Through BOP lubrication system
AssigneeAbu Dhabi National Oil Company
InventorLaith Taissir El-Sayed
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Abstract
The present invention relates to a through BOP lubrication system, which is capable to be run-through a rig blow out preventer BOP, located below the rig floor, the through BOP lubrication system comprising a lubricator having a polished rod, wherein the polished rod at the bottom end thereof comprising a first high torque connection for connection with a dry rod; a riser for connecting the lubricator with the well tubing, wherein the riser is capable of running through a blowout preventer stack; a dry rod, which is arranged within the riser; and wherein the dry rod at the top end thereof comprises a second high torque connection, wherein the dry rod is connected to the polished rod of the lubricator via the first and second high torque connections.
Claims13
A through BOP lubrication system, which is capable to be run through a rig blow out preventer stack located below a rig floor, the through BOP lubrication system comprising:
- a. a lubricator having a polished rod, wherein the polished rod at a bottom end thereof comprising a first high torque connection for connection with a dry rod;
- b. a riser for connecting the lubricator with a well tubing, wherein the riser runs through the rig blow out preventer stack;
- c. the dry rod, which is arranged within the riser;
- wherein the dry rod at a top end thereof comprises a second high torque connection, and wherein the dry rod is connected to the polished rod of the lubricator via the first and second high torque connections;
- d. a kill line above BOP pipe rams and below a lubricator lower packing, and
- e. a BOP gauge and a riser pressure gauge for checking a pressure applied via the kill line, wherein the riser pressure gauge is arranged below the lubricator lower packing;
- wherein
- f. the riser comprises a plurality of riser tube elements, that are connected to each other via high pressure rating riser joints;
- and
- g. the lower most riser tube element comprises inlet holes for pressure testing the system via the kill line.
A method of testing a through BOP lubrication system, comprising the following steps in the following sequence:
- a. run a riser to above a tubing hanger, orient a bottom sub and land the bottom sub on the tubing hanger;
- b. close BOP bottom pipe rams;
- c. run a dry rod;
- d. connect a polished rod of a lubricator to the top of the dry rod;
- e. connect the riser with the lubricator;
- and close top pipe rams;
- f. apply pressure through a kill line above the BOP pipe rams and below a lubricator lower packing;
- and
- g. check pressure at BOP gauges and at a riser pressure gauge, wherein the riser pressure gauge is arranged below the lubricator lower packing.
Dependencies are inferred from the claim text.