Wireline
Wireline enables many downhole operations to be conducted efficiently and cost effectively under 'live' well conditions. Improvements in manufacturing processes, maintenance and increasing wire / cable diameters has ensured increased reliability and performance despite increasing well depths, temperatures and pressures in which the wireline must work under.
Wireline enables many downhole operations to be conducted efficiently and cost effectively under 'live' well conditions. Improvements in manufacturing processes, maintenance and increasing wire / cable diameters has ensured increased reliability and performance despite increasing well depths, temperatures and pressures in which the wireline must work under.
Slickline
May be described as the 'workhorse' of well intervention, certainly the cheapest, it is robust and relatively simple to conduct and operate. The key factor in slickline is that it can be performed under 'live' well conditions.
Equipment:
Equipment required to conduct slickline operations normally consist of:
- Alloy or Stainless Steel wireline (piano wire) normally sized 108" diameter or 0.125" diameter
- Winch unit capable of holding 25000ft of wire
- Diesel or Electric power pack
- Well Control Panel
- Pressure control Equipment comprising - Lubricator / Stuffing Box / BOPS / Riser
- Tool house holding downhole tools & running equipment
Applications:
Slickline can be used to run, set and recover various tools, plugs, packers, valves to the well bore in order to perform:
- Repair work - change-out faulty safety valves / gas lift valves
- Surveillance - conduct pressure / temperature surveys, downhole camera diagnostics
- Isolation: Plug off water zones, hydrocarbon or gas zones, prepare well for workover
- Manipulation work: Open sliding sleeve assemblies, clear blockages, cut and remove wax build up
One of the most recent advances in slickline is the integration with telemetry systems to widen the range of applications.
E-line
Most commonly used in well logging, perforating and well surveillance activities; real time data is obtained through the electric cable and provides accuracy of depth control and well information. Normally performed under 'live' well conditions.
Equipment:
The equipment required to conduct electric line operations consist of:
- Mono conductor cable which can be supplied from 7/32" - 7/16"
- Winch unit capable of holding up to 25,000ft of wire
- Diesel or Electric Powerpack
- Well Control Panel
- Grease injection pump unit
- Pressure control equipment comprising Lubricator / Grease injection head / BOPS /Riser
- Logging /Data centre for storing / analysing data during the operation (this unit may form part of the winch unit)
- Tool house holding logging tools and equipment
Applications:
Electric line can be used for many applications but predominantly well logging activities such as:
- Cased Hole Logging - Production logging to determine zonal contributions, water or gas influxes, permeability and porosity measurement
- Open Hole Logging - Reservoir monitoring, Resistivity measurement, formation testing
- Perforating - casing and tubing perforation operations
- Explosive Devices - Setting packers, plugs and straddles
- Drilling Support Services - Explosive back off operations to free stuck drillpipe
Braided Line
Adapted as a form of "heavy duty" wireline service, braided cable can be used to deploy heavy toolstrings and particularly in well fishing operations where large impact forces can be applied to stuck toolstrings, plugs or flow control devices.
Equipment:
The equipment used is the same as electric line operations.
Applications:
The main application for braided line operations include:
- Fishing - Where large impact forces are required to free stuck equipment
- Heavy Duty Operations - Deployment of large & heavy toolstrings or downhole equipment