Downhole fish detection method and device therefor based on flexible-array type pressure sensor

Abstract

The invention relates to a downhole fish detection method and device therefor based on a flexible-array type pressure sensor, pertaining to the technical field of workover treatment in oil fields. Thelower part of a weighting block is connected with a downhole vertical driving mechanism through a connecting device. A downhole horizontal driving mechanism is fixedly connected with the interior ofa housing of the downhole vertical driving mechanism. The lower part of the downhole vertical driving mechanism is connected with a flexible-array type pressure sensing probe. A logging cable is connected with the upper part of the weighting block, penetrates through the downhole vertical driving mechanism to be connected with the flexible-array type pressure sensing probe. The downhole fish detection method and device therefor based on the flexible-array type pressure sensor have the following advantages: discharge and lifting are realized by a cable; downhole operation is short in working period so that time is saved and labor cost is reduced; contact-type detection is performed through the flexible-array type pressure sensing probe and a fish top; by means of a piezoresistive cantileverbeam sensing array, the piezoresistive cantilever beam sensing array can be imbedded into apolyimide insulating elastic film; and therefore, the device is high in reliability, compact in structure and convenient in operation.

Description

technical field [0001] The invention belongs to the technical field of oil field workover operations, and in particular relates to a downhole fish detection method and device, in particular to a downhole fish detection method and device based on a flexible array pressure sensor. Background technique [0002] The oil and water wells produced every year are shut down due to fish falling into the well, or the casing is broken due to rock fracture, resulting in serious losses. Therefore, workover operations such as salvage and jam removal are needed to restore the production of oil wells. The detection and identification of the shape and position of fish falling or broken casing downhole is the most important step. The detection accuracy provides an important guarantee for the success rate of subsequent workover operations. Assure. [0003] At present, the methods used to detect fish falling in the well mainly include contact traditional lead mold printing, ultrasonic imaging d...

Images