Novel SCR-SV easy-to-drill squeeze bridge plug

Abstract

The utility model relates to a novel SCR-SV easy-to-drill squeezing bridge plug which comprises a release ring. A central tube; a slip; the release ring, the central pipe, the slip and the cone are connected in sequence; the sealing mechanism is detachably connected with the cone, the sealing mechanism comprises an outer back ring, an inner back ring, a middle rubber sleeve and two side rubber sleeves, the middle rubber sleeve and the side rubber sleeves are arranged on the outer wall of the central pipe in a sleeving mode, the two side rubber sleeves are arranged on the two sides of the middle rubber sleeve respectively and used for wrapping and extruding the middle rubber sleeve, and the middle rubber sleeve is sleeved with the inner back ring. The outer back ring and the inner back ring are both arranged on the outer wall of the center pipe in a sleeving mode and used for extruding the side rubber barrels. The connection relation and combination of the middle rubber cylinder and the two side rubber cylinders enable the sealing performance to be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools, in particular to a novel SCR-SV easy-drilling and squeezing bridge plug. Background Art

[0002] During the exploration and development of oil and gas fields, it is necessary to inject cement to seal the formation, so squeezed bridge plugs are needed. With the continuous increase in the vertical depth of oil field drilling, the underground cement squeeze operation environment tends to be higher temperature and higher pressure. Conventional cast iron squeezed bridge plugs are prone to problems such as bridge plug body cracking and poor sealing in such a high temperature and high pressure environment, which poses certain operational risks.

[0003] Therefore, it is necessary to develop a new type of easy-to-drill and squeeze-inject bridge plug that can adapt to high temperature and high pressure environments. The Chinese utility model patent with publication number CN207111040U publicly authorized a new type of drillable bridge plug, which uses a tight spring wrapping protection for the slip into the well, which can solve the problem of slip falling into the well, but the rubber cylinder is arranged horizontally, and there is a lack of protection for the middle sealing rubber cylinder during the well running. It is easy to swell at high temperature during the running process, and there is no anti-rotation measure, which is easy to cause mutual wear between the rubber cylinder and the back ring, and between the back ring and the cone, and finally leads to the problem of poor sealing. Utility Model Content

[0004] In view of this, it is necessary to provide a new type of SCR-SV easy-to-drill and squeeze-injection bridge plug to solve the technical problem of poor sealing in the prior art.

[0005] The utility model provides a new type of SCR-SV easy-drilling and squeezing bridge plug, comprising:

[0006] Release ring;

[0007] Central tube;

[0008] Kava;

[0009] The cone, the release ring, the center pipe, the slips and the cone are connected in sequence;

[0010] A sealing mechanism, wherein the sealing mechanism is detachably connected to the cone, and the sealing mechanism comprises an outer back ring, an inner back ring, a middle rubber tube and two side rubber tubes, wherein the middle rubber tube sleeve and the side rubber tube are both sleeved on the outer wall of the center tube, and the two side rubber tubes are respectively arranged on both sides of the middle rubber tube to wrap and squeeze the middle rubber tube, and the outer back ring and the inner back ring are both sleeved on the outer wall of the center tube and used to squeeze the side rubber tubes.

[0011] In an embodiment of the present invention, the cone is located at a side close to the outer back ring, and the cone, the outer back ring, the inner back ring and the side rubber tube are all penetrated by a same pin.

[0012] In one embodiment of the utility model, a first through hole is formed on the inner wall of the center tube away from the release ring, a valve body is sleeved on the inner wall of the center tube away from the release ring, a second through hole is formed on the valve body, and a guide screw is passed between the valve body and the center tube, and the guide screw is used to tighten or shear and make the first through hole and the second through hole either closed or connected.

[0013] In one embodiment of the utility model, a right-angle sealing groove is formed on the outer wall of the central tube, an O-ring is embedded in the right-angle sealing groove, and the guide screw is inserted into the right-angle sealing groove and used to squeeze the O-ring.

[0014] In one embodiment of the utility model, it also includes an upper cava protection sleeve, which is sleeved on the outer wall of the central tube on one side close to the release ring. A cava installation groove is also provided on the side of the upper cava protection sleeve away from the release ring, and the cava installation groove is used to limit the radial flipping of the cava.

[0015] In one embodiment of the utility model, a hoop is further included, and the hoop is sleeved on the outer wall of the slip and used to prevent the slip from falling off.

[0016] In an embodiment of the present invention, the axial length of the middle rubber tube is greater than the axial length of the side rubber tube.

[0017] In one embodiment of the utility model, a guide shoe is further included. The guide shoe is arranged on a side of the central pipe away from the release ring and is used to provide a cement squeezing channel.

[0018] In an embodiment of the present invention, the length of the side rubber tube wrapping the middle rubber tube is at least two thirds of the length of the middle rubber tube.

[0019] In an embodiment of the utility model, one side of the central tube is sleeved with the release ring, the slip is detachably connected to the outer wall of the central tube, and the cone is detachably connected to the outer wall of the central tube.

[0020] Compared with the prior art, the new SCR-SV easy-to-drill and squeeze-injection bridge plug provided by the utility model has the following beneficial effects:

[0021] In the utility model, a sealing structure is constructed by arranging an outer back ring, an inner back ring, a middle rubber tube and two side rubber tubes; further, the two side rubber tubes are arranged on both sides of the middle rubber tube to wrap and squeeze the middle rubber tube, and the sealing performance is greatly improved by constructing a three-rubber tube and extrusion seal; in particular, the side rubber tubes protect the middle rubber tube, effectively enhance the service life of the middle rubber tube, and indirectly enhance the sealing performance.

[0022] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the preferred embodiment of the utility model is described in detail as follows with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1 An isometric diagram of a new type of SCR-SV easy-drilling and squeezing bridge plug provided by the utility model;

[0025] Figure 2 for Figure 1 Left view of

[0026] Figure 3 for Figure 2 A cross-sectional view of the internal structure;

[0027] Figure 4 for Figure 3 A magnified schematic diagram of center A.

[0028] The reference numerals are as follows:

[0029] 100, release ring; 200, center tube; 210, first through hole; 220, right-angle sealing groove; 230, O-ring; 300, slip; 400, cone; 500, sealing mechanism; 510, outer back ring; 520, inner back ring; 530, middle rubber tube; 540, side rubber tube; 550, pin; 600, valve body; 610, second through hole; 620, guide screw; 700, upper slip protective sleeve; 710, slip installation groove; 800, hoop; 900, guide shoe. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] See also Figure 1-Figure 4The utility model provides a novel SCR-SV easy-to-drill and squeeze-injection bridge plug, comprising a release ring 100; a center pipe 200; a slip 300; a cone 400, wherein the release ring 100, the center pipe 200, the slip 300 and the cone 400 are connected in sequence; a sealing mechanism 500, wherein the sealing mechanism 500 is detachably connected to the cone 400, and the sealing mechanism 500 comprises an outer back ring 510, an inner back ring 520, a middle rubber tube 530 and two side rubber tubes 540, wherein the middle rubber tube 530 and the side rubber tubes 540 are both sleeved on the outer wall of the center pipe 200, and the two side rubber tubes 540 are respectively arranged on both sides of the middle rubber tube 530 to wrap and squeeze the middle rubber tube 530, and the outer back ring 510 and the inner back ring 520 are both sleeved on the outer wall of the center pipe 200 and used to squeeze the side rubber tubes 540.

[0032] When in use, the release ring 100 is first used to squeeze the cone 400 by the cava 300, and the cone 400 sequentially squeezes the outer back ring 510 and the inner back ring 520, and the two side rubber tubes 540 squeeze the middle rubber tube 530, so that the sealing of the middle rubber tube 530 section is greatly improved; in addition, since the side rubber tubes 540 form a wrapping protection for the middle rubber tube 530, the downhole erosion is reduced, and the service life and sealing of the middle rubber tube 530 are effectively improved.

[0033] Furthermore, in one embodiment of the utility model, the cone 400 is located on a side close to the outer back ring 510, and the cone 400, the outer back ring 510, the inner back ring 520 and the side rubber tube 540 are all penetrated by the same pin 550, so that the cone 400, the outer back ring 510, the inner back ring 520 and the side rubber tube 540 can be formed into one body, reducing the possibility of mutual rotation and making entry into the well more stable.

[0034] Furthermore, in one embodiment of the utility model, a first through hole 210 is provided on the inner wall of the central tube 200 away from the release ring 100, a valve body 600 is sleeved on the inner wall of the central tube 200 away from the release ring 100, a second through hole 610 is provided on the valve body 600, a guide screw 620 is passed between the valve body 600 and the central tube 200, and the guide screw 620 is used to tighten or shear and close or connect the first through hole 210 and the second through hole 610. Specifically, with the shearing of the guide screw 620 and the movement of the valve body 600, the first through hole 210 is connected with the second through hole 610 and an extrusion channel is formed.

[0035] Furthermore, in one embodiment of the utility model, a right-angle sealing groove 220 is opened on the outer wall of the center tube 200, an O-ring 230 is embedded in the right-angle sealing groove 220, and a guide screw 620 is inserted into the right-angle sealing groove 220 and used to extrude the O-ring 230. In this way, a more rigorous sealing structure can be constructed through the combined structure of the O-ring 230 and the right-angle sealing groove 220, thereby improving the extrusion sealing effect.

[0036] Furthermore, in one embodiment of the utility model, an upper slip protection sleeve 700 is further included. The upper slip protection sleeve 700 is sleeved on the outer wall of the central pipe 200 close to the release ring 100. A slip installation groove 710 is further provided on the side of the upper slip protection sleeve 700 away from the release ring 100. The slip installation groove 710 is used to limit the radial flipping of the slip 300. Specifically, the slip installation groove 710 is used to limit the radial flipping of the slip 300.

[0037] Furthermore, in one embodiment of the utility model, a hoop 800 is further included. The hoop 800 is sleeved on the outer wall of the slip 300 and is used to prevent the slip 300 from falling off.

[0038] Furthermore, in an embodiment of the present invention, the axial length of the middle rubber tube 530 is greater than the axial length of the side rubber tube 540 , so that the side rubber tube 540 can wrap and cover most of the middle rubber tube 530 .

[0039] Furthermore, in one embodiment of the present invention, a guide shoe 900 is further included. The guide shoe 900 is sleeved on a side of the central pipe 200 away from the release ring 100 and is used to provide a cement squeezing channel.

[0040] Furthermore, in an embodiment of the present invention, the length of the side rubber tube 540 wrapped around the middle rubber tube 530 is at least two thirds of the length of the middle rubber tube 530 .

[0041] Furthermore, in one embodiment of the utility model, one side of the center tube 200 is sleeved with the release ring 100, the slips 300 are detachably connected to the outer wall of the center tube 200, and the cone 400 is detachably connected to the outer wall of the center tube 200.

[0042] The main mechanical structure of the new SCR-SV easy-to-drill and squeeze bridge plug is consistent with that of a conventional bridge plug. Conventional shear pins, other sealing rings, locking rings and other parts are not described in detail. They can be understood by referring to the mechanical structure and working principle of a conventional bridge plug.

[0043] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A new type of SCR-SV easy-drilling squeeze injection bridge plug, characterized in that: include: Release ring; Central tube; Kava; The cone, the release ring, the center pipe, the slips and the cone are connected in sequence; A sealing mechanism, wherein the sealing mechanism is detachably connected to the cone, and the sealing mechanism comprises an outer back ring, an inner back ring, a middle rubber tube and two side rubber tubes, wherein the middle rubber tube sleeve and the side rubber tube are both sleeved on the outer wall of the center tube, and the two side rubber tubes are respectively arranged on both sides of the middle rubber tube to wrap and squeeze the middle rubber tube, and the outer back ring and the inner back ring are both sleeved on the outer wall of the center tube and used to squeeze the side rubber tubes.

2. A new type of SCR-SV easy-drilling and squeezing bridge plug according to claim 1, characterized in that: The cone is located at a side close to the outer back ring, and the cone, the outer back ring, the inner back ring and the side rubber tube are all penetrated by a same pin.

3. The novel SCR-SV easy-to-drill and squeeze-injection bridge plug according to claim 1 is characterized in that: A first through hole is provided on the inner wall of the center tube away from the release ring, a valve body is sleeved on the inner wall of the center tube away from the release ring, a second through hole is provided on the valve body, a guide screw is passed between the valve body and the center tube, and the guide screw is used for tightening or shearing and making the first through hole and the second through hole either closed or connected.

4. A new type of SCR-SV easy-drilling and squeezing bridge plug according to claim 3, characterized in that: A right-angle sealing groove is formed on the outer wall of the central tube, an O-ring is embedded in the right-angle sealing groove, and the guide screw is inserted into the right-angle sealing groove and is used to squeeze the O-ring.

5. The novel SCR-SV easy-to-drill and squeeze-injection bridge plug according to claim 1 is characterized in that: It also includes an upper slip protection sleeve, which is sleeved on the outer wall of the central tube close to the release ring. A slip installation groove is also provided on the side of the upper slip protection sleeve away from the release ring, and the slip installation groove is used to limit the radial flipping of the slip.

6. The novel SCR-SV easy-to-drill and squeeze-injection bridge plug according to claim 1 is characterized in that: It also includes a hoop, which is sleeved on the outer wall of the slip and is used to prevent the slip from falling off.

7. The novel SCR-SV easy-drilling and squeezing bridge plug according to claim 1 is characterized in that: The axial length of the middle rubber cylinder is greater than the axial length of the side rubber cylinder.

8. The novel SCR-SV easy-to-drill and squeeze-injection bridge plug according to claim 1 is characterized in that: It also includes a guide shoe, which is arranged on a side of the central pipe away from the release ring and is used to provide a cement squeezing channel.

9. The novel SCR-SV easy-to-drill and squeeze-injection bridge plug according to claim 1 is characterized in that: The length of the side rubber tube wrapping the middle rubber tube is at least two thirds of the length of the middle rubber tube.

10. The novel SCR-SV easy-to-drill and squeeze-injection bridge plug according to claim 1 is characterized in that: One side of the center tube is sleeved with the release ring, the slip is detachably connected to the outer wall of the center tube, and the cone is detachably connected to the outer wall of the center tube.

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