Drainhole well completion
This patent describes a method for completing a curved drainhole wellbore defined by a wall formed by drilling into at least one subsurface geologic formation. The improvement comprises inserting into the drainhole wellbore a casing string composed of alternating casing subs and external casing packer subs, each of the casing subs being solid and not perforated when the casing string is inserted into the wellbore, each of the external casing packer subs carrying an elastic member adapted to expand away from the casing packer sub toward and into contact with the adjacent wall of the drainhole wellbore, whereby, except for the end most casing sub, each of the closing sub carries first and second external casing packer subs on either end thereof so that upon expansion of the elastic members carried by the first and second external casing packer subs the intermediate casing sub is isolated in the annulus outside the casing string assembly and inside the drainhole wellbore. The packer subs are activated by pumping an activating fluid into the casing string to expand essentially all elastic members on the casing string at essentially the same time by expanding the elastic member into contact with the drainhole wellbore wall thereby to form isolated zones along the casing string. The isolated zones extend from outside the casing string to the drainhole wellbore wall, and thereafter perforate at least one of the solid casing subs to establish fluid flow contact between the interior of the casing string and the geologic formation.
- Assignee:
- Atlantic Richfield Co., Los Angeles, CA
- Patent Number(s):
- US 4714117
- OSTI ID:
- 5394238
- Resource Relation:
- Patent File Date: Filed date 20 Apr 1987
- Country of Publication:
- United States
- Language:
- English
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