Device for stabilizing diverter

 

(57) Abstract:

The invention relates to the drilling of deep oil and gas wells, and in particular to a device for guiding and stabilizing the engine of the whipstock. The invention consists in that the device includes a chisel, the engine of the whipstock with the fixing unit, and the fixing unit is made in the form of a support tube with a hinge spatial type, the latter is located between the engine-the whipstock and the anchor tube, the length of which is determined by calculation. The invention allows the wiring well with minimal deviations from the design profile. 1 Il.

The device for stabilization of the whipstock relates to the field of drilling deep oil and gas wells and can be used to guide and stabilize the downhole motor standoff.

A device that includes a bit, a basic element in the form of a clamp or centralizers, volumetric hydraulic motor located above the downhole motor locking retainer Assembly with hydraulically retractable in the direction opposite to the action of the lower decentralizer towards the support-centering elements (1). Fixing S="ptx2">

The known device is intended for drilling a curved borehole portions. When creating an axial load on the bit is the longitudinal bending of hull volumetric hydraulic motor, which provides for intensive cutting-reference-centering elements of the device in the borehole wall. This significantly hampered the movement of the drill string in the direction of drilling.

A device for stabilizing the position of the whipstock during drilling of inclined sections of the wellbore, including the bit, downhole motor-diverter, the fixing unit of the whipstock relative to the borehole wall, heavy-weight drill pipe (2). The fixing unit of the whipstock includes a housing, a hydraulic unit with retractable elements in the form of cones reinforced with carbide teeth.

The disadvantage of this device is the low retention capacity of the cones, especially in loose rocks. Under the action of the reactive torque on the bit and torsional vibrations in the lower part of the drill string diverter can be rotated around its axis in the direction of action of the reactive torque on the engine of the whipstock. When this wellbore deviates from pagini due to the stabilization of the engine-standoff in the direction of curvature of the wellbore.

The problem is solved due to the fact that the device for stabilization of the whipstock, including engine-the whipstock with the fixing unit and the bit, the fixing unit is made in the form of a support tube with a hinge spatial type, located between the engine-the whipstock and the anchor tube, the length of which is selected from the formula:

< / BR>
where L, d is the length and diameter of the pipe, respectively, m;

R is the radius of curvature of the wellbore, m;

D - diameter bits, m;

Q - transverse component of the weight of a unit length of the support pipe, kN/m;

EJ - bending stiffness of the support pipe, kN/m2.

The invention consists in the following. Thanks to the fixing unit in the form of a support tube with a hinge spatial type, located between the engine - the whipstock and the anchor tube, the length of which is selected from the relation [1], is achieved by the alignment of the diverter with a chisel in the direction of curvature of the well and provided the posting process aimed the barrel with minimal deviation from the design profile.

The drawing shows a General view diagram of the proposed device for the stabilization of the standoff, including the bit 1, the engine is associated with a column of drill pipe 5.

The operation of the device for stabilization of the whipstock is as follows.

Depending on the design of the radius of curvature of the borehole and the diameter of the drill bit 1 is selected and installed in Assembly with hinge spatial type 3 support pipe 4, the length of which is determined from the relation [1].

Support pipe 4 with an estimated length orients the engine-diverter 2 bit 1 in the direction of the curvature of the borehole, occupying a position in which its lower part rests on the well wall including A middle portion including B and the upper including C (Fig. 1). When drilling occurs jet engine torque-whipstock 2, under which the latter tends to rotate around its axis. The rotation of the engine is whipstock 2 prevents the supporting tube 4, which captures the joint spatial type 3 in T. A. Based on the stiffness of the support pipe 4, the diameter and effective length are excluded bend it in the most loaded section (corresponds to T. B Fig. 1) as a result of the reactive torque of the motor-whipstock 2.

Support pipe 4 does not obstruct the movement of the drill string 5 in the direction of drilling.

Installed between the engine-ukleinoy column 5 in the wellbore during tripping.

Device for stabilizing the diverter will allow you to post the wells with minimal deviations from the design profile that will significantly reduce the financial costs of well construction and increase the turnaround time on stage.

Sources of information:

1. Pat. USA 3561549, MKI E 21 IN 7/06, NCI 175/76.

2. A. C. the USSR 294923, MKI E 21 7/10.

The device for stabilization of the whipstock, including the bit, the engine of the whipstock with the fixing unit, wherein the fixing unit is made in the form of a support tube with a hinge spatial type, the latter is located between the engine-the whipstock and the anchor tube, the length of which is selected from a ratio

< / BR>
where L, d is the length and diameter of the pipe, respectively, m;

R is the radius of curvature of the wellbore, m;

D - diameter bits, m;

Q - transverse component of the weight of a unit length of the support pipe, kN/m;

EL - bending stiffness of the support pipe, kNm2.

 

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