South Tuam Tshoj Hiav Txwv LS-A ultra-deepwater zoo nta ultra-dej qhov tob nrog qhov sib sib zog nqus reservoir ncua, ib tug raug ultra-deepwater zoo. Lub qhov dej nkag mudstone tsim los ntawm sab saum toj mus rau hauv qab. Lub siab coefficient ntawm lub hom phiaj tseem ceeb yog 1.03. Qhov ntsuas kub ntawm lub hom phiaj tseem ceeb ntawm lub sijhawm yog los ntawm 34.6 txog 36.0 degree, nrog rau qhov kub hauv qab kwv yees li 38.4 degree.
Raws li cov ntaub ntawv geological thiab offset zoo tsom xam, qhov tsim kev ntseeg siab (FIT) siab coefficient ntawm φ508 mm casing khau yog qis dua 1.14 (qhov tseeb FIT: 1.10). The well has a narrow safe density window and high risk of lost circulation. Kev tswj hwm ECD thiab txo qis kev poob qis yog lub hom phiaj tseem ceeb ntawm kev tswj xyuas qhov dej no.
Tus neeg teb xov tooj hloov chaw rau FLAT-ECD SBM ntawm 1.03 sg kom ua tiav ECD qis.
Thaum lub sij hawm teb daim ntawv thov ntawm FLAT-ECD tiaj-rheology hluavtaws-raws li av nkos (SBM) nyob rau hauv Well LS-A, cov kua tuav ruaj khov rheological zog thoob plaws qhov kub thiab txias, xa superior inhibition thiab lubricity thaum ua kom qis ECD. Tripping thiab wireline txiav ua haujlwm ua haujlwm zoo; lub qhov ntsuas qhov dej tau zoo, thiab cov casing tau khiav mus rau tag nrho qhov tob hauv ib qho kev khiav uas tsis muaj teeb meem hauv qhov downhole. Lub voj voog tsim kho zoo rau Well LS-A yog 28.5 hnub, piv rau lub voj voog tiag tiag ntawm 19.13 hnub, teeb tsa cov ntaub ntawv tshiab rau lub voj voog kev tsim kho sai tshaj plaws rau cov qhov dej hauv ntug dej tob.
|
Ib Ø |
Drilling kua |
Tshooj |
Casing |
|
914.4 hli (36 ") |
Dej hiav txwv jetting |
0 → 1,811 m |
N/A |
|
660.4 hli (26 ") |
Seawater qhib Circuit Court + viscous bentonite slurry |
0 → 2,130 m |
Ø508 hli (20 ") rau 2,123.83 m |
|
444.5 hli (17-1/2 ") |
FLAT-PRO drilling kua |
2,130 → 2,349 m |
Ø 339.7mm (13-3/8 ") rau 2,343.03m |
|
311.15 hli (12-1/4 ") |
FLAT-PRO drilling kua |
2,349 → 2,483 m |
TD, dai liner |
Txhawm rau daws qhov kev sib tw nqaim-margin drilling, FLAT-ECD system yog tsim los rau cov ntawv thov qis-ECD kom txo qis kev poob siab thiab txhim kho cov nqi ntws. Los ntawm kho nws tag nrho cov rheological profile, lub kaw lus mitigates sag peev xwm nyob rau hauv ib tug dav siab thiab kub lub hnab ntawv.
Nws xa cov peev txheej raug ncua rau kev ua haujlwm zoo, thaum khaws ECD hauv lub qhov rais ua haujlwm siab. Lub kaw lus ua tau kev ntseeg siab nyob rau hauv txwv borehole seem.
Highlights ntawm flat-rheology kua formulations:
Nrog cov khoom hnyav hnyav hnyav:
- Txo sag tendency
-Suppressed ECD spikes
- txo qis kev pheej hmoo ntawm kev ploj mus thiab ballooning
Nrog ib tug leaner kua thiab tsawg gel zog:
- Txhim kho qhov ntxuav, txo lub zog thiab rub
-ROP siab dua
-Ntau dua tripping speeds
-Optimized cement tso rau kev txhim kho zoo kev ncaj ncees