Coiled tubing maintenance

Technical Specifications – Coiled Tubing Maintenance Service Levels

Product Types – Coiled Tubing Maintenance Offerings

We offer the following coiled tubing maintenance products and services:

1. Injector Head Service & Overhaul – Full disassembly, chain/block replacement, bearing inspection/regreasing, load cell calibration, brake system test, reassembly with OEM parts.

2. Tubing Reel & Levelwind System Service – Bearing replacement, levelwind calibration, drum surface inspection, drive system test.

3. Power Pack (HPU) Maintenance – Fluid analysis, pump inspection/overhaul, filter replacement, heat exchanger cleaning, accumulator testing.

4. BOP Stack Recertification (API 16ST) – Level 1 (repair), Level 2 (annual), and Level 3 (5‑year) recertification services, including stripper rubber replacement.

5. Coiled Tubing Fatigue Management – String file creation and maintenance, cumulative fatigue modeling, remaining life prediction, corrosion monitoring.

6. Control Cabin & DAQ Service – PLC/HMI diagnostics, sensor calibration, software updates.

7. Critical Spare Parts Supply – Chains and chain blocks for all major injector head brands (Stewart & Stevenson, NOV, etc.), hydraulic pumps, valves, and seal kits, stripper rubbers and BOP seals, OEM‑spec replacement bearings and seals, PLC modules, sensors, and control components.

Applications – Where Our Coiled Tubing Maintenance Services Are Used

• Onshore well intervention fleets – Multi‑well pad operators in shale, tight oil, and CBM basins rely on our annual service programs to keep CT units operating at peak efficiency through thousands of intervention cycles.

• Offshore platform CT units – Marine‑grade maintenance with ATEX‑certified components and corrosion protection. Our offshore‑qualified technicians hold BOSIET/HUET certification.

• Hydraulic fracturing support – CT units performing plug drill‑outs and cleanouts operate under extreme pump rates, pressure cycles, and abrasive proppant returns. Our maintenance programs focus on stripper rubber life and injector head durability.

• Workover and well intervention contractors – Rental fleets benefit from our Level 2 annual recertification programs, ensuring equipment compliance for client audits.

• CT equipment rental companies – We provide consignment spares stocking and emergency repair services for high‑utilization rental fleets.

• Remote / international operations – Our global logistics network delivers spare parts to CT operations in the Middle East, Russia, Southeast Asia, and South America within 48‑72 hours.

Why Choose SJ Petro for Coiled Tubing Maintenance?

• Sinopec‑backed engineering – As a direct subsidiary of China’s largest oilfield equipment group, we have 314 R&D engineers, 2,100+ precision machines, and a 180,000+ m² manufacturing campus. Our maintenance facilities are equipped with API‑compliant test stands and NDT equipment.

• API RP 5C8 & 16ST compliance – Every maintenance procedure follows API recommended practices. Full documentation packages—inspection reports, test certificates, and certificates of conformance—are provided with every service.

• OEM‑level technical data – We maintain original engineering drawings for our own CT equipment and have reverse‑engineered major components for third‑party brands (Stewart & Stevenson, NOV, etc.).

• Global spare parts network – We stock critical CT spares—chains, blocks, bearings, hydraulic pumps, stripper rubbers, BOP seals, sensors—in Dubai, Singapore, and via our Houston agent. Most parts ship within 24‑48 hours.

• Field service worldwide – Our technicians hold BOSIET/HUET certification for offshore work and can mobilize to any rig or wellsite. We provide 24/7 emergency dispatch for injector head and BOP failures.

• Fatigue management expertise – We use industry‑standard fatigue modeling software to track tubing string life, helping operators avoid catastrophic pipe failures and extend string service life safely.

• Competitive direct pricing – No middleman markups. As a Sinopec subsidiary, we offer OEM‑quality maintenance at 15‑25% below Western service providers for equivalent API‑certified work.

• Warranty – 12 months on all maintenance workmanship and replacement parts (consumables excluded). Extended warranty available for major overhauls.

Frequently Asked Questions (FAQ)

Q1: What are the mandatory recertification requirements for coiled tubing well control equipment?
Per API RP 16ST, pressure control equipment must undergo a five‑year recertification. Annual service recertification and maintenance (Level 2) are also recommended. Our three‑level program covers repair (Level 1), annual maintenance (Level 2), and 5‑year recertification (Level 3).

Q2: How often should an injector head be overhauled?
The frequency depends on operating hours and load severity. Typical intervals: chain and block replacement every 1,500‑2,500 operating hours; full injector head overhaul every 5,000‑7,500 hours or 3‑5 years. We recommend an annual Level 2 inspection to determine overhaul timing based on actual wear measurements.

Q3: Can you maintain CT equipment from other manufacturers (e.g., Stewart & Stevenson, NOV, Cudd)?
Yes. We maintain engineering cross‑reference data for major CT equipment brands. For most standard components (chains, blocks, bearings, seals, pumps), we can supply OEM‑spec replacement parts. For unique components, we can reverse‑engineer from your sample.

Q4: What is coiled tubing fatigue management, and why is it important?
Coiled tubing is plastically deformed each time it is deployed and retrieved, accumulating fatigue. Without proper tracking, the tubing can fail unexpectedly, leading to parted strings and costly fishing jobs. We use fatigue modeling software to predict remaining safe cycles based on each string’s operational history—pressure, strain cycles, corrosion exposure, and wall thickness.

Q5: How do you test injector head brake systems?
We perform static holding torque tests (brake must hold rated load without slipping for a defined period) and dynamic response tests (brake applies within specified time when emergency stop is activated). All tests are documented with calibrated instruments.

Q6: What documentation do you provide after a BOP recertification?
You receive: findings report with photographs of all wear/corrosion, dimensional inspection data (ram bores, end connections), NDT report (MT/UT), pressure test certificate (low and high pressure hold times), function test certificate, and a new certificate of conformance for all replaced parts and work performed. All documents are traceable to the equipment serial number.

Q7: Can you perform onsite field repairs if my CT unit breaks down mid‑job?
Yes. We offer 24/7 emergency dispatch. Our field service trucks carry common CT spares (chains, blocks, bearings, seal kits, sensors) and diagnostic tools. On‑site repairs are documented and warrantied. For major failures, we can arrange component exchange (e.g., replacement injector head shipped while yours is repaired).

Q8: What is the typical lead time for a Level 2 annual maintenance service?
From receipt of equipment to return: 14‑21 days. This includes complete disassembly, cleaning, inspection, seal replacement, pressure/function testing, and documentation. Expedited service (10‑14 days) is available for an additional fee.

Q9: Do you provide spare parts for CT units operating internationally?
Yes. We maintain consignment stock in Dubai (Middle East/Africa) and Singapore (Asia‑Pacific), and partner with a stocking agent in Houston (Americas). Airfreight to most international CT hubs is 48‑72 hours. We also offer contract consignment programs for large CT fleets.