Inflated packer with swelling layer

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil and gas industry, notably, to inflated packers. It contains a packer mandrel, a packing element and a swelling material. The packing element is assembled over the packer mandrel; there is a circular gap between the packing element and the mandrel. The material is placed in the circular gap and is designed to capture at least part of medium supplied into the circular gap between the swelling material and the packing element.

EFFECT: facilitates maintaining tightness after expanding regardless of damage or change of conditions in well.

20 cl, 6 dwg

 

The present invention relates to inflatable packers or packer-stoppers, and more particularly to those which preserve the integrity after the expansion, despite the damage to the item or changing conditions in the well.

Inflatable packers usually contain elastic element attached to the packer through the fixed and movable couplings at its opposite edges. Usually use a valve system for entry of fluid under pressure in the annular space between the packer and the element that triggered the process of blowing. The blowing process allows the specified element to expand in the radial direction and come into tight contact with the surrounding pipe or borehole wall, which becomes possible due to the movement of the movable clutch up in the direction of the fixed coupling, which is usually placed near the top in the direction of the well region. The valve system includes a check valve to maintain pressure in the annular space between the packer and the element. In other types of inflatable packers, known as the annulus packers, used stationary clutch and reinforcement only at the edges of the element.

In previously known constructions expanding (swelling) environment served as a drilling mud or other fluid. The extension of such liquids has defined the governmental shortcomings. One problem associated with temperature effects, which can lead to reduced pressure on the inflated element and loss of seal. The other downside is the damage of the item, as in the installation process, and with time during the operation in the well, which can lead to rupture or crack in the element with the loss of tightness as leakage of fluid. Although the valve system to ensure the absence of excess pressure, the risk of compromising the integrity of the element remained real, what has happened, leading to the adverse outcome.

In attempts to improve the parameters of inflatable packers as expanding environment applied cement mortar. The idea was that the solution to the consistency suitable for pumping, was fed under pressure into the annular space between the packer and the element. The solution is then hardened, and it was hoped that after the solidification of the solution, now in the solid state, will contribute to the preservation of the integrity of the packer even in the event of failure of the element. However, the introduction of cement has raised several new issues. First, there were additional risks by applying the solution through the various valves of the input node associated with their pollution. Secondly, the use of cement requires the Alicia specialized equipment on the surface. In some cases, especially those related to production areas, there are logistical problems with the delivery of such equipment on the platform, and these problems lead to an increase in the cost of the final product. In addition, when using cement mortar significant was the formation of clots and the complexity of the pumping solution under the item. It was also important to quickly remove the excess cement to avoid the necessity of drilling, in the case of interference to subsequent operations. If you do not take into account all these considerations, it was still one negative side to the use of cement mortar. The cement slurry as it is strange, when solidification decreases in volume. This leads to the fact that the packer after installation, most likely, will lose sealing contact.

In prior art fluid inflatable packers are described in particular in patents US 4897139, US 4967846 and US 5271469. Inflatable packer inflate the cement described in patent US 5738171.

The present invention aims at eliminating the disadvantages of prior devices of the expansion element and ensuring tightness after the expansion. The extension element, as before, by using the liquid. However, the layer is placed in the annular space between the element and the packer, when the con is the act extends the liquid absorbs the expanding fluid and expands, so the increased volume of liquid and the expanding layer in the preferred embodiment, is equal to the volume of the two layers prior to the acquisition. The achieved advantage is the preservation of integrity, despite the damage to the item because of the expanding layer is held therein by the fluid provides a persistent efforts, ensuring tightness. Moreover, there is no reduction of volume after expansion, as was the case in known devices which use cement mortar that could reduce sealing (sealing) the force of the inflated element. These and other advantages of the present invention will become specialist in this field more apparent from the description of the preferred variant implementation of the invention, the drawings and claims that follow.

In accordance with the foregoing, the present invention features an inflatable (expandable) packer, characterized by the presence of a layer of swellable material placed in the annular space between the packer and seal (inflatable) element, installed on top of the packer. Swelling material can be performed together with sealing element or bonded with him, or it may be adjacent, in other words, to be secured to the packer. When inflating medium, and the hour of the particular fluid, supplied between the swellable material and the sealing element in the annular gap, the specified element expands and comes into tight contact with the surrounding pipe or wellbore. The liquid is captured through acquisitions or otherwise interacts with swelling material, so that in the preferred embodiment, the total volume occupied swelling material and liquid withheld swelling material after mixing, is stored in such a way that preserves the integrity of the sealing element, even if you have problems with by the sealing element.

Below the invention is illustrated by the example of its implementation with reference to the accompanying drawings, on which:

figure 1 presents a section of the inflatable packer in the transport position with the swelling layer associated with the item;

figure 2 presents in the transport position, option, alternative execution figure 1, with swelling layer that is separate from the element.

figure 3 presents the view from figure 2 in the working position; and

4 shows the view from figure 3, showing the activation of the liquid absorbed in the swellable material.

Figure 1 schematically shows an inflatable packer in the cut. It is known to the node 12, the input valve on the fixed sleeve 14 that is associated with the article is I 16 packer. With the inner surface 20 of the inflatable (o) element 18 is connected swelling layer 22 swellable material. At the bottom end of the element 18 is shown schematically lower sleeve 24. Expanding the fluid, shown schematically by the arrow 26, is pumped through the inlet 28. As shown in figure 1, the swelling layer has an initial volume V1. Through the entrance 28 is pumped volume V2, also shown schematically in figure 1. This volume of liquid is absorbed in the volume V1 swelling layer. In a preferred embodiment of the invention the swelling layer swells as it absorbs them at least part of the volume V2 of the liquid. In a preferred embodiment, the destination volume V3, shown in figure 4, is equal to, and preferably greater than the sum of V1 and V2 before mixing extender fluid, indicated by arrow 26, with swelling layer 22. In the embodiment shown in figure 1, extends fluid 26, after she was admitted through the valve Assembly, first comes into contact with the inner edge 30 facing the barrel 16 of the packer.

Figure 2 swelling layer 22' is a layer that is separate from the element 18'. Swelling layer 22' may be bonded with the barrel 16' of the packer or freely placed on top of it. Swelling layer in both versions of the invention may be a seamless tube, or it may have different healthy lifestyles the config seam. Alternatively, the swelling layer can be in the form of a spiral with overlapping edges. It can also be made as separate pieces that are connected or in contact with each other. Figure 1 is a swelling layer 22 may be performed together with the element 18 or can be a separate layer, glued or otherwise connected to it.

Figure 3 shows the fluid 26'coming between the element 18' and the swelling layer 22'. Here again, the final volume V3' must be at least equal to the initial volume V1' of the liquid and the volume V2' swelling layer 22 before swelling.

In preferred versions of the swelling layer 22 or 22' may be made of a triple-propylene rubber (diene co monomer) or from other materials such as natural rubber or bromobutyl rubber. These materials when exposed to hydrocarbons serving as expanding fluid will swell, keeping the liquid and fulfilling the requirements for the volume above. In the inflatable element will maintain tightness after the expansion. The process of swelling, passing in a long time, in fact ensuring tightness increases the force by increasing the excess V3 over the sum of V1 and V2. In addition, if the elements 18 or 18' is formed to flow or bit is in, effort, ensuring tightness, will be maintained as expanding fluid will be linked in the swollen layer 22 or 22', and in the preferred embodiment of the swollen layer will be sufficiently strong to retain the damaged item in tight contact with the wellbore.

Other embodiments of the swelling layer 22 or 22' include use as an extender liquid clay, such as bentonite clay, which is greatly expanded in the presence of water and then hardens. As a consequence of the fact that such material meets the requirements for volumetric criteria, it can be used in inflatable packers. Hardened clay can also be used to keep expanding the liquid and can be strong enough to contribute to the preservation of integrity in the presence of damage to the element 18 or 18'. Alternatively, the swelling layer 22 or 22' may contain fabric of a fluid-absorbing and significantly expanding. Perhaps a combination of fabric and clay, such as bentonite clay, in addition to the use of synthetic rubber or other material that is swellable in the presence of oil.

As expanding environment can be used drilling muds based on a mixture of oil and water. Typical drilling fluid may be composed of 60% oil and 40% water with an Addendum is receiving solid filler to increase the density. If expanding the liquid is a mixture of oil and water, then clay, such as bentonite clay or tissue can swell upon contact with water, and synthetic rubber or rubber may swell when interacting with oil.

For the person skilled in the art it is clear that the reliability of inflatable packers increases in the use of swellable material linking the expanding fluid, and they are not vulnerable to the loss of useful volume. On the contrary, the swelling improves sealing contact and contributes to maintaining such contact even with the change in the temperature conditions in the well or if the damage element. Can be used in different configurations of the sealing element and the swelling layer. Although the preferred material may be used synthetic rubber, can be used swelling and other materials exposed to other liquids.

In alternative embodiments, may also be used materials, swelling under the influence of heat, current, fields of different type or the different types of reactions. The material or combination of materials may be used in cases when the requirements and scope of the formed layer is strong enough to maintain sealing force, despite the damage upl is titeling element. Ideal to extend the environment, whether it is liquid or gas, would resist swelling layer, despite the damage to the element.

The above description illustrates the preferred embodiment of the invention, and a person skilled in the art can be made of numerous modifications without departing from the scope of the invention, which should accurately and equivalent to be determined by the following claims.

1. Packer, containing the packer sealing element mounted on top of the packer to form with it an annular gap, the material placed in the annular gap with the ability to capture at least part of the medium supplied between the swellable material and the sealing element in the annular gap.

2. Packer according to claim 1, wherein said material has an initial volume V1and fed into the annular gap, the environment has an initial volume V2and due to the filing of volume V2in the annular gap total filed fluid and the specified material at least equal to approximately the sum of the amounts of
V1and V2.

3. Packer according to claim 1, wherein said material retains at least a part of the environment in the event of a malfunction of the sealing element.

4. Packer according to claim 1, wherein said material swells when in contact with the environment.

5. Packer according to claim 1, wherein said material swells in the presence of at least water or hydrocarbons.

6. Packer according to claim 3, wherein said material after swelling preserves the integrity of the sealing element, in spite of his failure.

7. Packer according to claim 5, wherein said material swells in the presence of both water and hydrocarbons.

8. Packer according to claim 1, wherein said material is bonded with the sealing element.

9. Packer according to claim 1, wherein said material is bonded with the packer.

10. Packer according to claim 1, wherein said material is free from bonding with the packer or sealing element.

11. Packer according to claim 1, wherein said swellable material is a shape of a tube.

12. Packer according to claim 11, in which the tube is a seamless tube.

13. Packer according to claim 1, wherein said material contains a swelling clay.

14. Packer according to claim 1, wherein said material contains at least one component from the group comprising ternary ethylene-propylene rubber, natural rubber and bromobutyl rubber.

15. Packer according to claim 3, wherein said material has an initial volume V1and fed into the annular gap, the environment has an initial volume V2and due to the filing of volume V2in the annular gap total submitted zhidkosti specified material equal at least about the sum of the amounts of
V1and V2.

16. Packer indicated in paragraph 15, wherein said material swells when in contact with the environment.

17. Packer according to item 16, wherein said material swells in the presence of at least water or hydrocarbons.

18. Packer at 17, wherein said material maintains the tightness of the sealing element, in spite of his failure.

19. Packer on p, wherein said swellable material is a shape of a tube.

20. Packer according to claim 19, wherein said material contains at least one component from the group comprising a swelling clay, ternary ethylene-propylene rubber, natural rubber and bromobutyl rubber.



 

Same patents:

The invention relates to an outer tubular sleeve for equipment of oil wells and similar applications

The intake device // 2119017

The intake device // 2119016
The invention relates to devices and mechanisms for exploitation of groundwater sources and intakes, particularly for pumping of artesian water in the main line of urban water systems

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil and gas industry, notably, to inflated packers. It contains a packer mandrel, a packing element and a swelling material. The packing element is assembled over the packer mandrel; there is a circular gap between the packing element and the mandrel. The material is placed in the circular gap and is designed to capture at least part of medium supplied into the circular gap between the swelling material and the packing element.

EFFECT: facilitates maintaining tightness after expanding regardless of damage or change of conditions in well.

20 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes a coupling which can expand in radial direction under influence of fluid medium. Coupling is fixed on end members and includes a pair of cylindrical membranes 20, 21 with flexible and elastic wall coaxially inserted one into the other. Fluid medium pressure influences inner membrane 20. Outer membrane 21 is intended to be pressed to the wall of well or pipeline. Between membranes 20, 21 there is at least one annular and fibre construction 5 of increased density, which is formed by many thin and long fibres with high mechanical strength with diametre of 5 mcm to 100 mcm. Fibres attach end members to each other and are wound in a spiral manner around inner membrane 20. Fibre winding angle in relation to longitudinal symmetry axis X-X' is 45 to 60 in end sections and 15 to 30 in central part of that coupling. Fibre winding density decreases in direction from each end to central section of the coupling wall.

EFFECT: decreasing non-uniform distribution of stresses in fibre construction, and preventing extrusion.

13 cl, 23 dwg

FIELD: oil and gas production.

SUBSTANCE: device consists of tubular collar radially expanding under effect of pumped fluid medium. The collar is rigidly connected with end elements at least one of which contains circular cylinder section facing the collar. The said cylinder section is made on half of thickness of a wall of the element forming two circular flanges. A group of through orifices is formed in the wall of the cylinder section, while material of the collar covers both external and internal sides of the said cylinder section passing through orifices and maintaining its integrity.

EFFECT: reliable connection between collar and end element avoiding unsticking or breaking.

7 cl, 10 dwg

FIELD: packer.

SUBSTANCE: invention belongs to the borehole oilfield equipment and, more specifically, to the expanding packer elements. A plate to be used in the expanding packer possesses a corpus-based element, characterized by the length, width and thickness and containing no less than one bearding in it and at least one wedge, going from it, fittings for interconnection with corpus elements of the adjoining plates of the expanding packer and a range of reinforcing elements, located within the corpus element and formed in a shape of web or twisted structure; moreover the expanding packer contains an elastic bladder and a range of plates, located along the bladder and equipped with reinforcing elements at least partially open in order to provide an easy fixing of the expanding packer against the well shaft walls.

EFFECT: protection against outsqueezing, withstanding mechanical overload, control over the packer elements load rate and enhancement of their characteristics, increases the fixing potential with regard to well shaft walls.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: system for removal of fluid medium from a certain zone of well shaft includes a single packer having external layer expanding in the well shaft across the expansion zone and containing many drain holes in expansion zone and many tubes connected to many drain holes, elastic inflatable balloon located inside external layer and pair of mechanical fastening devices located on opposite ends of external layer and having many turning flow elements connected to many tubes for adaptation to expansion of external layer with elastic inflatable balloon.

EFFECT: improved expansion degrees; higher depression pressure drops; enhanced support of formation in the zone, from which formation fluid media are taken.

Circular web // 2550612

FIELD: oil-and-gas industry.

SUBSTANCE: set of invention relates to circular web systems for expansion in ring-like space between well tubular structure and wellbore inner wall. Circular web comprises tubular section of the well. Expanding coupling covers said tubular section and has inner surface facing said tubular section. Note here that every end of expanding coupling is connected with connecting section connected with tubular section. There is the space between coupling inner surface and tubular section. The element is connected with said coupling. Note here that said element has first and second sections located nearby said inner surface. Note also that element first section is secured to said inner surface. Note that second section extends into said space from first section.

EFFECT: higher hardness of said coupling.

19 cl, 27 dwg

FIELD: oil and gas industry.

SUBSTANCE: device for the borehole sealing includes a well screen unit having the upper end and a segment of an imperforated bearing tube close to the upper end, a withdrawable unit, a mechanical packer and a bypass tool and a swellable packer. The withdrawable unit is placed at the upper end of the imperforated bearing tube. The Bypass tool is placed over the withdrawable unit. The swellable packer is made of a swelling material fixed to the outer side of the imperforated bearing tube and has the first diameter and the second diameter bigger than the first one. The device is made with the potential gravel packing of the well before installation and further removal of the mechanical packer, injection of gravel slurry through the bypass tool to the annular space between the well screen unit and the wellbore wall and sealing of the annular space by the swellable packer. Removal of the mechanical packer and the bypass tool is made by means of the withdrawable unit disconnection.

EFFECT: invention ensures perfection of the device design that does not require additional round trips.

22 cl, 5 dwg

Circular barrier // 2590269

FIELD: pipe.

SUBSTANCE: group of inventions relates to circular barriers, extensible in annular space between tubular structure of well and inner wall of well shaft, as well as a circular barrier systems and systems of well shaft, comprising said circular barrier. Circular barrier comprises tubular element for installation of part of tubular structure of well, expandable cuff made of first metal enclosing tubular element and limiting space communicated with inner cavity of tubular element, expandable collar stretched in longitudinal direction and has an inner surface facing tubular element, and two ends. Circular barrier also includes two connecting elements made from second metal and connecting expandable cuff with a tubular element on each end of extensible collar bore in tubular element to allow passage of fluid in said space for expansion of collar and transition region, containing a compound of collar with connecting element, first metal is more flexible than second metal.

EFFECT: technical result consists in providing higher tightness between collar and tubular element, as well as a mechanical process connection element so that ideally fit to tubular element without change in material of collar and collar to expansion.

20 cl, 9 dwg

FIELD: pipe.

SUBSTANCE: group of inventions relates to annular barriers, well systems and methods for preserving seals. Annular barrier comprises a tubular part for mounting as part of well tubular structure, an expandable sleeve surrounding tubular part, each end of expandable sleeve being fastened to tubular part by means of a connection part, an aperture in tubular part or connection part, and a safety sleeve having a first connection and a second connection for fastening safety sleeve on outer surface of expandable sleeve and an opening in connection with safety sleeve. Safety sleeve and expandable sleeve define a space which is in fluid communication with annulus through opening, wherein safety sleeve has a middle part arranged between two connections, and opening is arranged closer to one of connections than middle part, enabling fluid communication between space and annulus opposite one of connections through opening.

EFFECT: technical result consists in increased sealing capacity of annular barrier.

20 cl, 19 dwg

FIELD: pipes.

SUBSTANCE: group of inventions relates to annular barriers designed for insulation, well systems and related methods for opening annular barriers. Annular barrier includes tubular part, elongated in longitudinal direction for installation as a part of well tubular structure; expanding sleeve surrounding tubular part and confining space connected thus to enable fluid transfer with inner space of tubular part; first passage for fluid designed for fluid inlet in the space for coupling opening; and connecting module containing connecting part connected to slide with tubular part, wherein the first end of expanding sleeve is connected with connecting part; fixed part rigidly connected with tubular part; and drive mechanism to apply axial force to the first end of expanding sleeve, as a result, the connecting part is displaced in lengthwise direction towards the second end of expanding coupling connected with tubular part; drive mechanism additionally comprises pressure chamber formed by at least partially between the surface of connecting part and surface of fixed part, and the second passage for fluid medium designed for fluid inlet into pressure chamber to provide connecting part puhing in longitudinal direction; in coupling part there is the first fluid passage connecting with the possibility of fluid transfer space limited by expanding coupling and pressure chamber.

EFFECT: technical result consists in preventing undesired thinning of expanding coupling.

17 cl, 13 dwg

Up!