REVERSE CIRCULATION WELL TOOL
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A crossover sub includes a tubular housing connected to a drill string in a wellbore, a sealing structure to seal against a wellbore wall, and a sleeve valve disposed within the housing and movable between a closed position and an open position in response to a fluid pressure in a first flow chamber or second, separate flow chamber of the housing. The first flow chamber fluidly connects an upper annulus of the wellbore to a central bore of the drill string downhole of the crossover sub. The second flow chamber fluidly connects a central bore of the drill string uphole of the sealing structure to a lower annulus of the wellbore. The sleeve valve closes the second flow chamber in response to the sleeve valve being in the closed position, and opens the second flow chamber in response to the sleeve valve being in the open position.
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Citations
21 Claims
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1. A well flow crossover sub comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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receiving, in a first flow chamber of a well crossover sub of a drill string disposed in a wellbore, a fluid pressure greater than a threshold fluid pressure from a fluid in an annulus of the wellbore, the fluid pressure acting on a sleeve valve of the well crossover sub, the well crossover sub comprising a substantially tubular housing comprising the first flow chamber and a second flow chamber, the sleeve valve, and a sealing structure circumscribing a portion of the substantially tubular housing, wherein the first flow chamber fluidly connects the annulus of the wellbore uphole of the sealing structure to a central bore of the drill string downhole of the well flow crossover sub, 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; moving, in response to receiving the fluid pressure greater than the threshold fluid pressure, the sleeve valve from a first, closed position restricting fluid flow through the second flow chamber to a second, open position allowing fluid flow through the second flow chamber; flowing a first fluid from the annulus uphole of the sealing structure to the central bore of the drill string downhole of the well crossover sub through the first flow chamber; and flowing a second fluid from the annulus downhole of the sealing structure to the central bore of the drill string uphole of the sealing structure through the second flow chamber. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A well tool, comprising:
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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; 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 the second flow chamber; wherein the first flow chamber fluidly connects an annulus of the wellbore uphole of the well tool to a central bore of the drill string downhole of the well tool, the first flow chamber extending between a first plurality of radial port openings proximate a first longitudinal end of the substantially tubular housing and a downhole central bore of the substantially tubular housing at a second, opposite longitudinal end of the substantially tubular housing; wherein the second flow chamber fluidly connects a central bore of the drill string uphole of the well tool to the annulus of the wellbore downhole of well tool, the second flow chamber extending between an uphole central bore in the substantially tubular housing at the first longitudinal end and a second plurality of radial port openings proximate the second longitudinal end of the substantially tubular housing; and wherein the sleeve valve configured to close the second radial port opening when the sleeve valve is in the first, closed position and to open the second radial port opening when the sleeve valve is in the second, open position.
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Specification