The added effect produced by two processes working in combination.

It is greater than the sum of the individual parts.

A mixture consisting of finely divided colloidal particles floating in a liquid.

The particles are so small that they do not settle but are kept in motion by the moving molecules of the liquid (brownian movement).

Lease operator or pumper.

A squeeze cement job with open perfs above the packer.

An explosive method utilizing primacord, which is an instantaneous textile-covered fuse with a core of very high explosive.

It is used to create an explosive jar inside st5uck drill pipe or tubing so that the pipe may be backed off at the joint immediately above where it is stuck.

To pull rods and tubing from a well at the same time.

Tubing must be “stripped” over the rods a joint at a time.

The downhole assembly used to lift fluid to the surface by the reciprocating action of the sucker rod string.

Basic components are barrel, plunger, valves, and hold-down.

Two types of sucker rod pumps are the tubing pump, in which the barrel is attached to the tubing, and the rod, or insert, pump, which is run into the well as a complete unit.

Drill pipe, drill collars, casing, or tubing that has inadvertently become immovable in the hole.

Sticking may occur when drilling is in progress, when casing is being run in the hole, or when the drill pipe is being hoisted.

A device that prevents leakage along a piston, rod, propeller shaft, or other moving part that passes through a hole in a cylinder or vessel.

It consists of a box or chamber made by enlarging the hole and a gland containing compressed packing.

On a well being artificially lifted by means of a sucker rod pump, the polished rod operates through a stuffing box, preventing escape of oil and diverting it into a side outlet to which is connected the flow line leading to the oil and gas separator or to the field storage tank.

For a bottomhole pressure test, the wireline goes through a stuffing box and lubricator, allowing the gauge to be raised and lowered against well pressure.

The lubricator provides a pressure-tight grease seal in the stuffing box.

The foundation on which the derrick or mast and usually the drawworks sit.

It contains space for storage and well-control equipment.

A blowout prevention device consisting of a gland and packing arrangement bolted to the wellhead.

It is often used to seal the annular space between tubing and casing.

1.

The process of lowering the drill stem into the wellbore when the well is shut in on a kick and when the weight of the drill stem is sufficient to overcome the force of well pressure.

2.

The process of putting tubing into a well under pressure.

A blowout preventer placed on the seafloor for use by a floating offshore drilling rig.

1.

A rubber disk surrounding drill pipe or tubing that removes mud as the pipe is brought out of the hole.

2.

The pressure-sealing element of a stripper blowout preventer see stripper head.

A crystalline acid derived from sulfuric acid that is sometimes used in acidizing.