Double-slip hydraulic anchoring sealing device for window sidetrack drilling

Abstract

The invention discloses a double-slip hydraulic anchoring sealing device for window sidetrack drilling. The double-slip hydraulic anchoring sealing device for window sidetrack drilling comprises a suspension unit (10). The suspension unit (10) is provided with a sealing unit (20), a locking and unsealing recovery unit (30), a slip anchoring unit (40) and a force transmission unit (60) in sequencefrom top to bottom. The suspension unit comprises an upper joint (11), an upper core tube (12), a lower core tube (13) and a lower joint (14) which are connected in sequence through threads from top to bottom. The external threads at the upper end of the lower joint is connected with a cylinder sleeve (15). A group of pressure transmission holes (17) which are evenly distributed in the circumferential direction are formed in the lower end of the lower core tube. An annular groove (16) is formed in the position, corresponding to the lower part of the slip anchoring unit, of the lower core tube.According to the double-slip hydraulic anchoring sealing device for window sidetrack drilling, a whipstock can be positioned axially or circumferentially in the window forming process by using hydraulic pressure, it is not necessary to arrange a positioning base beforehand, and the position for forming a window can be adjusted according technological requirements. The double-slip hydraulic anchoring sealing device for window sidetrack drilling is simple in structure, convenient to operate, and safe and reliable to use; and the production efficiency is improved because orientation, sealing, window formation and window repairing can be completed with one time of drilling.

Description

technical field [0001] The invention relates to a double-slip hydraulic anchoring and sealing device for window sidetracking and belongs to the technical field of drilling equipment. Background technique [0002] With the large-scale development of oil and gas fields, a large number of new or old wells need sidetracking through windows to increase production. The main purpose of sidetracking through windows is to achieve: "resurrection of dead wells", increase recovery, and reduce costs. [0003] Most of the existing window sidetracking anchoring tool structures use a single slip structure, which cannot plug old boreholes. When drilling, first use the running tool to lower the skewer together with the anchoring device into the predetermined position in the well, adjust the slope orientation of the skewer, and then fix the skewer in the well through hydraulic or mechanical setting; then rotate or Pull and press the drilling tool to separate the feeder from the skewer, then p...

AI Technical Summary

Problems solved by technology

The existing single-slip structure has low reliability in the above-mentioned operation process, and can only bear unidirectional force, and cannot bear circumferential rotation

Low adaptability to complex situations

In addition, after the sidetracking operation is completed, the anchor tool may be displaced, which makes it difficult to guarantee the safety of the operation and low efficiency

The anchoring device does not have a packing rubber tube. After running in, the old wellbore may collude with the formation, which may cause the danger of lost circulation, well kick or even blowout during sidetracking.

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