Injection device
OwnerKeith Donald Woodfordinventor
Life of this patent
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Abstract
An injection device for use in injecting a fluid into a target location comprises a housing and a valve assembly located within the housing. The housing defines an inlet for communicating with an injection line, an outlet for communicating with a target location, and an injection fluid flow path extending between the inlet and outlet. The valve assembly located is configured to control the flow of injection fluid along the flow path and comprises first and second valve members both arranged to move within the housing, wherein in an open configuration to permit flow the first and second members are disengaged, and in a closed configuration to prevent flow the first and second members are engaged and the first valve member is biased against the second member by inlet fluid pressure to assist sealing therebetween.
Claims25
An injection device for use in injecting a fluid into a downhole target location, comprising:
- a housing defining an inlet for communicating with an injection line, an outlet for communicating with a downhole target location, and an injection fluid flow path extending between the inlet and outlet;
- a valve assembly located within the housing and configured to control the flow of injection fluid along the flow path, the valve assembly comprising first and second valve members both arranged to move within the housing;
- a limiting arrangement configured to limit or restrict movement of the first valve member, the limiting arrangement including a limiting feature fixed relative to the housing and a corresponding limiting feature fixed relative to the first valve member;
- wherein, in an open configuration to flow, the first and second valve members are disengaged, and in a closed configuration to prevent flow, the first and second valve members are engaged and the corresponding limiting features are of the limiting arrangement are separated such that the first valve member is biased against the second valve member by inlet fluid pressure to assist sealing therebetween.
A method of controlling injection flow through an injection device between an injection line and a downhole target location, wherein the injection device includes a housing defining a flow path extending between an inlet and an outlet and a valve assembly comprising first and second moveable valve members located within the housing, the method comprising:
- disengaging the first and second valve members to permit flow along the flow path;
- engaging the first and second valve members to prevent flow;
- biasing the first valve member against the second valve member when engaged therewith with inlet fluid pressure to assist sealing between said members;
- and
- defining a restriction to flow when the first and second valve members are disengaged to establish a back pressure in the inlet side assisting to maintain the inlet pressure above the outlet pressure.
An injection device for use in injecting a fluid into a downhole target location, comprising:
- a housing defining an inlet for communicating with an injection line, an outlet for communicating with a downhole target location, and an injection fluid flow path extending between the inlet and outlet;
- and
- a valve assembly located within the housing and configured to control the flow of injection fluid along the flow path,
- wherein the valve assembly comprises first and second valve members configured to be engaged at a seal area to prevent flow and disengaged to permit flow, wherein at least one of the valve members defines a piston arrangement provided separately from the region of engagement between the first and second valve members and configured to be actuated by fluid pressure to move at least one of said valve members;
- a limiting arrangement including a limiting feature fixed relative to the housing and a corresponding limiting feature fixed relative to the first valve member;
- and
- wherein, when the first and second valve members are engaged to prevent flow, the corresponding limiting features are separated such that inlet fluid pressure acts over the seal area, thus forcing the first and second valve members together to assist sealing therebetween.
Dependencies are inferred from the claim text.