Combination landing and float collar
AssigneeDownhole Products Limited
InventorsDarko Arsoski, Douglas Brian Farley
Life of this patent
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Abstract
A combination landing and float collar for use in a wellbore includes: a float valve; a receiver including a plug seat and a ball seat; a tubular housing having a coupling formed at a longitudinal end thereof for assembly as part of a downhole tubular; a first sheath bonding the receiver to an inner surface of the housing within a flow bore thereof; a second sheath bonding the float valve to the inner surface of the housing within the flow bore thereof; a chamber formed in the housing between the first and second sheaths and operable to keep a ball released from the ball seat; and a baffle disposed in the chamber and operable to prevent passage of the ball therethrough.
Claims19
A combination landing and float collar for use in a wellbore, comprising:
- a float valve;
- a receiver comprising a plug seat and a ball seat;
- a tubular housing having a coupling formed at a longitudinal end thereof for assembly as part of a downhole tubular;
- a first sheath bonding the receiver to an inner surface of the housing within a flow bore thereof;
- a second sheath bonding the float valve to the inner surface of the housing within the flow bore thereof;
- a chamber formed in the housing between the first and second sheaths and operable to keep a ball released from the ball seat;
- and
- a baffle disposed in the chamber and operable to prevent passage of the ball therethrough,
- wherein:
- the first sheath is an upper sheath and the second sheath is a lower sheath,
- the collar further comprises a wiper plug having a core and a wiper seal molded on to the core,
- a top of the upper sheath has a tapered inner surface,
- a bottom of the wiper seal is tapered, and
- a tapered fit is formed between the upper sheath and the wiper seal upon landing of the wiper plug on to the plug seat.
A combination landing and float collar for use in a wellbore, comprising:
- a float valve;
- a receiver comprising a plug seat and a ball seat;
- a tubular housing having a coupling formed at a longitudinal end thereof for assembly as part of a downhole tubular;
- a first sheath bonding the receiver to an inner surface of the housing within a flow bore thereof;
- a second sheath bonding the float valve to the inner surface of the housing within the flow bore thereof;
- a chamber formed in the housing between the first and second sheaths and operable to keep a ball released from the ball seat;
- and
- a baffle disposed in the chamber and operable to prevent passage of the ball therethrough,
- wherein:
- the baffle has equalization ports formed through an inner portion thereof and flow ports formed through an outer portion thereof for creating a tortuous flow path from the chamber to the second sheath, and
- each equalization port has a diameter less than one-half of a diameter of the flow ports.
A combination landing and float collar for use in a wellbore, comprising:
- a float valve;
- a receiver comprising a plug seat and a ball seat;
- a tubular housing having a coupling formed at a longitudinal end thereof for assembly as part of a downhole tubular;
- a first sheath bonding the receiver to an inner surface of the housing within a flow bore thereof;
- a second sheath bonding the float valve to the inner surface of the housing within the flow bore thereof;
- a chamber formed in the housing between the first and second sheaths and operable to keep a ball released from the ball seat;
- and
- a baffle disposed in the chamber and operable to prevent passage of the ball therethrough,
- wherein:
- the receiver comprises a tubular body;
- and
- the ball seat is an annular seat:
- disposed within the body,
- connected to the body,
- made of one-piece construction,
- having an upper portion with a non-cylindrical inner surface for receiving the ball, and
- having a blind annular recess extending from an end surface thereof such that an inner fragment of the seat is operable to fracture from an outer portion of the seat in response to a threshold pressure exerted on the ball seated therein, thereby releasing the ball.
Dependencies are inferred from the claim text.