A comprehensive experimental platform for pipe string mechanics that can be used indoors

Abstract

The invention discloses an indoor comprehensive pipe string mechanics experiment platform, which solves the problem that the existing indoor experiment devices cannot accurately and synchronously apply tension, compression, bending, torsion and other loads. The device integrates the loading and testing mechanism of different loads such as tension, compression, bending, torsion, etc., and uses the bearing isolation method to eliminate the mutual influence of combined tension and torsion loading. Signal acquisition and processing. This device can realize simultaneous loading and testing of tension, compression, bending, torsion and other loads. According to the actual use of the oilfield string, each part is scaled to obtain the real deformation of the oilfield string under a given load.

Description

technical field [0001] The invention relates to an experimental research device applied in the technical field of pipe string mechanical behavior research. Background technique [0002] The length-to-diameter ratio of the oilfield tubing string is extremely large, the annular gap between the oil casing and the casing is extremely small, and the downhole load is also extremely complicated. The deformation of the tubing string in the downhole is often a combination of contact and friction boundaries, and is affected by the The result of a combination of tensile (or compressive) and bending loads and torques. Therefore, the tubing will often buckle in the casing, and the buckling deformation of the tubing will cause the axial position of the packer, water distributor and other components installed on the tubing to move in series, resulting in the injection-production cascade and even the failure of downhole tools. At present, the oilfield site can use the magnetic positioning ...

AI Technical Summary

Problems solved by technology

Therefore, the tubing will often buckle in the casing, and the buckling deformation of the tubing will cause the axial positions of the packers, water distributors and other components installed on the tubing to move in series, resulting in injection-production cascading and even downhole tool failure.

At present, the oilfield site can use the magnetic positioning method to measure the position series movement of each component before and after the pipe string works, but the magnetic positioning method cannot predict the position series movement of each component in the working state before the pipe string is run in.

[0003] In order to study the deformation of the pipe string under complex working conditions downhole, many foreign scholars (such as Lubinski, Hammerlindl etc.) based on theoretical basis respectively, established a series of research theories and auxiliary experimental methods of pipe string mechanics under different conditions, but these research theories generally ignore a certain force or boundary condition of the pipe string, and need to be given It is only approximately true when the assumption is true, and the deformation of the pipe string under actual working conditions cannot be comprehensively and accurately given; moreover, due to the complexity of the pipe string buckling phenomenon itself, it is usually difficult to analyze in many auxiliary experiments such as end However, the independent influence of internal boundary constraints, pipe string length, friction and other factors on the pipe string buckling, and the lack of detailed error analysis of the experimental results, all of which affect the credibility of the experimental results for the corresponding theoretical support, while the above-mentioned The reason for the difficulty is that most of the existing experimental devices conduct special research on the deformation of a certain type of pipe string under a certain type of load, and it is impossible to accurately apply tension (compression), bending torsion, hydraulic pressure, friction, etc. simultaneously. Load, so as to study the real stress and deformation of the pipe string in the downhole

The deformation of the pipe string in the downhole is the result of the joint action of tension (compression) bending torsion, hydraulic pressure, friction, etc. The comprehensive experimental device for the study of the mechanical behavior of the pipe string under the real stress environment in the downhole has not yet been established.

[0004] The deformation of the pipe string not only affects the safe production of the oil field, but also causes serious economic losses to the oil field. This requires us to propose a method that can accurately and synchronously apply tension (compression), bending torsion, hydraulic pressure, friction and other loads, and can simulate the pipe string. The indoor experimental device in the real stress environment of the underground, and then conduct research on the above problems

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