As late-life wells accumulate inaccessible tubing strings, the cutting decision is rarely just about separating metal. The operation must establish a predictable release point, preserve the surrounding completion where possible, and avoid creating extra handling constraints at the location. China Vigor's Wireline-Conveyed Thermit-Jet Cutting Tool (WTCT) is designed for that recovery problem. It combines a wireline-deployed anchoring device with a thermit-jet burner so the tool can be positioned, fixed against the tubular wall, fired, released, and retrieved in a controlled sequence.
A Cutting Method Without Explosives
The WTCT uses a high-temperature, high-pressure molten-metal jet to wash and ablate the target tubular rather than relying on an explosive charge. That distinction matters when an operator is planning logistics, permits, and handling procedures around a workover. The anchor holds the cutting assembly against the pipe's internal wall before ignition, helping maintain the intended cutting geometry instead of allowing the tool to move during the event. After the cut, the surface control process commands unanchoring before the string is recovered.
For intervention teams, this approach creates a defined operational sequence:
Run the wireline tool to the confirmed target depth and anchor it inside the tubular.
Apply the controlled ignition output, complete the cut, unanchor, and retrieve the assembly for surface inspection.
Published Envelope for Tubular Work
Public WTCT data list burner outside diameters from 1 inch through 3-1/8 inches, supporting selection around the tubular restriction and target wall. The specified temperature rating extends to 347°F, while the pressure rating is stated as 15,000 psi. Each thermit-jet cutting assembly contains 4 thermal cartridges, each listed at 14 inches long. The published maximum electrical input is 1,200 W, with DC input up to 500 V and 2,000 mA.
The configuration tables describe applications across tubing, coiled tubing, casing, and drill pipe. For example, the tubing table includes 2-3/8-inch tubing with wall thicknesses from 0.167 to 0.336 inches using a 1-1/2-inch cutting assembly and 4 cartridges. It also lists 4-1/2-inch tubing at 0.271 to 0.380 inches wall thickness with a 3-1/8-inch assembly. These figures are selection references, not a substitute for confirming the actual tubular grade, weight, wall condition, well pressure, and service procedures.
Surface Control Supports the Sequence
A downhole cutting method is only as repeatable as its surface execution. The WTCT control arrangement is specified with 220 V AC input, 48 to 55 Hz input frequency, and a DC output range of 0 to 500 V. Its output current range is 0 to 2,000 mA. The panel separates anchoring, ignition, and unanchoring modes, giving the crew discrete steps rather than an undifferentiated power application. Published measurement resolution is 1 V for voltage and 1 mA for current.
That visibility can help supervisors document the sequence and compare planned settings with operating observations. It does not eliminate the need for cable-head checks, depth correlation, pressure-control preparation, or a pre-job review of contingency actions. If the tool does not release normally, the published operating description identifies a mechanical release option based on shearing pins, with specified current and line-pull conditions to be evaluated only under the approved procedure.
Planning Around Cut Quality
A technically successful cut starts before the tool enters the well. The team should confirm the pipe tally, drift or restriction information, predicted temperature and pressure, cable compatibility, and the recovery objective. In complex strings, the desired separation may be above a damaged interval, below a packer, or at a point that preserves a fish profile for the next operation. Those choices affect tool diameter and cartridge selection.
Verify the target tubular dimensions and wall range against the applicable WTCT selection table.
Define acceptance criteria for the cut, including expected string movement, recovery plan, and post-job inspection records.
A Focused Option for Intervention Programs
The market context is straightforward: mature-well intervention programs continue to value methods that reduce location complexity while keeping a clear recovery workflow. The WTCT's contribution is technical rather than promotional. Its anchored delivery, thermit-jet cutting mechanism, modular diameter range, and published 347°F and 15,000 psi ratings provide concrete inputs for engineering review. Used within a qualified operating program, the tool gives wireline teams a non-explosive route for planned tubular separation when accurate placement and disciplined surface control are priorities.
*Contact China Vigor: info@vigorpetroleum.com | +86 29 81161513*
