3876000 is referenced by 42 patents and cites 5 patents.

In accordance with an illustrative embodiment of the present invention, a drill stem testing apparatus that utilizes inflatable packer elements to isolate an interval of the borehole includes a uniquely arranged pump that is adapted to supply fluids under pressure to the elements in response to upward and downward movements of the pipe string extending to the surface. The pump includes an inner body structure connected to the packing elements and a telescopically disposed outer housing structure connected to the pipe string, said structures defining a working volume into which well fluids are drawn during downward movement, and from which fluids under pressure are exhausted and supplied to the packing elements during upward movement, the intake passages to the pump being backflushed during each upward movement to prevent clogging by debris in the well fluids. Uniquely arranged pressure equalizing and packer element deflating valve apparatus also is disclosed herein.

Title
Inflatable packer drill stem testing apparatus
Application Number
05/410,945
Publication Number
3876000
Application Date
October 29, 1973
Publication Date
April 8, 1975
Inventor
Nutter Benjamin P
Agent
Moore Stewart F
Sherman William R
Moseley David L
Assignee
Schlumberger Technology Corporation
IPC
E21b 33/127
E21b 43/00
E21B 33/124
E21B 33/12
E21B 49/00
E21B 49/08
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