Drilling simulation device of buckling tubular column in variable-diameter borehole

Abstract

The invention provides a drilling simulation device of a buckling tubular column in a variable-diameter borehole. The device is characterized in that a power device is used for driving a hollow drillcolumn to rotate; a simulation borehole is a hollow pipe; a plurality of variable diameter devices are arranged on a surface of an outer wall of the simulation borehole and are used for expanding andreducing a diameter of the simulation borehole; the hollow drill column, a drill collar, a sensor and a drill bit are all arranged in the simulation borehole; the hollow drill column, the drill collarand the drill bit are connected in sequence, and the sensor is arranged on the drill bit; a rock plate is arranged at a bottom of the simulation borehole; a rack is arranged around the outer wall ofthe simulation borehole, and the power device is fixed above the simulation borehole through the rack; and a control system is further arranged on the rack and used for making the multiple variable diameter devices carry out diameter expanding or reducing on a local portion of the simulation borehole. According to the device, simulation of a rotation process of the buckling tubular column in the diameter expanding and reducing borehole can be realized, and the influence of diameter expanding and reducing on a motion state of the drilling tubular column is obtained.

Description

technical field [0001] The invention relates to the field of drilling engineering manufacturing, in particular to a drilling simulation device for buckling pipe strings in variable-diameter boreholes. Background technique [0002] During the drilling process, the drill bit is turned through the formation to create the borehole, passing through many different types of formations with different physical properties in the process. Before cementing, the drilling fluid is fully in contact with the open-hole formation, which changes the physical properties of some formations. [0003] In addition, due to the stress change caused by drilling, the stress around the wellbore is unstable. The above reasons make the wellbore in some formations gradually increase or decrease. Severe expansion and contraction are not good for drilling. When the diameter of the wellbore expands, the wellbore wall will be unstable, and in severe cases, even local wellbore walls will collapse and accident...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned problems in the prior art, the present invention provides a drilling simulation device for buckling pipe strings in variable-diameter boreholes, which solves the problem of failure to know the influence of diameter expansion or contraction on the movement state of the drilling pipe string in the prior art. accident problem

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