Oil field underground packer

Abstract

The utility model relates to an oil field underground packer, which belongs to the technical field of plugging equipment and comprises an upper joint, a central pipe and a lower joint, a rubber sleeve is sleeved on the outer side of the central pipe and comprises an outer sleeve, a high-strength fiber reinforced layer and an inner sleeve, and the inner sleeve comprises an oil absorption expansion rubber inner sleeve and a water absorption expansion rubber inner sleeve; liquid through holes II are formed in the upper joint and the lower joint; liquid through holes I communicated with the outer wall of the rubber barrel are uniformly formed in the outer barrel; annular distribution grooves are formed in the outer walls of the two ends of the center pipe, and liquid guide grooves are evenly formed in the outer side wall of the center pipe. The self-expansion packer can adapt to the complex underground environment with oil-water mixing, self-expansion sealing can be achieved no matter the packer encounters oil or water, the oil absorption expansion rubber inner barrel and the water absorption expansion rubber inner barrel can make contact with the liquid rapidly and evenly inside and outside and expand, the working efficiency of the packer is improved, and the safety of the packer is guaranteed. And the high-strength fiber reinforced layer is arranged between the outer cylinder and the inner cylinder, so that the overall strength and the tensile property are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oilfield downhole packer and belongs to the technical field of plugging equipment. BACKGROUND

[0002] In the oilfield exploitation process, the packer is an important tool for sealing different areas such as downhole oil layers and water layers. The self-expanding packer is widely used in special occasions because the rubber sleeve is made of oil or water swelling rubber. The existing packer has deficiencies in sealing performance and expansion adaptability under some complex working conditions. For example, it cannot well adapt to the downhole environment of oil-water mixing, it is difficult to achieve rapid and uniform expansion, and the overall strength and tensile resistance are poor. SUMMARY

[0003] The utility model provides an oilfield downhole packer, solves the problem that the current packer cannot well adapt to the downhole environment of oil-water mixing, it is difficult to achieve rapid and uniform expansion, and the overall strength and tensile resistance are poor.

[0004] The utility model relates to an oilfield downhole packer, including upper joint, center tube, lower joint, center tube both ends are connected with upper joint and lower joint respectively, the outside of center tube is equipped with rubber sleeve, rubber sleeve includes the outer tube of ordinary rubber of outermost layer, high strength fiber reinforced layer and inner tube, inner tube includes oil swelling rubber inner tube and water swelling rubber inner tube, upper joint and lower joint all are equipped with liquid passage no.

[0005] As a preferred, the outer surface of the center tube is uniformly provided with anti-peristalsis protrusions. The friction between the rubber sleeve and the center tube can be increased, and the peristalsis of the rubber sleeve on the center tube can be effectively prevented, thereby ensuring the stability of the packer.

[0006] As a preferred, the two ends of the outer tube are provided with split bosses that wrap the end portions of the inner tube therein, and the inner hole wall of the split boss is in contact with the outer wall of the center tube. The end portions of the inner tube can be prevented from directly contacting the upper joint and the lower joint, thereby preventing damage to the inner tube during expansion.

[0007] As a preferred, the outer side of the liquid guide groove is provided with a separation net, the top of the separation net is arc-shaped, and the outer side wall of the separation net is flush with the outer side wall of the center tube. The separation net can prevent the inner tube from entering the liquid guide groove and causing blockage.

[0008] As a preferred, the center tube is provided with a sealing ring at the connection with the upper joint and the lower joint, and the sealing ring is located on the outer side of the liquid passage no.

[0009] As a kind of preferred, the upper joint and lower joint are provided with annular positioning groove, and the outer side wall of the split boss is provided with positioning boss matched with the positioning groove.Outside cylinder can be better positioned.

[0010] As a kind of preferred, the inner hole of the two ends of outer cylinder is provided with stepped variable-diameter shrinkage hole, and the outer end of oil-absorbing expansion rubber inner cylinder and water-absorbing expansion rubber inner cylinder is provided with matching variable-diameter platform matched with the variable-diameter shrinkage hole, so that the matching of outer cylinder and inner cylinder can be better facilitated.

[0011] The utility model has the following beneficial effects:

[0012] By setting the oil-absorbing expansion rubber inner cylinder and the water-absorbing expansion rubber inner cylinder, the packer can adapt to the complex downhole environment of oil-water mixture, and can realize self-expansion sealing whether encountering oil or water, including liquid hole one, liquid hole two and liquid guide groove, so that the oil-absorbing expansion rubber inner cylinder and the water-absorbing expansion rubber inner cylinder can quickly and uniformly contact liquid and expand, the working efficiency of the packer is improved, and the high-strength fiber reinforced layer is arranged between the outer cylinder and the inner cylinder, so that the overall strength and tensile resistance are improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description.Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be obtained according to the provided drawings without creating labor.

[0014] The structure, proportion, size and the like disclosed in the specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions that the utility model can be implemented, so it does not have the substantial meaning of technology, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the utility model can produce, should still fall within the range that the technical content disclosed by the utility model can cover.

[0015] Figure 1 It is the front view structural schematic diagram of the utility model;

[0016] Figure 2 It is Figure 1 Partial structural schematic diagram;

[0017] Figure 3 It is the side sectional view structural schematic diagram of the center tube;

[0018] In the diagram: 1. Upper connector; 2. Central tube; 3. Fluid passage hole one; 4. High-strength fiber reinforced layer; 5. Oil-absorbing and expanding rubber inner cylinder; 6. Fluid guiding groove; 7. Outer cylinder; 8. Water-absorbing and expanding rubber inner cylinder; 9. Dividing boss; 10. Positioning boss; 11. Lower connector; 12. Sealing ring; 13. Fluid passage hole two; 14. Annular distribution groove; 15. Matching variable diameter platform; 16. Partition mesh; 17. Anti-creep protrusion. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1, as Figures 1 to 3 As shown, this utility model is an oilfield downhole packer, including an upper connector 1, a central tube 2, and a lower connector 11. The two ends of the central tube 2 are connected to the upper connector 1 and the lower connector 11, respectively. A rubber sleeve is sleeved on the outside of the central tube 2. The rubber sleeve includes an outer cylinder 7 made of ordinary rubber, a high-strength fiber reinforced layer 4, and an inner cylinder. The inner cylinder includes an oil-absorbing and expanding rubber inner cylinder 5 and a water-absorbing and expanding rubber inner cylinder 8. Both the upper connector 1 and the lower connector 11 are provided with a second fluid passage hole 13. The outer cylinder 7 is uniformly provided with a first fluid passage hole 3 communicating with the outer wall of the rubber sleeve. The outer walls at both ends of the central tube 2 are provided with annularly distributed grooves 14 communicating with the second fluid passage hole 13. The outer walls of the central tube 2 are uniformly provided with fluid guiding grooves 6 communicating with the annularly distributed grooves 14 on both sides.

[0021] During installation, the high-strength fiber-reinforced layer 4 is fitted over the outer sides of the oil-absorbing and expanding rubber inner cylinder 5 and the water-absorbing and expanding rubber inner cylinder 8. Then, an outer cylinder 7 is fabricated outside the high-strength fiber-reinforced layer 4, forming an integral rubber cylinder structure. The rubber cylinder is fitted onto the central tube 2, and the upper connector 1 and lower connector 11 are installed at both ends of the central tube 2 via threaded connections, ensuring a secure connection. The packer is lowered into the well. Once the packer reaches its designated position, downhole oil or water will enter the inner and outer surfaces of the oil-absorbing and expanding rubber inner cylinder 5 and the water-absorbing and expanding rubber inner cylinder 8 through the fluid passage hole 3 on the outer cylinder 7 and the fluid passage hole 13 on the upper and lower connectors 1 and 11. The oil will contact the oil-absorbing and expanding rubber inner cylinder 5, causing it to expand, and the water will contact the water-absorbing and expanding rubber inner cylinder 8, causing it to expand. The two inner cylinders expand relatively evenly, thus achieving isolation of the corresponding downhole area.

[0022] In the second embodiment, the outer surface of the central tube 2 is evenly provided with anti-peristalsis protrusions 17. During the sealing process, the anti-peristalsis protrusions 17 prevent the rubber sleeve from peristalsis on the central tube 2, and the positioning structure ensures the stability of the position of the rubber sleeve.

[0023] The outer cylinder 7 is provided with split bosses 9 at both ends, which wrap the end of the inner cylinder. The inner hole wall of the split boss 9 is in contact with the outer wall of the central tube 2. The high-strength fiber reinforced layer 4 is made of aramid fiber or carbon fiber and is tightly woven in a weft and warp interlaced manner. Its function is to enhance the overall strength and tensile properties of the rubber sleeve, effectively prevent the inner cylinder from excessive deformation and tearing under high pressure, and at the same time improve the wear resistance of the outer cylinder 7.

[0024] The outer side of the liquid guide groove 6 is provided with a separation net 16, the top of the separation net 16 is arc-shaped, and the outer side wall of the separation net 16 is flush with the outer side wall of the central tube 2.

[0025] The central tube 2 is provided with a sealing ring 12 at the connection position of the upper joint 1 and the lower joint 11, and the sealing ring 12 is located outside the liquid passage two 13. The sealing ring 12 ensures the sealing of the connection position and ensures the reliable work of the packer.

[0026] The upper joint 1 and the lower joint 11 are provided with annular positioning grooves, and the outer side wall of the split boss 9 is provided with positioning bosses 10 matched with the positioning grooves. The positioning bosses 10 are machined on the upper joint 1 and the lower joint 11, the annular distribution grooves 14, the liquid guide grooves 6 and the anti-peristalsis protrusions 17 are machined on the central tube 2, and the sealing grooves for installing the sealing ring 12 are reserved at the connection position of the upper joint 1, the lower joint 11 and the central tube 2. When the upper joint 1 and the lower joint 11 are connected, the split boss 9 is aligned with the positioning groove, and positioning installation can be performed.

[0027] The inner hole of the outer cylinder 7 at both ends is provided with a stepped variable-diameter contraction hole, and the outer end of the oil-swelling rubber inner cylinder 5 and the water-swelling rubber inner cylinder 8 is provided with a matching variable-diameter table 15 matched with the variable-diameter contraction hole.

[0028] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

[0029] In the description of the present application, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

Claims

1. An oilfield downhole packer, comprising an upper joint (1), a central pipe (2), a lower joint (11), the central pipe (2) being connected with the upper joint (1) and the lower joint (11) at both ends respectively, and a rubber sleeve being sleeved outside the central pipe (2), characterized in that: The rubber tube comprises an outer tube (7) made of common rubber, a high-strength fiber reinforced layer (4) and an inner tube, the inner tube comprises an oil-absorbing and swelling rubber inner tube (5) and a water-absorbing and swelling rubber inner tube (8); the upper joint (1) and the lower joint (11) are each provided with a liquid passage hole two (13), the outer tube (7) is uniformly provided with a liquid passage hole one (3) communicating with the outer wall of the rubber tube; the outer wall of the two ends of the center tube (2) is provided with an annular distribution groove (14) communicating with the liquid passage hole two (13), and the outer wall of the center tube (2) is uniformly provided with a liquid guide groove (6) communicating with the two annular distribution grooves (14).

2. An oilfield downhole packer as defined in claim 1, wherein: The outer surface of the center tube (2) is uniformly provided with an anti-peristalsis protrusion (17).

3. The downhole packer of claim 1, wherein: The two ends of the outer tube (7) are provided with split bosses (9) for wrapping the end portions of the inner tube, and the inner hole wall of the split boss (9) is in contact with the outer wall of the center tube (2).

4. The downhole packer of claim 1, wherein: The outer side of the liquid guide groove (6) is provided with a screen (16), the top of the screen (16) is arc-shaped, and the outer wall of the screen (16) is flush with the outer wall of the center tube (2).

5. The downhole packer of claim 1, wherein: The center tube (2) is provided with a sealing ring (12) at the connection with the upper joint (1) and the lower joint (11), and the sealing ring (12) is located on the outer side of the liquid passage hole two (13).

6. An oilfield downhole packer as defined in claim 3, wherein: The upper joint (1) and the lower joint (11) are provided with an annular positioning groove, and the outer wall of the split boss (9) is provided with a positioning boss (10) matched with the positioning groove.

7. The downhole packer of claim 1, wherein: The inner hole of the two ends of the outer tube (7) is provided with a stepped variable-diameter contraction hole, and the outer end of the oil-absorbing and swelling rubber inner tube (5) and the water-absorbing and swelling rubber inner tube (8) is provided with a matching variable-diameter table (15) matched with the variable-diameter contraction hole.

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