Experimental method for simulating dynamic mechanics characteristic of underground drilling rig of air well drilling

Abstract

The invention discloses an experimental method for simulating dynamic mechanics characteristic of underground drilling rig of air well drilling, which is characterized in that a rotary system is arranged on the upper part of a derrick to provide rotary torque and drilling torque for a drill stem; the bottom of a drill is provided with an excitation system to provide drilling pressure and a randomvibration excitation signal; the sizes of the drill stem, a shaft and the drill are selected according to on-site common well body structure size by the similarity principle; the shaft is provided with a monitoring system, drilling well fluid medium flow state observation and the dynamic mechanical behavior measurement while drilling of the drilling rig can be carried out in a simulated drilling process; each system is fixed on a positioned derrick with a rotatable angle to regulate the inclining angle of the derrick, and thus the dynamic mechanics characteristic simulation experiment of the drilling rig can be realized at different well inclining angles. The experimental method is suitable for the dynamics research of underground drilling rigs of petroleum and natural gas.

Description

technical field [0001] The invention relates to an experimental method for dynamic mechanical characteristics of downhole drilling tools under real drilling conditions in the process of simulating air drilling. Background technique [0002] Air drilling refers to the drilling technology that uses air or gas as the circulating medium to carry cuttings. It is mainly used to improve the ROP of non-reservoir sections and prevent lost circulation in non-reservoir sections. This technology has been recognized by domestic and foreign drilling circles as a practical drilling technology to increase drilling speed, shorten drilling cycle and reduce drilling cost. However, compared with drilling fluid drilling, serious drilling tool failure is one of the serious problems caused by air drilling. [0003] During air drilling, the damping and vibration reduction effect of the gas is small, the vibration of the drilling tool is more severe, and the collision between the drilling tool and ...

AI Technical Summary

Problems solved by technology

Due to the different wellbore sizes in each oilfield and the large variation range of drilling parameters, the measured data are bound to vary widely and cannot be compared with each other

However, most of the existing indoor simulation experiment devices are simple devices built by using engineering plastics to simulate the drill string, which cannot simulate the dynamic characteristics of the drill string under the actual interaction of air, water or cuttings, nor can it simulate the drill string in the air. The dynamic characteristics of the drill string in horizontal wells or highly deviated downholes, especially the erosion and corrosion of the drill string under the mixed fluid of gas, liquid and solid in the real annulus cannot be simulated

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