Shell Oil Comapny

Simon Lawrence Fisher

Francis Alexander Cumming

Johannis Josephus Den Boer

Wilhelmus Christianus Maria Lohbeck

Robert Bruce Stewart

John Foreman Stewart

Anthony Evert Kuperij

There is provided a multilateral well and electric transmission system comprising a branch well tubular in a branch wellbore which is connected in an electrically conductive manner to a primary well tubular in a primary wellbore such that the primary and branch well tubulars form a link for transmission of electrical power and/or signals between the primary and branch wellbores. Low voltage electrical power can be transmitted from the surface to a battery in the branch wellbore to trickle-charge the battery and signals from battery-actuated measuring and control equipment in the branch wellbore can be transmitted back to surface via the walls of the electrically interconnected primary and branch well tubulars.

Multilateral well and electrical transmission system

A system for sealing the intersection between a primary borehole and a branch borehole comprises a primary casing section located in the primary borehole in the region of the branchpoint, and a branch casing section located in the branch borehole and secured to the primary casing section. The primary casing section is tubular and defines a slant surface which intersects a central axis of the primary casing section at an acute angle, so that the primary casing section can be pressed towards the branchpoint by means of a hollow whipstock or other wedge-shaped element.

System for sealing the intersection between a primary and a branch borehole

A method is provided for creating zonal isolation between the exterior and interior of an uncased section of an underground well system which is located adjacent to a well section in which a well casing is present. The method includes inserting an expandable tubular through the existing well casing into an uncased section, such as a lateral branch, of the underground well system and subsequently expanding the expandable tubular such that the one end is pressed towards the wall of the uncased section of the well system and the outer surface of the other end is pressed against the inner surface of the well casing thereby creating an interference fit capable of achieving a shear bond and a hydraulic seal between the surrounding surfaces.

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Rijswijk, Netherlands

Simon Lawrence Fisher