Screw type ball injector top cover assembly and ball injecting method

Abstract

The invention discloses a spiral ball injector top cover assembly which comprises a mandrel, the top of the mandrel is in threaded connection with a ball loading screwed plug, a channel is formed in the center of the mandrel, the bottom of the mandrel is connected with a spiral shaft, the spiral shaft is sleeved with a guide cylinder, the guide cylinder is sleeved with an outer cylinder, and the mandrel is sequentially and fixedly connected with an upper bearing, a lower bearing and a sealing baffle. The upper bearing is fixed through a top cover upper flange, the lower bearing is fixed through a top cover lower flange, an open type groove is formed in the lower portion of the top cover lower flange, and a rotary seal is arranged in the open type groove. A ball throwing method of the ball throwing device with the spiral top cover assembly comprises the steps that a screwed plug at the top end of the mandrel is opened, the temporary blocking ball is thrown into the mandrel, the temporary blocking ball falls into the spiral shaft, the driven gear is rotated, the driven gear drives the mandrel to rotate, the mandrel drives the spiral shaft to rotate, the temporary blocking ball falls into the bottom end of the ball throwing device, and ball throwing is completed. The screw type ball injector top cover assembly solves the problems that an existing ball injector top cover assembly needs to be disassembled and assembled repeatedly, and a bearing is soaked in liquid for a long time.

Description

Technical Field

[0001] The present invention belongs to the technical field of temporary plugging and diversion fracturing operation equipment for oil and gas fields, relates to a spiral ball injector top cover assembly, and also relates to a ball injection method of a ball injector with a spiral top cover assembly. Background Art

[0002] Deep shale gas fracturing construction often faces problems such as high in-situ stress, strong plasticity, complex distribution of natural fractures and overall underdevelopment, and large difference in horizontal two-way stress. These problems cause difficulties in the initiation and extension of hydraulic fractures during conventional fracturing construction, a relatively small effective transformation volume, and low fracture complexity and conductivity. It is necessary to improve the horizontal lateral coverage rate and fracture complexity of fractures through temporary plugging and diversion fracturing. The temporary plugging and diversion process technology is to put a certain number of temporary plugging balls after fracturing for a period of time to block the perforation holes of the already fractured cracks, thereby forcing the perforation clusters that have not yet initiated to initiate and extend new cracks, further improving the uniformity of the transformation of all perforation clusters. The temporary plugging and diversion fracturing process is an effective method for opening multiple perforation clusters, and the ball injector is one of the key equipment for implementing the temporary plugging and diversion fracturing process.

[0003] In recent years, some multi-ball injectors have emerged at home and abroad, which can achieve rapid multi-ball delivery. However, when the existing ball injector is loaded with balls, the top cover needs to be disassembled and assembled repeatedly, and its bearings are immersed in liquid for a long time. Summary of the Invention

[0004] The first object of the present invention is to provide a spiral ball injector top cover assembly, which solves the problems in the prior art that the top cover assembly of the ball injector needs to be disassembled and assembled repeatedly, and the bearings are immersed in liquid for a long time.

[0005] The second object of the present invention is to provide a ball injection method of a ball injector with a spiral top cover assembly.

[0006] The technical solution of the present invention is: a spiral ball injector top cover assembly, including a mandrel. A ball loading plug is threadedly connected to the top of the mandrel. A channel is provided at the center of the mandrel. A spiral shaft is connected to the bottom of the mandrel. A guide cylinder is sleeved outside the spiral shaft. An outer cylinder is sleeved outside the guide cylinder. An upper bearing, a lower bearing, and a sealing baffle are sequentially fixed on the mandrel. The upper bearing is fixed by an upper flange of the top cover. The lower bearing is fixed by a lower flange of the top cover. A bearing seal I is provided at the contact part between the upper flange of the top cover and the mandrel. A bearing seal II is provided at the contact part between the upper flange of the top cover and the lower flange of the top cover. Fixed bolts are provided above the upper flange of the top cover. An open groove is provided below the lower flange of the top cover. A rotary seal is provided in the open groove. The open groove is threadedly connected to the sealing baffle to form a sealing groove. A groove is provided at the outer edge of the lower flange of the top cover. A main static seal is installed in the groove.

[0007] The characteristics of the present invention also lie in:

[0008] A driven gear is provided at the upper end of the mandrel.

[0009] The connection relationship between the spiral shaft and the core shaft is hexagonal connection or square connection.

[0010] The outside of the outer cylinder is connected with a union by external threads.

[0011] The rotary seal is a spring seal + T-shaped sand control structure.

[0012] The spiral shaft is provided with an inclined spiral.

[0013] Another technical solution of the present invention is a ball throwing method of a ball thrower with a spiral top cover assembly, and the specific steps are as follows:

[0014] Step 1. Open the ball plug at the top end of the core shaft, and put the temporary plug balls A, B, C, D, E, A, B, C, D, E into the core shaft, and the temporary plug balls fall into the spiral shaft;

[0015] Step 2. Rotate the driven gear, the driven gear drives the core shaft to rotate, the core shaft drives the spiral shaft to rotate, and the temporary plug balls A, B, C, D, E fall along the rib spiral of the spiral shaft to the bottom end of the ball thrower, and the ball throwing is completed.

[0016] The beneficial effects of the present invention are:

[0017] (1) The spiral ball thrower top cover assembly is designed with a ball loading channel, and the balls can be quickly loaded without disassembling the top cover, reducing the frequent disassembly of the top cover.

[0018] (2) The upper bearing and the lower bearing on the spiral ball thrower top cover assembly are installed outside the rotary seal. The upper bearing and the lower bearing do not contact the liquid, and there is no risk of sand jamming and rust, and the bearing life is long. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the spiral ball thrower top cover assembly of the present invention;

[0020] Figure 2 It is a schematic diagram of the ball loading state of the spiral ball thrower top cover assembly of the present invention;

[0021] Figure 3 It is a schematic diagram of the spiral ball thrower top cover assembly of the present invention applied to a ball thrower.

[0022] In the figure, 1. ball-loading plug, 2. mandrel, 3. driven gear, 4. fixing bolt, 5. upper flange of top cover, 6. upper bearing, 7. lower bearing, 8. lower flange of top cover, 9. rotary seal, 10. sealing baffle, 11. guide cylinder, 12. union, 13. spiral shaft, 14. outer cylinder, 15. main static seal, 16. bearing seal II, 17. bearing seal I, 18. open groove, 19. sealing groove, 20. groove, 21. base assembly, 1001. temporary plugging ball A, 1002. temporary plugging ball B, 1003. temporary plugging ball C, 1004. temporary plugging ball D, 1005. temporary plugging ball E. Detailed implementation mode

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and the specific implementation mode.

[0024] The top cover assembly of the spiral ball injector of the present invention, as Figure 1 shown, includes a mandrel 2. A ball-loading plug 1 is threadedly connected to the top of the mandrel 2. A channel is provided at the center of the mandrel 2. A spiral shaft 13 is connected to the bottom of the mandrel 2. A guide cylinder 11 is sleeved outside the spiral shaft 13. An outer cylinder 14 is sleeved outside the guide cylinder 11. An upper bearing 6, a lower bearing 7, and a sealing baffle 10 are sequentially fixedly connected to the mandrel 2. The upper bearing is fixed by the upper flange 5 of the top cover, and the lower bearing is fixed by the lower flange 8 of the top cover. A bearing seal I 17 is provided at the contact part between the upper flange 5 of the top cover and the mandrel 2. A bearing seal II 16 is provided at the contact part between the upper flange 5 of the top cover and the lower flange 8 of the top cover. A fixing bolt 4 is provided above the upper flange 5 of the top cover. An open groove 18 is opened below the lower flange 8 of the top cover. A rotary seal 9 is provided in the open groove 18. The open groove 18 is threadedly connected to the sealing baffle 10 to form a sealing groove 19. A groove 20 is opened at the outer edge of the lower flange 8 of the top cover. A main static seal 15 is installed in the groove 20. A driven gear 3 is installed at the upper end of the mandrel 2, and external power can be connected to remotely drive the rotation of the mandrel 2. The outer cylinder 14 is threadedly connected with a union 12. The union 12 is threadedly connected with the outer cylinder 14, and the installation or disassembly can be completed by hammering the union 12.

[0025] The ball-loading state of the top cover assembly of the spiral ball injector of the present invention, as Figure 2 shown, after the ball-loading plug 1 is opened, temporary plugging balls A 1001, B 1002, C 1003, D 1004, and E 1005 are put into the mandrel 2. The temporary plugging balls A 1001, B 1002, C 1003, D 1004, and E 1005 fall into the spiral shaft 13. The driven gear 3 is rotated, the driven gear 3 drives the mandrel 2 to rotate, the mandrel 2 drives the spiral shaft 13 to rotate, and the temporary plugging balls A 1001, B 1002, C 1003, D 1004, and E 1005 spiral down along the ribs of the spiral shaft 13 to the bottom end of the ball injector, and the ball injection is completed.

[0026] The top cover assembly of the spiral ball thrower of the present invention is applied to a ball thrower. For example, Figure 3 As shown, the top cover assembly of the spiral ball thrower of the present invention is matched with the base assembly 21, and the application of the top cover assembly of the spiral ball thrower of the present invention on the ball thrower can be realized.

[0027] The functions of the main components in the top cover assembly of the spiral ball thrower of the present invention are as follows:

[0028] Bearing seal Ⅰ 17: Prevent the leakage of lubricating fluid between bearings.

[0029] Spiral shaft 13: Convey the temporary plugging balls.

[0030] Upper flange 5 of the top cover: Used in combination with the lower flange 8 of the top cover to fix the upper bearing 6 and the lower bearing 7 respectively.

[0031] The present invention also provides a ball throwing method for a ball thrower with a spiral top cover assembly. The specific steps are as follows:

[0032] Step 1. Open the ball loading plug 1 at the top of the mandrel 2, and put the temporary plugging balls A1001, temporary plugging balls B1002, temporary plugging balls C1003, temporary plugging balls D1004, temporary plugging balls E1005 into the mandrel 2. The temporary plugging balls A1001, temporary plugging balls B1002, temporary plugging balls C1003, temporary plugging balls D1004, temporary plugging balls E1005 fall into the spiral shaft 13.

[0033] Step 2. Rotate the driven gear 3. The driven gear 3 drives the mandrel 2 to rotate, and the mandrel 2 drives the spiral shaft 13 to rotate. The temporary plugging balls A1001, temporary plugging balls B1002, temporary plugging balls C1003, temporary plugging balls D1004, temporary plugging balls E1005 fall along the rib spiral of the spiral shaft 13 to the bottom end of the ball thrower, and the ball throwing is completed.

[0034] Embodiment 1

[0035] The top cover assembly of the spiral ball thrower of the present invention includes a mandrel 2. A ball loading plug 1 is threadedly connected to the top of the mandrel 2. A channel is provided at the center of the mandrel 2. The bottom of the mandrel 2 is connected to a spiral shaft 13. A guide cylinder 11 is sleeved outside the spiral shaft 13. An outer cylinder 14 is sleeved outside the guide cylinder 11. An upper bearing 6, a lower bearing 7, and a sealing baffle 10 are sequentially fixed on the mandrel 2. The upper bearing is fixed by the upper flange 5 of the top cover, and the lower bearing is fixed by the lower flange 8 of the top cover. A bearing seal Ⅰ 17 is provided at the contact part between the upper flange 5 of the top cover and the mandrel 2. A bearing seal Ⅱ 16 is provided at the contact part between the upper flange 5 and the lower flange 8 of the top cover. Fixed bolts 4 are provided above the upper flange 5 of the top cover. An open groove 18 is provided below the lower flange 8 of the top cover. A rotary seal 9 is provided in the open groove 18. The open groove 18 is threadedly connected to the sealing baffle 10 to form a sealing groove 19. A groove 20 is provided at the outer edge of the lower flange 8 of the top cover. A main static seal 15 is installed in the groove 20.

[0036] Example 2

[0037] The spiral ball feeder top cover assembly of the present invention includes a mandrel 2. A ball loading plug 1 is threadedly connected to the top of the mandrel 2. A channel is provided at the center of the mandrel 2. The bottom of the mandrel 2 is connected to a spiral shaft 13. A guide cylinder 11 is sleeved outside the spiral shaft 13. An outer cylinder 14 is sleeved outside the guide cylinder 11. An upper bearing 6, a lower bearing 7, and a sealing baffle 10 are sequentially fixed on the mandrel 2. The upper bearing is fixed by an upper flange 5 of the top cover, and the lower bearing is fixed by a lower flange 8 of the top cover. A bearing seal I 17 is provided at the contact part between the upper flange 5 of the top cover and the mandrel 2. A bearing seal II 16 is provided at the contact part between the upper flange 5 and the lower flange 8 of the top cover. Fixed bolts 4 are provided above the upper flange 5 of the top cover. An open groove 18 is provided below the lower flange 8 of the top cover. A rotary seal 9 is provided in the open groove 18. The open groove 18 is threadedly connected to the sealing baffle 10 to form a sealing groove 19. A groove 20 is provided at the outer edge of the lower flange 8 of the top cover. A main static seal 15 is installed in the groove 20. A driven gear 3 is provided at the upper end of the mandrel 2. A union 12 is threadedly connected to the outside of the spiral shaft 13.

[0038] Example 3

[0039] The present invention provides a ball feeding method for a ball feeder with a spiral top cover assembly. The specific steps are as follows:

[0040] Step 1. Open the ball loading plug 1 at the top end of the mandrel 2, and put temporary plug balls A1001, B1002, C1003, D1004, E1005 into the mandrel 2. The temporary plug balls A1001, B1002, C1003, D1004, E1005 fall into the spiral shaft 13.

[0041] Step 2. Rotate the driven gear 3. The driven gear 3 drives the mandrel 2 to rotate, and the mandrel 2 drives the spiral shaft 13 to rotate. The temporary plug balls A1001, B1002, C1003, D1004, E1005 spiral down along the ribs of the spiral shaft 13 to the bottom end of the ball feeder, and the ball feeding is completed.

[0042] The advantages of the spiral ball feeder top cover assembly of the present invention are that through the ball loading channel designed inside the mandrel, the balls can be quickly loaded without disassembling the top cover during use, reducing the frequent disassembly of the top cover.

Claims

1. Spiral ball feeder top cover assembly, Characterized in that, It includes a mandrel (2), a ball-loading plug (1) is threadedly connected to the top of the mandrel (2), a channel is provided at the center of the mandrel (2), a spiral shaft (13) is connected to the bottom of the mandrel (2), a guide cylinder (11) is sleeved outside the spiral shaft (13), an outer cylinder (14) is sleeved outside the guide cylinder (11), an upper bearing (6), a lower bearing (7), and a sealing baffle (10) are sequentially fixed on the mandrel (2), the upper bearing is fixed by an upper flange of the top cover (5), the lower bearing is fixed by a lower flange of the top cover (8), a bearing seal I (17) is provided at the contact part between the upper flange of the top cover (5) and the mandrel (2), a bearing seal II (16) is provided at the contact part between the upper flange of the top cover (5) and the lower flange of the top cover (8), fixing bolts (4) are provided above the upper flange of the top cover (5), an open groove (18) is opened below the lower flange of the top cover (8), a rotary seal (9) is provided in the open groove (18), and the open groove (18) is threadedly connected to the sealing baffle (10) to form a sealing groove (19), a groove (20) is opened at the outer edge of the lower flange of the top cover (8), and a main static seal (15) is installed in the groove (20).

2. The spiral ball feeder top cover assembly according to claim 1, Characterized in that A driven gear (3) is provided at the upper end of the mandrel (2).

3. The spiral ball feeder top cover assembly according to claim 1, Characterized in that The connection relationship between the spiral shaft (13) and the mandrel (2) is a hexagonal connection or a square connection.

4. The spiral ball feeder top cover assembly according to claim 1, Characterized in that A union (12) is threadedly connected to the outside of the outer cylinder (14).

5. The spiral ball feeder top cover assembly according to claim 1, Characterized in that The rotary seal (9) is a spring seal + T-shaped sand prevention structure.

6. The spiral ball feeder top cover assembly according to claim 1, Characterized in that The spiral shaft (13) is provided with an inclined spiral.

7. The ball feeding method of a ball feeder with a spiral top cover assembly, Characterized in that, This method uses the ball feeder of the spiral ball feeder top cover assembly described in any one of claims 1-6, and is specifically implemented according to the following steps: Step 1. Open the ball-loading plug (1) at the top end of the mandrel (2), and put the temporary plug balls A (1001), temporary plug balls B (1002), temporary plug balls C (1003), temporary plug balls D (1004), temporary plug balls E (1005), temporary plug balls A (1001), temporary plug balls B (1002), temporary plug balls C (1003), temporary plug balls D (1004), temporary plug balls E (1005) into the mandrel (2), and the temporary plug balls fall into the spiral shaft (13); Step 2. Rotate the driven gear (3), the driven gear (3) drives the mandrel (2) to rotate, the mandrel (2) drives the screw shaft (13) to rotate, and the temporary plug balls A (1001), temporary plug balls B (1002), temporary plug balls C (1003), temporary plug balls D (1004), and temporary plug balls E (1005) fall along the rib helix of the screw shaft (13) to the bottom end of the ball feeder, and the ball feeding is completed.

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