The object of Blowout Prevention Equipment Test is to eliminate all leaks and to determine that the equipment will perform under threatened blowout conditions. Generally, Blowout Prevention Equipment Test should be conducted in accordance with the following guidelines.
Guidelines of Blowout prevention Equipment Test (BOP)
- All tests are to be performed using clear water. Adding a small amount of saffron dye (available at grocery stores) to the water will assist in detection of leaks.
- The initial “low pressure” test of each piece of blowout prevention equipment must be conducted at a pressure between 200 and 300 psi.
- The subsequent “high pressure” test is conducted at the rated working pressure of the equipment for all:
a. Ram-type preventers
b. Choke manifolds and valves
c. Kill lines and valves
d. Upper and lower kelly cocks, top drives, inside BOP’s, safety valves
- The “high pressure” test of the bag-type annular preventer should be conducted at 70% of its rated working pressure. NOTE: In some drilling operations, the pressures to be used for low and high pressure testing of preventers and casing may be different from those given above due to governmental regulations, or approved local practices.
- If a BOP does not pass the low pressure test, do not test to the high pressure and then drop back down to the low pressure.
- Subsea BOPE should be stump tested at the surface with water in the manner described above before installation on the seafloor.
- Surface and subsea BOPE must be pressure tested as follows:
a. When installed
b. Before drilling out each string of casing
c. Before working inside new casing strings where cement is not drilled out
d. Following the disconnection or repair of any wellbore pressure seal in the wellhead/BOP stack assembly (limited to the affected components only)
e. In any event, at least once every seven days for Class IV and V stacks and every 30 days for Class II and III stacks. NOTE: The weekly pressure test is not required for blind and blind-shear rams. Test these rams only when installed, when a pressure seal is broken or after setting a new string of casing. However, blind and blind-shear rams must be actuated at least once every seven days.
- All valves located downstream of the valve being tested must be placed in the open position.
- 9. Variable bore pipe rams should be tested with all sizes of pipe in use, excluding drill collars and bottom hole tools.
- All pressure tests must be held for a minimum duration of five minutes with no observable
Please read: Blowout Preventer