RU107271U1 - PACKER LANDING UNIT - Google Patents

Abstract

 1. The packer landing unit, made with the possibility of axial and radial movement along the packer barrel and comprising a housing in which slips, spring-loaded shoes and a guide pin are installed, while the trunk in the area of the landing unit is equipped with a figured groove configured to accommodate the guide pin and having an axial short and axial long sections corresponding to the transport and working positions of the packer, interconnected by a screw section for transferring the packer from the transport in working position and vice versa, characterized in that the casing is provided with longitudinal helical grooves made from the side of its outer surface, providing torque and holding the packer in the transport position during operation when an upward flow of fluid is circulated through it, and the screw section of the curly groove has a length, corresponding to at least one revolution of the guide pin. ! 2. The packer landing assembly according to claim 1, characterized in that the number of longitudinal screw grooves on the housing is made of at least three, while the grooves are made at an equidistant distance from each other. ! 3. The packer mounting assembly according to claim 1, characterized in that the screw portion of the curly groove has a length corresponding to two revolutions of the guide pin.

Description

The utility model relates to the oil and gas industry, namely, to the design of the packer, and can be used in the process of development and operation of oil and gas wells, in particular, for hydraulic fracturing, when carrying out technological operations to isolate absorption zones during well drilling, cementing under pressure, during grouting, testing the formation, as well as for tight separation of the casing.

Known mechanical packer (AS USSR N1686128, MKI: Е21В 33/12), containing a barrel with an annular curly groove on the outer surface with evenly spaced alternating longitudinal short and long sections, a support rigidly connected to the barrel, a pressure sealing element located under it and a cone mounted with the possibility of axial movement relative to the barrel, located on the barrel with the possibility of radial-axial movement of the clip with a protrusion on the inner surface, placed in an annular groove in the barrel And mounted in a holder of its circumference uniformly in slips, the spring-loaded relative to the cage in the radial direction. In this case, the packer is equipped with cams mounted on the cone, evenly spaced around in the longitudinal planes of the short sections of the figured groove at a distance from each other no less than the width of the slips, and the inner surfaces of the cams are made inclined to the longitudinal axis of the barrel with an apex of the angle of inclination of the cone surface to the longitudinal axis of the barrel while the outer surfaces of the slips in the upper part are made reciprocal inclined surfaces of the cams for interaction with the latter in the transport position of the slips.

Also known is a mechanical packer (RF patent for the invention No. 2383714, IPC: ЕВВ 33/12), which includes a rod with a rectilinear longitudinal groove, a sealing unit installed on the rod, an anchor unit and a cone located between them and having the ability to move along the rod, and also installed with the possibility of rotation and fixed from longitudinal movement relative to the rod sleeve with a system of curly grooves, having two rows of groove sections evenly spaced around the circumference. In this case, the first row of grooves consists of long sections directed along the stem and short sections of an asymmetric U-shape alternating with them, and the second row consists of short sections of an asymmetric U-shape that are shifted around the circumference by a half step relative to the sections of the first row. In both rows, one short section of a symmetrical U-shape, which are located opposite each other, is made. The sealing unit contains a sealing element made of elastic material, fitting the rod from the sides, and a stop of the sealing element located on the rod. The anchor assembly comprises a yoke mounted on the stem with the possibility of longitudinal movement and having a cylindrical shape with three pins fixed in it, one of which enters into the rectilinear longitudinal groove of the rod, and two other pins are located on one generatrix of the inner surface of the yoke, one pin of the last two the pins may fit into portions of the first row of sleeve grooves, and the other pin may fit into portions of the second row of sleeve grooves. On the side of the cage facing the sealing unit, spring-loaded slips are mounted, held by a restrictive ring, which is fixed to the cage. Each slip is a two-arm lever located along the stem, one end of which, facing the cone, has a tapered surface on the inside for contact with the cone, and on the outside has teeth for anchoring. The opposite end is connected to the clip so that the slip has the ability to radially deviate from the clip. On the outside, the slip has a guide portion for contact with the casing.

Known mechanical packer (RF patent for utility model No. 855544, IPC: ЕВВ 33/12) containing a barrel with a figured groove on the outer surface with evenly spaced alternating longitudinal short and long sections, a support rigidly connected to the barrel, a pressure-tight sealing element located under the support and a cone, which is mounted with the possibility of axial movement relative to the barrel. On the barrel is located with the possibility of axial movement of the cage with slips placed around its circumference, spring-loaded relative to the cage in the radial direction, held by a limiter and made in the form of two-arm levers. A ring is mounted in the ferrule with the possibility of radial rotation relative to the ferrule and rigidly connected with it in the axial direction. Guide pins are firmly seated on the inner surface of the ring. The packer is additionally equipped with a thrust sleeve installed in the recess made in the lower end part of the cage, and the ring consists of two half rings and is placed in the cage with a gap in the axial and radial directions.

Closest to the proposed invention is a packer (RF Patent for Utility Model No. 25757, IPC: ЕВВ 33/12), containing a mounting unit, a cone, sealing cuffs, a sleeve with a clip mounted on the barrel. The trunk of the packer in the area of the landing site is made with a curved curly groove having a long and short parts. The landing unit contains a housing with dies (slips) fixed in it, a pin that enters the figured groove, a spring-loaded centralizer (friction shoes), on the outer surface of which screw notches are made. Before lowering into the well, the pin is installed in the short part of the groove. During the descent of the packer into the well, the pin, being in the short part of the curved groove, holds the body in the transport position. Upon reaching the desired depth of packing, the tool is lifted. By turning the tool clockwise, the body is rotated 90 °, while the pin enters the long part of the groove, and screw notches made on the outer surface of the centralizer prevent the packer body from slipping along the casing. After this, the tool is unloaded to the packer. The load due to the weight of the tool through the clutch and holder is transferred to the cuffs and the cone, which wedges the dies. The cuffs are deformed and seal the annulus of the well. To transfer the packer to its initial position, the tool is raised, while the pin automatically (without rotating the tool to the left) passes from the long part of the groove to its short part. At the same time, the cuffs regain their original shape and the cone releases the dies, thereby removing the packer from the installation site.

The technical solutions listed above have a landing unit in the form of a cage (friction unit) including a case with spring-loaded shoes (dies or slips) installed therein, uniformly located around the circumference, and a figured groove located on the barrel in the area of the friction unit, the shape of which determines the trajectory moving the landing unit along the trunk of the packer, ensuring the transfer of the packer from the transport position to working However, the known solutions do not provide the required reliability of the landing unit during operation due to the possibility of the packer landing during random turns of the barrel and the possibility of independent, arbitrary transition of the packer from the transport position to the working one under the action of an upward flow of liquid, which leads to jamming of the packer in the column and, accordingly, to an emergency.

The objective of the proposed technical solution is to increase the reliability and safety of the device during its operation.

The technical result is to exclude the possibility of an arbitrary transition of the landing site (friction block) of the packer from the transport position to the working position (i.e. moving along the packer barrel) under the action of an upward flow of liquid, as well as to enable reliable automatic landing of the packer.

To solve the problem in the packer landing unit, made with the possibility of axial and radial movement along the packer barrel and comprising a housing in which slips, spring-loaded shoes and a guide pin are installed, the barrel in the seating area is equipped with a figured groove configured to accommodate therein a guide pin and having an axial short and axial long sections corresponding to the transport and working positions of the packer, interconnected by a screw section for translation akera from the transport to the working position and vice versa, according to the technical solution, the housing is equipped with longitudinal screw grooves made on the side of its outer surface, providing torque and holding the packer in the transport position during operation when an upward fluid flow is circulated through it, and the screw section curly groove has a length corresponding to at least one revolution of the guide pin. The number of longitudinal screw grooves on the housing can be at least three, while the grooves are made at an equidistant distance from each other. The helical section of the figured groove has a length corresponding to two revolutions of the guide pin.

Thus, the technical result is achieved due to the constructive solution of the packer landing unit, including the original shape of the groove located on the packer barrel, providing automatic installation and removal of the packer by transferring the guide pin (segment) from the transport position to the working position by turning the pipe string in more than one revolution (360 °). The technical result is also achieved due to the execution of the housing of the packer landing unit with longitudinal helical grooves, which prevents the upward flow of fluid during operation and, accordingly, prevents the landing unit from moving upward relative to the axis of the packer barrel.

The difference between the proposed solution and the closest analogue is the shape of the groove on the packer barrel (the figured groove on the packer barrel is made with an enlarged screw section), and the design of the housing with longitudinal screw grooves, which does not touch the walls of the casing, allows you to create a torque that holds it in transport position when circulating fluid through it. This creates a condition under which the housing of the landing unit "resists" the force of the upward flow of fluid, tending to move it up the axis of the barrel of the packer. Thus, the rotation of the housing is not controlled by the friction force from contact with the casing, but by the created torque of the fluid flow during circulation through the grooves of the housing.

The utility model is illustrated by drawings, in which Fig. 1 is a schematic illustration of a packer with a longitudinal section and designation of the main structural elements included in it, Fig. 2 is a general view of a packer, Fig. 3 is a general view of a figured groove in a packer barrel, Fig. .4 is a scan of the figured groove, in Fig. 5 is a schematic illustration of the packer assembly, in Fig. 6 is a general view of the packer assembly, in Figs. 7.-9 are a general view, longitudinal and transverse sections of the housing of the packer assembly, respectively , Fig. 10-11 is a side view and General view of the pin sedimentary unit packer.

The positions in the drawings indicate:

1 - trunk packer,

2 - landing cone,

3 - mandrel cuffs,

4 - calibration ring,

5 - hard seal

6 - soft seal,

7 - a spacer ring,

8 - pressure ring,

9 - top sub

10 - landing site

11 - slips,

12 - conical springs,

13 - housing landing unit,

14 - friction shoes,

15 - springs of the landing unit (friction block),

16 - guide font (segment);

17 - figured (screw) groove,

18 - longitudinal screw grooves,

19 is an axial short section of a figured groove (transport position),

20 - helical section of a figured groove,

21 - axial long section of a figured groove (working position),

22 - operating position of the guide pin (segment),

23 is an intermediate position of the guide pin (segment) on the screw section of the figured groove,

24 - transport position of the guide pin (segment),

25 is an intermediate position of the guide pin (segment) during transitions between the axial short and screw sections of the figured groove,

26 - the intermediate position of the guide pin (segment) during transitions between the axial long and screw sections of the figured groove.

The packer consists of a barrel 1, on which an axial cone 2 is mounted with the possibility of axial movement. A cuff mandrel is inserted in the cone 3. A calibration ring 4 is screwed onto the cone, screwed onto the cone, two rigid seals 5, spacer rings 7 and a soft seal 6. Top a pressure ring 8 is screwed onto the mandrel cuff 3. An upper sub 9 is screwed on top of the barrel. At the bottom of the packer there is a landing unit 10, in which slips 11 are installed evenly around the circumference, pressed by conical springs 12 (see Fig. 1).

The landing site of the packer 10 is a friction block with the possibility of axial movement relative to the barrel. The friction block consists of a housing 13, in which spring-loaded (by means of springs 15) shoes 14 are mounted, evenly spaced around the circumference, and held by clamps. A guide pin (segment) 16 is rigidly mounted in the housing 13 (see FIG. 1). In the housing 13 of the packer landing unit, longitudinal helical grooves 18 are made, which create a torque that holds the packer in the transport position when an upward fluid flow is circulated through it (see Fig. 6). In the lower part of the barrel, a figured groove 17 is made (see Fig. 3), while the guide pin 16 engages with the figured groove 17.

Figured groove 17 consists of an axial short section 19, a screw section 20, an axial long section 21 (see figure 4). The length of the screw portion 20 depends on the diameter of the packer barrel and should allow the guide pin to make at least one full revolution (360 °) along the surface of the packer barrel. The guide pin located in the curly groove during rotation of the pipe string is located in the axial short section of the groove 19 — the transport position, then in the axial long section 21 of the curved groove — the working position. The axial long section of the groove is long enough to compress the seals 5, 6 and to anchor the packer with the casing.

The shape of the figured groove on the packer barrel determines the path of the landing unit along the packer barrel and allows the guide pin to freely move from the transport position 24 to the working position 22 through the intermediate position 23, and in the reverse order again to the transport position.

The device operates as follows.

When installing the packer in the well, the guide pin (segment) is in the transport position 24 in the short axial section of the figured groove (see figure 4). After descent to a given depth by lifting the pipes up, the guide pin is transferred (due to friction of the friction block against the walls of the well pipes) to the intermediate position 25, after which at least one pipe revolution (360 °) is made, while the guide pin automatically goes over through the intermediate positions 23 and 26 to the working position 22. As a result, the slips 11 abut against the seat cone 2, and the seals 5 and 6 are compressed. The seals are worn on the mandrel cuff 3 and are separated by spacer rings 7. The seals 5 and 6 are pressed against the bottom tsom gauge 4, and from above the pressure ring 8. Thus there is a landing packer.

When removing the packer, the barrel 1 is lifted by 1-1.5 meters, the guide pin automatically moves from the working position 22 to the intermediate position 26. Then, after at least one turn of the pipes is completed (360º), the pin moves along the screw section of the groove, through intermediate positions 23 and 25, and with a further rise in the pipe goes into transport position 24. After that, the packer is ready to be removed.

An example of a specific implementation.

In accordance with the claimed utility model, a packer was made for hermetically isolating the intervals of the casing string. The packer was used in conjunction with a slotted perforator in the production of integrated plastic hole punching. The packer consisted of a mechanical landing assembly and a three-element sealing assembly.

The packer was characterized by the following structural and technological parameters.

Table 1 Parameter Name Value Outer diameter of the packer, mm 122 Diameter of sealing lips, mm 119.1 The outer diameter of the trunk of the packer, mm 66 The inner diameter of the housing, mm 68 Diameter on shoes, mm 136.7 Bore diameter mm 48 Packer length, mm 1635 Upper connecting thread, GOST 633-80 Tubing 73 Bottom connecting thread, GOST 633-80 Tubing B60 The pressure drop perceived by the packer
MPa fifty Working temperature ° C 120 *

In this case, the figured groove on the packer barrel was made with an axial short section of 65 mm, an axial long section of 200 mm, a screw section of 140 mm, and the screw section had a length corresponding to two pin revolutions (7200).

In the housing of the packer landing unit, three longitudinal screw grooves were made at an equidistant distance from each other along uniformly spaced with the following parameters:

The width of the groove at the base is 26.3 mm,

Groove depth - 4 mm,

Length - 310 mm

The pitch of the screw grooves is 2000 mm,

The direction of the grooves is right.

The made packer was characterized by its high reliability during its operation. No arbitrary transition of the packer landing unit (friction block) from the transport position to the working position (i.e. moving along the packer barrel) under the action of an upward fluid flow was detected, and a high reliability of the packer landing was ensured.

Claims (3)

1. The packer landing unit, made with the possibility of axial and radial movement along the packer barrel and comprising a housing in which slips, spring-loaded shoes and a guide pin are installed, while the trunk in the area of the landing unit is equipped with a figured groove configured to accommodate the guide pin and having an axial short and axial long sections corresponding to the transport and working positions of the packer, interconnected by a screw section for transferring the packer from the transport in working position and vice versa, characterized in that the casing is provided with longitudinal helical grooves made from the side of its outer surface, providing torque and holding the packer in the transport position during operation when an upward flow of fluid is circulated through it, and the screw section of the curly groove has a length, corresponding to at least one revolution of the guide pin. 2. The packer landing assembly according to claim 1, characterized in that the number of longitudinal screw grooves on the housing is made of at least three, while the grooves are made at an equidistant distance from each other. 3. The packer mounting assembly according to claim 1, characterized in that the screw portion of the curly groove has a length corresponding to two revolutions of the guide pin.