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In the oil and gas industry, coiled tubing refers to a long metal pipe, normally 1 to 3.25 in (25 to 83 mm) in diameter which is supplied spooled on a large reel. It is used for interventions in oil and gas wells and sometimes as production tubing in depleted gas wells. Coiled tubing is often used to carry out operations similar to wirelining ...
Coiled Tubing Drilling (CTD) is a drilling method that combines coiled tubing and directional drilling. [1] [2] It uses a mud motor to create a system for reservoirs.
This sand can lodge on top of a packer or coil tubing in the well sticking the pipe. Tubing Stuck in Production Wells. Tubing in production wells is often exposed to a number of highly corrosive chemicals, such as H 2 S. [1] This corrosion can deteriorate the tubing to the point that it separates from the wellhead causing the tubing to fall ...
Coiled tubing is run in hole with a jetting tool on the end. When the tool is at its target, the chemical is pumping through the pipe and is jetted directly onto the damaged area. This can be more effective than pumping from surface, though it is much more expensive, and accuracy is dependent on knowing the location of the damage.
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Coiled tubing is used when it is desired to pump chemicals directly to the bottom of the well, such as in a circulating operation or a chemical wash. It can also be used for tasks normally done by wireline if the deviation [ clarification needed ] in the well is too severe for gravity to lower the toolstring and circumstances prevent the use of ...
Well completion is the process of making a well ready for production (or injection) after drilling operations. This principally involves preparing the bottom of the hole to the required specifications, running in the production tubing and its associated down hole tools as well as perforating and stimulating as required.
The valve at the top is called the swab valve and lies in the path used for well interventions like wireline and coiled tubing. For such operations, a lubricator is rigged up onto the top of the tree and the wire or coil is lowered through the lubricator, past the swab valve and into the well. This valve is typically manually operated.
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