Oil Casing Pipe Gas Seal Detection Technology and Development Status

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    Summary

    1.Casing pipe gas seal detection technology 2.Development status of oil casing pipe

    Press Release

    Oil casing pipe gas seal detection technology principle and process
    Principle: The tightness of the oil casing buckle is closely related to the pressure and medium. The pressure and medium molecular size are different, and the permeability is different. The gas is more difficult to seal than the liquid.
    The principle of gas seal detection technology is to use the low molecular gas medium to test the gas seal performance of the oil casing buckle under the allowed high pressure conditions.

    Process:
    Inserting a test tool with a double packer into the column, sealing it up and down at the threaded joint, then injecting high-pressure nitrogen and ammonia mixed gas into the middle sealed space, and detecting it outside the thread with a high-sensitivity helium detector. To determine if a leak has occurred.

    Development status of oil casing pipe

    With the development of oil well gas drilling operations to more severe working conditions such as deeper, higher pressure and higher temperature, and the continuous improvement of oil drilling technology, conventional oil casing pipe threads are difficult to meet the development needs of oil fields.

    At present, there are more and more high-pressure oil and gas wells. The ordinary API threaded tubing can not meet the requirements of high-pressure sealing. For oil and gas wells with pressure higher than 28MPa, most of them choose gas-tight special buckle type tubing. As more and more H2S/CO2/Cl- containing oil and gas wells will be put into development, ordinary low-carbon low-alloy steel tubing cannot adapt to harsh corrosive environments, and the service life of tubing cannot meet the design requirements of oil and gas wells, so 9Cr, 13Cr. The application of corrosion-resistant material tubing such as 22Cr and 25Cr is also becoming more and more extensive.