Improved coil tubing injector unit

Details Improved coil tubing injector unit Improved coil tubing injector unit

1995-06-16

1996-10-22

Dang, Hoang C.

Wells

Processes

Placing or shifting well part

166 773, 166 855, 226173, 226196, E21B 1922

Patent

active

055667643

ABSTRACT:
A coil tubing injector unit is shown for injecting tubing into a well bore. A main injector frame is positioned adjacent the well bore and includes a longitudinal opening which defines a vertical run for the injector unit which is alignable with the well bore vertical axis. Gripper block assemblies are carried on the main injector frame and include plier-like halves which are pivotable between an open position and a closed, gripping position as the assemblies enter the vertical run so that the plier halves grip a selected length of tubing fed into the main injector frame along the central vertical axis of the injector unit to inject the tubing into the well bore. The profile of the vertical run is designed to minimize loading on the gripper block assemblies. The section modulus of the material used to manufacture the vertical run is also designed to allow a controlled flex of the run in order to soften the gripper loading as the gripper block assemblies enter the vertical run.

REFERENCES:
patent: 1288866 (1918-12-01), Friel
patent: 3128930 (1964-04-01), Lehnert
patent: 3700158 (1972-10-01), Schatz et al.
patent: 5133405 (1992-07-01), Elliston
patent: 5309990 (1994-05-01), Lance
patent: 5346112 (1994-09-01), Ziemek et al.

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