Rotary steering well drilling device

Abstract

The invention relates to a rotary steering well drilling device in the field of well drilling tools. The rotary steering well drilling device is mainly composed of a central spindle, a positioning cylinder, a positioner, a positioning key, a tension spring, a control valve, a control pin, a compression spring, an offset block, a bearing and a sealing device. The central spindle is connected with a drill column and a drill bit. During deflecting, an offset mechanism stretches out, the drill column and a well hole are eccentric, the positioning cylinder and the offset mechanism do not rotate, the drilling pressure and the torque are transmitted to the drill bit through the central spindle, and therefore a deflecting section can conduct rotary and directional drilling. During angle holding, the offset mechanism retracts back, the drill column and the well hole are concentric, the drilling pressure and the torque are transmitted to the drill bit through the central spindle, and therefore an angle holding section conducts rotary drilling. The rotary steering well drilling device is high in deflecting capability, wide in application range and capable of greatly reducing the well drilling cost of a well of a complex structure, and meanwhile the rotary steering well drilling device has the beneficial effects of being simple and reliable in structural design, convenient to machine, large in transmission torque, stable in operation and the like.

Description

technical field [0001] The invention mainly relates to a rotary steerable drilling device in the fields of petroleum and natural gas drilling, coal bed gas drilling, geological exploration and mine drilling. Background technique [0002] In order to meet the requirements of exploration and development of oil and gas resources, there are more and more wells with complex structures such as extended-reach wells, three-dimensional multi-target wells, horizontal wells with long horizontal sections, and lateral wells. The efficiency is much lower than that of rotary drilling, and there are many problems such as poor borehole purification, poor wellbore quality, and frequent downhole complex situations, which directly affect the efficient development of oil and gas reservoirs. Therefore, the rotary steerable drilling technology has been developed, that is, the rotary steerable drilling system is used to adjust the well deviation and azimuth in the rotary drilling mode, and with the...

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Problems solved by technology

Domestic research institutions have also carried out research on rotary steerable drilling devices based on foreign technical data, such as rudder plate type drill guide (patent No. 96211800.1), eccentric stabilizer drilling guide tool (patent No. Patent No. 96226289.6), etc., although they can perform directional drilling and azimuth adjustment, they cannot continuously control the wellbore trajectory in real time, and due to the monopoly of key technologies and the limitation of components, domestic research on rotary steerable drilling technology is still in the indoor research stage, and it is difficult to Meet the urgent needs of efficient development of domestic oil and gas fields

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