Shunt type automatic vertical well drilling tool suitable for gas drilling

Abstract

The invention relates to a split type automatic vertical drilling tool suitable for gas drilling, which is an anti-tilting drilling tool for oil-gas well drilling engineering, and comprises an upper joint, a shell, a lower joint, a core tube, an adjusting shim, a bearing, a baffle plate, a balancer, a deflector, a diverter and a valve. The drilling tool is characterized in that the upper joint, the shell and the lower joint are connected by screw threads; the adjusting shim, the bearing, the baffle plate, the balancer and the deflector are connected with the core tube in series; the diverter is fixed in the core tube by a bolt; and the valve is fixed on the shell. The split type automatic vertical drilling tool has wide application range, can adjust jet diameter by replacing the valve so as to adjust reacting force generated by jet airflow, has convenient operation, adopts the principle of gravity inductive inclination to carry out automatic induction and automatic inclination correction, does not need any extra operation, has the advantages of simple structure and good stability, adopts a mechanical structure, and has stable performance during use and long working life.

Description

technical field [0001] The invention relates to a split-type automatic vertical drilling tool suitable for gas drilling used in drilling engineering. Background technique [0002] Such vertical drilling tools in the prior art have been disclosed in the following patent documents. [0003] Chinese patent specification CN 2431393Y (published on May 23, 2001) describes an electromechanical-hydraulic integrated automatic vertical drilling tool. oblique force. The drilling device is equipped with a fixed guide sleeve, which is equipped with a drill string and a detection control device. The detection control device is connected to the electromagnetic reversing valve for control. The guide hydraulic cylinder is embedded in the fixed guide sleeve near the drill bit. The guide piston extends Fix the outer wall of the guide sleeve. [0004] Chinese patent specification CN 1519455A (disclosed on August 11, 2004) describes a vertical drilling anti-deviation device, which at least in...

AI Technical Summary

Problems solved by technology

[0007] The first reason is the underground reason: that is, geological factors. Due to the layered structure, stratum dip angle, fault, soft and hard interlacing, etc. in the sedimentary strata, and the physical properties and strengths in different directions are different, the drill bit is very different on the bottom of the well. Uniform cutting and unbalanced drilling, resulting in bending of the drilling tool near the drill bit, thus causing the pressure on bit to deviate from the original borehole axis

[0008] The second reason is the reason of the surface: that is, the lower drilling tool assembly equipped on the ground and the drilling parameters applied have an impact on the borehole deflection. For a given lower drilling tool assembly, the drilling pressure and rotational speed are the main drilling parameters Factors, in the drilling of the vertical section, the lower drill tool assembly will bend and deform under a certain WOB, and the bending of the drill string will make the WOB action direction deviate from the original wellbore axis at the drill bit, thus causing the wellbore to deviate

[0009] The third reason is the well deviation caused by the operation during the drilling construction process.

[0011] All kinds of vertical drilling tools or vertical drilling systems as mentioned in the above literature have their own advantages, but also have their own limitations. The above tools are only suitable for mud drilling. During the gas drilling process, gas column pressure, pump The internal and external pressure difference of drilling pressure and drilling pressure are low, so it is difficult to open the pushing mechanism of the vertical drilling tool with this pressure

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