GB/T 40546-2021 in English
VALIDDesign specification for coalbed methane well drainage engineering
- Issued on:2021-08-20
- Implemented on:2022-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | GB/T 40546-2021 |
| Document status: | VALID |
| Title in English: | Design specification for coalbed methane well drainage engineering |
| Title in Chinese: | 煤层气井排采工程设计规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2021-08-20 |
| Implemented on: | 2022-03-01 |
| ICS Classification: | 73.040-Coals |
| Professional Classification: | GB-National Standard |
| Related Keywords: | design specification
unit technology screw pump technology common requirements applicable specification key drainage intensity vertical well/directional well horizontal |
| Related Topics: | engineering design
Coal bed methane coal seam Pan coal meter design gas well GBT40546 GB/T 40546-2021 Full standard for gas production wells Design of rod pump drainage for coalbed methane wells Ventilation design specifications |
《GB/T 40546-2021煤层气井排采工程设计规范》由TC42（全国煤炭标准化技术委员会）归口，主管部门为中国煤炭工业协会。
Introduction
Analysis of standard technical framework
| Technical elements | Pumping unit technology | Screw pump technology | Common requirements |
|---|---|---|---|
| Applicable well types | Vertical well/directional well | Horizontal well (daily water production＞30m³) | Coal powder output characteristics need to be considered |
| Pump efficiency control | 60%-80% | Selection by displacement classification | Dynamic adjustment is required |
| Rod string design | Multi-level verification (SY/T5873) | Guide is required (full angle change rate＞3°/30m) | Stabilizer spacing specification |
Key technical points
Pumping unit selection case
Take a directional well with a daily water production of 15m³ as an example:
- Select a pump diameter of φ38mm according to Table 1
- The rod string stress calculation must meet the safety factor requirements of formula (1)
- Matching type 10 pumping unit (suspension point load ≤100kN)
Intelligent monitoring system
The standard requires the collection of 9 types of real-time data:
- Bottomhole flow pressure (accuracy ±0.1MPa)
- Dynamic liquid level (measurement error ≤5%)
- Screw pump torque (overload alarm threshold 150%)
Implementation suggestions
Coal powder control measures
When powder spitting occurs:
- Immediately reduce the drainage intensity to 50% of the original value
- Adjust the pump to 2m above the top boundary of the coal seam
- Install spiral centralizers (spacing ≤25m)
Sample only — not a preview of GB/T 40546-2021
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