IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0650499
(2009-12-30)
|
| 등록번호 |
US-8651188
(2014-02-18)
|
|
발명자
/ 주소 |
- Scarsdale, Kevin T.
- Kamphaus, Jason
- Hahn, Jacob
- White, Thomas M.
|
| 출원인 / 주소 |
- Schlumberger Technology Corporation
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
0 인용 특허 :
46 |
초록
▼
A gas lift valve that has a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet, and a flow tube located inside the body. The flow tube is translatable in the axial direction between at least a first and a second position. A ven
A gas lift valve that has a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet, and a flow tube located inside the body. The flow tube is translatable in the axial direction between at least a first and a second position. A venturi orifice located inside the body along the flow path. A seal part is located proximate to the outlet of the body. A flapper is connected with the body by way of a hinge part and the flapper has at least a first open position and a second closed position. The closed position is where the flapper contacts the seal thereby closing the flowpath and the second closed position is where the flapper does not contact the seal and does not close the flowpath.
대표청구항
▼
1. A gas lift valve, comprising: a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet;a flow tube located inside the body, the flow tube being translatable in the axial direction between at least a first and a second position w
1. A gas lift valve, comprising: a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet;a flow tube located inside the body, the flow tube being translatable in the axial direction between at least a first and a second position wherein the flow tube comprises a first end, a second end and a blunt body located at the second end;a venturi flow restrictor that comprises a venturi orifice, the venturi flow restrictor located inside the body along the flow path and disposed at least partially within the flow tube via an opening of the first end of the flow tube;a seal part located proximate to the outlet of the body;a flapper connected with the body by way of a hinge part, the flapper having at least a first position being an open position and a second position being a closed position, the closed position being where the flapper contacts the seal part thereby closing the flow path and the open position being where the flapper does not contact the seal part and does not close the flow path, a transition from the closed position to the open position occurring in response to flow in the flow path impinging the blunt body to transfer force to the flow tube to contact the flapper and to force the flapper to the open position wherein where the flow tube is in its second position, the second end, the blunt body and a portion of the flow tube extends through an opening defined by the seal part, the portion shielding the seal part from flow along the flow path. 2. The gas lift valve of claim 1, wherein the seal part comprises at least three distinct components that comprise a first component that comprises a hard metal seat;a second component, concentric to the first component, that comprises a seat that comprises polytetrafluoroethylene (PTFE) or polyetheretherketone (PEEK); anda third component, concentric to the second component, that comprises an elastomeric seat. 3. The gas lift valve of claim 2, wherein at a first pressure differential across the flapper, the elastomeric seat forms a primary seal;at a second pressure differential across the flapper that is larger than the first pressure differential, the elastomeric seat is fully compressed and the PTFE or PEEK seat forms a primary seal; andat a third pressure differential across the flapper that is higher than both the first pressure differential and the second pressure differential, both the elastomeric seat and the PTFE or PEEK seat are compressed so that the hard metal seat contacts the flapper thereby forming a primary seal. 4. The gas lift valve of claim 3, wherein the elastomeric seat extends a distance, the PTFE or PEEK seat extends a distance less than the elastomeric seat, and the hard metal seat extends a distance less than either the elastomeric seat or the PTFE or PEEK seat. 5. The gas lift valve of claim 3, wherein the first pressure differential is zero. 6. The gas lift valve of claim 1, wherein a spring is located between the flow tube and the body, the spring exerting a force on the flow tube thereby biasing the flow tube into its first position. 7. The gas lift valve of claim 6, comprising a pressure conduit from outside the gas lift valve to a pressure chamber inside the body and adjacent to the flow tube, whereby increased pressure in the pressure chamber biases the flow tube toward its second position against the biasing force of the spring. 8. The gas lift valve of claim 6, wherein a pressure conduit extends through the venturi orifice. 9. The gas lift valve of claim 1, wherein the gas lift valve is adapted to fit into a side pocket mandrel in production tubing of a subterranean hydrocarbon well. 10. The gas lift valve of claim 1, wherein the hinge part has a spring element that biases the flapper toward a closed position. 11. The gas lift valve of claim 1, wherein at least one elastic element is located between the seal part and the body to provide elastic deformation responsive to force applied to the seal part by the flapper part in the closed position. 12. The gas lift valve of claim 1 wherein the seal part comprises at least three distinct components that comprise a hard metal component,a softer elastomeric component, andone or more elastic element components that contact and support the hard metal component to help align the hard metal component when the flapper is in the closed position. 13. The gas lift valve of claim 12 wherein the one or more elastic element components comprise O-rings. 14. The gas lift valve of claim 12 wherein the flapper contacts the softer elastomeric component when the flapper is in the closed position at a first pressure differential across the flapper and wherein the flapper contacts the hard metal component when the flapper is in the closed position at a second pressure differential across the flapper that exceeds the first pressure differential across the flapper. 15. A method of sealing a one way gas lift flapper valve seal, comprising: locating a gas lift valve downhole in a side pocket mandrel of a production tube of a subterranean hydrocarbon well, the gas lift valve comprising a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet;a flow tube located inside the body, the flow tube being translatable in the axial direction between at least a first and a second position wherein the flow tube comprises a first end, a second end and a blunt body located at the second end;a venturi flow restrictor that comprises a venturi orifice, the venturi flow restrictor located inside the body along the flow path and disposed at least partially within the flow tube via an opening of the first end of the flow tube;a seal part located proximate to the outlet of the body; anda flapper connected with the body by way of a hinge part, the flapper having at least a first position being an open position and a second position being a closed position, the closed position being where the flapper contacts the seal part thereby closing the flow path and the open position being where the flapper does not contact the seal part and does not close the flow path, a transition from the closed position to the open position occurring in response to flow in the flow path impinging the blunt body to transfer force to the flow tube to contact the flapper and to force the flapper to the open position wherein where the flow tube is in its second position, the second end, the blunt body and a portion of the flow tube extends through an opening defined by the seal part, the portion shielding the seal part from flow along the flow path. 16. The method of claim 15, wherein a pressure differential is applied across the flapper in the closed position. 17. The method of claim 15 wherein the seal part comprising at least three distinct components that comprise a first component being a hard metal seat,a second component, concentric to the first component, being a seat that comprises polytetrafluoroethylene (PTFE) or polyetheretherketone (PEEK), anda third component, concentric to the second component, being an elastomeric seat.
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