Downhole speed-increase and effect-increase tool under effect of dual pressure cavities and speed-increasing method

A dual-pressure, pressure chamber technology, applied in the field of hard formations with poor drillability and high abrasiveness, can solve the problems of reduced maximum depth capability, high friction, and affecting oil well production, so as to reduce friction and improve Drilling precision and small radial vibration effect

Inactive Publication Date: 2018-03-20
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the current directional drilling and horizontal drilling, the reason for the formation of the height of the curved wellbore is that the frictional resistance is too large, so the ability of the drilling rig to reach the maximum depth theoretically is significantly reduced, and it will even seriously affect the production of the oil well.

Method used

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  • Downhole speed-increase and effect-increase tool under effect of dual pressure cavities and speed-increasing method
  • Downhole speed-increase and effect-increase tool under effect of dual pressure cavities and speed-increasing method

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Embodiment Construction

[0011] Such as figure 1 , figure 2 As shown, the downhole speed-improving tool with dual pressure chambers mainly includes upper casing, inlet screw, lock nut, upper spring support, No. 1 spring, threaded shaft of valve assembly, No. 2 spring, lower spring support, and main gasket , middle shell, valve port, impact nut, piston, No. 3 spring upper support, No. 3 spring, No. 3 spring lower support, gasket, lower shell and impact assembly shaft, and its structural features are: the upper shell and the middle shell cooperate , the inlet screw is installed on the inner wall at the entrance of the upper casing, the upper spring support and the lower spring support are installed in the annular space between the upper casing and the threaded shaft of the valve assembly, and the No. 1 spring is installed between the upper spring support and the lower spring support, The No. 2 spring is installed on the lower support of the spring and is not in contact with the upper support of the sp...

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Abstract

The invention relates to a downhole speed-increase and effect-increase tool under the effect of dual pressure cavities and a method of the tool. Friction resistance is reduced in the drilling processof a deflecting section or horizontal section of a horizontal well, and the drilling speed is increased. According to the technical scheme, the downhole impact speed-increase tool mainly comprises anupper shell, a middle shell, a lower shell, an inlet screw, a piston, a valve assembly shaft and an impact assembly shaft. The speed-increasing method includes the steps that drilling liquid transmitspressure to compress an outer compression spring and pushes an impact nut at the right end to make contact with the piston, the piston drives the impact assembly shaft to move down, and a drill bit connected to the lower portion of the impact assembly shaft to hit rock; when the rock is hit, because the rigidity of an inner compression spring is larger than that of the outer compression spring, the nut and the piston are hit to be separated under the counter-acting force of the inner compression spring, all parts return to the initial positions, and one stroke length is completed. The tool issimple in structure, the friction resistance can be reduced and the drilling speed can be improved, the radial vibration is small, the trajectory is easy to control, the drilling precision is improved, and cost is saved.

Description

technical field [0001] The invention relates to a downhole speed-increasing and efficiency-improving tool and method thereof, which can reduce frictional resistance and increase drilling speed in the process of drilling a deflection section or a horizontal section of a horizontal well, and is especially suitable for lithology with poor drillability, Hard formation with high abrasiveness. Background technique [0002] During the drilling process, the friction between the drill string and the corresponding well wall is an important factor affecting the drilling speed. When the drilling assembly tool moves relative to the well wall, the additional torque and high friction caused by the friction will lead to a decrease in the drilling speed of the drilling rig, a small amount of drilling in a single trip, and severe abnormal wear of the drill string and drill bit and other adverse effects; when the overall combined friction force exceeds the applied drilling pressure (or the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/02
CPCE21B4/02
Inventor 石昌帅陈逸珂祝效华
Owner SOUTHWEST PETROLEUM UNIV
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