A Push-to-Back Rotary Steering Drilling Tool

Abstract

The invention discloses a push-the-bit rotary steering drilling tool. The push-the-bit rotary steering drilling tool comprises a core shaft, an outer barrel, a tandem bearing, a bearing locating sleeve, a starting part, a wedge-shaped barrel, a control barrel, a spring, an upper moushroom valve, a lower moushroom valve, a sliding block, a sliding limiting barrel, an extensible block, a moving part, a stop block, a bypass-valve, a sealing sleeve, a locating sleeve and a sealing element, wherein the starting part is in wedge surface fit with the control barrel, the wedge-shaped barrel is in wedge surface fit with the control barrel, the upper moushroom valve is connected to the lower end of the control barrel through splines, when pump pressure is increased, the starting part moves down, thecontrol barrel drives the upper moushroom valve to rotate, thus radial channel holes of the upper moushroom valve communicate with radial channel holes of the lower moushroom valve, drilling fluid enters and pushes the sliding block down, thus the core shaft communicates with a radial channel hole of the outer barrel d, and the extensible block moves outward under the effect of drilling fluid pressure to achieve the guiding function. According to the push-the-bit rotary steering drilling tool, the structure is simple and reliable, control over well tracks can be realized, and the push-the-bitrotary steering drilling tool is suitable for using in structural wells such as horizontal wells and highly-deviated wells.

Description

technical field [0001] The invention relates to a new drilling tool used in the field of oil and natural gas exploration and development, especially a rotary steerable drilling tool that can realize deflection control by adjusting drilling fluid pressure. Background technique [0002] With the development of the petroleum industry, in order to obtain better economic benefits, it is necessary to drill deep wells, ultra-deep wells, extended-reach wells and long-distance horizontal wells, and it is often necessary to drill wells in more complex formations such as high-steep structural belts. With the new requirements for drilling wellbore trajectory in the process of oil and gas field development, rotary steerable drilling technology emerged as the times require. The rotary steerable drilling system is essentially a tool system composed of a downhole closed-loop variable-diameter stabilizer and a measurement transmission instrument (MWD / LWD). Increasing the drilling speed can ...

AI Technical Summary

Problems solved by technology

Moreover, due to high research and development costs, difficult processing, and short service life, there are currently no mature products independently developed in China. The lack of this technology is also one of the characteristics that the development of my country's oil industry lags behind that of the United States and other oil powers.

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