RU2588246C1 - Armature of hydraulic jack for installation of expandable shutter in well - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to devices for fixation of equipment in well and can be applied in downhole hydraulic jack. Anchor includes: hollow housing with tapered recesses and upper thread for connection with pipe string, inserted from below telescopically; hollow pusher, capable to longitudinal upward movement upon housing, with lower thread for connection to hydraulic jack, and guides for billets with inclined surfaces inside, configured to displacement upwards along tapered recesses together with pusher, which backs them from below, radially movable along guides; and resilient element pressed from above by housing, and from below by stop. Stop is being formed as washer resting from below to upper ends of billets. Resilient element is made in form of compression spring arranged to rest on housing above tapered recesses. Hollow housing is arranged to communicate only with external space. Spring compression force is being selected sufficient for return of hydraulic jack in working position.

EFFECT: higher efficiency and reliability of anchor.

1 cl, 1 dwg

Description

The invention relates to the oil and gas industry, in particular to devices for fixing equipment in the well, for example hydraulic jacks.

The well-known "Anchor for fixing equipment" (patent RU No. 2434116, IPC ЕВВ 23/00, 23/06, publ. Bull. No. 32 of 11/20/2011), including a cone connected with a pipe string with slips, a housing with a latch and a pipe mounted outside the housing with the possibility of limited longitudinal movement down, pressed by a spring from the housing down and provided with an annular groove under the retainer inside. In this case, the cone is rigidly connected to the housing, on the outer surface of which a sample is made for the retainer, made in the form of a spring expansion ring, the spring is installed between the upper and lower stops, which are made with the possibility of support, respectively, on the nozzle and the housing in the transport position, in which the shear is fixed element, and the pipe is made abutting from below on the slips, which are made with the possibility of radial movement relative to it, while the latch is made with the possibility of entering the proto ku nozzle with compression springs.

The disadvantages of this anchor are:

- the inability to reuse the anchor in one round trip, as there is a shear element and a latch in the form of a retaining ring;

- the impact on the lower pressure pipe inside the central channel of the armature, which leads to the fact that it begins to move downward relative to the body and pulls the slips along, and there may be an unbalancing effect.

The closest in technical essence and the achieved result is "Anchor of a hydraulic jack for installing a profile shutoff in the well" (patent RU No. 2495220, IPC ЕВВ 23/06, publ. Bull. No. 28 from 10.10.2012), including a hollow body with a top thread for connection to the pipe string, retractable dies and lower thread for connection to the hydraulic jack. In this case, the lower thread is made on a hollow pusher, telescopically inserted from below with the possibility of longitudinal movement upwards on the body, on which cone samples are made, tapering downwards, and the dies are equipped with inclined surfaces inside, made with the possibility of moving upward along the conical samples of the body, with which they are supported from below with the possibility of radial movement, moreover, elastic elements are placed inside the pusher, which are pressed from above by the housing, and from below - by a stop with a sleeve located inside and elastic elements and inserted into the housing with the possibility of longitudinal movement, and pusher bottom is equipped with an adjusting screw, urging abutment.

The disadvantages of this anchor are:

- elastic elements made in the form of rubber cuffs that have a short service life (can crack, tear), and also do not immediately take their original shape after unloading, which can lead to spontaneous anchoring during the descent of the tool. Also, the design of the anchor with such elastic elements requires large overall dimensions;

- the existing communication of the central channel of the housing with the internal cavity of the pusher, at a certain pressure, the pusher begins to move down along with the dies and razkaryanie may occur.

The technical task of the invention is the creation of such an anchor design that will eliminate spontaneous anchoring during the descent of the equipment into the well during repeated operations, securely fix it in a predetermined interval regardless of the pressure drop inside the anchor, guaranteed to return jammed anchor elements to the transport position and reduce overall the size of the device, which will save on materials.

The technical problem is solved by a hydraulic jack anchor for installing an expandable shutter in the well, including a hollow body with cone selections and an upper thread for connecting to a pipe string, telescopically inserted from below with the possibility of longitudinal movement upward on the hollow pusher body with a lower thread for connection with a hydraulic jack, and guides for dies with inclined surfaces inside, made with the possibility of movement along the cone samples of the housing up together with a pusher, which is supported from below with the possibility of radial movement along the guides, and an elastic element, pushed from above by the housing, and from below - by emphasis.

What is new is that the emphasis is made in the form of a washer resting from below on the upper ends of the dies, the elastic element is made in the form of a compression spring mounted with the possibility of support on the casing above the cone samples, the hollow casing is made with the possibility of communication only with the outer space, with this force spring compression is selected sufficient to return the hydraulic jack to its working position.

The drawing shows an anchor with an axial section in the transport position. Technical elements and technological connections that do not affect the performance of the structure are not shown in the drawing.

The anchor includes a hollow body 1 with an upper thread 2 for connection with a pipe string (not shown) and a lower thread 3 for connection with a hydraulic jack made on a hollow pusher 4, which is telescopically longitudinally inserted upstream of the housing 1, on which cone samples 5, tapering downward and interacting with the inclined surfaces 6 of the inside of the retractable dies 7 with the possibility of moving along the cone samples 5 of the housing 1 upwards with the hollow pusher 4. Moreover, the retractable dies 7 soy ineny bottom with a hollow plunger 4 the guides 8 with the possibility of radial displacement thereon. Above the dies 7, an emphasis 9 is installed, made in the form of a washer, resting on the lower ends of the dies 7 from below, and an elastic element 10 made in the form of a compression spring is mounted on the housing 1 above the cone samples 5 with the possibility of support. The hollow body 1 is made with the possibility of communication with the outer space only through holes 11 on the hollow pusher 4, and to exclude the influence of pressure on the hollow pusher 4, a sealing element 12 is installed at the bottom of it.

The device operates as follows.

An arrangement (not shown) - a drill pipe string, an anchor, a hydraulic jack, a mandrel and an expandable (profile or cylindrical) shutter are lowered into the well to the required interval and the shutter (not shown) is expanded with hydraulic pressure, as a result of which it is pressed against the well walls and fixed.

In order to prevent the unauthorized exit of the dies 7 from the transport position to the working position during the descent of the assembly into the well, on the hollow body 1 above the cone samples 5 with the possibility of support from below on the stop 9, and on top of the hollow body 1, an elastic element 10 is installed.

Then relieve pressure and continue unloading the tool. When the mandrels reach the sections of the expandable overlap, requiring additional effort, for example, distributing and calibrating cylindrical sections and threaded joints or profile sections (not shown), the pipe string is unloaded. As a result, the cylinders and pistons of the hydraulic jack are shifted, moving the hydraulic jack into the working position. The compression force of the elastic element 10 is selected sufficient to return the hydraulic jack to its working position and to exclude the spontaneous exit of the dies 7 from the transport position to the working position.

With further unloading, the hollow body 1 connected to the pipe string by the thread 2, overcoming the force of the elastic element 10 through the stop 9, begins to move downward relative to the hollow pusher 4 connected by the thread 3 to the hydraulic jack. In this case, the dies 7 connected from below to the hollow pusher 4 by the guides 8, interacting with the inclined surfaces 6 with the corresponding conical samples 5 of the housing 1, expand in diameter, as a result of which the anchor is fixed relative to the walls of the production casing. Then in the pipe string create excess pressure, which transfers force to the pistons of the hydraulic jack, and the mandrel begins to calibrate the cylindrical and threaded sections. Moreover, the stronger the hydraulic jack body presses on the hollow pusher 4 of the anchor, the stronger the dies 7 are fixed relative to the walls of the well or profile overlap. The hydraulic pressure generated inside the hollow body 1 is transmitted only to the pistons of the hydraulic jack, and the sealing element 12, installed in the lower part of the hollow pusher 4, protects against unauthorized transmission of this pressure to the hollow pusher 4, thereby preventing the effect of decontamination.

After distributing the threaded or cylindrical section of the expandable overlap with the mandrel, excess hydraulic pressure is released and the pipe string is pulled up. In this case, the dies 7 are mixed down along the cone samples 5 of the housing 1 due to the reaction of the borehole walls and the action of the elastic element 10 and return to the transport position. Next, the layout is lowered to the next threaded connection or expandable section and the operation is repeated.

Since the elastic element 10 has a long service life and retains its working properties for a long period, when the device is repeatedly activated, spontaneous jamming is eliminated when the tool is lowered into the well.

The proposed design of a jack jack anchor for installing an expandable overlap in the well eliminates spontaneous anchoring during the descent of the equipment into the well during repeated operations, reliably fixes it in a predetermined interval regardless of the pressure drop inside the armature, guaranteed to return jammed anchor elements to the transport position and reduce overall dimensions devices, which will save on materials.

Claims (1)

An hydraulic jack anchor for installing an expandable shutter in a well, including a hollow body with cone selections and a top thread for connecting to a pipe string, a hollow pusher with a lower thread, longitudinally moving upward on the body, telescopically inserted from the bottom for connection with a hydraulic jack, and guides for rams with sloping surfaces inside, made with the possibility of movement along the cone samples of the housing up together with a pusher, which are supported from below with the possibility of radial further along the guides, and an elastic element pushed from above by the housing, and below by an emphasis, characterized in that the emphasis is made in the form of a washer resting from below on the upper ends of the dies, the elastic element is made in the form of a compression spring mounted with the possibility of support on the housing above the conical of samples, the hollow body is configured to communicate only with the outer space, while the compression force of the spring is selected sufficient to return the hydraulic jack to its working position.