Mechanical Rotary Steering Drilling Tool

A mechanical rotary steering drilling tool comprising:

• a test section, a mandrel having a keyway, a clutch device, a guide body, a control mechanism, an execution part, a plane bearing, a TC bearing, and first and second ends, the first end being connectable with an upper drilling tool by a first detachable screw thread, and the second end being connectable with a bit by a second detachable screw thread;
• wherein:
• the test section is configured to test an azimuth angle, a tool face angle, and a well deviation angle, wherein the test section serves as an upper joint of the mechanical rotary steering drilling tool, and the inner part of the test section is connected with the mandrel;
• the clutch device includes a spring retainer axially positioned by a TC bearing static ring, a clutch key in the keyway of the mandrel, a clutch fixing screw that fixes the clutch key, a clutch control barrel connecting the mandrel and the guide body, and a clutch spring between the spring retainer and the clutch key;
• wherein the mandrel and the guide body rotate independently of each other when the clutch device is disengaged, but the mandrel and the guide body rotate together when the clutch device is engaged;
• the control mechanism includes a switch control cylinder that converts axial movement into rotational movement, a screw on the guide body configured to limit an axial displacement of the switch control cylinder, a control spring that drives the switch control cylinder, a thrust bearing that prevents the switch control cylinder from being driven by the control spring, and a switch driven by the switch control cylinder, the switch being configured to open or close a plurality of holes;
• the execution part includes a plurality of pushing blocks in first cavities on the guide body, a plurality of cover plates configured to limit a radial stroke of the pushing blocks, a plurality of cover plate screws configured to fix the cover plates, and a plurality of pushing block one-way nozzles configured to allow single direction communication;
• wherein the pushing blocks are configured to exert a pushing force on an external wall.