Examples of programs for Pressure Testing Wellheads.
1. Onshore
20in Casing
After installing the 20in casing and 20.3/4in -3 000 psi CHH, pressure test CHH and BOP’s to 500 psi against the bag type annular preventor and cement plug with the BHA in the casing prior drilling out the shoe track.
13.3/8in Casing
After bumping the 13.3/8in plug pressure test the casing to 2 500 psi.
Install the 20.3/4in x 3 000 - 13.5/8in x 5 000 CHS. Pressure test casing mandrel hanger top seal and wing valves to 2 500 psi with the cup type tester. Pressure test ring joint cavity to 2 500 psi.
9.5/8in Casing
After bumping the 9.5/8in plug pressure test the casing to 2 500 psi using the HP cementing head.
Install the 13.5/8in x 5 000 - 11in x 5 000 THS. Pressure test CMH top seal and wing valves to 2 500 psi with cup type tester. Pressure test ring joint cavity to
2 500 psi.
7in Liner
The liner should be tested according to the liner procedures as described under Pressure Testing 1 - Liner Lap Testing.
2. Offshore
13.3/8in Casing
After bumping the 13.3/8in plug pressure test the casing to 2 500 psi.
Install the 20.3/4in x 3 000 - 13.5/8in x 5 000 CHS. Pressure test casing mandrel hanger top seal and wing valves to 2 500 psi with the cup type tester. Pressure test ring joint cavity to 2 500 psi.
9.5/8in Casing
After bumping the 9.5/8in plug pressure test the casing to 2 500 psi using the HP cementing head.
Install the 13.5/8in x 5 000 - 11in x 5 000 THS. Pressure test CMH top seal and wing valves to 2 500 psi with cup type tester. Pressure test ring joint cavity to
2 500 psi.
7in Liner
The liner should be tested according to the liner procedures as described under Pressure Testing 1 - Liner Lap Testing.
3. Pressure Testing with a Slip and Seal Assembly
In case a slip and seal assembly is used to hang off the casing, the ring joint cavity should be pressure tested to a maximum of 50 % of the minimum collapse value as given in the following table.
|
Pressure Test |
Min. Collapse Pressure |
|
|
13.3/8in casing |
1 000 |
1 950 psi |
|
9.5/8in casing |
2 500 |
4 750 psi |
|
7in casing |
3 000 * |
7 020 psi |
* Do not exceed 3000 psi the 7in slip and seal assembly
The duration of each individual pressure test should be 15 minutes at a stabilised pressure.
BOP’s and surface equipment should be pressure tested to 5 000 psi against the plug type tester.