Compact lubricator and header system
A header with associated lubricator is for fluid handling at the wellhead of an oil and gas well where a plunger/lubricator lift system is deployed, and provides a novel compact lubricator with attached header which can replace a conventional wellhead flow-tee without modifying or moving other wellhead equipment to accommodate the new lubricator and header replacing the old flow-tee. A sub seal is provided at the header/lubricator attachment(s). The header with associated lubricator encloses a conduit with seals in the attachment interfaces between the header and lubricator or between the header and exit attachment means, where the conduit may also comprise a means of flow restriction through machined geometry or by retaining a reduced diameter or valve component through various means of attachment. The flow restrictor means may also be serviced via service access means provided in the header or lubricator exterior wall.
1. A method of installing a lubricator in a wellhead, said wellhead comprising a flow-tee having a horizontal dimension from a vertical centerline to a flange for connecting to external fluid handling equipment, the method comprising the steps of:
(a) providing a lubricator assembly comprising:
(i) a lubricator comprising (a) a lubricator body defining a longitudinal inner bore in fluid communication with an upper exit port and a lower exit port, and (b) an upper lubricator assembly comprising an anvil, spring cap, and a spring, and
(ii) a header disposed immediately adjacent and parallel to the lubricator body, the header defining a longitudinal bore in fluid communication with the lubricator inner bore through the lubricator upper exit port and the lubricator lower exit port, and defining an header exit port with attachment means to the external fluid handling equipment;
(iii) the lubricator assembly defining a horizontal dimension from the lubricator inner bore centerline to the header exit port attachment means, which horizontal dimension is the same as the flow-tee horizontal dimension;
(b) removing the flow-tee and replacing it with the lubricator assembly which has the same horizontal dimension, without further modifying the wellhead to fit the lubricator assembly; and
(c) connecting the header exit port to the external fluid handling equipment.
2. The method of claim 1 , wherein the lubricator assembly is part of a plunger lift system.
3. The method of claim 1 , wherein replacing the flow-tee with lubricator assembly comprises attaching a well-head connection flange at a lower end of the lubricator assembly to the wellhead.
4. The method of claim 1 , wherein: the flow-tee has a vertical dimension from a flow-tee base to a horizontal centerline of a flow-tee exit port defined by the flow-tee flange; the lubricator assembly defines a vertical dimension from a lubricator base to a horizontal centerline of the header exit port; and the lubricator assembly vertical dimension is the same as the flow-tee vertical dimension.
5. The method of claim 1 , wherein the lubricator assembly further comprises a flow restrictor for restricting fluid flow through the lubricator upper exit port, or through the lubricator lower exit port.
6. The method of claim 5 , wherein the flow restrictor comprises a plate or a tubular insert defining an orifice having an internal diameter less than an internal diameter of the lubricator upper exit port or the lubricator lower exit port.
7. The method of claim 5 , wherein the flow restrictor comprises an adjustable valve.
8. The method of claim 7 , wherein the flow restrictor comprises a handle for adjusting the valve, wherein the handle is outside of the lubricator body and the header.
9. The method of claim 5 , wherein the flow restrictor comprises a seal sub having an internal diameter less than an internal diameter of the lubricator upper exit port or the lubricator lower exit port.
10. The method of claim 9 , wherein the seal sub is removably attached to the lubricator exit port by a threaded connection.
11. The method of claim 9 , wherein the flow restrictor further comprises a plate or a tubular insert disposed in the seal sub, removably attached to the seal sub, and defining an orifice having an internal diameter less than the seal sub internal diameter.
12. The method of claim 11 , wherein the plate or the tubular insert is removably attached to the seal sub by a spring clip.
13. The method of claim 11 , wherein the plate or the tubular insert is removably attached to the seal sub by a threaded connection.
14. The method of claim 11 , wherein the flow restrictor further comprises an adjustable valve disposed in the seal sub.
15. The method of claim 14 , wherein the flow restrictor comprises a handle for adjusting the valve, wherein the handle is outside of the lubricator body and the header.
16. The method of claim 5 , wherein the lubricator body or the header defines an access port for access to the flow restrictor without disassembly of the lubricator and the header.
17. The method of claim 16 , wherein the flow restrictor is removable from the lubricator assembly via the access port without disassembly of the lubricator and the header.