A coiled tubing unit is only as good as the fit between the job and the package. This page answers the questions buyers actually ask during specification — injector capacity, reel sizing, well control, power, mounting and documentation — for the 40,000 lbf to 160,000 lbf units built by Sino Petroleum Equipment Group in Qingdao, China.
If you already have the operating envelope, send it to sales@coiledtubingunit.com and the technical proposal comes back with a configuration, a drawing package scope and a price. If you are still deciding what to specify, read the coiled tubing unit selection guide first.
Quick facts
- Injector capacity: 40K, 60K, 80K and 100K catalog units; 160K on engineered order.
- Mounting: skid-mounted for platforms and rig floors; trailer-mounted for road transport between wells.
- Reel examples: 1.5″ CT × 6600 m, 2″ CT × 6500 m at 15,000 PSI working pressure.
- Well control: quad ram BOP stacks at 10,000 and 15,000 PSI, NACE anti-H2S lubricators, wellhead adapter flanges.
- Power: Caterpillar C13 class diesel on 60K–100K units; C15 class on 180K liquid nitrogen skids.
- Scope: unit design, manufacture, factory acceptance test, documentation, export packing, commissioning support, spare parts.
Coiled tubing unit — frequently asked questions
What is a coiled tubing unit (CTU)?
A coiled tubing unit is a well intervention package that runs continuous steel tubing into a live well instead of jointed pipe. A complete unit consists of an injector head, a coiled tubing reel, a hydraulic power pack, an operator control cabin, a gooseneck and stripper, and a well control stack (BOP and lubricator). Units are built skid-mounted for platforms and rig floors, or trailer-mounted for road transport between onshore wells.
What injector capacities does Sino Petroleum build?
The catalog covers 40K, 60K, 80K and 100K injector capacity coiled tubing units in both skid-mounted and trailer-mounted configurations, with a stated product range of 40,000 lbf to 160,000 lbf. Larger capacities are quoted as engineered projects rather than catalog items.
Skid-mounted or trailer-mounted coiled tubing unit — which should I choose?
Choose skid-mounted when the unit works on an offshore platform, a rig floor or a fixed yard: the footprint is compact, shipping is cheaper and a crane or handler is already available. Choose trailer-mounted when the unit must move between onshore wells on public roads: the trailer carries the reel, injector, power pack and cabin as one road-legal package, so rig-up time per well is much shorter.
How do I size the injector head for my well?
Size on the maximum pick-up and snub force the job needs, not on a nominal tonnage. The calculation uses the deepest TVD, the largest CT outside diameter, the weight of the tubing string in the well fluid, BHA weight, and friction plus a safety margin. If the program includes milling, sand clean-out or extended reach work, confirm the expected over-pull before fixing capacity.
How much coiled tubing can the reel hold?
Reel capacity depends on tubing OD and wall thickness. Catalog examples include a 1.5 inch × 6600 m high-pressure reel skid and a 2 inch × 6500 m reel skid rated for 15,000 PSI service, plus quick-detachable drum skids and yard spoolers. Always specify tubing length plus BHA length plus a working margin when requesting a reel.
What well control equipment is supplied with the unit?
A typical package includes a quad ram BOP stack (blind or shear, pipe, slip and kill rams), a coiled tubing lubricator, a stripper, and a wellhead adapter flange. Catalog BOP sizes include 3-1/16 inch at 10,000 PSI, 4.06 inch at 10,000 PSI and 5.12 inch at 10,000 and 15,000 PSI, and lubricators are available in NACE anti-H2S configuration.
What engine and power pack are used?
The 60K to 100K units use a Caterpillar C13 class diesel engine driving the hydraulic system for the injector, reel and BOP accumulator; 180K liquid nitrogen pump skids use a C15 class engine. Power pack sizing follows the maximum simultaneous hydraulic demand of the injector and reel.
What documentation is delivered with a unit?
Delivery documentation includes general arrangement and hydraulic drawings, a factory acceptance test report, material and pressure test certificates for pressure-containing items, operation and maintenance manuals, and a packing list. Third-party inspection and client witness testing can be arranged at the factory on request.
What is the lead time and price of a coiled tubing unit?
Both depend on capacity, mounting type, reel size, well control rating and the instrumentation specified, so they are quoted per project. Send the operating envelope (CT size, depth, pressure, well fluid, ambient conditions) to sales@coiledtubingunit.com and the technical proposal and commercial quotation are prepared for that configuration.
Are spare parts and consumables available after delivery?
Yes. Consumables and wear items include stripper elements, packings, shear and pipe rams, check valves, CT connectors and hydraulic filters. Spare parts are quoted against the unit serial number so that the correct pressure rating and material class are supplied.
Can the unit be customized for our field conditions?
Yes. Common customizations are injector capacity, skid or trailer layout, cabin position, zone-rated electrical equipment, low or high ambient temperature packages, desert or offshore corrosion protection, and client-specified major components. Customization is handled as an engineered order with drawings approved before manufacture.
Which standards and specifications are followed?
Equipment is designed with reference to the API standards used in coiled tubing service, including API 16C for well control equipment and API 7-1 for rotary drilling equipment threads, with NACE MR0175 material selection for H2S service where required. The standards invoked, inspection level and acceptance criteria are stated in each project specification and confirmed in the approved drawings.
Related equipment
- Coiled tubing units — skid and trailer mounted, 40K to 160K.
- Liquid nitrogen units — 15K to 180K pump skids, 10,000–15,000 PSI.
- Pressure control equipment — BOP stacks, lubricators, flanges.
- Downhole tools — centralizers, locators, knuckle joints, setting tools.
Need this quoted against a specific well? Send maximum TVD, CT outside diameter and length, wellhead pressure, well fluid and H2S presence, ambient temperature and the services you intend to run. Request a quotation.