A deep-water and deep-well expandable bellows running tool

Abstract

The present invention discloses a deep-water deep-well expansion bellows delivery tool, which relates to the field of geology and oil drilling technology. The main structure includes an upper joint, an outer shell, an upper salvage pipe, a core shaft, a slider, a pressure cover, a cutter, an upper retaining spring, a lower retaining spring, a lower salvage pipe, a lower joint and a steel ball. The slider is used for bearing, and the shear screw is used to cut and unlock, so that the bearing and unlocking functions are separated, and the core shaft and the outer shell are unlocked effectively without being restricted by eccentricity, thereby avoiding the risk of being unable to unlock. A one-way valve structure is provided inside the lower joint, and the steel ball is built into the lower joint in advance, thereby avoiding the increase in the process caused by the secondary ball throwing to block the lower end of the pipe body. At the same time, there is no need for the steel ball to pass through the expansion bellows and the salvage pipe from top to bottom, so the diameter of the salvage pipe can be reduced, thereby increasing the adaptability of the salvage pipe to the transition section of the irregular expansion bellows.

Description

Technical Field

[0001] The invention relates to the technical field of geology and oil drilling, in particular to a deep-water deep-well expansion bellows running tool. Background Art

[0002] Expansion bellows wall protection technology: Expansion bellows wall protection technology is an advanced wall protection technology recognized in the fields of geology and oil drilling. This technology expands the expansion bellows with an irregular cross-section into a circular tube body, and squeezes the rubber on the outer wall of the tube body onto the hole wall to form an effective suspension force. Before the expansion bellows are lowered, the accident hole section needs to be expanded in advance. The upper and lower positions of the expansion bellows need to have stable hole walls as suspension sections. The expansion bellows is lowered into the accident hole section using a special delivery tool and pressurized into the tube body. The irregular cross-section expansion bellows expands and deforms due to the liquid pressure, and the cross-section becomes circular. The inner diameter of the tube is larger than the original hole diameter. After the expansion is completed, the delivery tool cuts the upper and lower conical sections of the expansion bellows, and the cut head and tail are salvaged. The upper and lower pipe openings of the expansion bellows are enlarged using the circular joints on the delivery tool, and finally the cut head and tail are salvaged out of the hole.

[0003] Expansion bellows wall protection technology is primarily used in the fields of geology and oil drilling. As drilling progresses into deeper, more remote, and more complex areas, the strata encountered during drilling become increasingly complex, significantly increasing the probability of borehole leakage, collapse, and diameter reduction. Effective wall protection measures are needed to address these issues. Conventional wall protection measures include mud wall protection and casing. Mud wall protection is applied throughout the drilling process, while casing protection depends on the characteristics of the formation in the borehole. If the formation is relatively stable, casing wall protection may not be required. If the formation is unstable, casing must be installed after each drilling pass and cementing must be performed. Generally, a borehole design is required before drilling, and the borehole passes are planned in advance. If leakage, collapse, or diameter reduction occur during drilling, mud wall protection is the first option. If mud wall protection is ineffective, conventional casing installation will reduce the subsequent borehole diameter, affecting the original borehole design. In response to the above situation, the expansion bellows wall protection technology can provide a stable wall protection measure that does not affect the subsequent drilling diameter.

[0004] The expansion bellows wall protection requires the use of a special delivery tool to lower the expansion bellows pipe string into the accident hole section to be protected. The delivery tool has a sealing function, which can realize the pressure of the delivered unit sealing liquid; it has a rotary cutting function, which can cut off the head and tail of the expansion pipe string; it has a salvage function, which can salvage the tail in advance before cutting it to prevent the tail from falling into the hole after being cut.

[0005] Patent application publication number CN112855027A discloses a through-type running method for deep-sea expansion bellows, and patent application publication number CN214836231U discloses a running and salvaging device for expansion bellows for deep-sea drilling. These devices have the following disadvantages: First, the thread unlocking method has poor reliability. When the two threaded parts are not coaxial, the threaded section is prone to getting stuck and unable to be unlocked. Third, the expansion tube string requires secondary ball throwing to seal, which not only increases the process flow but also limits the minimum diameter of the salvage tube because the ball needs to pass through the salvage tube to enter the base, further affecting the passability of the salvage tube within the expansion bellows. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a deepwater deep well expansion bellows running tool, which optimizes and improves the running tool to improve the unlocking reliability during the use of the running tool, avoids the limitation of the salvage pipe diameter due to the ball casting, and minimizes the salvage pipe diameter to meet the passability in the expansion bellows. At the same time, it simplifies the process flow and improves construction efficiency.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides a deepwater deep well expansion bellows running tool, comprising an upper assembly and a lower assembly; the upper assembly comprises an upper joint, an outer shell, an upper salvage pipe, a mandrel, a slider, a gland, a cutter, an upper retaining spring and a lower retaining spring; the upper part of the upper joint is used to connect with a rounding tool, the lower part of the upper joint is connected with the upper part of the outer shell, and the lower part of the outer shell is connected with the upper part of the cutter; the mandrel is arranged in the outer shell, the gland is arranged on the outer wall of the outer shell, the slider is arranged between the mandrel and the gland, and The slider is connected to the core shaft by a shear screw; the lower part of the upper salvage pipe is connected to the upper part of the core shaft, and the top of the upper salvage pipe is connected to the upper retaining spring arranged at the bottom of the upper joint; the lower part of the core shaft is provided with the lower retaining spring; the lower assembly includes a lower salvage pipe, a lower joint and a steel ball; the lower part of the lower salvage pipe is connected to the upper part of the lower joint, and the steel ball is arranged in the lower joint; the upper end of the expansion bellows is connected to the core shaft, and the lower end of the expansion bellows is connected to the lower joint.

[0009] Optionally, the outer shell is a hollow cylindrical structure, and the upper end of the outer shell is provided with an internal shell thread, and the internal shell thread is used to connect with the upper joint; the lower end of the outer shell is provided with an external shell thread, and the external shell thread is used to connect with the cutting knife; at least two circular through grooves are evenly arranged in the middle part of the outer shell in the circumferential direction, and the circular through groove passes through the side wall of the outer shell, and a long groove is symmetrically arranged along the axial direction of the outer shell with the circular through groove as the center, and the long groove is a blind groove that does not pass through the side wall of the outer shell; long groove threaded holes are respectively provided at the upper and lower ends of the long groove, and the long groove threaded holes are used to install the pressure cover.

[0010] Optionally, the outer surface of the spindle is divided into four sections from top to bottom, the first section of the outer surface of the spindle is the end with the largest diameter of the spindle, and is clearance-matched with the inner wall of the outer shell, and at least one O-ring groove is provided on the outer circle of the first section of the outer surface of the spindle to form a radial seal between the spindle and the outer shell; the second section of the outer surface of the spindle has a smaller diameter, and the difference between the radius of the second section of the outer surface of the spindle and the radius of the first section of the outer surface of the spindle is greater than or equal to the dimension of the inner side of the slider to the outer shell that exceeds the inner wall of the outer shell; a plurality of arc grooves are provided at the intersection of the outer circumference of the first section of the outer surface of the spindle and the second section of the outer surface of the spindle, the arc shape of the arc groove matches the slider, the bottom of the arc groove is tangent to the outer wall of the second section of the outer surface of the spindle, and a threaded blind hole is provided in the arc groove for cooperating with the slider to install the shear screw; the third section of the outer surface of the spindle has a diameter The cam is provided with an outer thread which is larger than the diameter of the second section of the outer surface of the spindle and the fourth section of the outer surface of the spindle, and is used to limit the slider to the lower position; the fourth section of the outer surface of the spindle is provided with an external thread for connecting with the expansion bellows; the interior of the spindle is a hollow structure, which is a five-section structure from top to bottom, and the first section of the interior of the spindle is a light hole with a diameter larger than the second section, which is used for the limiting step of the upper salvage pipe; the second section of the interior of the spindle is provided with an internal thread for connecting with the upper salvage pipe; the diameter of the third section of the interior of the spindle is larger than the bottom diameter of the internal thread of the second section of the interior of the spindle, the diameter of the fourth section of the interior of the spindle is the same as the outer diameter of the lower retaining spring, the diameter of the fifth section of the interior of the spindle is larger than the diameter of the fourth section, and a hole elastic retaining ring mounting groove is provided on the inner wall of the fifth section of the interior of the spindle for installing a hole elastic retaining ring, and the hole elastic retaining ring is used to axially limit the lower retaining spring.

[0011] Optionally, the slider is a cylindrical structure, a threaded hole is provided in the center of the cylindrical structure, a deeper circular groove coaxial with the threaded hole is provided at the center of the outer end surface of the slider, and a shallower long groove is provided radially in the middle of the outer end surface of the slider, and the circular groove and the long groove are used to cooperate with the pressure cover; a stepped through hole is provided on the long groove at a certain distance from the circular groove, and the stepped through hole is used to install the shear screw.

[0012] Optionally, a circular portion is provided in the middle of the pressure cover, a connecting portion is provided radially outwardly extending from the circular portion, the free end of the connecting portion is semicircular, and the width of the connecting portion is smaller than the diameter of the circular portion; a through hole is provided on the connecting portion, and the through hole is used to connect with the outer shell.

[0013] Optionally, the outer end surface of the pressure cover is a plane, and the inner end surface of the pressure cover is provided with a positioning frustum concentric with the circular portion and of the same diameter, and the positioning frustum is used to match the circular groove at the center position of the outer end surface of the slider.

[0014] Optionally, the upper salvage pipe and the lower salvage pipe have the same structure, and the upper salvage pipe or the lower salvage pipe includes a structural body, the upper part of the structural body is provided with a guide portion with a gradually decreasing diameter, and the lower part of the structural body is provided with an external thread, and the external thread is used to be connected to the core shaft; the outer wall of the structural body is provided with anti-slip grooves, and the anti-slip grooves are used to match the upper retaining spring or the lower retaining spring to prevent the upper salvage pipe or the lower salvage pipe from slipping.

[0015] Optionally, the exterior of the upper joint is a four-section stepped cylindrical structure, the outer diameter of the first section of the exterior of the upper joint is the same as the diameter of the small end of the compass, the diameter of the second section of the exterior of the upper joint is the same as the diameter of the outer shell, the third section of the exterior of the upper joint is a threaded section for threaded connection with the outer shell, the fourth section of the exterior of the upper joint is a sealing section with a diameter smaller than the major diameter of the third section of the thread on the exterior of the upper joint, and the fourth section of the exterior of the upper joint is provided with at least two rectangular grooves, which are used to install O-rings for forming a seal with the outer shell; the center hole of the upper joint is divided into four parts, and the uppermost end of the center hole of the upper joint is tapered The internal thread is used to install a compass, the second section of the center hole of the upper joint is a light hole that runs through the upper and lower parts, the third section of the center hole of the upper joint is a light hole with a diameter larger than the second section of the center hole of the upper joint, and is used to install a retaining spring, and a step formed by the diameter difference between the second section of the center hole of the upper joint and the third section of the center hole of the upper joint is used to upper limit the upper retaining spring, the fourth section of the center hole of the upper joint has a diameter larger than the third section of the center hole of the upper joint, and is used to install a retaining ring, and the retaining ring limits the upper retaining spring at the lower end, and a rectangular groove is provided at the lower end of the retaining ring for installing an elastic retaining ring for the shaft hole, and the elastic retaining ring for the hole is used to limit the retaining ring.

[0016] Optionally, the lower joint includes a lower joint body and a wing plate, the lower joint body is a cylindrical structure, and a central through hole is machined inside, the aperture of the central through hole is smaller than the diameter of the steel ball, the upper part of the central through hole is a conical surface, used to place the steel ball, the upper end of the conical surface is a threaded hole with a smaller diameter than the steel ball, used to install the lower salvage pipe, the lower end of the central through hole is a conical surface, which is convenient for the expansion bellows to be lowered, and the mud in the hole enters the interior of the lower joint, lifting the steel ball, thereby achieving internal and external communication; the lower part of the lower joint is provided with at least two tapered wing plates, the lower part of the wing plate is smaller and the upper part is larger, and the maximum size of the larger upper part does not exceed the outer diameter of the cutting knife.

[0017] Optionally, the upper retaining spring and the lower retaining spring have the same structure, and the upper retaining spring or the lower retaining spring includes an open ring, and a plurality of anti-slip gripping pieces are provided on the inner wall of the open ring, the lower part of the anti-slip gripping piece is connected to the inner wall of the open ring, and the upper part of the anti-slip gripping piece is a gripping portion inclined toward the center of the open ring.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] (1) The slider is used for bearing and the shear screw is used for unlocking, thereby separating the bearing and unlocking functions. This avoids the risk of being unable to unlock when the outer shell and the spindle are connected by threads and the threads have to bear the bearing and complete the unlocking. In particular, when the two parts of the threaded connection are eccentric, the thread often cannot be unfastened. The method adopted by the present invention can effectively realize the unlocking of the spindle and the outer shell without being restricted by eccentricity, thus avoiding the risk of being unable to unlock.

[0020] (2) A one-way valve structure is set inside the lower joint, and the steel ball is built into the lower joint in advance, which avoids the increase in flow caused by the secondary ball throwing to block the lower end of the pipe body. At the same time, there is no need for the steel ball to pass through the expansion bellows and the salvage pipe from top to bottom, which can reduce the diameter of the salvage pipe and increase the adaptability of the salvage pipe to the irregular expansion bellows transition section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of a deepwater deep well expansion bellows delivery tool according to the present invention;

[0023] Figure 2 This is a schematic structural diagram of the central axis of the deepwater deep well expansion bellows delivery tool of the present invention;

[0024] Figure 3 This is a schematic structural diagram of a slider in a deepwater deep well expansion bellows delivery tool according to the present invention;

[0025] Figure 4 This is a schematic structural diagram of the gland in the deepwater deep well expansion bellows delivery tool of the present invention;

[0026] Figure 5 This is a structural schematic diagram of the gland in the deepwater deep well expansion bellows delivery tool of the present invention from another perspective;

[0027] Figure 6 This is a schematic structural diagram of a retaining spring in a deepwater deep well expansion bellows delivery tool according to the present invention;

[0028] Figure 7 This is a schematic structural diagram of the lower joint in the deepwater deep well expansion bellows delivery tool of the present invention;

[0029] Figure 8 This is a schematic diagram of the partially enlarged structure of point A in the deepwater deep well expansion bellows delivery tool of the present invention;

[0030] Figure 9 This is a schematic structural diagram of the upper salvage pipe in the deepwater deep well expansion bellows delivery tool of the present invention;

[0031] Figure 10 This is a schematic structural diagram of the lower fishing pipe in the deepwater deep well expansion bellows delivery tool of the present invention;

[0032] Figure 11 This is a schematic diagram of the structural changes of the deepwater deep well expansion bellows running tool of the present invention during operation.

[0033] Explanation of the accompanying reference numerals: 1. Upper joint; 2. Outer shell; 3. Upper salvage pipe; 4. Mandrel; 5. Pressure cap; 6. Slider; 7. Cutter; 8. Lower retaining spring; 9. Expansion bellows; 10. Lower salvage pipe; 11. Lower joint; 11-1. Wing plate; 11-2. Lower joint body; 12. Steel ball; 13. Rounding tool; 14. Upper retaining spring. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] like Figures 1 to 11 As shown, this embodiment provides a deep-water deep-well expansion bellows running tool, including an upper assembly and a lower assembly; the upper assembly includes an upper joint 1, an outer shell 2, an upper salvage pipe 3, a spindle 4, a slider 6, a pressure cap 5, a cutter 7, an upper retaining spring 14 and a lower retaining spring 8; the upper part of the upper joint 1 is connected to the rounding tool 13 through a tapered thread, the lower part of the upper joint 1 is connected to the upper part of the outer shell 2 through a thread, and the lower part of the outer shell 2 is connected to the upper part of the cutter 7 through a thread; the spindle 4 is slidably arranged in the outer shell 2, the pressure cap 5 is arranged on the outer wall of the outer shell 2 by two screws, the slider 6 is arranged between the spindle 4 and the pressure cap 5, and the slider 6 It is connected to the pressure cover 5 by a hexagon socket head screw, and the slider 6 is connected to the core shaft 4 by a shear screw; the lower part of the upper salvage pipe 3 is connected to the upper part of the core shaft 4 by a thread, and the top of the upper salvage pipe 3 is connected to the upper retaining spring 14 arranged at the bottom of the upper joint 1; the lower part of the core shaft 4 is provided with a lower retaining spring 8; the lower assembly includes a lower salvage pipe 10, a lower joint 11 and a steel ball 12; the lower part of the lower salvage pipe 10 is connected to the upper part of the lower joint 11 by a thread, and the steel ball 12 is arranged in the lower joint 11; the upper end of the expansion bellows 9 is connected to the outer wall of the core shaft 4, and the lower end of the expansion bellows 9 is connected to the outer wall of the lower joint 11.

[0036] In this specific embodiment, the outer shell 2 is a hollow cylindrical structure, and the upper end of the outer shell 2 is provided with an internal shell thread, which is used to connect to the upper joint 1; the lower end of the outer shell 2 is provided with an external shell thread, which is used to connect to the cutting knife 7; four circular through grooves are evenly arranged in the circumferential direction in the middle of the outer shell 2, and the circular through grooves pass through the side walls of the outer shell 2, and long grooves are symmetrically arranged along the axial direction of the outer shell 2 with the circular through groove as the center, and the long grooves are blind grooves that do not pass through the side walls of the outer shell 2; long groove threaded holes are respectively provided at the upper and lower ends of the long grooves, and the long groove threaded holes are used to install the pressure cover 5.

[0037] The outer surface of the spindle 4 is divided into four sections from top to bottom. The first section of the outer surface of the spindle 4 is the end with the largest diameter of the spindle 4, and is clearance-matched with the inner wall of the outer shell 2. Four O-ring grooves are provided on the outer circle of the first section of the outer surface of the spindle 4, and a radial seal is formed between the spindle 4 and the outer shell 2 by installing O-rings in the O-ring grooves; the diameter of the second section of the outer surface of the spindle 4 is smaller, and the difference between the radius of the second section of the outer surface of the spindle 4 and the radius of the first section of the outer surface of the spindle 4 is greater than or equal to the dimension of the inner side of the slider 6 to the outer shell 2 that exceeds the inner wall of the outer shell 2, that is, after the slider 6 is connected to the pressure cover 5 by the hexagonal cylindrical head screw, the inner end face of the slider 6 contacts the second section of the outer surface of the spindle 4; four arc grooves are provided at the intersection of the outer circumference of the first section of the outer surface of the spindle 4 and the second section of the outer surface of the spindle 4, the arc shape of the arc groove matches the slider 6, the bottom of the arc groove is tangent to the outer wall of the second section of the outer surface of the spindle 4, and a threaded blind hole is provided in the arc groove for The shear screw is installed in conjunction with the slider 6; the diameter of the third section of the outer surface of the spindle 4 is larger than the diameter of the second section and the fourth section of the outer surface of the spindle 4, and is used to limit the slider 6 to the lower position; the fourth section of the outer surface of the spindle 4 is provided with an external thread for connecting with the expansion bellows 9; the interior of the spindle 4 is a hollow structure, with five sections from top to bottom. The first section of the interior of the spindle 4 is a light hole with a diameter larger than the second section, which is used as a limiting step for the upper salvage pipe 3; the second section of the interior of the spindle 4 is provided with an internal thread for connecting with the upper salvage pipe 3; the diameter of the third section of the interior of the spindle 4 is larger than the bottom diameter of the internal thread of the second section of the interior of the spindle 4, the diameter of the fourth section of the interior of the spindle 4 is the same as the outer diameter of the lower retaining spring 8, the diameter of the fifth section of the interior of the spindle 4 is larger than the diameter of the fourth section, and a hole elastic retaining ring mounting groove is provided on the inner wall of the fifth section of the interior of the spindle 4 for installing the hole elastic retaining ring. The hole elastic retaining ring is used to axially limit the lower retaining spring 8.

[0038] The slider 6 is a cylindrical structure with a threaded hole penetrating the center of the cylindrical structure. A deeper circular groove coaxial with the threaded hole is provided at the center of the outer end surface of the slider 6. A shallower long groove is radially provided in the middle of the outer end surface of the slider 6. The circular groove and the long groove are used to cooperate with the pressure cover 5; a stepped through hole is provided on the long groove at a certain distance from the circular groove, and the stepped through hole is used to install a shear screw. This certain distance is required to ensure that the outer wall of the slider 6 is in contact with the side wall of the arc groove, and to ensure that there is sufficient structural strength between the stepped through hole and the threaded hole in the center of the slider 6 to prevent structural damage to the slider 6 when the shear screw is cut off.

[0039] The gland 5 has a circular portion in the middle, with a connecting portion extending radially outward from the circular portion. The free end of the connecting portion is semicircular, and its width is smaller than the diameter of the circular portion. The connecting portion is provided with a through-hole for connection to the outer shell 2. The outer end surface of the gland 5 is flat, and the inner end surface of the gland 5 is concentric with the circular portion and has the same diameter as the circular portion. The positioning cone is designed to mate with the circular groove at the center of the outer end surface of the slider 6.

[0040] The upper and lower salvage tubes 3 and 10 have the same structure. Each of the upper and lower salvage tubes 3 and 10 comprises a main body. The upper portion of the main body is provided with a guide portion with a gradually decreasing diameter. The lower portion of the main body is provided with external threads for connection to the mandrel 4. Anti-slip grooves are provided on the outer wall of the main body. These grooves mate with the upper and lower retaining springs 14 and 8, respectively, to prevent the upper and lower salvage tubes 3 and 10 from slipping. In this embodiment, the anti-slip grooves are serrated.

[0041] In a more specific embodiment, the total lengths of the upper salvage tube 3 and the lower salvage tube 10 may be the same or different.

[0042] In another more specific embodiment, a guide portion with a gradually decreasing diameter is provided on the upper portion of the structural body and may be in a bullet-shaped or conical shape.

[0043] In another more specific embodiment, an axial through hole is provided in the center of the upper salvage pipe 3 or the lower salvage pipe 10 along the axial direction, and radial through holes are provided in the upper and middle parts of the upper salvage pipe 3 or the lower salvage pipe 10 along the radial direction. The axial through hole and the radial through hole are both for connecting the inside and outside of the upper salvage pipe 3 or the lower salvage pipe 10 to prevent the upper salvage pipe 3 or the lower salvage pipe 10 from being squeezed and deformed when the expansion bellows 9 is pressurized.

[0044] The exterior of the upper joint 1 is a four-section stepped cylindrical structure. The outer diameter of the first section of the exterior of the upper joint 1 is the same as the diameter of the small end of the compass 13. The diameter of the second section of the exterior of the upper joint 1 is the same as the diameter of the outer shell 2. The third section of the exterior of the upper joint 1 is a threaded section for threaded connection with the outer shell 2. The fourth section of the exterior of the upper joint 1 is a sealing section with a diameter smaller than the major diameter of the third section of the thread on the exterior of the upper joint 1. The fourth section of the exterior of the upper joint 1 is provided with at least two rectangular grooves for installing O-rings for forming a seal with the outer shell 2. The center hole of the upper joint 1 is divided into four parts, and the uppermost end of the center hole of the upper joint 1 is a tapered internal thread. , used to install the compass 13, the second section of the center hole of the upper joint 1 is a light hole that runs through the upper and lower parts, the third section of the center hole of the upper joint 1 is a light hole with a diameter larger than the second section of the center hole of the upper joint 1, used to install the retaining spring, the step formed by the diameter difference between the second section of the center hole of the upper joint 1 and the third section of the center hole of the upper joint 1 is used to upper limit the upper retaining spring 14, the fourth section of the center hole of the upper joint 1 has a diameter larger than the third section of the center hole of the upper joint 1, and is used to install a retaining ring, the retaining ring limits the upper retaining spring 14 to the lower position, and a rectangular groove is provided at the lower end of the retaining ring for installing an elastic retaining ring for the shaft hole, and the elastic retaining ring for the hole is used to limit the retaining ring.

[0045] The lower joint 11 includes a lower joint body 11-2 and a wing plate 11-1. The lower joint body 11-2 is a cylindrical structure with a central through hole machined inside. The diameter of the central through hole is smaller than the diameter of the steel ball 12. The upper part of the central through hole is a conical surface for placing the steel ball 12. The upper end of the conical surface is a threaded hole with a smaller diameter than the steel ball 12, which is used to install the lower salvage pipe 10. The lower end of the central through hole is a conical surface, which makes it convenient for the mud in the hole to enter the interior of the lower joint 11 when the expansion bellows 9 is lowered, and lift the steel ball 12, thereby achieving internal and external communication; the lower part of the lower joint 11 is provided with four tapered wing plates 11-1, the lower part of the wing plate 11-1 is smaller than the upper part, and the maximum size of the upper part does not exceed the outer diameter of the cutter 7.

[0046] The upper retaining spring 14 and the lower retaining spring 8 have the same structure. The upper retaining spring 14 or the lower retaining spring 8 includes an open ring, and six anti-slip gripping pieces are provided on the inner wall of the open ring. The lower part of the anti-slip gripping piece is connected to the inner wall of the open ring, and the upper part of the anti-slip gripping piece is a gripping part inclined toward the center of the open ring.

[0047] The specific use process of the deep water deep well expansion bellows 9 in the present invention is as follows: Figure 11As shown, in the initial state, the feeding tool carries the expansion bellows 9 to the position where the wall protection is required. During the descent of the feeding tool, the mud in the hole pushes the steel balls into the feeding tool, while balancing the internal and external pressures of the feeding tool, causing the expansion bellows 9 to expand. Afterwards, by pressing down on the outer shell 2, the shear screw is cut and the unlocking is completed. The outer shell 2 can be freely rotated and moved downward so that the cutter 7 can cut the expansion bellows 9 until the slider 6 contacts the lower step of the mandrel 4 to complete the cutting. The rounding tool 13 is inserted into the expansion bellows 9 to round the expansion bellows 9. During this process, the lower salvage pipe 10 is clamped with the lower retaining spring 8 to complete the connection between the upper and lower assemblies, and the upper and lower assemblies can be lifted out synchronously during the lifting process.

[0048] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0049] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A deepwater deep well expansion bellows running tool, characterized by: Including upper assembly and lower assembly; The upper assembly includes an upper joint, an outer shell, an upper salvage pipe, a mandrel, a slider, a gland, a cutter, an upper retaining spring and a lower retaining spring; The upper part of the upper joint is used to be connected to the compass, the lower part of the upper joint is connected to the upper part of the outer shell, and the lower part of the outer shell is connected to the upper part of the cutter; the mandrel is arranged in the outer shell, the pressure cover is arranged on the outer wall of the outer shell, the slider is arranged between the mandrel and the pressure cover, and the slider and the mandrel are connected by a shear screw; the lower part of the upper salvage pipe is connected to the upper part of the mandrel, and the top of the upper salvage pipe is connected to the upper retaining spring arranged at the bottom of the upper joint; the lower part of the mandrel is provided with the lower retaining spring; The lower assembly includes a lower salvage pipe, a lower joint and a steel ball; the lower portion of the lower salvage pipe is connected to the upper portion of the lower joint, and the steel ball is disposed in the lower joint; The upper end of the expansion bellows is connected to the core shaft, and the lower end of the expansion bellows is connected to the lower joint.

2. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The outer shell is a hollow cylindrical structure, and the upper end of the outer shell is provided with an inner shell thread, and the inner shell thread is used to connect with the upper joint; the lower end of the outer shell is provided with an outer shell thread, and the outer shell thread is used to connect with the cutting knife; at least two circular through grooves are evenly arranged in the middle part of the outer shell in the circumferential direction, and the circular through groove passes through the side wall of the outer shell, and a long groove is symmetrically arranged along the axial direction of the outer shell with the circular through groove as the center, and the long groove is a blind groove that does not pass through the side wall of the outer shell; long groove threaded holes are respectively provided at the upper and lower ends of the long groove, and the long groove threaded holes are used to install the pressure cover.

3. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The outer surface of the spindle is divided into four sections from top to bottom, the outer surface of the first section of the spindle being the end with the largest diameter of the spindle, and being clearance-matched with the inner wall of the outer shell, the outer circle of the outer surface of the first section of the spindle is provided with at least one O-ring groove, forming a radial seal between the spindle and the outer shell; the difference between the radius of the second section of the outer surface of the spindle and the radius of the first section of the outer surface of the spindle is greater than or equal to the dimension of the inner side of the slider extending beyond the inner wall of the outer shell on the outer shell; a plurality of arc grooves are provided at the intersection of the outer circumference of the first section of the outer surface of the spindle and the second section of the outer surface of the spindle, the arc shape of the arc groove matches the slider, the groove bottom of the arc groove is tangent to the outer wall of the second section of the outer surface of the spindle, and a threaded blind hole is provided in the arc groove for cooperating with the slider to install the shear screw; the diameter of the third section of the outer surface of the spindle is greater than the diameter of the second section of the outer surface of the spindle and the fourth section of the outer surface of the spindle, and is used for lower limiting the slider; the fourth section of the outer surface of the spindle is provided with an external thread for connecting with the expansion bellows; The interior of the spindle is a hollow structure, with five sections from top to bottom. The first section inside the spindle is a light hole with a diameter larger than that of the second section, which is used as a limiting step for the upper salvage pipe; the second section inside the spindle is provided with an internal thread for connecting with the upper salvage pipe; the diameter of the third section inside the spindle is larger than the bottom diameter of the internal thread of the second section inside the spindle, the diameter of the fourth section inside the spindle is the same as the outer diameter of the lower retaining spring, the diameter of the fifth section inside the spindle is larger than the diameter of the fourth section, and a hole elastic retaining ring mounting groove is provided on the inner wall of the fifth section inside the spindle for installing the hole elastic retaining ring, and the hole elastic retaining ring is used to axially limit the lower retaining spring.

4. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The slider is a cylindrical structure, and a threaded hole is provided in the center of the cylindrical structure. A deeper circular groove coaxial with the threaded hole is provided at the center of the outer end surface of the slider. A shallower long groove is provided radially in the middle of the outer end surface of the slider. The circular groove and the long groove are used to cooperate with the pressure cover; a stepped through hole is provided on the long groove at a certain distance from the circular groove, and the stepped through hole is used to install the shear screw.

5. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: A circular portion is provided in the middle of the pressure cover, and a connecting portion is provided which extends radially outward from the circular portion. The free end of the connecting portion is semicircular, and the width of the connecting portion is smaller than the diameter of the circular portion. A through hole is provided on the connecting portion, and the through hole is used to connect with the outer shell.

6. The deepwater deep well expansion bellows running tool according to claim 5, characterized in that: The outer end surface of the pressure cover is a plane, and the inner end surface of the pressure cover is provided with a positioning cone concentrically and diametrically with the circular portion. The positioning cone is used to match the circular groove at the center position of the outer end surface of the slider.

7. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The upper salvage pipe and the lower salvage pipe have the same structure. The upper salvage pipe or the lower salvage pipe includes a structural body. The upper part of the structural body is provided with a guide portion with a gradually decreasing diameter. The lower part of the structural body is provided with an external thread, and the external thread is used to be connected to the core shaft; the outer wall of the structural body is provided with anti-slip grooves, and the anti-slip grooves are used to match the upper retaining spring or the lower retaining spring to prevent the upper salvage pipe or the lower salvage pipe from slipping.

8. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The exterior of the upper joint is a four-section stepped cylindrical structure, the outer diameter of the first section of the upper joint is the same as the diameter of the small end of the compass, the diameter of the second section of the upper joint is the same as the diameter of the outer shell, the third section of the upper joint is a threaded section for threaded connection with the outer shell, the fourth section of the upper joint is a sealing section with a diameter smaller than the major diameter of the third section of the thread of the upper joint, and the fourth section of the upper joint is provided with at least two rectangular grooves for mounting an O-ring for forming a seal with the outer shell; The center hole of the upper joint is divided into four parts. The uppermost end of the center hole of the upper joint is a tapered internal thread for installing a compass. The second section of the center hole of the upper joint is a light hole that passes through from top to bottom. The third section of the center hole of the upper joint is a light hole with a diameter larger than that of the second section of the center hole of the upper joint, for installing an upper retaining spring. The step formed by the diameter difference between the second section of the center hole of the upper joint and the third section of the center hole of the upper joint is used to upper limit the upper retaining spring. The diameter of the fourth section of the center hole of the upper joint is larger than that of the third section of the center hole of the upper joint, for installing a retaining ring, which limits the lower position of the upper retaining spring. A rectangular groove is provided at the lower end of the retaining ring for installing an elastic retaining ring for the shaft hole, and the elastic retaining ring for the hole is used to limit the retaining ring.

9. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The lower joint includes a lower joint body and a wing plate. The lower joint body is a cylindrical structure with a central through hole machined inside. The diameter of the central through hole is smaller than the diameter of the steel ball. The upper part of the central through hole is a conical surface for placing the steel ball. The upper end of the conical surface is a threaded hole with a smaller diameter than the steel ball for installing the lower salvage pipe. The lower end of the central through hole is a conical surface, which makes it convenient for the mud in the hole to enter the interior of the lower joint when the expansion bellows is lowered, and lift the steel ball, thereby achieving internal and external communication; at least two tapered wing plates are provided at the lower part of the lower joint, the lower part of the wing plate is smaller and the upper part is larger, and the maximum dimension of the upper part does not exceed the outer diameter of the cutting knife.

10. The deepwater deep well expansion bellows running tool according to claim 1, characterized in that: The upper retaining spring and the lower retaining spring have the same structure. The upper retaining spring or the lower retaining spring includes an open circular ring, and a plurality of anti-slip gripping pieces are provided on the inner wall of the open circular ring. The lower part of the anti-slip gripping piece is connected to the inner wall of the open circular ring, and the upper part of the anti-slip gripping piece is a gripping portion inclined toward the center of the open circular ring.

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