Testing apparatus for special threaded oil casing tightness monitoring under dynamic load working condition

Abstract

The invention relates to a testing apparatus for special threaded oil casing tightness monitoring under the dynamic load working condition. The testing apparatus is characterized by comprising a bracket; the bracket comprises a pedestal, a hydraulic end bracket base, a fixed end bracket base and a fixed bracket base, and two sides of the top of the pedestal are respectively provided with the hydraulic end bracket base and the fixed end bracket base; the hydraulic end bracket base is provided with a hydraulic stretching apparatus, the fixed end bracket base is provided with a gas source connector, and the gas source connector is connected with a gas source pressurizing device; the hydraulic stretching apparatus is fixedly connected with one end of a to-be-tested oil tube sample, and the other end of the to-be-tested oil tube sample is fixedly connected with the gas source connector; the pedestal is also provided with a vibrating loading apparatus; and a control system is respectively inelectrical connection with the hydraulic stretching apparatus, the vibrating loading apparatus, a first pressure sensor, a second pressure sensor, a frequency sensor, a displacement sensor, a temperature sensor and a heater. The testing apparatus provided by the invention can be widely used in the field of high-temperature high-pressure oil-gas well oil casing tightness detection.

Description

technical field [0001] The invention relates to a test device for monitoring the tightness of special threaded oil casing pipes under dynamic load conditions, and belongs to the field of gas seal detection of oil casing pipes in high temperature and high pressure oil and gas wells. Background technique [0002] In recent years, with the advancement and development of technology, offshore high-temperature and high-pressure oil and gas wells have been explored, developed and put into production. High temperature and high pressure oil and gas wells often use special threaded oil casings with better connection strength and sealing performance. However, due to the extremely harsh and complex conditions of high temperature and high pressure oil and gas wells, special threaded oil casing joints often bear various loads, which directly affect their connection and performance. Sealing performance. The special threaded oil casing joint adopts the contact sealing method between the me...

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Problems solved by technology

Researchers use the finite element method to simulate complex downhole working conditions, explore the connection and sealing performance of oil casing joints under different working conditions, and provide reference for the selection and use of special threaded oil casing joints, but there is a lack of effective experimental demonstration; The experimental research on the tightness of the pipe connection is mainly a full-scale test method, which is the main method to evaluate the performance of the oil-casing pipe joint, including air and water seal tests, mainly by pasting strain gauges on the joints, and exploring the stress of the joints under different load conditions. field distribution, etc.; the oil casing sealing reliability is not only affected by the complex load conditions and environment downhole, but also the processing quality, transportation, make-up quality, and thread compound use of the oil and casing are also the main influencing factors. The influence of these factors can be effectively ruled out by testing the tightness before going into the well. The device commonly used for testing the gas seal of the wellhead of the tubing and casing is a helium gas seal detection device. A sealed space is formed by using a packer inside the tube and filled with helium of sufficient pressure. Helium gas leakage is detected on the outside. This method can effectively detect the sealing performance, but it still cannot avoid the leakage after the tubing and casing go downhole. It cannot detect the change of contact stress at the thread and sealing contact surface, and cannot judge the make-up. Whether it is qualified or not, it cannot guarantee that the contact stress of the sealing surface of the tubing and casing can still achieve the sealing effect when the downhole bears complex loads

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