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Double-speed PDC drill bit based on screw drive

A technology of screw drive and drill bit, which is applied in the direction of drill bit, driving device for drilling in the wellbore, drilling equipment, etc. It can solve the problems of low mechanical penetration rate and low rock breaking efficiency in the core, and improve the drilling operation efficiency and structure. The design is compact and reasonable, and the effect of increasing the ROP

Inactive Publication Date: 2019-07-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low rock-breaking efficiency in the core when drilling in the "three-high strata" in the background technology, which leads to low ROP, and proposes a two-speed PDC drill bit based on screw drive

Method used

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  • Double-speed PDC drill bit based on screw drive
  • Double-speed PDC drill bit based on screw drive
  • Double-speed PDC drill bit based on screw drive

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing:

[0017] According to the drawings, the two-speed PDC drill bit driven by the screw consists of an anti-drop joint (1), an anti-drop nut (2), a screw motor stator (3), a screw motor rotor (4), and a screw motor housing ( 5), living hinge a (6), cardan shaft (7), extended large drill bit (8), living hinge b (9), Y-shaped sealing ring (10), diversion joint (11), central small drill bit ( 12), consisting of a small drill nozzle (13) and a large epitaxial drill nozzle (14); it is characterized in that: the assembly sequence is to first put the screw motor stator (3) into the screw motor casing (5), and then install it on the lower end of the screw motor rotor. Living hinge a (6), install the screw motor rotor (4) into the screw motor stator (3), install the cardan shaft (7) at the lower end of the living hinge a (6), assemble the living hinge b (9), assemble the guide The flow j...

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Abstract

The invention discloses a double-speed PDC drill bit based on screw drive. The double-speed PDC drill bit mainly comprises an anti-drop upper joint, an anti-drop nut, a screw motor stator, a screw motor rotor, a screw motor shell, a cardan shaft, an extended large drill bit, Y-shaped seal rings, a flow guide joint, a center small drill bit, a small drill nozzle and the like. The assembly sequenceis that first a screw motor assembly part and a cardan shaft assembly part are assembled together, the flow guide joint is assembled, and an integral part is assembled; the Y-shaped seal rings and anextended large drill bit nozzle are installed on the extended large drill bit, and the extended large drill bit is assembled; and the center small drill bit is assembled on the flow guide joint afterthe small drill bit nozzle is installed on the center small drill bit, the anti-drop upper joint and the anti-drop nut are assembled, and the assembly is completed. The double-speed PDC drill bit drives a screw motor through high-pressure drilling fluid, the center small drill bit is driven, the double-speed PDC drill bit has the characteristics that the center small drill bit and the extended large drill bit drill at different speeds, and the mechanical drilling speed can be effectively increased.

Description

technical field [0001] The invention belongs to the field of oil and natural gas exploitation, and in particular relates to the design of a two-speed PDC drill bit driven by a screw rod. Background technique [0002] With the deepening of exploration and development of oil and gas resources, there are more and more deep wells, ultra-deep wells and new oil and gas resource wells, and it is possible to encounter "three high formations" (high rock hardness, high rock drillability value, and high abrasiveness) In the process of drilling and breaking rocks with traditional PDC bits, the low rock breaking efficiency at the core is an important factor restricting the ROP. The main reason for the low rock breaking efficiency of the core is the low movement speed of the cutting teeth in the core of the wellbore during the rock breaking process, which causes the core of the drill bit to be "topped" by the rock during the drilling process, and the rock in the center of the borehole is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/02E21B10/567E21B10/573E21B10/62
CPCE21B4/02E21B10/5676E21B10/573E21B10/62
Inventor 田家林胡志超葛桐旭宋豪林文峰邓喆
Owner SOUTHWEST PETROLEUM UNIV