Sino Tharwa Drilling Co…
Rig St4
Eng./Rabea Zaky
Equipment
© EnCana Corporation
Purposes of the BOP Stack
• Shut in the well – Pipe in or out of the hole
• Provide a means of pumping fluids into the well under pressure
• Allow the controlled release of fluids from the well
• Allow movement of the pipe under pressure
© EnCana Corporation
Annular Preventers
• Capable of closing on various shapes and sizes of pipe including Kelley, spiral drill collars and HWDP.
• Enables pipe to be rotated or stripped while under pressure.
• Closure is wellbore pressure assisted
• Hydraulic operating pressure is regulated to enable stripping operations.
© EnCana Corporation
Annular Preventers
Annular Preventer Closed on Pipe
Courtesy Hydril
© EnCana Corporation
Annular Preventers
Hydril GK Annular Closing Sequence
Courtesy Hydril
© EnCana Corporation
Only have weep (vent) hole
Cameron type D , DL
Courtesy Cameron
© EnCana Corporation
Cameron Type D Element
Courtesy GSF
© EnCana Corporation
Annular Preventers
Shaffer Annular - Stripping Pipe
Courtesy Shaffer
© EnCana Corporation
Annular Preventers
Shaffer Annular - Stripping Assembly
Courtesy Shaffer
© EnCana Corporation
Annular Preventers
Shaffer Annular - Closing Sequence
Courtesy Shaffer
© EnCana Corporation
Ram Type Blowout Preventers
• Fixed Pipe Rams
– Designed to close and seal around the pipe body
• Blind Rams– Designed to close and seal on open hole
• Shearing Blind Rams– Designed to shear (cut) the pipe body then close and
seal the wellbore
• Variable Bore Rams– Designed to close and seal on multiple pipe sizes
© EnCana Corporation
Ram Type Blowout Preventers
• Manual Ram Locking Systems
• Automatic Ram Locking Systems• Wellbore Pressure Assisted• Designed to Hold Pressure From Bottom Only
© EnCana Corporation
Ram Preventers
Cameron Type U Ram BOP
Courtesy Cameron
© EnCana Corporation
Ram Preventers
Cameron Pipe Ram Blocks
Courtesy Cameron
© EnCana Corporation
Ram Preventers
Cameron Shear Blind Ram Blocks
Courtesy Cameron
© EnCana Corporation
Chokes© EnCana Corporation
Manifold Valves
• Must be full opening• Have an ID equal or greater than the manifold
piping• Have a working pressure greater to or equal to
the BOP’s
© EnCana Corporation
Manifold Valves - Gate Type
Courtesy Cameron
© EnCana Corporation
String Valves
Hydril Kelly Guard
Courtesy Hydril
© EnCana Corporation
String Valves
Gray Valve (non return valve)
© EnCana Corporation
String Valves
Stabbing Valve Installation Handles
Drop Down Handleson Stabbing ValvesMust Have a Second Set of Pins to Enable“Pull Down” by CrewMembers When ThisValve is Installed
The stabbing valve wrenchmust be readily available.
During winter operations thisvalve must be stored in anopen position in a warm placeand be readily accessible.
© EnCana Corporation
String Valves
Floats
Courtesy Baker Hughes
© EnCana Corporation
BOP Control Systems
1. Accumulator Bottles
2. Recharge Pump
3. Fluid Reservoir
4. N2 Back Up System
5. Controls
Major Components
© EnCana Corporation
BOP Control Systems
Accumulator Bottles
© EnCana Corporation
BOP Control Systems
Major Components
© EnCana Corporation
BOP Control Systems
Accumulator Bottle
© EnCana Corporation
BOP Control Systems
Useable Fluid
© EnCana Corporation
Factors Affecting Surge Pressures
• Speed at which the pipe is run into the hole• Mud properties• Nozzle sizes• Annulus clearances
© EnCana Corporation
String Valves
Hydril FOSV
Courtesy Hydril
© EnCana Corporation
String Valves
Gray Valve
© EnCana Corporation