Drilling speed increasing device with composite drill bit

A composite drill bit and drilling technology, which is applied to the driving device, drill bit, drilling equipment, etc. for drilling in the wellbore, can solve the problems of low rotation speed of the pilot bit and insignificant drilling speed increase, and achieves the advantages of fast drilling, convenient and accurate drilling. The effect of directional drilling and reducing the difficulty of rock breaking

Active Publication Date: 2017-11-24
SICHUAN DEEP & FAST OIL DRILLING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention overcomes the deficiencies of the prior art and provides a drilling speed-increasing device that can obtain a two-stage speed-up for the pilot bit so as to increase the drilling speed as a whole, and solves the problem of the low speed of the pilot bit and the low drilling speed of the existing two-stage drilling device. The problem of not obvious speed increase

Method used

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  • Drilling speed increasing device with composite drill bit
  • Drilling speed increasing device with composite drill bit
  • Drilling speed increasing device with composite drill bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 and figure 2 As shown, the present invention includes a multi-kinetic joint 1. The multi-functional joint 1 is respectively connected with an outer shell 2 and a screw drive assembly 3. The screw drive assembly 3 is sleeved in the outer shell 2, and the outer shell 2 is far away from the multi-functional joint 1. One end of the screw drive assembly 3 is connected with a reaming drill bit 4, and the end of the screw drive assembly 3 away from the multifunctional joint 1 is connected with a pilot drill bit 5, and both the reaming drill bit 4 and the pilot drill bit 5 are provided with water holes; the reaming drill bit 4 is a diamond It is a kind of drill bit and roller cone bit, and the pilot bit 5 is a kind of diamond drill bit and roller cone bit.

[0044] Driven by the external driving device, the present invention has a certain rotational speed, so that the multifunctional joint 1 drives the outer casing 2 and the screw drive assembly 3 to rotate t...

Embodiment 2

[0049] On the basis of the first embodiment, the multifunctional joint 1 is provided with several oblique holes 11 , and the cavity between the outer casing 2 and the screw drive assembly 3 communicates with the oblique holes 11 . The cavity between the outer shell 2 and the screw drive assembly 3 communicates with the inclined hole 11, so the drilling fluid flowing through the multifunctional joint 1 can enter the space between the outer shell 2 and the screw drive assembly 3 through the inclined hole 11 cavity. Drilling fluid will not directly wash the bearing between the outer casing 2 and the screw drive assembly 3, which avoids the leakage of drilling fluid from the bearing or the failure of the bearing.

Embodiment 3

[0051] Such as Figure 4 As shown, on the basis of Embodiment 1 or Embodiment 2, the screw drive assembly 3 includes a screw housing assembly and a drive assembly, and the drive assembly is sleeved in the screw housing assembly; the screw housing assembly includes a stator housing 31. One end of the stator housing 31 is connected to the multifunctional joint 1, and the other end of the stator housing 31 is sequentially connected to a cardan shaft housing 32 and a bearing housing 33, and the bearing housing 33 is sleeved in the reaming drill bit 4.

[0052] The drilling fluid passing through the pilot bit 5 and the reaming bit 4 is isolated by the screw housing assembly to ensure that the drilling fluid without pressure drop directly enters the screw drive assembly 3 to drive the pilot bit 5 to rotate, improving the drilling fluid driving screw drive assembly 3 stability.

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Abstract

The invention relates to the field of petroleum and natural gas drilling equipment, in particular to a drilling speed increasing device with a composite drill bit. According to the technical scheme, the drilling speed increasing device with the composite drill bit comprises a multifunctional connector, the multifunctional connector is connected with a shell and a screw driving assembly, and the screw driving assembly is sleeved with the shell; the end, away from the multifunctional connector, of the shell is connected with a reaming drill bit body, and the end, away from the multifunctional connector, of the screw driving assembly is connected with a pilot drill bit body; water holes are formed in the reaming drill bit body and the pilot bit body; and the reaming drill bit body is a diamond drill bit or a roller bit, and the pilot bit body is a diamond drill bit or a roller bit. According to the drilling speed increasing device, the pilot bit body can achieve two-stage speed increasing, accordingly the overall drilling speed is increased, and the problems that a pilot bit of an existing two-stage drilling device is low in rotation speed and not obvious in drilling speed increasing are solved.

Description

technical field [0001] The invention relates to the field of oil and gas drilling equipment, in particular to a drilling speed increasing device with a composite drill bit. Background technique [0002] With the increasing difficulty of oil and gas field development and the rapid development of drilling technology, oil and gas fields have increasing requirements for drilling speed, especially the number of deep wells, ultra-deep wells, wells with complex well structures (extended reach wells, horizontal wells, multi-branch wells, etc.) During the drilling process, with the increase of the drilling depth, not only the drilling pressure will intensify the holding effect on the bottom of the well, but also the strength, vertical stress, and horizontal stress of the underlying rock will increase accordingly, and the drillability of the underlying rock will become poor. , leading to a decrease in the mechanical speed, which not only affects the control of the wellbore quality, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/16E21B10/26E21B17/04E21B21/00E21B17/10
CPCE21B4/16E21B10/26E21B17/04E21B17/1078E21B21/00Y02P70/10
Inventor 曾德发张苡源李恒朱志张堂佳郑耀东邓阳军李勇刚
Owner SICHUAN DEEP & FAST OIL DRILLING TOOLS CO LTD
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