Abbr.

Loss of energy.

See lost circulation.

Lower kelly cock n: see drill stem safety valve

A substance added to cement slurries or drilling mud to prevent the loss of cement or mud to the formation.

See bridging materials.

abbr: logging while drilling.

See low-solids mud

A drilling mud that contains a minimum amount of solid material (sand, silt, and so on) and that is used in rotary drilling when possible because it can provide fast drilling rates.

A plug that fits in the bore of a subsea tree, usually below the tubing hanger, to serve as the primary barrier against reservoir pressure.

Liquefied petroleum gas

A facility located at the surface for the purpose of:

A colloid that is not easily precipitated from a solution and is readily dispersible after the precipitation by an addition of the solvent.

A person who negotiates with the land or mineral rights owner to secure a lease to drill.

A colloid that is readily precipitated from a solution and cannot be redispersed by an addition of the solution.

1.

To apply grease or oil to moving parts

2.

To lower or raise tools in or out of a well with pressure inside the well.

The term comes from the fact that a lubricant (grease) is often used to provide a seal against well pressure while allowing wireline to move in or out of the well.

Abbr.

Liquefied natural gas.

Having an affinity for the suspending medium, such as bentonite in water.