초록 ▼

The present invention generally relates to a non-elastomeric cement through tubing retrievable safety valve configured to control fluid flow through a production tubing string. In one aspect, a valve for use in a wellbore is provided. The valve includes a tubular body. The valve further includes a f

The present invention generally relates to a non-elastomeric cement through tubing retrievable safety valve configured to control fluid flow through a production tubing string. In one aspect, a valve for use in a wellbore is provided. The valve includes a tubular body. The valve further includes a flow tube having a bore therethrough, wherein the flow tube is disposed in the tubular body to form an annular area therebetween. The valve further includes a flapper movable between an open position and a closed position in response to the movement of the flow tube. Additionally, the valve includes a sealing system constructed and arranged to substantially isolate the annular area from the bore, thereby substantially eliminating the potential of contaminants in the bore from entering into the annular area. In another aspect, a method of controlling fluid in a wellbore is provided.

대표청구항 ▼

The invention claimed is: 1. A valve for use in a wellbore, the valve comprising: a tubular body; a flow tube having a bore therethrough, the flow tube disposed in the tubular body to form an annular area therebetween; a stationary sleeve disposed in the tubular body, wherein the stationary sleeve

The invention claimed is: 1. A valve for use in a wellbore, the valve comprising: a tubular body; a flow tube having a bore therethrough, the flow tube disposed in the tubular body to form an annular area therebetween; a stationary sleeve disposed in the tubular body, wherein the stationary sleeve is coaxially arranged relative to the flow tube and wherein a portion of the flow tube is configured to move along an outer surface of the stationary sleeve; a flapper movable between an open position and a closed position in response to movement of the flow tube; a sealing system disposed between the flow tube and the stationary sleeve, the sealing system configured to substantially isolate the annular area from the bore, thereby substantially eliminating the potential of contaminants in the bore from entering into the annular area; and a second sealing system that is formed when an end of the flow tube directly lands on a shoulder of the tubular body when the flapper is in the open position. 2. The valve of claim 1, wherein the sealing system is operatively attached to the flow tube and moveable therewith. 3. The valve of claim 1, wherein the sealing system includes a seal member disposed between the flow tube and the stationary sleeve. 4. The valve of claim 3, wherein the seal member is made from PTFE. 5. The valve of claim 1, wherein the end of the flow tube includes a formed surface for mating and forming a seal with the shoulder of the tubular body. 6. The valve of claim 1, further including a piston disposed in the annular area, wherein the piston acts against a biasing member to shift the flow tube to the open position in response to hydraulic pressure. 7. The valve of claim 6, wherein the biasing member is disposed in the annular area. 8. The valve of claim 1, wherein the tubular body includes a lower sub, whereby the shoulder is formed on a portion of the lower sub. 9. A downhole valve for use in a wellbore, the valve comprising: a tubular body; a movable flow tube having a bore therethrough, the flow tube disposed in the tubular body to form a first annular area and a second annular area therebetween; a stationary sleeve disposed in the tubular body, wherein the stationary sleeve is coaxially arranged relative to the flow tube and wherein a portion of the flow tube moves along an outer diameter of the stationary sleeve; a flapper movable between an open position and a closed position, whereby in the closed position the flapper is substantially within the second annular area; a first sealing system disposed between the flow tube and the stationary sleeve and configured for substantially isolating the first annular area from contaminates in the bore; and a second sealing system for substantially isolating the second annular area from contaminates in the bore, wherein the second sealing system is formed when an end of the flow tube directly lands on a shoulder of the tubular body. 10. The valve of claim 9, wherein the first sealing system includes a seal member disposed between the flow tube and the stationary sleeve. 11. The valve of claim 9, wherein the end of the flow tube includes a formed surface for mating and forming a seal with the shoulder of the tubular body. 12. The valve of claim 9, wherein the tubular body includes a lower sub, whereby the shoulder is formed on a portion of the lower sub. 13. The valve of claim 9, wherein the first sealing system includes a seal member that is attached to the portion of the flow tube that moves along the stationary sleeve. 14. A method of controlling fluid in a wellbore, comprising: positioning in the wellbore a string of production tubing and a valve, the valve comprising: a tubular body; a flow tube having a bore therethrough, the flow tube disposed in the tubular body to form an annular area therebetween; a stationary sleeve disposed in the tubular body; a flapper movable between an open position and a closed position; and a sealing system; opening the flapper in response to movement of the flow tube, wherein a portion of the flow tube moves along an outer surface of the stationary sleeve; forming a seal as an end of the flow tube directly lands on a shoulder of the tubular body when the flapper is in the open position; pumping cement through a bore of the production tubing and the bore of the flow tube; and substantially isolating the annular area from the cement pumped through the valve. 15. The method of claim 14, further including providing fluid isolation between the bore of the flow tube and a selected formation in the wellbore. 16. The method of claim 14, wherein the sealing system includes a seal member disposed between the flow tube and the stationary sleeve.