Flow control valve

A pressurized flow control valve assembly connectable to a rotatable drill string and adapted to prevent drainage of fluid from a standpipe and rotary hose of a drilling rig when fluid flow through the drill string in interrupted, the pressurized flow control valve assembly comprising:

• a tubular body member having a first end portion, an opposed second end portion and a fluid flow passage extensive therethrough, the tubular body member defining a valve chamber having an internally disposed shoulder adjacent a downstream end thereof, the first end portion of the tubular body member having internally disposed threads adapted to threadably receive a threaded male portion of a lower kelly valve of the drill string;
• flow control valve means supported within the valve chamber of the tubular body member for controlling fluid flow through the fluid flow passage of the tubular body member, the flow control valve means having an annular pressure cavity such that the flow control valve means selectively opens and closes in response to pressure differential between the annular pressure cavity and the fluid flow passage, the flow control valve means comprising:
• a collapsible sleeve having a first end portion and an opposed second end portion;
• a first sleeve support member adapted to support the first end portion of the collapsible sleeve, the first sleeve support member having a bore extending therethrough, the first sleeve support member adapted to abuttingly engage the internally disposed shoulder in the tubular body member;
• a second sleeve support member spatially disposed from the first sleeve support member and adapted to support the second end portion of the collapsible sleeve such that the collapsible sleeve extends between the first and second sleeve support members, the second sleeve support member having a bore extending therethrough, the second sleeve support member adapted to abuttingly engage the threaded male portion of the lower kelly valve;
• sleeve retaining means for securing the first and second end portions of the collapsible sleeve to the first and second sleeve support members, respectively, such that a fluid-tight seal is formed therebetween;
• a support cylinder having a first end portion, a medial portion and an opposed second end portion, the first end portion connected to the first sleeve support member and the second end portion connected to the second sleeve support member such that the first and second sleeve support members, the collapsible sleeve extending therebetween and the support cylinder are secured in a stable position within the valve chamber of the tubular body member, the medial portion of the support cylinder cooperating with the first and second sleeve support members and the collapsible sleeve to define the annular pressure cavity;
• and
• means for sealing the annular pressure cavity.

A flow control valve for use with a tubular body member having a fluid flow passageway extensive therethrough, the tubular body member connectable to a rotatable drill string, the flow control valve adapted to prevent drainage of a fluid from a stand pipe and rotary hose of a drilling rig via the tubular body member when fluid flow the drill string is interrupted, the flow control valve comprising:

• flow control means supported within the fluid flow passage of the tubular body member for controlling fluid flow therethrough, the flow control means having an annular pressure cavity such that the flow control means is selectively opened and closed in response to pressure differential between the annular pressure cavity and the pressure of fluid flowing through the flow control valve means, the flow control means comprising:
• a collapsible sleeve having a first end portion and an opposed second end portion;
• a first sleeve support member adapted to support the first end portion of the collapsible sleeve, the first sleeve support member having a bore extensive therethrough;
• a second sleeve support member spatially disposed from the first sleeve support member and adapted to support the second end portion of the collapsible sleeve, the second sleeve support member having a bore extensive therethrough, each of the first and second sleeve support members comprising:
• a body portion;
• and
• a mounting hub extending from the body portion such that the bore of each of the first and second sleeve support members extends through the body portion and the mounting hub, the mounting hub defining a retaining surface for supportingly receiving an adjacent end portion of the collapsible sleeve, the mounting hubs of the first and second sleeve support members being disposed so that he retaining surface defined by the mounting hubs are in a facing relationship, the mounting hub of one of the first or second sleeve support members having an access bore openly communicating with the annular pressure cavity, the access bore having a first end portion and a second end portion, the second end portion having a diameter greater than the diameter of the first end portion so that a shoulder is formed at the junction of the first and second end portions of the access bore;
• a support cylinder having a first end portion, a medial portion and an opposed second end portion, the first end portion connected to the first sleeve support member and the second end portion connected tot he second sleeve support member such that the medial portion of the support cylinder is disposed in a covering position over the collapsible sleeve and cooperates with the collapsible sleeve to define the annular pressure cavity therebetween;
• connector means for connecting the first and second sleeve support members to the first and second end portions, respectively, of the support cylinder;
• and
• means for sealing the annular pressure cavity which comprises:
• plug means positionable within the first end portion of the access bore for closing the access bore to gas flow therethrough and for providing a gas-tight seal int he first end portion of the access bore;
• and
• second plug means disposable within the second end portion of the access bore for providing a gas-tight seal in the second end portion of the access bore.

A flow control valve for use with a tubular body member having a fluid flow passageway extensive therethrough, the tubular body member connectable to a rotatable drill string, the flow control valve adapted to prevent drainage of a fluid from a stand pipe and rotary hose of a drilling rig via the tubular body member when fluid flow through the drill string is interrupted, the flow control valve comprising:

• flow control means supported within the fluid flow passageway of the tubular body member for controlling fluid flow therethrough, the flow control means having an annular pressure cavity such that the flow control means is selectively opened and closed in response to pressure differential between the annular pressure cavity and the pressure of fluid flowing through the flow control means, the flow control means comprising:
• a collapsible sleeve having a first end portion and an opposed second end portion;
• a first sleeve support member adapted to support the first end portion of the collapsible sleeve, the first sleeve support member having a bore extensive therethrough and a plurality of gas-venting passageways for establishing fluid communication between the annular pressure cavity and the bore of the first sleeve support member;
• a second sleeve support member spatially disposed from the first sleeve support member and adapted to support the second end portion of the collapsible sleeve, the second sleeve support member having a bore extensive therethrough and an access bore openly communicating with the annular pressure cavity;
• a support cylinder having a first end portion, a medial portion and an opposed second end portion, the first end portion connected to the first sleeve support member and the second end portion connected to the second sleeve support member such that the medial portion of the support cylinder is disposed in a covering position over the collapsible sleeve the medial portion of the support cylinder and the collapsible sleeve cooperating to define the annular pressure cavity therebetween;
• connector means for connecting the first and second sleeve support members to the first and second end portions, respectively, of the support cylinder;
• means disposed within the access bore for sealing the annular pressure cavity so that the annular pressure cavity can be maintained at a desired pressure resulting from pressurization of the annular pressure cavity;
• means for venting pressure form the annular pressure cavity of the flow control valve means, the means for venting pressure being connected to the first sleeve support member and selectively movable between a first position and a second position, in the first position the means for venting pressure from the annular pressure cavity being disposed in a covering position over the gas-venting passageways so that a gas-tight seal is formed therebetween and the gas-venting passageway are effectively closed so that that gas pressure is maintained within the annular pressure cavity, in the second position the means for venting pressure from the annular pressure cavity being disposed in an non-covering position relative to the gas-venting passageways so that the gas pressure in the annular pressure cavity can be vented therethrough.