The XJ450's place in the lineup is defined by its hoisting train: a 1125kN hook rating on a 4×5 traveling system with Φ26mm drill line, backed by a mast that cleans 32m and holds 1200kN static. Power comes from a CAT C15 rated at 540 bhp driving through an Allison M5620AR gearbox, with the drawworks good for 450rpm on the fast line and 180kN pull on the second floor. Within that envelope the rig works 5500m of 73mm tubing or 4500m of 73mm drill pipe, the deep-repair, casing and fishing programs that sit above the 350HP class. The 12×8 all-terrain carrier carries the whole package, mast, drawworks, ZP175 rotary table and floor, as one load, so cluster wells are serviced by driving between sites instead of rebuilding the spread.
The engine is a CAT C15 tuned to 540 bhp for workover duty: high low-end torque for the moment the 4×5 block takes the string, and a reserve that keeps drum speed from sagging when the drawworks pulls 180kN on the second floor. The Allison M5620AR gearbox matches engine output to drum speed without clutch-shift interruptions, which is what keeps the 450rpm fast-line rating usable in continuous tripping.
The traveling system strings the load over four lines per side, and the 26mm drill line keeps line tension inside the drawworks rating at full hook load. Maximum hook loading sits at 1125kN against a mast static rating of 1200kN, so casing strings and stuck-pipe jarring are carried without leaning on the mast's reserve.
On the 12×8 chassis the mast, drawworks, rotary table and floor travel as a single unit. That removes the auxiliary trailer spread from the move plan and lets one rig service a dispersed cluster by road, including the mountain and mud-season tracks where split loads would need escorts.
The ZP175 rotary table and the drawworks' 450rpm fast-line speed set the tripping and rotating capability for the 73mm tubing to 5500m and 73mm drill pipe to 4500m envelope. Drilling-floor heights of 3.5m, 4m or 4.5m are selectable so the table lines up with the BOP stack and cellar of the target wells.
The C15, the M5620AR and the standard 26mm wire line and 4×5 sheave geometry are common items in the oilfield parts market, which keeps consumable cost and lead time predictable. Maintenance documentation and spare lists follow the same catalog as the rest of the ZYT workover fleet, so a customer running multiple XJ rigs stocks one parts set.
The build treats plateaus, deserts and mud-season fields as the default rather than an option: sand and corrosion protection on the carrier and mast, engine-block heating for cold starts, and a dust-sealed hydraulic system. The same standard build covers -30℃ plateau sites and 55℃ desert fields without climate-option rework.
| Product | 450HP Workover Rig (XJ450) |
|---|---|
| Product line | Workover Rigs |
| The depth of workover | 5500m (73mm tubing) 4500m (73mm DP) | |
| The max. loading | 1125kN | |
| The type of traveling system | 4×5 | |
| Diameter of rope | Φ26 | |
| Engine | CAT C15/540 bhp | |
| The model of gear box | Allison M5620AR | |
| Mast | Clean height | 32m |
| The max. static loading | 1200kN | |
| Drawwork | The max. pull of fast line | 180KN (the second floor) |
| Diameter of wire line | 26mm | |
| The max. rotate speed | 450rpm | |
| Drilling floor | Height | 3.5m /4m/ 4.5 (can choose) |
| Model of rotary table | ZP175 | |
For a useful technical response, include the target well conditions, operating depth or pressure, expected quantity, destination and any required configuration.
Send an InquiryAvailable configurations can be matched to the equipment model, operating conditions and project requirements.
Questions about the XJ450 cover its 5,500 m tubing envelope, 1,125 kN hook and 12×8 one-load moves.
The XJ450 is not a 350HP rig with more paint: the engine steps to a CAT C15 at 540 bhp, the hook rating rises to 1125kN on a 4×5 system with Φ26mm line, and the mast's 1200kN static capacity supports 5500m of 73mm tubing workover against roughly 2400m-class duty for the smaller model. The other structural change is the 12×8 chassis, which carries the full spread as one road load.
The 12×8 all-terrain carrier handles the move itself: with the mast laid and outriggers stowed, the rig drives between wells as one unit and the ZP175 rotary, floor and drawworks stay rigged for the next site, so no auxiliary hoisting or separate rig-up crew is needed for routine relocation.
Depth rating is string-dependent: 5500m with 73mm tubing, or 4500m with 73mm drill pipe, inside the 1125kN hook and 1200kN mast limits. If the operator's program needs a different envelope, the mast height, floor height and hoisting parameters are adjusted at order time and the change is documented in the factory test report.
The XJ450 is the step-up when the 650 kN class cannot hold the program: the 1125 kN hook on the 4×5 reeve, paired with the CAT C15 at 540 bhp, holds the 5500 m on 73 mm tubing and the 4500 m on drill-pipe envelope without derating. The work it carries on top of ordinary workover — heavy casing pulls, long-stroke fishing, and trips on large tubing — is work the 350 HP class starts to lose cycle time on, not because it cannot lift, but because the hook and the hoist margins thin out. State the heaviest expected pull and the longest planned string at order time; the mast height, floor opening and drawworks ratio are matched to that envelope.
Every unit ships with installation drawings, operation and maintenance manuals, and a first-period recommended spare list; remote technical guidance is free for the life of the rig. Because the C15/M5620AR drivetrain and 4×5 traveling geometry are standard across the XJ fleet, spare supply follows one parts catalog. On-site commissioning and operator training are available for the initial deployment.
Commercial terms are confirmed in the quotation for the exact configuration, quantity and destination.
Manufactured to API 4F and API 7K at the Jingzhou plant under ISO 9001:2015 quality management; the 32m mast is proof-loaded to its 1200kN static rating, and the drawworks verified at 180kN second-floor pull and 450rpm before dispatch. Certificate scope is listed in the quotation.
Operation manuals, spare-parts catalog and factory acceptance test report are supplied in English and Chinese; on-site commissioning and operator training can be arranged at the Jingzhou plant or at the well site.
Confirmed in the quotation according to configuration, quantity and destination.
Manuals, conventional spare parts and remote technical guidance are included; on-site commissioning and operator training can be arranged on request.
Payment schedule, Incoterms, port and packaging are agreed in the sales contract.
A recommended spare-parts list for the first operating period is provided with the quotation.
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