Coiled tubing technology
Technical Parameters – CT Technology Capabilities
| Parameter | Standard Range | Advanced Capability |
|---|---|---|
| Tubing OD (in) | 1.0 – 2.875 | 3.5” (special order) |
| Tubing grades | CT80, CT90, CT100 | CT110, CT80-SS |
| Max pressure (psi) | 5,000 – 10,000 | 15,000 (with heavy wall) |
| Max tension (lbs) | 30,000 – 70,000 | 100,000 (2.875” CT110) |
| Fatigue life (cycles to failure) | 50 – 200 (depends on pressure & bend) | Calculated by FEA |
| Horizontal reach (w/o tractor) | 2,000 – 3,000m | 4,500m (with friction reducer) |
| Max horizontal reach (with tractor) | 5,000m+ | 7,000m (field demo) |
| Injector slip efficiency | 95-98% | 99% (with tension control) |
| Real-time sensors | Depth, tension, pressure | + torque, vibration, downhole P/T |
| Data logging rate | 1 Hz | 10 Hz (high-res option) |
Product Types – CT Technology Applications
| Technology Package | Best For | Key Components |
|---|---|---|
| Standard Intervention | Well cleanout, acidizing, logging | CT80 tubing, basic fatigue monitor, standard injector |
| Heavy Milling / Drilling | Bridge plug milling, scale removal, slimhole drilling | CT100/110 tubing, high-torque motor, vibratory tool |
| Extended Reach | Long horizontal laterals (shale, tight gas) | Friction reducer, tapered string, hydraulic tractor |
| H2S / CO2 Sour Service | Sour gas wells, injection wells | CT80-SS tubing, nickel-plated, sour BOP seals |
| Real-Time E-Coil | Geosteering, formation evaluation, precision intervention | Wired tubing, downhole P/T/CCL, surface readout |
| Coiled Tubing Drilling (CTD) | Re-entry sidetracks, underbalanced drilling | CT110 tubing, downhole motor, PDC bit, MWD option |
Applications – Technology in Action
| Application | Technology Used | Performance Gain |
|---|---|---|
| Scale milling in 4,200m deep well | CT100 tubing, high-torque motor | Removed 80m of scale in one run – 3 days saved |
| Acid stimulation in 3,000m horizontal shale well | Friction reducer + CT90 tubing | Reached 4,200m lateral – 30% beyond previous limit |
| Sour gas well cleanout (6% H2S) | CT80-SS tubing + sour BOP | Zero corrosion issues after 18 months |
| Underbalanced CTD in depleted reservoir | CT110 + PDC bit + MWD | 400m sidetrack in one trip |
| Bridge plug milling (composite + cast iron) | CT100, aggressive mill bit, vibratory tool | Milled 12 plugs in 8 hours – conventional took 2 days |
Why Choose SJ Petro for Coiled Tubing Technology?
1. We’re Not Just a CTU Supplier – We’re a Technology Partner
We provide tubing grade recommendations, fatigue modeling, tool selection, and operational parameters. Our engineering team includes former CT field supervisors who have run thousands of jobs.
2. Field-Proven Under Sinopec’s Own Wells
Our CT technology has been deployed in:
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Sichuan shale gas (6,000m depth, 150°C)
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Tarim deep wells (7,200m, 10,000 psi)
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Bohai Bay offshore platforms
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Middle East sour gas (15% H2S)
Every technology we offer has been stress-tested in commercial operations.
3. Complete Technology Stack – No Black Boxes
From tubing manufacturing to fatigue software to downhole tools – we either make it or have exclusive partnerships. You never get "sorry, that feature is from another supplier, they don’t share data.”
4. Custom Tubing Strings
We can design tapered strings (different wall thickness along length) to optimize weight vs fatigue. We also offer bimetallic tubing (corrosion-resistant cladding on standard base).
5. Global Technical Support & Training
We provide:
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On-site fatigue management training
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Tubing inspection workshops (MPI, UT)
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Job design consultation (free for technology customers)
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24/7 hotline for troubleshooting CT operations
6. Continuous R&D
Our R&D center (shared with Sinopec) is currently working on:
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CT grade CT120 (120 ksi yield) for ultra-deep
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Composite coiled tubing (non-metallic)
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AI-based fatigue prediction (machine learning)
FAQ – Coiled Tubing Technology
Q1: What is the main cause of coiled tubing failure in the field?
A: Fatigue cracking due to repeated plastic bending under pressure – not tension. Our fatigue monitoring system tracks bending cycles × pressure × tension. The second cause is corrosion (H2S, CO2, chlorides), addressed by grade selection (CT80-SS or nickel plating).
Q2: How accurate is your fatigue life prediction compared to classical models?
A: Classical models (like the one in API 5ST) use generic coefficients. Our system uses actual tubing mill test data and field calibration from hundreds of strings. Typical accuracy within ±15% – enough to set safe retirement thresholds.
Q3: Can I use your technology to extend the life of my existing CT string?
A: Yes. We can install a fatigue monitor retroactively (sensors on reel and injector) and model remaining life based on past job records (if you have depth logs). Then we provide a remaining safe cycle estimate.
Q4: What is the maximum depth you have reached with coiled tubing technology?
A: Vertical: 7,800m (China Tarim). Horizontal lateral (from vertical depth 3,000m): 4,200m (Sichuan shale). With tractor: 5,500m horizontal (Middle East pilot project). Depths are limited by tubing weight and injector push, not by our technology.
Q5: How does your vibratory tool help with lockup?
A: It generates axial oscillations (10-30 Hz) at the BHA. The vibrations temporarily reduce the coefficient of friction between tubing and wellbore from ~0.35 to ~0.10 dynamic. This allows weight transfer 30-50% further compared to static friction.
Q6: What is the lead time for custom CT tubing (e.g., CT110 with tapered wall)?
A: Mill order: 90-120 days. We keep standard CT80/CT90 in stock (2” OD, 0.175” wall) for immediate shipping. Tapered strings require 3-4 months from order.
Q7: Can your technology support coiled tubing drilling (CTD) in hard rock?
A: Yes, with limitations. We’ve drilled short sidetracks (200-500m) in sandstone and limestone. For hard granite, we recommend hybrid rotary/CT systems. Contact our CTD specialist for formation-specific advice.
Q8: Do you offer training on CT technology (not just equipment operation)?
A: Yes – 5-day course "Coiled Tubing Technology & Fatigue Management” covering: tubing metallurgy, failure modes, injector mechanics, hydraulic modeling, job planning, and real-time optimization. Available at your site or our training center in Jingzhou.
