Mixed type downhole drilling bit

A kind of drilling bit, hybrid technology, applied in the direction of drill bit, drilling equipment, earthwork drilling, etc., can solve the problems of low cutting efficiency of roller cone bit cutting teeth, fixed cutting teeth are vulnerable to impact damage, PDC bit mechanical penetration rate is slow, etc. , to achieve the effect of improving the overall cutting efficiency and ROP, eliminating stick-slip phenomenon, and improving cutting efficiency and ROP

Inactive Publication Date: 2016-12-07
CHENGDU BEST DIAMOND BIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current oil drilling, when encountering hard formations or hard interlayers, the commonly used PDC drill bit mainly realizes drilling through the shearing motion of PDC teeth (polycrystalline diamond composite sheet), on the nose and shoulder of the drill bit Due to the load distribution characteristics of the PDC teeth on the contour of the drill bit, it is easy to be damaged prematurely, causing the ROP of the PDC bit to become very slow; while the roller cone bit breaks the rock by impact crushing, which is easy to produce deeper rocks. Broken tooth pits; but for drilling in formations with more soft and hard interlayers, the volume of the rock cannot be broken, so the cutting efficiency of the cutting teeth of the roller cone bit is also low
On the other hand, when the drill bit encounters some formations with more soft and hard interlayers, the fixed cutting teeth of the PDC diamond drill bit are extremely vulnerable to impact damage. A hybrid drill bit combined with a roller cone bit

Method used

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  • Mixed type downhole drilling bit
  • Mixed type downhole drilling bit
  • Mixed type downhole drilling bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as Image 6 with Figure 7 As shown, a hybrid downhole drilling bit is disclosed, comprising a drill body 5, the drill body 5 includes two blades 13 with only conical teeth 8 and two other blades 32 and two palms 10, the palms The lower end of 10 is welded together with the drill bit body 5, the upper end of the palm 10 is provided with a journal, and the cone 11 is set on the journal; The chisel-shaped teeth 3 and flat-head teeth 2 are located on the nose and shoulder of the blade profile. When drilling, they not only rotate around the axis of the cone 11, but also revolve around the central axis of the downhole drill bit, wherein the axis of the cone 11 is aligned with the center of the bit body 5 There is an angle between 35 degrees and 65 degrees between the lines, two blades 13 with only conical teeth 8 and two blades 32 with front row disc shear teeth 7, only The exposed height of the front row of tapered teeth 8 of the blade 13 of the tapered teeth 8 is gr...

Embodiment 2

[0049] Such as Figure 8 As shown, another hybrid downhole drilling bit is disclosed, including a drill bit body 5, and the drill bit body 5 includes two blades 60 provided with front row disc shearing teeth 77 and two blades with only conical teeth 88 Wing 83, two tooth palms and two cones 61; the cone chisel teeth 66 and flat teeth 63 distributed in rows on the cone 61, the chisel teeth 66 and flat teeth 63 on the cone are located at the blade 60 The nose and the shoulder of the profile, wherein the axis of the cone 61 and the centerline of the downhole drilling bit body 5 have an angle between 25 degrees and 68 degrees; the two front rows are arranged with disc shears The blade 60 of the tooth 77 has a rear row of teeth, and the rear row of teeth is a conical tooth 75, and the rear row of conical teeth 75 is distributed on the nose and the shoulder of the blade contour at the position of the blade contour. The exposure height of the upper and front disc shearing teeth 77 i...

Embodiment 3

[0051] Such as Figure 9 with Figure 10 As shown, another hybrid downhole drilling bit is disclosed, including a drill bit body 5, and the drill bit body 5 includes two blades 52 with disc shearing teeth 44 in the front row and a blade 53 with only conical teeth 45 , two tooth palms 33 and two cones 35, tooth palms 33 one ends are welded into one with the drill body 5, the other end of the tooth palms 33 is provided with a journal, and the cones 35 are sleeved on the journal (refer to Figure 4 ); chisel-shaped teeth 20 and flat-head teeth 22 are distributed in rows on the cone 35, and the chisel-shaped teeth 20 and flat-head teeth 22 on the cone 35 are located at the nose and shoulder of the blade profile. The 35 axis rotates on its own axis and revolves around the central axis of the downhole drill bit; there is an angle between the axis of the cone 35 and the center line of the downhole drilling bit body 5, which is between 35 degrees and 65 degrees; the bit body 5 includ...

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Abstract

The invention discloses a mixed type downhole drilling bit. The mixed type downhole drilling bit comprises a drilling bit body, blades, heads and cones, wherein the blades and the heads are fixedly connected with the upper end of the drilling bit body; the lower ends of the heads are fixedly connected with the side wall of the drilling bit body; the cones are rotationally connected with the upper ends of the heads through shaft journals; an included angle is formed between a central axis of each cone and a central axis of the drilling bit body; multiple conical teeth or/and wafer cutting teeth are arranged on the blades; multiple chisel-point teeth and flat teeth are arranged on the cones. By the combination of impact crushing of a cone drilling bit and ploughing motion and shearing motion of a blade structure drilling bit capable of realizing mixed tooth distribution, downhole primary crushing is realized, fixed cutting teeth are effectively drilled into rock, the stick-slip phenomenon of the drilling bit in some specific strata is eliminated, impact load of the fixed cutting teeth is reduced, the probability of impact damage of the fixed cutting teeth is reduced, and the cutting efficiency and the mechanical drilling rate are increased.

Description

technical field [0001] The invention relates to a hybrid drill bit for petroleum, natural gas and geological well drilling, in particular to a hybrid downhole drilling drill bit. technical background [0002] In the current oil drilling, when encountering hard formations or hard interlayers, the commonly used PDC drill bit mainly realizes drilling through the shearing motion of PDC teeth (polycrystalline diamond composite sheet), on the nose and shoulder of the drill bit Due to the load distribution characteristics of the PDC teeth on the contour of the drill bit, it is easy to be damaged prematurely, causing the ROP of the PDC bit to become very slow; while the roller cone bit breaks the rock by impact crushing, which is easy to produce deeper rocks. Broken tooth pits; however, for drilling in formations with more soft and hard interlayers, the volume of rock cannot be broken, so the cutting efficiency of the cutting teeth of the roller cone bit is also low. On the other h...

Claims

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Application Information

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IPC IPC(8): E21B10/14E21B10/12E21B10/16
Inventor 韩育民闭磊刘志鹏
Owner CHENGDU BEST DIAMOND BIT
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