1- Sssv Overview

What is a Subsurface Safety Valve?

POW! Subsurface Safety Valve

• A Subsurface Safety Valve (SSSV) is a device which automatically shuts in the well in case of a major malfunction of the surface equipment, preventing the uncontrolled flow of hydrocarbons to the surface.

• FAIL SAFE – if there is a failure in the surface equipment the SSSV will close

Internal Use Only

Why do we install them? TO PREVENT A CATASTROPHE! To Prevent Infrastructure And Production Loss.

To Prevent Environmental Contamination Due To Uncontrolled Hydrocarbon Flow.

Law Requirements. Many Countries’ Laws Require The Installation Of SSSVs In Offshore Wells.

Internal Use Only

SSSV Classification • Tubing Retrievable Safety Valves (TRSV) – –

Integral Part of the Tubing String Require Tubing to be Removed for Retrieval of the Safety Valve

• Wireline Retrievable Safety Valves (WLRSV) –

–

Installed Inside the Tubing by Using a Locking Device to Secure Them Inside a Safety Valve Landing Nipple (SVLN) or a standard Landing Nipple in the case of a SSCSV WLRSVs can be Installed and Retrieved Without Removal of the Tubing

• Closure Mechanisms – – –

Flapper Ball Poppet (Used only in SSCSVs)

Internal Use Only

Surface Controlled Subsurface Safety Valves (SCSSV)

• Uses a Piston Which Hydraulic Pressure Acts to Open the Closure Mechanism • Spring Acts in Opposite Direction on Piston to Close the Closure Mechanism as Hydraulic Pressure is Lost • In Most Designs, Well Pressure Acts With the Spring to Oppose the Hydraulic Pressure and Close the Valve

Internal Use Only

Surface Controlled Subsurface Safety Valves

• Preferred SSSV In Use Today • Can Be Shut-in From The Surface Using The Control Manifold, For Testing And Well Maintenance. • Can Be Tied Into The Surface Safety System To Shut-in The Well In Response To ESD And Fire Alarms

Internal Use Only

Hydraulic Control Line

•A ¼” OD Control Line is used to connect the Control Manifold to the Safety Valve. •The Control Line comes on a spool and has been filled with control fluid and tested.

Internal Use Only

Hydraulic Control Line

•Control line is attached to the tubing using either: •Control line protectors •Steel banding straps •Tie wraps •Combination

Internal Use Only

How Does a SCSSV Work? Hydraulic Pressure Hydraulic Control Line

• Valve is closed  Well (Tubing) Pressure is contained by the SSSV Flapper

P Pressure

Subsurface Safety Valve

• Apply Hydraulic Pressure to the Control Line  Acts on the piston  Moves the SSSV towards the open position. Hyd. Press. ≥ Well Press. + Open Press. • Pressure is maintained in Hydraulic the Control Line to Pressure  Valve is open. Flow is established surface. operate theto valve

OPEN CLOSED Formation Pressure

• If pressure is bled off  Valve goes to its “fail safe” closed position. Fail Safe Condition Well Pressure acting on the back side of the piston

Internal Use Only

How A Control Manifold Works •Supply gas (blue) is fed to the manifold.

MANUAL SHUTDOWN

•This gas runs a hydraulic pump and is also regulated (yellow) to feed Fusible Plugs, Manual Shutdown Stations, or other controls used to monitor the Production System.

FUSIBLE PLUG

SUPPLY GAS

CONTROL MANIFOLD

TO SCSSV

•The hydraulic pressure created by the pump (red) is applied downhole to the Safety Valve. •This pressure is used to equalize and open the safety valve, then hold it open during normal flowing conditions.

Internal Use Only

How A Control Manifold Works

CONTROL PRESSURE RELEASED

SUPPLY GAS

CONTROL MANIFOLD

TO SCSSV

•If for any reason (e.g. Fire, Catastrophe, Control Failure, etc.), the control pressure (yellow) is released. •The hydraulic pump in the manifold is by-passed by a control valve. • Hydraulic pressure is released back into the reservoir. •Allows the downhole safety valve to close.

Internal Use Only

Halliburton Halliburton Surface Surface and and Subsurface Subsurface Safety Safety System System for for a a Producing Producing Well Well TO SALES LINE PNEUMATIC ACTUATOR

QUICK EXHAUST

INSTRUMENT AIR SUPPLY PNEUMATIC PRESSURE TO SSV LO AND HI MONITOR PILOT

SAFETY CONTROL PANEL

LEVEL SWITCH FUSIBLE LO AND HI PLUG MONITOR PILOT HEATER

SAND EROSION PILOT HYDRAULIC PRESSURE TO DHSV

SEPARATOR

LEVEL SWITCH

FUSIBLE PLUG

TO SALES STORAGE

Legend Pneumatic Line Hydraulic Line

Internal Use Only

Tubing Retrievable Safety Valve A A

B

A A

B

Tubing Pressure Hydraulic Control Line Pressure, Used To Open Valve Hydraulic Control Line, Typically 1/4” OD Nipple Profile For Secondary Insert Lock Mandrel / WLRSV Assembly Piston / Flow Tube Spring (Used to close valve by offsetting hydrostatic head of C/L fluid and moving flowtube up to allow flapper to close)

Self-Equalizing Feature (TRSV’s are also available in Non-Equalizing Designs) Flapper Closure Mechanism

Open

Lower Honed Bore For Insert Lock Mandrel / WLRSV Assembly

Closed

Internal Use Only

TRSV

TRSV vs WLRSV •TRSVs are the primary SSSV used in new well completions today due to: • ID nearly equivalent to tubing • No restriction to flow or tool access below valve • Improved reliability • Provision secondary WLRSV in the event the TRSV fails •WLRSVs are mostly used today in: •Secondary insert valve in TRSV •Casing restriction allowing only SVLN to be installed •Existing fields with SVLN

Internal Use Only

WRSV

Wireline Wireline Retrievable Retrievable Safety Safety Valve Valve

Lock Mandrel

Safety Valve

• X, R Nipple Profile • Single Control Line • Same Size Packing Bores

Landing Nipple

Internal Use Only

Sliding Side Door Safety Valve L/N

Features • Sleeve Opens when valve is inserted • Sleeve Closes when valve is removed • Control Line Fluid Protected from Contamination Internal Use Only

Regulatory Requirements • Subsurface Safety Valves are manufactured and tested to API Specification 14A / ISO 10432 • Subsurface Safety Valve Systems are designed, installed, repaired, and operated in accordance with API Recommended Practice 14B / ISO 10417.

Internal Use Only