Driving retractable combination drill bit

Abstract

The invention relates to a driving retractable combination drill bit which mainly comprises a drill bit body, a well drilling liquid accommodating space, a well drilling liquid channel, a drill bit barrel, a compressive block, limiting stoppers, protruded rib plates in walls, a rotary retractable block, a retractable column, PDC (polycrystalline diamond compact) cutter wings and a cone. The PDC cutter wings are peripherally arranged along the outer wall of the drill bit body to form a central hollow groove; the retractable column which is positioned inside the drill bit barrel axially penetrates the central hollow groove, and the cone is fixedly arranged at the tail end of the retractable column; the retractable column can axially move up and down under the control of a retractable device; a hollow flow channel is axially fixedly connected onto the PDC cutter wings; the well drilling liquid accommodating space is jointly formed by the upper end surface of the compressive block and the side walls of the drill bit body; the protruded rib plates in the walls are peripherally arranged along the inner side of the drill bit barrel at intervals, and the limiting stoppers can axially move in slide grooves. The driving retractable combination drill bit has the advantages that merits of PDC drill bits and cone drill bits are sufficiently utilized, and accordingly the driving retractable combination drill bit is high in rock breaking speed and efficiency and long in service life under soft and hard staggered stratum conditions.

Description

technical field [0001] The invention relates to an active retractable composite drill bit, which is used for oil and gas exploitation and drilling development, and is especially suitable for breaking rocks in heterogeneous complex formations such as interlaced soft and hard layers. Background technique [0002] With the development of oil and gas drilling to deep wells and complex oil and gas reservoirs, the main battlefields for the exploration and development of oil and gas resources today are complex and difficult-to-drill formations such as deep hard formations and soft and hard formations. For sand-mud interlaced formations such as Shahe Street in Liaohe oil region, the existing problems of slow drilling speed, short bit life, frequent tripping, long drilling cycle, and high drilling cost have become restrictions on the exploration and development of oil and gas resources in soft-hard interlaced formations. And the important technical bottleneck of efficiency. Therefor...

AI Technical Summary

Problems solved by technology

However, in actual drilling, since each part of the composite drill bit is responsible for WOB during the drilling process, and the respective task assignment and work efficiency are not clear under the working conditions of mixed formations, they do not have the ability to actively adjust, so The improvement of drilling efficiency and the extension of bit life are only theoretical expected effects

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