Multifunctional pdc drill with mechanical control
A multi-functional and mechanical technology, applied in drill bits, earth-moving drilling, drilling equipment, etc., it can solve the problems of low drill bit life and slow drilling speed, and achieve the effect of efficient and reliable diameter maintenance and reaming.
Active Publication Date: 2020-09-29
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
While creating good economic benefits, the PDC drill bit has also exposed many problems, mainly manifested in the low life of the drill bit and slow drilling speed in complex formations and above-medium hard formations
Method used
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Embodiment Construction
[0013] The present invention will be further described below in conjunction with accompanying drawing:
[0014] See attached figure 1 The multifunctional PDC drill bit with mechanical control includes an upper joint 1, a body, and a drill body 10. The upper joint 1 is connected to the upper end of the body by threads, and the drill body 10 is connected to the lower end of the body by threads; Ring 3, inner cylinder 4, sealing ring a5, pin a6, indexing mechanism 7, spring a8 and sealing ring b9, the anti-drop ring 3 is installed between the lower end surface of the upper joint 1 and the upper end surface of the inner cylinder 4, and the inner cylinder 4 Connect with the outer cylinder 2 through the pin a6, the end of the pin a6 extends into the outer wall groove of the indexing mechanism 7 to control the limit displacement of the indexing mechanism 7, between the lower part of the indexing mechanism 7 and the lower step surface of the outer cylinder 2 A spring a8 is installed ...
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The invention relates to a multifunctional PDC drill bit regulated and controlled mechanically. The multifunctional PDC drill bit comprises an upper joint, a body and a drill bit body. The upper jointis connected to the upper end of the body through a thread, the drill bit body is connected to the lower end of the body through a thread, when high-pressure well drilling fluid enters a cavity between the upper end of a transposition mechanism and an inner cylinder from a circumferential hole in the middle of a fall-prevention ring, the transposition mechanism moves downwards under the effect ofthe well drilling fluid pressure, when a circumferential hole in the lower part of the transposition mechanism is connected with a radial channel hole in the drill bit body, the high-pressure well drilling fluid enters a cavity between the drill bit body and a lower piston, the lower piston moves downwards under the effect of the well drilling fluid pressure, then a rotating cutter ring is pushedto rotate outwards around a pin, when the rotating cutter ring is closed, the drill bit can achieve the gauge protection function, and when the rotating cutter ring is opened, the drill bit achievesthe reaming function. According to the multifunctional PDC drill bit regulated and controlled mechanically, the well drilling efficiency can be improved, and the multifunctional PDC drill bit is suitable for ensuring normal well drilling operation under the situation that a borehole is irregular or the diameter of the borehole is decreased.
Description
technical field [0001] The invention relates to a mechanically regulated multifunctional PDC drill bit used for oil and natural gas exploitation operations, and is especially suitable for the situation of irregular boreholes, diameter shrinkage of boreholes or severe wear of the PDC drill bit. Background technique [0002] At present, the PDC bit has become a general product for drilling engineering in the world, while the roller cone bit has become a special bit. The U.S. Department of Energy has identified the PDC bit as the main means of increasing the ROP. All oilfields attach great importance to the use of PDC bits, and PDC bits for deep wells and ultra-deep wells are the main way to increase drilling speed. When drilling in soft-medium hard rock formations, the drilling efficiency of PDC bit is much higher than that of impregnated bit and roller cone bit. While creating good economic benefits, the PDC drill bit has also exposed many problems, mainly manifested in the...
Claims
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IPC IPC(8): E21B10/32E21B10/60E21B10/46
Inventor 田家林胡学华杨敏敏高宏博何虹志杨应林杨毅
Owner SOUTHWEST PETROLEUM UNIV