Method and apparatus for washing a horizontal wellbore with coil

Details Method and apparatus for washing a horizontal wellbore with coil Method and apparatus for washing a horizontal wellbore with coil

1997-04-11

1999-02-02

Dang, Hoang C.

Wells

Processes

Cleaning or unloading well

166 50, 166222, E21B 3700

Patent

active

058652493

ABSTRACT:
A method and apparatus for removing solids from a substantially horizontal section of a wellbore which allows the use of coiled tubing as a workstring without requiring the removal of the production tubing from the wellbore. Guide tubing, which is left in the wellbore, extends from the surface through the horizontal section and is adapted to guide a string of slightly smaller-diameter, coiled tubing through the horizontal section. Wash fluid, e.g. water, flows through a nozzle on the coiled tubing and out through openings in the guide tubing directly into the solids to form a slurry therewith. The slurry is then pumped out of the wellbore through the production tubing and/or reenters the guide tubing through other opening(s) therein to flow to the surface through the annulus which exists between the coiled tubing and the guide tubing.

REFERENCES:
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patent: 5400856 (1995-03-01), Schmidt
patent: 5447200 (1995-09-01), Dedora et al.
patent: 5462118 (1995-10-01), Jennings, Jr. et al.
patent: 5607018 (1997-03-01), Schuh
SPE 30269 "Horizontal Well Sand Cleanouts", B.D. Heinrichs et al, Society of Petr. Engr; presented @ Calgary, Alberta, Canada, 19-21 Jun., 1995.

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