Flow completion system

A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:

• a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore;
• a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string;
• a first closure member which is positioned in the production bore above the production passageway;
• a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway;
• wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment;
• a second closure member which is positioned in the production bore above the first closure member;
• a second annular seal which is positioned between the tubing hanger and the central bore above the first seal;
• wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment;
• wherein both the first and the second barriers are associated with the tubing hanger;
• an annulus bore which extends generally axially through the tubing hanger between the tubing annulus and a portion of the central bore that is located above the second seal;
• and
• an annulus closure member which is positioned in the annulus bore;
• wherein the tubing spool comprises an annulus outlet and an annulus passageway which extends between the tubing annulus and the annulus outlet.

A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:

• a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore;
• a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string;
• a first closure member which is positioned in the production bore above the production passageway;
• a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway;
• wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment;
• a second closure member which is positioned in the production bore above the first closure member;
• a second annular seal which is positioned between the tubing hanger and the central bore above the first seal;
• wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment;
• wherein both the first and the second barriers are associated with the tubing hanger;
• wherein the second annular seal comprises a metal seal;
• and
• a seal ring which is positioned between the second annular seal and the tubing hanger.

A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:

• a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore;
• a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string;
• a first closure member which is positioned in the production bore above the production passageway;
• a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway;
• wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment;
• a second closure member which is positioned in the production bore above the first closure member;
• and
• a second annular seal which is positioned between the tubing hanger and the central bore above the first seal;
• wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment;
• wherein both the first and the second barriers are associated with the tubing hanger;
• and
• wherein the tubing hanger comprises at least two service and control conduits which each extend through the tubing hanger to the tubing annulus.

A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:

• a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore;
• a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string;
• a first closure member which is positioned in the production bore above the production passageway;
• a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway;
• wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment;
• a second closure member which is positioned in the production bore above the first closure member;
• a second annular seal which is positioned between the tubing hanger and the central bore above the first seal;
• wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment;
• and
• wherein both the first and the second barriers are associated with the tubing hanger;
• an annulus bore which extends generally axially through the tubing hanger between the tubing annulus and a portion of the central bore that is located above the second seal;
• a first annulus closure member which is positioned in the annulus bore;
• and
• a second annulus closure member which is positioned in the annulus bore.

A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:

• a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore;
• a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string;
• a first closure member which is positioned in the production bore above the production passageway;
• a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway;
• wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment;
• a second closure member which is positioned in the production bore above the first closure member;
• a second annular seal which is positioned between the tubing hanger and the central bore above the first seal;
• wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment;
• wherein both the first and the second barriers are associated with the tubing hanger;
• a tubing hanger running tool which is removably connectable to the top of the tubing hanger and which includes a production port that communicates with the production bore and an annulus port that communicates with the tubing annulus;
• wherein the tubing spool comprises an annulus passageway that communicates with the tubing annulus and a workover passageway that extends between the annulus passageway and the central bore;
• wherein the annulus port communicates with the tubing annulus through the workover passageway and the annulus passageway;
• a BOP which is removably connectable to the top of the tubing spool and which includes a BOP bore and at least one choke and kill line that communicates with the BOP bore;
• wherein the annulus port communicates with the BOP bore;
• whereby fluid communication between the tubing annulus and the BOP choke and kill line may be established through the BOP bore, the annulus port, the workover passageway and the annulus passageway.

A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising:

• a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore;
• a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string;
• a first closure member which is positioned in the production bore above the production passageway;
• a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway;
• wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment;
• a second closure member which is positioned in the production bore above the first closure member;
• a second annular seal which is positioned between the tubing hanger and the central bore above the first seal;
• wherein the second closure member and the second seal comprise a second pressure-containing barrier between the well bore and the environment;
• wherein both the first and the second barriers are associated with the tubing hanger;
• a tubing hanger running tool which Is removably connectable to the top of the tubing hanger and which includes a production port that communicates with the production bore and an annulus port that communicates with the tubing annulus;
• wherein the tubing hanger comprises an annulus bore that communicates with the tubing annulus;
• wherein the annulus port communicates with the tubing annulus through the annulus bore;
• a BOP which is removably connectable to the top of the tubing spoof and which includes a BOP bore and at least one choke and kill line that communicates with the BOP bore;
• wherein the annulus port communicates with the BOP bore;
• whereby fluid communication between the tubing annulus and the BOP choke and kill line may be established through the BOP bore, the annulus port and the annulus bore.