Table T6. Tool replacement strategies for use if a wireline or LWD/MWD tool is lost downhole and appropriate recovery efforts are unsuccessful.
Primary
tool
Alternate I
Alternate II
Wireline
HNGS NGT NGT
HLDS HLDT CNT-G
DSI LSS No backup
FMS FMS No backup
GHMT No backup
DLL DLL DIT
DIT DIT DLL
BHTV No backup
WST WST No backup
GLT No backup
AACT No backup
LWD
CDR CDR No backup
AND AND No backup
MWD MWD No backup
LINC No backup

Notes: LWD = logging while drilling, MWD = measurement while drilling, HNGS = Hostile Environment Gamma Ray Sonde, NGT = Natural Gamma Ray Spectrometry Tool, HLDS = Hostile Environment Litho-Density Sonde, HLDT = Hostile Environment Litho-Density Tool, CNT-G = Compensated Neutron Tool, DSI = Dipole Sonic Imager, LSS = Long Spacing Sonic Tool, FMS = Formation MicroScanner, GHMT = Geological High Resolution Magnetic Tool, DLL = Dual Laterolog, DIT = Dual Induction Tool, BHTV = Borehole Televiewer tool, WST = Well Seismic Tool, GLT = Geochemical Logging Tool, AACT = aluminum activation clay tool, CDR = Compensaged Dual Resistivity tool, ADN = Azimuthal Density Neutron tool, LINC = LWD Inductive Coupling tool.