I. Core Technical Advantages: Explosion-Proof, Precision, and Automation
1. Explosion-Proof Safety DesignMotors, instruments, and sensors comply with Ex dⅡBT4 explosion-proof certification, ensuring stable operation in flammable and explosive drilling environments. The 380V three-phase four-wire power supply (0.75kW motor power) and gear pump capacity (5L/min) guarantee efficient hydraulic system output.
2. Electro-Hydraulic Closed-Loop Control
- Automatic Pressure Stabilization: A 10L accumulator pre-charged with 1.3MPa nitrogen automatically activates the electric pump when system pressure drops below 5MPa and stops it at 7MPa, maintaining stable oil pressure.
- Precision Adjustment: A three-position four-way directional valve controls throttle valve opening/closing, while a speed-regulating valve enables stepless adjustment of actuation speed. The 150kgf·m output torque meets the rigidity requirements of high-pressure manifolds.
3. Intelligent Monitoring System4–20mA high-precision sensors transmit real-time data for standpipe pressure (0–40MPa), casing pressure (0–40MPa), and valve opening (0–180°). Digital instruments display values with 0.5% FS accuracy and support over-limit alarms.
II. Solving Four Critical Well Control Challenges
1. Rapid Kick ResponseUpon detecting abnormal standpipe pressure (indicating a kick), operators remotely close the throttle valve and adjust its opening to maintain bottomhole pressure balance, preventing formation fluid invasion.
2. Blowout Emergency HandlingThe accumulator provides emergency power, allowing at least one throttle valve operation during power failure. A manual hydraulic pump (model JK7.2.7.6.00) supplements oil pressure for extreme conditions.
3. Adaptation to Harsh Environments
- Low-Temperature Performance: Electric sensors eliminate freeze-related failures common in pneumatic systems.
- Remote Control Expansion: Supports pump stroke counting, H₂S monitoring modules, and dual-throttle valve manifolds (denoted by prefix "Q").
III. Daily Maintenance: Key to 10-Year Service Life
1. Hydraulic System Maintenance
- Oil Management: Refill with No. 10 aviation hydraulic oil (SY1181-76 standard), replaced every 6 months. Filter through 140-mesh/inch screens during refilling.
- Leak Inspection: Daily checks of hydraulic line seals and fittings; refill immediately if oil level drops below the gauge minimum.
2. Critical Component Maintenance
- Accumulator: Check nitrogen pre-charge pressure (1.3MPa) every 6 months; replenish if below threshold.
- Sensor Calibration: Adjust via valve seat bolts if pressure readings deviate >2% from actual values (clockwise rotation increases pressure).
3. Electrical System ProtectionRegularly clean instrument box ventilation holes and inspect cable insulation. Reset thermal relays and check loads if motor overload indicators activate.
IV. Case Study: Field Validation in Southwest Oilfield
During a kick incident in a Southwest China ultra-deep well project, the DQYK-35BK demonstrated critical functionality:
1. Casing pressure sensors detected a surge from 15MPa to 28MPa, triggering audible/visual alarms;
2. Operators adjusted throttle valve opening from 50% to 20% within 30 seconds, stabilizing standpipe pressure;
3. The electro-hydraulic system maintained pressure autonomously without manual pump intervention, preventing blowout losses.
Maintenance Quick Reference Table
| Maintenance Category | Standard Requirement | Operation Method | Cycle |
| Hydraulic Oil Replacement | No. 10 aviation hydraulic oil | Filter before refilling; clean tank | 6 months |
| Accumulator Inspection | 1.3MPa nitrogen pre-charge | Replenish with dedicated tool | 6 months |
| Sensor Calibration | ≤2% display deviation | Adjust valve seat bolts | If deviation detected |
| Electrical System Check | Intact insulation, no damage | Multimeter test; clean vents | Daily inspection |
The control box of Shenyang Xinyulin, through intrinsically safe design and modular function expansion, is becoming the core hub of the intelligent well control system. In the future, with the embedding of remote control and AI pressure prediction algorithms, its value will shift from "emergency response to faults" to "risk prediction". For users, adhering to the replacement of hydraulic oil every six months and the annual inspection of accumulators is the true secret to achieving no major repairs in ten years.