Multiple-circulation double-seal packer with bypass

Abstract

The invention provides a multi-circulation double-seal packer with a bypass. The multi-circulation double-seal packer comprises an upper mandrel, a lower mandrel and a valve mandrel which are sequentially connected. Two ends of the upper mandrel are respectively provided with a second circulation channel and a test channel, the second circulation channel is provided with a second circulation mechanism, and the test channel is provided with a test mechanism; an upper rubber sleeve mechanism is arranged between the second circulating mechanism and the testing mechanism; a lower balance channel is formed in the tail end of the lower mandrel, and a lower balance mechanism is arranged on the lower balance channel; a lower rubber sleeve mechanism is arranged between the lower balance mechanism and the testing mechanism; the first circulation channel is arranged on the valve core shaft, the first circulation channel is provided with the first circulation mechanism, due to the circulation mechanism, lowering resistance of the operation tubular column is reduced, a circulation valve does not need to be independently connected, and the operation tubular column can conduct interval operation of multiple times of circulation only through simple operation of lifting and lowering. And the operation tubular column does not need to be lifted out of the well, so that the operation difficulty is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum equipment, in particular to a multi-circulation double-seal packer with a bypass. Background Art

[0002] The tubing packer is a downhole tool connected to the downhole tubing string and used to isolate the annular space between the tubing and the casing of the oil and gas well or the open hole wall. The shortcomings of the continuous tubing packers currently used in the market are: 1. When working downhole, a set of tools with a circulation channel needs to be connected; 2. They are all ordinary single seals, and multiple sets of packers are required to be used in conjunction to complete the interval operation; 3. After completing an interval operation, the packer needs to be recovered, pulled out of the wellbore, and reset, and it cannot be recycled multiple times. Summary of the invention

[0003] In view of the above defects or shortcomings, the object of the present invention is to provide a multi-cycle double-seal packer with a bypass.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A multi-cycle double-seal packer with a bypass, comprising: an upper spindle, a lower spindle, and a valve spindle connected in sequence;

[0006] A second circulation channel is provided at one end of the upper spindle, a test channel is provided at the other end of the upper spindle, a second circulation mechanism is provided on the second circulation channel, and a test mechanism is provided on the test channel; a glue cylinder mechanism is provided between the second circulation mechanism and the test mechanism;

[0007] A lower balancing channel is provided at the end of the lower spindle, and a lower balancing mechanism is provided on the lower balancing channel; a lower rubber cylinder mechanism is provided between the lower balancing mechanism and the testing mechanism;

[0008] The valve core shaft is provided with a first circulation channel, the first circulation channel is provided with a first circulation mechanism, and the first circulation mechanism is connected with the lower balancing mechanism.

[0009] The upper spindle is connected to a transposition spindle, a transposition mechanism is installed on the transposition spindle, and the transposition mechanism is connected to the second circulation mechanism; the transposition spindle and the upper spindle are connected via a spline spindle, a spline outer cylinder is provided on the outer circle of the spline spindle, the upper spindle and the lower spindle are connected via an extension shaft, and the lower spindle and the valve spindle are connected via a spindle connector.

[0010] An M-shaped transposition groove is provided on the outer circular surface of the transposition spindle, and 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 spindle includes a plurality of splines extending radially outward, and the splines are engaged with a plurality of splines extending radially inward on the spline outer cylinder to prevent the transposition spindle from rotating.

[0011] The transposition mechanism comprises: a grease injection nipple and a transposition sleeve which are sleeved on the outside of the transposition mandrel; the end of the grease injection nipple is connected to the outer cylinder of the transposition chamber, the outer circle of the grease injection nipple is provided with a grease injection hole, and a grease injection plug is installed in the grease injection hole; tapered roller bearings are installed on the stepped outer circle at both ends of the transposition sleeve, and a transposition lug is fixedly installed in the middle of the transposition sleeve, and the transposition mandrel performs a reciprocating motion of the working pipe string without rotating through the transposition lug and the transposition sleeve.

[0012] The second circulation mechanism includes: an upper balancing cylinder and a pressure transmission short section arranged on the outer circle of the upper spindle; the second circulation channel is arranged on the upper balancing cylinder and is connected with the inner cavity of the upper spindle; the upper spindle is provided with a second circulation hole connected with the upper balancing cylinder and a first pressure transmission hole connected with the pressure transmission short section; the right end face of the pressure transmission short section is provided with a pressure transmission channel connected with the first pressure transmission hole.

[0013] The glue cylinder mechanism includes: a glue cylinder spindle sleeved on the upper spindle, a glue cylinder assembly sleeved on the glue cylinder spindle, and an upper sliding joint installed on the other end of the glue cylinder assembly; the left end of the glue cylinder spindle is connected to the pressure transmission hole, and the glue cylinder assembly, the glue cylinder spindle and the upper sliding head form an annular space.

[0014] The testing mechanism comprises: a testing joint installed on the upper spindle, a testing hole connected to the testing joint is opened at the right end of the outer circle of the upper spindle, and the testing channel is arranged on the testing joint.

[0015] The lower rubber cylinder mechanism includes: a connecting joint, a lower pressure transmission nipple, and a lower rubber cylinder spindle, which are sequentially installed on the outer circle of the end of the lower spindle, and the inner hole at the left end of the connecting joint is connected to the testing mechanism; the outer circle of the lower spindle is provided with a second pressure transmission hole connected to the lower pressure transmission nipple; a lower rubber cylinder assembly is installed outside the lower rubber cylinder spindle, the right end of the lower pressure transmission nipple is connected to the left end of the lower rubber cylinder assembly, and the right end of the lower rubber cylinder assembly is connected to a lower sliding joint, and the lower rubber cylinder assembly, the lower rubber cylinder spindle and the lower sliding joint form an annular space.

[0016] The lower balancing mechanism comprises: a lower balancing cylinder installed at the end of the lower spindle, the right end of the lower balancing cylinder is connected to a spring outer cylinder; the outer circle of the lower spindle is provided with a balancing hole connected to the lower balancing cylinder.

[0017] A shift spring is arranged outside the valve core shaft, and the shift spring and spring outer cylinder are fixedly installed, and the end of the shift spring is connected to a valve joint, a piston cylinder, a differential piston, a valve spring, and a guide shoe; a circulation outer cylinder is installed outside the valve spring, and the radially outward extending boss of the valve core shaft is in contact with the left end face of the pressure difference piston; the circulation channel is arranged on the circulation outer cylinder, and a first circulation hole is opened on the differential piston, and the first circulation hole cooperates with the circulation channel; the valve spring is arranged between the lower end face of the pressure difference piston and the step end face of the inner hole at the left end of the circulation outer cylinder.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The present invention provides a multi-circulation double-seal packer with bypass. Since the design of the first circulation device provides a circulation port, the packer can be smoothly lowered to reduce resistance and circulate the fluid in the well. The operating pipe string is lowered to a predetermined position, and well fluid is pumped into the oil pipe. When the well fluid is pumped in at a sufficient speed, the circulation hole is closed, and the upper and lower rubber tubes expand to isolate the oil layer to be isolated. The operating pipe string is lowered, and the weight of the operating pipe string is used to close the pressure hole and lock the first circulation position in the closed position without rotating the operating pipe string. After completing an interval operation, a second interval operation can be performed without re-extracting the wellbore, and the cycle is repeated. The second circulation device defines the circulation hole of the upper mandrel and the circulation hole of the outer tube. Annular hole, when the circulation hole of the upper mandrel is in the circulation position, the second circulation channel is in a connected state, and the annulus above the upper rubber cylinder assembly can be circulated. The test device includes a test hole that defines the upper mandrel and a test hole of the test outer cylinder. When the test hole of the upper mandrel is in the test position, the test channel is in a connected state, and the liquid in the test hole will enter the tubing path through the test hole. In this state, the first circulation device, the second circulation device and the balancing device are all in a closed state; the balancing device includes a state that the second circulation channel and the test channel are opened, and the channel between the lower end balancing outer cylinder and the lower mandrel balancing hole is opened to balance the pressure difference between the upper and lower rubber cylinders, so as to facilitate the unsealing of the packer and prevent damage to the rubber cylinder. The multiple-cycle double-seal packer connected by continuous tubing makes up for the shortcomings of the current continuous tubing packers on the market in multiple circulation interval operations, and reduces the difficulty and cost of interval operations.

[0020] Furthermore, in the present invention, the design of the transposition device provides a transposition lug and an M-shaped transposition groove, the M-shaped transposition groove is arranged on the outer surface of the transposition mandrel, the transposition lug is fixed in the transposition sleeve, and the mandrel string and the transposition sleeve can interact with each other, the mandrel string can reciprocate up and down, and the transposition sleeve can rotate, so that the mandrel string can cyclically move between the initial position (pressurized position), transition position, circulation position, test position, balance position, and preparation position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the structure of the multi-cycle double-seal packer with bypass of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the M-type transposition groove of the present invention;

[0023] Figure 3 This is a schematic diagram of the working state structure of the present invention Figure 1 ;

[0024] Figure 4 This is a schematic diagram of the working state structure of the present invention Figure 2 ;

[0025] Figure 5 This is a schematic diagram of the working state structure of the present invention Figure 3 ;

[0026] Figure 6 This is a schematic diagram of the working state structure of the present invention Figure 4 ;

[0027] Figure 7 This is a schematic diagram of the working state structure of the present invention Figure 5 .

[0028] In the figure, 1 is the upper joint; 2 is the transposition spindle; 3 is the grease plug; 4 is the grease nipple; 5 is the transposition outer cylinder; 6 is the transposition sleeve; 7 is the transposition lug; 8 is the spline outer cylinder; 9 is the spline shaft; 10 is the upper spindle; 11 is the upper balance cylinder; 12 is the pressure-uploading nipple; 13 is the upper rubber cylinder assembly; 14 is the upper rubber cylinder spindle; 15 is the upper sliding joint; 16 is the test joint; 17 is the extension cylinder: 18 is the extension shaft; 19 is the connecting joint: 20 is the lower spindle; 21 is the lower balance cylinder; 22 is the spindle connecting head; 23 is the spring outer cylinder; 24 is the valve spindle; 25 is the transposition spring; 26 is the valve joint; 27 is the piston cylinder; 28 is the pressure difference piston; 29 is the circulation outer cylinder; 30 is the valve spring; 31 is the plugging head; 32 is the guide shoe; 33 is the 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—tapered 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; 6 0—22nd O-ring; 61—23rd O-ring; 62—24th O-ring; 63—25th O-ring; 64—26th O-ring; 65—27th O-ring; 66—28th O-ring; 67—29th O-ring; 68—30th O-ring; 69—38th O-ring; 70—39th O-ring; 71—31st O-ring; 72—32nd O-ring; 73—33rd O-ring; 74—support seal; 75—34th O-ring; 76—lower pressure transmission nipple; 77—lower rubber cartridge spindle; 78—lower rubber cartridge assembly; 79—lower sliding joint; 201—M-type transposition groove; 202—outer surface of transposition spindle; 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—annular space of the upper rubber cylinder; 1601—test channel; 2001—pressurization 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 mandrel connecting shaft step; 2401—first circulation port; 2402—right end face of the radially outward extending boss; 2601—left end face of the valve joint; 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 at the left end of the circulation outer cylinder; 7801—annular space of the lower rubber cylinder. ; DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0030] like Figure 1 , 2 As shown, the present invention provides a multi-cycle dual-seal packer with self-contained bypass, comprising: an upper mandrel 10, a lower mandrel 20, and a valve mandrel 24 connected in sequence;

[0031] A second circulation channel 1101 is provided at one end of the upper spindle 10, and a test channel 1601 is provided at the other end of the upper spindle 10. 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 cylinder mechanism is provided between the second circulation mechanism and the test mechanism;

[0032] A lower balancing channel 2101 is provided at the end of the lower spindle 20, and a lower balancing mechanism is provided on the lower balancing channel 2101; a lower rubber cylinder mechanism is provided between the lower balancing mechanism and the testing mechanism;

[0033] The valve core shaft 24 is provided with a first circulation channel 2901 , and the first circulation channel 2901 is provided with a first circulation mechanism, and the first circulation mechanism is connected to the lower balancing mechanism.

[0034] Preferably, the upper spindle 10 is connected with a transposition spindle 2, a transposition mechanism is installed on the transposition spindle 2, and the transposition mechanism is connected to the second circulation mechanism; the transposition spindle 2 is connected to the upper spindle 10 through a spline spindle 9, and 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, and the lower spindle 20 is connected to the valve spindle 24 through a spindle connector 22. The transposition spindle 2 is installed with an upper joint 1.

[0035] In addition, if Figure 3As shown, the outer cylindrical surface 202 of the transposition spindle 2 is provided with an M-shaped transposition groove 201, and 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 spindle 9 includes a plurality of splines extending radially outward, and the splines are engaged with a plurality of splines extending radially inward on the spline outer cylinder 8 to prevent the transposition spindle 2 from rotating.

[0036] In the present invention, the transposition mechanism comprises: a grease injection nipple 4 and a transposition sleeve 6 sleeved on the outside of the transposition mandrel 2; the end of the grease injection nipple 4 is connected to the transposition chamber outer cylinder 5, and the outer circle of the grease injection nipple 4 is provided with a grease injection hole 401, and the grease injection hole 401 is provided with a grease injection plug 3. Among them, the stepped outer circle at both ends of the transposition sleeve 6 is provided with a tapered roller bearing 46, and the middle part of the transposition sleeve 6 is fixedly provided with a transposition lug 7, and the transposition mandrel 2 performs a reciprocating motion with the transposition sleeve 6 without rotating the working pipe string through the transposition lug 7.

[0037] The second circulation mechanism comprises:

[0038] An upper balancing cylinder 11 and a pressure transmission short section 12 are arranged on the outer circle of the upper core shaft 10; the second circulation channel 1101 is arranged on the upper balancing cylinder 11, and is connected with the inner cavity of the upper core shaft 10; the upper core shaft 10 is provided with a second circulation hole 1001 connected with the upper balancing cylinder 11, and a first pressure transmission hole 1002 connected 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 connected with the first pressure transmission hole 1002.

[0039] The glue cylinder mechanism comprises:

[0040] The upper glue cylinder spindle 14 is sleeved on the upper spindle 10 , and the upper glue cylinder assembly 13 is sleeved on the upper glue cylinder spindle 14 . The other end of the upper glue cylinder assembly 13 is installed with an upper sliding joint 15 . The left end of the upper glue cylinder spindle 14 is connected to the pressure transmission hole 1002 .

[0041] The testing organization includes:

[0042] The test connector 16 is mounted on the upper spindle 10 . A test hole 1003 communicating with the test connector 16 is opened at the right end of the outer circle of the upper spindle 10 . The test channel 1601 is arranged on the test connector 16 .

[0043] The lower rubber cylinder mechanism comprises:

[0044] The lower pressure transmission nipple 76 and the lower rubber cylinder spindle 77 of the connecting joint 19 are sequentially installed on the outer circle of the end 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 circle of the lower spindle 20 is provided with a second pressure transmission hole 2001 connected to the lower pressure transmission nipple 76; the lower rubber cylinder spindle 77 is externally installed with a lower rubber cylinder assembly 78, the right end of the lower pressure transmission nipple 76 is connected to the left end of the lower rubber cylinder assembly 78, and the right end of the lower rubber cylinder assembly 78 is connected to a lower sliding joint 79, and the lower rubber cylinder assembly 78, the lower rubber cylinder spindle 77 and the lower sliding joint 79 form an annular space 7801. A pressurizing channel 7601 is provided in the lower pressure transmission nipple 76. The connecting joint 19 is connected to the testing mechanism through an extension shaft 18, and an extension cylinder 17 is provided on the extension shaft 18, and the right end of the extension cylinder 17 is connected to the inner hole at the left end of the connecting joint 19.

[0045] The lower balancing mechanism comprises:

[0046] A lower balancing cylinder 21 is installed at the end of the lower spindle 20, and a spring outer cylinder 23 is connected to the right end of the lower balancing cylinder 21; a balancing hole 2002 connected to the lower balancing cylinder 21 is opened on the outer circle of the lower spindle 20, and a twenty-seventh O-ring 65 is installed between the lower balancing cylinder 21 and the lower rubber cylinder spindle 77.

[0047] The valve core shaft 24 is provided with a transposition spring 25 outside, the transposition spring 25 spring outer cylinder 23 is fixedly installed, and the end of the transposition spring 25 is connected with a valve joint 26, a piston cylinder 27, a differential piston 28, a valve spring 30, and a guide shoe 32; the valve spring 30 is provided with a circulation outer cylinder 29 outside, and the radially outward extending boss 2402 of the valve core shaft 24 contacts the left end surface 2802 of the differential pressure piston 28; the circulation channel 2901 is provided on the circulation outer cylinder 29, and the differential piston 28 is provided with a first circulation hole 2801, and the first circulation hole 2801 cooperates with the circulation channel 2901. The valve spring 30 is provided between the lower end surface 2803 of the differential pressure piston 28 and the step end surface 2902 of the inner hole at the left end of the circulation outer cylinder 29.

[0048] In the specific structure, the present invention includes an upper joint 1, the right end of the upper joint 1 is connected to a transposition spindle 2, the outside of the transposition spindle 2 is 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 chamber, the outer circle of the step at both ends of the transposition sleeve 6 is equipped with a tapered roller bearing 46, the right end of the transposition spindle 2 is connected to a spline spindle 9, the outer circle of the spline spindle 9 is provided with a spline outer cylinder 8, the left end of the spline outer cylinder 8 is connected to the right end of the transposition chamber cylinder 5, the right end of the spline spindle 9 is connected to an upper spindle 10, the outer circle of the upper spindle 10 is provided with an upper balancing cylinder 11, a pressure transmission short section 12, a rubber cylinder spindle 14, and a test joint 16, the upper balancing cylinder 11 The left end is connected to the right end of the spline 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 cylinder assembly 13, the right end of the upper rubber cylinder assembly 13 is connected to the right end of the sliding joint 15, the left end of the rubber cylinder spindle 14 is connected to the inner hole of the right end of the pressure transmission short section 12, the right end of the rubber cylinder spindle 14 is connected to the test joint 16, the right end of the upper spindle 10 is connected to the left end of the extension shaft 18, the extension shaft 18 is provided with an extension cylinder 17, 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, and the right end of the connecting joint 19 is connected to the left end of the pressure transmission short section 76 The right end of the extension shaft 18 is connected to the lower spindle 20, and a lower rubber cylinder spindle 77 is arranged outside the lower spindle 20. The left end of the lower rubber cylinder spindle 77 is threadedly connected to the inner hole of the right end of the lower pressure transmission short section 76, and the right end of the lower rubber cylinder spindle 77 is connected to the left end of the lower balance cylinder 21. A lower rubber cylinder assembly 78 is arranged outside the lower rubber cylinder spindle 77, and the left end of the lower rubber cylinder assembly 77 is externally threadedly connected to the right end of the lower pressure transmission short section 76, and the right end of the lower rubber cylinder assembly 78 is connected to the left end of the lower sliding joint 79, and the right end of the lower balance cylinder 21 is connected to the left end of the spring outer cylinder 23, and the right end of the lower spindle 20 is connected to the left end of the spindle connector 22, and the right end of the spindle connector 22 is connected to the valve The left end of the core shaft 24 is connected, and a transposition spring 25, a spring outer tube 23, a valve joint 26, a differential piston 28, a piston cylinder 27, a valve spring 30, a circulation outer tube 29, and a guide shoe 32 are arranged outside the valve core shaft. The right end of the spring outer tube 23 is connected to the left end of the valve joint 26, the right end of the valve joint 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 tube 29, the right end of the circulation outer tube 29 is connected to the left end of the guide shoe 32, the inner hole at the right end of the valve core shaft 24 is connected to the left end of the plug head 31, a thirty-third O-ring 73 is installed between the circulation outer tube 29 and the plug head 31, and a thirty-fourth O-ring 75 is installed between the circulation outer tube 29 and the guide shoe 32.

[0049] The left end of the valve core shaft 24 is connected to the core shaft connecting shaft 22, and the right end is connected to the plug head 31. The valve core shaft 24 is provided with a valve joint 26, a pressure difference piston 28, and a valve spring 30. A thirty-first O-ring 71 is installed between the valve core shaft 24 and the valve joint 26. The right end of the valve joint is connected to the inner hole at the left end of the piston cylinder 27. The right end of the piston cylinder 27 is connected to the inner hole at the left end of the circulation outer cylinder 29. A ninth O-ring 43 is installed between the piston cylinder 27 and the pressure difference piston 28. A third O-ring 44 and 72 are installed between the pressure difference piston 28 and the circulation outer cylinder 29. The valve spring 30 is arranged between the lower end face 2803 of the pressure difference piston 28 and the step end face 2902 of the inner hole at the left end of the circulation outer cylinder 29. The thirty-eighth and thirty-ninth O-rings 69 and 70 are installed between the core shaft connecting shaft 22 and the valve core shaft 24, and the thirty-first O-ring 71 is installed between the valve joint 26 and the valve core shaft 24.

[0050] The upper end of the transposition spindle 2 is connected to the inner hole of the right end of the upper joint 1, and an M-shaped transposition groove 201 is opened on the outer circumferential surface 202 of the transposition spindle 2. The M-shaped transposition groove 201 has an initial position, a pressurization position, a transition position, a circulation position, a test position, a balance position, and a preparation position. The transposition spindle 2 is provided with a grease injection short section 4, a transposition sleeve 6 and a spline outer cylinder 8 connected with a spline spindle 9. The spline spindle 9 includes a plurality of splines extending radially outward, and these keys are engaged with a plurality of splines extending radially inward of the spline outer cylinder 8 to prevent the transposition spindle 2 from rotating. 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 transposition lug 7 is fixed on the transposition sleeve 6. The mandrel 2 realizes the reciprocating motion of the working pipe string without rotation through the transposition lug 7 and the transposition sleeve 6. The transposition sleeve 6 is fixed in the outer cylinder 5 of the transposition chamber by the grease injection short section 4, the spline outer cylinder 8 and the tapered roller bearing 46, and performs rotational motion. The spline mandrel 9 is connected with the upper mandrel 10, the upper mandrel 10 is connected with the extension shaft 18, the extension shaft 18 is connected with the lower mandrel 20, the lower mandrel 20 is connected with the mandrel connector 22, the transposition spring 25 is arranged between the right end face 2201 of the stepped outer circle of the mandrel connector 22 and the left end face 2601 of the valve joint 26, a first O-ring 35 is installed between the grease injection short section 4 and the transposition mandrel 2, and a second O-ring 36 is installed between the spline mandrel 9 and the transposition mandrel 2.

[0051] The left end of the upper spindle 10 is connected to the inner hole of the right end of the spline spindle 9, the outer circle of the upper spindle is provided with an upper balance cylinder 11, a third O-ring 37 is installed between the upper balance cylinder 11 and the upper spindle 10, the outer circle of the upper spindle is provided with a circulation hole 1001, and the upper balance cylinder is provided with 1101. A fourth O-ring 38 is installed between the upper balance cylinder 11 and the pressure transmission nipple 12.

[0052] In addition, the outer circle of the upper spindle 10 is provided with a pressure transmission short section 12, an upper rubber cylinder spindle 14, and a test joint 16. The outer circle of the right end step of the upper pressure transmission short section 12 is connected to the left end of the upper rubber cylinder assembly 13, and the right end of the upper rubber cylinder assembly 13 is connected to the upper sliding joint 15. A thirty-sixth O-ring 52 is installed between the upper sliding joint 15 and the upper rubber cylinder assembly 13. The outer circle of the upper spindle 10 is provided with a pressure transmission hole 1002, and the right end face of the upper pressure transmission short section 12 is provided with a pressure transmission channel 1201. The seventh O-ring 52 is installed between the upper rubber cylinder spindle 14 and the upper sliding joint 15. The O-ring 41, the upper rubber cylinder assembly 13, the upper rubber cylinder spindle and the seventh O-ring 41 form an annular space 1301, the right end of the upper spindle is connected to the extension shaft 18, the outer circle right end of the upper spindle 10 is provided with a test hole 1003, the sixteenth and seventeenth O-rings 54 and 55 are installed between the upper spindle 10 and the test joint 16, the thirty-seventh O-ring 53 is installed between the upper rubber cylinder spindle 14 and the test joint 16, the right end of the extension shaft 18 is connected to the left end of the lower spindle 20, the outer circle of the lower spindle 20 is provided with a connecting joint 19 and a lower pressure transmission short joint 7 6. Lower rubber cylinder spindle 77, the outer circle of the lower spindle 20 is provided with a pressure transmission hole 2001, the 21st and 22nd O-rings 59 and 60 are installed between the lower spindle 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 rubber cylinder spindle 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, and the right end of the lower pressure transmission short section 76 is connected to the lower rubber cylinder assembly 78 At the left end, the right end of the lower rubber cylinder assembly 78 is connected to the lower sliding joint 79, and a twenty-sixth O-ring 64 is installed between the lower rubber cylinder spindle 77 and the lower sliding joint 79. The lower rubber cylinder assembly 78, the lower rubber cylinder spindle 77 and the twenty-sixth O-ring 64 form an annular space 7801, and a twenty-third O-ring 61 and a twenty-fourth O-ring 62 are installed between the lower pressure transmission short section 76 and the lower rubber cylinder assembly 78, and 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 cylinder spindle 77 and the lower rubber cylinder assembly 78, respectively.

[0053] 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 balancing cylinder. A balancing hole 2002 is provided on the outer circle of the lower spindle 20. A balancing channel 2101 is provided on the outside of the lower balancing cylinder 21. The twenty-eighth, twenty-ninth and thirtieth O-rings 66, 67 and 68 are installed between the lower spindle 20 and the lower balancing cylinder.

[0054] The upper end of the transposition spindle 2 is connected to the inner hole of the right end of the upper joint 1, and an M-shaped transposition groove 201 is provided on the outer circumferential surface 202 of the transposition spindle 2. The M-shaped transposition groove 201 has an initial position (pressurization position), a transition position, a circulation position, a test position, a balance position, and a preparation position. The transposition spindle 2 is provided with a grease injection short section 4, a transposition sleeve 6 and a spline outer cylinder 8 connected with a spline spindle 9. The spline spindle 9 includes a plurality of splines extending radially outward, which are engaged with a plurality of splines extending radially inwardly of the spline outer cylinder 8 to prevent the transposition spindle 2 from rotating. A grease injection plug 3 is provided on the outer circumference of the grease injection short section, and a grease injection plug 3 is provided on the grease injection short section. Hole 401, the transposition lug 7 is fixed on the transposition sleeve 6, the transposition spindle 2 realizes the reciprocating motion of the working pipe string without rotation through the transposition lug 7 and the transposition sleeve 6, the transposition sleeve 6 is fixed in the outer cylinder 5 of the transposition chamber by the grease injection short section 4, the spline outer cylinder 8 and the tapered roller bearing 46, and makes rotational motion, the spline spindle 9 is connected with the upper spindle 10, the upper spindle 10 is connected with the extension shaft 18, the extension shaft 18 is connected with the lower spindle 20, the lower spindle 20 is connected with the spindle connector 22, and the transposition spring 25 is arranged between the right end face 2201 of the stepped outer circle of the spindle connector 22 and the left end face 2601 of the valve joint 26.

[0055] like Figure 1 , 2 As shown, the initial position (pressurization 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 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 through the pressurization channel 1201, expands the upper rubber cylinder assembly 13, and the test hole 1003 is sealed by the fifteenth O-ring 51 and the sixteenth O-ring 52. The O-ring 54 is sealed, the test channel 1601 is in a closed state, the pressurizing hole 2001 is sealed by the twenty-first O-ring 59 and the twenty-second O-ring 60, and is connected to the pressurizing channel 7601. The pressure enters the annular space 7801 through the pressurizing channel 7601, expands the lower rubber cylinder assembly 78, 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 a closed state, and the circulation hole 2801 is connected to the circulation channel 2901.

[0056] 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 circulation channel 1101, the pressurizing hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressurizing channel 1201, the test hole 1003 is connected to the test channel 1601, the pressurizing hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressurizing channel 7601, the balance hole 2002 is connected to the balance channel 2101, and the radially outward extending boss 2402 of the valve core shaft 24 pushes the left end face 2802 of the pressure difference piston 28 downward, compressing the valve spring 30, the tenth O-ring 44 and the thirty-second O-ring 72 isolate the circulation hole 2801 from the circulation channel 2901.

[0057] like Figure 2 , 4 As shown, at the circulation position 2013 of the M-shaped transposition groove 201, the circulation hole 1001 is connected to the circulation channel 1101, the pressurizing hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressurizing 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 a closed state, the pressurizing hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressurizing 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 a closed state, the circulation hole 2801 is sealed by the tenth O-ring 44 and the thirty-second O-ring 72, and the circulation channel 2901 is in a closed state.

[0058] 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 circulation channel 1101 is in a closed state, the pressurizing hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressurizing channel 1201, the test hole 1003 is connected to the test channel 1601, the pressurizing hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressurizing 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 circulation channel 2901 is in a closed state.

[0059] like Figure 2 , 6As shown, the M-shaped transposition groove 201 is in the equilibrium position 2015, the circulation hole 1001 is connected with the circulation channel 1101, the pressurizing hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressurizing channel 1201, the test hole 1003 is connected with the test channel 1601, the pressurizing hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressurizing channel 7601, the balance hole 2002 is connected with the balance channel 2101, the circulation hole 2801 is sealed by the tenth O-ring 44 and the thirty-second O-ring 72, and the circulation channel 2901 is in a closed state,

[0060] like Figure 2 , 7 As shown, the M-shaped transposition groove 201 is in the preparation position 2016, the circulation hole 1001 is sealed by the thirteenth O-ring 49 and the fourteenth O-ring 50, the circulation channel 1101 is in a closed state, the pressurizing hole 1002 is sealed by the fifteenth O-ring 51 and isolated from the pressurizing channel 1201, the test hole 1003 is connected to the test channel 1601, the pressurizing hole 2001 is sealed by the twenty-second O-ring 60 and isolated from the pressurizing 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 circulation channel 2901 is in a closed state.

[0061] The multi-cycle double-seal packer with bypass of the present invention can be directly connected to a conventional oil pipe to seal the production casing, and can also be connected to a continuous oil pipe through the production oil pipe to seal the production casing. More specifically, it includes a first circulation device, a transposition device, a second circulation device, a testing device, and a balancing device; the transposition device is used for the reciprocating movement of the telescopic mandrel to control the multi-cycle double-seal packer connected to the oil pipe to be located at the initial position (pressurized position), transition position, circulation position, testing position, balancing position, and preparation position for multiple repeated cycles of vertical operation without rotating the pipe string; the first circulation device is used for fluid circulation of the packer when it enters the wellbore, so that the packer can be lowered into the wellbore more easily, and the device has a pressure difference piston , when the fluid speed is sufficient, the first circulation position will be closed, and this position can also pressurize the rubber tube to cause the rubber tube to expand and seal the casing; the second circulation device is that after the rubber tube seals the casing, the well fluid can be allowed to circulate in the well from the second circulation position. In this case, the first circulation position and the pressurized hole of the rubber tube are both in a closed state; the test device, when in the test position, all the circulation holes, balance holes and pressurized holes are in a closed state, the test hole and the annulus are communicated, and the isolated formation fluid will enter the oil pipe from the test hole; the balance device, in the balance position, the first and second circulation holes and the balance hole at the lower end of the rubber tube are opened, and the pressure at the upper and lower ends of the rubber tube will be balanced, thereby ensuring that the rubber tube can be unsealed smoothly without damaging the rubber tube. The multi-cycle double-seal packer with built-in bypass can circulate fluid through its own circulation hole to reduce the lowering resistance of the working string without the need to connect a separate circulation valve. In addition, the unique M-shaped transposition groove design allows the working string to perform multiple cycle interval operations with simple operations of lifting and lowering, without the need to lift the working string out of the well, which reduces the difficulty of the operation and reduces the cost of the operation.

[0062] The working process and principle of the present invention:

[0063] During the lowering of the tool, in order to reduce the resistance of the tool during the lowering process, the first circulation channel is in the open position to circulate the fluid in the well:

[0064] When the tool is lowered to a predetermined position, well fluid is pumped into the oil pipe. When the flow rate of the well fluid is sufficient, the pressure difference piston 28 compresses the valve spring 30 to move, and the tenth O-ring 44 passes through the circulation hole 2901 to close the circulation hole 2801 set on the outer circle of the pressure difference piston 28, and the first circulation hole is closed;

[0065] Continue to pump well fluid into the oil pipe, the upper and lower rubber cylinder components 13, 78 expand, the sealing casing, and a certain weight is applied to the working pipe string. The mandrel string moves downward, and the transposition sleeve 6 rotates with the transposition lug 7. The transposition lug 7 moves along the transposition groove 201 and moves from the initial position to the transition position. The pressurized holes 1002 and 2001 are closed, and the first circulation channel is closed. During this process, the radial step 2402 extending outward provided on the valve core shaft 24 engages with the upper end face 2802 of the pressure difference piston 28, and the circulation hole 2801 is locked in a closed state, releasing the weight of the pipe string. The transposition spring 25 pushes the mandrel string upward, and the transposition sleeve 6 rotates with the movement of the transposition lug 7 in the M-shaped transposition groove. The transposition lug 7 enters the circulation position, and the circulation channel 1101 is opened, so that the annular space above the upper rubber cylinder component 13 can be circulated;

[0066] A certain weight is then applied to the working string, the mandrel string moves downward, the transposition lug 7 will enter the test position again along the track of the M-shaped transposition groove 201, the circulation hole 1001 passes through the thirteenth O-ring 49, is closed by the thirteenth O-ring 49 and the fourteenth O-ring 50, and the test hole 1003 passes through the sixteenth O-ring 54 to open the test channel 1601;

[0067] The formation isolation area is connected to the oil pipe, the weight of the pipe string is released, and the transposition spring 25 pushes the mandrel string upward again. The transposition lug 7 will enter the balance position along the M-shaped transposition groove 201. When the mandrel string moves upward, the circulation hole 1001 passes through the thirteenth O-ring 49 circulation channel 1101 and is opened. The test hole 1003 is still in the open state. 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 cylinders are assembled. The pressures at the upper and lower ends of parts 13 and 78 are balanced, and weight is applied to the working pipe string. The mandrel string moves downward, and the transposition lug 7 immediately enters the preparation position of the M-shaped transposition groove, releasing the weight of the pipe string again. The transposition spring 25 pushes the mandrel string to move upward, and the transposition lug 7 moves with the M-shaped transposition groove 201 and returns to the initial position. The pressurized holes 1002 and 2001 are opened, and the upper and lower rubber cylinders are recovered. The operation is completed at one time, and the working pipe string can be dragged to enter the upper interval for operation without lifting the working pipe string out of the wellbore.

[0068] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still embody the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A multi-cycle double-seal packer with bypass, characterized in that: include: An upper spindle (10), a lower spindle (20), and a valve spindle (24) connected in sequence; A second circulation channel (1101) is provided at one end of the upper spindle (10), a test channel (1601) is provided at the other end of the upper spindle (10), 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 cylinder mechanism is provided between the second circulation mechanism and the test mechanism; A lower balancing channel (2101) is provided at the end of the lower spindle (20), and a lower balancing mechanism is provided on the lower balancing channel (2101); a lower rubber cylinder mechanism is provided between the lower balancing mechanism and the testing mechanism; The valve core shaft (24) is provided with a first circulation channel (2901), and the first circulation channel (2901) is provided with a first circulation mechanism, and the first circulation mechanism is connected to the lower balancing mechanism.

2. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: The upper spindle (10) is connected to a transposition spindle (2), a transposition mechanism is installed on the transposition spindle (2), and the transposition mechanism is connected to the second circulation mechanism; the transposition spindle (2) and the upper spindle (10) are connected via a spline spindle (9), the outer circle of the spline spindle (9) is provided with a spline outer cylinder (8), the upper spindle (10) and the lower spindle (20) are connected via an extension shaft (18), and the lower spindle (20) and the valve spindle (24) are connected via a spindle connector (22).

3. The multi-cycle dual-seal packer with bypass according to claim 2, characterized in that: The outer cylindrical surface (202) of the transposition spindle (2) is provided with an M-shaped transposition groove (201), and 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 spindle (9) includes a plurality of splines extending radially outward, and the splines are engaged with a plurality of splines extending radially inward on the spline outer cylinder (8) to prevent the transposition spindle (2) from rotating.

4. The multi-cycle dual-seal packer with bypass according to claim 2, characterized in that: The transposition mechanism comprises: a grease injection nipple (4) and a transposition sleeve (6) sleeved on the outside of the transposition mandrel (2); the end of the grease injection nipple (4) is connected to the outer cylinder (5) of the transposition chamber, the outer circle of the grease injection nipple (4) is provided with a grease injection hole (401), and a grease injection plug (3) is installed in the grease injection hole (401); tapered roller bearings (46) are installed on the stepped outer circle of both ends of the transposition sleeve (6), and a transposition lug (7) is fixedly installed in the middle of the transposition sleeve (6), and the transposition mandrel (2) and the transposition sleeve (6) perform a reciprocating motion of the working pipe string without rotating through the transposition lug (7).

5. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: The second circulation mechanism comprises: an upper balancing cylinder (11) and a pressure transmission short section (12) arranged on the outer circle of the upper core shaft (10); the second circulation channel (1101) is arranged on the upper balancing cylinder (11) and is connected to the inner cavity of the upper core shaft (10); the upper core shaft (10) is provided with a second circulation hole (1001) connected to the upper balancing cylinder (11) and a first pressure transmission hole (1002) connected to the pressure transmission short section (12); the right end surface of the pressure transmission short section (12) is provided with a pressure transmission channel (1201) connected to the first pressure transmission hole (1002).

6. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: The glue cylinder mechanism comprises: a glue cylinder spindle (14) sleeved on an upper spindle (10), a glue cylinder assembly (13) sleeved on the glue cylinder spindle (14), and an upper sliding joint (15) installed on the other end of the glue cylinder assembly (13); the left end of the glue cylinder spindle (14) is connected to the first pressure transmission hole (1002), and the glue cylinder assembly (13), the glue cylinder spindle (14) and the upper sliding joint (15) form an annular space (1301).

7. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: The testing mechanism comprises: a testing joint (16) mounted on the upper spindle (10); a testing hole (1003) connected to the testing joint (16) is provided at the right end of the outer circle of the upper spindle (10); and the testing channel (1601) is arranged on the testing joint (16).

8. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: The lower rubber cylinder mechanism comprises: a connecting joint (19) which is sequentially mounted on the outer circle of the end of the lower core shaft (20), a lower pressure transmission short section (76), and a lower rubber cylinder core shaft (77), wherein the inner hole at the left end of the connecting joint is connected to the testing mechanism; the outer circle of the lower core shaft (20) is provided with a second pressure transmission hole (2001) which is connected to the lower pressure transmission short section (76); a lower rubber cylinder assembly (78) is mounted on the outer side of the lower rubber cylinder core shaft (77), the right end of the lower pressure transmission short section (76) is connected to the left end of the lower rubber cylinder assembly (78), the right end of the lower rubber cylinder assembly (78) is connected to a lower sliding joint (79), and the lower rubber cylinder assembly (78), the lower rubber cylinder core shaft (77) and the lower sliding joint (79) form an annular space (7801).

9. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: The lower balancing mechanism comprises: a lower balancing cylinder (21) installed at the end of the lower spindle (20), the right end of the lower balancing cylinder (21) being connected to a spring outer cylinder (23); and a balancing hole (2002) communicating with the lower balancing cylinder (21) is formed on the outer circle of the lower spindle (20).

10. The multi-cycle dual-seal packer with bypass according to claim 1, characterized in that: A transposition spring (25) is arranged outside the valve core shaft (24), and the transposition spring (25) is fixedly installed on the spring outer tube (23). The end of the transposition spring (25) is connected to a valve joint (26), a piston tube (27), a differential piston (28), a valve spring (30), and a guide shoe (32); a circulation outer tube (29) is installed outside the valve spring (30), and the radially outward extending boss (2402) of the valve core shaft (24) is connected to the pressure difference piston ( 28) is in contact with the left end face (2802) of the circulation outer cylinder (29); the circulation channel (2901) is arranged on the circulation outer cylinder (29), and the differential piston (28) is provided with a first circulation hole (2801), and the first circulation hole (2801) cooperates with the circulation channel (2901); the valve spring (30) is arranged between the lower end face (2803) of the pressure difference piston (28) and the step end face (2902) of the inner hole at the left end of the circulation outer cylinder (29).

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