Spiral counter and well cementation sliding sleeve system

Abstract

The invention discloses a spiral counter and a well cementation sliding sleeve system, and relates to the technical field of oil and gas field fracturing, the spiral counter is arranged at the bottom end of a bridge plug, and the spiral counter comprises a shell, a plurality of positioning assemblies arrayed along the circumference of the shell, an ejector rod, a rotary drum and an insertion rod. A circle of clamping groove is formed in the inner wall of the sliding sleeve; the body pipe at the center of the bridge plug downwards penetrates into the shell, the inserting rod is fixedly arranged at the bottom of the body pipe, the bottom of the inserting rod is supported on a step on the inner wall of the rotary drum, the first end of the ejector rod is supported on a step on the inner wall of the shell, and the rotary drum is located at the top of the ejector rod; when the positioning assembly downwards crosses the clamping groove of one layer of sliding sleeve, the positioning assembly is promoted to expand and then polymerize, and in the whole process, the rotating drum is promoted to rotate by a preset angle; and when the rotating drum rotates for preset times and the positioning assembly expands into the clamping groove of the corresponding layer of sliding sleeve, the positioning assembly does not aggregate. According to the scheme, a cable is not needed, and the bridge plug can be quickly and accurately clamped in the sliding sleeve of the corresponding layer.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field fracturing, and in particular to a spiral counter and a cementing sleeve system. Background Art

[0002] The cementing sleeve system is a device commonly used in fracturing operations in oil and gas fields, and is mainly used to form a channel in the wellbore to control the flow of fluid. CN113605859A discloses a cementing sleeve system and a method of use, a cementing sleeve assembly method and a maintenance method. The specification of the cementing sleeve system in paragraphs

[0086] -

[0096] records the method of use of the cementing sleeve system. The toe sleeve and the cementing sleeve are lowered into the wellbore to the designed depth according to the operation requirements; after the cementing is completed, the toe sleeve is opened and fracturing is performed; after the fracturing is completed, a soluble bridge plug is placed into the first layer of cementing sleeve. When the soluble bridge plug reaches the position of the first layer of cementing sleeve, it is lowered 20 to 40 meters more, the cementing sleeve is reversed, and the reversed suspended weight is measured. When the soluble bridge plug approaches the position of the first layer of cementing sleeve, if there is an over-lift reaction, then within 0.5T of suspended weight over-lift, stop over-lifting and correct the depth; after confirming that the depth is correct, ignite the soluble bridge plug to set, and remove the setting tool and cable. The above scheme has the following problems: the method is complicated and time-consuming, and the soluble bridge plug cannot be placed to the preset position quickly and accurately; the placement of the soluble bridge plug requires the use of cables, and accidents are prone to occur in the well. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a spiral counter and cementing sleeve system, which is easy to operate and can clamp the bridge plug in the sleeve of the corresponding layer without the aid of cables.

[0004] In order to achieve the purpose of the present invention, the following scheme is proposed: A spiral counter is arranged at the bottom end of a bridge plug and is used to clamp the bridge plug in a sliding sleeve of a corresponding layer. The counter comprises a shell, a plurality of positioning components arranged along the circumference of the shell, a mandrel, a rotating cylinder and an insertion rod.

[0005] The inner wall of the sliding sleeve is provided with a circle of grooves; The main body tube at the center of the bridge plug is downwardly inserted into the shell, the plug rod is fixedly arranged at the bottom of the main body tube, and the bottom of the plug rod is supported on the step of the inner wall of the rotating drum, the outer diameter of the first end of the mandrel is greater than the outer diameter of the second end thereof, and the first end is supported on the step of the inner wall of the shell, and the rotating drum is located at the top of the mandrel; Each time the positioning assembly passes over the slot of a layer of the sliding sleeve, the positioning assembly will expand first and then converge; when the positioning assembly converges, it will squeeze the push rod and the rotating drum upward; when the positioning assembly expands, the push rod and the rotating drum move down and reset, and the whole process will cause the rotating drum to rotate a preset angle; when the rotating drum rotates a preset number of times and the positioning assembly expands to the slot of the corresponding layer of the sliding sleeve, the push rod and the rotating drum are restricted from moving upward by the limit block on the inner wall of the shell.

[0006] Furthermore, the outer wall of the shell has a plurality of T-slots in a circular array, and a through slot is provided on the inner side of the T-slot, which is connected to the interior of the shell. The positioning assembly includes a positioning block and two pressure blocks. The positioning block is horizontally slidable in the T-slot, and the two pressure blocks are respectively provided at two steps of the T-slot and fixed by bolts. The pressure blocks extend to the outer wall of the positioning block, and a triangular block is provided on the outer wall of the positioning block, and an adjusting rod is provided on the inner wall. The outer wall of the push rod has a plurality of slots in a circular array, and the end face of the adjusting rod is adapted to the corresponding slot through an inclined surface.

[0007] Furthermore, a first gear is provided on the outer wall of the first end of the push rod, and a circle of first saw teeth is formed on the top surface of the first gear; a second gear is provided on the outer wall of the rotating drum, and a circle of second saw teeth is formed on the bottom surface of the second gear. The first saw teeth and the second saw teeth are connected to each other by means of inclined surfaces. The first gear and the second gear have the same number of teeth, and their positions correspond to each other up and down. A circle of limiting teeth is arrayed on the inner wall of the outer shell, and the limiting teeth engage the first gear and the second gear. The inclined surface of the top surface of the limiting teeth is parallel to the inclined surface of the second saw teeth.

[0008] Furthermore, a retaining cylinder is threadedly connected to the top of the outer shell, and the inner wall of the top of the outer shell is threadedly connected to the outer wall of the bottom end of the retaining cylinder, a circular ring is provided on the inner wall of the retaining cylinder, the main body tube is matched in the circular ring, and a mounting ring is threadedly connected to the outer wall of the bottom end of the main body tube, the outer wall of the mounting ring is tightly attached to the inner wall of the retaining cylinder, a spring is provided on the outer periphery of the main body tube, the two ends of the spring are respectively connected to the circular ring and the mounting ring, and the inserted rod is fixed at the bottom of the mounting ring.

[0009] Furthermore, the outer wall of the top of the rotating drum is close to the inner wall of the retaining drum, and the inner wall of the rotating drum is provided with an avoidance groove, which extends upward to the step of the inner wall of the rotating drum. When the rotating drum rotates a preset number of times, the insertion rod faces the avoidance groove.

[0010] Furthermore, a vertical rod is provided on the top of one of the teeth of the second gear, and a stop block is provided on the inner wall of the shell. When the drum rotates a preset number of times, the vertical rod is located below the limit block and is close to the stop block.

[0011] A cementing sleeve system comprises a sleeve, a bridge plug and the spiral counter.

[0012] The beneficial effects of the present invention are as follows: the structures of the positioning component, the push rod, the rotating drum and the insertion rod are ingenious. The positioning component aggregates and expands once, which can prompt the rotating drum inside the counter to rotate to a preset angle. Then, by presetting the number of times the rotating drum can rotate, the positioning component can only expand into the sliding sleeve of the corresponding layer and will no longer aggregate. In this way, the bridge plug can be quickly and accurately stuck in the sliding sleeve of the corresponding layer without the help of cables, thereby reducing the risk of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram showing a spiral counter being stuck in a corresponding layer of sliding sleeves; Figure 2 A cross-sectional view of a spiral counter is shown; Figure 3 for Figure 2 A partial enlarged view of the middle part; Figure 4 The external structure diagram of the first gear and the second gear is shown; Figure 5 A top rod structure diagram is shown; Figure 6 A diagram of the drum structure is shown; Figure 7 A cutaway view of the housing is shown; Figure 8 It shows the structure of the limit tooth and the second gear after a part of the housing is cut off; Fig. 9 Figure 8 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0014] Example 1 like Figure 1 , Figure 2 As shown, this embodiment provides a spiral counter, which is arranged at the bottom end of the bridge plug 1 and is used to clamp the bridge plug 1 in the sliding sleeve of the corresponding layer. The counter includes a shell 2, multiple positioning components 3, a push rod 4, a rotating drum 5 and an insertion rod 6.

[0015] One thing to note here is that since the core innovation of this embodiment lies in the counter, the attached drawings do not specifically show the structure of the sleeve and the bridge plug 1. The structure of the sleeve of this embodiment can refer to the cementing sleeve system recorded in CN113605859A, and the structure of the bridge plug 1 can refer to the soluble bridge plug recorded in CN2024230215815.

[0016] Specifically, the main body tube 11 at the center of the bridge plug 1 is downwardly penetrated into the outer shell 2, more precisely, a retaining cylinder 7 is threadedly connected to the top end of the outer shell 2, and the inner wall of the top end of the outer shell 2 is threadedly connected to the outer wall of the bottom end of the retaining cylinder 7, a circular ring 71 is provided on the inner wall of the retaining cylinder 7, and the main body tube 11 matches the circular ring 71; the insertion rod 6 is fixedly arranged at the bottom of the main body tube 11, more precisely, a mounting ring 61 is threadedly connected to the outer wall of the bottom end of the main body tube 11, the outer wall of the mounting ring 61 is close to the inner wall of the retaining cylinder 7, the insertion rod 6 is fixedly arranged at the bottom of the mounting ring 61, and the bottom of the insertion rod 6 is supported on the step of the inner wall of the rotating cylinder 5; a spring 12 is provided on the outer periphery of the main body tube 11, and the top and bottom ends of the spring 12 are respectively connected to the circular ring 71 and the mounting ring 61; the push rod 4 and the rotating cylinder 5 are both arranged in the outer shell 2, the outer diameter of the first end of the push rod 4 is larger than the outer diameter of the second end thereof, and the first end of the push rod 4 is supported on the step of the inner wall of the outer shell 2, the rotating cylinder 5 is located at the top of the push rod 4, and the outer wall of the top end of the rotating cylinder 5 is close to the inner wall of the retaining cylinder 7.

[0017] Specifically, multiple positioning components 3 are arranged in an array along the circumference of the shell 2, and the multiple positioning components 3 can be aggregated into the shell 2, or expanded to the outside of the shell 2. The positioning components 3 and the push rod 4 generate an interaction force by means of inclined surface extrusion. When the multiple positioning components 3 are aggregated, an upward force is generated on the push rod 4, prompting the push rod 4 and the rotating cylinder 5 to move upward; when the multiple positioning components 3 are expanded, the push rod 4 and the rotating cylinder 5 will move downward and reset; in the process of the push rod 4 and the rotating cylinder 5 moving upward and downward, the rotating cylinder 5 will be prompted to rotate a preset angle, that is, the rotating cylinder 5 rotates once. This process is similar to the structural principle of pressing the cap of a ballpoint pen to switch the refills of different colors. The specific implementation method is as follows: like Figure 2-Figure 9 As shown, the outer wall of the first end of the push rod 4 is provided with a first gear 41, and the top surface of the first gear 41 forms a circle of first saw teeth 42, one side of the first saw teeth 42 is a vertical surface, and the other side is an inclined surface (see Figure 5 ); The outer wall of the drum 5 is provided with a second gear 51, and the bottom surface of the second gear 51 forms a circle of second saw teeth 52, one side of the second saw teeth 52 is a vertical surface, and the other side is an inclined surface (see Figure 6 ), the first sawtooth 42 and the second sawtooth 52 are connected to each other by an inclined surface, and the first gear 41 and the second gear 51 have the same number of teeth and their positions correspond to each other (see Figure 4 ), the inner wall array of the housing 2 has a circle of limiting teeth 21, and the top surface of the limiting teeth 21 is set as an inclined surface (see Figure 7 ), and the inclined surface of the top surface of the limiting tooth 21 is parallel to the inclined surface of the second sawtooth 52, and the limiting tooth 21 bites the second gear 51 (see Figure 4 , Fig. 9 ), as mentioned above, the first gear 41 and the second gear 51 have the same number of teeth and their positions correspond to each other, so the limit tooth 21 also engages with the first gear 41. When the limit tooth 21 engages with the first gear 41 and the second gear 51, the limit tooth 21 is used to limit the first gear 41 and the second gear 51 from rotating at will. When the rotating drum 5 moves up and breaks away from the restriction of the limit tooth 21, the rotating drum 5 can rotate under the ingenious cooperation of the inclined surface of the first sawtooth 42 and the inclined surface of the limit tooth 21.

[0018] According to the above principle, the method of clamping the bridge plug 1 in the corresponding layer of sliding sleeve is as follows: a circle of clamping grooves is set on the inner wall of each sliding sleeve. During operation, multiple layers of sliding sleeves are lowered into the well in advance, and then the bridge plug 1 is put into the well. It should be noted that after the bridge plug 1 is put into the well, multiple positioning components 3 are in a clustered state; when the bridge plug 1 has not reached the corresponding layer of sliding sleeve, each time the bridge plug 1 passes over the clamping groove of a layer of sliding sleeve downward, the clamping groove will cause the positioning component 3 to expand and cluster once, that is, each time the bridge plug 1 passes over the clamping groove of a layer of sliding sleeve downward, the rotating drum 5 will be caused to rotate once; when the bridge plug 1 reaches the corresponding layer of sliding sleeve, a limit block 22 must be set at a specific position on the inner wall of the shell 2 (see Fig. 9), the limit block 22 is used to limit the drum 5 from disengaging from the limit tooth 21, thereby limiting the push rod 4 from continuously moving upward, so that the positioning assembly 3 can only be stuck in the slot of the corresponding layer of sliding sleeve, the positioning assembly 3 cannot be aggregated, and the bridge plug 1 will not continue to move downward, thereby achieving the purpose of quickly and accurately sticking the bridge plug 1 in the corresponding sliding sleeve.

[0019] Assume that there are 60 layers of sliding sleeves in the well, and the deepest sliding sleeve in the well is the first layer of sliding sleeves. Because a circle is 360°, 60 first gears 41, second gears 51, and limit teeth 21 are set, and the rotating drum 5 rotates 6° each time. When the bridge plug 1 needs to be stuck in the sliding sleeve of the first layer, the rotating drum 5 installed in the corresponding counter can only rotate 59 times. When the bridge plug 1 reaches the first layer, the rotating drum 5 is restricted by the limit block 22 to disengage the limit teeth 21, and the positioning component 3 can only be stuck in the slot of the first layer of sliding sleeves. When the bridge plug 1 needs to be stuck in the sliding sleeve of the 40th layer, the rotating drum 5 installed in the corresponding counter can only rotate 20 times. When the bridge plug 1 reaches the 40th layer, the rotating drum 5 is restricted by the limit block 22 to disengage the limit teeth 21, and the positioning component 3 can only be stuck in the slot of the 40th layer of sliding sleeves.

[0020] like Fig. 9 As shown, it is a structural diagram of the limiting tooth 21 and the second gear 51 exposed after a portion of the outer shell 2 is cut off. The state at this time is that the rotating drum 5 is restricted from disengaging from the limiting tooth 21, and the rotating drum 5 will not rotate. More precisely, a vertical rod 511 is provided on the top of one of the teeth of the second gear 51, and a stop block 25 is provided on the inner wall of the outer shell 2. After the rotating drum 5 rotates a preset number of times, the vertical rod 511 is located below the limiting block 22, and the vertical rod 511 is close to the stop block 25. The stop block 25 is used to further limit the rotation of the rotating drum 5.

[0021] The specific structure of the positioning component 3 is as follows: Figure 2 , Figure 3 , Figure 7 As shown, the outer wall of the shell 2 has a plurality of T-slots 23 in a circular array, and a through slot 24 is provided on the inner side of the T-slot 23. The through slot 24 is connected to the inside of the shell 2. The positioning assembly 3 includes a positioning block 31 and two pressure blocks 32. The positioning block 31 is horizontally slidably arranged in the T-slot 23. The two pressure blocks 32 are respectively arranged at two steps of the T-slot 23 and are fixed to the shell 2 by bolt connection. The pressure blocks 32 extend to the outer wall of the positioning block 31 to prevent the positioning block 31 from escaping from the T-slot 23. The outer wall of the positioning block 31 is provided with a triangular block 311, and the inner wall of the positioning block 31 is provided with an adjusting rod 312. The outer wall of the push rod 4 has a plurality of slots 43 in a circular array, and one slot 43 corresponds to one adjusting rod 312. The end face of the adjusting rod 312 is adapted to the corresponding slot 43 through an inclined surface.

[0022] In summary, the principle of the counter is: when the bridge plug 1 is put into the well, the multiple positioning components 3 are squeezed by the inner wall of the sliding sleeve and are aggregated, thereby prompting the push rod 4 and the rotating drum 5 to move up. As mentioned above, the bottom of the plug rod 6 is supported on the step of the inner wall of the rotating drum 5, so the upward movement of the rotating drum 5 will prompt the plug rod 6, the mounting ring 61 and the main body tube 11 to move up, the spring 12 is compressed, and the rotating drum 5 is subjected to the downward force of the plug rod 6 and the spring 12; after the rotating drum 5 moves up and breaks away from the restriction of the limit tooth 21, because the first serration 42 and the second serration 52 are connected to each other in the form of an inclined surface, the rotating drum 5 is subjected to the downward force of the plug rod 6 and the spring 12, so next the first serration 42 at the top of the push rod 4 squeezes the second serration 52 upward , which will cause the drum 5 to rotate, so that the second sawtooth 52 in the original position rotates to the inclined surface at the top of the adjacent limit tooth 21; the above clearly introduces the effect caused by the aggregation of the positioning components 3, and then when the bridge plug 1 reaches the first sliding sleeve at the wellhead, multiple positioning components 3 will expand into the slot. In this process, the push rod 4 loses the squeezing of the adjusting rod 312, so the push rod 4 and the drum 5 will move downward. When the drum 5 is about to move downward, it will first rotate under the guidance of the inclined surface at the top of the limit tooth 21, so that the second sawtooth 52 moves to the gap between the two adjacent limit teeth 21, and then the drum 5 moves down and resets. Therefore, the positioning components 3 aggregate and expand once, which will cause the drum 5 to complete a complete rotation.

[0023] like Figure 1 , Figure 2 The counter shown in the figure shows that the drum 5 has rotated a preset number of times, and the positioning assembly 3 is stuck in the slot of the corresponding layer of the sliding sleeve. At this time, in order to reduce the force between the insertion rod 6 and the step of the inner wall of the drum 5, the inner wall of the drum 5 is provided with an avoidance groove 53, and the avoidance groove 53 extends upward to the step of the inner wall of the drum 5. Figure 2 In the state, the rotating drum 5 has rotated a preset number of times, and the lower side of the insertion rod 6 is facing the avoidance groove 53.

[0024] Example 2 This embodiment provides a cementing sleeve system, including a sleeve, a bridge plug 1 and the spiral counter described in Example 1.

[0025] The above embodiments are only used to illustrate the technical ideas and features of the present invention, and are not intended to be the only or limit the present invention. It should be understood by those skilled in the art that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention all fall within the scope of protection of the present invention.

Claims

1. A spiral counter, characterized in that: The counter is arranged at the bottom end of the bridge plug (1) and is used to clamp the bridge plug (1) into the sliding sleeve of the corresponding layer. The counter comprises a housing (2), a plurality of positioning components (3) arranged in an array along the circumference of the housing (2), a top rod (4), a rotating drum (5) and an insertion rod (6); The inner wall of the sliding sleeve is provided with a circle of grooves; The main body tube (11) at the center of the bridge plug (1) is downwardly inserted into the outer shell (2), the insertion rod (6) is fixedly arranged at the bottom of the main body tube (11), and the bottom of the insertion rod (6) is supported on a step on the inner wall of the rotating drum (5), the outer diameter of the first end of the push rod (4) is greater than the outer diameter of the second end thereof, and the first end is supported on the step on the inner wall of the outer shell (2), and the rotating drum (5) is located at the top of the push rod (4); When the positioning component (3) moves downward over the slot of a layer of the sliding sleeve, the positioning component (3) will be expanded and then assembled; when the positioning component (3) is assembled, it will press the push rod (4) and the rotating drum (5) upward; when the positioning component (3) is expanded, the push rod (4) and the rotating drum (5) move downward and reset, and the whole process will cause the rotating drum (5) to rotate by a preset angle; when the rotating drum (5) rotates a preset number of times and the positioning component (3) expands to the slot of the corresponding layer of the sliding sleeve, the push rod (4) and the rotating drum (5) are restricted from moving upward by the limit block (22) on the inner wall of the outer shell (2).

2. The spiral counter according to claim 1, characterized in that: The outer wall of the housing (2) has a plurality of T-slots (23) in a circumferential array, the inner side of the T-slots (23) is provided with a through slot (24), the through slot (24) is communicated with the interior of the housing (2), the positioning assembly (3) comprises a positioning block (31) and two pressing blocks (32), the positioning block (31) is horizontally slidably arranged in the T-slot (23), the two pressing blocks (32) are respectively arranged at two steps of the T-slot (23) and fixed by bolts, the pressing blocks (32) extend to the outer wall of the positioning block (31), the outer wall of the positioning block (31) is provided with a triangular block (311), the inner wall is provided with an adjusting rod (312), the outer wall of the push rod (4) has a plurality of slots (43) in a circumferential array, the end face of the adjusting rod (312) is adapted to the corresponding slot (43) through an inclined surface.

3. The spiral counter according to claim 1, characterized in that: A first gear (41) is provided on the outer wall of the first end of the push rod (4), and a circle of first saw teeth (42) is formed on the top surface of the first gear (41); a second gear (51) is provided on the outer wall of the rotating drum (5), and a circle of second saw teeth (52) is formed on the bottom surface of the second gear (51); the first saw teeth (42) and the second saw teeth (52) are connected to each other via an inclined surface; the first gear (41) and the second gear (51) have the same number of teeth and are located in corresponding positions; a circle of limiting teeth (21) is arrayed on the inner wall of the housing (2); the limiting teeth (21) engage the first gear (41) and the second gear (51), and the inclined surface of the top surface of the limiting teeth (21) is parallel to the inclined surface of the second saw teeth (52).

4. The spiral counter according to claim 1, characterized in that: The top end of the outer shell (2) is threadedly connected to a retaining cylinder (7), and the inner wall of the top end of the outer shell (2) is threadedly connected to the outer wall of the bottom end of the retaining cylinder (7). A circular ring (71) is provided on the inner wall of the retaining cylinder (7). The body tube (11) is matched in the circular ring (71). The bottom end outer wall of the body tube (11) is threadedly connected to a mounting ring (61). The outer wall of the mounting ring (61) is tightly attached to the inner wall of the retaining cylinder (7). A spring (12) is provided on the outer periphery of the body tube (11). The two ends of the spring (12) are respectively connected to the circular ring (71) and the mounting ring (61). The insertion rod (6) is fixedly arranged at the bottom of the mounting ring (61).

5. The spiral counter according to claim 4, characterized in that: The outer wall of the top end of the rotating drum (5) is in close contact with the inner wall of the retaining drum (7). The inner wall of the rotating drum (5) is provided with an avoidance groove (53). The avoidance groove (53) extends upward to a step on the inner wall of the rotating drum (5). When the rotating drum (5) rotates a preset number of times, the insertion rod (6) faces the avoidance groove (53).

6. The spiral counter according to claim 1, characterized in that: A vertical rod (511) is provided at the top of one of the teeth of the second gear (51), and a stop block (25) is provided on the inner wall of the housing (2). When the rotating drum (5) rotates a preset number of times, the vertical rod (511) is located below the limit block (22), and the vertical rod (511) is in close contact with the stop block (25).

7. A cementing sleeve system, characterized in that: It comprises a sliding sleeve, a bridge plug (1) and a spiral counter as claimed in any one of claims 1 to 6.

Images