Wells – Processes – Cleaning or unloading well
Patent
1997-11-21
1999-11-02
Dang, Hoang C.
Wells
Processes
Cleaning or unloading well
166 50, 166 771, 166 773, 166384, 175 52, E21B 1922, E21B 3700
Patent
active
059752076
ABSTRACT:
Apparatus and methods for completing deviated and vertical sections of well borehole are disclosed. Drill string in moved into and out of the well borehole in one continuous piece without breaking it into smaller sections. A slotted casing section is attached to the lower end of the drill string and forced to a target production zone by inserting the drill string into the well borehole using a vertical chain drive. Once positioned typically in a production zone, the slotted casing string is disconnected from the drill string and the drill string is removed. Intermediate casing is then positioned in the borehole to extend from the top of the slotted casing string into surface casing, and the intermediate casino string-borehole annulus is cemented.
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patent: 5865249 (1999-02-01), Gipson et al.
patent: 5875850 (1999-03-01), Burge et al.
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