Coiled tubing casing window-milling tool and window-milling method

Abstract

The invention provides a coiled tubing casing window-milling tool and a window-milling method. The coiled tubing casing window-milling tool comprises a coiled tubing, a screw motor, a window-milling and repairing milling cone, a whipstock and an anchor which are sequentially connected from top to bottom, wherein the screw motor is provided with a working flow channel and a bypass flow channel, an electric control switch valve used for controlling opening and closing of the working flow channel and the bypass flow channel is mounted on the screw motor, the window-milling and repairing milling cone is provided with an inner flow channel communicating with the working flow channel and the bypass flow channel, the whipstock is provided with a window-milling slope used for guiding the window-milling and repairing milling cone, the anchor comprises an expansion pipe, and a diameter expanding body and a pressure cavity located above the diameter expanding body are arranged in the expansion pipe. The hydraulic expansion type anchor is adopted, compared with an existing slip type anchoring mechanism, anchoring is more reliable, the reliability of the whole window sidetrack drilling operation is improved, anchoring of the anchor, positioning of the whipstock and mill window milling can be completed through a window-milling tool in one-time drilling, the number of times of tripping can be reduced, the construction period can be shortened, and the drilling cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of casing window opening, in particular to a coiled tubing casing window opening tool and a window opening method. Background technique [0002] Compared with conventional drilling rig drilling, coiled tubing drilling has the advantages of fewer construction personnel, less workload, continuous circulation when tripping and tripping, small footprint, safety and efficiency, and cost savings. Applying coiled tubing to implement sidetracking of old wells is an important means to restore the productivity of old wells and increase reserves and production. Deepening old wells or sidetracking through windows in old oil and gas fields can not only greatly save drilling costs, but also The discovery of new reserves will help old oil and gas fields to stabilize and increase production, improve ultimate recovery, and increase the investment benefits of oil and gas fields. [0003] Traditional casing window sidetrackin...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a coiled tubing casing window opening tool and a window opening method, which can solve the problem of unreliable anchoring existing in the existing integral skewer

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