IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0072725
(2008-02-28)
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등록번호 |
US-7703536
(2010-05-20)
|
발명자
/ 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
6 |
초록
▼
A gas lift system for use in marginal well and small diameter production tubing is disclosed. The system uses compressed natural (produced) gas to lift formation fluids thereby enhancing produced gas. Incorporated in the system is a plurality of differential pressure control valves which provide the
A gas lift system for use in marginal well and small diameter production tubing is disclosed. The system uses compressed natural (produced) gas to lift formation fluids thereby enhancing produced gas. Incorporated in the system is a plurality of differential pressure control valves which provide the required lift capability for a standard jet pump, located at the bottom of the wellbore, to continue to lift produced fluids. The methods of use are described.
대표청구항
▼
The invention claimed is: 1. I claim a gas lift system comprising; a lift tube having an inside, an outside, a top end and a distal end being placed within a production string said top end in communication with a recovery system; a plurality of differential pressure control valves each having the s
The invention claimed is: 1. I claim a gas lift system comprising; a lift tube having an inside, an outside, a top end and a distal end being placed within a production string said top end in communication with a recovery system; a plurality of differential pressure control valves each having the same differential operation pressure adapted to be attached to said lift tube such that said inside of said lift tube is in communication with said production string through each of said differential pressure control valves and wherein fluid contained within said production string may freely pass into said lift tube through each of said differential pressure control valves when open and such that each of said differential control valves will close whenever the decreasing pressure within said lift tube approaches the pressure within said production string; a jet pump attached to the distal end of said lift tube said jet pump adapted to lift liquids up said lift tube whenever gas is applied therewith; and a source of pressured gas applied to said production string. 2. The Gas Lift System of claim 1 wherein said lift tube is coiled tubing. 3. I claim a gas lift system comprising; a lift tube having an inside, an outside, a top end and a distal end being placed within an annulus with said top end in communication with a recovery system; a plurality of differential pressure control valves each having the same differential operation pressure adapted to be attached to said lift tube such that said inside of said lift tube is in communication with said annulus through each of said differential pressure control valves and wherein fluid contained within said annulus may freely pass into said lift tube through each of said differential pressure control valves when open and such that each of said differential control valves will close whenever the decreasing pressure within said lift tube approaches the pressure within said annulus; a jet pump attached to the distal end of said lift tube said jet pump adapted to lift liquids up said lift tube whenever gas is applied therewith; and a source of pressured gas applied to said annulus. 4. The Gas Lift System of claim 3 wherein said lift tube is coiled tubing. 5. I claim a differential pressure control valve for use with a gas lift system comprising a body having an inside, an outside, topside and a bottom side; an upper and lower conduit in communication with said inside of said body; a shuttle contained within said body and adapted to move between said topside and said bottom side thereof; a bias spring contained within said body between said shuttle and said bottom side of said body; wherein said differential pressure control valve has an open position and a closed position, and wherein said open position allows fluid to flow from said topside of said body through said differential pressure control valve and through said upper conduit and wherein said closed position inhibits said flow and wherein said differential pressure control valve shifts to said closed position whenever the differential pressure between said topside and said lower conduit becomes nearly equal. 6. I claim a dual differential pressure control valve comprising: a first body having a first inside, a first outside, a first topside adapted to receive fluid flow and a first bottom side; a first upper and first lower conduit in communication with said first inside of said first body; a first shuttle contained within said first body and adapted to move between said first topside and said first bottom side thereof; a first bias spring contained within said first body between said first shuttle and said first bottom side of said first body; a second body having a second inside, a second outside, a second topside and a second bottom side adapted to receive fluid flow; a second upper and second lower conduit in communication with said second inside of said second body; a second shuttle contained within said second body and adapted to move between said second topside and said second bottom side thereof; a second bias spring contained within said second body between said second shuttle and said second bottom side of said second body; wherein said first bottom of said first body is conjoined to said second top of said second body and wherein said dual differential pressure control valve has a first open position and a first closed position associated with said first body and a second open position and a second closed position associated with said second body, and wherein said first open position allows fluid to flow from said first topside of said first body through said differential pressure control valve and through said first upper conduit and wherein said closed position inhibits said flow and further wherein said differential pressure control valve shifts to said closed position whenever the differential pressure between said first topside and said first lower conduit becomes nearly equal and wherein said second open position allows fluid to flow from said second bottom side of said second body through said differential pressure control valve and through said second lower conduit and wherein said closed position inhibits said flow and further wherein said differential pressure control valve shifts to said closed position whenever the differential pressure between said second bottom side and said second upper conduit becomes nearly equal. 7. I claim a method for operating a gas lift system in a well having a wellhead, a casing, a production string within the casing and having a lift tube with a series of differential pressure control valves each having the same differential operation pressure placed within the production string and terminated at its distal end in an eduction pump and wherein the differential pressure control valves communicate between the lift tube and the fluid contained within the production string and wherein the lift tube is in communication with a recovery system and having a source of pressured gas comprising: a. applying pressured gas to the production string; b. allowing the pressured gas to force liquid from the production string through the first differential pressure control valve nearest the wellhead to the recovery system; c. waiting until the first differential pressure control valve closes; d. allowing the pressured gas to force liquid from the production string through the next differential pressure control valve nearest the wellhead to the recovery system; e. waiting until the next differential pressure control valve closes; f. repeating steps d and e until the last differential pressure control valve at the opposite end of the production string from the wellhead closes; and, g. producing the well through the eduction pump utilizing the pressured gas as a lift medium through the lift tube and to the recovery system. 8. I claim a method for operating a gas lift system in a well having a wellhead, a casing, and having a lift tube with a series of differential pressure control valves each having the same differential operation pressure placed within the casing and terminated at its distal end in an eduction pump and wherein the differential pressure control valves communicate between the lift tube and the fluid contained within the casing and wherein the lift tube is in communication with a recovery system and having a source of pressured gas comprising: a. applying pressured gas to the casing: b. allowing the pressured gas to force liquid from the casing through the first differential pressure control valve nearest the wellhead to the recovery system; c. waiting until the first differential pressure control valve closes; d. allowing the pressured gas to force liquid from the casing through the next differential pressure control valve nearest the wellhead to the recovery system; e. waiting until the next differential pressure control valve closes; d. repeating steps d and e until the last differential pressure control valve at the opposite end of the lift tube from the wellhead closes; and, e. producing the well through the eduction pump utilizing the pressured gas as a lift medium through the lift tube and to the recovery system. 9. I claim a method for reverse flushing a gas lift system in a well having a wellhead, surface plumbing, a casing, a production string within the casing and having a lift tube with a series of differential pressure control valves placed within the production string and terminated at its distal end in an eduction pump wherein the eduction pump has a check valve in the inlet and wherein the differential pressure control valves communicate between the lift tube and the fluid contained within the production string and wherein the lift tube is in communication with a recovery system which normally receives gas from the wellhead through the surface plumbing and having a source of pressured gas and water comprising: a. reversing the surface plumbing thereby allowing the pumping of gas and fresh water down the lift tube, b. applying pressured gas and water into the lift tube thereby causing all differential control valves to open, c. circulating, under pressure, through the lift tube thereby carrying cleaning fluid through each differential pressure valve and returning said cleaning fluid to the surface through the production tubing, d. waiting for the flush process to finish, e. returning the surface plumbing to normal thereby allowing gas to flow up the lift tube through the wellhead and to the recovery system. 10. I claim the method of claim 9 wherein step cc is added immediately following step c: cc. continuing the reverse flush process until the eduction pump is cleaned. 11. I claim a method for reverse flushing a gas lift system in a well having a wellhead, surface casing, a casing, and having a lift tube with a series of differential pressure control valves placed within the casing and terminated at its distal end in an eduction pump wherein the eduction pump has a check valve in the inlet and wherein the differential pressure control valves communicate between the lift tube and the fluid contained within the casing and wherein the lift tube is in communication with a recovery system which normally receives gas from the wellhead through surface plumbing and having a source of pressured gas and water comprising: a. reversing the surface plumbing thereby allowing the pumping of gas and fresh water down the lift tube, b. applying pressured gas and water into the lift tube thereby causing all differential control valves to open, c. circulating, under pressure, through the lift tube thereby carrying cleaning fluid through each differential pressure valve and returning said cleaning fluid to the surface through the casing, d. waiting for the flush process to finish, e. returning the surface plumbing to normal thereby allowing gas to flow up the lift tube through the wellhead and to the recovery system. 12. I claim the method of claim 11 wherein step cc is added immediately following step c: cc. continuing the reverse flush process until the eduction pump is cleaned.
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