SU899820A1 - Device for locating the inserted instrument in drill pipe string - Google Patents

Description

(54) DEVICE FOR DETERMINATION

INSTALLATION TOOL PLACES

IN COLUMN OF DRILL PIPES

one

The invention relates to a drilling technique and can be used when drilling wells with the method without lifting pipes with a plug-in tool.

A device is known that includes a string of drill pipes and a seat in the column shoe, in which, when the insertion tool is lowered down and seated in the drill string, the pressure in the discharge lines increases, increasing by the amount of pressure difference in the insertion tool 1.

The disadvantage of such a device is that the local resistance (saddle) to the movement of the inserted tool is located only in the shoe of the column, which allows fixing only the final point of transportation of the inserted tool, excluding control as the tool moves in the column. Another disadvantage of such a device is that it cannot be located anywhere on the pipe string, since it does not allow the insertion tool to pass through it.

The closest in technical essence to the present invention is a device comprising a housing with internal annular bores and a sleeve that is limited axially movable in the axial direction with elastic plates having alternating protrusions and concave portions on the outer surface. 5 The device, besides its main purpose, by increasing the lifting speed of the tool insert, makes it possible to judge by the decrease in pressure in the circulation system of the valve through the tool being inserted, i.e. location of insert tool during lifting 2.

However, the known device cannot be used to give a signal when it is being passed through with a plug-in tool during the descent process.

The purpose of the invention is to obtain a signal

15 with the passage of the insertion tool in the process of descent.

This goal is achieved by the fact that the tongue of the outer projections of the elastic plates is equal to the pitch of the annular bores of the body and

20 to the magnitude of the axial stroke of the movable sleeve, the annular bores of the housing being placed at the level of the outer projections of the elastic plates at the upper location of the movable sleeve.

FIG. 1 shows the device, a general view; in fig. 2 is a resolution of AA in FIG. one; in fig. 3 — moment of passage of the inserted tool through the device when snusk; in fig. 4 - the same when lifting.

The device consists of a housing 1, installed between the drill pipe 2 and the sleeve 3, freely placed in the housing 1 and partially movable in the axial direction. Sleeve 3 has a complex configuration. Its middle part is made in the form of curvilinear elastic plates 4, the outer surface of which is made with sections 5 concave into the drill pipe 2, between which there are protrusions 6, and in the lower part are flexible petals 7. In the case 1 there are internal annular bores 8, distance between which (step) is equal to the distance (schag) between the outer projections 6 of the elastic plates and the magnitude of the axial stroke of the movable sleeve.

The device works as follows.

During the descent of the tool insert 9 to the bottom and the passage of the device (FIG. 3), the elastic plates 4 with their concave sections 5 interact with the outer surface of the tool insert 9, for example, with a downhole motor body. In this case, the elastic plates 4 are deformed, and a friction force arises on the surface between them and the insertion tool 9, for overcoming which additional force is required applied to the insertion tool 9, but since it moves under the action of hydraulic force, then when the device passes through an injection line produces an impulse of increase in pressure, which is fixed on the surface. In order to accurately register the pressure pulse, its value should be 10–20% of the nominal pressure in the pumps.

In order to provide the necessary amount of friction force and to reduce the wear of the elastic plates 4, there are several concave sections 5 on each of them, and to obtain a corresponding deformation force between them and external projections are b.

Having placed several devices in a string of pipes 2, one can have periodic information about the movement of the insertion tool 9, in particular, precisely determine the moment of transition to a reduced pump performance during descent and approach of the insertion tool 9 to the column bashmak.

Since, when lifting the insert tool 9 by the reverse circulation of drilling mud (Fig. 4), it is necessary to limit the magnitude of the rotation 1; giving in 3ii pipe space, in order for the plp1, hydraulic fracturing at the moment of installation of the inset tool 9 of the device, the device is provided with a non-displacement valve 1 up 3. The insertion tool 9 initially interacts with the petals 7 and lifts the sleeve 3 until it stops at the end of the coarse 2. In this position, the outer 1) 1 of the outer 6 is placed at the level of the annular bores 8, with the result that the length of the elastic plates 4 involved in the deformation increases and the force their deformation and frictional strength are reduced.

The use of this device to determine the location of the insertion tool will allow to have accurate periodic information about the movement of the insertion tool.

Installing the device at the column shoe will allow reducing the time spent on launching the insertion tool, preventing its damage and jamming in the shoe. Installing the device in the upper part of the drill string will increase the safety of work when gripping the tool insert during lifting.

When drilling wells with a depth of 4000–5000 m, the economic effect due to the reduction of the time for the insertion of the inserted tool roughly saves 1000 rubles per device.

Claims (2)

1. Barshay G. S. and others. Turbine drilling without lifting pipes. M., “Nedra, 1967, p. 132. 2. USSR author's certificate No. 720133, cl. E 21 V 17/00, 1977 (prototype). FIG. 2 Fig, 1  y