CPC E21B 31/16 (2013.01) [E21B 21/103 (2013.01); E21B 31/20 (2013.01); E21B 29/005 (2013.01)] | 17 Claims |
7. A method for controlling fluid flow between a first tool and a second tool in a tool string lowered from the surface into a cased wellbore, the cased wellbore having a first wellbore casing and a second wellbore casing of a smaller diameter than the first wellbore casing, the second wellbore casing having an upper end terminating inside the first casing; the method comprising:
flowing a fluid from the surface under pressure to the tool string, the tool string further comprising a valve between a first tool and a second tool, the valve comprising,
an external housing with upper and lower ends for connecting with and forming part of the tool string, the valve being configured for the fluid from the surface to be received through the upper end of the external housing and to exit the valve through the lower end of the external housing, the valve being further configured to have a plurality of fluid control states, each of the plurality of fluid control states corresponding to a plurality of different rates of fluid flow exiting the lower end of the external housing, the plurality of fluid control states including at least a first control state and a second control state; and
at least one control member, the at least one control member extending beyond an outer diameter of the housing under the influence of a biasing force and being configured to move with respect to the external housing when the valve moves past the upper end of the second wellbore casing, wherein the valve is configured for the movement of the at least one moveable control member to actuate the valve to change the fluid flow existing the lower end of the housing,
lowering the tool string past the upper end of the second wellbore casing to cause the control member to move and thereby change the valve between the first fluid control state to the second fluid control state.
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