UA67851C2 - Calibrating reamer of the mouth of a well - Google Patents

Abstract

This invention relates to drilling wells, in particular to the reaming calibrating units. The reamer of the well stem has cylindrical housing with eccentric circulation axial channel, junction threading, contact surface. The contact surface is armored with wear-proof insertions. The housing is made continuous-coupled and comprises the back truncated cone and cylindrical top. The wear-proof insertions on the contact surface are placed in chess order on the inclined to the axis of rotation lines. Each insertion is installed on an elastic toe in a socket of the housing. Productivity of the reamer is increased due to springy reception of impact loads to wear-proof insertions.

Description

Description of the invention

The invention relates to the field of drilling oil, gas and thermal wells, namely, to 2 expanding calibration devices that are part of the drill string.

The well-known expander is a centerer (a.s. Mo346471 M.Kl. E218В18/20, Byul. Mo23 dated 04/28/1969), which contains an inner and outer bushing, interconnected by two rows of locking ball bearings, the inner bushing has a cam protrusions located vertically along the sleeve, and in the ribs of the sleeve there are movable rods reinforced with hard alloy pins. 70 One of the disadvantages of this device is that an eccentric connection (cam mechanism) serves as a mechanism for increasing the diameter and as a safeguard against rotation of the outer sleeve, which, when rotating the column, creates a significant impact on the wall of the wellbore along the entire working plane, and this can lead to destruction of the outer sleeve. In addition, shock loads during the drilling process cause destruction and abrasive wear of carbide inserts, which leads to a lack of contact with the well wall and a decrease in its efficiency.

The closest in technical essence and the result achieved to the proposed invention is a calibrator (a.s. Mo1148960 M. Cl. E21IV 10/30, Byul. Mo13 dated 04.07.1985), which has a case with inserts resistant to triggering, protruding beyond the dimensions of the housing and forming a working surface due to the constant contact of wear-resistant inserts with the wall of the well, part of the perimeter of the housing is made with a radius equal to the radius of the bit, and wear-resistant inserts are located on the part of the housing that forms a sector with a central angle of 0"x Ф" 1802, while the radius of the working surface of the calibrator is selected in the ratio

Eck!

K., sch where: Ku - radius of the bit;

CC - the radius of the working surface, which ensures the fitting of the calibrator into the borehole. at

The disadvantage of this device is that the wear-resistant inserts are rigidly installed on the contact working surface of the cylindrical body, and due to the action of the inertial force during the rotation of the body, during the drilling process, they perceive shock loads that are subject to destruction, and the performance of the device decreases. -

The task of the intended invention is to increase the productivity and reliability of the device.

In order to solve the problem set in the calibrating expander of the wellbore, which contains a cylindrical body, with an eccentrically executed axial circulation channel in it, combined with the axis of rotation, connecting threads, a contact surface reinforced with wear-resistant inserts, according to the invention, the body is made of solid-coupled and consists of an inverted truncated cone and a cylindrical -

Зз5 Vertices, and on the contact surface, wear-resistant inserts are arranged in a checkerboard pattern on inclined straight lines to the axis of rotation and each insert is installed on an elastic hanger in the body socket, while longitudinal washing grooves are made on the contact surface.

Fig. 1 shows the device in the initial position, general view.

Fig. 2 is also a side view. "

Fig. 3 shows view B in Fig. 1 (wear-resistant inserts are conditionally not shown). шщ с Fig. 4 - section A-A in Fig. 2. y Calibrating expander of the wellbore, containing a solidly paired body 1, consisting of "" reverse truncated cone 2 and the upper cylinder З, with an axial circulation channel 4 eccentrically executed in it, the axis 04-04 of which is also the axis of rotation. For joining the elements of the drill

Columns (conditionally not shown, see fig. 1), body 1 along the axis of rotation, equipped with threaded nipple 5,

Ф is located at the base of the case with an internal connection slot 6. The contact working surface 7 of the case 1 is reinforced in a staggered manner with wear-resistant inserts (see Fig. 2) to achieve smooth contact with it. by the collapsing wellbore wall, wear-resistant inserts 8 are located on inclined lines to the axis

Go) rotation. Since the wear-resistant inserts 8, due to the action of inertial forces during rotation, perceive impact 5p loads, they are installed on elastic hangers 9 in the sockets 10 of the body 1, and each of them is fixed with the i-th threaded sleeve 11 (see Fig. 3) . Parallel to the inclined straight lines of the location of wear-resistant inserts, longitudinal washing grooves 12 (see Fig. 4) are made on the working - M surface 7, for the removal of mechanical particles of the rock by the circulation of the drilling fluid. When rotating the device, the point of the working surface 7, at the base of the body 1, describes a circle with a radius K equal to the circumference of the bit, and the point of the working surface of its top describes a circle with a radius Ko

Corresponding to the calculated circumference of the wellbore.

The calibrating expander is inserted into the drill string assembly above the bit and lowered into the well.

F) During the rotation of the drill string, during the drilling process, due to the force of inertia and due to the roundness of the working surface 7, the expander is pressed against the wall of the wellbore and the wear-resistant inserts destroy the rock, which is carried along the washing grooves 12 by the circulation of the drilling fluid. Since the operation of the drill bit is accompanied by vibration, the inertial forces of the device impulsively act on the barrel wall, and the wear-resistant inserts 8 absorb shock loads. Preventing the destruction of wear-resistant inserts 8 is served by elastic heel pads U, which soften the impact and increase the performance of the device. The expansion of the wellbore is ensured by the operation of the return cone 2 and the calibration of the cylinder 3. 65 Such a technical solution significantly increases the speed of penetration of the bit while preserving the diameter of the well, and the improved stabilization of the bottom of the drill string significantly increases the life of the bit.

The proposed device is used to expand the shaft in the process of drilling inclined and vertical oil and gas condensate wells.

Claims (1)

2 The formula of the invention Calibration expander of the wellbore, containing a cylindrical body with an eccentric circulation axial channel, which is combined with the axis of rotation, connecting threads, a contact /o surface, reinforced with wear-resistant inserts, which is characterized by the fact that the body is made of a continuous pair and consists of a reverse a truncated cone and a cylindrical top, and the wear-resistant inserts on the contact surface are arranged in a checkerboard pattern on straight lines inclined to the axis of rotation, and each insert is installed on an elastic hanger in the body socket, while longitudinal washing grooves are made on the contact surface. s schi 6) «- iv) s y (Se) - and? (22) -i (ee) 1 - ime) 60 b5