Capillary string:

Commonly used for hydraulic control of safety valves and sliding sleeves.

May also transmit bottom hole gauge data.

Terms Related to Capillary string

• Reeled tubing

  Lighter-duty well maintenance than hydraulic workover, employing small od tubing capable of descending down the production string under well pressure

• Multiple completion

  An arrangement for producing a well in which one wellbore penetrates two or more petroleum-bearing formations. In one type, multiple tubing strings are suspended side ...

• Production tubing

  A string of tubing used to produce the well, providing well control and energy conservation.

• Macaroni string

  A string of tubing or pipe, usually 3/4 or 1 inch in diameter.

• Concentric tubing workover

  A workover performed with a small-diameter tubing work string inside the normal tubing. Equipment needed is essentially the same as that for a conventional workover ...

• Sliding sleeve

  A special device placed in a string of tubing that can be operated by a wireline tool to open or close orifices to permit circulation ...

• Work string

  The string of drill pipe tubing suspended in a well to which is attached a special tool or device that is used to carry out ...