RU93869U1 - SECURITY LOAD DEVICE - Google Patents

Abstract

 Safety load device, comprising a housing, cup springs, characterized in that, in order to protect the destructive and cutting tools from exceeding axial loads and torque, it includes a spline shaft with a through hole, a shank with radial holes, a thrust bearing, a sealing element and a unit a cutting device that protects against breakage when the torque is exceeded, consisting of a hollow shaft, a housing, a thrust bearing, balls installed between two gear and disks, Belleville springs, adjusting screws and sealing elements.

Description

The utility model relates to the field of the oil and gas industry, in particular to downhole devices that protect the destructive and cutting tools from breaking when axial loads and torque are exceeded during drilling and cutting of the casing string, and will also find application in mechanical engineering. Will find the greatest application when creating technological windows in casing strings for drilling sidetracks, isolating formations and eliminating wells.

Known safety clutch on Av.St. USSR No. 323578, safety clutch on Av.St. USSR No. 360486, ball safety coupling according to Av.St. No. 334418, cardan safety clutch according to patent RU No. 62680.

The disadvantages of these couplings is a narrow scope due to:

- the absence in the design of the channel for flushing fluid and drilling fluid, which makes it impossible to use these devices in downhole assemblies;

- the inability to control and protect destructive and cutting tools, chisels, cutting devices, etc. from axial loads.

Known safety clutch on Av.St. USSR No. 712556, containing the leading and driven half-couplings and mounted longitudinally elastic elements placed in the outer grooves of the driven half-coupling and the adjusting element, in order to increase durability and smoothness of operation, the elastic elements are made in the form of cable segments fixed at one end to the adjusting element and the other - on the leading coupling half.

The disadvantages of this coupling is a narrow scope, due to:

- the inability to control the axial load on the destructive and cutting tools, which can lead to its breaking;

- insufficient work efficiency associated with the need for additional tripping and lowering operations (STR) to return the cable segments to the working position when the torque value is exceeded during drilling.

Known layout of the bottom of the drill string according to patent RU No. 2021485, including a bit, a downhole motor and weighted drill pipes with nodes of their connection containing a coupling and a nipple, in order to increase the efficiency of eliminating sticks with a significant area of contact of the pipes with the walls of the well by rotating the stuck string in parts , the nipples of the nodes of the connection of the elements of the arrangement are fixed relative to the couplings in the initial position by shear locking elements, and the thrust ends of the nipple and the coupling form a gap.

The disadvantages of this arrangement is a narrow scope due to:

- the inability to control the axial load on the destructive and cutting tools;

- insufficient work efficiency due to one-time use, due to the need to replace the shear locking tool, which requires additional STR.

Closest to the design solution to the proposed utility model is the damping damper according to the patent RU No. 844441, comprising a cylindrical body with a head, a tubular rod attached to the head, disk springs and a tip placed on the rod, the connection of the body to the head is made by key, and the dowels are inserted into through radial openings of the housing from the inside, the ends of the head and tip, on which the Belleville springs are supported, are made with radial grooves for the circulation of fluid inside the housing, between a ring compensator made of an elastic material, for example, caprolon, is placed along the axis with a tip and a rod.

The disadvantages of this damping dampener is a narrow scope due to:

- the impossibility of controlling the axial load on the destructive and cutting tools, since it is intended only to absorb dynamic loads on the drilling tool;

- the impossibility of protecting destructive and cutting tools from exceeding specified torque values.

The technical result of the proposed utility model is to expand the technological capabilities of the device while increasing the reliability and safety of its operation and expanding the scope.

The technical result is achieved by solving a technical problem aimed at improving the manufacturability of the device.

The stated technical problem is solved due to the fact that a spline shaft with a bore, a shank with radial bores, a thrust bearing, and a sealing element are included in the device, which includes a housing, cup springs, in order to protect the destructive and cutting tools from exceeding axial loads and torque and a unit that protects against damage the cutting device when the torque is exceeded, consisting of a hollow shaft, a housing, a thrust bearing, balls installed between two belt disks, Belleville springs, adjusting screws and sealing elements.

In FIG. safety load device is presented.

The safety load device is rigidly attached to a destructive or cutting tool (not shown in Fig. 1) and consists of a spline shaft 1 (Fig. 1) with a through hole, a shank 2 with radial holes, a housing 3, which in the upper part ends with a sleeve with splines , Belleville springs 4, thrust bearing 5, sealing elements 6 and node 7, which protects against excess torque.

The node 7, which protects against excess torque, consists of a hollow shaft 8, a housing 9, a thrust bearing 10, balls 11 mounted between two gear discs 12, disk springs 13, adjusting screws 14 and sealing elements 15.

The force of excess torque is transmitted to the gear discs 12, one of the discs is rigidly fixed in the housing 9, and the other (movably) on the hollow shaft 8. Between the gear discs are mounted balls 11 that transmit torque. The required torque is regulated by screws 14.

The device operates as follows.

If the permissible vertical load on the destructive or cutting tool is exceeded, due to the partial unloading of the weight of the pressure pipes, the weight force is transmitted through the splined shaft 1 to the disk springs 4, as a result, the spring is compressed and the splined mesh is disconnected, while the vertical movement of the column is compensated and the rotation transmission is interrupted to the cutting device.

Simultaneously with the separation of the splined engagement, the radial holes in the splined shaft 1 are combined with the hole in the housing 3, the flushing fluid will begin to flow through them into the well, which in turn will lead to a sharp drop in pressure in the pressure column.

The pressure drop of the flushing fluid at the mouth, at its constant flow rate, will indicate the excess of the permissible vertical load.

When the torque is exceeded by the destructive or cutting tool, an axial force arises, which is directed upwards. Under the action of this force, the movable toothed disk 12 overcomes the compression force of the Belleville springs 13 and disengages the engagement and stops transmitting rotation to the cutting device.

Using the proposed utility model provides the following advantages:

- the ability to control the axial load on the destructive and cutting tool while protecting it from exceeding a predetermined torque value, which avoids breaking the working destructive and cutting tool;

- the scope of application is expanding;

- increases the efficiency of the device.

The estimated economic effect of using the proposed safety load device depending on the depth of the well will be from 0.1 to 0.5 million rubles.

Claims (1)

Safety load device, comprising a housing, cup springs, characterized in that, in order to protect the destructive and cutting tools from exceeding axial loads and torque, it includes a spline shaft with a through hole, a shank with radial holes, a thrust bearing, a sealing element and a unit a cutting device that protects against breakage when torque is exceeded, consisting of a hollow shaft, a housing, a thrust bearing, balls installed between two gear and disks, Belleville springs, adjusting screws and sealing elements.