Tubing and Casing Thread Gas-tight Sealing Testing



Service content: Use helium (or a mixture of helium and nitrogen) to check the thread tightness of the oil and casing joints.

Use a winch to lower the special packer to the joint of the oil and casing, and then transport 35-105Mpa high pressure helium gas, and detect the helium molecules through the detection instrument outside the coupling. If helium molecules are detected that means the coupling sealing performance is defective.if the helium molecules are not detected, the coupling sealing performance is good.


Detection principle:

Medium (He)

The molecular weight of helium (He) in nature is only larger than that of hydrogen (H2), but its chemical and physical properties are more stable than hydrogen, and the content of helium (He) molecules is very low in the natural atmosphere. So by pressing the helium, you can detect very small leaks.


Pressure (105mPA)

Oil and casing in the production well need to withstand the pressure from stratum.Using the method of simulating downhole pressure, a high pressure is generated to detect the sealing performance of the coupling.


Volume (3L)

Gas has a strong compression capacity, in order to improve work efficiency and save cost, the packer is used to seal the coupling position.


The Winch

Uses a winch to quickly lift the packer to the coupling position.



Equipment Composition

1)Air power unit



 2)Booster unit



3)Compounding instrument









1)Safety - the exploration gas in the detection is inert gas, the carrier gas nitrogen is inactive gas, the helium gas is lighter than air, safe to use, helium and nitrogen are non-corrosive, no damage to the human body and the detection object .

2)Reliability - due to the small diameter of the helium molecules, easy to penetrate in the gas seal buckle.

3) Sensitivity - The helium leak detector has high sensitivity and can detect helium gas with a leak rate of 1×10-7 bar·ml/sec, that is, it can be detected as long as helium leaks.

4)Fast operation – the detection speed is fast, and the average detection speed is 2 minutes, which has little impact on the completion process.

(5) Wide application range - detection range: 2-3/8′′ 2-7/8′′, 3-1/2′′, 4-1/2′′, 5′′, 5-1/2”, 7′′ ;FOX, BGT, VAM and other conventional threaded oil casings; gas tree, gas pipeline, etc.

On-site operation