Mechanical analysis method for putting coiled tubing into horizontal well

Abstract

The invention discloses a mechanical analysis method for putting a coiled tubing into a horizontal well, which comprises the following steps of: according to a well track and a stress balance condition of a coiled tubing infinitesimal, calculating a synthetic internal force after internal and external pressure equivalent action of the coiled tubing, a synthetic external force per unit length of the coiled tubing, a concentrated internal torque of the coiled tubing and a distributed external torque per unit length of the coiled tubing, and substituting the synthetic internal force, the synthetic external force, the concentrated internal torque and thedistributed external torque into the balance equation of the coiled tubing infinitesimal to obtain an axial load mechanical model of the coiled tubing of the horizontal well; and according to the buckling critical load of the coiled tubing and the result of solving the axial load mechanical model of the coiled tubing of the horizontal well, judging whether buckling behavior occurs when the coiled tubing is put into the horizontal well or not. When the horizontal well coiled tubing axial load mechanical model is established, the well track is considered, whether buckling behavior occurs when the coiled tubing is put into the horizontal well or not is judged more accurately, and it is guaranteed that the coiled tubing can be put into the horizontal well successfully.

Description

technical field [0001] The invention relates to the technical field of coiled tubing operations, in particular to a mechanical analysis method for running a coiled tubing into a horizontal well. Background technique [0002] Coiled tubing has the characteristics of low operating cost, high efficiency, convenient operation, and wide range. It is known as the "universal operating machine" in the petroleum industry. The application of coiled tubing in workover operations can often reduce costs, and the use of coiled tubing can reduce the number of operating equipment, especially on offshore platforms, which can often save the narrow operating area of ​​the platform and improve the operation of operating equipment. transfer efficiency. Coiled tubing is composed of flexible tubing strings welded one by one. Compared with conventional tubing strings, its rigidity is smaller. Buckling behavior is prone to occur during the process of coiled tubing running into the bottom of a horiz...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that whether the buckling behavior will occur in the process of running the coiled tubing into the horizontal well cannot be accurately judged, to provide a mechanical analysis method for running the coiled tubing into the horizontal well, and to prepare and judge whether buckling occurs before the coiled tubing is run into the horizontal well Behavior to ensure that the coiled tubing can be successfully run into the horizontal well

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