Cement retainer

Abstract

The utility model belongs to the technical field of petrochemical equipment, and particularly relates to a cement retainer. The utility model provides a cement retaining device capable of simplifying the construction process. The packer comprises an upper joint, and is characterized in that the lower end of the upper joint is fixedly connected with the upper end of a central tube, a floral tube is fixedly arranged outside the lower end of the central tube, a ball seat connected with the upper part of the floral tube through a setting shear pin is arranged in the lower end of the central tube, a setting ball is arranged in the ball seat, and a containing groove of the ball seat is formed in the lower part in the floral tube; a first through hole communicated with the accommodating groove is formed in the surface of the floral tube; the lower end of the tension bar is fixedly connected with the lower back cap through a releasing shear pin; a cylinder barrel is arranged outside the central pipe, a cavity is arranged between the central pipe and the cylinder barrel, a piston is arranged at the upper end in the cavity, and the central pipe is communicated with the cavity above the piston; a push sleeve is fixedly arranged at the lower end of the piston, and a second through hole corresponding to the first through hole is formed in the push sleeve.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of petrochemical equipment, and particularly relates to a cement retainer. BACKGROUND

[0002] With the development of oil fields, in the process of oil testing, well completion and well repair, pipe outside groove stringing is often encountered, if the cementing section leakage is not solved in time, high-pressure water layer near the oil layer will enter the oil layer, causing the water content to rise and the oil layer to be watered out, which brings problems to oilfield production, so it is necessary to plug the string groove, and cement squeezing operation is also needed for abandoned wells.

[0003] For this situation, the conventional construction method cannot avoid the use of cement retainers, and the role of the cement retainer is to first protect the oil layer and perform cement squeezing operation on the water layer above the oil layer. After the cement solidifies for a certain period of time, the cement plug is drilled, and then production is resumed.

[0004] The existing cement retainers, whether retrievable or fast-drilling, are not very efficient, and the influencing factors are summarized as follows:

[0005] The retrievable retainer operation process needs to send a pipe sealing column, set a seal and drop a hand, lift the pipe column, fill sand, squeeze cement, drill a plug, and flush sand and salvage.

[0006] The fast-drilling retainer operation process needs to send a pipe sealing column, set a seal and drop a hand, lift the set sealing pipe column, squeeze cement, drill a plug, and flush debris, and cement combined with rubber tube debris is not easy to flush. SUMMARY

[0007] The utility model is aimed at the above problems, and provides a cement retainer which can simplify the construction process.

[0008] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme, the utility model discloses upper joint, its characterized in that: upper joint lower end is fixedly connected with the upper end of central tube, the outer fixed of central tube lower end is provided with flower pipe, the inner of central tube lower end is provided with ball seat that is connected with the upper portion of flower pipe through seat seal shear pin, ball seat is provided with seat seal ball in, the lower portion of flower pipe is provided with the accommodating groove of ball seat in, the surface of flower pipe is provided with the first through -hole that communicates with the accommodating groove, flower pipe lower end is fixedly connected with the tension rod, and the tension rod lower end is fixedly connected with lower back cap through the drop hand shear pin, the outer of central tube is provided with cylinder, and the cavity between central tube and cylinder is provided with, and the upper end of cavity is provided with piston in, and the cavity of central tube and piston top communicates, the lower end of piston is fixedly provided with push sleeve, and the second through -hole that corresponds with the first through -hole is set up on push sleeve, the lower end of push sleeve is fixedly provided with lower centralizing sleeve, and the lower end surface of centralizing sleeve upper end surface corresponds with the cylinder sleeve, the taper and slip between lower back cap and lower centralizing sleeve are provided with, and the inner taper groove of slip is matched with the outer surface of taper, the ring groove between tension rod and the inside of taper is provided with built-in ball, and the neck of taper is provided with the built-in ball cooperation in the central hole that the tension rod passes through.

[0009] As a preferred scheme of the utility model, the taper, the sealing sleeve and the slip are made of soluble material.

[0010] Further, the surface of the taper, the sealing sleeve and the slip is provided with wear-resistant and corrosion-resistant coating.

[0011] As a preferred scheme of the utility model, the taper is further provided with the sealing sleeve outside, and the lower surface of the sealing sleeve corresponds with the slip.

[0012] Further, the surface of the sealing sleeve is provided with sealing ring through sealing groove.

[0013] As another preferred scheme of the utility model, the upper joint is rotatably provided with upper centralizing sleeve outside, and the upper centralizing sleeve and the lower centralizing sleeve are provided with liquid passing groove outside.

[0014] Further, the outer diameter of the upper centralizing sleeve and the lower centralizing sleeve is greater than the maximum outer diameter of the taper, the sealing sleeve and the slip.

[0015] The utility model has the advantages that the taper, the sealing sleeve and the slip are made of soluble material, and the utility model is not sealed by rubber cylinder, after the pipe string is in place, the well can be washed circularly, after the well washing is finished, the ball is thrown to seal, after sealing, the pipe string is directly squeezed for cementing operation without lifting and sending, after 24h waiting for condensation, the pipe string is lifted and sent, the lower three scrapers drill the cement plug and the carrier in the pipe string, the carrier is not provided with rubber cylinder, and the drilling is easy, the ball seat is arranged in the central tube, once the central passage is communicated, the soluble carrier is accelerated to dissolve, the safety of construction operation is greatly reduced, the pipe string and the plug drilling period are saved, and the operation is simple, safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of the utility model.

[0017] Figure 2 It is Figure 1 The partial enlarged view of

[0018] In the drawing, 1 is an upper joint, 2 is an upper centralizing sleeve, 3 is a central pipe, 4 is a piston, 5 is a cylinder barrel, 6 is a push sleeve, 7 is a setting ball, 8 is a ball seat, 9 is a setting shear pin, 10 is a flower pipe, 11 is a lower centralizing sleeve, 12 is an internal ball, 13 is a tension rod, 14 is a sealing sleeve, 15 is a cone, 16 is a slip, 17 is a lower back cap, 18 is a release shear pin, 19 is a cavity, 20 is a first through hole, 21 is a second through hole, 22 is a sealing ring, 23 is a neck, and 24 is a ring groove. Specific implementation

[0019] The utility model discloses an upper joint 1, its characterized in that: upper joint 1 lower extreme and central pipe 3 upper end fixed connection is provided with flower pipe 10 to the outside fixed setting of central pipe 3 lower extreme, is provided with ball seat 8 in the inside setting of central pipe 3 lower extreme and is connected with the upper portion of flower pipe 10 through setting shear pin, is provided with setting ball in ball seat 8, is provided with the accommodating groove of ball seat 8 in the lower portion of flower pipe 10 inside, is provided with the first through hole 20 of communicating with accommodating groove on the surface of flower pipe 10;Flower pipe 10 lower extreme and tension rod 13 fixed connection is fixedly connected through release shear pin 18 with lower back cap 17 between the lower extreme of tension rod 13;It is provided with cylinder barrel 5 to the outside setting of central pipe 3, is provided with cavity 19 between central pipe 3 and cylinder barrel 5, is provided with piston 4 in the upper end of cavity 19 inside, and central pipe 3 communicates with the cavity 19 above piston 4;Piston 4 lower end fixed setting has push sleeve 6, and push sleeve 6 is provided with the second through hole 21 corresponding with the first through hole 20, push sleeve 6 lower end fixed setting has lower centralizing sleeve 11, and lower centralizing sleeve 11 upper end surface corresponds with cylinder sleeve lower end surface;It is provided with cone 15 and slip 16 between lower back cap 17 and lower centralizing sleeve 11, and slip 16 is matched with the outer surface of cone 15 through internal taper groove;It is provided with ring groove 24 between tension rod 13 and the inside of cone 15, is provided with internal ball 12 in ring groove 24, and is provided with neck 23 that is matched with internal ball 12 in the central hole of cone 15 inside and tension rod 13 passes through.

[0020] The cone 15, the sealing sleeve 14 and the slip 16 are soluble materials.

[0021] The cone 15, the sealing sleeve 14 and the slip 16 are provided with wear-resistant and corrosion-resistant coating on surfaces.

[0022] The cone 15 is further provided with the sealing sleeve 14 outside, and the lower surface of the sealing sleeve 14 corresponds to the slip 16.

[0023] The sealing sleeve 14 is provided with the sealing ring 22 on the surface through the sealing groove.

[0024] The upper joint 1 is rotatably provided with an upper centralizer 2, and the upper centralizer 2 and the lower centralizer 11 are provided with a liquid passing groove.

[0025] The outer diameters of the upper centralizer 2 and the lower centralizer 11 are greater than the maximum outer diameters of the cone 15, the sealing sleeve 14 and the slip 16.

[0026] The upper centralizer 2 can rotate freely, and the outer wall of the upper and lower centralizers 11 is provided with a spiral liquid passing groove. The tool is forcibly centered by the upper and lower centralizers. The outer end of the central pipe 3 is sleeved with a piston 4 and a push sleeve 6. The piston 4 and the push sleeve 6 are threadedly connected. The piston 4 and the push sleeve 6 are externally sleeved with a cylinder 5. The push sleeve 6 is threadedly connected with the lower centralizer 11. The outer surface of the lower centralizer 11 is provided with a spiral groove. The lower end of the flower pipe 10 is threadedly connected with a tension rod 13. The lower end of the tension rod 13 is fixed with a lower back cap 17 by a release shear pin 18. The tension rod 13 is externally provided at the upper end with the cone 15, the sealing sleeve 14 and the slip 16. The three parts are made of soluble material. The outer side of the sealing sleeve 14 is provided with a sealing ring 22. During setting, the sealing sleeve 14 expands while sliding on the cone 15, and gradually expands to contact the sleeve to seal the travel. At the same time, the slip 16 expands to contact the sleeve to anchor. The lower centralizer 11 is threadedly connected with the push sleeve 6 and is installed on the upper side of the cone 15. The sealing sleeve 14 is clamped between the cone 15 and the lower back cap 17. The lower back cap 17 and the slip 16 are installed on the lower side of the sealing sleeve 14. The cone 15 is internally provided with a ring groove 24, which forms a space with the tension rod 13 to install an internal ball 12. The middle inner hole of the cone 15 is provided with a necking 23, which is a sealing surface for the internal ball 12. After the setting action is completed, the release shear pin 18 is cut off, the tension rod 13 moves upward, the internal ball 12 is centrally positioned, and the ball forms a seal with the reduced inner hole of the cone 15. This prevents the upper high-pressure liquid from flowing downward during cementing.

[0027] The upper centralizer 2 can rotate freely, and the outer wall is provided with a spiral liquid passing groove. The cone 15, the sealing sleeve 14, the slip 16 and the lower back cap 17 are made of soluble magnesium-aluminum alloy material. The sealing sleeve 14, the slip 16 and the cone 15 have a contact angle of 3-12°. The outer surfaces of the cone 15, the sealing sleeve 14, the slip 16 and the lower back cap 17 are sprayed with a wear-resistant and corrosion-resistant coating. Before setting, the soluble parts of the packer are protected from contact with the liquid in the well, and the packer will not be activated and dissolved. The maximum diameters of the upper centralizer 2 and the lower centralizer 11 are much greater than the maximum outer diameters of the other soluble parts, and the other soluble parts are in a protected state during the process of lowering into the well.

[0028] The working process is as follows.

[0029] Setting: the upper joint 1 connects the tubing string (the tubing string is not shown in the figure), after the tubing string is lowered to the set position, the sealing sleeve 14 is expanded by pressing in the tubing, the piston 4, the push sleeve 6, the lower centralizing sleeve 11, the cone 15, the cone expansion sealing sleeve 14 and the slips 16 are expanded, the soluble metal sealing sleeve 14 is deformed, finally, the sealing sleeve 14 is in contact with the casing to seal, at the same time, the slips 16 are expanded and deformed to be in contact with the casing to lock, and the setting is completed.

[0030] Working: since the sealing ring 22 is installed on the outer surface of the sealing sleeve 14, the effective sealing can still be completed for the slight deformation of the casing. After the drop-off shear pin 18 is sheared, the tension rod 13 is raised, and the built-in ball 12 is centered and sealed. The cone 15, the sealing sleeve 14, the slips 16 and the built-in ball 12 form a cement support in the casing. The cementing operation can be performed, and the cement well central tube 3 passes through the sidewall hole of the flower tube 10 to enter the pipe outside string groove in the casing annulus.

[0031] Unsealing: before the cement is completely solidified, the original tubing string is pulled out, the cement plug or the retainer is drilled out by the scraper, or the cement above the retainer position is drilled out to allow the retainer to be dissolved automatically, thereby saving the drilling time.

[0032] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical solutions described in the utility model embodiments, and the person skilled in the art should understand that the utility model can still be modified or replaced equivalently to achieve the same technical effect, as long as the use needs are met, which is within the protection scope of the utility model.

Claims

1. A cement retainer comprising an upper joint (1), characterised in that: The upper joint (1) is fixedly connected with the upper end of the central pipe (3), the outer lower end of the central pipe (3) is fixedly provided with a flower pipe (10), the inner lower end of the central pipe (3) is provided with a ball seat (8) connected with the upper part of the flower pipe (10) through a seat seal shear pin, the ball seat (8) is provided with a seat seal ball, the inner lower part of the flower pipe (10) is provided with a containing groove of the ball seat (8), and the surface of the flower pipe (10) is provided with a first through hole (20) in communication with the containing groove; the lower end of the flower pipe (10) is fixedly connected with a tension rod (13), and the lower end of the tension rod (13) is fixedly connected with a lower back cap (17) through a release shear pin (18); the central pipe (3) is provided with a cylinder (5), and a cavity (19) is arranged between the central pipe (3) and the cylinder (5); the upper end of the cavity (19) is provided with a piston (4), and the central pipe (3) is in communication with the cavity (19) above the piston (4); the lower end of the piston (4) is fixedly provided with a push sleeve (6), the push sleeve (6) is provided with a second through hole (21) corresponding to the first through hole (20), and the lower end of the push sleeve (6) is fixedly provided with a lower centralizing sleeve (11), and the upper end surface of the lower centralizing sleeve (11) corresponds to the lower end surface of the cylinder; the lower back cap (17) and the lower centralizing sleeve (11) are provided with a cone (15) and a slip (16), the slip (16) is matched with the outer surface of the cone (15) through an internal taper groove; the ring groove (24) is arranged between the tension rod (13) and the inside of the cone (15), the built-in ball (12) is arranged in the ring groove (24), and the necking (23) matched with the built-in ball (12) is arranged in the central hole of the cone (15) where the tension rod (13) passes through.

2. A cement retainer according to claim 1, characterised in that: The cone (15), the sealing sleeve (14) and the slip (16) are made of soluble material.

3. A cement retainer according to claim 2, characterised in that: The surface of the cone (15), the sealing sleeve (14) and the slip (16) is provided with a wear-resistant and corrosion-resistant coating.

4. A cement retainer according to claim 1, wherein: The cone (15) is further provided with the sealing sleeve (14), and the lower surface of the sealing sleeve (14) corresponds to the slip (16).

5. A cement retainer according to claim 4, characterised in that: The surface of the sealing sleeve (14) is provided with a sealing ring (22) through a sealing groove.

6. A cement retainer according to claim 1, wherein: The upper joint (1) is rotatably provided with an upper centralizing sleeve (2), and the upper centralizing sleeve (2) and the lower centralizing sleeve (11) are provided with a liquid passing groove.

7. A cement retainer according to claim 6, characterised in that: The outer diameters of the upper centralizing sleeve (2) and the lower centralizing sleeve (11) are greater than the maximum outer diameters of the cone (15), the sealing sleeve (14) and the slip (16).

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