Wellhead Safety Control System

Hydraulic control and emergency-shutdown package for monitoring and fail-safe operation of surface and subsurface well safety valves.

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Red wellhead safety control system with solar power package

SYSTEM OVERVIEW

Purpose and operating principle

A wellhead safety control system provides the hydraulic power, logic, monitoring and shutdown interfaces required to operate surface safety valves (SSV) and subsurface safety valves (SCSSV). It is used where a controlled, fail-safe response is required at unattended wells, production sites and platforms.

How the system works

The hydraulic power section charges dedicated control circuits to the selected SSV and SCSSV operating pressures. Local controls and field inputs maintain the valves in their commanded positions during normal service. If a confirmed shutdown condition occurs—such as high or low process pressure, fire-loop activation, emergency shutdown, loss of control pressure or another approved trip—the system vents the relevant hydraulic circuit in the defined sequence so the fail-safe valves move to their safe positions. Reset and restart follow the approved cause-and-effect and operating procedure.

Main features

Control and monitoring of surface safety valves and subsurface safety valves
Independent hydraulic-pressure circuits matched to each controlled valve
Solar-energy and electric hydraulic-pump power-source options
Local manual operation with emergency-shutdown and remote-trip interfaces
High- and low-pressure pilot monitoring where required by the shutdown philosophy
Fusible-loop/fire-detection input and low-hydraulic-pressure shutdown options
Pressure gauges, regulators, accumulators, reservoirs, filters and relief protection selected for the approved circuit
Single-well or multi-well architecture with project-specific sequencing
Outdoor cabinet, open-skid or enclosed-panel arrangements for the installation environment
Reset, bypass, alarm and indication functions defined by the approved cause-and-effect matrix

Typical applications

Unattended onshore production wells
Offshore wells and production platforms
Oil and gas production wellheads
Remote well sites using solar-powered hydraulic control
Surface and subsurface safety-valve control
Emergency shutdown and well-isolation systems

RFQ INPUTS

Information required

Number of wells and controlled valves
SSV and SCSSV actuator type, operating pressure, swept volume and fail-safe action
Required opening/closing sequence and maximum response time
Available electrical, pneumatic or solar power
Shutdown inputs, alarm outputs and remote-control/SCADA interfaces
Cause-and-effect matrix and permissive/bypass philosophy
Process pressure range and high/low pilot set points
Ambient temperature, hazardous-area classification, IP rating and corrosion environment
Cabinet/skid material, tubing material and connection requirements
Inspection, testing, certification and documentation requirements

The final hydraulic schematic, components, set points, trip logic, operating sequence and valve response are confirmed against the approved safeguarding philosophy and valve data.

TECHNICAL DATA

Configuration and supply basis

Power-source options	Solar energy, electric hydraulic pump or project-approved utility supply
Control objects	Surface safety valves (SSV) and subsurface safety valves (SCSSV)
System architecture	Single-well or multi-well; local, remote or integrated control as specified
Hydraulic circuits	Separate regulated circuits according to valve actuator pressure, volume and closing-time requirements
Shutdown inputs	Emergency shutdown, high/low process pressure, fusible loop/fire signal, low control pressure and other approved field inputs
Typical control functions	Valve open/close, staged shutdown, reset, status indication, alarm, test and controlled bypass where approved
Enclosure arrangement	Outdoor cabinet, weatherproof panel or skid package selected for area classification and environment
Instrumentation	Pressure gauges, switches/transmitters, regulators, filters, accumulators and relief devices as required
Operating environment	Applicable temperature, corrosion exposure, hazardous-area classification and ingress protection confirmed per project
Inspection and testing	Tubing/circuit inspection, leak and pressure tests, functional tests, trip simulation and cause-and-effect verification to the approved ITP
Documentation	Datasheet, general arrangement, hydraulic schematic, bill of materials, cause-and-effect, set-point schedule, test records and operating manual

Supply positioning

Energy Equipment International supplies wellhead control and safety systems against approved project requirements. Manufacturing, certification, functional-safety and performance claims apply only when confirmed in the selected supplier’s approved documents and test records.