Whipstock

 

(57) Abstract:

The whipstock is designed to provide a deflection drill wells from a given direction. The whipstock includes a housing, a working surface which in cross section has the shape of a longitudinal trough, the threads in the rear part of the housing for connection with the shank, the axial longitudinal channel in the case with access to the working surface and the anchor. At a distance of not less than half the length of the whipstock from its tail, symmetrical to the longitudinal plane of the whipstock, on its surface below the longitudinal troughs made two longitudinal flats, which in cross section are two intersecting outside diameter of the whipstock chord, the angle between them is 60o. The axial channel in the housing connected with the said faces through radial holes, thread the tail portion of the body is at an angle to the longitudinal axis of the whipstock. The threads on the anchor shank, the lower part having an eccentric ring and thread to attach the anchor, which is made in the form of explosive packer. This embodiment of the whipstock can simplify its design and is rivani new trunk from the original well. 3 Il.

The invention relates to the field of mining, in particular for drilling directional wells, and relates to means such as a whipstock, to ensure that the deviation of the borehole from the original direction.

From the area known in the art whipstock comprising a housing, a working surface which in cross section has the shape of a longitudinal trough, while the whipstock has a body housing a conduit for supply of cement to the shank, and the specified channel is associated with a drilling tool, comprising lowered and tubing cutter on their end, through a flexible pipe (see U.S. patent 5894889, CL E 21 In 7/08, 99,).

The disadvantage of the whipstock is the difficulty of performing line for cement supply, and low reliability of the structure due to fracture or broken elastic pipeline during the descent of the projectile in the bore.

The closest, as to the problem at hand, and the total number of matching essential attributes is whipstock for U.S. patent 5427179, CL E 21 In 7/08, 1995, which includes a housing, a working surface which in cross section has the shape of a longitudinal trough, carried out is ARPUs for his connection with the shank, axial longitudinal channel in the case with access to the working surface and the anchor.

The disadvantage of the whipstock is the availability of special equipment for pressing against the wall of the bore opposite to the direction of the deviation, and the need to create a hydraulic connection to surface equipment anchor whipstock, which is made in the form of a hydraulic packer.

The objective of the invention is to simplify the design of the whipstock with increasing productivity through the use of logging cable for lowering and installation of the whipstock.

This object is achieved in that the wedge-diverter comprising a housing, a working surface which in cross section has the shape of a longitudinal trough, the threads in the rear part of the housing for connection with the shank, the axial longitudinal channel in the case with access to the working surface and the anchor at a distance of not less than half the length of the whipstock from its tail, symmetrical to the longitudinal plane of the whipstock, on its surface below the longitudinal troughs made two longitudinal flats, which in cross section are soboa axial channel in the housing connected with the said faces through radial holes, in this thread the tail portion of the body is at an angle to the longitudinal axis of the whipstock, the threads on the anchor shank, the lower part having an eccentric ring and thread to attach the anchor, which is made in the form of explosive packer.

Execution of longitudinal flats on the side surface of the whipstock and their relationship with the axial longitudinal channel will wash out of the gap between the body of the wedge and the wall of the borehole when the cutting window in the wall of the casing and provides unimpeded passage of the wireline channels whipstock during its descent and installation in the borehole. The execution thread the tail portion of the whipstock at an angle to its longitudinal axis will provide the deviation of the shank to the borehole wall, will increase the efficiency of its fixation.

The invention is illustrated by drawings, where Fig.1 shows a General view of the whipstock of Fig.2 is a cross section along a-a in Fig.1; Fig.3 shows a portion of the whipstock with the shank and the anchor is placed in the well.

The whipstock includes a housing 1, a working surface which in cross section has the shape of a longitudinal trough 2, the tail part 3 thread 4, which is made at an angle to propowerbot in the form of a chute 2. At a distance of not less than half the length of the whipstock from thread 4 his tail, symmetrically relative to the Central longitudinal plane, on the side surface of the whipstock below the longitudinal trough 2 is a longitudinal flats 6, which in cross section are two intersecting outside diameter of the housing 1 of the chord, the angle between them is 60o. Axial longitudinal channel 5 associated with 6 flats through radial holes 7. With the tail part of the body of the whipstock through the thread 4 is connected to the shank 8. The shank 8 is attached eccentric ring 9, which together with carved 4 provides axial displacement of the whipstock when it is installed in the well.

Pre-wedge collapses with the shank 8, the bottom of which is installed eccentric ring 9. After this wedge and the shank along their longitudinal channel 5 is skipped useplease device (not shown), which then connects to the cylinder of an explosive packer 10, and then head explosive packer. Geophysics seasoned explosive packer, through the adapter, connect it to the lift and make the descent of the wedge in the hole to your installation location..

Some disadvantages of this design whipstock should include the difficulty of carrying out the azimuthal orientation and the difficulty of extracting the set of the wedge after it is used.

Whipstock comprising a housing, a working surface which in cross section has the shape of a longitudinal trough, the threads in the rear part of the housing for connection with the shank, the axial longitudinal channel in the case with access to the working surface and the anchor, wherein at a distance of not less than half the length of the whipstock from its tail, symmetrical to the longitudinal plane of the whipstock, on its surface below protolog the outside diameter of the whipstock chord, the angle between them is 60oand the axial channel in the housing connected with the said faces through radial holes, thread the tail portion of the body is at an angle to the longitudinal axis of the whipstock, the threads on the anchor shank, the lower part having an eccentric ring and thread to attach the anchor, which is made in the form of explosive packer.

 

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