99-10_casing-tarr_table1.html (Oct-1999)

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Table 1. Proposed classification of SWD options
NCR 1	NCR 2	CR 1	CR 2	CR 3	CR 4	CR 5	CR 6	CR 7
No Casing Rotation (NCR)		*Casing Rotated (CR)**
Casing/liner to running tool, drill pipe to surface	Casing to surface	Casing/liner to running tool, drill pipe to surface					Casing to surface
Bit and under-reamer turned by motor assy. run on inner rstring. swab cup above motor assy. Assy. pulled on inner string.	Bit and under-reamer turned by motor assy. latched into bottom joint of casing string. Assy. pulled on wireline.	Bit and under-reamer turned by motor assy. run on inner string below casing spear. Assy. pulled on inner string.	Bit and free rotating casing. shoe core bit sub turned by motor run on inner string. Bit pulled on inner string.	Bit and fixed casing shoe core bit (or under-reamer) both rotated from surface. Bit pulled on inner string or left downhole.	Bit and casing shoe core bit both turned by rotation from surface. Bit pulled on wireline or left downhole.	Casing shoe core bit turned from surface. Steerable motor assy. latched in casing Assy. pulled on wireline.	Bit, under-reamer and casing shoe core bit turned by surface rotation only. Assy. pulled on wireline.	Casing shoe core bit with steerable motor assy. and under-reamer latched in casing Assy. pulled on wireline.
Cementing possible before POH with bit.	Cementing possible only after POH with bit.
Status, August 1999
Planned	Built & run	Built & run	Built & run	Built & run	Built & run	Concept only	Built & tested	Built & tested
20-in. casing, Shell Deep Water Team	13-in. casing, Unocal Indonesia	11 3/4-in. liner, Amoco Hod	7-in. & 9 5/8-in. liner, Mobil Arun, Amoco Valhall	California Ops. Mobil Arun & High Island	5 1/2-in. & 7-in. liner Amoco Valhall (16-in. concept)	Up to 16 in.	4 1/2 in., 5 1/2 in., 7 5/8 in., 9 5/8 in. Tesco test well	5 1/2-in., 7-in. csg. Tesco test well sidetracks
* Speed depends on whether motor included.

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