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Bit hydraulic structure capable of reducing pressure and accelerating speed and drilling bit

A technology of hydraulic structure and drill bit, which is applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of increasing the pressure holding force of the mud column on the bottom hole cuttings, so as to reduce repeated crushing, increase the drilling speed, reduce the The effect of drilling costs

Inactive Publication Date: 2011-01-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the holding force of the mud column on the cuttings at the bottom of the well, especially in deep and ultra-deep well drilling. not obvious

Method used

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  • Bit hydraulic structure capable of reducing pressure and accelerating speed and drilling bit
  • Bit hydraulic structure capable of reducing pressure and accelerating speed and drilling bit
  • Bit hydraulic structure capable of reducing pressure and accelerating speed and drilling bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the following combination figure 1 , figure 2 Be explained. The present invention includes a main flow channel 1, a drill bit body 2, a flow channel transition zone 3, a water hole 4, a ring groove 5, a sealing groove 6 and an erosion-resistant layer 7, the main flow channel 1, the flow channel transition zone 3 and the The water hole 4 is located in the drill bit body 2; the flow channel transition zone 3 communicates with the main channel 1 and the water hole 4; the axis of the flow channel transition zone 3 and the water hole 4 is perpendicular to The axis of the main flow channel 1 ; the snap ring groove 5 and the sealing groove 6 are located in the water hole 4 ; the erosion-resistant layer 7 is located on the surface of the flow channel transition zone 3 . The main flow channel 1 is cylindrical, connected with the drilling fluid channel in the drill string at the top, and connected with the transition zone 3 of the flow channel at the bottom. The...

Embodiment 2

[0022] Embodiment 2: below in conjunction with attached image 3 And attached Figure 4 Be explained. A three-cone bit for decompression and speed-up is composed of palm 11, cone 12, main flow channel 1, flow channel transition area 3, water hole 4, ring groove 5, sealing groove 6 and erosion-resistant layer 7. The channel transition zone 3 is composed of a tapered constriction section 8 , a turning bend section 9 and an upward diverging section 10 . Three identical flow channel transition areas 3 and water holes 4 are distributed symmetrically at 120° in the same plane inside the drill body 2 , and this plane is perpendicular to the axis of the main flow channel 1 . When they are not in the same plane, the distances between the flow channel transition zones 3 and the water holes 4 of each group are the same from the horizontal plane of the well bottom. In the drawings, the direction indicated by the solid arrow is the flow direction of the mud in the drill bit.

[0023] I...

Embodiment 3

[0024] Embodiment 3: below in conjunction with attached Figure 5 And attached Figure 6 Be explained. A pressure-reducing and speed-increasing PDC drill bit consists of a drill body 2, a flow channel 1, a flow channel transition zone 3, a water hole 4, a ring groove 5, a sealing groove 6, an erosion-resistant layer 7, a blade 13 and a synthetic diamond composite sheet- Composition of PDC14. The channel transition zone 3 is composed of a tapered constriction section 8 , a turning bend section 9 and an upward diverging section 10 . According to needs, 1-10 groups of the same flow channel transition zone 3 and water hole 4 can be set in the drill body 2. In this embodiment, 4 groups of the same flow channel transition zone 3 and water hole 4 are used, which are symmetrically distributed at 90°. In the same plane inside the drill body 2, and this plane is perpendicular to the axis of the main flow channel 1. The distances of each group of the flow channel transition zone 3 an...

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Abstract

The invention relates to a bit hydraulic structure capable of reducing the pressure and accelerating the speed and a corresponding drilling bit and belongs to the petroleum and geology drilling engineering field. The bit hydraulic structure comprises a drilling bit body, a main runner, a runner transition region, a water hole, a clamp spring groove, a sealing groove and a erosion-resisting layer. The bit hydraulic structure is characterized in that the main runner, the runner transition region and the water hole are arranged in the drilling bit body; the runner transition region is communicated with the main runner and the water hole; the axes of the runner transition region and the water hole are perpendicular to the axis of the main runner; the clamp spring groove and the sealing groove are arranged in the water hole, and the erosion-resisting layer is arranged on the surface of the runner transition region. The angle between the water hole outlet direction of the drilling bit and the axis of the drilling bit is 90 degrees, the angle between the water hole outlet and the radial direction is 0-90 degrees; the mud is injected to the wall of the well slantwise to form a low-pressure swirl region under the rotary speed of the drilling bit and the tangential velocity of the mud, thus reducing the local pressure of the drilling bit acting surface and the hold down effect of the mud column to the debris; and the drilling fluid cleans out the bottom-hole debris, thus accelerating the cleaning of the debris, improving the drilling rate and reducing the drilling cost.

Description

Technical field [0001] The invention relates to the fields of petroleum and geological drilling engineering, in particular to a drill bit hydraulic structure and a drill bit for reducing pressure and increasing speed. Background technique [0002] In order to exploit underground oil and gas resources, it is necessary to use drilling tools to drill through underground formations. These drilling tools generally include a derrick, a rotary table, a kelly, a drill pipe, a drill collar and a drill bit from the surface to the ground. The drill bit cuts through the formation to drill the wellbore. When the drill bit cuts the formation, a large amount of cuttings are produced at the bottom of the well. In order to remove these cuttings to the surface, drilling fluid must be injected through the inside of the drill string while drilling. The drilling fluid is ejected from the drill bit and passes through the drill string and the formation. The annular space between returns to the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/60E21B10/61E21B10/18
Inventor 朱海燕邓金根谭强王利华黄凯文
Owner CHINA UNIV OF PETROLEUM (BEIJING)