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BS EN ISO 15136 — Downhole Equipment Progressing Cavity Pump Systems for Artificial Lift Standard Series
Downhole Equipment for Petroleum and Natural Gas Industries — Progressing Cavity Pump Systems for Artificial Lift (2001/2006 Edition)
🛢️ BS EN ISO 15136 is the standard series for downhole equipment for petroleum and natural gas industries — progressing cavity pump (PCP) systems for artificial lift, developed by ISO/TC 67, adopted by CEN, and published in the UK by BSI as a British Standard. The series specifies design, material, performance, and testing requirements for downhole PCP pumps (Part 1) and surface-drive systems (Part 2) — an important basis for design, selection, and quality assurance of artificial lift systems in heavy-oil, sand-bearing, and high-gas-oil-ratio wells.
💡 A progressing cavity pump (PCP) is a positive-displacement pump that conveys fluid by the relative rotation of a rotor inside a stator, forming sealed cavities. It is especially suited to heavy oil, sand-bearing, and high-viscosity fluids, offering simple structure, high adaptability, and low energy consumption.
1. Series Overview 📌
The BS EN ISO 15136 series comprises two parts. Part 1 (2001 edition, with 2002 corrigendum) specifies the downhole pump; Part 2 (2006 edition) specifies the surface-drive system. UK participation was entrusted to Technical Committee PSE/17 (Petroleum and natural gas industries); Part 2 was handled by Subcommittee PSE/17/-/4 (Drilling and production equipment).
2. Series Structure and Scope 🧩
The parts and their scopes are shown below. The series applies to the design, manufacture, testing, and inspection of PCP systems for artificial lift.
| Standard | Title | Core Content | Typical Use |
|---|---|---|---|
| BS EN ISO 15136-1:2001 | Downhole equipment for petroleum and natural gas industries — Progressing cavity pump systems for artificial lift — Part 1: Pumps | Structure, material, dimensions, performance, and testing of downhole PCPs | Downhole pump design, selection, procurement, acceptance |
| BS EN ISO 15136-2:2006 | Petroleum and natural gas industries — Progressing cavity pump systems for artificial lift — Part 2: Surface-drive systems | Requirements for surface drive units (motor, transmission, sealing, monitoring) | Surface drive selection, installation, operation |
⚠️ The downhole pump and surface-drive system must be matched: the pump’s torque, speed, and displacement demand determine the surface drive’s power and gear ratio; select and check the two parts as an integrated system.
3. Downhole Pumps (Part 1) 🔍
BS EN ISO 15136-1 specifies requirements for downhole progressing cavity pumps, mainly covering:
- Construction types: single-lobe and multi-lobe pump structures and main dimension series.
- Materials: stator elastomer and rotor material requirements adapted to well fluid (temperature, corrosion, abrasion).
- Performance: displacement-speed-head (differential pressure) characteristics, volumetric efficiency, and power requirements.
- Testing and inspection: hydraulic performance, sealing and pressure tests, inspection items, and acceptance criteria.
- Marking and documentation: product marking, factory documentation, and performance data requirements.
4. Surface-Drive Systems (Part 2) ⚖️
BS EN ISO 15136-2 specifies requirements for surface-drive systems:
- Drive unit: structure and performance of the drive motor, reduction/transmission, and drive head.
- Sealing and connection: sealing and strength of the drive rod seal and polished-rod/wellhead connection.
- Monitoring and control: torque, speed, load monitoring, and protective devices.
- Safety and installation: installation, operation, and maintenance safety requirements.
| System Part | Typical Requirements | Engineering Significance |
|---|---|---|
| Downhole pump (Part 1) | Displacement-head characteristic, materials, testing | Lifting capacity and service life |
| Surface drive (Part 2) | Power matching, sealing, monitoring | Reliable operation, safety protection |
✅ Practical value: the series provides complete technical requirements from downhole pump to surface drive for PCP systems; used with API and other production equipment standards, it supports economical and efficient lifting of heavy-oil and sand-bearing wells.
5. Engineering Practice 🛠️
- 🔍 System selection: determine pump type, speed, and surface drive power from well depth, fluid viscosity, sand content, and target production.
- 🔧 Installation and commissioning: run the downhole pump, install the surface drive, and perform trial operation per the standard and manufacturer instructions.
- 📊 Operation monitoring: monitor torque, current, speed, and production to assess pump and drive status.
- 📋 Maintenance: periodically inspect seals, transmission, and monitoring devices; address abnormalities promptly.
6. Operating Parameters and Common Issues ⚙️
The operating parameters of a PCP system (speed, torque, current, production) reflect the working state of the pump and drive. Reasonable speed setting balances displacement and stator life; an abnormal torque rise usually indicates wax deposition, sand blockage, or stator elastomer swelling; current fluctuation may relate to gas lock, pump-off, or viscosity change.
- 🔄 Speed control: adjust speed via VFD or gear change to match production and pump efficiency, avoiding excessive wear from overspeed.
- ⚡ Torque and current: monitor motor current and torque to identify overload, stuck pump, and other abnormalities.
- 🕳️ Gas lock and pump-off: for high-gas-oil-ratio wells, install a gas separator or control submergence to prevent gas lock.
- 🧲 Sand and abrasion: control submergence and speed in sandy wells and use wear-resistant stator and rotor to extend life.
In addition, periodically inspect the surface-drive system for seals, belts/gears, bearings, and lubrication, and monitor drive-rod wear and wellhead sealing, replacing worn parts promptly. Good operating records and maintenance practices significantly improve PCP reliability and the pump-repair cycle.
7. Frequently Asked Questions ❓
❓ Q: Which well conditions suit a progressing cavity pump?
A: PCPs suit heavy oil, high viscosity, sand-bearing, and high gas-oil-ratio conditions because of their positive-displacement conveyance and abrasion resistance; however, they are sensitive to temperature and certain chemicals (e.g., aromatics), so evaluate during selection.
A: PCPs suit heavy oil, high viscosity, sand-bearing, and high gas-oil-ratio conditions because of their positive-displacement conveyance and abrasion resistance; however, they are sensitive to temperature and certain chemicals (e.g., aromatics), so evaluate during selection.
❓ Q: How are the downhole pump and surface drive matched?
A: The pump’s torque and speed requirements determine the surface drive’s power and gear ratio; check the system as a whole to avoid under- or over-capacity.
A: The pump’s torque and speed requirements determine the surface drive’s power and gear ratio; check the system as a whole to avoid under- or over-capacity.
❓ Q: How is the stator elastomer material chosen?
A: Choose the stator elastomer grade by well fluid temperature, media (oil, water, gas, sand), and chemical compatibility to ensure temperature, oil, wear, and sealing performance.
A: Choose the stator elastomer grade by well fluid temperature, media (oil, water, gas, sand), and chemical compatibility to ensure temperature, oil, wear, and sealing performance.
🔍 Q: How does this series link to API 11S and similar standards?
A: This series coordinates and complements API 11S (PCP systems) and other production equipment standards; in practice they are combined to cover the full design, manufacture, and testing workflow.
A: This series coordinates and complements API 11S (PCP systems) and other production equipment standards; in practice they are combined to cover the full design, manufacture, and testing workflow.