Bridge plug counting and positioning device

Abstract

The utility model discloses a counting and positioning device for a bridge plug, which relates to the technical field of oil and gas well fracturing, is arranged at the bottom end of the bridge plug and is characterized in that the top of a shell is in threaded connection with a retaining cylinder, a circular ring is arranged on the inner wall of the retaining cylinder, a body pipe at the center of the bridge plug downwards penetrates into the circular ring, and the outer wall of the bottom end of the body pipe is in threaded connection with a mounting ring; two ends of the spring are respectively connected with the circular ring and the mounting ring; the top end of the ejector rod is supported on a step on the inner wall of the shell, and the rotating cylinder is located on the top of the ejector rod. The multiple positioning assemblies are arrayed along the circumference of the shell, and when being extruded, the positioning assemblies can be gathered into the shell, so that the ejector rod is promoted to move upwards, and the rotating drum rotates by a preset angle; a limiting block is arranged at the preset position of the inner wall of the shell and used for limiting rotation of the rotary drum when the rotary drum rotates for preset times, and then upward movement of the ejector rod is limited. According to the scheme, the bridge plug can be quickly and accurately clamped in the sliding sleeve of the corresponding layer, and no cable is needed.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well fracturing technology, and in particular to a bridge plug counter and locator. Background Technology

[0002] CN113605859A discloses a cementing sleeve system and its usage method. The method involves placing a soluble bridge plug into the wellbore. The steps are as follows: the toe sleeve and the cementing sleeve are lowered into the wellbore to the designed depth according to operational requirements; after cementing, the toe sleeve is opened and fracturing is performed; after fracturing, the soluble bridge plug is placed into the first layer of cementing sleeves. When the soluble bridge plug reaches the position of the first layer of cementing sleeves, it is lowered an additional 20-40 meters, and the cementing sleeve is pulled back. The weight suspended during the pullback is measured. If there is an over-pulling reaction when the soluble bridge plug approaches the position of the first layer of cementing sleeves, the over-pulling is stopped within 0.5T of weight over-pulling, and the depth is corrected; after confirming the depth is correct, the soluble bridge plug is ignited and set, and the setting tool and cable are removed.

[0003] The CN113605859A scheme has the following problems: the method is relatively cumbersome and time-consuming, and it cannot quickly and accurately place the soluble bridge plug into the sliding sleeve of a specific layer; placing the soluble bridge plug requires the use of a cable, and cables are prone to accidents in the well. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a bridge plug counter and positioner that can hold bridge plugs in the corresponding layer's sliding sleeve without the need for cables.

[0005] In order to achieve the purpose of this utility model, the following solution is proposed:

[0006] A bridge plug counter and positioner, located at the bottom end of the bridge plug, includes a housing, a plurality of positioning components arranged in a circumferential array along the housing, a push rod, a rotating cylinder, and a plug rod.

[0007] The top of the outer shell is threaded with a baffle, the inner wall of the baffle is provided with a ring, the main body tube at the center of the bridge plug passes downward through the ring, the bottom end of the main body tube is threaded with a mounting ring, the two ends of the spring are respectively connected to the ring and the mounting ring, and the insertion rod is fixed at the bottom of the mounting ring.

[0008] The top of the push rod is supported on the step on the inner wall of the outer casing, the rotating cylinder is located at the top of the push rod, and the bottom of the insert rod is supported on the step on the inner wall of the rotating cylinder;

[0009] The outer wall of the top rod top end is provided with a first gear, and the top surface of the first gear forms a circle of first sawteeth; the outer wall of the rotating drum is provided with a second gear, and the bottom surface of the second gear forms a circle of second sawteeth, the first sawteeth and the second sawteeth are connected by a bevel surface, the number of teeth of the first gear and the second gear is the same, and the positions correspond to each other, and the inner wall of the shell is arrayed with a circle of limiting teeth, the limiting teeth engage the first gear and the second gear, and the bevel surface of the top surface of the limiting teeth is parallel to the bevel surface of the second sawteeth;

[0010] When the positioning assembly is extruded, it can be aggregated into the shell, and then the top rod is moved upward by the extrusion of the bevel surface, so that the rotating drum rotates by a preset angle; the limiting block is arranged at the preset position of the inner wall of the shell, and the limiting block is used to limit the rotation of the rotating drum, thereby limiting the upward movement of the top rod.

[0011] The positioning assembly, the top rod, the rotating drum and the plug rod are clever in structure, the positioning assembly is aggregated once and expanded once, the rotating drum can be rotated by a preset angle, and then the number of times that the rotating drum can be rotated is preset, so that the positioning assembly can only be expanded in the slip sleeve of the corresponding layer, and the positioning assembly can no longer be aggregated, in this way, the bridge plug can be quickly and accurately clamped in the slip sleeve of the corresponding layer, and the risk of accidents is reduced without the help of a cable. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 A schematic view showing that the bridge plug counting and the positioner are clamped in the slip sleeve of the corresponding layer is shown;

[0013] Figure 2 A cross-sectional view of the bridge plug counting and the positioner is shown;

[0014] Figure 3 For Figure 2 A local enlarged view at A in FIG.

[0015] Figure 4 An external structure diagram of the first gear and the second gear is shown;

[0016] Figure 5 A structure diagram of the top rod is shown;

[0017] Figure 6 A structure diagram of the rotating drum is shown;

[0018] Figure 7 A cross-sectional view of the shell is shown;

[0019] Figure 8 A structure diagram of the limiting teeth and the second gear after the cut-off part of the shell is shown;

[0020] Figure 9 Figure 8 A local enlarged view at B in FIG. DETAILED DESCRIPTION

[0021] As Figure 1 , Figure 2 shown, the embodiment provides a bridge plug counting and positioning device, which is arranged at the bottom end of the bridge plug 1 and used for clamping the bridge plug 1 in the sliding sleeve of the corresponding layer. The counter comprises a shell 2, a plurality of positioning components 3, a top rod 4, a rotating drum 5 and a plug rod 6.

[0022] It is pointed out here that the core innovation point of the embodiment is the counter, so the structure of the sliding sleeve and the bridge plug 1 is not specifically shown in the drawings. The structure of the sliding sleeve of the embodiment can be referred to the well cementing sliding sleeve system recorded in CN113605859A, and the structure of the bridge plug 1 can be referred to the soluble bridge plug recorded in CN2024230215815.

[0023] Specifically, the body tube 11 at the center of the bridge plug 1 is downwardly arranged in the shell 2. More accurately, the top end of the shell 2 is threadedly connected with a blocking cylinder 7, and the inner wall at the top end of the shell 2 is threadedly connected with the outer wall at the bottom end of the blocking cylinder 7. The inner wall of the blocking cylinder 7 is provided with a circular ring 71, and the body tube 11 is matched in the circular ring 71. The plug rod 6 is fixedly arranged at the bottom of the body tube 11. More accurately, the outer wall at the bottom end of the body tube 11 is threadedly connected with a mounting ring 61, the outer wall of the mounting ring 61 is tightly attached to the inner wall of the blocking cylinder 7, the plug rod 6 is fixedly arranged at the bottom of the mounting ring 61, and the bottom of the plug rod 6 is supported on the step of the inner wall of the rotating drum 5. The outer periphery of the body tube 11 is provided with a spring 12, and the top end and the bottom end of the spring 12 are respectively connected with the circular ring 71 and the mounting ring 61. The top rod 4 and the rotating drum 5 are both arranged in the shell 2. The outer diameter of the top end of the top rod 4 is larger than that of the bottom end, and the top end of the top rod 4 is supported on the step of the inner wall of the shell 2. The rotating drum 5 is located at the top of the top rod 4, and the outer wall at the top end of the rotating drum 5 is tightly attached to the inner wall of the blocking cylinder 7.

[0024] Specifically, the plurality of positioning components 3 are arranged in an array along the circumference of the shell 2, and the plurality of positioning components 3 can be aggregated into the shell 2 or expanded out of the shell 2. The positioning components 3 and the top rod 4 interact with each other through the way of being extruded by the inclined surface. When the plurality of positioning components 3 are aggregated, an upward force is generated on the top rod 4, which promotes the upward movement of the top rod 4 and the rotating drum 5. When the plurality of positioning components 3 are expanded, the top rod 4 and the rotating drum 5 will move downward to reset. During the upward and downward movement of the top rod 4 and the rotating drum 5, the rotating drum 5 will rotate by a preset angle, i.e. the rotating drum 5 rotates once. This process is similar to the structure principle of pressing the cap of a ballpoint pen to switch different color refills, and the specific implementation manner is as follows:

[0025] As Figures 2-9 shown, the outer wall at the top end of the top rod 4 is provided with a first gear 41, and a circle of first sawteeth 42 is formed on the top surface of the first gear 41. One side of the first sawteeth 42 is a vertical surface, and the other side is an inclined surface (see Figure 5 ). The outer wall of the rotating drum 5 is provided with a second gear 51, and a circle of second sawteeth 52 is formed on the bottom surface of the second gear 51. One side of the second sawteeth 52 is a vertical surface, and the other side is an inclined surface (seeFigure 6 ), the first sawtooth 42 and the second sawtooth 52 are connected by way of a slope, and the first gear 41 and the second gear 51 have the same number of teeth and are in position corresponding to each other (see Figure 4 ), the outer shell 2 has a ring of limiting teeth 21 on the inner wall, and the top surface of the limiting teeth 21 is set as a slope (see Figure 7 ), and the slope of the top surface of the limiting teeth 21 is parallel to the slope of the second sawtooth 52, and the limiting teeth 21 engage the second gear 51 (see Figure 4 、 Figure 9 ), As mentioned above, the first gear 41 and the second gear 51 have the same number of teeth and are in position corresponding to each other, so the limiting teeth 21 also engage the first gear 41, and when the limiting teeth 21 engage the first gear 41 and the second gear 51, the limiting teeth 21 are used to limit the random rotation of the first gear 41 and the second gear 51, and when the rotating drum 5 moves up and is out of the limitation of the limiting teeth 21, the rotating drum 5 can rotate under the clever cooperation of the slope of the first sawtooth 42 and the slope of the limiting teeth 21.

[0026] According to the above principle, the method of clamping the bridge plug 1 in the sliding sleeve of the corresponding layer is as follows: a ring of clamping grooves is arranged on the inner wall of each sliding sleeve, during operation, a plurality of sliding sleeves are lowered in the well in advance, and then the bridge plug 1 is put into the well, and it is noted that after the bridge plug 1 is put into the well, the plurality of positioning assemblies 3 are in the aggregated state; when the bridge plug 1 has not reached the sliding sleeve of the corresponding layer, the clamping groove of each layer of sliding sleeve will promote the positioning assembly 3 to expand once and aggregate once as the bridge plug 1 passes through the clamping groove of each layer of sliding sleeve downward, that is, the rotating drum 5 will rotate once as the bridge plug 1 passes through the clamping groove of each layer of sliding sleeve downward; when the bridge plug 1 reaches the sliding sleeve of the corresponding layer, a limiting block 22 must be arranged at a specific position on the inner wall of the outer shell 2 (see Figure 9 ), which is used to limit the rotating drum 5 from being out of the limiting teeth 21, and further limit the top rod 4 from continuously moving up, so that the positioning assembly 3 can only be clamped in the clamping groove of the sliding sleeve of the corresponding layer, the positioning assembly 3 cannot aggregate, and the bridge plug 1 will not continue to move downward, thereby achieving the purpose of quickly and accurately clamping the bridge plug 1 in the corresponding sliding sleeve.

[0027] Suppose there are 60 layers of sliding sleeves in the well, and the deepest sliding sleeve in the well is the first layer of sliding sleeve, because there are 360° in a circle, so the first gear 41, the second gear 51 and the limiting teeth 21 are all arranged 60, and the rotating drum 5 rotates 6° each time. When the bridge plug 1 needs to be clamped in the first layer of sliding sleeve, the corresponding rotating drum 5 installed in the counter can only rotate 59 times, and when the bridge plug 1 reaches the first layer, the rotating drum 5 is limited by the limiting block 22 to be out of the limiting teeth 21, and the positioning assembly 3 can only be clamped in the clamping groove of the first layer of sliding sleeve. When the bridge plug 1 needs to be clamped in the 40th layer of sliding sleeve, the corresponding rotating drum 5 installed in the counter can only rotate 20 times, and when the bridge plug 1 reaches the 40th layer, the rotating drum 5 is limited by the limiting block 22 to be out of the limiting teeth 21, and the positioning assembly 3 can only be clamped in the clamping groove of the 40th layer of sliding sleeve.

[0028] As Figure 9 shown is the structure diagram of the limiting tooth 21 and the second gear 51 exposed after the shell 2 is cut off, at this time the state is that the rotating drum 5 is limited to be separated from the limiting tooth 21, the rotating drum 5 will not rotate, more accurately, the top of one of the teeth of the second gear 51 is provided with a vertical rod 511, the inner wall of the shell 2 is provided with a stopping block 25, 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 abuts against the stopping block 25, the stopping block 25 is used to further limit the rotation of the rotating drum 5.

[0029] The specific structure of the positioning assembly 3 is as follows: as Figure 2 , Figure 3 , Figure 7 shown, the outer wall of the shell 2 is circumferentially arrayed with a plurality of T-shaped grooves 23, the inner side of the T-shaped groove 23 is provided with a through groove 24, the through groove 24 is in communication with the inside of the shell 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-shaped groove 23, the two pressing blocks 32 are respectively arranged at two steps of the T-shaped groove 23 and are fixed to the shell 2 through bolt connection, the pressing block 32 extends to the outer wall of the positioning block 31 and is used to prevent the positioning block 31 from being separated from the T-shaped groove 23, the outer wall of the positioning block 31 is provided with a triangular block 311, the inner wall of the positioning block 31 is provided with an adjusting rod 312, the outer wall of the top rod 4 is circumferentially arrayed with a plurality of insertion grooves 43, one insertion groove 43 corresponds to one adjusting rod 312, and the end face of the adjusting rod 312 and the corresponding insertion groove 43 are adapted through a bevel.

[0030] In summary, the principle of the counter is that when the bridge plug 1 is put into the well, the plurality of positioning assemblies 3 are aggregated by the extrusion of the inner wall of the sliding sleeve, thereby promoting the upward movement of the jacks 4 and the rotating drum 5. As mentioned above, the bottom of the insertion rod 6 is supported on the step of the inner wall of the rotating drum 5, so that the upward movement of the rotating drum 5 promotes the upward movement of the insertion rod 6, the mounting ring 61 and the body pipe 11, and the spring 12 is compressed, and the rotating drum 5 is subjected to the downward force of the insertion rod 6 and the spring 12; after the rotating drum 5 moves upward and is released from the limitation of the limiting teeth 21, because the first sawtooth 42 and the second sawtooth 52 are relatively connected by a beveled surface, the rotating drum 5 is subjected to the downward force of the insertion rod 6 and the spring 12, so that the first sawtooth 42 at the top of the jack 4 extrudes the second sawtooth 52 upward, which promotes the rotation of the rotating drum 5, so that the second sawtooth 52 at the original position is rotated to the beveled surface at the top of the adjacent limiting tooth 21; the above clearly introduces the effect caused by the aggregation of the positioning assembly 3, and then when the bridge plug 1 reaches the first sliding sleeve at the wellhead, the plurality of positioning assemblies 3 will be expanded into the clamping groove, in this process, the jack 4 loses the extrusion of the adjusting rod 312, so that the jack 4 and the rotating drum 5 move downward, and the rotating drum 5 will rotate under the guidance of the beveled surface at the top of the limiting tooth 21 before moving downward, so that the second sawtooth 52 moves to the gap between the adjacent two limiting teeth 21, and then the rotating drum 5 moves downward to reset, so that the aggregation and expansion of the positioning assembly 3 once promotes the complete rotation of the rotating drum 5 once.

[0031] As Figure 1 , Figure 2 the counter shown in the middle, at this time, the rotating drum 5 has rotated a predetermined number of times, and the positioning assembly 3 is clamped in the clamping groove of the corresponding layer 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 rotating drum 5, the inner wall of the rotating drum 5 is provided with an avoiding groove 53, and the avoiding groove 53 extends upward to the step of the inner wall of the rotating drum 5, in Figure 2 the state, at this time, the rotating drum 5 has rotated a predetermined number of times, and the insertion rod 6 is opposite to the avoiding groove 53 below.

[0032] The above embodiments are only used to illustrate the technical ideas and characteristics of the utility model, and do not represent the only or limit the utility model. Those skilled in the art should understand that various changes or equivalent replacements made to the utility model without departing from the scope of the utility model all belong to the scope of protection of the utility model.

Claims

1. A bridge plug count and locator, characterized by, The bridge plug (1) is provided with an outer shell (2), a plurality of positioning assemblies (3) arranged along the circumference of the outer shell (2), a top rod (4), a rotating drum (5) and a plug rod (6); The top of the outer shell (2) is threadedly connected with a blocking drum (7), the inner wall of the blocking drum (7) is provided with a circular ring (71), the body pipe (11) at the center of the bridge plug (1) is downwardly arranged in the circular ring (71), the outer wall of the bottom end of the body pipe (11) is threadedly connected with a mounting ring (61), the two ends of a spring (12) are respectively connected with the circular ring (71) and the mounting ring (61), and the plug rod (6) is fixedly arranged at the bottom of the mounting ring (61). The top end of the top rod (4) is supported on the step of the inner wall of the outer shell (2), the rotating drum (5) is located at the top of the top rod (4), and the bottom of the plug rod (6) is supported on the step of the inner wall of the rotating drum (5). The outer wall of the top end of the top rod (4) is provided with a first gear (41), and a first sawtooth (42) is formed on the top surface of the first gear (41); the outer wall of the rotating drum (5) is provided with a second gear (51), and a second sawtooth (52) is formed on the bottom surface of the second gear (51), the first sawtooth (42) and the second sawtooth (52) are oppositely connected through inclined surfaces, the number of teeth of the first gear (41) and the second gear (51) is the same, and the positions of the first gear (41) and the second gear (51) correspond to each other, the inner wall of the outer shell (2) is arranged with a limiting tooth (21), the limiting tooth (21) engages the first gear (41) and the second gear (51), and the inclined surface of the top surface of the limiting tooth (21) is parallel to the inclined surface of the second sawtooth (52). When the positioning assembly (3) is extruded, it can be aggregated into the outer shell (2), and then the top rod (4) is moved upward through the inclined surface extrusion, so that the rotating drum (5) is rotated by a preset angle; the inner wall of the outer shell (2) is provided with a limiting block (22) at a preset position, the limiting block (22) is used for limiting the rotation of the rotating drum (5) when the rotating drum (5) is rotated by a preset number of times, thereby limiting the upward movement of the top rod (4).

2. The bridge plug count and positioner of claim 1, wherein, The outer wall of the outer shell (2) is circumferentially arranged with a plurality of T-shaped grooves (23), the inner side of the T-shaped groove (23) is provided with a through groove (24), the through groove (24) is communicated with the inside of the outer shell (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-shaped groove (23), the two pressing blocks (32) are respectively arranged at the two steps of the T-shaped groove (23) and are fixed through bolts, the pressing block (32) extends to the outer wall of the positioning block (31), the outer wall of the positioning block (31) is provided with a triangular block (311), and the inner wall is provided with an adjusting rod (312), the outer wall of the top rod (4) is circumferentially arranged with a plurality of insertion grooves (43), and the end surface of the adjusting rod (312) is adapted to the corresponding insertion groove (43) through an inclined surface.

3. The bridge plug count and positioner of claim 1, wherein, The inner wall of the outer shell (2) is threadedly connected with the outer wall of the bottom end of the blocking drum (7), the outer wall of the body pipe (11) is tightly attached to the inner wall of the circular ring (71), the outer wall of the mounting ring (61) is tightly attached to the inner wall of the blocking drum (7), and the top end of the rotating drum (5) is tightly attached to the inner wall of the blocking drum (7).

4. The bridge plug count and positioner of claim 1, wherein, The inner wall of the rotating drum (5) is provided with an avoiding groove (53), the avoiding groove (53) extends upward to the step of the inner wall of the rotating drum (5), and the plug rod (6) is opposite to the avoiding groove (53) when the rotating drum (5) is rotated by a preset number of times.

5. The bridge plug count and positioner of claim 1, wherein, One of the teeth of the second gear (51) is provided with a vertical rod (511), and the inner wall of the shell (2) is provided with a stopping block (25). When 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 in close contact with the stopping block (25).

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