Through BOP lubrication system
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.
1 . 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.
2 . The through BOP lubrication system according to claim 1 , wherein the top most riser tube element comprises the pressure gauge.
3 . The through BOP lubrication system according to claim 1 , wherein the riser further comprises a riser single bottom sub element, for connecting the riser with a single well tubing hanger plug profile.
4 . The through BOP lubrication system according to claim 1 , wherein the riser further comprises a riser dual bottom sub element, for connecting the riser with a dual well tubing hanger plug profile.
5 . The through BOP lubrication system according to claim 1 , wherein the dry rod comprises a plurality of dry rod tube elements, that are connected to each other via high torque rating dry rod joints.
6 . The through BOP lubrication system according to claim 5 , wherein the lower most dry rod tube element, comprises at the bottom end thereof a socket head, for connection with a running or retrieving tool.
7 . The through BOP lubrication system according to claim 1 , wherein the lubricator comprises a housing, an upper packing and a lower packing, wherein the upper and lower packings seal the polished rod against the housing.
8 . The through BOP lubrication system according to claim 7 , wherein the lubricator further comprises a hydraulically actuated middle packing that further seals the polished rod against the housing, wherein the middle packing is arranged in-between the lower and the upper packing of the lubricator.
9 . The through BOP lubrication system according to claim 1 , further comprising a C-plate.
10 . The through BOP lubrication system according to claim 1 , further comprising a dry rod lifting cap for lifting the dry rod.
11 . The through BOP lubrication system according to claim 1 , further comprising a riser lifting cap for lifting the riser.
12 . 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.
13 . The method of testing a through BOP lubrication system, according to claim 12 , further comprising the following step:
h. after step a, connect a running tool to the bottom of the dry rod.