When | The minimum BOP stack must include |
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(1) The expected pressure is less than 5,000 psi, | Three BOPs consisting of an annular, one set of pipe rams, and one set of blind-shear rams. |
(2) The expected pressure is 5,000 psi or greater or you use multiple tubing strings, | Four BOPs consisting of an annular, two sets of pipe rams, and one set of blind-shear rams. |
(3) You handle multiple tubing strings simultaneously, | Four BOPs consisting of an annular, one set of pipe rams, one set of dual pipe rams, and one set of blind-shear rams. |
(4) You use a tapered drill string, | At least one set of pipe rams that are capable of sealing around each size of drill string. If the expected pressure is greater than 5,000 psi, then you must have at least two sets of pipe rams that are capable of sealing around the larger size drill string. You may substitute one set of variable bore rams for two sets of pipe rams. |
Code of Federal Regulations
173
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(5) You use a subsea BOP stack | The requirements in § 250.442(a) of this part. |
BOP system when expected surface pressures are less than or equal to 3,500 psi | BOP system when expected surface pressures are greater than 3,500 psi | BOP system for wells with returns taken through an outlet on the BOP stack |
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Stripper or annular-type well control component | Stripper or annular-type well control component | Stripper or annular-type well control component. |
Hydraulically-operated blind rams | Hydraulically-operated blind rams | Hydraulically-operated blind rams. |
Hydraulically-operated shear rams | Hydraulically-operated shear rams | Hydraulically-operated shear rams. |
Kill line inlet | Kill line inlet | Kill line inlet. |
Hydraulically-operated two-way slip rams | Hydraulically-operated two-way slip rams | Hydraulically-operated two-way slip rams.Hydraulically-operated pipe rams. |
Hydraulically-operated pipe rams | Hydraulically-operated pipe rams.Hydraulically-operated blind-shear rams. These rams should be located as close to the tree as practical | A flow tee or cross.Hydraulically-operated pipe rams. Hydraulically-operated blind-shear rams on wells with surface pressures >3,500 psi. As an option, the pipe rams can be placed below the blind-shear rams. The blind-shear rams should be located as close to the tree as practical. |