CBM drilling solutions
Technical Specifications – CBM Drilling Solutions
The tables below present key specifications for our CBM drilling solutions range.
CBM Drilling Rigs – Vehicle‑Mounted / Crawler Type
| Parameter | HFMC‑800+ (Truck) | MD‑750 (Crawler) | HFMZJ Series (Skid) |
|---|---|---|---|
| Drilling depth (Φ89mm pipe) | 3,200 m | 3,200 m | 600–2,000 m |
| Engine power | 2 × 276 kW / 522 kW total | 2 × 276 kW | 300–900 kN pull |
| Max rotary torque | 20 kN·m @ 85 rpm / 10 kN·m @ 170 rpm | 34,000 N·m @ 85 rpm | 7,500–20,000 N·m |
| Max rotary speed | 170 rpm | 170 rpm | 170 rpm |
| Spindle thru‑hole diameter | 75 mm | 75 mm | 50–76 mm |
| Max tilt angle | 85° | 80° | — |
| Power head stroke | 15 m | 15 m | — |
| Hydraulic system pressure | 32 MPa | 32 MPa | — |
| Total weight | 51–54 t | — | 32–58 t |
| Drive | Full hydraulic | Full hydraulic | Full hydraulic |
| Control system | Double PLC, digital monitoring | Remote control, separate cabin | PLC + PV75 alarm |
Recommended Drilling Program Parameters – CBM
| Parameter | Typical Value / Range | Notes |
|---|---|---|
| Well depth | 800–3,200 m | Standard production wells |
| Hole size | 89–127 mm | Optimized for coal seam penetration |
| Hook load capacity | 300–900 kN | HFMZJ series range |
| Rotary speed | 85–170 rpm | Lower speed for torque, higher for coring |
| Power swivel torque | 7,500–20,000 N·m | Sufficient for CBM formations |
| Circulation media | Mud, water, air, mist, foam | Switchable in minutes |
| BOP rating | 3,000–5,000 PSI | Low pressure appropriate for CBM |
| Drilling methods | Rotary, directional, horizontal, multilateral, coring | Full spectrum |
Kingdream Downhole Motor & Bit Specifications (for CBM)
| Component | Specification | Application |
|---|---|---|
| MD high‑speed motor bit | Rotary speed: 300–90 RPM | Directional and horizontal wells |
| PDC bits | Force‑balanced, asymmetrical blades, spiral gauge | Soft to medium‑soft CBM formations |
| TCI tricone bits | Tungsten carbide inserts | Hard interbedded stringers |
| Positive displacement motor (PDM) | Various sizes | Smooth torque for coal formations |
Product Types – CBM Drilling Solutions Portfolio
We offer a complete CBM drilling solutions product line covering the entire well construction lifecycle:
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CBM Drilling Rigs (Full Hydraulic) – Vehicle‑mounted (truck chassis or crawler) and skid‑mounted configurations. Depths from 800 m to 3,200+ m. Designed for rapid relocation and low ground pressure, making them ideal for environmentally sensitive CBM fields.
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Underbalanced / Air Drilling Packages – Integrated air compressors, foam injection systems, rotating BOP heads, and dust collectors. For low‑pressure coal seams where conventional mud would invade and damage permeability.
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Low‑Damage Drilling Fluids (ACWD System) – Novel low‑damage plugging and anti‑collapse water‑based drilling fluid gel system specifically designed for CBM. Exhibits excellent rheological stability, plugging capability, and minimal core damage (7.73% damage rate). Field‑proven in the Ordos Basin.
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Downhole Motors and Drill Bits (Kingdream) – PDC bits for soft‑medium formations, TCI tricone bits for interbedded sections, and downhole mud motors (PDMs) for smooth torque delivery.
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Directional / MWD / Geosteering Systems – Real‑time gamma, resistivity, and directional data for horizontal laterals. Near‑bit MWD technology provides accurate real‑time data directly from the bit, enabling effective geosteering in deep CBM development.
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Solids Control & Cuttings Management – 3‑4 stage solids control packages (shale shakers, desanders, desilters, centrifuges). For air drilling, dry dust collectors prevent coal fines from contaminating the site.
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Well Completion & Workover Support – Hydraulic workover units for CBM well intervention. Using hydraulic jacks to push or pull pipe against wellbore pressure, these units are designed for live‑well operations without killing the well. Ideal for pump changes, tubing repair, and recompletions.
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CBM Geosteering & Formation Evaluation Software – Integrated modeling, real‑time guidance, and post‑well analytics.
Applications – Where Our CBM Drilling Solutions Are Used
Our CBM drilling solutions have been deployed in CBM basins across the globe:
China (Qinshui Basin, Ordos Basin, Sichuan) – Leading CBM producer. Our solutions are used in vertical and horizontal development wells, with air drilling and low‑damage fluid systems protecting coal permeability. Field application in the Ordos Basin JX‑1 well validated the ACWD system’s effectiveness in mitigating fluid loss, preventing wellbore instability, and enhancing drilling efficiency.
Australia (Surat Basin, Bowen Basin) – Major CBM‑to‑LNG projects. Our rigs and downhole motors are used for large‑scale multi‑well pad development. Australian CBM projects face challenges of low permeability, strong heterogeneity, and stringent environmental requirements — precisely where our underbalanced and low‑damage solutions excel.
India (Gondwana Basin) – Emerging CBM producer poised to become the world’s fifth largest. Our CBM drilling solutions provide the right equipment for India’s coal seam geologies.
United States – Established CBM basins (Powder River, San Juan). Our drilling rigs and formation protection fluids complement existing operations.
Why Choose SJ Petro for CBM Drilling Solutions?
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Sinopec‑backed expertise with Kingdream – Kingdream is a Sinopec group company with over 40 years of dedicated drill‑bit manufacturing history. A national high‑tech enterprise recognized as a leading oil drill bit manufacturer in China and one of the world’s most advanced in the industry. Through this collaboration, we deliver unmatched downhole performance.
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Formation‑first design philosophy – Our CBM drilling solutions prioritize reservoir protection. Low‑damage fluid systems, underbalanced drilling capabilities, and coal‑optimized bits are standard — not add‑ons.
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Fast‑moving, low‑environmental‑impact rigs – Our vehicle‑mounted and crawler rigs minimize surface disturbance and move quickly between wellheads. Low ground pressure reduces the need for heavy pad construction over coal seams.
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API & ISO certified, fully compliant – Our drilling rigs and downhole tools are manufactured under API 4F, 7K, and 8C standards. Third‑party inspection (ABS, DNV, BV, SGS) is always welcome.
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Proven in major CBM basins – From China’s Qinshui Basin to Australia’s Surat Basin, our CBM drilling solutions have thousands of drilling hours and hundreds of wells of field validation.
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Complete integrated solution, single vendor – Rig, fluid system, bits, motors, directional tools, and solids control — all from one API‑certified manufacturer. No finger‑pointing between suppliers, no warranty gaps.
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Global field support & spare parts – Field engineers with CBM‑specific expertise. Spare parts stocked in Dubai, Singapore, and via our Houston agent. 24/7 technical support.
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Competitive direct‑manufacturer pricing – As a Sinopec subsidiary, you pay factory‑direct prices for world‑class CBM drilling solutions.
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Warranty – 12 months on all components (rigs, tools, bits). Extended warranty available.
Frequently Asked Questions (FAQ)
Q1: What makes CBM drilling different from conventional oil and gas drilling?
CBM reservoirs are shallower (300–1,500 m), lower pressure, and highly sensitive to drilling fluids. Conventional mud systems can invade coal cleats and permanently block gas flow, significantly reducing well productivity. Specialized underbalanced and air/foam drilling techniques, combined with low‑damage fluid systems, are essential for protecting coal permeability.
Q2: What is the typical depth range for your CBM drilling rigs?
Our rigs cover the full CBM depth spectrum: 800 m to 3,200+ meters. For shallow coal seams (under 1,000 m), our vehicle‑mounted rigs are ideal for rapid multi‑well pad drilling. For deeper basins, our skid‑mounted and crawler rigs provide the necessary capacity and stability.
Q3: Do you provide underbalanced and air drilling capabilities?
Yes — all our CBM drilling rigs are designed to handle mud, water, air, mist, and foam circulation. Underbalanced drilling is a core feature of our CBM drilling solutions, not an expensive add‑on. Air compressors, foam injection systems, and rotating BOP heads are fully integrated.
Q4: How does the ACWD low‑damage drilling fluid system protect coal formations?
The ACWD (anti‑collapse water‑based drilling fluid gel system) exhibits superior plugging performance, sealing simulated 400 µm fractures with zero filtrate loss at 5 MPa pressure. It reduces core damage rate from nearly 20% (conventional polymer system) to just 7.73%. In field applications, it effectively mitigates fluid loss and prevents wellbore instability in complex coal formations.
Q5: Can your CBM drilling solutions support horizontal and multilateral wells?
Absolutely. Horizontal CBM wells are becoming increasingly common. Our rigs are equipped for MWD, geosteering, and horizontal drilling. Kingdream’s MD high‑speed motor bits are specifically suited for directional and horizontal wells.
Q6: How quickly can your CBM rigs move between wells?
A vehicle‑mounted or crawler CBM rig can relocate between wellheads on a multi‑well pad in a matter of hours — not days. This rapid mobility dramatically reduces non‑productive time and is essential for high‑density CBM field development.
Q7: Do you provide training for CBM drilling crews?
Yes. We offer a comprehensive training program at our factory or your wellsite covering CBM formation protection principles, underbalanced drilling techniques, rig operation, and low‑damage fluid system management.
Q8: What documentation do you provide with CBM drilling solutions?
API 4F/7K/8C certificates (as applicable), material test reports (EN 10204 3.1) for all downhole tools, low‑damage fluid system specifications and SDS (Safety Data Sheets), operations manuals, and dimensional drawings.
Q9: Can you supply CBM drilling solutions for pilot exploration programs?
Yes — we offer both purchase and short‑term rental options. Rental programs (minimum 3 months) include rig, downhole tools, and field support. Ideal for exploration campaigns where capital budgets are limited.
