Choosing the Right Wireline Unit Logging Unit
If you're starting a wireline service company, or expanding an existing one, you need the right wireline unit logging unit. It's the core equipment of your business, and choosing the right one is essential. There are a lot of options out there, and it can be overwhelming. Truck mounted or skid mounted? What size? What features? Here's how to choose the right wireline unit for your operation.
Step 1: Truck Mounted or Skid Mounted?
The first decision is: truck mounted or skid mounted?
Truck Mounted. This is the most common type. It's mobile — you can drive it from well to well on public roads. It's self-contained — everything you need is on the truck. It's versatile — you can use it for all kinds of wireline jobs. If you're starting a wireline service company, a truck mounted unit is the way to go. It's the standard, and it's what most customers expect.
Skid Mounted. This is for specific situations — offshore platforms, permanent bases, remote locations, or heavy-duty work. It's not mobile, but it's more powerful and more flexible. If you need a unit for a specific application, a skid mounted unit might be the right choice. But if you're starting a mobile wireline service, a truck mounted unit is better.
Step 2: Choose the Right Pulling Capacity
The pulling capacity is the most important specification. How much pulling power do you need?
Small Units (10,000-20,000 lb pulling capacity). These are small, cheap units, for shallow wells and basic cased hole logging. They're good for shallow wells (1,000-2,000 meters) and basic logging work. They're less expensive to buy and operate, but they can't handle deep wells or heavy-duty work.
Medium Units (30,000-50,000 lb pulling capacity). This is the industry standard. They can handle most onshore wells — up to 3,000-4,000 meters deep, and they can do most wireline jobs — logging, swabbing, perforating, and more. If you're starting a wireline business, this is the sweet spot.
Big Units (60,000+ lb pulling capacity). These are big, high-power units, for deep wells and heavy-duty work — fishing, heavy swabbing, and more. They're more expensive, but they're the only way to handle deep wells (4,000+ meters) or heavy-duty work.
Step 3: Choose the Right Features
What features do you need? Here are some things to consider:
- Wireline vs. slickline: Wireline has electrical conductors, so you can send power and signals downhole. Slickline is just solid wire, no conductors. Most logging work needs wireline, because you need to power the logging tools. Slickline is simpler and cheaper, for basic swabbing and mechanical work.
- Computerized controls: Modern wireline units have computerized control systems, which let you monitor and control the speed, the tension, and everything else. They also log all the data.
- Data acquisition system: If you're doing logging work, you need a data acquisition system to record the logging data. That's essential for logging work.
- Truck chassis: What kind of truck chassis do you need? If you're driving on paved roads, a 4x2 truck is enough. If you're driving on rough oilfield roads, you need a 4x4 or 6x6 truck.
Step 4: New or Used?
New wireline units come with a warranty, and you know exactly what you're getting. But they're expensive. Used wireline units are 40-60% cheaper, but you have to inspect them carefully. Bring an experienced wireline operator or a mechanic with you to inspect any used unit before you buy.
FAQ
Q: How many wireline units do I need to start a wireline service company?
A: If you're just starting out, one wireline unit is enough. As you get more customers, you can add more units. Most small wireline service companies start with 1-3 units, and then expand as they grow.