LACT

Lag Time

Lagoonal Deposits

Lamellar Corrosion

Laminar Flow

Laminated Sands

LAN (computer)

Land Casing

Landman

Landing Nipple

Langelier Index

LAP (packer)

Lap

welcome

Laser

Laser Distribution

Latch

Latch On

Lateral (wellbore)

Lateral (load)

Laterlog

Latex

Lava

Law of Capture (hydrocarbon movement)

Layer

Laying Down Pipe

LCA

LCM

LCP

LCTD

LD

LDC (transport)

LDFN

LDHI (hydrates)

LDPE

LDS (wellhead)

Lead Cement

Lead Lines (pipeline)

Leak Off Rate

Leak-Off Test

Lean Gas

Lease (drilling)

Lease Hound

Least Principal Stress

LEL

Lens

Levelwind

LIB

Lift Cost

Lift Curve

Lifting Frame

Lifting Cost

Lifting Sub

Lift-Off Pressure (mud)

Light Crude

Light Ends

Lignite

Light Weight Cement

LIL

Limited Entry

Line Drive

Linear Darcy Law

Linear Gel

Liner (casing)

Liner (perforating charge)

Liner (sand control)

Liner Hanger

Liner Lap

Liner Tie-Back

Liquefied Natural Gas or LNG

Liquefied Petroleum Gas or LPG

Liquid Holdup

Liquid Level

Lithification

Litho-Density(tm) Log

Lithofacies Map

Lithologic Log

Lithology

Lithosphere

Lithostatic Pressure

Live Oil

Live Well Workover

LLD (logging)

LLRT

LLS (logging)

LMRP

LNFT-IA

LNG

LO (reservoir fluid)

Load Cell

Load Fluid

Lock

Log

Log Header

Log-Inject-Log

Logged Depth

Logging While Drilling

Long Radius Well

Long String

LOP

Losal

Lost Circulation

Lost Circulation Control Agent or LCA

Lost Circulation Materials or LCM

Lost Circulation Zone

Lost Returns

LOT (drilling)

Low Alloy Steel

Low Carbon Steel

Low Energy System (geologic)

Low Pressure Squeeze

Low Pressure Water Cleaning

Low Solids Mud

Lower Completion

Lower Crown Plug (subsea)

Lower Kelly Valve

LP (facilities)

LPG

LPS (downhole gauge)

LPS

LPSA

LPSD

LPT (downhole gauge)

LRP

LS

LSA (scale)

LSFO

LSOBM

LTA (seals)

LTA

LT&C

LTBS

LTOBM

LTRM

LTS

LTS (downhole gauge)

LTSI

LUB

Lubricants

Lubricator

LWD

LWRP

Lyohilic