Conocophillips Company

Dan E Venhaus

Curtis G Blount

John G Eller

Lamar L Gantt

John C Braden

David D Hearn

David G Hearn

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 process for isolating one or more segments of a gravel packed well from other segments to treat the isolated segments and easily re-establish flow from the other segments after the treatment is described. The treatment includes techniques for enhancing or permanently blocking production from the isolated segment. The process includes the installation of a removable sealing element and a permeability poison that forms a fluid seal to prevent longitudinal fluid flow along the annular production space outside the tubular production pipe. With wireline or other low-cost wellbore workover systems, access is re-engaged with the secluded formation including removal of plugs and fluid seals within the tubular production pipe.

In-situ zonal isolation and treatment of wells

A process for sealing off one or more segments of a gravel packed well to reduce the production of undesirable fluids. The process includes the installation of a removable plug and the installation of a removable sealant at a location in the gravel packing to separate portions of the formation that produce desirable products from portions that produce less desirable products. A flow poison is then squeezed into the portion of the formation that produces less desirable products. With wireline or other low-cost wellbore workover systems, access is re-engaged with the preferred formation including removal of plugs and sealants without mechanical drilling. The process allows increased production of preferred fluids by preventing less or non preferred fluids from displacing the preferred fluids and also reduces lifting costs that would otherwise be expended for lifting and expenses related to separating and disposing of non preferred fluids.

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Chugiak, AK, United States of America

Dan E Venhaus