Single Well Control System

Introduction:

Single well control system, also named ESD Control Panel. It can simultaneously control subsurface safety valve (SCSSV), Christmas Tree main valve (MSSV) and wing valve (WSSV), and achieve sequential on/off function to reduce the frequency of use of SCSSV and improve its durability and reliability.

It adopts the two-step decompression control principle, which can greatly save the energy loss during use and improve the operation efficiency.

Main Controlled Components:

• Downhole Safety Valve (DHSV / SSSV)

• Surface Safety Valve (SSV)

• Wing valves, master valves on the Christmas tree

• Pressure sensors and emergency shutdown (ESD) loop

Core System Components:

1. Hydraulic Power Unit (HPU)

   • Hydraulic reservoir, pneumatic / electric pump, accumulator, pressure relief valves

2. Control Panel

   • Pressure gauges, regulating valves, manual override, ESD pushbuttons, fusible plug interfaces

3. Safety Logic & Shutdown Loops

   • High / low pressure interlock

   • Fire detection and fusible plug shutdown

   • Local and remote ESD function

4. Communication Module (Optional)

   • RTU / PLC for remote monitoring, data transmission, and remote control to central DCS / SCADA system

Key Functions:

• Local manual operation of surface and downhole safety valves

• Remote opening / closing and real-time status monitoring

• Automatic well shutdown on overpressure, underpressure, or abnormal conditions

• Fire-activated emergency shutdown via fusible plugs

• ESD interlock with plant or platform safety systems

• Loss of fluid / air pressure failsafe shutdown

• Alarm indication and fault logging

Typical Applications:

• Onshore oil and gas production wells

• Unmanned remote well sites

• Offshore platform individual producing wells

• High-pressure and high-yield gas wells

• Hazardous area wellhead control