美国海洋钻井课程-井口和套管Wellheads and Casing
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to ~ 4,000 ft below mudline Cement to mudline
Now, finally, we can close the BOP if necessary
D
13 3/8”
6
Wellheads and Casing
A subsea wellhead, like a land wellhead:
7
Wellheads and Casing, cont.
In floating drilling, the casing hangers, casing seals and cementing heads differ from land and platform operations in the following manner:
4. Casing seals are run and set remotely.
10
Wellheads and Casing
5. Special test tools are required for remotely testing the casing seals.
6. Wear bushings are essential for protecting the wellhead.
2. Four guidelines guide bit, casing, etc to the right location on the seafloor.
8
Wellheads and Casing
1. The first and second casing strings are cemented with returns to the seabed.
2. Casing is run with the last joint madeup on a casing hanger and permanently suspended prior to cementing. Mud returns flow through fluting in the hanger.
❖ Must support the BOP’s whi suspended casing
while cementing, and ❖ Must seal off between casing strings
during drilling and production operations.
9
Wellheads and Casing
3. Usually, cementing plugs are located at the wellhead and released remotely. The cementing string from the vessel to the wellhead is drill pipe.
DRILLPIPE
~200
30”
Jet 30-in Conductor to ~ 200 ft below mudline No riser - “Mud” returns to seafloor No annulus - no cementing (in GOM)
4
FLOATER
Conventional Riser Drilling - Install 20-in Conductor
16
17
Utility Guide Frame
Hole Opener Temporary Guide Base
18
Procedure for Starting a Well
1. To get the well started, place a heavy steel template on the seafloor. Run on drillpipe.
11
Fig.4-10. Typical sealing arrangement for subsea wells.
12
13
Depth BML 240 ft
1,100 ft 4,100 ft
8,600 ft 10,100 ft
14
15
Permanent Guide
Structure.
Temporary Guide Base
30” 20”
5
FLOATER
Conventional Riser Drilling
- Install 13 3/8-in Surface Csg.
DRILLING RISER CHOKE LINE
BOP
Run Riser and BOP Stack Drill 17 1/2-in hole to 4,050 ft BML Drill with Mud returns to surface Run 13 3/8-in Surface Casing
2
Conventional Riser Drilling
FLOATER
DRILLING RISER CHOKE LINE
BOP
SEA WATER HYDROSTATIC
MUD HYDROSTATIC
SEAFLOOR
DEPTH
PRESSURE 3
FLOATER
Conventional Riser Drilling - Install 30-in Conductor -
美国海洋钻井课程 Offshore Drilling
井口和套管 Wellheads and Casing
1
Wellheads and Casing
❖ Drilling with a Riser ❖ Temporary and Permanent Guide Bases ❖ Fracture Gradients ❖ Subsea Cementing ❖ Casing Seals ❖ Drilling Procedures - An Example
DRILLING RISER CHOKE LINE
D
~1,050
Drill 26-in hole to 1,050 ft below mudline Riser optional - Mud returns to surface or seafloor Run 20-in Conductor to ~ 1,000 ft below mudline Cement to mudline
Now, finally, we can close the BOP if necessary
D
13 3/8”
6
Wellheads and Casing
A subsea wellhead, like a land wellhead:
7
Wellheads and Casing, cont.
In floating drilling, the casing hangers, casing seals and cementing heads differ from land and platform operations in the following manner:
4. Casing seals are run and set remotely.
10
Wellheads and Casing
5. Special test tools are required for remotely testing the casing seals.
6. Wear bushings are essential for protecting the wellhead.
2. Four guidelines guide bit, casing, etc to the right location on the seafloor.
8
Wellheads and Casing
1. The first and second casing strings are cemented with returns to the seabed.
2. Casing is run with the last joint madeup on a casing hanger and permanently suspended prior to cementing. Mud returns flow through fluting in the hanger.
❖ Must support the BOP’s whi suspended casing
while cementing, and ❖ Must seal off between casing strings
during drilling and production operations.
9
Wellheads and Casing
3. Usually, cementing plugs are located at the wellhead and released remotely. The cementing string from the vessel to the wellhead is drill pipe.
DRILLPIPE
~200
30”
Jet 30-in Conductor to ~ 200 ft below mudline No riser - “Mud” returns to seafloor No annulus - no cementing (in GOM)
4
FLOATER
Conventional Riser Drilling - Install 20-in Conductor
16
17
Utility Guide Frame
Hole Opener Temporary Guide Base
18
Procedure for Starting a Well
1. To get the well started, place a heavy steel template on the seafloor. Run on drillpipe.
11
Fig.4-10. Typical sealing arrangement for subsea wells.
12
13
Depth BML 240 ft
1,100 ft 4,100 ft
8,600 ft 10,100 ft
14
15
Permanent Guide
Structure.
Temporary Guide Base
30” 20”
5
FLOATER
Conventional Riser Drilling
- Install 13 3/8-in Surface Csg.
DRILLING RISER CHOKE LINE
BOP
Run Riser and BOP Stack Drill 17 1/2-in hole to 4,050 ft BML Drill with Mud returns to surface Run 13 3/8-in Surface Casing
2
Conventional Riser Drilling
FLOATER
DRILLING RISER CHOKE LINE
BOP
SEA WATER HYDROSTATIC
MUD HYDROSTATIC
SEAFLOOR
DEPTH
PRESSURE 3
FLOATER
Conventional Riser Drilling - Install 30-in Conductor -
美国海洋钻井课程 Offshore Drilling
井口和套管 Wellheads and Casing
1
Wellheads and Casing
❖ Drilling with a Riser ❖ Temporary and Permanent Guide Bases ❖ Fracture Gradients ❖ Subsea Cementing ❖ Casing Seals ❖ Drilling Procedures - An Example
DRILLING RISER CHOKE LINE
D
~1,050
Drill 26-in hole to 1,050 ft below mudline Riser optional - Mud returns to surface or seafloor Run 20-in Conductor to ~ 1,000 ft below mudline Cement to mudline