General Description

BOP is a large valve used to control wellbore fluids. In this type of valve, the sealing element resembles a large rubber doughnut that is mechanically squeezed inward to seal on either pipe (drill collar, drillpipe, casing, or tubing) or the openhole. A ram-type blowout preventer is basically a large bore valve. The ram blowout preventer is designed to seal off the well bore when drill pipe, casing, or tubing is in the well. In a BOP stack, ram preventers are located between the annular blowout preventer and the wellhead. 

Specifications

Design & Manufacture：API 16A, GB/T20174 
Connection：Studded top,flange/Studded bottom
Nominal Diameter: 4-1/16"~21-1/4"
Working Pressure: 2, 000psi, 3, 000psi, 5, 000psi, 10, 000psi, 15, 000psi, 20, 000psi 
Body    Material: Forging 
Drive Type: Hydraulic

Functions
•  It can seal annular space between drilling tools and casing.
•  It can fully seal wellhole if there's no drilling tools inside.
•  In some situation, when wellbore closed, operator can do the process of mud circulation, blowout control, well control through connection with manifold from BOP body outlet.
•  It can hang drilling tools.

Design Features

• The oval ram and cavity design reduces stress in the BOP body;
• The ram BOP provides a pressure energized seal with maximum contact area with the drill pipe, casing, or tubing, ensures a lower rubber pressure and increased service life;
• Sealing Is enhanced by well pressure on the ram;