Conocophillips Company

Atlantic Richfield Company

Lamar L Gantt

David D Hearn

John G Eller

Dan E Venhaus

Curtis G Blount

Joseph H Schmidt

Gregory S Walz

David G Hearn

William H Smalstig

Howard Gober

The present invention relates to drilling lateral wells or sidetrack wells from a primary wellbore to enhance the efficiency and productivity of oil and gas wells.

Permanent bypass whipstock assembly for drilling and completing a sidetrack well and preserving access to the original wellbore

A method and apparatus for forming a window in the wall of a tubular wellbore. In one embodiment described herein, a down hole apparatus for forming a window in the wall of a wellbore utilizing a plurality of tubing string sections and a thick tailpipe positioned at the down hole end of a tubing section.

Mill-through tailpipe liner exit and method of use thereof

A mill starting device for use in a pipestring in a wellbore which provides an inclined wall for guiding the mill to a shoulder stop so that when the mill is operated it preferentially bites into the shoulder stop and a method for using the device together with coiled tubing for forming a window in a subsurface well conduit.

Mill starting device and method

Perforation tunnels and other voids or spaces in earth formations in communication with wells are sealed more effectively by injecting and pre-packing resin-coated particulates (sand) into such tunnels or voids and allowing the sand to consolidate to form a substantially rigid, permeable mass. A lead slurry of relatively fine grained cement is then injected to fill the interstices formed in the permeable material occupying the tunnels or voids. A larger or more coarse grain cement is then injected to form a substantially impermeable, rigid filter cake at the interface of the wellbore and the permeable mass to prevent loss of cement slurry out of the tunnels or voids before the cement is set. Vertical and deviated or generally horizontal wellbores having perforation tunnels or voids which suffer unwanted cement drainage prior to setting of conventional oil well cements are more effectively sealed by the sequential injection of the permeable material followed by injection of settable cement slurries.

Squeeze cementing method for wells

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Anchorage, AK, United States of America

Lamar L Gantt