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Reverse circulation well tool

  • US 10,428,607 B2
  • Filed: 01/29/2016
  • Issued: 10/01/2019
  • Est. Priority Date: 01/29/2016
  • Status: Active Grant
First Claim
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1. A well flow crossover sub comprising:

  • a substantially tubular housing configured to be part of a drill string and disposed in a wellbore, the substantially tubular housing comprising a first flow chamber and a second, separate flow chamber;

    a sealing structure circumscribing a portion of the substantially tubular housing and comprising a sealing element, the sealing element configured to seal against a wellbore wall of the wellbore; and

    a sleeve valve disposed within the substantially tubular housing and selectively movable between a first, closed position and a second, open position in response to a fluid pressure in the first flow chamber or second flow chamber;

    wherein the first flow chamber fluidly connects an annulus of the wellbore uphole of the sealing structure to a central bore of the drill string downhole of the well flow crossover sub, the first flow chamber extending between a first radial port opening at the annulus of the wellbore uphole of the sealing structure proximate a first longitudinal end of the substantially tubular housing and a downhole central bore in the substantially tubular housing at a second, opposite longitudinal end of the substantially tubular housing; and

    wherein the second flow chamber fluidly connects a central bore of the drill string uphole of the sealing structure to the annulus of the wellbore downhole of the sealing structure, the second flow chamber extending between an uphole central bore in the substantially tubular housing at the first longitudinal end and a second radial port opening at the annulus of the wellbore downhole of the sealing structure proximate the second longitudinal end of the substantially tubular housing; and

    the sleeve valve configured to close the second radial port opening in response to the sleeve valve being in the first, closed position and to open the second radial port opening in response to the sleeve valve being in the second, open position.

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