An external oil casing gas seal detection device and detection method

Abstract

The invention discloses a built-out type oil casing air-tight seal detection device and detection method and belongs to the field of oil casing joint seal detection in oil exploitation. The device comprises an outer pipe column, and the upper end and the lower end of the outer pipe column are provided with an upper end cover and a lower end cover respectively; an upper central pipe, a valve seat and a lower central pipe are arranged inside the outer pipe column, and the upper central pipe is connected with the lower central pipe through the valve seat, wherein side holes are formed in the side wall of the upper central pipe and the side wall of the lower central pipe; an upper sliding sleeve is arranged at the inner side of the upper central pipe, the upper sliding sleeve corresponds to the side hole of the upper central pipe and is capable of sliding relatively, and a telescopic upper rubber sleeve is configured between the upper sliding sleeve and the upper end cover; a lower sliding sleeve is arranged at the inner side of the lower central pipe, the lower sliding sleeve corresponds to the side hole of the lower central pipe and is capable of sliding relatively, and a telescopic lower rubber sleeve is configured between the lower sliding sleeve and the lower end cover. In the working process, the device is located outside an oil casing joint, a gas detector is used for detecting gas at the inner wall of the an oil casing, air impermeability of the oil casing is judged by detecting whether the gas leaks or not, and the problem of air-tight seal detection for small-size oil casings is effectively solved.

Description

technical field [0001] The invention relates to the field of detection of oil casing coupling seals in petroleum exploitation, in particular to a threaded air tightness detection device for small and medium-sized casings used in oil and gas exploration and development, in particular to an external oil casing gas seal detection device . Background technique [0002] With the development of exploration and development technologies such as deep wells and horizontal wells, higher requirements are put forward for drilling and completion, injection and production processes, etc. During the production process, the wellhead pressure continues to increase, and some wellhead pressures have even reached 100MPa. If the airtightness of the threaded connection of the oil and casing fails, it will cause huge economic losses and serious environmental pollution. In order to ensure the safe production of oil and gas, various oil and gas fields have higher and higher requirements for the airt...

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Problems solved by technology

[0004] The purpose of the present invention is to: aim at the above-mentioned problems, to provide an external oil casing gas seal detection device and detection method, which is placed outside the oil casing coupling during operation, and the gas detector on the inner wall of the oil casing is used to monitor the gas Carry out testing, and judge the airtightness of the oil casing by detecting whether the gas leaks, which effectively solves the problem of air tightness detection of the small size oil casing

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