JPWO2021050520A5

JPWO2021050520A5 -

Info

Publication number: JPWO2021050520A5
Application number: JP2022515796A
Authority: JP
Publication date: 2023-06-27
Anticipated expiration: 2040-09-09

Claims

A wash pipe seal arrangement disposed between a non-rotating mechanical component and a rotating mechanical component and along a fluid conduit extending through said rotating and said non-rotating mechanical component, said wash pipe seal structure comprising: The washpipe seal structure is
having a non-rotating frame connected to the non-rotating mechanical component, the non-rotating frame including a non-rotating seal carrier, the non-rotating seal carrier being generally hollow cylindrical in shape defining an internal cavity;
a first non-rotating seal connected to the non-rotating seal carrier;
a second non-rotating seal connected to said non-rotating seal carrier, said first and second non-rotating seals being spaced apart from each other in said internal cavity;
a rotatable seal carrier rotatably disposed at least partially within the internal cavity;
a first rotating seal connected to the rotatable seal carrier and positioned adjacent to the first non-rotating seal;
The wash pipe seal arrangement having a second rotating seal connected to the rotatable seal carrier and positioned adjacent to the second non-rotating seal,
In operation, the first rotating seal abuts the first non-rotating seal to define a first sliding mechanical seal configured to seal the fluid conduit; and
In operation, the second rotating seal abuts the second non-rotating seal, is separated from the fluid conduit, and extends toward the first sliding mechanical seal. defining a second sliding mechanical face seal configured to seal a first portion of the internal cavity, the washpipe seal structure comprising:
further comprising at least one first spring positioned between the non-rotating seal carrier and the first non-rotating seal, the first non-rotating seal being slidable on the non-rotating seal carrier. and said at least one first spring biases said first non-rotating seal in a direction toward said first rotating seal;
further comprising at least one second spring positioned between said rotatable seal carrier and said second rotating seal, said second rotating seal being mounted on said rotatable seal carrier; slidably disposed, and wherein the at least one second spring biases the second rotating seal toward the second non-rotating seal;
Wash pipe seal structure.

further comprising a secondary seal disposed between the non-rotating frame and the rotatable seal carrier, the secondary seal being separated from the fluid conduit and the first portion of the internal cavity. , configured to seal a second portion of the internal cavity, the second portion of the internal cavity extending between the second sliding mechanical face seal and the secondary seal. A wash pipe seal structure according to claim 1.

3. The washpipe seal structure of claim 2, further comprising an exhaust port in fluid communication with said second portion of said internal cavity.

Further comprising a buffer fluid port in fluid communication with the first portion of the internal cavity, wherein in operation the fluid within the fluid conduit is adapted to be provided at a first pressure P1, the buffer fluid being applied to the internal cavity. 2. The washpipe seal structure of claim 1 adapted to be provided at a second pressure P2 to the first portion of the washpipe seal structure of claim 1, wherein P1≤P2.

2. The washpipe seal structure of claim 1, further comprising a flow reducing cross-section of said fluid conduit located at an upstream position with respect to said first sliding mechanical seal relative to a direction of fluid flow within said fluid conduit. .

A wash pipe seal structure for use with a mud pipe in a drilling operation, said mud pipe extending between a top drive and a drill string, said wash pipe seal structure comprising:
having a non-rotating frame connected to a non-rotating mechanical part of said top drive, said non-rotating frame including a non-rotating seal carrier, said non-rotating seal carrier being generally hollow cylindrical in shape defining an internal cavity. can be,
a first non-rotating seal connected to said non-rotating seal carrier and a second non-rotating seal connected to said non-rotating seal carrier, said first and second non-rotating seals being coupled to said spaced apart from each other within the internal cavity;
a rotatable seal carrier rotatably disposed at least partially within the internal cavity;
a first rotating seal connected to the rotatable seal carrier and positioned adjacent to the first non-rotating seal; and a second non-rotating seal connected to the rotatable seal carrier. The washpipe seal structure having a second rotating seal positioned adjacent to the seal,
defining a first sliding mechanical seal configured to, in operation, seal the mud pipe with the first rotating seal abutting the first non-rotating seal;
A second seal of said internal cavity wherein said second rotating seal abuts said second non-rotating seal and is separated from said mud pipe and extends toward said first sliding mechanical seal. defining a second sliding mechanical face seal configured to seal the portion of 1;
a buffer fluid is provided at a pressure at least equal to or greater than the pressure of the mud water within the mud pipe, the buffer fluid provided in the first portion of the internal cavity , the wash pipe seal structure comprising:
further comprising at least one first spring positioned between the non-rotating seal carrier and the first non-rotating seal, the first non-rotating seal sliding onto the non-rotating seal carrier. operably arranged and said at least one first spring biases said first non-rotating seal in a direction toward said first rotating seal;
further comprising at least one second spring disposed between said rotatable seal carrier and said second rotating seal, said second rotating seal being positioned on said rotatable seal carrier; and the at least one second spring biases the second rotating seal toward the second non-rotating seal;
Wash pipe seal structure.

further comprising a secondary seal disposed between the non-rotating frame and the rotatable seal carrier, the secondary seal being separated from the mud pipe and the first portion of the internal cavity. 4. A seal configured to seal a second portion of said internal cavity, said second portion of said internal cavity extending between said second sliding mechanical face seal and said secondary seal. 7. The wash pipe seal structure according to 6 .

further comprising an exhaust port in fluid communication with the second portion of the internal cavity, the exhaust port configured to permit the exhaust of the buffer fluid entering the second portion of the internal cavity; A wash pipe seal structure according to claim 7 .

7. The method of claim 6 , wherein the second sliding mechanical face seal is configured to allow controlled leakage of buffer fluid from the first portion of the internal cavity to the second portion. The washpipe seal structure described.

a buffer fluid port in fluid communication with the first portion of the internal cavity, wherein mud in the mud tube is provided at a first pressure P1, and the buffer fluid is in the first portion of the internal cavity; 10. The washpipe seal structure of claim 9 , provided at a second pressure P2 at P1≤P2.

7. The wash pipe seal structure of claim 6 , further comprising a flow reducing cross-section within said mud pipe positioned upstream relative to said first sliding mechanical seal relative to a direction of mud flow within said mud pipe. .

A wash pipe seal arrangement disposed between a non-rotating mechanical component and a rotating mechanical component and along a fluid conduit extending through said rotating and said non-rotating mechanical component, said wash pipe seal structure comprising: The wash pipe seal structure is
having a non-rotating frame connected to the non-rotating mechanical component, the non-rotating frame including a non-rotating seal carrier, the non-rotating seal carrier being generally hollow cylindrical in shape defining an internal cavity;
a first non-rotating seal connected to the non-rotating seal carrier;
a second non-rotating seal connected to said non-rotating seal carrier, said first and second non-rotating seals being spaced apart from each other in said internal cavity;
a rotatable seal carrier rotatably disposed at least partially within the internal cavity;
a first rotating seal connected to the rotatable seal carrier and positioned adjacent to the first non-rotating seal;
The wash pipe seal arrangement having a second rotating seal connected to the rotatable seal carrier and positioned adjacent to the second non-rotating seal,
In operation, the first rotating seal abuts the first non-rotating seal to define a first sliding mechanical seal configured to seal the fluid conduit; and
In operation, the second rotating seal abuts the second non-rotating seal, is separated from the fluid conduit, and extends toward the first sliding mechanical seal. defining a second sliding mechanical face seal configured to seal a first portion of the internal cavity, the washpipe seal structure comprising:
a damping fluid port in fluid communication with the first portion of the internal cavity; in operation, fluid within the fluid conduit is provided at a first pressure P1 and damping fluid is applied to the first portion of the internal cavity; provided to the portion at a second pressure P2, and P1 ≤ P2;
Wash pipe seal structure.