Well tubing paraffin cutting apparatus and method of operation

Details Well tubing paraffin cutting apparatus and method of operation Well tubing paraffin cutting apparatus and method of operation

1974-10-02

1976-09-21

Purser, Ernest R.

Wells

Processes

Cleaning or unloading well

166174, 166226, 166315, E21B 2100, E21B 3702

Patent

active

039813649

ABSTRACT:
Apparatus for use in removing paraffin from a well tubing string above a wireline operated subsurface safety valve assembly installed in the tubing string and its method of operation. The safety valve assembly controls the flow of production oil and/or gas fluids through the tubing string. During normal production operations a wireline connects the paraffin cutting apparatus to surface facilities which include apparatus for maintaining sufficient tension on the wireline to hold the safety valve assembly in open position and for releasing tension on the wireline to permit the safety valve assembly to close. The paraffin cutter apparatus contains means for releasably connecting it to the safety valve assembly. Manipulation of the wireline actuates means on the paraffin cutting apparatus to open an equalizer port in the tubing string. Paraffin cut from the tubing string wall is removed by flow of production fluids through the open equalizer port. Further manipulation of the wireline actuates means on the paraffin cutting apparatus to release the paraffin cutting apparatus from the safety valve assembly and position the paraffin cutting knives or burrs for removal of paraffin from the wall of the tubing string as the paraffin cutting apparatus is withdrawn from the tubing string by means of the wireline.

REFERENCES:
patent: 2117836 (1938-05-01), Brown
patent: 2205739 (1940-06-01), Wilson
patent: 2636565 (1953-04-01), Williams
patent: 2720925 (1955-10-01), Lynch
patent: 2825411 (1958-03-01), Keltner
patent: 2981331 (1961-04-01), Arterbury
patent: 3016094 (1962-01-01), Abbott
patent: 3072194 (1963-01-01), Winders
patent: 3376936 (1968-04-01), Tomlin
patent: 3394763 (1968-07-01), Page
patent: 3791445 (1974-02-01), True

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