A suspension device for a recycling instrument and a method of operation thereof

Abstract

This invention discloses a suspension device for recovering logging instruments and its operating method. A retaining ring and a compression spring are nested on a shearing sleeve. The two ends of the compression spring contact the rear end of the retaining ring and the front end of the slip, respectively. During use, the compression spring is in a compressed state. The front end of the slip is nested on the rear end of the shearing sleeve, and the front end of the slip and the rear end of the shearing sleeve are radially connected by a coiled pin. The rear end of the slip is provided with multiple circumferentially distributed elastic tiles, each tile spaced apart, and each tile end has serrations on its inner wall. Multiple positioning screws are radially connected to the suspension housing to limit the relative direction of the shearing sleeve and the slip. The front end of the retaining ring contacts the bottom side of the positioning screw located on the shearing sleeve. The interior of the suspension housing near the rear end is provided with a radially constricted bevel, and the rear end of the slip is located at the front end of the constricted bevel. This device enables the logging instrument to be recovered into the protective sleeve and safely suspended inside the protective sleeve, improving the logging success rate and emergency handling capability for complex well conditions.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling and relates to a suspension device for recovering instruments and its working method. Background Technology

[0002] With the rapid advancement of 6-inch and 6.5-inch horizontal well drilling and the large-scale application of over-the-drill-string logging instruments, especially radiometric logging, 4-inch and smaller protective casing tools have become a bottleneck in logging operations. Because these small-sized drill strings have extremely small water holes (smaller than the instrument's outer diameter), logging instruments cannot pass through them normally. Therefore, in emergency situations such as obstruction or jamming during logging, it is impossible to retrieve the instrument string to the surface using a cable-attached retrieval tool. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a suspension device and its working method for recovering logging instruments, so as to realize the recovery of logging instruments into the protective sleeve and safely suspend them in the protective sleeve, thereby improving the logging success rate and emergency handling capability for complex well conditions.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A suspension device for recovering instruments includes a suspension housing, a shearing sleeve, a positioning screw, a compression spring, a coil pin, a locking slip, a retaining ring, and a guide cover.

[0006] The suspension housing contains, from front to rear, a shear sleeve, a retaining ring, a compression spring, and a slip. The retaining ring and the compression spring are nested on the shear sleeve. The two ends of the compression spring contact the rear end of the retaining ring and the front end of the slip, respectively. When in use, the compression spring is in a compressed state. The front end of the slip is nested on the rear end of the shear sleeve. The front end of the slip and the rear end of the shear sleeve are radially connected by a coiled pin. The rear end of the slip is provided with multiple circumferentially distributed elastic tiles. Each tile is spaced apart, and the inner wall of the end of each tile is provided with serrations.

[0007] Multiple positioning screws are radially connected to the suspension housing, which respectively limit the relative direction of the shear sleeve and the slip. The front end of the retaining ring contacts the bottom side of the positioning screw located at the shear sleeve position. A radial constriction slope is provided inside the suspension housing near the rear end position, and the rear end of the slip is located at the front end of the constriction slope.

[0008] Preferably, the diameter of the front end of the shear sleeve is larger than the diameter of the rest, forming a first stepped surface, and one side of the bottom of some positioning screws contacts the first stepped surface; the front end of the collet is provided with a second sliding outer circle, the front end of the second sliding outer circle is provided with a spring limiting end face, the rear end of the second sliding outer circle is provided with a second stepped surface facing the front end of the collet, and the bottom of some other positioning screws contacts the second stepped surface.

[0009] Preferably, each tile is provided with an elastic shrinkage groove, and each constricted bevel is provided with a flow guide groove. The number and width of the elastic shrinkage groove and the flow guide groove are the same. In use, each elastic shrinkage groove corresponds to each flow guide groove.

[0010] Furthermore, the suspension housing has a cover plate mounting groove in the slip section, a guide cover plate is installed in the cover plate mounting groove, and a guide boss is provided at the bottom of the guide cover plate. The guide boss is inserted into the elastic contraction groove, and the circumferential position of the guide boss in the suspension housing corresponds to the circumferential position of one of the guide grooves.

[0011] Preferably, the shear sleeve has a first through hole and a first process mounting hole for the coiled pin, and the slip has a second through hole and a second process mounting hole for the coiled pin. The first process mounting hole and the second process mounting hole are positioned correspondingly when the coiled pin is installed.

[0012] Preferably, the front end of the shear sleeve is provided with an inner conical opening.

[0013] Preferably, there are four positioning screws for limiting the shear sleeve and the slip, which are evenly distributed circumferentially on the suspension housing.

[0014] Preferably, the inclination angle of the constricted bevel is 10°.

[0015] Preferably, the left end of the suspension housing is provided with an NC drill thread.

[0016] A method for operating a suspension device for recovering an instrument based on any one of the above-mentioned methods: When the logging instrument is pulled into the suspension housing from the rear end to the front end, passing through the inside of the slips, and when the front end of the logging instrument contacts the rear end of the shear sleeve, the logging instrument is pulled further towards the front end of the suspension housing. The shear sleeve moves forward with the instrument, but the slips are restricted by their corresponding positioning screws and cannot follow the forward movement. As the pulling force increases, the coil pin connecting the shear sleeve and the slips is sheared. The logging instrument is pulled further forward until the front end of the shear sleeve abuts against the rear end of the drill string outside the suspension housing and stops. At the same time, the compression spring extends. The front end of the compression spring is restricted by the retaining ring at the positioning screw located at the shear sleeve position. The rear end of the compression spring pushes the slips to move axially towards the rear end until the slips adhere to the constricted inclined surface of the suspension housing. Under the thrust of the compression spring, the slips retract, and the serrations on the slips grip the outer circumference of the logging instrument and lock the logging instrument. Thus, the logging instrument is fixed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention uses multiple positioning screws to limit the relative directions of the shear sleeve and slips. After the logging device enters, it continuously pulls the shear sleeve forward until the coiled pin is sheared. Then, the slips are pushed backward by the compression spring, and the slips are inserted into the constricted bevel and retract inward. The serrations on the inner wall of the slips secure the logging device. The suspension device is connected to the uppermost end of a 4-inch or smaller drilling protective sleeve. Used in conjunction with a small-sized drop bar mechanical release device, it enables conventional drop bar release. When encountering obstacles or jamming, or after testing, a cable is used to lower a retrieval tool through the suspension device to retrieve the drop bar, completely pulling the logging instrument into the protective sleeve. Inside the suspension device, the retrieval tool detaches from the drop bar, and the logging instrument is safely suspended within the device. This achieves the retrieval of the logging instrument into the protective sleeve and its safe suspension, improving logging success rate and emergency handling capabilities in complex well conditions.

[0019] Furthermore, the guide boss at the bottom of the guide cover plate can align the elastic contraction groove on the slip with the guide groove on the suspension housing, ensuring the mud circulation path requirements inside the suspension device.

[0020] Furthermore, by aligning the first and second pin mounting holes, it is convenient to install the pins. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the suspension device of the present invention;

[0022] Figure 2 This is a main sectional view of the suspension housing and a feature sectional view of the circulation groove of the present invention;

[0023] Figure 3 This is a main sectional view of the shear sleeve of the present invention;

[0024] Figure 4 This is a front sectional view of the kava of the present invention;

[0025] Figure 5 This is a front view of the guide cover plate of the present invention;

[0026] Figure 6 This is a side view of the guide cover plate of the present invention;

[0027] Figure 7 This is a rear view of the guide cover plate of the present invention;

[0028] Figure 8 This is a schematic diagram of the suspension device shear release trigger of the present invention;

[0029] Figure 9 This is a schematic diagram of the release and locking of the suspension device of the present invention.

[0030] The components include: 1. Suspension housing; 2. Shear sleeve; 3. Positioning screw; 4. Compression spring; 5. Coil pin; 6. Slips; 7. Retaining ring; 8. Guide cover plate; 11. NC drill string thread; 12. Positioning screw mounting threaded hole; 13. Cover plate mounting groove; 14. Flow guide groove; 15. Narrowing bevel; 21. Maximum outer circle; 22. Accommodating step; 23. First sliding outer circle; 24. First coil pin through hole; 25. Inner cone opening; 26. Flow groove; 27. First coil pin process mounting hole; 61. Compression spring limiting end face; 62. Second sliding outer circle; 63. Second coil pin through hole; 64. Elastic contraction groove; 65. Serrated edge; 66. Outer bevel; 67. Second coil pin process mounting hole; 68. Tile; 81. Guide boss; 82. Limiting ear; 83. Through hole; 84. Removal screw hole; 110. Logging instrument; 111. Drill string. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] In all the following figures, the left side represents the front end of the component, and the right side represents the rear end of the component.

[0035] like Figure 1 As shown, the suspension device for recovering instruments according to the present invention includes a suspension housing 1, a shearing sleeve 2, eight positioning screws 3, a compression spring 4, two coil pins 5, a locking slip 6, a retaining ring 7, and a guide cover plate 8.

[0036] like Figure 2As shown, the left end of the suspension housing 1 is machined with NC drill thread 11, and the housing body is machined with two sets of four positioning screw mounting thread holes 12, totaling eight. Each set is arranged around the circumference of the suspension housing 1. A cover plate mounting groove 13 is provided on the circumference of the suspension housing 1. Near the rear end of the suspension housing 1, there are 6 flow guide grooves 14 and a constricted inclined surface 15 with an inclination angle of 10°. The 6 flow guide grooves 14 are set on the constricted inclined surface 15.

[0037] like Figure 3 As shown, the left end face of the shear sleeve 2 is provided with an inner conical opening 25. The diameter of the left end face is larger than the diameter of the rest, forming the maximum outer circle 21, which forms a first step surface facing the rear end. The first step surface serves as the receiving step 22 for the positioning screw 3. During installation, the bottom of the positioning screw 3, which limits the shear sleeve 2, contacts the receiving step 22. To the right of the receiving step 22 is the first sliding outer circle 23. The rear end of the first sliding outer circle 23 is provided with two first coiled pin through holes 24 and two first coiled pin process mounting holes 27. The two first coiled pin through holes 24 and two first coiled pin process mounting holes 27 are evenly distributed along the circumference of the first sliding outer circle 23. Four flow grooves 26 are evenly distributed on the circumference of the shear sleeve 2.

[0038] like Figure 4 As shown, on the left side of the slip 6 is the compression spring limiting end face 61, followed by the second sliding outer circle 62, two second coiled pin through holes 63, six elastic contraction grooves 64 and an outer inclined surface 66. The two second coiled pin process mounting holes 67 and the two second coiled pin through holes 63 are located in the same axial position. During installation, the positions of the two first coiled pin through holes 24 and the two first coiled pin process mounting holes 27 correspond to the positions of the two second coiled pin through holes 63 and the two second second coiled pin process mounting holes 67, respectively. The rear end of the second sliding outer circle 62 is provided with a second stepped surface facing the front end of the slip 6. The bottom of the positioning screw 3 that limits the slip 6 contacts the second stepped surface. The six elastic contraction grooves 64 divide the right side of the slip into six elastic tiles 68. The inner diameter of the right end of each tile 68 is machined with serrations 65, and the right end of each tile 68 is an inwardly contracting outer inclined surface 66.

[0039] The retaining ring 7 and the compression spring 4 are nested on the shear sleeve 2. The front end of the retaining ring 7 contacts the bottom side of the positioning screw 3 located at the position of the shear sleeve 2, and the two ends of the compression spring 4 contact the rear end of the retaining ring 7 and the front end of the compression spring limiting end face 61, respectively.

[0040] The eight positioning screws 3 have the same effective length and help to align and install the shear sleeve 2; the compression spring 4 is a compression spring with flattened ends; the coiled pin 5 has a diameter of 2.5mm; the inner diameter of the retaining ring 7 is the same as the nominal diameter of the first sliding outer circle 23 on the shear sleeve 2, and the outer diameter is slightly lower than the outer diameter of the compression spring 4.

[0041] like Figures 5-7As shown, the bottom of the guide cover plate 8 has a guide boss 81, and the guide cover plate 8 has two limiting ears 82, four through holes 83, and two disassembly screw holes 84. The guide boss 81 is inserted into one of the elastic contraction grooves 64 of the slip 6, restricting the slip 6 to move linearly only on the main centerline axis parallel to the suspension housing 1; the limiting ears 82 are located on the side of the guide cover plate 8 and are used for the auxiliary disassembly of the guide cover plate 8; the four through holes 83 are used to accommodate the four screws that fix the guide cover plate 8 to the suspension housing 1.

[0042] like Figure 1 As shown, the relative installation and connection sequence of the various components of the suspension device in space is as follows:

[0043] First, install the sub-assembly consisting of shear sleeve 2, retaining ring 7, compression spring 4, slip 6, and coiled pin 5. Place the retaining ring 7, compression spring 4, and slip 6 sequentially onto the first sliding outer circle 23 of the shear sleeve 2 from right to left. Align the second coiled pin mounting hole 67 of the slip 6 with the first coiled pin mounting hole 27 of the shear sleeve 2, and insert the locating pins. Since the angle of the mounting holes has been calculated, the first coiled pin through hole 24 on the shear sleeve 2 and the second coiled pin through hole 63 on the slip are now perfectly aligned. Hammer in two 2.5mm diameter coiled pins 5, ensuring their designed length does not protrude from the inner diameter of the shear sleeve 2 or the outer diameter of the slip 6. After installing the coiled pins 5, remove the two locating pins. The sub-assembly is now complete.

[0044] Push the assembled sub-assembly into the suspension housing 1. Slightly rotate the sub-assembly back and forth to adjust its radial direction. Once the guide boss 81 on the guide cover plate 8 can fit into one of the elastic contraction grooves 64 on the slip 6, fix the guide cover plate 8 to the suspension housing 1 with screws. Then, slide the sub-assembly left and right to adjust its axial position on the suspension housing 1 until the positioning screws 3 can be easily inserted. Tighten all eight positioning screws 3. The entire safety suspension section is now installed. Due to the function of the guide boss 81 on the guide cover plate 8, the six elastic contraction grooves 64 on the slip 6 are aligned with the six guide grooves 14 on the suspension housing 1, ensuring the mud circulation path requirements inside the suspension device.

[0045] The spatial connection of the suspension device after installation is as follows: the shear sleeve 2, retaining ring 7, compression spring 4, and slip 6 are connected sequentially from right to left on the central axis of the shear sleeve 2. The shear sleeve 2 and slip 6 are fixed together by two coil pins 5 to form a sub-assembly. The sub-assembly is installed on the central axis of the safety suspension short section by two sets of four positioning screws 3 of the same effective length in each set. The right end face of the maximum outer circle 21 of the shear sleeve 2 is tightly attached to the four positioning screws 3 on the left, and the shear sleeve 2 cannot move to the right. The left end face of the retaining ring is tightly attached to the four positioning screws 3 on the left, and cannot move to the left. The bottom of the four positioning screws 3 on the right contacts the second step surface on the slip 6, restricting the slip 6 from moving to the left. The guide boss 81 on the guide cover plate 8 moves linearly in one of the elastic contraction grooves 64 of the slip 6, aligning the six elastic contraction grooves 64 of the slip 6 with the six guide grooves 14 of the suspension housing 1. The positioning screws 3 are radially and evenly fixed on the suspension housing 1. The guide cover plate 8 is fixed on the suspension housing 1 by screws.

[0046] The working principle of the suspension device is as follows Figure 8 and Figure 9 As shown, in the sub-assembly consisting of shear sleeve 2, retaining ring 7, compression spring 4, slips 6, and coiled pin 5, the left side of retaining ring 7 is limited by the receiving step 22 of shear sleeve 2, while the axial distance between shear sleeve 2 and slips 6 is limited by coiled pin 5, and compression spring 4 is in a compressed and energy-storing state. When logging instrument 110 is pulled into the safety suspension device from right to left, it can smoothly pass through the interior of slips 6. When the left end face of logging instrument 110 contacts the right end face of shear sleeve 2, if logging instrument 110 is pulled to the left, shear sleeve 2 will move to the left with logging instrument 110, but slips 6 are restricted by the four positioning screws 3 on the right end and cannot move to the left. As the pulling force increases, the two coiled pins 5 are sheared, and shear sleeve 2 and slips 6 can have axial relative displacement. If logging instrument 110 is pulled to the left, the left end face of shear sleeve 2 will stop against the right end face of drill string 111. Simultaneously, the compression spring 4 extends, and its left end plane is restricted to the position of the four positioning screws 3 on the left by the retaining ring 7. The right end plane of the compression spring 4 pushes the slip 6 to move axially to the right until the outer inclined surface 66 of the slip 6 contacts the constricted inclined surface 15 of the suspension housing 1. Under the thrust of the compression spring 4, the slip 68 retracts, and the serrations 65 of the slip 6 tightly grip the outer circle of the logging instrument 110 and lock the logging instrument 110, preventing it from moving to the right. At this point, the logging instrument 110 can neither continue to move to the left nor to the right (the logging instrument 110 falls), achieving the purpose of bidirectional braking of the logging instrument 110.

[0047] The suspension device is connected to the top of the 4-inch or smaller drilling protective sleeve and used in conjunction with a small-sized drop bar mechanical release device. This allows for regular drop bar release. When encountering obstacles or jamming, or after the test is completed, the retrieval tool is lowered through the cable to smoothly pass through the suspension device to grab the drop bar, completely pulling the logging instrument 110 into the protective sleeve. Inside the suspension device, the retrieval tool is detached from the drop bar, and the logging instrument 110 is safely suspended inside the suspension device.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A suspension device for recovering instruments, characterized in that, Includes suspension housing (1), shear sleeve (2), positioning screw (3), compression spring (4), coil pin (5), slip (6), retaining ring (7) and guide cover (8); The suspension housing (1) is provided with a shear sleeve (2), a retaining ring (7), a compression spring (4) and a slip (6) in sequence from front to rear. The retaining ring (7) and the compression spring (4) are nested on the shear sleeve (2). The two ends of the compression spring (4) are in contact with the rear end of the retaining ring (7) and the front end of the slip (6) respectively. When in use, the compression spring (4) is in a compressed state. The front end of the slip (6) is nested on the rear end of the shear sleeve (2). The front end of the slip (6) is radially connected to the rear end of the shear sleeve (2) by a coiled pin (5). The rear end of the slip (6) is provided with a plurality of elastic tiles (68) evenly distributed in the circumferential direction. Each tile (68) is spaced apart. The inner wall of the end of each tile (68) is provided with serrations (65). Multiple positioning screws (3) are radially connected to the suspension housing (1) to limit the relative direction of the shear sleeve (2) and the slip (6). The front end of the retaining ring (7) contacts the bottom side of the positioning screw (3) located at the position of the shear sleeve (2). A radial constriction slope (15) is provided inside the suspension housing (1) near the rear end. The rear end of the slip (6) is located at the front end of the constriction slope (15). The front end diameter of the shear sleeve (2) is larger than the diameter of the rest, forming a first step surface. One side of the bottom of some positioning screws (3) is in contact with the first step surface. The front end of the slip (6) is provided with a second sliding outer circle (62), the front end of the second sliding outer circle (62) is provided with a spring limiting end face (61), the rear end of the second sliding outer circle (62) is provided with a second step surface facing the front end of the slip (6), and the bottom of some positioning screws (3) is in contact with the second step surface.

2. The suspension device for recovering instruments according to claim 1, characterized in that, Each tile (68) is provided with an elastic shrinkage groove (64), and each constricted slope (15) is provided with a guide groove (14). The number and width of the elastic shrinkage groove (64) and the guide groove (14) are the same. When in use, each elastic shrinkage groove (64) corresponds to each guide groove (14) in a one-to-one manner.

3. The suspension device for recovering instruments according to claim 2, characterized in that, The suspension housing (1) is provided with a cover plate mounting groove (13) in the part of the slip (6). A guide cover plate (8) is installed in the cover plate mounting groove (13). A guide boss (81) is provided at the bottom of the guide cover plate (8). The guide boss (81) is inserted into the elastic shrinkage groove (64). The guide boss (81) is located in the circumferential position of the suspension housing (1) and corresponds to the circumferential position of one of the guide grooves (14).

4. The suspension device for recovering instruments according to claim 1, characterized in that, The shear sleeve (2) has a first through hole (24) and a first process mounting hole (27) for mounting the coiled pin (5). The slip (6) has a second through hole (63) and a second process mounting hole (67) for mounting the coiled pin (5). The first process mounting hole (27) and the second process mounting hole (67) are positioned corresponding when the coiled pin (5) is installed.

5. The suspension device for recovering instruments according to claim 1, characterized in that, The front end of the shear sleeve (2) is provided with an inner cone opening (25).

6. The suspension device for recovering instruments according to claim 1, characterized in that, There are four positioning screws (3) that limit the shear sleeve (2) and the slip (6), which are evenly distributed on the suspension housing (1) along the circumference.

7. The suspension device for recovering instruments according to claim 1, characterized in that, The inclination angle of the constricted bevel (15) is 10°.

8. The suspension device for recovering instruments according to claim 1, characterized in that, The left end of the suspension housing (1) is provided with an NC drill thread (11).

9. A method for operating the suspension device for recovering instruments according to any one of claims 1-8, characterized in that, When the logging instrument (110) is pulled from the rear end to the front end of the suspension housing (1) into the interior of the suspension housing (1), passing through the interior of the slips (6), when the front end of the logging instrument (110) contacts the rear end of the shear sleeve (2), and the logging instrument (110) is pulled further towards the front end of the suspension housing (1), the shear sleeve (2) will move towards the front end along with the instrument (110), but the slips (6) are restricted by their corresponding positioning screws (3) and cannot follow the movement towards the front end. As the pulling force increases, the coil pin (5) connecting the shear sleeve (2) and the slips (6) is sheared. The logging instrument (110) continues to be pulled towards the front end until the front end of the shear sleeve (2) presses against the suspension housing (110). The drill string (111) stops at the rear end of the drill string (111). At the same time, the compression spring (4) extends. The front end of the compression spring (4) is restricted by the retaining ring (7) at the positioning screw (3) located at the shear sleeve (2). The rear end of the compression spring (4) pushes the slip (6) to move axially to the rear end until the slip (6) plate (68) is attached to the constricted inclined surface (15) of the suspension housing (1). Under the thrust of the compression spring (4), the slip (6) plate (68) will contract. The serrations (65) on the plate (68) hold the outer circle of the logging instrument (110) and lock the logging instrument (110). Thus, the logging instrument (110) is fixed.

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