CN216922076U

CN216922076U - Hydraulic setting packer in cased well

Info

Publication number: CN216922076U
Application number: CN202122515623.0U
Authority: CN
Inventors: 罗伟波; 赵亮; 万文超; 景建平
Original assignee: Baoji Changyou Petroleum Equipment Co ltd
Current assignee: Baoji Changyou Petroleum Equipment Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-07-08
Anticipated expiration: 2031-10-19

Abstract

The utility model discloses a hydraulic setting packer in a cased well, which comprises a packer body, wherein the upper end of the packer body is detachably connected with an anchoring sealing assembly, the bottom end of the packer body is connected with a hydraulic setting driving assembly, and a double-piston setting mechanism is further arranged on the packer body. This packer can realize effectual setting intensity to on the basis of setting the completion, lock the setting state through interior lock ring, with the reliability that improves packer setting. And at the in-process of setting, hydraulic pressure sets up hydraulic pressure urceolus and starts to set the piston and constitute double-piston structure in the drive of drive assembly, make it need less setting pressure alright realize double setting power, very big reduction the drive pressure that outer hydraulic equipment of well lets in the packer latus rectum, reduce the damage probability of packer internals, keep the complete validity of packer, reduce its risk of breaking down, also reduce outer hydraulic equipment of well chooseing for use the degree of difficulty simultaneously, reduce the cost of whole operation.

Description

Hydraulic setting packer in cased well

Technical Field

The utility model relates to the technical field of hydraulic setting packers for petroleum drilling, in particular to a hydraulic setting packer in a cased hole.

Background

The hydraulic packer is used for sealing an oil pipe and an underground tool of an annular space of an oil-gas well casing, and after the hydraulic packer is lowered to a designed depth, a sealing part on the packer is expanded in a hydraulic driving mode to seal an annular space of an oil sleeve. After the hydraulic compression packer is lowered to the designed depth, pressurization is carried out in an oil pipe, high-pressure liquid acts on the inner cavity of the rubber sleeve through pressure transmission holes in the packer, and the rubber sleeve expands to seal the annular space of the oil sleeve under the action of pressure difference.

The hydraulic pressure setting device is because it is darker to follow the degree of depth that the tubular column descends to in the well, its rubber sleeve subassembly that has is when setting through hydraulic drive under this degree of depth, need well ground surface department to let in great hydraulic pressure, all there is great degree of difficulty in the selection and the use of hydraulic equipment, and great hydraulic pressure when letting in the packer in exert external drive to the rubber sleeve subassembly, the external force damage to the packer body exists equally, and then influence the normal clear of packing operation, the while running cost can further increase, pack apart the operation to the pit and cause great influence.

Disclosure of Invention

Aiming at the existing problems, the utility model aims to provide a hydraulic setting packer in a cased well, in the setting process, a hydraulic setting driving assembly drives an upper hydraulic outer cylinder and a starting setting piston to form a double-piston structure, so that the driving pressure of an external hydraulic device introduced into the drift diameter of the packer is greatly reduced, the damage probability of internal components of the packer is reduced, the integrity and effectiveness of the packer are maintained, and the risk of failure of the packer is reduced.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the hydraulic setting packer in the cased well is characterized by comprising a packer body, wherein an anchoring sealing assembly is detachably connected to the upper end of the packer body, a hydraulic setting driving assembly is connected to the bottom end of the packer body, and a double-piston setting mechanism is further arranged on the packer body.

Preferably, the packer body comprises an upper mandrel and a lower mandrel which are sequentially connected from top to bottom, and a setting assembly, a locking mechanism and a driving mechanism are sequentially sleeved on the outer walls of the upper mandrel and the lower mandrel.

Preferably, the setting assembly sequentially comprises an upper slip fixed on the outer wall of the upper mandrel, an upper slip sliding sleeve, a rubber cylinder assembly, a lower slip sliding sleeve and a lower slip, wherein the upper slip sliding sleeve, the rubber cylinder assembly, the lower slip sliding sleeve and the lower slip are sequentially sleeved on the outer wall of the upper mandrel, and the upper slip sliding sleeve and the lower slip sliding sleeve are fixed on the outer wall of the upper mandrel through fixing pins;

the locking mechanism comprises a lock ring sleeve and an adjusting short section which are sequentially sleeved on the outer wall of the upper mandrel, the inner wall of the lock ring sleeve is provided with a trapezoidal inner cavity, an inner locking ring and a locking spring which are sleeved on the outer wall of the upper mandrel are sequentially arranged in the trapezoidal inner cavity, one end of the locking spring is abutted against the end part of the adjusting short section, and the inner wall of the inner locking ring is matched with the outer wall of the upper mandrel in a one-way back-off structure;

the driving mechanism comprises an upper hydraulic outer cylinder, a starting setting piston and a lower joint which are sequentially connected with the adjusting short section, the outer wall of the bottom end of the lower mandrel is in threaded connection with the inner wall of the lower joint, the inner wall of the upper hydraulic outer cylinder is provided with an upper driving cavity for embedding the top end of the lower mandrel, and the inner wall of the upper mandrel is provided with an upper injection hole communicated with the upper driving cavity;

the double-piston setting mechanism comprises a starting setting shearing pin connected between a starting setting piston and the lower joint, a lower driving cavity embedded in the bottom of the starting setting piston is formed in the inner wall of the lower joint, and a lower injection hole communicated with the lower driving cavity is formed in the inner wall of the lower mandrel.

Preferably, the rubber cylinder assembly comprises an upper end face rubber cylinder, a lower end face rubber cylinder and a middle rubber cylinder clamped between the upper end face rubber cylinder and the lower end face rubber cylinder, rubber cylinder check rings with arc-cover-shaped structures are sleeved at the outer ends of the upper end face rubber cylinder and the lower end face rubber cylinder, and the hardness of the upper end face rubber cylinder and the hardness of the lower end face rubber cylinder are larger than that of the middle rubber cylinder.

Preferably, the anchoring seal assembly comprises a tie-back mandrel and a guide joint which are sequentially connected, a tie-back fluke connected with the inner wall of the upper mandrel in a left-hand threaded manner is arranged on the outer wall of the tie-back mandrel, and the tie-back fluke can contract towards the axis direction of the tie-back fluke under the action of external force.

Preferably, the hydraulic setting drive assembly comprises an upper joint and a first lower joint which are sequentially connected with the lower core shaft, a shear pin ring is embedded at the joint of the inner walls of the upper joint and the first lower joint, a setting ball seat corresponding to the shear pin ring is sleeved in the drift diameter of the upper joint and the first lower joint, and a setting ball seat shear pin is commonly arranged between the shear pin ring and the setting ball seat in a penetrating manner.

The utility model has the beneficial effects that: this packer can realize effectual setting intensity to on the basis of setting the completion, lock the setting state through interior lock ring, with the reliability that improves packer setting. And at the in-process of setting, hydraulic pressure sets up hydraulic pressure urceolus and starts to set the piston and constitute double-piston structure in the drive of drive assembly, make it need less setting pressure alright realize double setting power, very big reduction the drive pressure that outer hydraulic equipment of well lets in the packer latus rectum, reduce the damage probability of packer internals, keep the complete validity of packer, reduce its risk of breaking down, also reduce outer hydraulic equipment of well chooseing for use the degree of difficulty simultaneously, reduce the cost of whole operation. And the anchoring seal assembly can realize the releasing operation and the secondary tie-back action after the packer is set.

Drawings

FIG. 1 is a schematic view of the overall structure of the packer body of the present invention.

FIG. 2 is an enlarged view of the region A of FIG. 1 according to the present invention.

FIG. 3 is an enlarged view of the utility model at B in FIG. 1.

FIG. 4 is an enlarged view of the assembly structure of the rubber cylinder retainer ring and the rubber cylinder on the upper end face of the rubber cylinder.

FIG. 5 is an overall view of the anchor seal assembly of the present invention.

Fig. 6 is an overall structure diagram of the hydraulic setting drive assembly of the utility model.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following further describes the technical solution of the present invention with reference to the drawings and the embodiments.

Referring to the attached drawings 1-6, the hydraulic setting packer in the cased well comprises a packer body, wherein an anchoring sealing assembly is detachably connected to the upper end of the packer body, a hydraulic setting driving assembly is connected to the bottom end of the packer body, and a double-piston setting mechanism is further arranged on the packer body. This hydraulic pressure is sat and is sealed packer transfers the suitable degree of depth in the pit through the anchoring and seals the back, sets up through hydraulic pressure and seals drive assembly drive and realize its seat and seal, and set the in-process of sealing at the drive and pass through the double piston sets a mechanism can effectual reduction drive effort to corresponding reduction is set and is sealed drive external force too big and cause the damage drawback of whole hydraulic pressure and sit a packer internals, keeps the validity of packer structure, reduces its risk of breaking down, also reduces simultaneously the chooseing for use degree of difficulty (including like specification, rated pressure size etc.) of hydraulic equipment outside the well, reduces the cost of whole operation. And the anchoring sealing assembly can realize releasing operation after the setting of the packer is finished, and lift the downhole tool connected with the upper part of the packer. When the tool is used for secondary well descending and needs to be connected back with the packer, the anchoring sealing assembly is connected with the top end of the packer along with the descending weight of the tool, and the tool is safely locked and connected with the packer again.

Specifically, as shown in fig. 2-3, the packer body comprises an upper mandrel 1 and a lower mandrel 18 which are sequentially connected from top to bottom, and a setting assembly, a locking mechanism and a driving mechanism are sequentially sleeved and connected on outer walls of the upper mandrel 1 and the lower mandrel 18. Wherein the upper mandrel 1 is connected with the anchoring sealing assembly, and the lower mandrel 18 is connected with the hydraulic setting driving assembly. The setting assembly is used for realizing stable setting of the whole packer, and the locking mechanism is used for locking the setting state of the setting assembly so as to improve the tightness of setting and overcome the influence of external force on the setting state of the packer. The driving mechanism is used for transmitting the hydraulic driving force of the hydraulic setting driving assembly to the locking mechanism, and the setting state of the setting assembly is locked.

Specifically, the setting assembly sequentially comprises an upper slip 4a fixed on the outer wall of the upper mandrel 1 (preferably, the outer peripheral surface of the upper mandrel 1 is fixed with the upper slip 4a on the outer peripheral surface of the upper mandrel 1 through an anti-rotation screw 3, so that the upper slip 4a is prevented from being separated from the upper mandrel 1 in the process of going down the well and automatically setting, the packer is kept to go down the well smoothly as a whole), and the upper slip sliding sleeve 5a, the rubber sleeve assembly, the lower slip sliding sleeve 5b and the lower slip 4b on the outer wall of the upper mandrel 1 are sequentially sleeved, and the upper slip sliding sleeve 5a and the lower slip sliding sleeve 5b are fixed on the outer wall of the upper mandrel 1 through fixing pins 6. The lower slips 4b is driven by hydraulic driving force to move upwards to push the lower slip sliding sleeve 5b, the rubber cylinder assembly and the upper slip sliding sleeve 5a to move upwards, and simultaneously the fixing pin 6 at the upper position and the lower position is cut off (the setting strength of the preferred lower slips 4b is sequentially greater than that of the rubber cylinder assembly and the upper slips 4a, so that the upper slips 4a can be preferentially set), on the basis of pushing the upper slips 4a to set, the rubber cylinder assembly continues to be pushed to set through the lower slips 4b, and finally the lower slips 4b is set.

As shown in fig. 2-3, the locking mechanism includes a locking ring sleeve 11 (specifically connected to the bottom end of the lower slip 4b) sequentially sleeved on the outer wall of the upper mandrel 1, and an adjusting nipple 15, the inner wall of the locking ring sleeve 11 is provided with a trapezoidal inner cavity 11a, an inner locking ring 12 (preferably, the inner locking ring is in contact with the inclined surface of the trapezoidal inner cavity 11a) and a locking spring 14 (preferably, a spring retainer ring 13 is further provided between the inner locking ring 11a and the trapezoidal inner cavity 11a) sequentially sleeved on the outer wall of the upper mandrel 1, one end of the locking spring 14 abuts against the end of the adjusting nipple 15, and the inner wall of the inner locking ring 12 is matched with the outer wall of the upper mandrel 1 in a one-way back-off structure. The adjusting short joint 15 and the locking ring sleeve 11 are sequentially driven by hydraulic driving force, and then the lower slips 4b are pushed, so that the sequential setting is sequentially realized. In the process that the locking ring sleeve 11 moves upwards, the adjusting short section 15 moves upwards along with the locking ring sleeve 11 through the locking spring 14, the spring retainer ring 13 and the inner locking ring 12 at the same time, and because the inner wall of the inner locking ring 12 is matched with the outer wall of the upper mandrel 1 through a one-way reverse buckling structure (particularly, a multi-flap structure is preferred, and a drawing can be radially contracted along the reverse buckling on the outer wall of the upper mandrel 1), the inner locking ring 12 always keeps moving upwards in one direction to limit the downward movement of the inner locking ring, and then after the upper and lower slips and the rubber barrel assembly are completely sealed, the sealing state is locked upwards, and the reliability of the sealing state of the packer is kept.

Specifically, as shown in fig. 3, the driving mechanism includes an upper hydraulic outer cylinder 17, a start setting piston 19, and a lower joint 21 (which are connected to the hydraulic setting driving assembly) sequentially connected to the adjustment nipple 15, the outer wall of the bottom end of the lower mandrel 18 is in threaded connection with the inner wall of the lower joint 21, an upper driving cavity 17a is formed in the inner wall of the upper hydraulic outer cylinder 17, into which the top end of the lower mandrel 18 is embedded, and an upper injection hole 101 is formed in the inner wall of the upper mandrel 1, and the upper injection hole is communicated with the upper driving cavity 17 a.

The driving principle of the structure is as follows: the bottom end of the lower joint 21 is blocked and sealed through the hydraulic setting driving assembly, hydraulic oil is introduced into the drift diameter of the lower joint from the top end of the packer, the hydraulic oil enters the upper driving cavity 17a from the upper injection hole 101, the hydraulic oil pushes the hydraulic outer cylinder 17 and the adjusting short section 15 lock ring sleeve 11 to realize the sequential setting under the limiting action of the top end of the lower mandrel 18, and the setting state is locked through the inner lock ring 12.

In order to effectively reduce the acting force of hydraulic drive setting, correspondingly reduce the damage defect of the internal components of the whole hydraulic setting packer caused by excessive setting driving external force, and maintain the effectiveness of the packer structure, as shown in fig. 3, the dual-piston setting mechanism comprises a starting setting shear pin 20 connected between a starting setting piston 19 and a lower joint 21, a lower driving cavity 21a embedded in the bottom of the starting setting piston 19 is formed in the inner wall of the lower joint 21, and a lower injection hole 102 communicated with the lower driving cavity 21a is formed in the inner wall of the lower mandrel 18.

The driving principle is as follows: under the state that the hydraulic setting drive assembly blocks the bottom end of the packer, hydraulic oil synchronously enters the lower injection hole 102 while entering the upper injection hole 101, and after the lower drive cavity 21a is filled with the hydraulic oil, the hydraulic setting drive assembly pushes the starting setting piston 19 to synchronously move upwards with the hydraulic outer cylinder 17 and sequentially pushes the adjusting short section 15 and the locking ring sleeve 11 to realize the sequential setting. This drive mode with make go up hydraulic pressure urceolus 17 and start setting piston 19 and constitute double-piston structure, very big reduction the drive pressure that outer hydraulic equipment of well let in the packer latus rectum, reduce the damage probability of packer internals, keep the complete validity of packer, reduce its risk of breaking down, also reduce outer hydraulic equipment of well simultaneously chooseing for use the degree of difficulty (including if specification, rated pressure size etc.), reduce the cost of whole operation.

Specifically, as shown in fig. 2 and 4, the rubber cylinder assembly includes an upper end surface rubber cylinder 8a, a lower end surface rubber cylinder 8b, and an intermediate rubber cylinder 9 sandwiched therebetween, rubber cylinder retaining rings 7 having arc-cap-shaped structures are respectively sleeved at outer ends of the upper end surface rubber cylinder 8a and the lower end surface rubber cylinder 8b, and hardness of the upper end surface rubber cylinder 8a and hardness of the lower end surface rubber cylinder 8b are respectively greater than that of the intermediate rubber cylinder 9 (preferably, shore hardness of the upper end surface rubber cylinder 8a and shore hardness of the lower end surface rubber cylinder 8b are respectively 90-80-90). In the process of external force driving setting, the upper end face rubber cylinder 8a and the lower end face rubber cylinder 8b simultaneously extrude the middle rubber cylinder 9 to set, the middle rubber cylinder 9 plays a main sealing role, the upper end face rubber cylinder 8a and the lower end face rubber cylinder 8b play an auxiliary sealing role, and the middle rubber cylinder 9 is protected due to higher hardness of two sides, so that more reliable sealing is realized. The rubber sleeve retainer ring 7 is preferably made of low-carbon steel, and when the rubber sleeve is compressed and set, the edge of the rubber sleeve can deform and expand to the inner diameter of the sleeve, so that the rubber sleeve at the upper, middle and lower positions is protected. The outer ends of the upper end face rubber cylinder 8a and the lower end face rubber cylinder 8b are preferably vulcanized with copper rings (not shown in the figure), and in the process of external force setting, the copper rings can also deform and expand to be closely attached to the inner diameter of the sleeve, and the rubber cylinders cannot leak from the gaps of the sleeve under the action of high pressure, so that the sealing capacity of the rubber cylinder assembly is better.

In order to realize the matching and limiting effect of the upper and lower rubber cylinders and the rubber cylinder retaining rings 7 on the two sides, the limiting shoulders 81 matched with the inner walls of the rubber cylinder retaining rings 7 in a sleeved mode are arranged on the outer sides of the upper end face rubber cylinder 8a and the lower end face rubber cylinder 8b, the rubber cylinder retaining rings 7 are matched with the limiting shoulders 81 in a sleeved mode, so that the upper end face rubber cylinder 8a, the lower end face rubber cylinder 8b and the rubber cylinder retaining rings 7 are accurately assembled and limited, and the problems that the upper, middle and lower rubber cylinders are obliquely set and the setting effect and the setting sealing tightness are reduced due to the fact that the upper, middle and lower rubber cylinders are obliquely set in the setting process driven by external force are effectively solved.

Specifically, as shown in fig. 5, the anchoring seal assembly comprises a tie-back mandrel 22 and a guide joint 23 which are connected in sequence, a tie-back fluke 24 which is connected with the inner wall of the upper mandrel 1 in a left-handed thread (preferably, the connection between the packer body components and the connection with the hydraulic setting drive assembly are both in a right-handed thread connection) is arranged on the outer wall of the tie-back mandrel 22, and the tie-back fluke 24 can be contracted towards the axial direction thereof under the action of external force (preferably, a multi-lobe structure). The tie-back fluke 24 is connected to the inner wall of the top end of an upper mandrel 1 of a packer body, the whole packer is placed into a setting position in a well to realize setting, after the setting is finished, the tie-back fluke 24 can be separated from the upper mandrel 1 through right rotation, releasing is realized, and a tool connected to the upper portion of an anchoring sealing assembly is lifted and fished. When secondary downhole butt joint is needed, the tie-back fluke 24 is linearly lowered to the inner wall of the upper mandrel 1, after the tie-back fluke 24 contacts the internal thread of the inner wall of the upper mandrel 1, the pipe column is directly pressed downwards, the tie-back fluke 24 is driven to contract and then expand, and then the effect of meshing tie-back is achieved.

Specifically, as shown in fig. 6, the hydraulic setting driving assembly includes an upper joint 25 and a first lower joint 26 sequentially connected to the lower mandrel 18, a shear pin ring 27 is embedded at a joint of inner walls of the upper joint 25 and the first lower joint 26, a setting ball seat 28 corresponding to the shear pin ring 27 is sleeved in a diameter of the upper joint 25 and the first lower joint 26, and a setting ball seat shear pin 29 is commonly inserted between the shear pin ring 27 and the setting ball seat 28. When setting is needed, a steel ball 30 is put into the drift diameter of the packer, falls to be sealed at the top end of a setting ball seat 28, then, the packer is pressurized in the drift diameter to realize sequential setting, after setting is completed and locked, a large hydraulic pressure is applied, a setting ball seat shearing pin 29 is sheared through the setting ball seat 28, the setting ball seat 28 and the steel ball 30 fall to the bottom of the well together, and the drift diameter of the packer is communicated again.

The principle of the utility model is as follows: an anchoring sealing assembly and a hydraulic setting driving assembly which are connected with a packer body up and down are lowered to a setting position in the underground along with the packer body, a steel ball 30 is thrown into the drift diameter of the packer, falls down to be sealed at the top end of a setting ball seat 28, then, the packer drift diameter is pressurized, hydraulic oil simultaneously enters a lower driving cavity 21a and an upper driving cavity 17a, a setting piston 19 is simultaneously pushed and started to move upwards synchronously with a hydraulic outer cylinder 17, setting of an upper slip 4a, a rubber cylinder component and a lower slip 4b is sequentially realized, and a setting state is locked through an inner locking ring 12. After setting is completed and locking is carried out, large hydraulic pressure is applied, the setting ball seat 28 cuts the setting ball seat shearing pin 29, the setting ball seat 28 and the steel ball 30 fall to the bottom of the well together, and the through diameter of the packer is communicated again.

When secondary well descending butt joint is needed, the tie-back fluke 24 is linearly lowered to the inner wall of the upper mandrel 1, the tie-back fluke 24 is in contact with the inner wall of the upper mandrel 1, the pipe column is directly pressed downwards, the tie-back fluke 24 is driven to contract first and then expand, and then the effect of meshing tie-back is achieved.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, and such changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The hydraulic setting packer in the cased well is characterized by comprising a packer body, wherein the upper end of the packer body is detachably connected with an anchoring sealing assembly, the bottom end of the packer body is connected with a hydraulic setting driving assembly, and a double-piston setting mechanism is further arranged on the packer body.

2. The hydraulically set packer in a cased hole of claim 1, wherein: the packer body comprises an upper mandrel (1) and a lower mandrel (18) which are sequentially connected from top to bottom, and a setting component, a locking mechanism and a driving mechanism are sequentially sleeved and connected on the outer walls of the upper mandrel and the lower mandrel.

3. The cased hole hydraulically set packer of claim 2, wherein: the setting assembly sequentially comprises an upper slip (4a) fixed on the outer wall of the upper mandrel (1), an upper slip sliding sleeve (5a), a rubber cylinder assembly, a lower slip sliding sleeve (5b) and a lower slip (4b), wherein the upper slip sliding sleeve (5a), the lower slip sliding sleeve (5b) and the lower slip sliding sleeve (4b) are sequentially sleeved on the outer wall of the upper mandrel (1), and the upper slip sliding sleeve (5a) and the lower slip sliding sleeve (5b) are fixed on the outer wall of the upper mandrel (1) through fixing pins (6);

the locking mechanism comprises a lock ring sleeve (11) and an adjusting short section (15) which are sequentially sleeved on the outer wall of the upper mandrel (1), a trapezoidal inner cavity (11a) is formed in the inner wall of the lock ring sleeve (11), an inner locking ring (12) and a locking spring (14) which are sleeved on the outer wall of the upper mandrel (1) are sequentially arranged in the trapezoidal inner cavity (11a), one end of the locking spring (14) is abutted against the end part of the adjusting short section (15), and the inner wall of the inner locking ring (12) is matched with the outer wall of the upper mandrel (1) in a one-way back-off structure;

the driving mechanism comprises an upper hydraulic outer cylinder (17), a starting setting piston (19) and a lower joint (21) which are sequentially connected with the adjusting short section (15), the outer wall of the bottom end of the lower mandrel (18) is in threaded connection with the inner wall of the lower joint (21), an upper driving cavity (17a) for embedding the top end of the lower mandrel (18) is formed in the inner wall of the upper hydraulic outer cylinder (17), and an upper injection hole (101) communicated with the upper driving cavity (17a) is formed in the inner wall of the upper mandrel (1);

the double-piston setting mechanism comprises a starting setting shear pin (20) connected between a starting setting piston (19) and a lower joint (21), wherein a lower driving cavity (21a) embedded in the bottom of the starting setting piston (19) is formed in the inner wall of the lower joint (21), and a lower injection hole (102) communicated with the lower driving cavity (21a) is formed in the inner wall of a lower mandrel (18).

4. The hydraulically set packer in a cased hole of claim 3, wherein: the rubber cylinder assembly comprises an upper end face rubber cylinder (8a), a lower end face rubber cylinder (8b) and a middle rubber cylinder (9) clamped between the upper end face rubber cylinder and the lower end face rubber cylinder, rubber cylinder check rings (7) with arc cover-shaped structures are sleeved at the outer ends of the upper end face rubber cylinder (8a) and the lower end face rubber cylinder (8b), and the hardness of the upper end face rubber cylinder (8a) and the hardness of the lower end face rubber cylinder (8b) are greater than that of the middle rubber cylinder (9).

5. The cased hole hydraulically set packer of claim 4, wherein: the anchoring sealing assembly comprises a tie-back mandrel (22) and a guide joint (23) which are sequentially connected, wherein a tie-back anchor fluke (24) which is connected with the inner wall of the upper mandrel (1) in a left-handed threaded manner is arranged on the outer wall of the tie-back mandrel (22), and the tie-back anchor fluke (24) can contract towards the axis direction of the tie-back anchor fluke under the action of external force.

6. The cased hole hydraulically set packer of claim 5, wherein: the hydraulic setting driving assembly comprises an upper joint (25) and a first lower joint (26) which are sequentially connected with the lower mandrel (18), a shear pin ring (27) is embedded at the joint of the inner walls of the upper joint and the first lower joint, a setting ball seat (28) corresponding to the shear pin ring (27) is sleeved in the drift diameter of the upper joint (25) and the first lower joint (26), and a setting ball seat shear pin (29) is arranged between the shear pin ring (27) and the setting ball seat (28) in a penetrating mode.