Soluble bridge plug, plugging device, plugging equipment and oil well pump installation method

Abstract

The invention relates to the technical field of oil well pump installation, in particular to a soluble bridge plug, a plugging device, plugging equipment and an oil well pump installation method. Wherein the moving part is used for being fixedly connected with a setting device, the moving part is provided with a fracture structure capable of being fractured in the radial direction, the plugging part is clamped and plugged on the axial outer side of the tail end of the central pipe, and a clamping and plugging mechanism is annularly arranged on the outer side of the central pipe in the circumferential direction and used for being movably connected with the setting device; based on first thrust applied to the clamping and blocking mechanism by the setting device from the head end of the central pipe to the tail end of the central pipe, the clamping and blocking mechanism can be clamped and blocked between the central pipe and the oil well casing after radial outward deformation; the moving part can be fractured at the fracture structure based on a first pulling force applied by the setting device to the moving part in the direction from the head end of the central pipe to the tail end of the central pipe, so that the setting device is disconnected from the blocking mechanism; the value of the first pulling force is greater than that of the first pushing force. The soluble bridge plug can shorten the installation period of the oil well pump.

Description

Technical Field

[0001] The invention relates to the technical field of oil well pump installation, and in particular to a soluble bridge plug, a plugging device, a plugging equipment and an oil well pump installation method. Background Art

[0002] After the oil well is fracturing, the oil well is filled with pressurized fracturing fluid. At this time, there are three main ways to install the oil well pump. The first is to install the oil well pump directly in the pressurized oil well after fracturing. The second is to release the fracturing fluid in the oil well to release the pressure to the wellhead pressure of 0MPa after fracturing, and then the minor repair team will install the oil well pump. The third is to use mud or solid-free well killing fluid to circulate the well after fracturing, and then use the minor repair team to install the oil well pump. However, the installation and construction period of installing the oil well pump in these three traditional methods is relatively long. Summary of the invention

[0003] The purpose of the invention is to overcome the problem of long installation period of oil well pump after oil well fracturing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a soluble bridge plug on one hand, which includes a center tube and a release component, and the release component includes a movable part and a sealing part connected to each other, the movable part is arranged in the center tube, the movable part is used to be fixedly connected with a sealing device, the movable part is provided with a fracture structure that can fracture radially, the sealing part is clamped and sealed on the axial outer side of the end of the center tube, and a clamping mechanism is arranged on the outer circumferential ring of the center tube, and the clamping mechanism is used to be movably connected with the sealing device; based on a first thrust applied by the sealing device to the clamping mechanism in a direction from the head end of the center tube to its end, the clamping mechanism can be clamped and sealed between the center tube and the oil well casing after radial deformation; based on a first pulling force applied by the sealing device to the movable part in a direction from the head end of the center tube to its end, the movable part can be broken at the fracture structure to disconnect the sealing device from the clamping mechanism; the value of the first pulling force is greater than the value of the first thrust.

[0005] In some embodiments, the blocking mechanism includes a first retaining ring, an elastic sleeve, a second retaining ring and a first cava structure, the first retaining ring and the second retaining ring are circumferentially fixedly sleeved on the outside of the center tube, and the elastic sleeve is circumferentially movably sleeved on the outside of the center tube; the first cava structure includes a first guide component, a first sleeve, a push ring and a plurality of first cava; the first guide component and the push ring are sleeved on the outside of the center tube, the push ring is located between the first guide component and the first retaining ring, the push ring is connected to the center tube by a radially extending first sealing pin, the first guide component is configured to be able to move along the center tube toward the elastic sleeve, and the radial outer side surface of the first guide component facing one end of the push ring has a first guide surface; along the direction from the push ring to the elastic sleeve, the first guide surface extends radially outward from its end facing the first retaining ring to its end facing the elastic sleeve; all first blocking components are The shoes are arranged circumferentially and surround the outer circumference of the center pipe, the first slip is located between the push ring and the first guide component, and the first slip is configured to be able to move along the radial outer side surface of the center pipe and the first guide surface toward the elastic sleeve; the first sleeve is sleeved on the outer circumference of all the first slips to press the first slips against the radial outer side surface of the center pipe; wherein, based on the first thrust from the first retaining ring to the second retaining ring applied by the sealing device to the push ring, the first sealing pin can be sheared in its radial direction, so that the first slip can radially open the constraint of the first sleeve under the push of the push ring, and further enable the first slip to be clamped between the center pipe and the oil well casing after being stacked with the first guide component along the radial direction of the center pipe; the elastic sleeve is squeezed by the first guide component and the second retaining ring to bulge radially outward and can be clamped and sealed between the center pipe and the oil well casing.

[0006] In some embodiments, the blocking mechanism includes a second cava structure, which includes a second guide component, a second ring and a plurality of second cava; the second guide component is movably sleeved on the outside of the central tube, and the radial outer side surface of the second guide component facing the second retaining ring end has a second guide surface; along the direction from the elastic sleeve to the second retaining ring, the second guide surface extends radially inwardly from the end thereof facing the elastic sleeve to the end thereof facing the second retaining ring; all second cava are circumferentially arranged and surround the outer circumference of the central tube, the second cava is located between the second retaining ring and the second guide component, and the second guide component is configured to be able to move along the central tube toward the second retaining ring movement; the second ring is sleeved on the outer circumference of all the second slips to press the second slips against the radial outer surface of the center pipe; wherein, based on the first thrust from the first retaining ring to the second retaining ring applied by the sealing device to the push ring structure, the elastic sleeve and the second guide component push the second slip to move along the second guide surface, so that the second slip radially opens the constraint of the second ring outward, and further the second slip is clamped between the center pipe and the oil well casing after being radially stacked with the second guide component along the center pipe; the elastic sleeve is squeezed by the first guide component and the second guide component to bulge radially outward and can be sealed between the center pipe and the oil well casing.

[0007] In some embodiments, the diameter of the sealing part is consistent with the outer diameter of the center tube; the second retaining ring has a connecting part and an extending part that are connected to each other, the connecting part and the extending part circumferentially surround the center tube, the radial inner side surface of the connecting part is threadedly connected to the radial outer side surface of the center tube, the radial inner side surface of the extending part is fitted with the radial outer side surface of the sealing part, and the extending part and the sealing part are connected by a radially extending shear pin; based on the second thrust from the moving part to the sealing part, the shear pin breaks and the release component is disconnected from the center tube.

[0008] The present invention also provides a plugging device, which comprises a setting device and the above-mentioned soluble bridge plug.

[0009] In some embodiments, the sealing device includes a lifting mechanism, which is connected to the head end of the moving part through the head end of the central tube, the sealing part is connected to the end of the moving part, and the fracture structure is located between the head end of the moving part and the end of the moving part. The lifting mechanism can apply a first pulling force to the moving part in a direction from the end of the moving part to its head end.

[0010] In some embodiments, the sealing device further includes a pushing mechanism, which is movably sleeved on the radially outer side of the first retaining ring, and the push ring is located between the pushing mechanism and the first cava structure; the pushing mechanism can apply a first thrust to the push ring in the direction from the first retaining ring to the second retaining ring.

[0011] In some embodiments, the pulling mechanism includes a first connecting tube, a first joint, a second connecting tube and a second joint; the radial inner side surface of the end of the first connecting tube is threadedly connected to the radial outer side surface of the head end of the connecting part, and the radial inner side surface of the head end of the first connecting tube is threadedly connected to the radial outer side surface of the end of the first joint; the head end of the first joint is provided with a first connecting groove recessed toward its end, and the radial side wall surface of the first connecting groove is threadedly connected to the radial outer side surface of the end of the second connecting tube; the second joint is provided with a liquid inlet channel extending axially along the center tube, the radial side wall surface of the end of the liquid inlet channel is threadedly connected to the radial outer side surface of the head end of the second connecting tube, and the head end of the liquid inlet channel is used to connect to the injection pipeline; the pushing mechanism includes a glove throwing sleeve, a piston component and a piston sleeve; the end of the glove throwing sleeve is movably sleeved on the outside of the first baffle ring, the glove throwing sleeve is movably sleeved on the outside of the first connecting tube and the first joint, the piston component is movably sleeved on the outside of the second connecting tube, and the head of the glove throwing sleeve The radial inner side of the end is threadedly connected with the radial outer side of the end of the piston component, the piston sleeve is sleeved on the outside of the second joint, the head end of the piston sleeve is connected to the second joint through a radially extending second sealing pin, and the radial inner side of the end of the piston sleeve is threadedly connected with the radial outer side of the piston component; wherein a driving chamber is provided between the piston component and the second joint, and a liquid inlet hole connected to the driving chamber is provided on the side wall of the second connecting pipe; the pressure liquid entering the driving chamber from the liquid inlet channel and the liquid inlet hole in turn can apply a pressure from the end of the second joint to its head end to the second joint, so that the second joint can apply a first pulling force to the moving part; the pressure liquid entering the driving chamber from the liquid inlet channel and the liquid inlet hole in turn can apply a pressure from the head end to the end of the piston component to the piston component, so that the piston component can apply a first thrust to the push ring and a second pulling force to the second sealing pin that can cut the second sealing pin; the value of the second pulling force is smaller than the value of the first thrust.

[0012] In some embodiments, the plugging device further includes a centralizer, and the radial outer side surface of the end of the centralizer is threadedly connected to the radial side wall surface of the head end of the liquid inlet channel.

[0013] The present invention also provides a plugging device, which includes a pressurizing device, an injection tube and the above-mentioned plugging device. The pressurizing device injects pressurized liquid into the liquid inlet channel through the injection tube so that the pressurized liquid enters the driving chamber to apply pressure to the second joint and the piston component.

[0014] The present invention also provides an oil well pump installation method, which adopts the above-mentioned plugging device and includes the following steps: S1, placing the plugging device above the perforation section in the oil well casing, injecting pressure liquid into the driving chamber through the injection pipe using a pressurizing device located on the ground, and pressurizing the pressure liquid using the pressurizing device; S2, increasing the pressure value of the pressure liquid to a value greater than or equal to the first pressure value and less than the second pressure value, so that the second setting pin is sheared by the second tension applied by the piston sleeve; S3, increasing the pressure value of the pressure liquid to a value greater than or equal to the second pressure value The pressure value is greater than the third pressure value, so that the first sealing pin is sheared by the first thrust applied by the glove sleeve, and the blocking mechanism is further connected and sealed between the oil well casing and the central pipe; S4, the pressure value of the pressure liquid is increased to be greater than the third pressure value, so that the first connecting pipe breaks the moving part at the fracture structure with the first pulling force, and the sealing device is further disconnected from the soluble bridge plug; S5, the sealing device and the injection pipe are removed from the oil well casing, and then the fracturing fluid between the soluble bridge plug and the wellhead of the oil well casing is depressurized to 0MPa, and then an oil well pump is installed in the oil well casing.

[0015] In some embodiments, step S3 further includes: after the pressure value of the pressure liquid increases to a value greater than or equal to the second pressure value and less than the fourth pressure value, the pressure is stabilized within a first preset time period; when the blocking mechanism is connected and sealed between the oil well casing and the center pipe, the pressure value of the pressure liquid is increased to a value greater than or equal to the fourth pressure value and less than the third pressure value, and the pressure is stabilized within a second preset time period.

[0016] In some embodiments, step S5 is followed by the following step: S6, injecting a pressure liquid of a fifth pressure value into the oil well casing through a booster device, and the pressure liquid applies a second thrust to the sealing part in a direction from the fracture structure to the sealing part, so that the shear pin is sheared off, and further causes the release component to be disconnected from the center pipe and fall.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] When the soluble bridge plug is installed in the oil well casing, the sealing device applies a first thrust from the head end of the center pipe to the tail end of the center pipe to the plugging mechanism, and the plugging mechanism produces a radial outward deformation along the center pipe, so that the plugging mechanism can be clamped and sealed between the center pipe and the wall of the oil well casing, and the soluble bridge plug is further fixed at a certain position of the oil well casing; then the sealing device applies a first pulling force from the tail end of the center pipe to the head end of the center pipe to the moving part, and the moving part can be broken at the fracture structure, so that the sealing device and the soluble bridge plug are disconnected, and the sealing part is clamped and sealed at the tail end of the center pipe, so that the center pipe is in a blocked state. At this time, the soluble bridge plug can be individually clamped and sealed at a certain position of the oil well casing, and the fracturing fluid below the soluble bridge plug is sealed between the soluble bridge plug and the bottom of the oil well, while the fracturing fluid between the soluble bridge plug and the wellhead can be depressurized to 0MPa in a relatively short time, and after the depressurization is completed, the on-site operation team can install the oil well pump in the oil well casing. Therefore, the soluble bridge plug can be clamped at a preset position in the oil well casing, so that the fracturing fluid in the oil well casing is separated at the soluble bridge plug. The oil well pump can be installed after the fracturing fluid between the soluble bridge plug and the inlet of the oil well casing is depressurized to 0MPa, without depressurizing all the fracturing fluid in the oil well casing to 0MPa. Therefore, the soluble bridge plug can shorten the installation cycle of the oil well pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic half-section diagram of a blocking device in one embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the middle A part;

[0021] Figure 3 yes Figure 1 A partial enlarged schematic diagram of part B in the middle.

[0022] Description of Reference Numerals

[0023] 1. Soluble bridge plug; 11. Central pipe; 12. Hand release component; 121. Moving part; 1211. Fracture structure; 122. Blocking part; 13. Blocking mechanism; 131. First retaining ring; 132. Elastic sleeve; 133. Second retaining ring; 1331. Shear pin; 134. Push ring; 135. First setting pin; 136. First slip; 1361. First sleeve ring; 137. First guide component; 1371. First guide surface; 138. Second guide component; 1 381. Second guide surface; 139. Second cava; 1391. Second sleeve ring; 2. Sealing device; 21. First connecting pipe; 22. First joint; 23. Second connecting pipe; 231. Liquid inlet hole; 24. Second joint; 241. Liquid inlet channel; 25. Glove sleeve; 251. Pressure relief chamber; 252. Pressure relief hole; 26. Piston component; 261. Drive chamber; 27. Piston sleeve; 271. Second sealing pin; 3. Centralizer; 31. Liquid channel; 4. Liquid injection pipe. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention, rather than to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0025] It should be noted that after the oil well is fracturing, an oil well pump needs to be installed in the oil well casing to put it into production. However, before the oil well pump is installed, the oil well casing is in a sealed state and filled with pressurized fracturing fluid. The technical solution of the present invention is proposed under this background environment.

[0026] like Figure 1 to Figure 2As shown, on one hand, the present invention provides a soluble bridge plug, which includes a center tube 11 and a release component 12, the release component 12 includes a movable portion 121 and a sealing portion 122 connected to each other, the movable portion 121 is arranged in the center tube 11, the movable portion 121 is used to be fixedly connected to a sealing device, the movable portion 121 is provided with a fracture structure 1211 that can fracture radially, the sealing portion 122 is clamped and sealed on the axial outer side of the end of the center tube 11, and a clamping mechanism 13 is arranged circumferentially on the outer side of the center tube 11, and the clamping mechanism 13 is used to be movably connected to the sealing device. Based on the first thrust applied by the sealing device to the blocking mechanism 13 in the direction from the head end of the center pipe 11 to its tail end, the blocking mechanism 13 can be clamped and sealed between the center pipe 11 and the oil well casing after radially deforming outward; based on the first pulling force applied by the sealing device to the movable part 121 in the direction from the head end of the center pipe 11 to its tail end, the movable part 121 can be broken at the breaking structure 1211 to disconnect the sealing device from the blocking mechanism 13; the value of the first pulling force is greater than the value of the first thrust.

[0027] Specifically, the center tube 11 is preferably a straightly extending pipe, the head end of the center tube 11 is an end facing the setting device, and the tail end of the center tube 11 is an end facing away from the setting device. The side of the release component 12 facing the head end of the center tube 11 is the moving part 121, and the side of the release part facing the tail end of the center tube 11 is the plugging part 122. In the radial direction of the center tube 11, there is a gap between the inner side surface of the side wall of the center tube 11 and the outer side surface of the moving part 121, or the diameter of the moving part 121 is smaller than the inner diameter of the center tube 11, so after the fracture structure 1211 is fractured, a part of the moving part 121 connected to the setting device can leave the center tube 11 with the setting device. The fracture structure 1211 can be set as a fracture groove that is recessed from the radial outer side of the moving part 121 to the inside of the moving part 121, and the moving part 121 has a smaller strength at the location of the fracture groove and is easily torn. The fracture structure 1211 can also be configured as a plurality of perforations that penetrate the movable portion 121 in the radial direction of the central tube 11. The movable portion 121 has a relatively small strength at the location of the perforations and is easily torn apart. Of course, the fracture structure 1211 can also be in other forms, which are not limited by the present invention. The blocking portion 122 blocks and clamps the axial outer side of the end of the central tube 11, so that the central tube 11 is in a blocked state. So from another perspective, the movable portion 121 is fixedly connected to the central tube 11 through the blocking portion 122, and the movable portion 121 itself does not need to be fixedly connected to the central tube 11 to ensure that the movable portion 121 can be smoothly detached from the central tube 11 during use.

[0028] In this embodiment, when the soluble bridge plug 1 is installed in the oil well casing, the sealing device applies a first thrust from the head end of the center pipe 11 to the end end of the center pipe 11 to the plugging mechanism 13, and the plugging mechanism 13 produces a radial outward deformation along the center pipe 11, so that the plugging mechanism 13 can be clamped and sealed between the center pipe 11 and the wall of the oil well casing, further fixing the soluble bridge plug 1 at a certain position of the oil well casing; then the sealing device applies a first pulling force from the end end of the center pipe 11 to the head end of the center pipe 11 to the moving part 121, and the moving part 121 can be broken at the fracture structure 1211, so that the sealing device and the soluble bridge plug 1 are disconnected, and the sealing part 122 is clamped and sealed at the end of the center pipe 11, so that the center pipe 11 is in a blocked state. At this time, the soluble bridge plug 1 can be individually clamped and sealed at a certain position of the oil well casing, and the fracturing fluid below the soluble bridge plug 1 is sealed between the soluble bridge plug 1 and the bottom of the oil well, while the fracturing fluid between the soluble bridge plug 1 and the wellhead of the oil well can be depressurized to 0MPa in a relatively short time, and after the depressurization is completed, the on-site operation team can install the oil well pump in the oil well casing. Therefore, the soluble bridge plug 1 can be clamped at a preset position in the oil well casing, so that the fracturing fluid in the oil well casing is separated at the soluble bridge plug 1. It is only necessary to depressurize the fracturing fluid between the soluble bridge plug 1 and the inlet of the oil well casing to 0MPa before installing the oil well pump, without depressurizing all the fracturing fluid in the oil well casing to 0MPa. Therefore, the soluble bridge plug 1 can shorten the installation period of the oil well pump.

[0029] In addition, when oil is put into production, it is necessary to release the blockage of the oil well casing by the soluble bridge plug 1. The method of releasing the blockage of the soluble bridge plug 1 is described in detail in the following embodiments of the present invention, and will not be repeated in this embodiment.

[0030] It should be noted that those skilled in the art will understand that the sealing device and the bridge plug are matching devices. The soluble bridge plug 1 in the present invention can be driven or controlled by a conventional sealing device in the art, so the present invention does not elaborate on the structure and principle of the conventional sealing device. The blocking mechanism 13 can also be a common mechanism for soluble bridge plugs in the art, and the present embodiment does not elaborate on its structure and principle. The soluble bridge plug 1 is made entirely of soluble materials commonly used in the art, such as soluble metal materials such as magnesium-aluminum alloys and soluble polymer materials, and the present invention does not elaborate on them.

[0031] like Figure 1 to Figure 2As shown, in some embodiments of the present invention, the blocking mechanism 13 includes a first retaining ring 131, an elastic sleeve 132, a second retaining ring 133 and a first slip structure, the first retaining ring 131 and the second retaining ring 133 are circumferentially fixedly sleeved on the outside of the central tube 11, and the elastic sleeve 132 is circumferentially movably sleeved on the outside of the central tube 11. The first slip structure includes a first guide component 137, a first sleeve ring 1361, a push ring 134 and a plurality of first slips 136. The first guide component 137 and the push ring 134 are sleeved on the outside of the center pipe 11, the push ring 134 is located between the first guide component 137 and the first retaining ring 131, the push ring 134 is connected to the center pipe 11 by a radially extending first sealing pin 135, the first guide component 137 is configured to be able to move along the center pipe 11 toward the elastic sleeve 132, and the radial outer side surface of the first guide component 137 facing one end of the push ring 134 has a first guide surface 1371; along the direction from the push ring 134 to the elastic sleeve 132, the first guide surface 1371 extends radially outward from one end thereof facing the first retaining ring 131 to one end thereof facing the elastic sleeve 132; all the first slips 136 are circumferentially arranged and surround the outer circumference of the center pipe 11, the first slips 136 are located between the push ring 134 and the first guide component 137, and the first slips 136 are configured to be able to move along the center pipe 11 toward the elastic sleeve 132 The radial outer side surface of the core tube 11 and the first guide surface 1371 move toward the elastic sleeve 132; the first ring 1361 is sleeved on the outer circumference of all the first slips 136 to press the first slips 136 against the radial outer side surface of the center tube 11; wherein, based on the first thrust from the first retaining ring 131 to the second retaining ring 133 applied by the sealing device to the push ring 134, the first sealing pin 135 can be sheared in its radial direction, so that the first slip 136 can radially open the constraint of the first ring 1361 under the push of the push ring 134, and further enable the first slip 136 to be clamped between the center tube 11 and the oil well casing after being stacked with the first guide component 137 along the radial direction of the center tube 11; the elastic sleeve 132 is squeezed by the first guide component 137 and the second retaining ring 133 to bulge radially outward and can be sealed between the center tube 11 and the oil well casing.

[0032] Specifically, along the direction from the first retaining ring 131 to the second retaining ring 133, the first retaining ring 131, the push ring 134, the first slip structure, the first guide component 137, the elastic sleeve 132 and the second retaining ring 133 are sequentially distributed. In the initial normal state, along the direction from the first retaining ring 131 to the second retaining ring 133, the first retaining ring 131, the push ring 134, the first slip structure, the first guide component 137, the elastic sleeve 132 and the second retaining ring 133 are sequentially attached end to end. All the first slips 136 are arranged circumferentially and together form an annular first slip structure surrounding the central tube 11. And under the restraint of the first sleeve ring 1361, the first slip 136 is in a state of being tightened and abutting against the radial outer side of the central tube 11, so that the first slip 136 will not fall from the central tube 11; and the elastic sleeve 132 is in a state of no elastic deformation. Preferably, the elastic sleeve 132 can be made of conventional soluble polymer materials, and other components of the soluble bridge plug 1 can be made of conventional soluble metal materials.

[0033] In this embodiment, when the sealing device applies a first thrust from the first retaining ring 131 to the second retaining ring 133 to the push ring 134, the first sealing pin 135 at the push ring 134 is sheared off by the shear force between the push ring 134 and the center pipe 11, and the push ring 134 continues to push the first cava 136 to move toward the second retaining ring 133, and the first cava 136 pushes the first guide component 137 and the elastic sleeve 132 to move toward the second retaining ring 133. The elastic sleeve 132 is squeezed between the second retaining ring 133 and the first guide component 137 to produce a radially outward bulging deformation, and the deformed elastic sleeve 132 can be sealed between the center pipe 11 and the oil well casing. In addition, due to the thrust of the push ring 134, the first cava 136 will also move along the first guide surface 1371, so that the interval between the end of the first cava 136 facing the first guide component 137 and the center pipe 11 gradually increases, and then the first ring 1361 sleeved on all the first cava 136 is stretched open, and the first cava 136 moving along the first guide surface 1371 can eventually be clamped between the first guide component 137 and the oil well casing; that is, in the radial direction of the center pipe 11, the first cava 136 and the first guide component 137 stacked on each other are clamped between the center pipe 11 and the oil well casing, so that the soluble bridge plug 1 is fixed in the oil well casing.

[0034] like Figure 1 to Figure 2As shown, in some embodiments of the present invention, the blocking mechanism 13 includes a second slip structure, and the second slip structure includes a second guide component 138, a second sleeve ring 1391 and a plurality of second slips 139. The second guide component 138 is movably sleeved on the outside of the central tube 11, and the radial outer side surface of the second guide component 138 facing the end of the second retaining ring 133 has a second guide surface 1381; along the direction from the elastic sleeve 132 to the second retaining ring 133, the second guide surface 1381 extends radially inwardly from the end thereof facing the elastic sleeve 132 to the end thereof facing the second retaining ring 133. All the second cavas 139 are arranged circumferentially and surround the outer circumference of the central tube 11. The second cavas 139 are located between the second baffle ring 133 and the second guide component 138. The second guide component 138 is configured to be able to move along the central tube 11 toward the second baffle ring 133. The second sleeve ring 1391 is sleeved on the outer circumference of all the second cavas 139 to press the second cavas 139 against the radial outer surface of the central tube 11. Among them, based on the first thrust applied by the sealing device to the push ring 134 structure from the first baffle ring 131 to the second baffle ring 133, the elastic sleeve 132 and the second guide component 138 push the second cava 139 to move along the second guide surface 1381, so that the second cava 139 radially opens the constraint of the second ring 1391 outward, and further makes the second cava 139 be clamped between the center pipe 11 and the oil well casing after being radially stacked with the second guide component 138 along the center pipe 11; the elastic sleeve 132 is squeezed by the first guide component 137 and the second guide component 138 to bulge radially outward and can be sealed between the center pipe 11 and the oil well casing.

[0035] Specifically, along the direction from the first retaining ring 131 to the second retaining ring 133, the first retaining ring 131, the push ring 134, the first slip structure, the first guide component 137, the elastic sleeve 132, the second guide component 138, the second slip 139 and the second retaining ring 133 are sequentially distributed. Under normal conditions, along the direction from the first retaining ring 131 to the second retaining ring 133, the first retaining ring 131, the push ring 134, the first slip structure, the first guide component 137, the elastic sleeve 132, the second guide component 138, the second slip 139 and the second retaining ring 133 are sequentially attached end to end. All the second slips 139 are arranged circumferentially and together form an annular second slip structure surrounding the central pipe 11. And under the restraint of the second ring 1391, the second cava 139 is in a state of being tightened and pressed against the radial outer side of the center tube 11, so that the second cava 139 will not fall from the center tube 11; similarly, the elastic sleeve 132 is in a state of not undergoing elastic deformation.

[0036] In this embodiment, when the setting device applies a thrust from the first retaining ring 131 to the second retaining ring 133 to the push ring 134, the first setting pin 135 at the push ring 134 is sheared off by the shear force between the push ring 134 and the central pipe 11, and the push ring 134 continues to push the first slip 136 to move toward the second retaining ring 133, and the first slip 136 pushes the first guide component 137, the elastic sleeve 132, the second guide component 138, and the second slip 139 to move toward the second retaining ring 133. During the movement, the elastic sleeve 132 is squeezed between the first guide component 137 and the second guide component 138 to produce a radially outwardly bulging deformation, and the deformed elastic sleeve 132 can be sealed between the central pipe 11 and the oil well casing. In addition, due to the thrust of the push ring 134, the first slip 136 will move along the first guide surface 1371, so that the distance between the end of the first slip 136 facing the first guide component 137 and the central pipe 11 gradually increases, and then the first sleeve ring 1361 sleeved on all the first slips 136 is stretched, and the first slip 136 moving along the first guide surface 1371 can finally be clamped between the first guide component 137 and the oil well casing; and the second slip 139 will move along the second guide surface 1381, so that the end of the second slip 139 facing the second guide component 138 The interval between the end and the central pipe 11 gradually increases, and then the second ring 1391 sleeved on all the second slips 139 is stretched, and the second slips 139 moving along the second guide surface 1381 can also be clamped between the second guide component 138 and the oil well casing; that is, in the radial direction of the central pipe 11, the first slips 136 and the first guide component 137 stacked on each other are clamped between the central pipe 11 and the oil well casing, and the second slips 139 and the second guide component 138 stacked on each other are clamped between the central pipe 11 and the oil well casing, so that the soluble bridge plug 1 is fixed in the oil well casing. Through the first slip structure and the second slip structure, the soluble bridge plug 1 can be firmly anchored in the oil well casing and bear the pressure of the fracturing fluid below the soluble bridge plug 1.

[0037] like Figure 1 to Figure 2 As shown, in some embodiments, a first sliding surface is provided on the radial inner side of one end of the first slip 136 facing the first guide component 137. Along the direction from the first retaining ring 131 to the second retaining ring 133, the first sliding surface extends radially outwardly from the side facing the first retaining ring 131 to the side facing the second retaining ring 133. In the initial state, the first sliding surface and the first guide surface 1371 are in contact with each other. When the first slip 136 is thrusted by the push ring 134, the first sliding surface can move obliquely along the first guide surface 1371. Through the cooperation of the first sliding surface and the first guide surface 1371, the first slip 136 can move in a directional manner and reduce the sliding resistance.

[0038] like Figure 1 to Figure 2As shown, in some embodiments, a second sliding surface is provided on the radial inner side of one end of the second slip 139 facing the second guide member 138. Along the direction from the first retaining ring 131 to the second retaining ring 133, the second sliding surface extends radially inwardly from the side facing the first retaining ring 131 to the side facing the second retaining ring 133. In the initial state, the second sliding surface and the second guide surface 1381 are in contact with each other. When the second slip 139 is thrusted by the push ring 134, the second sliding surface can move obliquely along the second guide surface 1381. Through the cooperation of the second sliding surface and the second guide surface 1381, the second slip 139 can move in a directional manner and reduce the sliding resistance.

[0039] like Figure 1 to Figure 2 As shown, in some embodiments of the present invention, the diameter of the plugging portion 122 is consistent with the outer diameter of the central tube 11. The second retaining ring 133 has a connecting portion and a protruding portion connected to each other, the connecting portion and the protruding portion circumferentially surround the central tube 11, the radial inner side surface of the connecting portion is threadedly connected to the radial outer side surface of the central tube 11, the radial inner side surface of the protruding portion is in contact with the radial outer side surface of the plugging portion 122, and the protruding portion and the plugging portion 122 are connected by a radially extending shear pin 1331. Based on the second thrust from the moving portion 121 to the plugging portion 122 received by the plugging portion 122, the shear pin 1331 breaks and the release component 12 is disconnected from the central tube 11.

[0040] Specifically, the radial outer side surface of the plugging portion 122 is flush with the outer side wall of the central tube 11, so the plugging portion 122 has an edge portion located between the inner side wall and the outer side wall of the central tube 11, the edge portion is in contact with the radial inner side surface of the protruding portion in the radial direction of the central tube 11, and the edge portion is in contact with the end surface of the terminal end of the central tube 11 in the axial direction of the central tube 11. The edge portion is connected to the protruding portion by a shear pin 1331 extending along the radial direction of the central tube 11, and the number of the shear pins 1331 can be one or more. The edge portion enables the plugging portion 122 to resist a tensile force greater than the first tensile force. When the moving portion 121 is subjected to a tensile force in the direction from the terminal end of the central tube 11 to the head end of the central tube 11, the edge portion of the plugging portion 122 can be clamped on the end surface of the terminal end of the central tube 11, so that the plugging portion 122 can maintain a clamped and sealed state with the central tube 11 before the moving portion 121 breaks. However, when the sealing part 122 is subjected to a second thrust in the direction from the head end of the central pipe 11 to the end of the central pipe 11, the sealing part 122 can cut off the shear pin 1331, so that the sealing part 122 and the movable part 121 remaining on the sealing part 122 are respectively disconnected from the central pipe 11. At this time, the central pipe 11 is conductive, and then the entire oil well casing is conductive.

[0041] In this embodiment, the plugging portion 122 is connected to the extension portion by a shear pin 1331, and the shear pin 1331 is easily sheared after being subjected to a shear force, thereby reducing the difficulty of separating the release component 12 from the central pipe 11. Of course, those skilled in the art can set the value of the second thrust for shearing the shear pin 1331 according to the pressure in the oil well casing, and the present invention does not limit this.

[0042] like Figures 1 to 3 As shown, the present invention further provides a plugging device, which includes a sealing device 2 and the above-mentioned soluble bridge plug 1.

[0043] Specifically, when the plugging device is installed at a preset position in the oil well casing, the control setting device 2 applies a first thrust from the head end of the central tube 11 to the end end of the central tube 11 to the plugging mechanism 13, and the plugging mechanism 13 can be clamped and blocked between the central tube 11 and the oil well casing after radially deforming outward; the control setting device 2 applies a first pulling force from the end end of the central tube 11 to the head end of the central tube 11 to the moving part 121, and the moving part 121 can be broken at the fracture structure 1211, and the setting device 2 is disconnected from the plugging mechanism 13, and finally the soluble bridge plug 1 is clamped and blocked at a certain position of the oil well casing. In this embodiment, the use of the above-mentioned plugging device can shorten the installation period of the oil well pump.

[0044] It should be noted that, in the present embodiment, the setting device 2 may be a conventional setting device in the art, and the present invention will not elaborate on the structure and principle of the conventional setting device.

[0045] In some embodiments of the present invention, the sealing device 2 includes a lifting mechanism, which is connected to the head end of the moving part 121 through the head end of the central tube 11, the sealing part 122 is connected to the end of the moving part 121, and the fracture structure 1211 is located between the head end of the moving part 121 and the end of the moving part 121. The lifting mechanism can apply a first pulling force to the moving part 121 in a direction from the end of the moving part 121 to its head end.

[0046] Specifically, when the lifting mechanism of the setting device 2 applies a first pulling force from the end of the central tube 11 to the head end of the central tube 11 to the moving part 121, the moving part 121 breaks at the breaking structure 1211, and the lifting mechanism is disconnected from the plugging part 122. It should be noted that the lifting mechanism can be a conventional mechanism with a lifting function in a conventional setting device in the art, and the present invention will not repeat its structure and principle.

[0047] In some embodiments of the present invention, the setting device 2 further includes a push mechanism, which is movably sleeved on the radial outer side of the first retaining ring 131, and the push ring 134 is located between the push mechanism and the first slip structure. The push mechanism can apply a first thrust to the push ring 134 in a direction from the first retaining ring 131 to the second retaining ring 133.

[0048] Specifically, when the pushing mechanism of the setting device 2 applies a first thrust from the head end of the center pipe 11 to the end end of the center pipe 11 to the pushing ring 134, the pushing ring 134 cuts off the first setting pin 135, and the pushing mechanism continues to push the pushing ring 134 to move toward the second retaining ring 133, so that the first slip structure, the elastic sleeve 132 and the second slip structure can produce radial outward deformation. It should be noted that the pushing mechanism can be a conventional mechanism with a pushing function in a conventional setting device in the field, and the present invention will not repeat its structure and principle.

[0049] like Figures 1 to 3As shown, in some embodiments of the present invention, the lifting mechanism includes a first connecting tube 21, a first joint 22, a second connecting tube 23 and a second joint 24. The radial inner side surface of the end of the first connecting tube 21 is threadedly connected to the radial outer side surface of the head end of the connecting part, and the radial inner side surface of the head end of the first connecting tube 21 is threadedly connected to the radial outer side surface of the end of the first joint 22. The head end of the first joint 22 is provided with a first connecting groove recessed toward its end, and the radial side wall surface of the first connecting groove is threadedly connected to the radial outer side surface of the end of the second connecting tube 23; the second joint 24 is provided with a liquid inlet channel 241 extending along the axial direction of the center tube 11, and the radial side wall surface of the end of the liquid inlet channel 241 is threadedly connected to the radial outer side surface of the head end of the second connecting tube 23, and the head end of the liquid inlet channel 241 is used to connect to the injection pipeline; the pushing mechanism includes a glove throwing sleeve 25, a piston component 26 and a piston sleeve 27; the end movable sleeve of the glove throwing sleeve 25 is arranged on Outside the first retaining ring 131, the glove throwing sleeve 25 is movably sleeved on the outside of the first connecting pipe 21 and the first joint 22, and the piston component 26 is movably sleeved on the outside of the second connecting pipe 23. The radial inner side surface of the head end of the glove throwing sleeve 25 is threadedly connected with the radial outer side surface of the end of the piston component 26. The piston sleeve 27 is sleeved on the outside of the second joint 24. The head end of the piston sleeve 27 is connected to the second joint 24 through a radially extending second sealing pin 271, and the radial inner side surface of the end of the piston sleeve 27 is threadedly connected with the radial outer side surface of the piston component 26. Among them, a driving chamber 261 is provided between the piston component 26 and the second joint 24, and a liquid inlet hole 231 connected to the driving chamber 261 is provided on the side wall of the second connecting tube 23; the pressure liquid entering the driving chamber 261 from the liquid inlet channel 241 and the liquid inlet hole 231 in turn can apply pressure from the end of the second joint 24 to its head end on the second joint 24, so that the second joint 24 can apply a first pulling force to the movable part 121; the pressure liquid entering the driving chamber 261 from the liquid inlet channel 241 and the liquid inlet hole 231 in turn can apply pressure from the head end to the end of the piston component 26 to the piston component 26, so that the piston component 26 can apply a first thrust to the push ring 134 and a second pulling force to the second sealing pin 271 that can cut the second sealing pin 271; the value of the second pulling force is smaller than the value of the first thrust.

[0050] Specifically, the pressure liquid can enter the drive chamber 261 along the liquid inlet channel 241 and the liquid inlet hole 231. When the pressure of the pressure liquid is greater than or equal to the first pressure value and less than the second pressure value, the pressure liquid applies a force toward the first baffle ring 131 to the piston component 26 and a force away from the first baffle ring 131 to the second joint 24. A shear force is formed between the piston component 26 and the second joint 24, and the second sealing pin 271 is sheared off. Then, the pressure liquid drives the piston component 26 to move toward the first baffle ring 131 and drives the second joint 24 to move away from the first baffle ring 131, and at the same time, the volume of the drive chamber 261 expands. When the pressure of the pressure liquid is greater than or equal to the second pressure value and less than the third pressure value, the piston component 26 pushes the push ring 134 by pushing the glove sleeve 25, a shear force is formed between the push ring 134 and the center pipe 11, the first sealing pin 135 is sheared off, and then the push ring 134 further pushes the first cava structure, the first guide component 137, the elastic sleeve 132, the second guide component 138 and the second cava structure to move toward the second baffle ring 133; at the same time, the second joint 24 applies a pulling force to the moving part 121 through the second connecting pipe 23, the first joint 22 and the first connecting pipe 21. When the pressure of the pressure liquid is greater than or equal to the third pressure value, the first cava structure, the elastic sleeve 132 and the second cava structure are completely anchored on the side wall of the oil well casing, and at the same time, the breaking structure 1211 of the movable part 121 is pulled apart by the first connecting tube 21. At this time, the first connecting tube 21 is disconnected from the sealing part 122, and the glove-dropping sleeve 25 movably sleeved on the outside of the first baffle ring 131 can also be disconnected from the first baffle ring 131.

[0051] In some embodiments, a pressure relief chamber 251 is provided between the piston component 26 and the first joint 22, and the pressure relief chamber 251 is also located between the glove throwing sleeve 25 and the second connecting tube 23, and the pressure relief chamber 251 circumferentially surrounds the second connecting tube 23. A plurality of pressure relief holes 252 communicating with the pressure relief chamber 251 are provided on the glove throwing sleeve 25. When the piston component 26 and the first joint 22 move toward each other, the pressure relief chamber 251 shrinks, and the fracturing fluid in the pressure relief chamber 251 can be discharged from the pressure relief holes 252.

[0052] In some embodiments, the first connecting tube 21 and the first joint 22 are connected by a plurality of radially extending anti-rotation pins, and the glove-throwing sleeve 25 is provided with a plurality of openings facing the anti-rotation pins to facilitate the disassembly and assembly of the anti-rotation pins. Of course, for other two components connected by threaded connection, anti-rotation pins can also be installed to prevent the two components from being disconnected.

[0053] like Figure 1 As shown, in some embodiments of the present invention, the plugging device further includes a centralizer 3, and the radial outer side surface of the end of the centralizer 3 is threadedly connected to the radial side wall surface of the head end of the liquid inlet channel 241.

[0054] Specifically, the sealing device 2 is located between the blowout preventer bridge plug and the centralizer 3. The end of the sealing device 2 is connected to the head end of the soluble bridge plug 1, and the head end of the sealing device 2 is connected to the end of the centralizer 3. The centralizer 3 can adjust the posture of the plugging device to prevent the plugging device from being stuck in the oil well casing. Preferably, the centralizer 3 is axially provided with a liquid channel 31, the end of the liquid channel 31 is connected to the liquid inlet channel 241, and the inner side surface of the head end of the liquid inlet channel 241 can be threadedly connected to the radial outer side surface of the liquid outlet end of the injection pipe 4.

[0055] like Figure 1 As shown, the present invention also provides a plugging device, which includes a pressurizing device, an injection pipe 4 and the above-mentioned plugging device, and the pressurizing device injects pressure liquid into the liquid inlet channel 241 through the injection pipe 4, so that the pressure liquid enters the drive chamber 261 to apply pressure to the second joint 24 and the piston component 26. The pressurizing device is a conventional device in the field, and the present invention does not elaborate on its structure and principle. In this embodiment, the use of the above-mentioned plugging device can shorten the installation period of the oil well pump. However, the specific use of the plugging device will be described in detail in the following embodiments of the present invention, and will not be described in detail in this embodiment.

[0056] The present invention also provides an oil well pump installation method, which uses the above-mentioned plugging device. In this embodiment, the oil well pump installation method can shorten the oil well pump installation period.

[0057] The following is a detailed description of the oil well pump installation process in conjunction with the operation process of the plugging equipment.

[0058] In the first step, the plugging device is placed at a preset position in the oil well casing, and the preset position is located at a certain height above the perforation section.

[0059] Of course, those skilled in the art will understand that the perforation section in the oil well casing refers to a section of the oil well casing where the perforation process is performed, and the interior of the oil well casing is connected to the external formation through the holes in the perforation section.

[0060] In addition, those skilled in the art will appreciate that before installing the plugging device, conventional well washing and well cleaning operations need to be performed on the oil well casing, which will not be described in detail in the present invention.

[0061] In the second step, the pressure device located on the ground injects pressure liquid into the driving chamber 261 through the liquid injection pipe 4, and the pressure device will continue to pressurize the pressure liquid. After the pressure liquid enters the driving chamber 261, the pressure liquid applies a force toward the first retaining ring 131 to the piston component 26, and the pressure liquid applies a force away from the first retaining ring 131 to the second joint 24.

[0062] When the pressure liquid is pressurized to a pressure value greater than or equal to the first pressure value and less than the second pressure value (the first pressure value is greater than the initial pressure value of the fracturing fluid in the oil well casing, for example, the first pressure value is 4MPa greater than the initial pressure in the oil well casing, and the second pressure value is 10MPa greater than the initial pressure in the oil well casing), the piston component 26 pulls the piston sleeve 27 to move toward the first retaining ring 131 with a second pulling force, and shearing is formed between the piston sleeve 27 and the second joint 24, and the second sealing pin 271 is cut off. At this time, the piston rod begins to press against the end face of the push ring 134 facing the throw-away sleeve 25, and shearing of the first sealing pin 135 is formed between the push ring 134 and the center pipe 11. The first connecting pipe 21 will pull the moving part 121 in a direction away from the second retaining ring 133.

[0063] In the third step, when the pressure liquid is pressurized to a pressure value greater than or equal to the second pressure value and less than the third pressure value (for example, the second pressure value is 10MPa greater than the initial pressure in the oil well casing, and the third pressure value is 18MPa greater than the initial pressure in the oil well casing), the push ring 134 can apply a first thrust toward the second baffle ring 133, and the first thrust of the push ring 134 causes the first sealing pin 135 to be sheared off.

[0064] Then the glove sleeve 25 pushes the push ring 134 to move toward the second baffle ring 133, and the push ring 134 pushes the first slip 136, the first guide component 137, the elastic sleeve 132, the second slip 139 and the second guide component 138 to move toward the second baffle ring 133. In addition, during the movement of these components toward the second baffle ring 133, the first slip 136 also moves toward the wall of the oil well casing along the first guide surface 1371 and opens the restraint of the first sleeve 1361, and then the first slip 136 moves between the wall of the oil well casing and the first guide component 137, and finally the first slip 136 and the first guide component 137 are jointly clamped between the radial outer side of the central pipe 11 and the radial inner side of the oil well casing. Moreover, under the squeezing of the second guide component 138, the second cava 139 moves along the second guide surface 1381 toward the wall of the oil well casing and stretches the restraint of the second ring 1391, and then the second cava 139 moves between the wall of the oil well casing and the second guide component 138, and finally the second cava 139 and the second guide component 138 are jointly clamped between the radial outer side surface of the center pipe 11 and the radial inner side surface of the oil well casing.

[0065] Furthermore, under the pressure of the first guide member 137 and the second guide member 138, the elastic sleeve 132 bulges radially outward, and the deformed elastic sleeve 132 is sealed between the radial outer side of the central pipe 11 and the radial inner side of the oil well casing. At this time, the first connecting pipe 21 will continue to pull the moving part 121 away from the second retaining ring 133.

[0066] Of course, during the third step, the value of the first thrust is greater than the value of the second tension to ensure that the first setting pin 135 is sheared off after the second setting pin 271 is sheared off.

[0067] In addition, preferably, when the pressure liquid is pressurized to a pressure value greater than or equal to the second pressure value and less than the fourth pressure value (for example, the second pressure value is 10 MPa greater than the initial pressure value in the oil well casing, and the fourth pressure value is 12 MPa greater than the initial pressure value in the oil well casing), the pressure is stabilized within a first preset time period (for example, 5 minutes) to enable the first cava 136, the first guide component 137, the elastic sleeve 132, the second guide component 138 and the second cava 139 to move stably. After the first slip 136, the elastic sleeve 132 and the second slip 139 are anchored on the inner wall of the oil well casing, the pressure liquid is pressurized to a pressure value greater than or equal to the fourth pressure value and less than the third pressure value (for example, the fourth pressure value is 12 MPa greater than the initial pressure value in the oil well casing, and the third pressure value is 18 MPa greater than the initial pressure value in the oil well casing), and the pressure is stabilized within a second preset time period (for example, 5 minutes) to ensure that the first slip 136, the elastic sleeve 132 and the second slip 139 are completely and stably anchored and clamped on the inner wall of the oil well casing.

[0068] In the fourth step, when the pressure liquid is pressurized to a pressure value greater than or equal to the third pressure value (for example, the third pressure value is 18 MPa greater than the initial pressure value in the oil well casing), under the tension of the second joint 24, the first connecting pipe 21 applies a first pulling force toward the second joint 24 to the movable part 121, and the first pulling force causes the movable part 121 to be disconnected at the fracture structure 1211, and the first connecting pipe 21 is disconnected from the plugging part 122. At this time, the connection between the sealing device 2 and the soluble bridge plug 1 can be disconnected.

[0069] The fifth step is to remove the setting device 2 and the injection pipe 4 from the oil well casing, and then release the pressure of the fracturing fluid between the soluble bridge plug 1 and the wellhead of the oil well casing to 0MPa (the fracturing fluid between the soluble bridge plug 1 and the bottom of the oil well casing is blocked by the soluble bridge plug 1 and still has pressure), and then the on-site operation team can implement the oil well pump lowering process in the oil well casing (i.e., install the oil well pump in the oil well casing), and of course the oil well pump is located above the soluble bridge plug 1. Since it is only necessary to release the pressure of the fracturing fluid between the soluble bridge plug 1 and the wellhead of the oil well casing to 0MPa, the time for the entire oil well pump installation construction is greatly shortened.

[0070] In the sixth step, after the oil well pump is installed, that is, after the oil well pump is completed, a pressure liquid with a pressure value of the fifth pressure value (for example, the fifth pressure value is 5MPa greater than the initial pressure value in the oil well casing) is injected into the oil well casing through the booster device, that is, the pressure liquid is injected between the wellhead of the oil well casing and the soluble bridge plug 1. The booster device can be a conventional device in the art that is the same as or different from the pressurizing device, and this embodiment will not be repeated. The fifth pressure value is greater than the initial pressure of the fracturing fluid in the oil well casing, that is, the fifth pressure value is greater than the initial pressure value of the fracturing fluid below the soluble bridge plug 1. When the area is filled with pressure liquid, the pressure liquid will also enter the central tube 11, and the pressure liquid will apply pressure or a second thrust from the fracture structure 1211 to the sealing part 122 to the sealing part 122, and the second retaining ring 133 is fixedly connected to the central tube 11, so a shear force on the shear pin 1331 is formed between the sealing part 122 and the second retaining ring 133, and the shear pin 1331 is sheared off. Then, under the thrust of the pressure liquid, the sealing part 122 is disconnected from the second retaining ring 133 and the central tube 11 respectively, and then the sealing part 122 falls to the bottom of the oil well casing and gradually dissolves. After the sealing part 122 is disconnected, the central tube 11 is turned on, so that the bottom of the soluble bridge plug 1 is connected to the top of the soluble bridge plug 1, and then the entire oil well casing is turned on. At this time, the production channel is opened, and after the oil well pump is turned on, it can be put into production. Of course, the components of the soluble bridge plug 1 remaining on the inner wall of the oil well casing, such as the elastic sleeve 132, the first slip 136 and the second slip 139, will also gradually dissolve completely.

[0071] It should be noted again that after the moving part 121 breaks, a part of the moving part 121 is separated from the central tube 11 along with the first connecting tube 21, and the other part remains on the plugging part 122. The part of the moving part 121 remaining on the plugging part 122 is separated from the central tube 11 along with the plugging part 122 and falls to the bottom of the oil well, that is, the release component 12 is disconnected from the central tube 11 and falls to the bottom of the oil well.

[0072] Of course, other methods may also be used to separate the plugging portion 122 with the remaining movable portion 121 from the central tube 11 or to directly release the blockage of the entire soluble bridge plug 1, such as injecting a dissolving liquid that can dissolve the plugging portion 122 with the remaining movable portion 121 or the entire soluble bridge plug 1 into the central tube 11 or the entire soluble bridge plug 1, and the present invention does not impose any restrictions on this.

[0073] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the present invention to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A soluble bridge plug, characterized in that: The invention comprises a central tube (11) and a release component (12), wherein the release component (12) comprises a movable part (121) and a blocking part (122) connected to each other, wherein the movable part (121) is arranged in the central tube (11), and the movable part (121) is used for being fixedly connected to a setting device, and the movable part (121) is provided with a fracture structure (1211) capable of radial fracture, and the blocking part (122) is clamped and blocked on the axial outer side of the end of the central tube (11), and a blocking mechanism (13) is arranged circumferentially on the outer side of the central tube (11), and the blocking mechanism (13) is used for being movably connected to the setting device; Based on a first thrust applied by the sealing device to the blocking mechanism (13) in a direction from the head end of the central tube (11) to its rear end, the blocking mechanism (13) can be engaged and sealed between the central tube (11) and the oil well casing after radially deforming outward; based on a first pulling force applied by the sealing device to the movable part (121) in a direction from the head end of the central tube (11) to its rear end, the movable part (121) can be broken at the breaking structure (1211) so that the sealing device is disconnected from the blocking mechanism (13); the value of the first pulling force is greater than the value of the first thrust.

2. The soluble bridge plug according to claim 1, characterized in that: The blocking mechanism (13) comprises a first retaining ring (131), an elastic sleeve (132), a second retaining ring (133) and a first slip structure, wherein the first retaining ring (131) and the second retaining ring (133) are circumferentially fixedly sleeved on the outside of the central tube (11), and the elastic sleeve (132) is circumferentially movably sleeved on the outside of the central tube (11); The first slip structure comprises a first guide component (137), a first sleeve ring (1361), a push ring (134) and a plurality of first slips (136); The first guide component (137) and the push ring (134) are sleeved on the outside of the center tube (11); the push ring (134) is located between the first guide component (137) and the first retaining ring (131); the push ring (134) is connected to the center tube (11) via a first sealing pin (135) extending radially; the first guide component (137) is configured to be movable along the center tube (11) toward the elastic sleeve (132); the radial outer side surface of the first guide component (137) facing one end of the push ring (134) has a first guide surface (1371); along the direction from the push ring (134) to the elastic sleeve (132), the first guide surface (1371) extends radially outwardly from one end thereof facing the first retaining ring (131) to one end thereof facing the elastic sleeve (132); All the first slips (136) are arranged circumferentially and surround the outer circumference of the central tube (11); the first slips (136) are located between the push ring (134) and the first guide component (137); the first slips (136) are configured to be movable along the radial outer side surface of the central tube (11) and the first guide surface (1371) toward the elastic sleeve (132); the first sleeve ring (1361) is sleeved on the outer circumference of all the first slips (136) to press the first slips (136) against the radial outer side surface of the central tube (11); Wherein, based on the first thrust applied by the sealing device to the push ring (134) in the direction from the first retaining ring (131) to the second retaining ring (133), the first sealing pin (135) can be sheared in its radial direction, so that the first cava (136) can radially open the constraint of the first sleeve ring (1361) under the push of the push ring (134), and further enable the first cava (136) to be clamped between the center pipe (11) and the oil well casing after being radially stacked with the first guide component (137) along the center pipe (11); the elastic sleeve (132) is squeezed by the first guide component (137) and the second retaining ring (133) to bulge radially outward and can seal between the center pipe (11) and the oil well casing.

3. The soluble bridge plug according to claim 2, characterized in that: The blocking mechanism (13) comprises a second slip structure, wherein the second slip structure comprises a second guide component (138), a second sleeve ring (1391) and a plurality of second slips (139); The second guide component (138) is movably sleeved on the outside of the central tube (11); the radial outer side surface of the second guide component (138) facing the end of the second retaining ring (133) has a second guide surface (1381); along the direction from the elastic sleeve (132) to the second retaining ring (133), the second guide surface (1381) extends radially inwardly from the end facing the elastic sleeve (132) to the end facing the second retaining ring (133); All the second slips (139) are arranged circumferentially and surround the outer circumference of the central tube (11); the second slips (139) are located between the second retaining ring (133) and the second guide component (138); the second guide component (138) is configured to be movable along the central tube (11) toward the second retaining ring (133); the second sleeve ring (1391) is sleeved on the outer circumference of all the second slips (139) to press the second slips (139) against the radial outer surface of the central tube (11); Wherein, based on the first thrust from the first retaining ring (131) to the second retaining ring (133) applied by the sealing device to the push ring (134) structure, the elastic sleeve (132) and the second guide component (138) push the second cava (139) to move along the second guide surface (1381), so that the second cava (139) radially opens the constraint of the second sleeve ring (1391) outward, and further enables the second cava (139) to be clamped between the center pipe (11) and the oil well casing after being radially stacked with the second guide component (138) along the center pipe (11); the elastic sleeve (132) is squeezed by the first guide component (137) and the second guide component (138) to bulge radially outward and can seal between the center pipe (11) and the oil well casing.

4. The soluble bridge plug according to claim 2 or 3, characterized in that: The diameter of the blocking portion (122) is consistent with the outer diameter of the central tube (11); The second retaining ring (133) comprises a connecting portion and a protruding portion connected to each other, the connecting portion and the protruding portion circumferentially surround the central tube (11), the radial inner side surface of the connecting portion is threadedly connected to the radial outer side surface of the central tube (11), the radial inner side surface of the protruding portion is in contact with the radial outer side surface of the blocking portion (122), and the protruding portion and the blocking portion (122) are connected via a radially extending shear pin (1331); Based on the second thrust exerted on the blocking portion (122) in the direction from the moving portion (121) to the blocking portion (122), the shear pin (1331) breaks and the release component (12) is disconnected from the central pipe (11).

5. A blocking device, characterized in that: It comprises a setting device (2) and a soluble bridge plug (1) according to any one of claims 2 to 4.

6. The blocking device according to claim 5, characterized in that: The sealing device (2) includes a lifting mechanism, which is connected to the head end of the moving part (121) through the head end of the central tube (11), the blocking part (122) is connected to the end of the moving part (121), and the breaking structure (1211) is located between the head end of the moving part (121) and the end of the moving part (121), and the lifting mechanism can apply the first pulling force to the moving part (121) in the direction from the end of the moving part (121) to its head end.

7. The blocking device according to claim 6, characterized in that: The setting device (2) further comprises a pushing mechanism, wherein the pushing mechanism is movably sleeved on the radial outer side of the first retaining ring (131), and the pushing ring (134) is located between the pushing mechanism and the first slip structure; The pushing mechanism is capable of applying the first thrust in a direction from the first blocking ring (131) to the second blocking ring (133) to the pushing ring (134).

8. The blocking device according to claim 7, characterized in that: The lifting mechanism comprises a first connecting pipe (21), a first joint (22), a second connecting pipe (23) and a second joint (24); The radial inner side surface of the end of the first connecting tube (21) is threadedly connected to the radial outer side surface of the head end of the connecting portion, and the radial inner side surface of the head end of the first connecting tube (21) is threadedly connected to the radial outer side surface of the end of the first joint (22); the head end of the first joint (22) is provided with a first connecting groove recessed toward its end, and the radial side wall surface of the first connecting groove is threadedly connected to the radial outer side surface of the end of the second connecting tube (23); the second joint (24) is provided with a liquid inlet channel (241) extending along the axial direction of the central tube (11), the radial side wall surface of the end of the liquid inlet channel (241) is threadedly connected to the radial outer side surface of the head end of the second connecting tube (23), and the head end of the liquid inlet channel (241) is used to be connected to a liquid injection pipeline; The pushing mechanism comprises a glove-throwing sleeve (25), a piston component (26) and a piston sleeve (27); The end of the glove-disposable sleeve (25) is movably sleeved on the outside of the first retaining ring (131), the glove-disposable sleeve (25) is movably sleeved on the outside of the first connecting pipe (21) and the first joint (22), the piston component (26) is movably sleeved on the outside of the second connecting pipe (23), the radial inner side surface of the head end of the glove-disposable sleeve (25) is threadedly connected to the radial outer side surface of the end of the piston component (26), the piston sleeve (27) is sleeved on the outside of the second joint (24), the head end of the piston sleeve (27) is connected to the second joint (24) via a radially extending second sealing pin (271), and the radial inner side surface of the end of the piston sleeve (27) is threadedly connected to the radial outer side surface of the piston component (26); A driving chamber (261) is provided between the piston component (26) and the second connector (24); a liquid inlet hole (231) communicating with the driving chamber (261) is provided on a side wall of the second connecting tube (23); the pressure liquid that sequentially enters the driving chamber (261) from the liquid inlet channel (241) and the liquid inlet hole (231) can exert pressure on the second connector (24) from the end of the second connector (24) to the head end thereof, so that the second connector (24) can move toward the moving part (121). Applying the first pulling force; the pressure liquid entering the drive chamber (261) from the liquid inlet channel (241) and the liquid inlet hole (231) in sequence is sufficient to apply pressure from the head end to the tail end of the piston component (26) to the piston component (26), so that the piston component (26) can apply the first thrust to the push ring (134) and apply the second pulling force to the second sealing pin (271) so that the second sealing pin (271) can be sheared; the value of the second pulling force is smaller than the value of the first thrust.

9. The blocking device according to claim 8, characterized in that: The blocking device further comprises a centralizer (3), the radial outer side surface of the end of the centralizer (3) being threadedly connected to the radial side wall surface of the head end of the liquid inlet channel (241).

10. A plugging device, characterized in that: It comprises a pressurizing device, an injection tube (4) and a sealing device according to any one of claims 8 to 9, wherein the pressurizing device injects pressurized liquid into the liquid inlet channel (241) through the injection tube (4) so ​​that the pressurized liquid enters the drive chamber (261) to apply pressure to the second joint (24) and the piston component (26).

11. A method for installing an oil well pump, characterized in that: The blocking device according to claim 10 is used, and comprises the following steps: S1, placing the plugging device above the perforation section in the oil well casing, using the pressurizing device located on the ground to inject pressure liquid into the driving chamber (261) through the injection pipe (4), and using the pressurizing device to increase the pressure of the pressure liquid; S2, increasing the pressure value of the pressure liquid to a value greater than or equal to the first pressure value and less than the second pressure value, so that the second setting pin (271) is sheared by the second tension applied by the piston sleeve (27); S3, increasing the pressure value of the pressure liquid to a value greater than or equal to the second pressure value and less than the third pressure value, so that the first setting pin (135) is sheared off by the first thrust applied by the glove-dropping sleeve (25), and further enabling the blocking mechanism (13) to engage and block between the oil well casing and the center pipe (11); S4, increasing the pressure value of the pressure liquid to be greater than the third pressure value, so that the first connecting pipe (21) breaks the moving part (121) at the breaking structure (1211) with the first pulling force, and further disconnects the setting device (2) from the soluble bridge plug (1); S5. Remove the sealing device (2) and the injection pipe (4) from the oil well casing, then depressurize the fracturing fluid between the soluble bridge plug (1) and the wellhead of the oil well casing to 0 MPa, and then install an oil well pump in the oil well casing.

12. The oil well pump installation method according to claim 11, characterized in that: The step S3 further comprises: After the pressure value of the pressure liquid increases to be greater than or equal to the second pressure value and less than the fourth pressure value, the pressure is stabilized within a first preset time period; When the blocking mechanism (13) is engaged and sealed between the oil well casing and the central pipe (11), the pressure value of the pressure liquid is increased to a value greater than or equal to the fourth pressure value and less than the third pressure value, and the pressure is stabilized within a second preset time period.

13. The oil well pump installation method according to any one of claims 11-12, characterized in that: The step S5 further includes the following steps: S6. A pressure liquid with a fifth pressure value is injected into the oil well casing through a pressure boosting device, and the pressure liquid applies the second thrust to the sealing portion (122) in a direction from the fracture structure (1211) to the sealing portion (122), so that the shear pin (1331) is sheared off, and further the release component (12) is disconnected from the central pipe (11) and falls.

Images