Hydraulic Control Line

Description of Usage

Hydraulic control lines, also known as capillary tubing, are primarily used for downhole pressure monitoring in oil and gas fields. In this application, a temperature and pressure sensor (commonly known as a downhole permanent pressure gauge, typically a nitrogen-charged bellows type) is run into the wellbore alongside the production tubing to the target reservoir depth, which can be several kilometers underground. The hydraulic control line (capillary tubing) is then connected from the downhole sensor all the way to a surface fluorescent display unit. This setup allows the downhole temperature and pressure data to be transmitted to the surface through the capillary tubing, where the instantaneous temperature and pressure at the reservoir level can be read on the surface monitor's fluorescent screen, enabling real-time monitoring of downhole conditions.

Hydraulic control lines are also used for chemical injection in oil and gas wells. In this application, the hydraulic control line is connected to a downhole chemical injection valve. Through the hydraulic control line and the chemical injection valve, descaling agents or other chemical treatments are injected from the surface into the production tubing at a specific depth downhole. This effectively removes scale buildup in the tubing and ensures normal oil and gas production.

Additionally, hydraulic control lines can be used for pressure control of surface safety valves and other surface valves, as well as for various connection lines in instrumentation control systems for large-scale drilling and production equipment in oil and gas fields.

Note: Materials and specifications can be customized according to user requirements.

Technical Specifications

• Pipe Material: 316L, 310S, 2205, 304, 825, 625, etc.

• Wall Thickness: 0.8mm – 1.65mm

• Outer Diameter (OD): 1/8" – 1/2"

• Length: 500m – 10,000m

• Pressure Rating: 50MPa – 120MPa

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