Device for drilling miniature borehole on ultra-short radius of coiled tubing

A technology of ultra-short radius and tiny wellbore, which is applied to the driving device for drilling in the wellbore, drilling equipment, directional drilling, etc., and can solve the problems of downhole accidents and pin failure, so as to save drilling cost and increase the axial area , the effect of small footprint

Inactive Publication Date: 2008-10-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technology, the flexible shaft transmission joint is connected by pins. Since the axial force on the flexible bearing is completely transmitted to the pins connecting the transmission joints during the sidetracking process, the pins must bear both torque and axial force. Therefore, it is easy to cause pin failure and cause downhole accidents

Method used

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  • Device for drilling miniature borehole on ultra-short radius of coiled tubing
  • Device for drilling miniature borehole on ultra-short radius of coiled tubing
  • Device for drilling miniature borehole on ultra-short radius of coiled tubing

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Embodiment Construction

[0011] As shown in Figures 1 and 2, the present invention includes: a coiled tubing 1, a guide 4, a flexible transmission shaft 5, a drive motor 3 and a drill bit 6; the flexible transmission shaft 5 is installed in the guide 4, and the drill bit 6 is arranged on the flexible transmission shaft 5, the drive motor 3 is arranged at the input end of the flexible transmission shaft 5; the flexible transmission shaft 5 includes more than three transmission joints, the transmission joints are connected by ball joints 7, and the transmission joints and the ball joints 7 are surface touch. The oil flow in the coiled tubing 1 makes the driving motor 3 rotate, thereby driving the flexible transmission shaft 5 to rotate.

[0012] The specific arrangement of the flexible transmission shaft 5 is shown in Figures 2 and 3. The transmission section includes a top section 53 connected to the drive motor 3, a bottom section 51 connected to the drill bit 6, and at least More than one middle sec...

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PUM

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Abstract

The invention discloses a device for drilling minimal borehole on one coiled tubing side with ultra-short radius, which comprises a guider, a flexible transmission shaft, a driving motor and a bit. The flexible transmission shaft is arranged inside the guider, the bit is arranged at the output end of the flexible transmission shaft, and the driving motor is arranged at the input end of the flexible transmission shaft. The flexible transmission shaft includes more than three transmission sections which are connected with each other through ball heads, and the transmission sections are in surface contact with the ball heads. The invention increases the axial area of the flexible transmission shaft by using the ball heads to connect the transmission sections of the flexible transmission shaft and designing the surface contact between the transmission sections and the ball heads, thus prolonging the service time of the flexible transmission shaft and improving the device stability.

Description

technical field [0001] The invention relates to a device for sidetracking ultra-short-radius tiny boreholes for enhancing oil and gas recovery. Background technique [0002] An ultra-short radius horizontal well refers to a horizontal well with a shorter radius of curvature than a conventional short-radius horizontal well, and is also called an ultrashort radius radial well (Ultrashort Radius Radial Well). The drilling system for completing the horizontal well is called Radial Drilling Systems (RDS for short). [0003] At present, sidetracking in casing is generally adopted at home and abroad. In the old wellbore, the production string is first taken out, and then the power motor, flexible shaft and milling bit tool combination are lowered into the oil pipe, and a certain The pressure liquid drives the motor to rotate at high speed, the motor drives the drill to rotate at high speed, and the casing is milled to open the window. In this technology, the flexible shaft transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B4/02
Inventor 高卫宏谢从剑安百礼籍宁刘明娟
Owner CHINA NAT OFFSHORE OIL CORP
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