Device used for weakening stick-slip vibration of downhole drilling tool and control method of device

A stick-slip vibration, bottom hole drilling tool technology, applied in drilling tools, drill bits, drilling equipment, etc., can solve the problems of increasing drilling construction cost, affecting the ROP, affecting the life of the drill bit, etc., and shortening the time required for construction. The effect of reducing security risks and facilitating implementation

Active Publication Date: 2014-01-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the frequency of stick-slip vibration, the greater the impact damage to the PDC drill bit, which not only seriously affects the life of the drill bit and the improvement of the ROP, but also increases the cost of drilling construction and causes safety hazards

Method used

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  • Device used for weakening stick-slip vibration of downhole drilling tool and control method of device
  • Device used for weakening stick-slip vibration of downhole drilling tool and control method of device
  • Device used for weakening stick-slip vibration of downhole drilling tool and control method of device

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Embodiment Construction

[0010] The present invention is a device for weakening the stick-slip vibration of the bottom hole drilling tool and its control method. There are two specific ways of implementation. figure 1 And attached figure 2 For the first specific implementation mode, image 3 It is the second specific implementation manner.

[0011] For the first specific implementation mode, refer to the attached figure 1 , 2 As shown, the present invention is a device for weakening the stick-slip vibration of the bottom hole drilling tool and its control method. The feature is: the present invention has an outer sleeve 1, and the outer sleeve 1 is equipped with a piston 3 and an automatic valve switch 11 to control the volume of the sleeve cylinder 5 so as to drive the outer sleeve 1 to move axially relative to the hollow shaft 6. The outer sleeve 1 and the hollow shaft 6 are connected by a spline 15, the upper end of the hollow shaft 6 is equipped with a strain sensor 8, the sleeve cylind...

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Abstract

The invention relates to a device used for weakening the stick-slip vibration of a downhole drilling tool and a control method of the device in petroleum and gas drilling operation. According to the technical scheme, the device is installed between a drill bit and the downhole drilling tool; the device is provided with an outer sleeve, wherein a piston, a spring and a spline are installed in the sleeve; the size of a sleeve cylinder is controlled to drive the outer sleeve to move axially relative to a hollow shaft so that the drill bit can be separated from a downhole. According to the device used for weakening the stick-slip vibration of the downhole drilling tool and the control method of the device, when the torque at the drill bit can not reach a value required by rock breaking, the drill bit is lifted by a certain distance so as to reduce the torque required by rock breaking, the situation that the drill bit stops rotating temporarily and releases energy instantaneously, namely the stick-slip vibration is prevented from happening, the drill bit can keep drilling under a normal operating condition so as to reduce damage of the stick-slip vibration to drill bit teeth, and the service life of the drill bit is prolonged; the damage of the stick-slip vibration to the drill bit can be mitigated, the penetration rate can be increased, energy loss can be reduced, the rock breaking efficiency is improved, no extra process is added, and the device and the control method of the device are convenient to implement, safe and reliable.

Description

technical field [0001] The invention relates to a device and a control method for weakening the stick-slip vibration of bottom drilling tools in oil and gas drilling operations. Background technique [0002] In oil and gas drilling operations, due to the characteristics of fast drilling speed and high rock breaking efficiency of PDC (polycrystalline diamond compact) drill bit, it has been widely used. However, there are also shortcomings in the use of PDC drill bits, that is, the impact damage of the stick-slip vibration to the drill bit teeth is very serious. When using a PDC bit to drill some difficult-to-drill bottom layers, it is often because the drill bit cannot get enough torque to break the rock and the torque required to break the rock will cause the bit to slow down or even stop rotating. But at the same time, the drill string still continues to rotate and coil with the drive unit, storing torque energy along the length of the drill string. Once the torque requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B12/04E21B10/46
Inventor 祝效华向国春
Owner SOUTHWEST PETROLEUM UNIV
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