Grading hoop for well cementation

Abstract

The grading hoop for well cementation comprises a fixed sleeve and a movable plate, slurry outlet holes are symmetrically formed in the middles of the two sides of the fixed sleeve, the upper end of the inner side face of the fixed sleeve is symmetrically connected with embedded plates, the lower ends of the embedded plates are connected into embedded grooves in a sliding mode, the embedded grooves are symmetrically formed in the two sides of a sealing layer, and the movable plate is connected with the fixed sleeve. Meanwhile, the sealing layer is fixedly connected to the side face of the movable plate, the middle of the upper surface of the movable plate is fixedly connected with a hydraulic rod through a reinforcing block, a flow guide groove is formed in the edge of the upper surface of the movable plate, circulating holes are formed in the sealing layer and the movable plate, and the two ends of the circulating holes communicate with the embedding groove and the flow guide groove correspondingly. According to the grading hoop, the moving plate, the sealing layer, the embedding plate and the flow guide groove are matched, so that the internal structure of the grading hoop does not need to be drilled when the grading hoop is actually used, the use convenience can be improved, and the probability of internal damage of the grading hoop can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cementing grading collars, in particular to a grading collar for cementing. Background Art

[0002] The grading collar is a grading cementing device, which is mainly used in multi-stage cementing projects to achieve cementing effects by sectional cementing. The grading collars currently used on the market basically require the drill pipe to be lowered after the secondary cementing operation, and the rubber plug and the rubber plug seat remaining in the position of the grading collar are drilled out before subsequent operations can be carried out. However, in the process of drilling out the grading collar, it is easy to damage the body of the grading collar, which has a serious impact on the overall strength of the grading collar. In severe cases, the grading collar cannot be used any longer, which poses a great hidden danger to the cementing quality of the grading collar. Utility Model Content

[0003] In order to overcome the defects of the prior art, a stepping collar for cementing is provided to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, a grading collar for cementing is provided, comprising: a fixed sleeve and a movable plate, the upper end of the fixed sleeve is fixedly connected to the upper joint, and the lower end of the fixed sleeve is fixedly connected to the lower joint, and the upper end of the lower joint is connected to the limit ring through a guide sleeve, slurry outlet holes are symmetrically provided in the middle of both sides of the fixed sleeve, and the upper end of the inner side surface of the fixed sleeve is symmetrically connected to the engaging plate, and the lower end of the engaging plate is slidably connected in the engaging groove, and the engaging groove is symmetrically provided on both sides of the sealing layer, and the sealing layer is fixedly connected to the side of the movable plate, the middle part of the upper surface of the movable plate is fixedly connected to the hydraulic rod through a reinforcement block, and a guide groove is provided at the edge of the upper surface of the movable plate, and the sealing layer and the movable plate both have flow holes, and the two ends of the flow hole are respectively connected to the engaging groove and the guide groove.

[0005] Preferably, the movable plate is in a cylindrical structure as a whole, and an auxiliary groove is provided in the middle of the lower surface of the movable plate, the auxiliary groove is in a truncated cone structure, and the guide groove provided on the upper surface of the movable plate is in a circular ring structure.

[0006] Preferably, the bottom of the guide groove is inclined downward on one side close to the flow hole, and the two groups of flow holes connected on both sides of the guide groove are both square structures. At the same time, the axial cross-section formed by the movable plate, the guide groove and the auxiliary groove combined together is a W-shaped structure.

[0007] Preferably, the sealing layer has a cylindrical structure, the inner diameter of the sealing layer and the outer diameter of the movable plate are matched in size, and the inner arc surface of the sealing layer is circumferentially surrounded by six groups of fixedly connected positioning parts with equal intervals, and the six groups of positioning parts are all rectangular structures, and the length of the positioning parts is less than the axial length of the sealing layer.

[0008] Preferably, a positioning groove is provided on the outer arc surface of the movable plate corresponding to the position of the positioning portion, and the sizes of the positioning portion and the positioning groove are matched, and the sizes of the outer diameter of the sealing layer and the inner diameter of the fixed sleeve are matched.

[0009] Preferably, there are two groups of mosaic plates, the bending parts on the upper ends of the two groups of mosaic plates are fixedly connected to the inner side surface of the fixed sleeve, and the two groups of mosaic plates are respectively located directly above the two groups of slurry outlet holes, and the lower ends of the mosaic plates and the sizes of the mosaic grooves are matched.

[0010] Preferably, the two sets of engaging grooves opened on both sides of the sealing layer are both rectangular structures, and the size of the engaging grooves is larger than the size of the flow hole. At the same time, the reinforcement block fixedly connected to the upper surface of the movable plate is a truncated cone structure, and the inner cavity of the reinforcement block is adapted to the size of the lower end of the hydraulic rod.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the movable plate and the sealing layer can be pushed to move in the fixed sleeve by the hydraulic rod, so that the flow hole opened in the movable plate can be directly opposite to the slurry outlet hole opened in the fixed sleeve, so as to ensure that the grading collar can be grouting, thereby avoiding the use of drilling tools to drill out the internal structure of the grading collar, and thus the grading collar will not be damaged during the cementing process, so that the overall strength of the grading collar will not be affected, which can ensure that the grading collar can continue to be used normally and reduce the probability of hidden dangers in the cementing quality of the grading collar. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view schematic diagram of an embodiment of the utility model.

[0013] Figure 2 It is a top view schematic diagram of an embodiment of the utility model.

[0014] Figure 3 It is a schematic diagram of the cross-sectional structure of the movable plate of an embodiment of the utility model.

[0015] Figure 4 It is a schematic side view of a movable plate according to an embodiment of the utility model.

[0016] In the figure: 1. hydraulic rod; 2. upper joint; 3. fixed sleeve; 4. reinforcement block; 5. flow hole; 6. movable plate; 7. slurry outlet hole; 8. guide sleeve; 9. lower joint; 10. sealing layer; 11. fitting groove; 12. fitting plate; 13. guide groove; 14. positioning part. DETAILED DESCRIPTION

[0017] Reference Figures 1 to 4As shown, the utility model provides a grading collar for cementing, comprising: a fixed sleeve 3 and a movable plate 6, the upper end of the fixed sleeve 3 is fixedly connected to the upper joint 2, and the lower end of the fixed sleeve 3 is fixedly connected to the lower joint 9, and the upper end of the lower joint 9 is connected to the limit ring through a guide sleeve 8, slurry outlet holes 7 are symmetrically opened in the middle of both sides of the fixed sleeve 3, and the upper end of the inner side surface of the fixed sleeve 3 is symmetrically connected to the embedding plate 12, and the lower end of the embedding plate 12 is slidably connected in the embedding groove 11, and the embedding groove 11 is symmetrically opened on both sides of the sealing layer 10, and the sealing layer 10 is fixedly connected to the side of the movable plate 6, the middle part of the upper surface of the movable plate 6 is fixedly connected to the hydraulic rod 1 through the reinforcement block 4, and the edge of the upper surface of the movable plate 6 is opened with a guide groove 13, and the sealing layer 10 and the movable plate 6 are both opened with a flow hole 5, and the two ends of the flow hole 5 are respectively connected to the embedding groove 11 and the guide groove 13.

[0018] In this embodiment, before the grouting operation is performed, the hydraulic rod 1 is controlled to move downward by the output shaft of the external hydraulic press, and then the hydraulic rod 1 can push the movable plate 6 and the sealing layer 10 to move downward synchronously. In the process of the sealing layer 10 moving downward, the lower end of the mosaic plate 12 will gradually break away from the flow hole 5 opened in the sealing layer 10, and then the blocking of the flow hole 5 by the mosaic plate 12 is released. Then, when the lower surface of the sealing layer 10 abuts against the limit ring, the flow hole 5 can be completely connected with the slurry outlet hole 7. At this time, the grouting operation can be carried out normally, and the slurry will flow into the flow hole 5 through the guide groove 13, so that the slurry can flow smoothly. The grouting hole 7 can be easily flowed out from the grouting hole 7. After the grouting operation is completed, the hydraulic rod 1 is driven upward by an external hydraulic machine, and then the hydraulic rod 1 can drive the movable plate 6 and the sealing layer 10 to reset synchronously, wherein the mosaic plate 12 can be re-embedded in the mosaic groove 11, and can effectively avoid the problem of accidental deflection of the sealing layer 10 and the movable plate 6 during the movement, ensuring that the grouting hole 7 and the circulation hole 5 can be smoothly connected, and through the cooperation of the mosaic plate 12 and the sealing layer 10, the grouting hole 7 and the circulation hole 5 have a double sealing structure, thereby enhancing the sealing performance of the grading collar during the cementing process.

[0019] As a preferred embodiment, the movable plate 6 is cylindrical in structure as a whole, and an auxiliary groove is opened in the middle of the lower surface of the movable plate 6, the auxiliary groove is a truncated cone structure, and the guide groove 13 opened on the upper surface of the movable plate 6 is a circular ring structure.

[0020] In this embodiment, if Figure 1 , Figure 2 and Figure 3 The structural setting of the auxiliary groove enables the movable plate 6 to reduce its own material and weight while ensuring its own structural strength, thereby effectively reducing the production cost of the grading hoop.

[0021] As a preferred embodiment, the bottom of the guide groove 13 is inclined downward on one side close to the flow hole 5, and the two groups of flow holes 5 connected on both sides of the guide groove 13 are both square structures. At the same time, the axial cross-section formed by the movable plate 6, the guide groove 13 and the auxiliary groove is a W-shaped structure.

[0022] In this embodiment, if Figure 1 , Figure 2 and Figure 3 The structural setting of the guide groove 13 enables the slurry to flow quickly to the flow hole 5, which helps to improve the efficiency of the grouting effect. At the same time, the guide groove 13 with a circular ring structure enables the number of slurry outlet holes 7 of the grading hoop to be adjusted accordingly according to actual needs, which is convenient for subsequent improvements of the grading hoop.

[0023] As a preferred embodiment, the sealing layer 10 has a cylindrical structure, the inner diameter of the sealing layer 10 is matched with the outer diameter of the movable plate 6, and the inner arc surface of the sealing layer 10 is circumferentially surrounded by six groups of fixedly connected positioning parts 14 at equal intervals. At the same time, the six groups of positioning parts 14 are all rectangular structures, and the length of the positioning part 14 is less than the axial length of the sealing layer 10.

[0024] In this embodiment, if Figure 2 and Figure 4 The sealing layer 10 is made of soft rubber material, which can effectively enhance the sealing between the fixed sleeve 3 and the movable plate 6. At the same time, the setting of the positioning portion 14 can assist in enhancing the fixing effect between the sealing layer 10 and the movable plate 6, and avoid the problem of accidental falling off of the sealing layer 10.

[0025] As a preferred embodiment, a positioning groove is provided on the outer arc surface of the movable plate 6 corresponding to the position of the positioning portion 14 , and the sizes of the positioning portion 14 and the positioning groove match, and the outer diameter of the sealing layer 10 and the inner diameter of the fixed sleeve 3 match.

[0026] In this embodiment, if Figure 2 and Figure 4 The sizes of the positioning portion 14 and the positioning groove are matched, which can further enhance the stability of the connection between the sealing layer 10 and the movable plate 6. Moreover, the inner and outer size settings of the sealing layer 10 can also ensure the sealing effect of the inner and outer arc surfaces of the sealing layer 10.

[0027] As a preferred embodiment, there are two groups of interlocking plates 12, the bending parts at the upper ends of the two groups of interlocking plates 12 are fixedly connected to the inner side surface of the fixed sleeve 3, and the two groups of interlocking plates 12 are respectively located directly above the two groups of slurry outlet holes 7, and at the same time, the lower ends of the interlocking plates 12 and the interlocking grooves 11 are matched in size.

[0028] In this embodiment, if Figure 2 and Figure 3The setting of the interlocking plate 12 can effectively limit the moving range of the movable plate 6 and the sealing layer 10, thereby ensuring the sealing effect of the on-off connection between the slurry outlet hole 7 and the flow hole 5, and can also effectively limit the rotation of the sealing layer 10 and the movable plate 6, ensuring that the sealing layer 10 and the movable plate 6 will not deflect during the axial movement along the fixed sleeve 3.

[0029] As a preferred embodiment, the two sets of engaging grooves 11 opened on both sides of the sealing layer 10 are both rectangular structures, and the size of the engaging grooves 11 is larger than the size of the flow hole 5. At the same time, the reinforcement block 4 fixedly connected to the upper surface of the movable plate 6 is a truncated cone structure, and the inner cavity of the reinforcement block 4 is adapted to the size of the lower end of the hydraulic rod 1.

[0030] In this embodiment, if Figure 2 and Figure 3 The size of the interlocking groove 11 is larger than the size of the circulation hole 5. After the interlocking plate 12 is completely embedded in the interlocking groove 11, the interlocking plate 12 can smoothly block the circulation hole 5, so that the circulation hole 5 and the slurry outlet hole 7 can have a double sealing structure. The setting of the reinforcement block 4 can help enhance the stability of the connection between the hydraulic rod 1 and the movable plate 6, and reduce the probability of accidental breakage between the hydraulic rod 1 and the movable plate 6.

[0031] The utility model provides a grading collar for cementing, through the cooperation of the movable plate 6, the sealing layer 10, the interlocking plate 12 and the guide groove 13, so that when the grading collar is actually used, there is no need to drill out the internal structure of the grading collar, which can not only improve the convenience of use, but also reduce the probability of internal damage to the grading collar. At the same time, the double sealing structure can enhance the sealing effect of the grading collar.

Claims

1. A grading collar for cementing, comprising: A fixed sleeve (3) and a movable plate (6), wherein the upper end of the fixed sleeve (3) is fixedly connected to the upper joint (2), and the lower end of the fixed sleeve (3) is fixedly connected to the lower joint (9), and the upper end of the lower joint (9) is connected to the limiting ring through a guide sleeve (8), characterized in that: pulp outlet holes (7) are symmetrically provided in the middle of both sides of the fixed sleeve (3), and the upper end of the inner side surface of the fixed sleeve (3) is symmetrically connected to the engaging plate (12), and the lower end of the engaging plate (12) is slidably connected to the engaging groove (11 ), and the engaging grooves (11) are symmetrically arranged on both sides of the sealing layer (10), and the sealing layer (10) is fixedly connected to the side of the movable plate (6), the middle of the upper surface of the movable plate (6) is fixedly connected to the hydraulic rod (1) through the reinforcing block (4), and the guide groove (13) is arranged at the edge of the upper surface of the movable plate (6), and the sealing layer (10) and the movable plate (6) are both provided with a flow hole (5), and the two ends of the flow hole (5) are respectively connected to the engaging groove (11) and the guide groove (13).

2. A grading collar for cementing according to claim 1, characterized in that: The movable plate (6) is in the shape of a cylinder as a whole, and an auxiliary groove is provided in the middle of the lower surface of the movable plate (6), the auxiliary groove being in the shape of a truncated cone, while the guide groove (13) provided on the upper surface of the movable plate (6) is in the shape of a circular ring.

3. A grading collar for cementing according to claim 1, characterized in that: The bottom of the guide groove (13) is inclined downward on one side close to the flow hole (5), and the two groups of flow holes (5) connected on both sides of the guide groove (13) are both square in structure, and the axial cross section formed by the combination of the movable plate (6), the guide groove (13) and the auxiliary groove is W-shaped.

4. A grading collar for cementing according to claim 1, characterized in that: The sealing layer (10) is in a cylindrical structure, the inner diameter of the sealing layer (10) and the outer diameter of the movable plate (6) are matched in size, and the inner arc surface of the sealing layer (10) is circumferentially surrounded by six groups of fixedly connected positioning parts (14) at equal intervals, and the six groups of positioning parts (14) are all in a rectangular structure, and the length of the positioning parts (14) is less than the axial length of the sealing layer (10).

5. A grading collar for cementing according to claim 1, characterized in that: A positioning groove is provided on the outer arc surface of the movable plate (6) at a position corresponding to the positioning portion (14), and the sizes of the positioning portion (14) and the positioning groove are matched, and the sizes of the outer diameter of the sealing layer (10) and the inner diameter of the fixed sleeve (3) are matched.

6. A grading collar for cementing according to claim 1, characterized in that: There are two groups of interlocking plates (12), the bending parts at the upper ends of the two groups of interlocking plates (12) are fixedly connected to the inner side surface of the fixed sleeve (3), and the two groups of interlocking plates (12) are respectively located directly above the two groups of pulp outlet holes (7), and the sizes of the lower ends of the interlocking plates (12) and the interlocking grooves (11) are matched.

7. A grading collar for cementing according to claim 1, characterized in that: The two groups of engaging grooves (11) opened on both sides of the sealing layer (10) are both rectangular in structure, and the size of the engaging grooves (11) is larger than the size of the flow hole (5). At the same time, the reinforcing block (4) fixedly connected to the upper surface of the movable plate (6) is in a truncated cone-shaped structure, and the inner cavity of the reinforcing block (4) is compatible with the size of the lower end of the hydraulic rod (1).

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