SU762467A1 - Apparatus for drilling vertical wells - Google Patents

Description

The invention relates to the field of drilling equipment, namely, devices for drilling vertical wells.

A device for drilling vertical wells, containing a downhole motor with a stabilizer and an eccentric sub located above the bit, is known.

This device reduces the intensity of the curvature of the well due to centering and therefore has the disadvantage that with abrasive wear of the stabilizer, its efficiency decreases sharply.

The closest solution to the invention for a constructive implementation is a device for drilling vertical wells, containing located above the bit downhole motor having the shape of a pipe, and an eccentric sub with centralizer.

This device, in which the downhole motor located between the bit and the eccentric sub is mounted parallel to the other pipes, also reduces the intensity of the curvature of the well due to centering, and it has the same drawback as the above device.

The aim of the invention is to improve the intensity of the curvature of the well due to the constant change in the direction of the deflecting force acting on the bit.

The goal is achieved by what is in the mouth? ”A device for drilling vertical wells, containing drill pipes located above the bit and’. , a centric sub with a centralizer, a pipe located between the bit and an eccentric sub is fixed obliquely relative to the other pipes.

The drawing schematically shows the described device for drilling, vertical wells.

It consists of drill pipes 2 and 3 located above bit 1 and

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four

eccentric sub 4 with centralizer 5. Pipe 2, placed between bit 1 and eccentric sub 4, is fixed obliquely relative to other pipes 3, Pipe 2 length, its angle of inclination and Eccentricity value of sub 4 is determined by calculation for specific geological and technical drilling conditions. In this case, the upper part of the pipe 2 should not be in contact with the borehole wall.

In the process of drilling rotate the string of drill pipe 3 "as a result of which the upper part of the pipe 2 moves in a circle around the axis of the well. The deflecting force acting on the chisel in the plane of inclination of the pipe 2, while constantly changing nap. alignment Due to the short duration of 20

one

actions of deflecting force in each direction, the bit does not have time for rae-_ to tear down the borehole wall, and this provides a reduction in the intensity of the curvature of the well.

For turbine drilling, a downhole motor can be fixed instead of pipe 2 between dolo ~ <· volume 1 and eccentric sub 4. A calibrator can be installed to align the walls of the well above the bit. Drill pipes 3, located above the eccentric sub, can be centered with additional centralizers.

The use of the described device will reduce the intensity of the curvature of vertical wells, which will eliminate their over-drilling and reduce the cost of drilling by 5-10%.

Claims (1)

DEVICE FOR DRILLING VERTICAL WELLS, containing drill pipes located above the bit and eccentric sub from the center * * *! ·, With a torus, characterized in that, in order to reduce the intensity of the curvature of the well by constantly changing the direction of the deflecting force acting on the bit, the pipe, placed between the chisel and eccentric sub, fixed obliquely relative to the other pipes.