A flow control device including a housing having a flow port therein, the flow port including a first end and a second end, a first gate having a specific gravity greater than water disposed in the housing adjacent a first end of the port and movable between a position of nonobstruction of the first end of the port and a position of obstruction of the first end of the port; and a second gate disposed in the housing, the second gate having a specific gravity about the same as a specific gravity of formation water in a formation in which the device is intended to be employed, the second gate disposed to control flow at the second end of the port.

A subsurface safety valve assembly that includes a valve housing comprising a valve seat with a circumference and a seat seal surface. The valve assembly also includes a flapper rotatably connected to the valve housing and comprising a flapper seal surface. The flapper is rotatable into sealing engagement with the seat seal surface in a closed position to form a circumferential surface-to-surface seal. The valve assembly also includes a dovetail groove cut into the seat seal surface or the flapper seal surface and a seal ring held within the dovetail groove and positioned to form a seal against the seal ring when the flapper is in the closed position. The seat seal surface, the flapper seal surface, the dovetail groove, and the seal ring are shaped such that the load on the seal ring is uniform around the seal ring when the flapper is in the closed position.

A subsurface safety valve assembly that includes a valve housing comprising a valve seat with a circumference and a seat seal surface. The valve assembly also includes a flapper rotatably connected to the valve housing and comprising a flapper seal surface. The flapper is rotatable into sealing engagement with the seat seal surface in a closed position to form a circumferential surface-to-surface seal. The valve assembly also includes a dovetail groove cut into the seat seal surface or the flapper seal surface and a seal ring held within the dovetail groove and positioned to form a seal against the seal ring when the flapper is in the closed position. The seat seal surface, the flapper seal surface, the dovetail groove, and the seal ring are shaped such that the load on the seal ring is uniform around the seal ring when the flapper is in the closed position.

Disclosed herein are various embodiments of well control system for drilling an oil or gas well safely and efficiently by providing a mechanical actuator capable of transmitting a rotational force downhole, and converting the rotational force to an axial force for the purpose of operating downhole equipment, including subsurface safety valves, compressible bladder valves, and sliding sleeve valves. Because the actuator is mechanical and not hydraulic as in conventional equipment, the force applied is independent of the depth at which it is applied, overcoming a major deficiency seen in comparable hydraulic systems.

A position-indicating tool includes an outer mandrel that accommodates two or more indicator lugs movable between a first position, where the indicator lugs extend past an outer diameter of the outer mandrel, and a second position, where indicator lugs are radially contracted within the outer diameter, an inner mandrel arranged at least partially within the outer mandrel and providing a radial protrusion that radially supports the indicator lugs in the first position, and a pressure block arranged between the outer and inner mandrels to control a flow of hydraulic fluid between an upper hydraulic chamber and a lower hydraulic chamber, wherein, when a pressure threshold is exceeded in the lower hydraulic chamber, the hydraulic fluid is able to flow into the upper hydraulic chamber and thereby allow the outer mandrel to axially translate with respect to the inner mandrel and move the indicator lugs to the second position.

A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.

The present invention relates to a downhole valve device for providing access to a hydrocarbon reservoir, comprising a tubular element having a wall, an inner face and an outer face, the tubular element having a first through-bore and a plurality of second through-bores in the wall extending from the inner face to the outer face, and a sleeve abutting the inner face and being displaceable along the inner face between a first state in which the sleeve covers the first and second through-bores and a second state in which the sleeve uncovers the first and second through-bores, wherein a burst element is arranged in the first through-bore and an acid-dissolvable plug is arranged in each second through-bore. Moreover, the present invention also relates to a downhole completion system for completing a well in low pressure zone and a downhole completion method for completing a well.

A technique facilitates control over fluid flow via controlled operation of an injection valve. The technique enables control over operation of the injection valve in a variety of subsurface applications. The injection valve comprises a flapper which may be selectively shifted to and held in an open position. Depending on the operational configuration of the injection valve, the flapper may be shifted to the open position via fluid flow along a primary flow passage. However, the injection valve also may be shifted to the open position via a separate actuator controllable via pressure applied independently of fluid flow along the primary flow passage.

A technique facilitates control over fluid flow via controlled operation of an injection valve. The technique enables control over operation of the injection valve in a variety of subsurface applications. The injection valve comprises a flapper which may be selectively shifted to and held in an open position. Depending on the operational configuration of the injection valve, the flapper may be shifted to the open position via fluid flow along a primary flow passage. However, the injection valve also may be shifted to the open position via a separate actuator controllable via pressure applied independently of fluid flow along the primary flow passage.

An apparatus having a shock-absorbing sleeve is disclosed. The apparatus comprises a housing, an axially moveable sleeve received in the housing and a sealed annular space having a fixed volume axially between the housing and the sleeve. A barrier axially moveable with the sleeve divides the annular space into a first and a second chambers. The first and second chambers are filled with uncompressible dampening fluid. One or more metering passages across the barrier fluidly connect the first and chambers. During the axial movement of the sleeve, the volume of the first chamber is reduced and that of the second chamber is increased, forcing the fluid in the first chamber to flow into the second chamber in a controlled manner to dampen the movement of the sleeve.