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

An ultra-short-radius, tiny wellbore technology, which is applied to drilling drives, drilling equipment, and directional drilling in the wellbore. It can solve problems such as downhole accidents and pin failures, save drilling costs, and increase axial area. , Improve the effect of transmission while drilling
CN101294480BInactive Publication Date: 2012-08-15CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2012-08-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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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