A – B – C – D – E – F – G – H – I – J – K – L – M – N – O – P – R – S – T – U – V – W – X
| LSD | Land Surface Datum |
| LIFO | Last in, first out |
| LL | Laterolog |
| LARS | Launch & Recovery System |
| LD | Lay Down (tubing, rods, etc.) |
| LOPA | Layers of protection analysis |
| LWR | Lazy-wave catenary riser |
| LCNLG | LDT CNL Gamma Ray Log |
| LDTEP | LDT EPT Gamma Ray Log |
| LIT | Lead Impression Tool |
| LEAKL | Leak Detection Log |
| LOT | Leak-Off Test |
| LACT | Lease Automatic Custody Transfer |
| LOE | Lease Operating Expenses |
| LD | Lethal dose |
| LCL | Lethal dose (low) |
| LOA | Letter of Authorisation/Agreement/Authority |
| LCV | Level control valve |
| LSH | Level safety high (sensor) |
| LSL | Level safety low (sensor) |
| LEEA | Lifting Equipment Engineers Association |
| LOLER | Lifting Operations and Lifting Equipment Regulations |
| LP | Limited partnership |
| LOGGS | Lincolnshire Offshore Gas Gathering System |
| LAOT | Linear Activation Override Tool |
| LOT | Linear Override Tool |
| LT | Linear Time or Lag Time |
| LVOT | Linear Valve Override Tool |
| LVEL | Linear Velocity Log |
| LINCO | Liner and Completion Progress Report |
| LNG | Liquefied natural gas |
| LNG | Liquefied Natural Gas |
| LPG | Liquefied petroleum gas |
| LGR | Liquid Gas Ratio |
| LP | Liquid penetrant |
| LDL | Litho Density Log |
| LITDE | Litho Density Quicklook Log |
| LEPRE | Litho-Elastic Property Report |
| LIOG | Lithography Log |
| LITHR | Lithological Description Report |
| LITST | Lithostratigraphic Log |
| LITRE | Lithostratigraphy Report |
| LPH | Litres Per Hour |
| LQ | Living quarters |
| LL | Lloyd Gulf of Mexico leasing area |
| LFRD | Load and resistance factor design |
| LMAP | Location Map |
| LOT | Lock Open Tool |
| LOTO | Lock Out / Tag Out |
| LOTO | Lock out tag out |
| LAS | Log ASCII Standard |
| LOGRS | Log Restoration Report |
| LOGSM | Log Sample |
| LWOP | Logging Well on Paper |
| LWD | Logging while drilling |
| LOGGN | Logging Whilst Drilling |
| LIBOR | London Interbank Offered Rate |
| LSBGR | Long Spacing BHC GR Log |
| LSSON | Long Spacing Sonic Log |
| LAH | Lookahead |
| LCM | Lost Circulation Material |
| LTI(FR) | Lost Time Incident (Frequency Rate) |
| LTIR | Lost time incident rate |
| LA | Louisiana |
| LMOGA | Louisiana Mid-Continent Oil and Gas Association |
| LGS | Low (specific-)Gravity Solids |
| LP | Low Pressure |
| LPWHH | Low Pressure Well Head Housing |
| LEL | Lower explosive limit |
| LFL | Lower flammable limit |
| LMRP | Lower marine riser package |
| LMV | Lower Master Valve (on a Xmas tree) |
| LRP | Lower Riser Package |
| LAT | Lowest Astronomical Tide |
| LKO | Lowest Known Oil |
| LUMI | Luminescence Log |
| LU | Lund Gulf of Mexico leasing area |