Multiple-circulation double-seal packer with bypass
By designing a multi-cycle double-seal packer with built-in bypass, the problem of coiled tubing packers being unable to be used multiple times was solved, realizing a packer capable of multiple cycles and reducing the difficulty and cost of section operations.
Patent Information
- Application Number
- CN202520008743.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing coiled tubing packers require additional circulation channels during downhole operations and cannot be reused multiple times, resulting in high operational difficulty and cost for section operations.
A multi-cycle double-seal packer with built-in bypass was designed, comprising first and second circulation devices, a testing device, and a balancing device. Multiple cycles are achieved through a switching device, reducing the lowering resistance and completing multiple interval operations without rotating the working string.
This enables the packer to be used multiple times, reducing the operational difficulty and cost of section operations, decreasing reliance on additional tools, and improving operational efficiency.
Smart Images
Figure CN223536323U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of petroleum equipment technology, and in particular to a multi-cycle double-seal packer with built-in bypass. Background Technology
[0002] A tubing packer is a downhole tool connected to the downhole tubing string to seal the annular space between the tubing and the casing or open hole of an oil or gas well. The disadvantages of currently available coiled tubing packers are: 1. A separate tool with a circulation channel is required during downhole operations; 2. They are all ordinary single packers, requiring multiple packers to be used in conjunction to complete section operations; 3. After completing a section operation, the packer needs to be retrieved, removed from the wellbore, and reset, making multiple cycles impossible. Utility Model Content
[0003] In view of the above-mentioned defects or deficiencies, the purpose of this utility model is to provide a multi-cycle double-seal packer with built-in bypass.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows:
[0005] A multi-cycle double-seal packer with built-in bypass includes: an upper spindle, a lower spindle, and a valve spindle connected in sequence;
[0006] One end of the upper spindle is provided with a second circulation channel, and the other end of the upper spindle is provided with a test channel. A second circulation mechanism is provided on the second circulation channel, and a test mechanism is provided on the test channel. A glue-filling mechanism is provided between the second circulation mechanism and the test mechanism.
[0007] The lower mandrel has a lower balancing channel at its end, and a lower balancing mechanism is provided on the lower balancing channel; a lower rubber sleeve mechanism is provided between the lower balancing mechanism and the testing mechanism.
[0008] The valve spindle is provided with a first circulation channel, and the first circulation channel is provided with a first circulation mechanism, which is connected to the lower balancing mechanism.
[0009] A shifting spindle is connected to the upper spindle, and a shifting mechanism is installed on the shifting spindle. The shifting mechanism is connected to the second circulation mechanism. The shifting spindle is connected to the upper spindle via a splined spindle. A splined outer cylinder is provided on the outer circle of the splined spindle. The upper spindle and the lower spindle are connected via an extension shaft. The lower spindle and the valve spindle are connected via a spindle connector.
[0010] The outer circular surface of the transposition mandrel is provided with an M-shaped transposition groove. The M-shaped transposition groove has an initial position, a transition position, a cycle position, a test position, a balance position, and a preparation position. The spline mandrel includes multiple radially outward-extending splines, which mesh with multiple radially inward-extending splines on the spline outer cylinder to prevent the transposition mandrel from rotating.
[0011] The shifting mechanism includes: a grease injection short section and a shifting sleeve sleeved outside the shifting mandrel; the end of the grease injection short section is connected to the outer cylinder of the shifting outer cylinder, the outer circle of the grease injection short section is provided with a grease injection hole, and the grease injection hole is filled with a grease plug; tapered roller bearings are installed on the outer circles of the stepped ends of the shifting sleeve, and a shifting lug is fixedly installed in the middle of the shifting sleeve; the shifting mandrel performs a non-rotating reciprocating motion of the working tubing with the shifting lug and the shifting sleeve.
[0012] The second circulation mechanism includes: an upper balance cylinder and a pressure transmission short section disposed on the outer circle of the upper spindle; a second circulation channel is disposed on the upper balance cylinder and communicates with the inner cavity of the upper spindle; the upper spindle is provided with a second circulation hole communicating with the upper balance cylinder and a first pressure transmission hole communicating with the pressure transmission short section; the right end face of the pressure transmission short section is provided with a pressure transmission channel communicating with the first pressure transmission hole.
[0013] The glue-applying cylinder mechanism includes: a glue-applying cylinder mandrel fitted on an upper mandrel, a glue-applying cylinder assembly fitted on the glue-applying cylinder mandrel, and an upper sliding joint installed at the other end of the glue-applying cylinder assembly; the left end of the glue-applying cylinder mandrel is connected to a pressure transmission hole, and the glue-applying cylinder assembly, the glue-applying cylinder mandrel, and the upper sliding joint form an annular space.
[0014] The testing mechanism includes: a test connector mounted on the upper mandrel, a test hole communicating with the test connector is opened at the right end of the outer circle of the upper mandrel, and the test channel is set on the test connector.
[0015] The lower glue tube mechanism includes: a connecting joint lower pressure transmission short section and a lower glue tube mandrel, which are sequentially installed on the outer circle of the lower mandrel end. The inner hole at the left end of the connecting joint is connected to the testing mechanism. The outer circle of the lower mandrel is provided with a second pressure transmission hole that communicates with the lower pressure transmission short section. A lower glue tube assembly is installed outside the lower glue tube mandrel. The right end of the lower pressure transmission short section is connected to the left end of the lower glue tube assembly. A lower sliding joint is connected to the right end of the lower glue tube assembly. The lower glue tube assembly, the lower glue tube mandrel, and the lower sliding joint form an annular space.
[0016] The lower balancing mechanism includes: a lower balancing cylinder installed at the end of the lower spindle, and a spring outer cylinder connected to the right end of the lower balancing cylinder; the outer circle of the lower spindle has a balancing hole communicating with the lower balancing cylinder.
[0017] A shifting spring is provided outside the valve spindle. The shifting spring and the spring outer cylinder are fixedly installed. The end of the shifting spring is connected to a valve connector, a piston cylinder, a differential pressure piston, a valve spring, and a guide shoe. A circulation outer cylinder is installed outside the valve spring. The radially outwardly extending boss of the valve spindle contacts the left end face of the differential pressure piston. The first circulation channel is provided on the circulation outer cylinder. A first circulation hole is opened on the differential pressure piston. The first circulation hole cooperates with the first circulation channel. The valve spring is located between the lower end face of the differential pressure piston and the stepped end face of the left end inner hole of the circulation outer cylinder.
[0018] Compared with existing technologies, the beneficial effects of this utility model are as follows:
[0019] This invention provides a multi-cycle dual-sealing packer with built-in bypass. The first circulation device features a circulation port, allowing for smooth lowering of the packer with reduced resistance. Fluid is circulated within the well. The workpiece string is lowered to a predetermined position, and well fluid is pumped into the tubing. When the pumping speed is sufficient, the circulation port closes, and the upper and lower rubber sleeves expand, isolating the oil layer to be sealed. The workpiece string is then lowered, and its weight closes the pressure port and locks the first circulation position in the closed position without rotating the workpiece string. After completing one section of operation, a second section of operation can be performed without re-extracting the wellbore, repeating the cycle. The second circulation device defines the circulation port of the upper mandrel and the outer cylinder. The circulation port, when the upper mandrel's circulation port is in the circulation position, connects the second circulation channel, allowing circulation of the annulus above the upper rubber sleeve assembly. The testing device includes test ports defining the upper mandrel and the outer test cylinder. When the upper mandrel's test port is in the testing position, the testing channel is connected, and the fluid from the test port enters the tubing through it. In this state, the first circulation device, the second circulation device, and the balancing device are all closed. The balancing device, when the second circulation channel and the testing channel are both open, opens the channel between the lower balancing outer cylinder and the lower mandrel's balancing port to balance the pressure difference between the upper and lower rubber sleeves, facilitating the packer's release and preventing damage to the rubber sleeves. The multi-cycle double-seal packer with coiled tubing connection overcomes the shortcomings of current coiled tubing packers in multi-cycle operation, reducing the difficulty and cost of operation within this range.
[0020] Furthermore, in this invention, the transposition device design provides a transposition lug and an M-shaped transposition groove. The M-shaped transposition groove is set on the outer surface of the transposition mandrel, and the transposition lug is fixed inside the transposition sleeve. By operating the interaction between the mandrel string and the transposition sleeve, the mandrel string moves up and down reciprocally, and the transposition sleeve rotates, allowing the mandrel string to cycle between the initial position (pressurized position), transition position, cyclic position, test position, balance position, and preparation position. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the multi-cycle double-seal packer with built-in bypass of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the M-type transposition groove of this utility model;
[0023] Figure 3 This is a schematic diagram of the working structure of this utility model. Figure 1 ;
[0024] Figure 4 This is a schematic diagram of the working structure of this utility model. Figure 2 ;
[0025] Figure 5 This is a schematic diagram of the working structure of this utility model. Figure 3 ;
[0026] Figure 6 This is a schematic diagram of the working structure of this utility model. Figure 4 ;
[0027] Figure 7 This is a schematic diagram of the working structure of this utility model. Figure 5 .
[0028] In the diagram, 1—Upper connector; 2—Transfer mandrel; 3—Grease plug; 4—Grease inlet section; 5—Transfer mandrel outer cylinder; 6—Transfer sleeve; 7—Transfer lug; 8—Splined outer cylinder; 9—Splined shaft; 10—Upper mandrel; 11—Upper balance cylinder; 12—Pressure inlet section; 13—Glue cartridge assembly; 14—Glue cartridge mandrel; 15—Upper sliding connector; 16—Test connector; 17—Extension cylinder; 18—Extension shaft; 19—Connecting connector; 20—[unclear text - possibly related to connector design].
[0029] 21—Lower spindle; 22—Lower balance cylinder; 23—Spindle connector; 24—Spring outer cylinder; 25—Valve spindle;
[0030] —Shift spring; 26—Valve connector; 27—Piston cylinder; 28—Differential pressure piston; 29—Outer circulation cylinder; 30
[0031] —Valve spring; 31—Plug head; 32—Guide shoe; 33—Support seal; 35—First O-ring; 36—Second O-ring; 37—Third O-ring; 38—Fourth O-ring; 39—Fifth O-ring; 40—Sixth O-ring; 41—Seventh O-ring; 42—Eighth O-ring; 43—Ninth O-ring; 44—Tenth O-ring; 45—Eleventh O-ring; 46—Tapest roller bearing; 47—Thirty-fifth O-ring; 48—Twelfth O-ring; 49—Thirteenth O-ring; 50—Fourteenth O-ring; 51—Fifteenth O-ring; 52—Thirty-sixth O-ring; 53—Thirty-seventh O-ring; 54—Sixteenth O-ring; 55—Seventeenth O-ring; 56—Eighteenth O-ring; 57—Nineteenth O-ring; 58—Twentieth O-ring; 59—Twenty-first O-ring; 60—Twenty-second O-ring; 61—Twenty-third O-ring; 62—Twenty-fourth O-ring; 63—Twenty-fifth O-ring; 64—Twenty-sixth O-ring; 65—Twenty-seventh O-ring; 66—Twenty-eighth O-ring; 67—Twenty-ninth O-ring; 68—Thirtieth O-ring; 69—Thirty-eighth O-ring; 70—Thirty-ninth O-ring; 71—Thirty-first O-ring; 72—Thirty-second O-ring; 73—Thirty-third O-ring O-ring; 74—Support seal; 75—Thirty-fourth O-ring; 76—Lower pressure transmission section; 77—Lower glue cartridge mandrel; 78—Lower glue cartridge assembly; 79—Lower sliding joint; 201—M-type transposition groove; 202—Outer circular surface of transposition mandrel; 2011—Initial position; 2012—Transition position; 2013—Circulation position; 2014—Test position; 2015—Balance position; 2016—Preparation position; 401—Grease injection hole; 1001—Second circulation hole; 1002—First pressure transmission hole; 1003—Test hole; 1101—Second circulation channel; 1201—Pressurization channel; 1301—Glue application Annular space of the cylinder; 1601—Test channel; 2001—Pressure hole; 7601—Pressure transmission channel; 2001—Second pressure transmission hole; 2002—Balance hole; 2101—Balance channel; 2201—Right end face of the outer circle of the step of the mandrel connecting shaft; 2401—First circulation port; 2402—Right end face of the radially outward extending boss; 2601—Left end face of the valve connector; 2801—First circulation hole; 2802—Left end face of the differential pressure piston; 2803—Right end face of the differential pressure piston; 2901—First circulation channel; 2902—Step end face of the inner hole of the left end of the circulation outer cylinder; 7801—Annular space of the lower rubber cylinder. Detailed Implementation
[0032] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.
[0033] like Figure 1 , 2 As shown, this utility model provides a multi-cycle double-seal packer with built-in bypass, including: an upper spindle 10, a lower spindle 20, and a valve spindle 24 connected in sequence;
[0034] One end of the upper spindle 10 is provided with a second circulation channel 1101, and the other end of the upper spindle 10 is provided with a test channel 1601. A second circulation mechanism is provided on the second circulation channel 1101, and a test mechanism is provided on the test channel 1601. A glue-filling mechanism is provided between the second circulation mechanism and the test mechanism.
[0035] The lower mandrel 20 has a lower balancing channel 2101 at its end, and a lower balancing mechanism is provided on the lower balancing channel 2101; a lower rubber tube mechanism is provided between the lower balancing mechanism and the testing mechanism.
[0036] The valve spindle 24 is provided with a first circulation channel 2901, and the first circulation channel 2901 is provided with a first circulation mechanism, which is connected to the lower balancing mechanism.
[0037] Preferably, a shifting spindle 2 is connected to the upper spindle 10, and a shifting mechanism is installed on the shifting spindle 2. The shifting mechanism is connected to the second circulation mechanism. The shifting spindle 2 is connected to the upper spindle 10 via a splined spindle 9, and a splined outer cylinder 8 is provided on the outer circumference of the splined spindle 9. The upper spindle 10 is connected to the lower spindle 20 via an extension shaft 18, and the lower spindle 20 is connected to the valve spindle 24 via a spindle connector 22. An upper connector 1 is installed on the shifting spindle 2.
[0038] In addition, such as Figure 3 As shown, the outer circular surface 202 of the transposition mandrel 2 is provided with an M-shaped transposition groove 201. The M-shaped transposition groove 201 has an initial position 2011, a transition position 2012, a circulation position 2013, a test position 2014, a balance position 2015, and a preparation position 2016. The spline mandrel 9 includes multiple radially outward-extending splines, which mesh with multiple radially inward-extending splines of the spline outer cylinder 8 to prevent the transposition mandrel 2 from rotating.
[0039] In this invention, the transposition mechanism includes: a grease injection short section 4 and a transposition sleeve 6 sleeved outside the transposition mandrel 2; the end of the grease injection short section 4 is connected to the outer cylinder 5 of the transposition outer cylinder 5, and the outer circumference of the grease injection short section 4 is provided with a grease injection hole 401, the grease injection hole 401 being filled with a grease plug 3. The outer circumference of the transposition sleeve 6 at both ends is equipped with tapered roller bearings 46, and the middle of the transposition sleeve 6 is fixedly equipped with a transposition lug 7. The transposition mandrel 2 performs a non-rotating reciprocating motion of the working tubing with the transposition sleeve 6 via the transposition lug 7.
[0040] The second circulation mechanism includes:
[0041] An upper balance cylinder 11 and a pressure transmission stub 12 are disposed on the outer circle of the upper spindle 10; a second circulation channel 1101 is disposed on the upper balance cylinder 11 and communicates with the inner cavity of the upper spindle 10; the upper spindle 10 is provided with a second circulation hole 1001 communicating with the upper balance cylinder 11 and a first pressure transmission hole 1002 communicating with the pressure transmission stub 12; a pressure transmission channel 1201 communicating with the first pressure transmission hole 1002 is provided on the right end face of the pressure transmission stub 12.
[0042] The glue-applying cylinder mechanism includes:
[0043] A glue-applying spindle 14 is mounted on the upper spindle 10. A glue-applying assembly 13 is mounted on the glue-applying spindle 14. An upper sliding joint 15 is installed at the other end of the glue-applying assembly 13. The left end of the glue-applying spindle 14 is connected to the pressure transmission hole 1002.
[0044] The testing facility includes:
[0045] The test connector 16 is installed on the upper spindle 10. The right end of the outer circle of the upper spindle 10 is provided with a test hole 1003 that communicates with the test connector 16. The test channel 1601 is provided on the test connector 16.
[0046] The lower glue cylinder mechanism includes:
[0047] A pressure-transmitting sub-section 76 and a lower glue tube spindle 77 are sequentially installed on the outer circumference of the lower spindle 20. The inner hole at the left end of the connecting joint 19 is connected to the testing mechanism. The outer circumference of the lower spindle 20 is provided with a second pressure-transmitting hole 2001 communicating with the lower pressure-transmitting sub-section 76. A lower glue tube assembly 78 is installed outside the lower glue tube spindle 77. The right end of the lower pressure-transmitting sub-section 76 is connected to the left end of the lower glue tube assembly 78. The right end of the lower glue tube assembly 78 is connected to a lower sliding joint 79. The lower glue tube assembly 78, the lower glue tube spindle 77, and the lower sliding joint 79 form an annular space 7801 for the lower glue tube. A pressurization channel 7601 is provided inside the lower pressure-transmitting sub-section 76. The connecting joint 19 is connected to the testing mechanism through an extension shaft 18. An extension tube 17 is provided on the extension shaft 18. The right end of the extension tube 17 is connected to the inner hole at the left end of the connecting joint 19.
[0048] The lower balancing mechanism includes:
[0049] The lower balance cylinder 21 is installed at the end of the lower mandrel 20. The right end of the lower balance cylinder 21 is connected to the spring outer cylinder 23. The outer circle of the lower mandrel 20 has a balance hole 2002 that communicates with the lower balance cylinder 21. The twenty-seventh O-ring 65 is installed between the lower balance cylinder 21 and the lower rubber cylinder mandrel 77.
[0050] A shifting spring 25 is provided outside the valve spindle 24. The outer sleeve 23 of the shifting spring 25 is fixedly installed. The end of the shifting spring 25 is connected to a valve connector 26, a piston cylinder 27, a differential pressure piston 28, a valve spring 30, and a guide shoe 32. A circulation outer sleeve 29 is installed outside the valve spring 30. The radially outwardly extending boss 2402 of the valve spindle 24 contacts the left end face 2802 of the differential pressure piston 28. The first circulation channel 2901 is provided on the circulation outer sleeve 29. The differential pressure piston 28 has a first circulation hole 2801, which mates with the first circulation channel 2901. The valve spring 30 is located between the lower end face 2803 of the differential pressure piston 28 and the stepped end face 2902 of the left end inner hole of the circulation outer sleeve 29.
[0051] In its specific structure, this utility model includes an upper connector 1, with a transposition mandrel 2 connected to its right end. The transposition mandrel 2 is externally provided with a grease injection short section 4 and a transposition sleeve 6. The right end of the grease injection short section 4 is connected to the outer cylinder 5 of the transposition mandrel. Tapered roller bearings 46 are mounted on the stepped outer circumferences at both ends of the transposition sleeve 6. A spline mandrel 9 is connected to the right end of the transposition mandrel 2. A spline outer cylinder 8 is provided on the outer circumference of the spline mandrel 9. The left end of the spline outer cylinder 8 is connected to the right end of the outer cylinder 5 of the transposition mandrel. An upper mandrel 10 is connected to the right end of the spline mandrel 9. An upper balance cylinder 11, a pressure transmission short section 12, a rubber sleeve mandrel 14, and a test connector 16 are provided on the outer circumference of the upper balance cylinder 10. The left end of the upper balance cylinder 11 is connected to the right end of the splined outer cylinder 8. The right end of the upper balance cylinder 11 is connected to the left end of the pressure transmission short section 12. The right end of the pressure transmission short section 12 is connected to the left end of the upper rubber sleeve assembly 13. The right end of the upper rubber sleeve assembly 13 is connected to the right end of the sliding joint 15. The left end of the rubber sleeve mandrel 14 is connected to the inner hole of the right end of the pressure transmission short section 12. The right end of the rubber sleeve mandrel 14 is connected to the test joint 16. The right end of the upper mandrel 10 is connected to the left end of the extension shaft 18. An extension cylinder 17 is provided outside the extension shaft 18. The left end of the extension cylinder 17 is connected to the right end of the test joint 16. The right end of the extension cylinder 17 is connected to the left end of the connecting joint 19. The right end of the connecting joint 19 is connected to the left end of the pressure transmission short section 76. The extension shaft 18 is connected to the lower spindle 20 at its right end. A lower rubber sleeve spindle 77 is provided outside the lower spindle 20. The left end of the lower rubber sleeve spindle 77 is threaded to the inner hole of the right end of the lower pressure transmission stub 76. The right end of the lower rubber sleeve spindle 77 is connected to the left end of the lower balance cylinder 21. A lower rubber sleeve assembly 78 is provided outside the lower rubber sleeve spindle 77. The left end of the lower rubber sleeve assembly 77 is threaded to the right end of the lower pressure transmission stub 76. The right end of the lower rubber sleeve assembly 78 is connected to the left end of the lower sliding joint 79. The right end of the lower balance cylinder 21 is connected to the left end of the spring outer cylinder 23. The right end of the lower spindle 20 is connected to the left end of the spindle connector 22. The right end of the spindle connector 22 is connected to the valve. The left end of the mandrel 24 is connected to a valve mandrel with a shifting spring 25, a spring outer cylinder 23, a valve connector 26, a differential pressure piston 28, a piston cylinder 27, a valve spring 30, a circulation outer cylinder 29, and a guide shoe 32. The right end of the spring outer cylinder 23 is connected to the left end of the valve connector 26. The right end of the valve connector 26 is connected to the left end of the piston cylinder 27. The right end of the piston cylinder 27 is connected to the left end of the circulation outer cylinder 29. The right end of the circulation outer cylinder 29 is connected to the left end of the guide shoe 32. The inner hole of the right end of the valve mandrel 24 is connected to the left end of the plug head 31. A thirty-third O-ring 73 is installed between the circulation outer cylinder 29 and the plug head 31. A thirty-fourth O-ring 75 is installed between the circulation outer cylinder 29 and the guide shoe 32.
[0052] The valve spindle 24 is connected to the spindle connecting shaft 22 at its left end and to the plug head 31 at its right end. A valve connector 26, a differential pressure piston 28, and a valve spring 30 are disposed outside the valve spindle 24. A thirty-first O-ring 71 is installed between the valve spindle 24 and the valve connector 26. The right end of the valve connector is connected to the inner hole of the left end of the piston cylinder 27. The right end of the piston cylinder 27 is connected to the inner hole of the left end of the circulating outer cylinder 29. A ninth O-ring 43 is installed between the piston cylinder 27 and the differential pressure piston 28. Third O-rings 44 and 72 are installed between the differential pressure piston 28 and the circulating outer cylinder 29. The valve spring 30 is disposed between the lower end face 2803 of the differential pressure piston 28 and the stepped end face 2902 of the inner hole of the left end of the circulating outer cylinder 29. Thirty-eighth and thirty-ninth O-rings 69 and 70 are installed between the spindle connecting shaft 22 and the valve spindle 24, and a thirty-first O-ring 71 is installed between the valve connector 26 and the valve spindle 24.
[0053] The upper end of the shifting mandrel 2 is connected to the inner hole of the right end of the upper connector 1. An M-shaped shifting groove 201 is formed on the outer surface 202 of the shifting mandrel 2. The M-shaped shifting groove 201 has initial position, pressurization position, transition position, circulation position, test position, balance position, and preparation position. A grease injection short section 4, a shifting sleeve 6, and a splined outer cylinder 8 are provided outside the shifting mandrel 2 and connected to the splined mandrel 9. The splined mandrel 9 includes multiple radially outward-extending splines, which mesh with multiple radially inward-extending splines of the splined outer cylinder 8 to prevent rotational movement of the shifting mandrel 2. A grease injection plug 3 is provided on the outer circumference of the grease injection short section, and a grease injection hole 401 is provided on the grease injection short section. The shifting lug 7 is fixed to the shifting sleeve 6. The mandrel 2 achieves the non-rotating reciprocating motion of the working tubing through the shifting lug 7 and the shifting sleeve 6. The shifting sleeve 6 is fixed inside the shifting outer cylinder 5 by the grease injection short section 4, the splined outer cylinder 8 and the tapered roller bearing 46, and rotates. The splined mandrel 9 is connected to the upper mandrel 10, the upper mandrel 10 is connected to the extension shaft 18, the extension shaft 18 is connected to the lower mandrel 20, and the lower mandrel 20 is connected to the mandrel connector 22. The shifting spring 25 is set between the right end face 2201 of the outer circle of the step of the mandrel connector 22 and the left end face 2601 of the valve connector 26. A first O-ring 35 is installed between the grease injection short section 4 and the shifting mandrel 2, and a second O-ring 36 is installed between the splined mandrel 9 and the shifting mandrel 2.
[0054] The left end of the upper spindle 10 is connected to the inner hole of the right end of the splined spindle 9. An upper balancing cylinder 11 is provided on the outer circle of the upper spindle. A third O-ring 37 is installed between the upper balancing cylinder 11 and the upper spindle 10. A circulation hole 1001 is provided on the outer circle of the upper spindle, and a 1101 is provided on the upper balancing cylinder. A fourth O-ring 38 is installed between the upper balancing cylinder 11 and the pressure transmission stub 12.
[0055] Additionally, the outer circumference of the upper mandrel 10 is provided with a pressure transmission short section 12, an upper glue cylinder mandrel 14, and a test connector 16. The outer circumference of the right end of the pressure transmission short section 12 is connected to the left end of the upper glue cylinder assembly 13. The right end of the upper glue cylinder assembly 13 is connected to the upper sliding head connector 15. A thirty-sixth O-ring 52 is installed between the upper sliding head connector 15 and the upper glue cylinder assembly 13. The outer circumference of the upper mandrel 10 is provided with a pressure transmission hole 1002. The right end face of the pressure transmission short section 12 is provided with a pressure transmission channel 1201. A seventh O-ring is installed between the upper glue cylinder mandrel 14 and the upper sliding head connector 15. Ring 41, the glue-applying sleeve assembly 13, the glue-applying sleeve mandrel and the seventh O-ring 41 form an annular space 1301 for the glue-applying sleeve, the right end of the upper mandrel is connected to the extension shaft 18, the right end of the outer circle of the upper mandrel 10 is provided with a test hole 1003, the sixteenth and seventeenth O-rings 54 and 55 are installed between the upper mandrel 10 and the test connector 16, the thirty-seventh O-ring 53 is installed between the glue-applying sleeve mandrel 14 and the test connector 16, the right end of the extension shaft 18 is connected to the left end of the lower mandrel 20, the outer circle of the lower mandrel 20 is provided with a connecting connector 19 and a lower pressure transmission short section 7. 6. Lower glue cartridge mandrel 77; the outer circumference of the lower mandrel 20 is provided with a pressure transmission hole 2001; the 21st and 22nd O-rings 59 and 60 are installed between the lower mandrel 20, the connecting joint 19, and the lower pressure transmission short section 76; the 18th O-ring 56 is installed between the extension shaft 18 and the upper glue cartridge mandrel 14; the right end of the upper test joint is connected to the extension cylinder 17; the right end of the extension cylinder 17 is connected to the inner hole of the left end of the connecting joint 19; the right end of the connecting joint 19 is connected to the left end of the lower pressure transmission short section 76; the right end of the lower pressure transmission short section 76 is connected to the left end of the lower glue cartridge assembly 78. The lower rubber tube assembly 78 is connected to the lower sliding joint 79 at its right end. A twenty-sixth O-ring 64 is installed between the lower rubber tube spindle 77 and the lower sliding joint 79. The lower rubber tube assembly 78, the lower rubber tube spindle 77, and the twenty-sixth O-ring 64 form an annular space 7801 for the lower rubber tube. A twenty-third O-ring 61 and a twenty-fourth O-ring 62 are installed between the lower pressure transmission section 76 and the lower rubber tube assembly 78. A twenty-fifth O-ring 63 and a twenty-sixth O-ring 64 are installed between the lower sliding joint 79 and the lower rubber tube spindle 77 and the lower rubber tube assembly 78, respectively.
[0056] The right end of the lower spindle 20 is connected to the inner hole of the left end of the spindle connector 22. The lower spindle 20 is provided with a lower balance cylinder. The lower spindle 20 has a balance hole 2002 on its outer circle. The lower balance cylinder 21 has a balance channel 2101 on its outer side. The 28th, 29th, and 30th O-rings 66, 67, and 68 are installed between the lower spindle 20 and the lower balance cylinder.
[0057] The upper end of the shifting mandrel 2 is connected to the inner hole of the right end of the upper connector 1. An M-shaped shifting groove 201 is formed on the outer circular surface 202 of the shifting mandrel 2. The M-shaped shifting groove 201 has an initial position (pressurized position), a transition position, a circulation position, a test position, a balance position, and a preparation position. A grease injection short section 4, a shifting sleeve 6, and a splined outer cylinder 8 are provided outside the shifting mandrel 2 and connected to the splined mandrel 9. The splined mandrel 9 includes multiple radially outward-extending splines, which mesh with multiple radially inward-extending splines of the splined outer cylinder 8 to prevent rotational movement of the shifting mandrel 2. A grease injection plug 3 is provided on the outer circle of the grease injection short section, and a grease injection port is provided on the grease injection short section. Hole 401, the shift lug 7 is fixed on the shift sleeve 6, the shift mandrel 2 achieves non-rotating reciprocating motion of the working tube column through the shift lug 7 and the shift sleeve 6, the shift sleeve 6 is fixed inside the shift outer cylinder 5 by the grease injection short section 4, the spline outer cylinder 8 and the tapered roller bearing 46, and rotates, the spline mandrel 9 is connected to the upper mandrel 10, the upper mandrel 10 is connected to the extension shaft 18, the extension shaft 18 is connected to the lower mandrel 20, the lower mandrel 20 is connected to the mandrel connector 22, the shift spring 25 is disposed between the right end face 2201 of the outer circle of the step of the mandrel connector 22 and the left end face 2601 of the valve connector 26.
[0058] like Figure 1 , 2 As shown, the initial position (pressurized position) 2011 of the M-shaped transposition groove 201, the circulation hole 1001 is sealed by the third O-ring 37 and the twelfth O-ring 48, the second circulation channel 1101 is in a closed state, the pressurization hole 1002 is sealed by the fourteenth O-ring 50 and the fifteenth O-ring 51, and is connected to the pressurization channel 1201. The pressure enters the annular space 1301 of the glue-applying cylinder through the pressurization channel 1201, expanding the glue-applying cylinder assembly 13. The test hole 1003 is sealed by the fifteenth O-ring 51 and the sixteenth O-ring 48. O-ring 54 seals the test channel 1601, which is in a closed state. The pressure hole 2001 is sealed by the twenty-first O-ring 59 and the twenty-second O-ring 60, and is connected to the pressure channel 7601. The pressure enters the annular space 7801 of the lower rubber tube through the pressure channel 7601, expanding the lower rubber tube assembly 78. The balance hole 2002 is sealed by the twenty-second O-ring 60 and the twenty-eighth O-ring 66, which is in a closed state. The circulation hole 2801 is connected to the first circulation channel 2901.
[0059] like Figure 2 , 3As shown, at the transition position 2012 of the M-shaped transposition groove 201, the circulation hole 1001 is connected to the second circulation channel 1101. The pressure hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressure channel 1201. The test hole 1003 is connected to the test channel 1601. The pressure hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressure channel 7601. The balance hole 2002 is connected to the balance channel 2101. The radially outwardly extending boss 2402 of the valve spindle 24 pushes the left end face 2802 of the differential pressure piston 28 downward. The compression valve spring 30, the tenth O-ring 44 and the thirty-second O-ring 72 isolate the circulation hole 2801 from the first circulation channel 2901.
[0060] like Figure 2 , 4 As shown, the M-shaped transposition groove 201 is in the circulation position 2013. The circulation hole 1001 is connected to the second circulation channel 1101. The pressure hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressure channel 1201. The test hole 1003 is sealed by the fifteenth O-ring 51 and the sixteenth O-ring 54. The test channel 1601 is in the closed state. The pressure hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressure channel 7601. The balance hole 2002 is sealed by the twenty-second O-ring 60 and the twenty-eighth O-ring 66. The balance channel 2101 is in the closed state. The circulation hole 2801 is sealed by the tenth O-ring 44 and the thirty-second O-ring 72. The first circulation channel 2901 is in the closed state.
[0061] like Figure 2 , 5 As shown, at the test position 2014 of the M-shaped transposition groove 201, the circulation hole 1001 is sealed by the thirteenth O-ring 49 and the fourteenth O-ring 50, the second circulation channel 1101 is in a closed state, the pressure hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressure channel 1201, the test hole 1003 is connected to the test channel 1601, the pressure hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressure channel 7601, the balance hole 2002 is sealed by the twenty-ninth O-ring 67 and the thirtieth O-ring 68, the balance channel 2101 is in a closed state, the circulation hole 2801 is sealed by the tenth O-ring 44 and the thirty-second O-ring 72, and the first circulation channel 2901 is in a closed state.
[0062] like Figure 2 , 6As shown, the M-shaped transposition groove 201 is at its balance position 2015. The circulation hole 1001 is connected to the second circulation channel 1101. The pressure hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressure channel 1201. The test hole 1003 is connected to the test channel 1601. The pressure hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressure channel 7601. The balance hole 2002 is connected to the balance channel 2101. The circulation hole 2801 is sealed by the tenth O-ring 44 and the thirty-second O-ring 72. The first circulation channel 2901 is in a closed state.
[0063] like Figure 2 , 7 As shown, in the prepared position 2016 of the M-shaped transposition groove 201, the circulation hole 1001 is sealed by the thirteenth O-ring 49 and the fourteenth O-ring 50, the second circulation channel 1101 is in a closed state, the pressure hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressure channel 1201, the test hole 1003 is connected to the test channel 1601, the pressure hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressure channel 7601, the balance hole 2002 is sealed by the twenty-ninth O-ring 67 and the thirtieth O-ring 68, the balance channel 2101 is in a closed state, the circulation hole 2801 is sealed by the tenth O-ring 44 and the thirty-second O-ring 72, and the first circulation channel 2901 is in a closed state.
[0064] This utility model features a multi-cycle dual-seal packer with built-in bypass. It can be directly connected to conventional tubing to seal the production casing, or connected to continuous tubing through the production tubing to seal the production casing. More specifically, it includes a first circulation device, a switching device, a second circulation device, a testing device, and a balancing device. The switching device is used for the reciprocating motion of the telescopic mandrel, controlling the multi-cycle dual-seal packer connected to the tubing to repeatedly cycle vertically in the initial position (pressurized position), transition position, circulation position, testing position, balancing position, and preparation position without rotating the tubing string. The first circulation device is used for fluid circulation when the packer enters the wellbore, making it easier to lower the packer into the wellbore. This device has a pressure differential. The system consists of several parts: First, when the fluid velocity is sufficient, the first circulation position is closed. This position also pressurizes the rubber sleeve, causing it to expand and seal the casing. Second, after the rubber sleeve seals the casing, well fluid is allowed to circulate in the well from the second circulation position. In this case, the first circulation position and the pressurization port of the rubber sleeve are closed. Test position: In the test position, all circulation ports, balance ports, and pressurization ports are closed. The test port communicates with the annulus, allowing isolated formation fluid to enter the tubing from the test port. Balance position: In the balance position, the first and second circulation ports and the balance port at the lower end of the rubber sleeve are opened. The pressure at the upper and lower ends of the rubber sleeve is balanced, ensuring that the rubber sleeve can be unsealed smoothly without damage. The multi-circulation dual-sealing packer with built-in bypass can circulate fluid through its own circulation port, reducing the resistance of the work string during descent without the need for a separate circulation valve. Moreover, the unique M-shaped shift groove design allows for multiple-circulation interval operations of the work string with just simple lifting and lowering operations, without having to pull the work string out of the well. This reduces both the difficulty and cost of the operation.
[0065] The working process and principle of this utility model:
[0066] During the tool's descent, to reduce resistance, the first circulation channel is in the open position, and the fluid in the circulation well is as follows:
[0067] When the tool is lowered to the predetermined position, well fluid is pumped into the tubing. When the flow rate of the well fluid is sufficient, the differential pressure piston 28 compresses the valve spring 30 and moves. The tenth O-ring 44 passes through the circulation hole 2801 to close the circulation hole 2801 set on the outer circle of the differential pressure piston 28, and the first circulation hole is closed.
[0068] Continue pumping well fluid into the tubing. The upper and lower rubber sleeve assemblies 13 and 78 expand, sealing the casing and applying a certain weight to the working tubing string. The mandrel string moves downward, and the shift sleeve 6 rotates with the shift lug 7. The shift lug 7 moves along the shift groove 201, moving from the initial position to the transition position. The pressure holes 1002 and 2001 close, and the first circulation channel closes. During this process, the outwardly extending radial step 2402 of the valve mandrel 24 engages with the upper end face 2802 of the differential pressure piston 28, locking the circulation hole 2801 in the closed state, releasing the weight of the tubing string. The shift spring 25 pushes the mandrel string upward, and the shift sleeve 6 rotates with the shift lug 7 moving in the M-shaped shift groove. The shift lug 7 enters the circulation position, and the second circulation channel 1101 opens, allowing circulation of the annular space above the upper rubber sleeve assembly 13.
[0069] Apply a certain weight to the working tube column, the mandrel string moves downward, the transposition lug 7 will enter the test position again along the trajectory of the M-shaped transposition groove 201, the circulation hole 1001 passes through the thirteenth O-ring 49, and is closed by the thirteenth O-ring 49 and the fourteenth O-ring 50, and the test hole 1003 opens the test channel 1601 through the sixteenth O-ring 54.
[0070] The formation isolation zone is connected to the tubing, releasing the weight of the tubing string. The shifting spring 25 pushes the mandrel string upwards again, and the shifting lug 7 moves along the M-shaped shifting groove 201 into the balance position. As the mandrel string moves upwards, the circulation hole 1001 is opened through the second circulation channel 1101 after passing the thirteenth O-ring 49. The test hole 1003 remains open. The balance hole 2002 is located between the twenty-eighth O-ring 66 and the twenty-ninth O-ring 67. The balance channel 2101 is opened, and the upper and lower rubber sleeves... The pressure at the upper and lower ends of components 13 and 78 is balanced, applying weight to the working tubing string. The mandrel string moves downward, and the transposition lug 7 then enters the ready position of the M-shaped transposition groove. The weight of the tubing string is released again, and the transposition spring 25 pushes the mandrel string upward. The transposition lug 7 moves with the M-shaped transposition groove 201 and returns to its initial position. The pressure holes 1002 and 2001 open, and the upper and lower rubber sleeves are retracted. The operation is completed in one go. The working tubing string can be dragged to enter the upper section for operation without having to remove the working tubing string from the wellbore.
[0071] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of this utility model. Therefore, any improvements or modifications that those skilled in the art may make to certain parts of this utility model still embody the principles of this utility model and achieve its purpose, and all fall within the scope of protection of this utility model.
Claims
1. A multi-cycle double-seal packer with built-in bypass, characterized in that, include: The upper spindle (10), the lower spindle (20), and the valve spindle (24) are connected in sequence; One end of the upper spindle (10) is provided with a second circulation channel (1101), and the other end of the upper spindle (10) is provided with a test channel (1601). A second circulation mechanism is provided on the second circulation channel (1101), and a test mechanism is provided on the test channel (1601). A glue-filling mechanism is provided between the second circulation mechanism and the test mechanism. The lower mandrel (20) has a lower balancing channel (2101) at its end, and a lower balancing mechanism is provided on the lower balancing channel (2101); a lower rubber tube mechanism is provided between the lower balancing mechanism and the testing mechanism. The valve spindle (24) is provided with a first circulation channel (2901), and the first circulation channel (2901) is provided with a first circulation mechanism, which is connected to the lower balancing mechanism.
2. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, The upper spindle (10) is connected to a shift spindle (2), and a shift mechanism is installed on the shift spindle (2). The shift mechanism is connected to the second circulation mechanism. The shift spindle (2) is connected to the upper spindle (10) through a spline spindle (9). The outer circle of the spline spindle (9) is provided with a spline outer cylinder (8). The upper spindle (10) is connected to the lower spindle (20) through an extension shaft (18). The lower spindle (20) is connected to the valve spindle (24) through a spindle connector (22).
3. The multi-cycle dual-seal packer with built-in bypass according to claim 2, characterized in that, The outer circular surface (202) of the transposition mandrel (2) is provided with an M-shaped transposition groove (201). The M-shaped transposition groove (201) has an initial position (2011), a transition position (2012), a circulation position (2013), a test position (2014), a balance position (2015), and a preparation position (2016). The spline mandrel (9) includes multiple radially outward-extending splines, which mesh with multiple radially inward-extending splines of the spline outer cylinder (8) to prevent the transposition mandrel (2) from rotating.
4. The multi-cycle dual-seal packer with built-in bypass according to claim 2, characterized in that, The shifting mechanism includes: a grease injection short section (4) and a shifting sleeve (6) sleeved on the outside of the shifting mandrel (2); the end of the grease injection short section (4) is connected to the outer cylinder (5) of the shifting mandrel, the outer circle of the grease injection short section (4) is provided with a grease injection hole (401), and the grease injection hole (401) is filled with a grease plug (3); the outer circle of the steps at both ends of the shifting sleeve (6) is equipped with tapered roller bearings (46), the middle part of the shifting sleeve (6) is fixedly equipped with a shifting lug (7), and the shifting mandrel (2) performs a non-rotating reciprocating motion of the working tube column through the shifting lug (7) and the shifting sleeve (6).
5. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, The second circulation mechanism includes: an upper balance cylinder (11) and a pressure transmission short section (12) disposed on the outer circle of the upper spindle (10); the second circulation channel (1101) is disposed on the upper balance cylinder (11) and communicates with the inner cavity of the upper spindle (10); the upper spindle (10) is provided with a second circulation hole (1001) communicating with the upper balance cylinder (11) and a first pressure transmission hole (1002) communicating with the pressure transmission short section (12); the right end face of the pressure transmission short section (12) is provided with a pressure transmission channel (1201) communicating with the first pressure transmission hole (1002).
6. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, The glue-applying cylinder mechanism includes: a glue-applying cylinder spindle (14) fitted on an upper spindle (10), a glue-applying cylinder assembly (13) fitted on the glue-applying cylinder spindle (14), and an upper sliding joint (15) installed at the other end of the glue-applying cylinder assembly (13); the left end of the glue-applying cylinder spindle (14) is connected to the first pressure transmission hole (1002), and the glue-applying cylinder assembly (13), the glue-applying cylinder spindle (14) and the upper sliding joint (15) form an annular space (1301) for the glue-applying cylinder.
7. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, The testing mechanism includes: a test connector (16) installed on the upper spindle (10), a test hole (1003) connected to the test connector (16) is opened at the right end of the outer circle of the upper spindle (10), and the test channel (1601) is set on the test connector (16).
8. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, The lower glue tube mechanism includes: a lower pressure transmission short section (76) of a connecting joint (19) installed sequentially on the outer circle of the end of the lower spindle (20), and a lower glue tube spindle (77). The inner hole at the left end of the connecting joint is connected to the testing mechanism. The outer circle of the lower spindle (20) is provided with a second pressure transmission hole (2001) that communicates with the lower pressure transmission short section (76). A lower glue tube assembly (78) is installed on the outside of the lower glue tube spindle (77). The right end of the lower pressure transmission short section (76) is connected to the left end of the lower glue tube assembly (78). The right end of the lower glue tube assembly (78) is connected to a lower sliding joint (79). The lower glue tube assembly (78), the lower glue tube spindle (77), and the lower sliding joint (79) form an annular space (7801) of the lower glue tube.
9. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, The lower balancing mechanism includes: a lower balancing cylinder (21) installed at the end of the lower spindle (20), and a spring outer cylinder (23) connected to the right end of the lower balancing cylinder (21); the lower spindle (20) has a balancing hole (2002) on its outer circle that communicates with the lower balancing cylinder (21).
10. The multi-cycle dual-seal packer with built-in bypass according to claim 1, characterized in that, A shifting spring (25) is provided outside the valve spindle (24). The outer sleeve (23) of the shifting spring (25) is fixedly installed. The end of the shifting spring (25) is connected to a valve connector (26), a piston cylinder (27), a differential pressure piston (28), a valve spring (30), and a guide shoe (32). A circulation outer sleeve (29) is installed outside the valve spring (30). The radially outwardly extending boss (2402) of the valve spindle (24) is connected to the differential pressure piston (28). The left end face (2802) is in contact with the first circulation channel (2901) and the first circulation hole (2801) is provided on the outer circulation cylinder (29). The first circulation hole (2801) cooperates with the first circulation channel (2901). The valve spring (30) is provided between the lower end face (2803) of the differential pressure piston (28) and the stepped end face (2902) of the left end inner hole of the outer circulation cylinder (29).