RU2531688C1 - Packer for open boreholes - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used in packers for sealed isolation of borehole intervals in uncased hole. Packer comprises barrel, union, seal with conical supports and slips. Slips are shaped to trapezoidal rod. One end of top and bottom slips is articulated in top and bottom thrusts while slip opposite end extending outward is streamlined. Conical surface of conical supports and slip surface in contact with that of the latter have rectangular ledges. Slips are permanently pressed against the conical support by leaf springs. Packer is equipped with assembly for protection against spontaneous landing. Said protection assembly consists of the bush with groove to receive split ring rib extending over the entire outer surface thereof.

EFFECT: ruled out seizure of packer, free displacement of packer in borehole, decreased sizes and weight.

1 dwg

Description

The invention relates to the oil industry, namely to packers for tight separation of the intervals of the borehole in an open hole, for various technological operations, for example, testing open-hole wells, trial operation of formations in sidetracks stacked with stable rocks, acid treatment under pressure.

The well-known hydraulic packer ПГЯ-215 is designed for temporary separation of interlayers from overlying strata in an open wellbore, their hydraulic crimping, determination of absorbing intervals of the wellbore manufactured by the NSL Company (http://firma-nsl.ru/products/default_18.html) .

Known hydromechanical packer PMS-GM for tight isolation of the annular space in an open hole in a well produced by Yugson-Service LLC (http://www.yugson.ru/catalog/packer-equipment/packers-hvdromechanical/14.html).

The well-known hydromechanical packer PGM-195, designed for installation in uncased oil and gas wells in the study and isolation of absorption zones, produced by the Botkin Plant trading house. The packer consists of three main nodes: anchor, sealing and choke (http://oil.topol.ru/info.php?str=prod&pgm=load&prid=60&kid&20&pkid=24).

A disadvantage of the known packers is that they are installed hydraulically in the well by overpressure in the pipes. This principle of installing a packer is not feasible in some technological operations, for example, when testing formations. In addition, in these packers there is no pass-through channel for passing geophysical instruments.

Known packer PTsRO-2 for tight shutoff of the annular space of the test interval from the rest of the wellbore, produced by NPF Packer LLC (http://npf-paker.ru/katalog/173/2468/).

Known packer selected for the prototype, containing the barrel, a sealing element with cones, placed on the cones of the die with conical outer surfaces on the end parts, the upper and lower sub (coupling and nipple), rigidly connected with the sub adapters of the sleeve with protrusions on the inner surfaces for engagement with dice. There are fingers on the dies, and grooves on the protrusions of the bushings. The end parts of the upper and lower sub are equipped with nests radially located inside the sub, in which the free ends of the spring are placed. The dies are in interaction with the stops and are pressed against the barrel by springs. On the stops are installed with the possibility of interaction with them discs. The discs have centering fingers rigidly connected to each other by the disc. The free ends of the centering fingers are located in the nests of the sub. The trunk with the upper sub has the possibility of axial movement relative to the lower sub and the possibility of torque through the key (RF patent No. 2044863, publ. 09/27/1995).

The disadvantage of the packer according to the patent of the Russian Federation No. 2044863 and the PTsRO-2 packer is the complexity of the design of the dies, which makes it difficult to process them on machines. The disadvantages also include the execution of the outgoing end of the dies, of a rectangular shape, which can lead to a packer sticking due to the engagement of the dies with the caverns in the open barrel.

The technical result of the claimed invention is to prevent the packer from sticking, providing increased packer patency on the open wellbore, eliminating the possibility of spontaneous, premature installation of the packer at low compressive loads, ensuring the movement of the dies in the radial direction along a given path, reducing the dimensions and metal consumption of the packer.

The technical result is achieved by the fact that:

- the dies are made in the form of a trapezoidal rod, with one end of the dies pivotally attached to the body, and the other end of the dies facing out is streamlined, the conical surface of the conical supports and the surface of the dies in contact with the conical surface of the conical supports have rectangular steps, and the dies are constantly pressed against the conical support by spring springs, while the packer is equipped with a protection unit against premature spontaneous landing, consisting of a sleeve with a recess, which includes a split shoulder th ring made on the entire outer surface of the split ring.

The hinged fastening of one end of the dies, made in the form of a trapezoidal rod, to the body will allow the dies to move in the radial direction along a predetermined path.

The execution of the other end of the dies, going out, streamlined shape will prevent the packer from sticking due to the engagement of the dies for the caverns in the open trunk.

The presence of rectangular steps on the conical surface of the conical supports and on the surface of the dies in contact with the conical surface of the conical supports will allow reliable compression of the sealing element by creating a stop of the dies in the conical supports.

Equipping the packer with a protection unit against premature spontaneous landing, consisting of a sleeve with a recess, which includes the collar of the split ring, made on the entire outer surface of the split ring, will allow for increased patency of the packer along the open borehole by eliminating the possibility of spontaneous, premature installation of the packer.

The packer diagram is shown in the drawing.

The packer includes a barrel 1, rigidly connected in the upper part to the sleeve 2. A sealing element 3 is mounted on the barrel 1, which can be made integral, for example, of two or three parts. Upper and lower conical bearings 4 and 5, respectively, are mounted above and below the sealing element 3, mounted movably relative to the barrel 1. Inside the sleeve 2, upper dies 6 are mounted, resting on the conical part of the support 4. The stop 7 is fixed in the sleeve 2 by means of a screw 8. Spring the springs 9 are mounted on the dies 6 by means of screws 10. Below the sealing element 3, inside the adapter 11 are lower dies 12 based on the conical part of the lower support 5. The upper 6 and lower 12 dies are made in the form of a trapezoid rod distant form. One end of the upper 6 and lower 12 dies is pivotally mounted respectively in the upper 7 and lower 13 stops. The emphasis 13 is fixed in the adapter 11 by means of a screw 14. Spring springs 15 are mounted on the dies 12 by means of screws 16. Due to the spring springs 15, the dies 6, 12 constantly tend to press against the barrel 1. The other end of the upper 6 and lower 12 dies, which emerges outward, is made streamlined shape, which eliminates the packer sticking due to the engagement of the dies for the caverns available in the open trunk. The conical surface of the conical supports 4, 5 and the surface of the dies 6, 12 in contact with the conical surface of the conical supports 4, 5, have ledges of a rectangular shape 17, 18.

Such components of the packer as an adapter 11, a cylinder 19, a housing 20, a nipple 21, fingers 22 for fixing the cylinder 19 in the nipple 21, the sleeve 23 are rigidly interconnected and form a housing that can move relative to the barrel 1 along the axis of the product, and their relative rotation is excluded due to the key connection. The dowels 24 are installed in the socket of the tip 25 with the possibility of movement along the bore of the cylinder 19. The dowels 24 are designed to transmit torque and provide free movement of the barrel 1 up and down along the axis of the packer. The tightness of the gap between the barrel 1 and the body part is ensured by means of o-rings 26 installed in the liner 27 and in the nipple 21. Inside the body 20 there is a node to protect the packer from premature spontaneous landing under small compressive loads. This assembly consists of a sleeve 23 with a recess, which includes the collar 28 of the split ring 29. The collar 28 is made on the entire outer surface of the split ring 29. The split ring 29 is located in a ferrule 30 connected to a tip 25 attached to the bottom of the barrel 1.

The packer is lowered into the well on drill or tubing to the required depth with or without an anchor and / or together with other equipment (not shown in the drawing) depending on the planned activities. During tripping operations, the upper 6 and lower 12 dies are constantly pressed against the barrel 1, respectively, due to spring springs 9, 15.

To transfer the packer to its working position, an axial compressive load is created with emphasis on the bottom or the downstream anchor. When the maximum load is exceeded, the split ring 29 is compressed and moving down, the shoulder 28 of the split ring 29 disengages from the sleeve 23. Under the action of the compressive load, the sealing element 3, increasing to the inner diameter of the well, seals the under-packer zone. At the same time, the upper 6 and lower 12 dies move in the radial direction until fixation with the rocks of the open trunk is achieved. Packing occurs.

To transfer the packer to the transport position, the packer is raised. In this case, the upper 6 and lower 12 dies are moved to the transport position. The sealing element 3 takes its initial position.

The application of the invention will prevent the packer from sticking, provide increased packer cross-flow through the open wellbore, eliminate the possibility of spontaneous, premature installation of the packer at low compressive loads, ensure that the dies move in the radial direction along a given path, reduce the size and metal consumption of the packer.

Claims (1)

A packer including a barrel, a coupling, a nipple, a sealing element mounted on the barrel with conical supports, dies, characterized in that the dies are made in the form of a trapezoidal rod, with one end of the dies pivotally attached to the body and the other end of the dies facing out streamlined, the conical surface of the conical supports and the surface of the dies in contact with the conical surface of the conical supports have rectangular steps, and the dies are constantly pressed against the conical support by spring springs, at The packer is equipped with a protection unit against premature spontaneous landing, consisting of a sleeve with a recess, which includes a collar of a split ring made on the entire outer surface of the split ring.