Dead point positioning indicator type shock absorber thruster

Abstract

The present invention provides a dead point location indicating type damping thruster which comprises an upper contact, shunt stoppers, upper cylinder bodies, pistons, a mandrel and a spline body; the upper cylinder bodies are disposed below the upper contact; the shunt stoppers are disposed at inner sides of the upper cylinder bodies; each shunt stopper is provided with a plurality of flow through holes; each shunt stopper is provided with a plurality of positioning clamping hoops; the spline body is disposed below the upper cylinder bodies; the spline body sleeves the mandrel; the pistons are disposed over the mandrel; and the pistons are positioned at the inner sides of the upper cylinder bodies. When the dead point location indicating type damping thruster is used in drilling a complex well, stroke positions of the pistons can be accurately determined by a driller, appropriate time to apply bit pressure is effectively indicated, automatic bit feeding is ensured during a stroke range, operation is simple, labor intensity is reduced, borehole quality is improved, the damping effect is achieved, and service lifetimes of a drill string and a drill bit are prolonged.

Description

technical field [0001] The invention belongs to the field of petroleum drilling, and in particular relates to a dead point positioning indicating type shock absorbing thruster. Background technique [0002] In horizontal wells, highly deviated wells, slim hole wells, deep wells, old wells, sidetracked wells, etc., many problems will arise in the conventional way of adding WOB to drill collars, such as low drilling speed, WOB distortion, and WOB fluctuations. , WOB not up to the designed WOB, drill sticking, high drilling cost and other problems, in this case it is difficult to achieve high-efficiency drilling. [0003] The use of the hydraulic pressurizer can change the way of adding pressure on bit. The pressurization of the hydraulic pressurizer does not rely on the gravity of the drill string itself, but the pressure difference formed by the high-pressure drilling fluid on the upper and lower end surfaces of the hydraulic pressurizer piston. The drill pressure is added t...

AI Technical Summary

Problems solved by technology

[0004] However, conventional hydraulic pressurizers are difficult to accurately judge the working status and the exact position of the drill bit in the formation.

When the hydraulic pressurizer is working, it is difficult for the ground staff to clearly understand the specific WOB situation at the bottom of the well, so they cannot reasonably guide the hydraulic pressurizer's WOB state

If the drilling tool is lowered too quickly, it may compress the hydraulic cylinder and reach the top dead center position of the pressurizer. If the pressure is too high, the drill bit will be damaged; if it is lowered too slowly and reaches the bottom dead center position, the drill bit may be separated from the bottom of the well, resulting in idling, which reduces the ROP and drilling efficiency

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