Turbine type hydroscillator for well drilling

Abstract

The invention discloses a turbine type hydroscillator for well drilling. The turbine type hydroscillator for well drilling comprises a vibration short section assembly and a power short section assembly, a static valve and a movable valve are mounted in the power short section assembly, a movable valve runner is mounted on the movable valve, a static valve runner is mounted on the static valve, the overflow area of communication of the movable valve runner and the static valve runner is periodically changed, flowing-in well drilling liquid generates axial simple harmonic quantity pressure waves, a turbine shaft and a turbine rotating drive structure are arranged in the power short section assembly, the top of the turbine shaft is connected with an adjusting nozzle, the adjusting nozzle isused for adjusting the well drilling liquid flow flowing through the turbine rotating drive structure to adjust the frequency of the simple harmonic quantity pressure waves, the simple harmonic quantity pressure wave can be transmitted to the vibration short section assembly, under the effect of the pressure waves, the vibration short section assembly can achieve continuous axial simple harmonic quantity vibration, back-pressure sticking in the deep well oil base slurry drilling process can be solved, shortcomings of an existing hydroscillator can be overcome, static friction force can be converted into movable friction force, friction resistance can be reduced, the effective drill pressure can be increased, and mechanical drill speed can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a turbine hydraulic oscillator for drilling. Background technique [0002] With the development of oil exploration and development technology, in order to improve the recovery rate and increase the output of oil and gas fields, the proportion of horizontal wells, lateral wells, and extended-reach wells is increasing. The friction between the rocks is relatively large, which causes the drill string to under pressure and stick during the drilling process. Especially in the sliding drilling process, the drill string and the rock on the well wall are in a relatively static state within a certain period of time. Since the static friction is much greater than the friction This increases the lowering resistance of the drill string, reducing the WOB applied to the drill bit through the drill string, resulting in lower ROP, longer drilling cycle, and increased drillin...

AI Technical Summary

Problems solved by technology

However, the screw-driven hydraulic oscillator has a large pressure drop, and because it contains a stator of rubber material inside, it cannot be used in oil-based mud and cannot withstand high temperatures. These shortcomings limit this type of hydraulic oscillator. scope of application

Another type of hydraulic oscillator is the turbine-driven hydraulic oscillator. This type of tool can make up for the deficiency of the screw-driven hydraulic oscillator, but there are also certain problems in this type of tool, such as the high speed of the turbine. , so that the frequency is too high and the amplitude is low, that is, the oscillation force is relatively small, and the field application effect is poor

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