Oilfield logging teams need to lower downhole instruments through a well, collect data, and move the equipment between field locations. The cable carries the instrument and may also carry power and signal circuits, so the winch must control payout speed, cable tension, depth, and winding quality.
This case study covers a custom wireline logging winch developed for a North China oilfield project. You can find more information on the Solution page. The KLD-CLG-150 system uses an aluminum-alloy structure, a 2.2 kW servo motor, PLC and touchscreen control, an automatic reciprocating-screw cable guide, an encoder, a load cell, and an optoelectronic slip ring. The project specification sets the machine self-weight at 150 kg or less, a cable capacity of 213 m, and a continuously adjustable cable speed of 0.4-0.8 m/s.
What Problems Did the Oilfield Logging Team Need to Solve?
The field operation placed five requirements on the logging winch. First, the equipment had to move between well sites with limited handling support. Heavy equipment increases setup effort and makes relocation slower. Second, the cable needed controlled winding. Disordered layers can increase mechanical wear and expose the downhole instrument to sudden tension changes.
The operator also needed more control over depth and speed. A fixed or poorly controlled payout rate makes it harder to match the instrument movement with the logging procedure. Cable tension was another concern. Without a live tension value, the operator has less information when the cable encounters drag, a change in well geometry, or a temporary obstruction.
The cable itself created a further engineering requirement. The project used a composite cable with power and signal circuits. The rotating drum therefore needed an electrical and optical interface that could maintain the required connections while the cable was wound and paid out.
These conditions led to a lightweight wireline winch with integrated mechanical, electrical, sensing, and control functions.
What Were the Requirements for This Wireline Logging Winch?
The customer defined the main requirements before the design was completed. The machine self-weight had to be 150 kg or less, and the unit had to remain practical for manual movement around the well site. It needed automatic cable spooling, real-time display of cable length and tension, adjustable payout speed, and a rotating connection for composite-cable power and signal transmission.
The requirements were:
| Requirement | Project specification |
| Machine self-weight | 150 kg or less |
| Project-defined instrument load | 150 kg, corresponding to the downhole instrument mass in this case |
| Cable management | Automatic reciprocating-screw cable guide |
| Measurement | Encoder for payout length and load cell for cable tension |
| Cable interface | Optoelectronic slip ring |
| Speed control | Continuously adjustable payout and retrieval |
| Site movement | Swivel casters for manual repositioning |
The resulting system is a custom logging winch with mechanical, electrical, sensing, and control functions. The frame, drive, gearbox, guide, sensors, slip ring, and control interface work as one operating system.
How Was the Custom Wireline Logging Winch Designed?
Each part of the KLD-CLG-150 was selected against a field requirement. The design addresses handling weight, speed control, cable protection, measurement, composite-cable connectivity, and movement between operating positions.
Lightweight Aluminum-Alloy Structure
The winch uses high-strength aluminum-alloy profiles and alloy components. The design also includes an RV-type aluminum gearbox. This material selection reduces the equipment mass while keeping the drum, drive, and control components in one mobile assembly.
The specified machine self-weight is 150 kg or less. That figure is a project requirement and should be checked against the final configuration, including the cable, control accessories, guards, and any optional mounting parts. The actual handling method should also be reviewed during site planning.
Aluminum alloy is suitable for a field machine that needs repeated movement. Its use in the frame and gearbox housing also supports the corrosion-resistance objective described in the project brief. The final environmental suitability still depends on surface treatment, storage, cleaning, temperature, and exposure conditions.
Servo Drive and PLC Touchscreen Control
The oilfield logging winch uses a 2.2 kW servo motor. The servo system works with a PLC and touchscreen to control the cable movement and present operating information to the operator.
The specified cable speed is 0.4-0.8 m/s with continuous adjustment. A variable speed range allows the operator to select a suitable payout or retrieval rate for the current logging task. The control system supports manual and automatic modes according to the project parameter table.
The servo drive also gives the system a way to coordinate cable movement with depth and tension feedback. Motor selection, gearbox ratio, drum diameter, cable mass, and instrument load should be reviewed together before a final operating limit is approved.
Automatic Cable Spooling with a Reciprocating Screw
The drum is equipped with an automatic cable guide driven by a reciprocating screw. The guide moves across the drum and places the cable in an orderly pattern during payout and retrieval.
This arrangement helps reduce cable crossover, local pressure, and loose winding. It also supports repeatable cable placement when the drum is used over multiple cycles. The guide dimensions must match the cable diameter, drum width, groove arrangement, and minimum bending radius. These relationships should appear on the approved drum and cable-guide drawings.
For a wireline logging winch, orderly spooling protects the cable and helps keep the cable path predictable. It also gives the operator a more stable basis for length and tension monitoring.
Encoder and Load-Cell Monitoring
The cable guide integrates an encoder and a load cell. The encoder provides payout-length information, while the load cell measures cable tension. The PLC touchscreen displays the collected values for the operator.
This arrangement gives the operator direct information about two variables that affect the logging procedure: how much cable has been deployed and how much tension the line is carrying. Alarm thresholds can be configured according to the project control strategy, provided that the sensor range, calibration method, and PLC logic are approved.
The case does not provide a calibration certificate or a measurement-accuracy figure. Those values should be added only when the final sensor documentation and acceptance records are available.
Optoelectronic Slip Ring for Composite Cable
The drum shaft integrates an optoelectronic slip ring for the composite cable. A slip ring transfers circuits between rotating and stationary equipment, allowing the drum to rotate while maintaining the required connection.
In this application, the interface supports both power and optical signal transmission. The final selection should match the cable construction, circuit count, voltage, current, optical interface, data protocol, shielding, and allowable rotational speed.
The slip ring is part of the complete cable system. Cable bend radius, drum diameter, winding direction, connector arrangement, grounding, and inspection access must be checked together before production.
Manual Mobility at the Well Site
Swivel casters are installed at the bottom of the machine. They allow personnel to push the unit into position after it has been unloaded and prepared for the operation.
This feature supports the project requirement for field mobility. Site access, floor condition, slope, clearance, lifting points, and handling procedures remain part of the installation review.
Wireline Logging Winch Technical Parameters
The following table presents the KLD-CLG-150 values supplied for this case. The values describe the project configuration and should be read with the approved cable specification and final technical drawings.
| Parameter | Project value |
| Model | KLD-CLG-150 |
| Project-defined instrument load | 150 kg downhole instrument mass in this case |
| Motor power | 2.2 kW servo motor |
| Cable speed | 0.4-0.8 m/s, continuously adjustable |
| Cable capacity | 213 m |
| Drum diameter | 150 mm |
| Gear ratio | 40:1 RV aluminum gearbox |
| Machine self-weight | 150 kg or less |
| Dimensions | 1095 x 730 x 725 mm |
| Control | PLC and touchscreen, manual and automatic modes |
| Special equipment | Optoelectronic slip ring, load cell, encoder |
Before ordering a similar electric wireline winch, confirm that the project-defined 150 kg instrument mass is compatible with the final allowable line pull and lifting rating. Confirm the 213 m cable capacity against the actual cable diameter, mass per metre, minimum bending radius, and reserve length.
Where Can This Lightweight Wireline Winch Be Used?
The documented application is oilfield wireline logging. The same design approach can be assessed for mineral exploration, hydrogeological investigation, and other field operations that need mobile equipment, controlled cable movement, cable-length measurement, and composite-cable power or signal transmission.
Each application requires its own review. Instrument weight, well depth, cable type, cable diameter, payout speed, tension range, control method, and site mobility can change the drum, drive, sensor, and guide requirements. Environmental claims should also be tied to the actual material, coating, storage, and field conditions.
What Should Buyers Check Before Ordering a Custom Logging Winch?
A practical RFQ should include the information below:
- Downhole instrument mass and required line-pull definition
- Required well depth and cable length
- Cable construction, diameter, mass per metre, and minimum bending radius
- Required payout and retrieval speed
- Expected cable tension range and alarm limits
- Power circuits, signal circuits, optical interface, and data protocol
- Drum diameter, cable capacity, and available installation space
- Manual, automatic, or combined control mode
- Site movement method and access constraints
- Inspection, calibration, and acceptance-test requirements
The cable datasheet is particularly important. A composite cable can combine power, copper signal, and optical elements, and each part can impose a different bend or tension limit. The winch supplier should review the cable, drum, slip ring, sensors, and control logic as one package.
Why Work With KLD on a Custom Wireline Winch?
KLD designs and manufactures industrial winches for specialized applications. Its documented product range includes cable winches, servo winches, mining winches, explosion-protected winches, marine equipment, synchronous winches, and other application-specific systems. The company’s project materials cover petroleum, mining, port machinery, offshore equipment, power facilities, and other industrial environments.
For a mobile oilfield logging system, the relevant deliverable is an engineering package that connects the cable data to the drum, drive, guide, sensors, slip ring, controls, and field handling method. You can review the supplier’s industrial winch capability and submit the operating requirements for a project-specific review.
FAQ
Q1: What is the project-defined instrument load of the KLD-CLG-150 wireline logging winch?
A: The project parameter table lists a project-defined downhole instrument mass of 150 kg. The final allowable line pull and lifting rating must be confirmed in the approved design documents.
Q2: How light is this oilfield logging winch?
A: The specified machine self-weight is 150 kg or less. The final machine self-weight should include the approved machine configuration and any optional parts that will be used at the well site.
Q3: Can the winch monitor cable length and tension in real time?
A: Yes. An encoder measures payout length and a load cell measures cable tension. The PLC touchscreen displays the collected values. Sensor range, calibration, and alarm settings require project approval.
Q4: Does the system support power and signal transmission through a composite cable?
A: The drum includes an optoelectronic slip ring designed for the composite cable’s power and optical signal circuits. The final interface must match the cable construction, circuit requirements, data protocol, and operating conditions.
Q5: What information is needed to customize a wireline logging winch?
A: Provide the instrument mass, cable length and datasheet, cable diameter, minimum bending radius, speed range, tension range, power and signal requirements, drum space, site movement conditions, control preference, and acceptance-test requirements.
If you need a lightweight wireline logging winch for oilfield logging, mineral exploration, or hydrogeological work, submit the cable datasheet and operating conditions for a custom review. The correct design begins with the complete cable, instrument, depth, speed, tension, and field-mobility requirements.
