𝗕𝗹𝗼𝘄𝗼𝘂𝘁 𝗣𝗿𝗲𝘃𝗲𝗻𝘁𝗲𝗿 | 𝗕𝗢𝗣

A blowout preventer (BOP) is a specialized valve or similar mechanical device, used to seal, control and monitor oil and gas wells to prevent blowouts, the uncontrolled release of crude oil or natural gas from a well. Selection of BOP will depend of:

a) Maximum Anticipated Surface Pressure,

b) Size of Casing, Drill String tools, Bits and others to be lowered during drilling, completion and well service,

c) Space between cellar and rotary table,

d) Well Head Flange size and e) service requirements. Specifications for BOP Equipment

BOP equipment shall be in accordance with the edition of API 16A or API 6A that was in effect at the time of the equipment manufacture. API 16AR should be used for BOP equipment remanufacturing. Modifications, alterations, or adjustments from the original design or intent of the BOP system shall be

Documented through the use of the equipment owner’s MOC (management of change) system. BOP Stack Classifications

The quantity of pressure containment sealing components in the vertical wellbore of a BOP stack (total number of ram and annular preventers) shall be used to identify the classification or “class” for the BOP system installed. For example, a Class 6 stack designation indicates a stack with a combination of six ram and/or annular preventers installed (e.g. two annular and four ram preventers or one annular and five ram preventers). After the classification of the BOP stack has been identified, the next nomenclature identifies the quantity of annular-type preventers installed and designated by an alphanumeric designation (e.g. A2 identifies that two annular preventers are installed). The final alphanumeric designation shall be assigned to the quantity of rams or ram cavities, regardless of their use, installed in the BOP stack. The rams or ram cavities shall be designated with an “R” followed by the numeric quantity of rams or ram cavities. (e.g. R4 designates that four ram-type preventers are installed). For example, a Class 6 BOP stack installed with two annular-type and four ram-type preventers is designated as “Class 6‑A2‑R4”. 13 5/8” 5K will mean a BOP with bore trough pass of 13 5/8” and a capacity of sealing of 5K PSI.

BOP Stack Capabilities: The system shall provide a means to a) Close and seal on the drill pipe, tubing, casing, or liner and allow circulation; b) Close and seal on open hole and allow volumetric well control operations; c) Strip the drill string; d) Shear the drill pipe or tubing when BSRs are installed; e) Circulate across the BOP stack to a choke manifold.

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