How Do Control Lines Work In Wells?

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How Do Control Lines Work In Wells?

May 15
09:03 2024

Control lines enable the transmission of signals, allow downhole data acquisition, and permit control and activation of downhole instruments.

The command and control signals can be sent from a location on the surface to the downhole tool in the wellbore. Data from downhole sensors can be sent to the surface systems for evaluation or use in certain well operations.

Downhole safety valves (DHSVs) are surface controlled sub-surface safety valves (SCSSV) hydraulically operated from a control panel on the surface. When hydraulic pressure is applied down a control line, the pressure forces a sleeve within the valve to slide down, opening the valve. On releasing the hydraulic pressure, the valve closes.

Meilong Tube’s downhole hydraulic lines are used primarily as communication conduits for hydraulically operated downhole devices in oil, gas, and water-injection wells, where durability and resistance to extreme conditions are required. These lines can be custom configured for a variety of applications and downhole components.

All encapsulated materials are hydrolytically stable and are compatible with all typical well completion fluids, including high-pressure gas. The material selection is based on various criteria, including bottomhole temperature, hardness, tensile and tear strength, water absorption and gas permeability, oxidation, and abrasion and chemical resistance.

Control lines have undergone extensive development, including crush testing and high-pressure autoclave well simulation. Laboratory crush tests have demonstrated the increased loading under which encapsulated tubing can maintain functional integrity, particularly where wire-strand “bumper wires” are used.


Where are control lines used?

• Intelligent wells requiring the functionality and reservoir management benefits of remote flow-control devices because of the costs or risks of interventions or an inability to support the surface infrastructure required in a remote location.

• Land, platform, or subsea environments.


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