Coiled tubing umbilicals are a type of piping used in and gas wells

Oil well

An oil well is a general term for any boring through the earth's surface that is designed to find and acquire petroleum oil hydrocarbons. Usually some natural gas is produced along with the oil. A well that is designed to produce mainly or only gas may be termed a gas well.-History:The earliest...

, which can be used during interventions

Well intervention

A well intervention, or 'well work', is any operation carried out on an oil or gas well during, or at the end of its productive life, that alters the state of the well and or well geometry, provides well diagnostics or manages the production of the well....

. They encapsulate multiple coiled tubing

Coiled tubing

In the oil and gas industries, coiled tubing refers to metal piping, normally 1" to 3.25" in diameter, used for interventions in oil and gas wells and sometimes as production tubing in depleted gas wells, which comes spooled on a large reel. Coiled tubing is often used to carry out operations...

 and electrical strings into a single string which can be deployed by one conventional unit. These technologies allow for the deployment of complex pumps on coiled tubing. Multiple strings in a casing may maintain a manageable shape for the tubing and eliminating the danger of ovalization.