Inventor
SPROUL RICHARD M
US7 patents
Patents
7 patentsUS4813481AMar 21, 1989
Expendable flapper valve
OTIS ENG CO113 citations94
US4930573AJun 5, 1990
Dual hydraulic set packer
OTIS ENG CO114 citations93
US4846281AJul 11, 1989
Dual flapper valve assembly
OTIS ENG CO90 citations93
US4671354AJun 9, 1987
Well packer
OTIS ENG CO45 citations91
US5113939AMay 19, 1992
Single bore packer with dual flow conversion for gas lift completion
OTIS ENG CO37 citations90
US5048610ASep 17, 1991
Single bore packer with dual flow conversion for gas lift completion
OTIS ENG CO54 citations90
US4832129AMay 23, 1989
Multi-position tool and method for running and setting a packer
OTIS ENG CO44 citations89