A test device for bending fatigue life of coiled tubing

Abstract

The present invention provides a test device for the flexible life of a coiled tubing. The device comprises a motor, a crank, a first rotating hinge, a connecting rod, a first hydraulic rod, second rotating hinges, a coiled tubing, a clamp, an air inlet, a second hydraulic rod, a first support, a second support, a third support, a crossbeam and a connection shaft. The crank, the connecting rod and the coiled tubing form a crank and rocker mechanism; the first hydraulic rod and the second hydraulic rod which are configured to apply tension load to the coiled tubing are able to rotate around the second rotating hinges and drive the coiled tubing to rotate back and forth along the swing locus; the air inlet is configured to apply internal pressure to the coiled tubing; the motor is started, the crank is configured to drive the coiled tubing under the action of internal pressure and the tension load to do reciprocating motion along the swing locus, and the degree of crook and the angle of the swing locus of the coiled tubing are changed by changing the length of the crank, so that the flexural fatigue characteristic test of the coiled tubing in different conditions are realized. The test device for the flexible life of a coiled tubing is suitable for the field of the petroleum and natural gas drilling and production engineering technology.

Description

Technical field: [0001] This patent relates to the technical field of oil and natural gas drilling and production engineering, in particular to a test device for bending fatigue life of coiled tubing. Background technique [0002] Coiled tubing has irreplaceable advantages because it is different from conventional drill pipes and tubing in terms of materials, operating techniques and equipment, making it develop rapidly in drilling, workover, completion, logging, oil production and other application fields. Exploration and development are playing an increasingly important role, and the research on mechanical problems related to coiled tubing operation technology is also rapidly following up. Coiled tubing also has significant advantages and application values ​​such as small diameter, good flexibility, under-balanced operation with pressure, fast and efficient operation, and low cost. However, based on the working principle of coiled tubing (when coiled tubing is working, i...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coiled tubing bending fatigue life testing device to solve the technical problem that the coiled tubing bending fatigue life is difficult to predict in the real wellbore environment. The device is simple and convenient to operate and can easily meet different wellbore environments. real conditions under

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