 36in hole opener Use seawater with viscous pills Survey as required Control drilling rate Run TOTCO survey and confirm less than 0.5 deg inclination |
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|
7. Run and cement 30in casing (exploration wells only) |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up shoe track, check float equipment with water Run centraliser as per Drilling Programme Sting into shoe with drill pipe and cement casing. Prepare to perform top job with stinger if no cement returns WOC minimum 4 hours |
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8. Drill 26in hole |
Divers to cut window in 30in conductor Drill 26in hole to depth specified in Drilling Programme Use seawater with viscous pills Pump at 1 200 gpm or greater Survey as required Sweep hole and spot 100 bbls viscous pill on bottom Take TOTCO survey at section TD |
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9. Run and cement 20in casing |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up and check stab in float equipment with water Run centraliser as per Drilling Programme Cement casing and bump plug. Pressure test casing against plug Prepare to perform top up job with stinger if no cement returns (Divers to observe cement returns) WOC minimum 4 hours Run divertor and pressure test (As in programme) |
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10. Drill 17.1/2in/16in hole |
Rig up and function test diverter Drill 17.1/2in/16in hole depth specified in Drilling Programme Use seawater with viscous pills Pump at 1 200 gpm Survey as required Sweep hole clean and spot 300 bbls viscous pill on bottom |
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11. Run and cement 13.3/8in casing |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up shoe track, check float equipment with water Run centralisers as per Drilling Programme Install ECP or MSIPC if required Cement casing and bump plug. Pressure test casing against plug Prepare to perform top up job with stinger if no cement returns WOC minimum 4 hours Lift riser and install 20.3/4in x 13.3/8in back-off seal assembly Nipple down diverter Install 13.5/8in x 5 000 psi casing head housing |
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12. Drill 12.1/4in hole |
Nipple up 13.5/8in BOP stack and pressure test as per Company standards (500/5000 psi) Pressure test casing to 2500 psi Circulate well to low solid non dispersed mud Drill out 13.3/8in shoetrack Drill 10 feet of new formation and perform formation integrity test limited to 0.65 psi/ft gradient Drill 12.1/4in hole to depth specified in Drilling Programme Pump at ± 800 gpm or as per motor requirements Survey as required Run intermediate logs if required Remove wear bushing |
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13. Run and cement 9.5/8in casing |
Measure, drift and number casing. Clean/inspect threads Threadlock guide shoe and float collar Make up shoe track, check float equipment with water Install MSIPC as needed Run centralisers as per Drilling Programme Cement casing and bump plug. Pressure test casing against plug Prepare to perform top up job with stinger if no cement returns WOC minimum 4 hours During cementing operations, rotate and reciprocate casing (not possible in highly deviated wells) Lift BOP and install 13.5/8in x 11in 5 000 psi tubing head spool Reinstall BOP stack and test same to 500/5 000 psi |
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14. Drill 8.1/2in hole |
Install wear bushing Pressure test casing to 3500 psi Circulate well to non-damaging polymer mud Drill 10 feet of new formation and perform formation integrity test limited to 0.65 psi/ft gradient Drill 8.1/2in hole through reservoir sections to depth specified in Drilling Programme Pump at ± 400 gpm or as per motor requirements Survey as required |
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15. Log 8.1/2in hole |
Run open hole logs specified in Drilling Programme Borehole must be smooth, clean and conditioned for logging Confirm availability of fishing equipment for all logging tools Loggers to safely secure/locate explosives/radioactive sources Wiper trip to TD, circulate condition mud Retrieve wear bushing |
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16. Perform drill stem test subject to log results according to testing programme (exploration wells only). |
Circulate/condition the hole prior to running openhole DST Measure and record all tools, prepare/issue running list Include a pup joint for correlation; run log before setting packers - if required Rig up, make secure and pressure all test lines Fill annulus prior to opening test tool, thereafter monitor level Drilling Supervisor to be present during all setting/opening/recovery and unseating/POOH with DST tools; tests will not start in darkness Well is to be monitored for swabbing; continuous fill-up is NOT permissible while POOH Follow reverse-out procedures to ensure optimum recovery |
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17. Run and cement production casing/liner subject to drill stem tests and logs |
Run 5.1/2in/7in casing Measure, drift and number casing, clean/inspect threads Conditioning trip, spot a 40 bbl Hi-Vis pill (70 FV) Change bottom rams to casing rams and pressure test Threadlock float shoe and float collar Make up shoe track, check float equipment with water Centralisers as per Drilling Programme Pup joint will be located above of each pay zone if available Mud left in annulus after cementing will be treated with Biocide Preflush brine will be equivalent density to mud; treat with SAPP and Biocide |
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18. Completion and clean up |
Run completion as per Programme Perforate according to log analysis Clean up well until BS&W<1% Flow well |
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19. Suspend or abandon |
Suspend for completion by Petroleum Engineering Submit notice of Intention to Abandon including proposed plug intervals to operations Isolate all permeable zones with 200 ft of cement above/below each zone. Casing; 70 ft. above/100 ft below shoe Ensure isolation between producing formations |
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