Short-radius drilling tool

Abstract

The invention provides a short-radius drilling tool. The short-radius drilling tool comprises a guide drilling short section, a driving drill string and a driving control short section, the guide drilling short section comprises a guide short section and a drill bit, the guide short section comprises a bearing body, a deflection guide mechanism and an electric driving actuator are arranged on thebearing body, the drill bit is connected with the bearing body, the deflection guide mechanism can drive the drill bit to deflect in a preset direction, the driving drill string comprises a pluralityof bearing short sections which are sequentially connected from top to bottom, the bearing short section located at the lowest position is connected with the bearing body, every two adjacent bearing short sections are hinged through a bit pressure torque deflection transmission mechanism, the bearing short sections are hinged to the bearing body through the bit pressure torque deflection transmission mechanism, the driving control short section is provided with an electric driving actuator driving control circuit, and the electric driving actuator driving control circuit is electrically connected with the electric driving actuator through a jumper circuit. According to the short-radius drilling tool, the short build-up rate can be achieved, the length of the guide short section is effectively shortened, and then the directional drilling function can be achieved in a high-curvature borehole more easily.

Description

Technical field[0001]The invention relates to the field of drilling technology, in particular to a short radius drilling tool.Background technique[0002]The development of many oil and gas reservoirs or solid mineral deposits that require fluidized mining requires extensive use of drilling technology, even horizontal well drilling technology. Because the existing directional drilling technology cannot achieve short-radius steering, it is difficult to develop ultra-thin reservoirs; or directional wells that are difficult to deflect in the caprock but require large curvature steering after entering the reservoir; or achieve branching as much as possible Drilling; or to achieve large-angle turns in shallow formations, or to achieve the production of side-well reserves by sidetracking lateral wells in existing boreholes. In the prior art, screw drilling tools with bent joints are usually used to drill branch wells to realize the production of side-well reserves. Existing data indicate th...

Images