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The introduction to this article provides insufficient context for those unfamiliar with the subject.Please help improve the article with a good introductory style. (January 2009)
Slickline is a term for a tool of conveyance used generally in oil and gas well servicing. Slickline looks like a long, smooth, unbraided wire, often shiny, silver/chrome in appearance. It comes in varying lengths, according to the depth of wells in the area it is used (it can be ordered to specification) up to 35,000 feet in length. Slickline is spooled onto a hydraulically controlled drum in the back of a wireline truck. The wireline truck is driven out to the wellsite, and specialized equipment designed to keep high pressure and well fluids contained, while allowing the slickline to run deep down the hole of the oil/gas well is 'rigged up'. Downhole tools, which are long, and tubular shaped, with various mechanisms on them, are lowered via the slickline to the appropriate depth, whereupon they carry out their tasks. The operator of the wireline truck controls the drum at surface, monitoring the depth which is measured from a surface point, and the weight, which informs the operator via a sensitive gauge attached to the wire what is happening downhole. Upon completion of that step of the job, they are pulled back to surface via the slickline, which generally stays attached to the 'toolstring'. Slickline comes in different grades, meant to maintain a balance between being strong enough to support the weight of itself, the toolstring, and restrictions encountered downhole without breaking, and also corrosive and dangerous gases and fluids that occur in oil and gas wells. Shiny slickline (ie: 316 Stainless Steel, GD 31 Molybdenum), depending on the metalurgy, is generally used for more corrosive wells, or wells with H2S poisonous gas, or CO2, which can drastically affect metal performance. Dark grey slickline (ie: plow steel), which has the colour of a new, grey nail, but which rusts easily, generally has a higher strength than the more exotic metalurgies of the same diameter; however, it is more adversely affected by bad well conditions and therefore is usually only used in 'sweet' wells. As well depths have increased over the years since the first measuring lines were brought into use, accompanied by increased working loads, it has become necessary to develop wireline having a high strength/weight ratio. This is known as slickline. There is a need for strength to accomplish the operation without the wire breaking, and a need to keep the diameter of the wire as small as possible for the following reasons:
It reduces the load of its own weight
It can be run over smaller diameter sheaves, and wound on smaller diameter spools or reels without overstressing by bending
It keeps the reel drum size to a minimum
It provides a small cross-section area for operation under pressure
The sizes of solid wireline in most common uses are: 0.108ins and 0.125ins diameter, and are obtainable from the drawing mills in one-piece standard lengths of 18,000, 20,000, 25,000 and 30,000 ft.
Contents
1 Uses
2 Braided line
3 Slickline Tools
3.1 Jar
3.2 Stem
3.3 Pulling tools
3.4 Gauge cutter
3.5 Lead impression block
3.6 Bailer
3.7 Running Tools
//
Uses
Slickline tools operate with a mechanical action, controlled from surface in the wireline trucks operators compartment. Typically, this mechanical action is accomplished by the operation of jars. There are generally two types of jars, mechanical and hydraulic. Mechanical jars look like a long, tubular piece of machined metal that slides longer or shorter approximately 75% to 90% of its total length. They give the effect of hammering on the downhole tools. The weight or hit of the 'hammer' depends on how much sinker bar is added above the jars. Generally, a slickline operator controls the downhole tools with taps and hits from the sinker bar via the mechanical jars, controlled at surface by lowering or raising the toolstring and monitoring weight, depth, and pressure. Mechanical jars for slickline can hit up or down the hole, making them a versatile form of jarring. Hydraulic jars for slickline are generally meant to jar up only, because not enough sinker bar is able to feasibley lubricated in to jar down on the downhole tools. Hydraulic jars work by the operator pulling up on the line, which puts an upward force on the top of the hydraulic jars. The bottom of the hydraulic jars is usually attached by threaded connection to the mechanical jars, which are attached to the downhole tools. Depending on how hard the operator pulls on the hydraulic jars will affect how fast they hit, and how hard they hit. when the top is pulled on, the inner mandrel begins to slide upwards. It has a restriction on it, that hydraulic fluid has to bypass as it is pulled upwards, until it...(and so on)

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