Production rig:

A well servicing unit consists of a hoist and engine mounted on a wheeled chassis with a self-erecting mast.

A workover rig is basically the same, with the addition of a substructure with rotary, pump, pits, and auxiliaries to permit handling and working a drill string.

Terms Related to Production rig

• Back-in unit

  A portable servicing or workover rig that is self-propelled, using the hoisting engines for motive power. Because the driver's cab is mounted on the end ...

• Truck-mounted rig

  A well-servicing and workover rig that is mounted on a truck chassis.

• Drive-in unit

  A type of portable service or workover rig that is self-propelled, using power from the hoisting engines. The driver's cab and steering wheel are mounted ...

• Workstring

  A string of pipe used in workover of well-servicing operations; not typically considered as production tubing.

• Portable mast

  A mast mounted on a truck and capable of being erected as a single unit. See telescoping derrick.

• Double-post mast

  A well-servicing unit whose mast consists of two steel tubes. Double-pole masts provide racking platforms for handling rods and tubing in stands and extend from ...

• Single-pole rig

  A well-servicing unit whose mast consists of but one steel tube, usually about 65 feet long.