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Combined type diamond drill bit under complex and difficult drilling conditions

A diamond drill bit and composite technology, which is used in drill bits, drilling equipment, earth-moving drilling, etc., can solve problems such as low energy utilization rate, wear, and drill bit failure.

Pending Publication Date: 2018-11-23
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tri-cone bit breaks the rock in the way of impact crushing. Since the compressive strength of the rock is significantly higher than its shear strength and tensile strength, the energy utilization rate of this crushing method is not high, and the rock breaking efficiency is relatively low.
However, the cutting teeth on the PDC cutting structure still work in the continuous scraping mode. When the hardness and abrasiveness of the formation are high and the heterogeneity is strong, the PDC teeth will still wear quickly, which will cause the drill bit to fail.
This technical weakness hinders the further improvement of the drilling performance of composite drill bits in complex and difficult-drill formations

Method used

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  • Combined type diamond drill bit under complex and difficult drilling conditions
  • Combined type diamond drill bit under complex and difficult drilling conditions
  • Combined type diamond drill bit under complex and difficult drilling conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Such as figure 1 , 2 , 3, 4, and 5, a compound diamond drill bit for complex and difficult drilling conditions, including a drill body 1, a blade 3 extending from the drill body 1 or fixed on the drill body, water holes or nozzles 5, the The fixed blade 3 is provided with a fixed cutting element 31, and the drill bit is also provided with at least one cone body 8 and teeth 81, and at least one disk consisting of a disc cutter body 2 and a disc cutter cutting element 21. Knife, cone, disc cutter are formed to rotate and connect with bit body through cone support, disc cutter support respectively. Wherein, the cone support is the cone independent support 7, the disc cutter support is the disc cutter independent support 6, and the disc cutter cutting element 21 and the fixed cutting element 31 on the blade are circular PDC teeth.

[0104] The cutting teeth on the large deflection disc cutter form a long-distance spiral trajectory 210 at the bottom of the well, while the...

Embodiment 2

[0106] Such as Figure 6 , 7 , 14, 15, and 16, a compound diamond drill bit for complex and difficult drilling conditions, including a drill body 1, a blade 3 extending from the drill body 1 or fixed on the drill body, water holes or nozzles 5, the The fixed blade 3 is provided with a fixed cutting element 31, and the drill bit is also provided with at least one cone body 8 and teeth 81, and at least one disk consisting of a disc cutter body 2 and a disc cutter cutting element 21. Knife, toothed wheel, disc cutter form rotation connection with blade 3 respectively. In this example, both the disk cutter cutting element 21 and the fixed cutting element 31 on the blade 3 are circular PDC teeth.

[0107] The disc cutter teeth on the disc cutter and the cutting teeth on the fixed blade 3 are independent of each other, that is, the cutting teeth on the disc cutter do not replace the cutting teeth on the blade 3 in terms of structure, and will not directly affect the layout of the ...

Embodiment 3

[0111] Such as Figure 17 , 18 As shown, a composite diamond drill bit for complex and difficult drilling conditions includes a drill body 1, a blade 3 extending from the drill body 1 or fixed on the drill body, a water eye or a nozzle 5, and the fixed blade 3 is A fixed cutting element 31 is provided, and at least one cone body 8 and a tooth 81 are provided on the drill bit, and at least one disc cutter composed of a disc cutter body 2 and a disc cutter cutting element 21 is provided on the drill bit. The front side 33 is provided with a groove 20 that communicates with the cloth tooth surface 11, and the disc cutter is arranged in the groove 20. In this example, both the disk cutter cutting element 21 and the fixed cutting element 31 on the blade 3 are circular PDC teeth.

[0112] In the solution of the present invention, the cutting teeth on the disc cutter replace the fixed teeth on the blade 3 in structural form, and the alternate work of the cutting teeth in this area ...

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Abstract

The invention discloses a combined type diamond drill bit under complex and difficult drilling conditions. The drill bit comprises a drill bit body, a cutter wing, a nozzle or a jet nozzle, wherein the cutter wing extends from the drill bit body or is fixed to the drill bit body, a fixed cutting element is arranged on the fixed knife wing, meanwhile, one or more roller cones composed of roller cone bodies and teeth and one or more disc cutters composed of disc cutter bodies and disc cutter cutting elements are arranged on the drill bit, and the roller cones and the disc cutters are separatelyrotatably connected with the drill bit body through a roller cone support and a disc cutter support. The advantages of a roller cone-PDC combined drill bit and an intersecting cutter PDC drill bit arecombined, in this way, the working performance of the drill bit under the complex and difficult drilling conditions is improved, and the application range of the drill bit on the stratum is further enlarged.

Description

technical field [0001] The invention belongs to the field of technical equipment such as oil and gas drilling engineering, mining engineering, building foundation engineering drilling construction, geological drilling, geothermal drilling, hydrological drilling, tunnel engineering, shield tunneling and non-excavation, and in particular relates to a drilling bit. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. Drilling bits mainly include three-cone bits and diamond bits. Diamond drills can be divided into PDC (polycrystalline diamond compact) drills, TSP (thermally stable polycrystalline diamond) drills, natural diamond drills and impregnated diamond drills (referred to as impregnated drills) according to different cutting elements. Most of them are PDC drill bits and impregnated drill bits. [0003] Difficult-to-drill formations mainly refer to the poor drillability of the formation, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/50
CPCE21B10/43E21B10/50
Inventor 杨迎新张春亮黄奎林牛世伟王吉林敏
Owner SOUTHWEST PETROLEUM UNIV
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