CN220645898U - Hydraulically set cement squeezed drillable packer - Google Patents

Abstract

The utility model relates to a hydraulic setting cement squeezing drillable packer, which comprises a tubular column, a mandrel, an upper joint, an upper slip, an upper cone, an upper back ring, a rubber cylinder, a lower back ring, a lower cone, a lower slip, a piston mechanism, a guide valve body, a sealing slide valve, a setting ball and a plug. The utility model can be connected with an oil pipe, a drill rod or a continuous oil pipe, can be put into a horizontal well, a highly inclined well or a vertical well, can transmit torque in the process of putting into the well, has strong resistance to meeting the blockage, is opened when being put into the well, and can automatically communicate cement squeezing pore canals without filling liquid at the lower part, is provided with a piston mechanism, is hydraulically sealed, and does not need to lift or rotate a tubular column to realize sealing of a packer; the packer is anchored bidirectionally, and the bearing capacity is strong. The utility model can realize the large-displacement cement extrusion construction operation, complete the operations of setting, releasing, flushing the inner cavity of the packer, cement extrusion construction and closing the cement extrusion channel by one drilling operation, thereby saving the occupied time and labor cost of the drilling machine greatly.

Description

Hydraulically set cement squeezed drillable packer

Technical field

The utility model relates to a downhole tool for petroleum development, in particular to a hydraulically seated cement-squeezing drillable packer.

Background technique

During the process of oil testing, well completion, and well workover in oil field development, it is usually necessary to permanently or temporarily block the water-producing layer and waste layer. The current domestic solutions to the above tasks are:

1. Using a packer or smooth oil pipe to squeeze cement, the process is simple, but the pressure difference of the cement squeeze packer is small and the reliability is not high. After the packer squeezes cement, the packer is lifted out too early, and the cement squeeze effect is not good; If the packer is lifted out too late, the packer will be easily solidified by the cement slurry, which is very risky. It is also difficult to control the timing of lifting the pipe string by squeezing cement into the smooth oil pipe. In horizontal wells or highly deviated wells, the cement slurry will easily lie flat on the casing. On the horizontal half section of the pipe, it is not easy to squeeze into the target layer.

2. The mechanical setting tool sets the cement retainer and squeezes the cement. It completes the setting and squeezing of the cement retainer by lifting and rotating the oil pipe or drill pipe string in one trip. It is convenient and reliable, but it has limitations. In highly deviated wells and horizontal wells, because the friction between the pipe string and the inner wall of the casing is too large, the torque cannot be effectively transmitted from the surface to the mechanical setting tool thousands of meters below, and the mechanical setting tool cannot be realized. Secondly, the mechanical setting tool must be lifted to a large tonnage to complete the setting of the cement retainer. For deep wells, the weight of the pipe string itself is very large, plus the setting force value of the cement retainer. It is very large, requiring very high ground lifting equipment, as well as high tensile load requirements for the pipe string itself.

3. Conventional hydraulic setting tools and cement squeezing tools can be used in diameter, inclined and horizontal wells. They have high reliability, but they require the first trip of the pipe string to complete the setting of the cement retainer and then pull out the drilling tool. The second pass of sealing and intubation is then run in for cement squeezing operation, which wastes operation time, takes up drilling rig man-hours, and is costly. Moreover, it is often caused by the process of taking out the first set setting pipe string and running the second set cement squeeze pipe string. Downhole mud, sand or other falling objects will settle and block the switch squeeze cement sliding sleeve inside the sealed central tube of the cement retainer that has been set, causing the second sealing intubation to be unable to effectively open and close the cement retainer. Squeeze the cement sliding sleeve, but cannot squeeze cement into the lower part of the cement retainer.

4. The one-pass hydraulic cement retainer that has appeared in recent years, although the setting and release of the pipe string is completed hydraulically, there are problems caused by the upward buckling and shrinkage of the pipe string and the upward buckling and shrinkage of the tubing during the cement squeezing process. The sliding sleeve at the end of the retainer is closed and the cement squeezing operation cannot be completed; the slide valve is not resistant to erosion, causing the slide valve to fail to close and causing the cement slurry to regurgitate, which cannot solve the problem of large-displacement cement squeezing, or the bottom one-way ball valve The erosion damage caused by large-displacement cement squeezing construction cannot prevent the cement slurry from regurgitating at the bottom.

Utility model content

In order to solve the above problems, this utility model provides a hydraulically-setting type cement-squeezing drillable packer, which can realize large-displacement cement-squeezing construction operations and complete the setting, throwing and flushing of the packer in one drilling trip. Internal cavity, cement squeeze construction and cement squeeze channel closing operations.

The technical solution adopted by the utility model is: a hydraulically set cement-squeezing drillable packer, which is characterized by: including a pipe string, a mandrel, an upper joint, an upper slip, an upper cone, an upper backing ring, and glue. barrel, lower back ring, lower cone, lower slip, piston mechanism, guide valve body, sealing slide valve, setting ball and plug. The mandrel is sleeved outside the pipe string, and the upper joint and upper clamp The tile, upper cone, upper back ring, rubber barrel, lower back ring, lower cone, lower slip, piston mechanism and guide valve body are sleeved on the mandrel in sequence from top to bottom; the upper end of the upper joint is connected to the pipe The column is fixedly connected, a first shear pin is provided between the upper joint and the sleeve, the lower end of the upper joint is fixedly connected to the mandrel; the upper cone and the lower cone are fixedly connected to the mandrel; the upper The backing ring is connected to the mandrel through a first rolling pin, and the lower backing ring is connected to the mandrel through a second rolling pin;

The piston mechanism includes a thrust piston and a piston cylinder liner. One end of the thrust piston is arranged in the piston cylinder liner cavity, and the other end is against the lower slip; a second shear is provided between the thrust piston and the piston cylinder liner. Pin, a lock ring is provided between the thrust piston and the mandrel, the piston cylinder liner cavity passes through the mandrel and is connected to the center hole of the pipe string, and the piston cylinder liner is fixedly connected to the mandrel;

The upper end of the guide valve body is fixedly connected to the core shaft, and a plug is provided in the lower end shaft hole; the sealing slide valve is sleeved in the guide valve body, and the sealing slide valve is provided with a sealing slide valve through hole. The valve body is provided with a guide valve body through hole that matches the sealing slide valve through hole, and the internal passage of the guide valve body passes through the sealing slide valve through hole and the guide valve body through hole to communicate with the outside; the elasticity of the sealing slide valve The end of the claw is stuck in the groove at the lower end of the pipe string, and there is a gap for the elastic claw to be released between the pipe column and the guide valve body; a ball seat is provided at the lower end of the center hole of the pipe string, and the ball seat There is a third shear pin between the pipe string and the setting ball, and the setting ball is arranged in the ball seat.

Preferably, the pipe string includes an upper joint of the feed well, a sealing connecting rod and a switch joint arranged in sequence from top to bottom. The upper joint of the feed well is fixedly connected to the upper joint, with a first shear pin between them; the seal The upper end of the connecting rod is fixedly connected to the upper joint of the feed well, and the lower end is fixedly connected to the switch joint; the switch joint is provided with a switch joint through hole, and the mandrel is provided with a mandrel through hole corresponding to the switch joint through hole, so The piston cylinder liner cavity is connected to the center hole of the pipe string through the mandrel through hole and the switch joint through hole; the ball seat is arranged at the lower end of the center hole of the switch joint.

Preferably, a vulcanized sealing ring and a third sealing ring are provided at the connection between the uphole joint and the sealed connecting rod, and a seventh sealing ring and a ninth sealing ring are provided between the switch joint and the mandrel. There is an eleventh sealing ring between the joint and the ball seat.

Preferably, the upper end of the inner hole of the upper joint is provided with connecting threads, and the outer circumferential surface is evenly distributed with countersunk milling grooves along the axial direction. The countersunk milling grooves cooperate with the convex ribs in the inner hole of the upper joint.

Preferably, the outer circumferential surfaces of the upper slips and lower slips are each provided with wicker-shaped serrations at an angle of 30° to the horizontal direction.

Preferably, a fourth sealing ring and a fifth sealing ring are provided between the thrust piston and the piston cylinder liner, and a sixth sealing ring is provided between the piston cylinder liner and the core shaft.

Preferably, a first sealing ring is provided between the upper joint and the core shaft.

Preferably, a retaining ring and a second sealing ring are provided between the rubber cartridge and the core shaft.

Preferably, an eighth sealing ring is provided between the guide valve body and the core shaft, a twelfth sealing ring is provided between the guide valve body and the sealing slide valve, and a twelfth sealing ring is provided between the guide valve body and the plug. There is a thirteenth sealing ring.

A method of using a hydraulically set cement-squeezing drillable packer, which is characterized by: including the following steps:

Setting process: After the packer is lowered to the designated position, the ball is pressed for pressure. After the liquid passes through the switch joint through hole and the mandrel through hole, it flows into the cavity of the piston cylinder liner. The liquid pushes up and pushes the piston to move upward. Shear the second shear pin, and the thrust piston squeezes upward with the lock ring. When the thrust reaches the radial shear ultimate strength of the first roll pin and the second roll pin, it breaks; continue to move, and when the upper slip is reached At the rupture limit force value, the upper slip ruptures and is anchored to the inner wall of the casing. At the same time, the upper back ring and the lower back ring shrink radially after receiving the radial component force from the upper cone, the lower cone and the end slope of the rubber barrel. , at the same time, the rubber barrel is axially squeezed to produce radial deformation, and it is close to the inner wall of the casing to achieve sealing and block the upper and lower fluids; the lower slips open and anchor at the same time to prevent the rubber barrel from retracting, and the lock ring simultaneously moves toward The upper part of the mandrel slides and engages with the serrated thread on the outer surface of the mandrel to further lock the setting load; continue to increase the hydraulic pressure until the ball seat receives a downward shear force sufficient to shear the third shear pin. , at this time the tee is shot down, the setting ball and the tee come down to contact the upper end surface of the plug, and the whole setting process is completed at this time;

The throwing process: the pipe string is lifted up. Since the upper slip is anchored to the casing after being cracked, axial shearing occurs between the upper joint of the delivery well and the upper joint. The first shear pin is sheared, and the entire pipe string is separated from the seal. The isolator is detached. At this time, the elastic claw of the sealing slide valve moves upward after receiving a lifting force at the groove on the lower side of the switch joint, closing the liquid outlet channel on the side of the guide valve body;

The process of back-inserting and squeezing cement: Insert the pipe string back into the inner cavity of the mandrel. The outer vulcanized rubber of the vulcanized sealing ring and the inner surface of the mandrel achieve interference extrusion sealing to prevent the lower fluid from escaping to the outside of the upper part of the pipe string; at the same time, it is squeezed The outer circumferential surface of the compression deformed rubber barrel and the inner wall of the casing generate extrusion stress to achieve liquid isolation on the upper and lower sides of the rubber barrel, and the retaining ring and the second sealing ring are in the middle inner hole space of the rubber barrel after extrusion and deformation. Played a filling role;

During the cement extrusion process, if the sealing slide valve cannot open normally and there is high pressure on the ground, it is judged that debris has filled the space where the sealing slide valve moves downward. At this time, the pipe string needs to be lifted out of the isolation Set the top of the packer to a certain height, start flushing the debris or sediment at the bottom of the packer, and then insert the pipe string again to smoothly open the sealing slide valve, connect the sealing slide valve and the cement squeezing channel of the guide valve body, and perform the cement squeezing operation again;

The process of pulling out the pipe string: after squeezing the cement, lift the pipe string directly to complete the separation between the pipe string and the packer. At the same time, close the tail sealing slide valve to ensure that the cement slurry that has not yet solidified is in the packer. Liquid isolation at the end of the device.

The utility model can be connected to any type of running string such as oil pipes, drill pipes or coiled tubing, and can be run into horizontal wells, highly deviated wells or vertical wells. It does not limit well conditions and running methods, and can transmit torque during the running process. , strong resistance to resistance, the slide valve opens when running in, and the cement squeeze holes are automatically connected, without the need to pour liquid while lowering. It has a built-in piston mechanism and hydraulic setting. There is no need to lift or rotate the pipe string to achieve the setting of the packer. ; The packer is bidirectionally anchored and has strong pressure-bearing capacity. The elastic claws on the sealing slide valve and the cement squeeze holes are relatively independent. The cement slurry will not pass through the sides of the elastic claws, and the elastic claws will not be interrupted by the liquid. It leads to the risk of cement slurry regurgitating that cannot be closed, and meets the needs of large-displacement cement squeezing process; during the cement squeezing process, the shrinkage of the pipe string caused by pump pressure is avoided, and closing the slide valve makes it impossible to continue the high-pressure cement squeezing operation. The parts are easy to drill. material, the tail adopts an anti-drilling structure, and the drill-out type has no idling phenomenon. This utility model can realize large-displacement cement squeezing construction operations. It can complete the operations of packer setting, throwing away, flushing the packer inner cavity, cement squeezing construction and closing the cement squeezing channel in one drilling operation, which saves a lot of drilling rigs. Takes up time and labor costs.

Description of drawings

Figure 1 is a schematic structural diagram of the hydraulically set cement-squeezing drillable packer of the present invention;

Figure 2 is a schematic diagram of the well entry state;

Figure 3 is a schematic diagram of the pitching suppression and setting state;

Figure 4 is a schematic diagram of the tee shot down state;

Figure 5 is a schematic diagram of the state when the pipe string is lifted up and the pipe string is separated from the packer;

Figure 6 is a schematic diagram of the status of pipe string insertion and cement squeeze operation;

Figure 7 is a schematic diagram of the completed state of lifting the pipe string and squeezing cement;

Figure 8 is a schematic structural diagram of the joint on the delivery well;

Figure 9 is a schematic structural diagram of the upper joint;

Figure 10 is a schematic structural diagram of the sealing slide valve;

FIG11 is a schematic structural diagram of a guide valve body;

Figure 12 is a schematic structural diagram of the plug;

Figure 13 is a schematic structural diagram of the switch connector;

In the picture: 1. Feed well upper joint; 11. Bottom milling groove; 2. Upper joint; 21. Raised rib; 3. First shear pin; 4. First sealing ring; 5. First set screw; 6 , upper slip; 7. mandrel; 71. mandrel through hole; 8. upper cone; 9. first roll of leather pin; 10. upper outer backing ring; 11. upper inner backing ring; 12. rubber barrel; 13. Retaining ring; 14. Second sealing ring; 15. Lower inner backing ring; 16. Lower outer backing ring; 17. Second roll pin; 18. Lower cone; 19. Vulcanized sealing ring; 20. No. Three sealing rings; 21. Lower slip; 22. Sealing connecting rod; 23. Locking ring; 24. Second shear pin; 25. Thrust piston; 26. Piston cylinder liner; 27. Fourth sealing ring; 28. No. Five sealing rings; 29. Sixth sealing ring; 30. Switch connector; 301. Switch connector via hole; 302. Groove; 31. Second set screw; 32. Seventh sealing ring; 33. Eighth sealing ring; 34. Ninth sealing ring; 35. Guide valve body; 351. Guide valve body through hole; 352. Positioning hole; 36. Positioning pin; 37. Tenth sealing ring; 38. Setting ball; 39. Eleventh seal Ring; 40. Third shear pin; 41. Ball seat; 42. Twelfth sealing ring; 43. Sealing slide valve; 431. Sealing slide valve through hole; 432. Elastic claw; 44. Thirteenth sealing ring ; 45. Third set screw; 46. Plug; 00. Casing; 47. Clearance.

Detailed ways

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

As shown in Figure 1-13, a hydraulically-set cement-squeezing drillable packer of the present invention is characterized by: including a pipe string, a mandrel 7, an upper joint 2, an upper slip 6, and an upper cone. 8. Upper back ring (composed of upper outer back ring 10 and upper inner back ring 11), rubber barrel 12, lower back ring (composed of lower inner back ring 15 and lower outer back ring 16), lower cone 18, lower Slip 21, piston mechanism, guide valve body 35, sealing slide valve 43, setting ball 38 and plug 46, mandrel 7 is set outside the pipe string, upper joint 2, upper slip 6, upper cone 8, The upper back ring, rubber barrel 12, lower back ring, lower cone 18, lower slip 21, piston mechanism and guide valve body 35 are sleeved on the mandrel 7 from top to bottom; the upper end of the upper joint 2 is fixed to the pipe string connection, there is a first shear pin 3 between the upper joint 2 and the sleeve, the lower end of the upper joint 2 is fixedly connected to the mandrel 7; the upper cone 8 and the lower cone 18 are fixedly connected to the mandrel 7; the upper back ring passes The first roll pin 9 is connected to the mandrel 7 , and the lower back ring is connected to the mandrel 7 through the second roll pin 17 .

The piston mechanism includes a thrust piston 25 and a piston cylinder liner 26. One end of the thrust piston 25 is arranged in the cavity of the piston cylinder 26, and the other end is against the lower slip 21; a second shear is provided between the thrust piston 25 and the piston cylinder liner 26. Cut the pin 24, and a lock ring 23 is provided between the thrust piston 25 and the mandrel 7. The cavity of the piston cylinder liner 26 passes through the mandrel 7 and is connected to the center hole of the pipe string. The piston cylinder liner 26 is fixed to the mandrel 7. connect.

The upper end of the guide valve body 35 is fixedly connected to the core shaft 7, and a plug 46 is provided in the lower end shaft hole; the sealing slide valve sleeve 43 is provided in the guide valve body 35, and the sealing slide valve 43 is provided with a sealing slide valve through hole 431, and the guide valve body 35 is provided with a sealing slide valve through hole 431. The valve body 35 is provided with a guide valve body through hole 351 that matches the sealing slide valve through hole 431. The internal passage of the guide valve body 35 passes through the sealing slide valve through hole 431 and the guide valve body through hole 351 to communicate with the outside; the sealing slide valve The end of the elastic claw 432 of 43 is stuck in the groove 302 at the lower end of the pipe string. There is a gap 47 between the pipe column and the guide valve body 35 for the elastic claw 432 to release; a ball seat 41 is provided at the lower end of the center hole of the pipe string. , a third shear pin 40 is provided between the ball seat 41 and the pipe string, and the setting ball 38 is arranged in the ball seat 41.

In this embodiment, the pipe string includes an upper feed well joint 1, a sealing connecting rod 22 and a switch joint 30 arranged in sequence from top to bottom. The upper feed well joint 1 and the upper joint 2 are fixedly connected, and a first shear pin 3 is provided between them. ; The upper end of the sealed connecting rod 22 is fixedly connected to the feed well upper joint 1, and the lower end is fixedly connected to the switch joint 30; the switch joint 30 is provided with a switch joint through hole 301, and the mandrel 7 is provided with a core corresponding to the switch joint through hole 301 The shaft through hole 71 and the piston cylinder liner 26 cavity are connected to the center hole of the pipe string through the mandrel through hole 71 and the switch joint through hole 301; the ball seat 41 is set at the lower end of the center hole of the switch joint 30, with a third shear in between. Cut dowel 40.

In this embodiment, a vulcanized sealing ring 19 and a third sealing ring 20 are provided on the upper side of the connecting thread at the tail of the sealed connecting rod 22. The tail is threadedly connected to a switch joint 30, and the tail of the switch joint 30 is connected to a tenth shear pin 40 through a third shear pin 40. A sealing ring 39 and a ball seat 41, the upper inner hole of the ball seat 41 is provided with a setting ball 38. The setting ball 38 and the ball seat 41 form a seal under hydraulic pressure setting, temporarily blocking the lower liquid flow channel, allowing liquid to enter the piston mechanism, and achieving anchoring and sealing of the packer.

In this embodiment, the outer circumferential surfaces of the upper slips 6 and the lower slips 21 are provided with wicker-shaped saw teeth at an angle of 30° to the horizontal direction. Their surfaces have undergone a surface high-frequency quenching process and have high hardness, which is beneficial to strong force after being stressed. The inner wall of the casing forms an anchor; the upper slip 6 and the lower slip 21 respectively bear the upward and downward anchoring thrust.

In this embodiment, the rubber barrel 12 is radially deformed after being compressed. The rubber on the deformed outer circle forms an extrusion stress with the inner wall of the casing 00, thereby sealing the annulus of the oil casing. At the same time, the inner and outer backing rings are deformed radially and close to the casing. The inner wall of the tube prevents pressure from damaging the colloid on the upper and lower outer sides of the deformed rubber tube 12.

In this embodiment, a second shear pin 24 is provided between the thrust piston 25 and the piston cylinder liner 26. A fourth sealing ring 27 and a fifth sealing ring 28 are respectively installed inside and outside the lower tail of the thrust piston 25. The piston cylinder liner The inner wall of the lower side of 26 has threads for connection with the external thread of the tail of the mandrel 7 . The sixth sealing ring 29 is installed in the inner circular sealing groove of the lower side of the piston cylinder liner 26 .

As shown in Figure 11, in this embodiment, the guide valve body 35 is connected with the external thread at the lower tail of the mandrel 7, the second set screw 31 is fixed on the upper thread of the guide valve body 35, and a positioning hole 352 and a positioning hole 352 are provided in the middle. The tenth sealing ring 37 is provided with a positioning pin 36 in the positioning hole 352, which is used for installation and positioning between the guide valve body 35 and the sealing slide valve 43; a twelfth sealing ring 42 is installed in the guide valve body 35, and the outer circumference of the lower side is There are ribs and guide valve body through holes 351 evenly distributed in four places. The tail portion has an internal thread and an external thread connection of the plug (46). There is a thirteenth sealing ring 44 and a third set screw 45 at the end of the thread.

In this embodiment, the inner hole on the upper side of the uphole joint 1 has a conventional oil pipe female thread, as shown in Figure 8, and the outer circumferential surface has six evenly distributed sunken bottom milling grooves 11. The bottom milling grooves 11 are the same as those in Figure 2 The upper side of the upper joint 2 cooperates with the slope surface rib 21 with a 30° chamfer in the horizontal direction, which can transmit torque during the pipe string entering the well, making it easier for the pipe string to move forward in highly deviated wells or horizontal wells; there is Six evenly distributed sunk bottom holes are used to install the shear head part of the first shear pin 3, which is used to overcome the shrinkage force of the pipe string generated when the packer is hydraulically set, and at the same time provide the pipe string and the packer. Temporary connection and detachment function after setting.

In this embodiment, the rubber cartridge 12 is extruded into an elliptical shape along the core axis 7 after passing through the upper cone 8 and the lower cone 18, and forms a contact extrusion stress with the inner wall of the casing 00, thereby realizing the annulus of the oil casing. For isolation, the upper backing ring and the lower backing ring are respectively pressed against the 45° inclined planes on the sides of the upper cone 8 and the lower cone 18 to slide upward and relax radially to deform, close to the inner wall of the casing, thereby protecting the pressurized The outer round shoulders on the upper and lower sides of the rubber barrel 12 prevent the rubber from being extruded and damaged, thereby achieving high-pressure differential sealing.

As shown in FIG. 13 , in this embodiment, there are two evenly distributed waist-shaped through-hole milling grooves in the middle of the switch connector 30 (ie, the switch connector via hole 301 ). The switch connector via hole 301 and the lower end of the mandrel 7 The circular liquid inlet hole (i.e., the mandrel through hole 71) forms the liquid inlet channel when the packer is set; the upper end inner hole of the thrust piston 25 has a sawtooth thread, and the sawtooth thread meshes with the lock ring 23. When pressure enters the piston After the inner cavity of the cylinder liner 26, the thrust piston 25 moves upward, driving the lock ring 23 to slide upward, and gradually meshes with the sawtooth thread on the outer surface of the mandrel 7 to achieve the locking and anti-retreat function, which can be better To achieve sealing and anchoring; at the same time, the second shear pin 24 temporarily fixes the thrust piston 25 and the piston cylinder liner 26 within a certain shear force value range to prevent the pressure difference caused by the pressure excitement during the pipe string lowering process from causing the piston to The packer is set in advance due to the early startup of the mechanism.

In this embodiment, the outer circumference of the guide valve body 35 is provided with a seal formed by a tenth sealing ring 37 and a positioning pin 36. The protruding part at the rear of the positioning pin 36 is opposite to the three milled grooves evenly distributed on the outer circumference of the upper end of the sealing slide valve 43. position, so that the liquid outlet passage on the outer circumferential surface of the sealing slide valve 43 (i.e., the sealing slide valve through hole 431) is circumferentially aligned with the liquid outlet passage on the lower side of the guide valve body 35 (i.e., the guide valve body through hole 351). The smoothness of the liquid discharge when squeezing cement is ensured to the greatest extent, and the liquid discharge channel is relatively independent of the elastic claw 432 on the upper side of the sealing slide valve 43. The fluid will not pass through the elastic claw 432 of the sealing slide valve 43 and then be elastically stuck. The claw 432 will not be washed away by the fluid, which will not cause damage to the elastic claw 432. It will not happen that the sealing valve body cannot be pulled out through the feeding pipe string and cannot be reset after the cement squeeze is completed. The cement slurry is regurgitated due to the inability of the sealing slide valve 43 to effectively close.

The assembly sequence of the drillable packer of the present invention is: connect the lower thread of the upper joint 2 with the upper thread of the mandrel 7, install the first sealing ring 4, tighten the first set screw 5; Install the upper slip 6 on the side, install the upper cone 8, drill a certain depth through the rolling pin hole of the upper cone 8 on the mandrel 7, and smash in the first rolling pin 9; install the first outer back ring 10 and the first inner backing ring 11; use a rubber hammer to install the retaining ring 13 and the second sealing ring 14 into the rubber barrel 12, and then install them into the middle of the mandrel 7 as a whole, and fit them together with the inner and outer backing rings; Then install the second inner backing ring 15 and the second outer backing ring 16, install the lower cone 18 in the same way, and drill in the rolled pin holes of the mandrel 7 and the lower cone 18, and knock in the second Roll up the leather pin 17 twice, install the lower slip 21, screw the lock ring 23 into the serrated thread in the upper inner hole of the thrust piston 25, and install the fourth sealing ring 27 and the fifth sealing ring 28 into the thrust piston 25 respectively. into the sealing ring grooves on the inner and outer circular surfaces of the lower end, and then insert it onto the mandrel 7. Knock the sixth sealing ring 29 into the mandrel 7 from the lower side and connect the internal threads; install the twelfth sealing ring 42. into the upper sealing groove of the sealing slide valve 43, install the tenth sealing ring 37 on the positioning pin 36, and screw it into the positioning hole 352 of the guide valve body 35, and move the sealing valve body 43 from the positioning hole 352 of the guide valve body 35. Knock in the upper side until the lower step of its elastic claw 352 contacts the inner hole step of the guide valve body 35. Note that the milled groove opening phase of the sealing slide valve (43) is aligned with the sunken tail end of the plug (36) , so that the sealing slide valve through hole 431 is aligned with the guide valve body through hole 351, install the eighth sealing ring 33 in the sealing ring groove of the upper end inner hole of the guide valve body 35, and connect the tail thread of the mandrel 7, and install it Tighten the second set screw 31; install the thirteenth sealing ring 44 into the upper sealing ring groove of the plug 46, and connect it to the thread of the inner hole at the lower tail of the guide valve body 35, and tighten the third set screw. 45. At this point, the installation of the drillable packer assembly is completed; then connect the external thread on the lower side of the upper joint 1 of the delivery well and the internal thread on the upper side of the sealing connecting rod 22, and install the vulcanized sealing ring 19 and the third sealing ring 20 on the sealing connection. The smooth outer surface of the lower side of the rod 22 is connected to the internal thread connecting the upper end of the switch joint 30. Install the eleventh sealing ring 39 into the inner hole on the lower side of the switch joint 30 and install the third shear pin 40. Find the setting ball 38 and set it aside. At this point, the connection of the feeding tool assembly (i.e. pipe string) is completed; finally, insert the feeding pipe string into the inner hole of the mandrel 7 and find the phase so that the slope milling of the joint 1 on the feeding well is completed. The groove 11 fits the convex rib 21 in the upper inner hole of the upper joint 2, and finally the first shear pin 3 is installed. At this point, the entire tool string is installed and is in a state ready to be entered into the well.

The working principle of this program is:

Setting process: After lowering the packer to the designated position, the ground ball is pressed. After the liquid passes through the switch joint through hole 301 and the mandrel through hole 71, it flows into the chamber of the piston cylinder liner 26, and the thrust piston 25 moves upward. trend, the second shear pin 24 is sheared, and the lock ring 23 is squeezed upward. When the thrust reaches the radial shear ultimate strength of the first roll pin 9 and the second roll pin 17, it breaks, and then continues to move. , when the rupture limit force value of the upper slip 6 is reached, the upper slip 6 breaks and is anchored on the inner wall of the casing. At the same time, the upper back ring and the lower back ring are respectively affected by the upper cone 8 and the lower cone 18 and the rubber barrel. The radial component at the 45° slope of the end face of 12 shrinks and expands radially, protecting the shoulder of the axially compressed rubber tube 12 from being overturned, and better achieving pressure bearing; at the same time, the rubber tube 12 is axially squeezed Radial deformation occurs, and the outer circular surface bears an elliptical shape and is tightly attached to the inner wall of the casing 00 to achieve sealing and block the upper and lower fluids; the lower slip 21 opens and anchors at the same time to prevent the rebound force of the rubber barrel 12. The lock ring 23 simultaneously slides toward the upper part of the mandrel 7 and engages with the serrated thread on the outer surface of the mandrel 7 to increase the locking setting load; continue to increase the hydraulic pressure until the ball seat 41 is sheared downward. The force value is enough to cut off the third shear pin 40. At this time, the ball seat 41 is shot down. The setting ball 38 and the ball seat 41 descend to contact the upper end surface of the plug 40. At this time, the entire setting process is completed.

The throwing process: lifting the pipe string, because the upper slip 6 is anchored on the casing 00 after cracking, restricting the upward axial movement, at this time, axial shearing occurs between the upper joint 1 and the upper joint 2 of the delivery well. The first shear pin 3 is cut off, and the entire pipe string is separated from the packer; at this time, the elastic claw 432 of the sealing slide valve 43 moves upward after receiving a lifting force at the concave surface 302 on the lower side of the switch joint 30, and is closed. The liquid outlet channel on the side of the guide valve body 35.

The process of back-inserting and squeezing cement: Insert the pipe string back into the inner cavity of the mandrel 7. The outer vulcanized rubber of the vulcanized sealing ring 19 and the inner surface of the mandrel achieve an interference squeeze seal to prevent the lower fluid from escaping to the upper part of the feeding tool. On the outside, the outer circumferential surface of the rubber barrel 12 that is extruded and deformed at the same time and the inner wall of the casing produce a large contact extrusion stress, achieving liquid isolation on the upper and lower sides of the rubber barrel 12, and retaining the ring 13 and the second sealing ring 14 It plays a filling role in the inner hole space in the middle of the rubber barrel 12 after extrusion and deformation, making the sealing more reliable and the pressure bearing higher;

If the sealing slide valve 43 cannot be opened normally during the reinsertion process and there is high pressure on the ground, it is judged that debris has filled the space where the sealing slide valve 43 moves downward. At this time, the pipe string needs to be lifted upward to drill. About 1 meter from the top of the packer, start flushing the debris or sediment at the bottom of the packer with a large displacement to wash away the debris, and then insert it again to open the sealing slide valve 43 smoothly and connect it with the guide valve body 35 of the cement squeezing channel and perform the cement squeezing operation again.

During the process of squeezing cement, the cement slurry will only pass through the 45° oblique hole of the sealing slide valve 43, and will not flow through the gap milled by the elastic claw 432 on the upper side, thereby not damaging the three holes of the sealing slide valve 43. The elastic claw 432 ensures that when lifting the pipe string, the locking joint 30 can smoothly drive the sealing slide valve 43 upward, close the cement squeeze channel, and hold the unsolidified cement slurry on the lower side of the packer to achieve This ensures the convenience of safely pulling out the pipe string.

At the same time, during the cement squeezing process, the fluid will only flow into the cement squeezing channel of the guide valve body 35 at the bottom and the chamber of the piston cylinder liner 26. The thrust generated by the thrust piston 25 will only push the slip anchoring system of the packer. The compression of the sealing extrusion system is tighter and the anchoring is more stable, instead of pushing the pipe string upward like other pipe string cement retainers, causing the pipe string to move upward and thus closing the tail sealing slide valve. 43 and the cement extrusion channel of the guide valve body 35.

The process of pulling out the pipe string: after squeezing the cement, lift the pipe string directly to complete the separation between the pipe string and the packer. At the same time, close the tail sealing slide valve 43 to ensure that the cement slurry that has not yet solidified is still there. Liquid isolation at the tail of the packer.

Here, it should be noted that the description of the above technical solutions is exemplary, this description can be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims.

Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above-mentioned embodiments, and may also have many modifications. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model should be considered to belong to the protection scope of the present utility model.

Claims (9)

1. A hydraulic setting cement extrusion drillable packer is characterized in that: the sealing device comprises a tubular column, a mandrel, an upper joint, an upper slip, an upper cone, an upper back ring, a rubber cylinder, a lower back ring, a lower cone, a lower slip, a piston mechanism, a guide valve body, a sealing slide valve, a sealing ball and a plug, wherein the mandrel is sleeved outside the tubular column, and the upper joint, the upper slip, the upper cone, the upper back ring, the rubber cylinder, the lower back ring, the lower cone, the lower slip, the piston mechanism and the guide valve body are sequentially sleeved on the mandrel from top to bottom; the upper end of the upper joint is fixedly connected with the tubular column, a first shearing pin is arranged between the upper joint and the sleeve, and the lower end of the upper joint is fixedly connected with the mandrel; the upper cone and the lower cone are fixedly connected with the mandrel; the upper back ring is connected with the mandrel through a first skin rolling pin, and the lower back ring is connected with the mandrel through a second skin rolling pin;

the piston mechanism comprises a thrust piston and a piston cylinder sleeve, one end of the thrust piston is arranged in a cavity of the piston cylinder sleeve, and the other end of the thrust piston is abutted against the lower slip; a second shearing pin is arranged between the thrust piston and the piston cylinder sleeve, a lock ring is arranged between the thrust piston and the mandrel, a cavity of the piston cylinder sleeve passes through the mandrel and the tubular column to be communicated with a central hole of the tubular column, and the piston cylinder sleeve is fixedly connected with the mandrel;

the upper end of the guide valve body is fixedly connected with the mandrel, and a plug is arranged in a shaft hole at the lower end of the guide valve body; the sealing slide valve is arranged in the guide valve body, the sealing slide valve is provided with a sealing slide valve through hole, the guide valve body is provided with a guide valve body through hole matched with the sealing slide valve through hole, and the inner channel of the guide valve body is communicated with the outside through the sealing slide valve through hole and the guide valve body through hole; the tail end of the elastic claw of the sealing slide valve is clamped in a groove at the lower end of the pipe column, and a gap for releasing the elastic claw is arranged between the pipe column and the guide valve body; the lower extreme is equipped with the ball seat in the tubular column centre bore, be equipped with the third between ball seat and the tubular column and cut the pin, the setting ball sets up in the ball seat.

2. The hydraulic setting cement extrusion drillable packer as defined in claim 1, wherein: the tubular column comprises a well-conveying upper joint, a sealing connecting rod and a switch joint which are sequentially arranged from top to bottom, wherein the well-conveying upper joint is fixedly connected with the upper joint, and a first shearing pin is arranged between the well-conveying upper joint and the upper joint; the upper end of the sealing connecting rod is fixedly connected with the upper joint of the well feeding, and the lower end of the sealing connecting rod is fixedly connected with the switch joint; the piston cylinder sleeve cavity is communicated with the tubular column center hole through the mandrel via hole and the switch joint via hole; the ball seat is arranged at the lower end of the central hole of the switch joint.

3. The hydraulic setting cement extrusion drillable packer as defined in claim 2, wherein: the joint of the well-conveying upper joint and the sealing connecting rod is provided with a vulcanized sealing ring and a third sealing ring, a seventh sealing ring and a ninth sealing ring are arranged between the switch joint and the mandrel, and an eleventh sealing ring is arranged between the switch joint and the ball seat.

4. The hydraulic setting cement extrusion drillable packer as defined in claim 2, wherein: the upper end of the inner hole of the upper joint of the well is provided with connecting threads, the outer circular surface is uniformly provided with countersink milling grooves along the axial direction, and the countersink milling grooves are matched with convex ribs in the inner hole of the upper joint.

5. The hydraulic setting cement extrusion drillable packer as defined in claim 1, wherein: the outer circle surfaces of the upper slips and the lower slips are respectively provided with wicker-shaped saw teeth which are 30 degrees away from the horizontal direction.

6. The hydraulic setting cement extrusion drillable packer as defined in claim 1, wherein: a fourth sealing ring and a fifth sealing ring are arranged between the thrust piston and the piston cylinder sleeve, and a sixth sealing ring is arranged between the piston cylinder sleeve and the mandrel.

7. The hydraulic setting cement extrusion drillable packer as defined in claim 1, wherein: a first sealing ring is arranged between the upper joint and the mandrel.

8. The hydraulic setting cement extrusion drillable packer as defined in claim 1, wherein: a retaining ring and a second sealing ring are arranged between the rubber cylinder and the mandrel.

9. The hydraulic setting cement extrusion drillable packer as defined in claim 1, wherein: an eighth sealing ring is arranged between the guide valve body and the mandrel, a twelfth sealing ring is arranged between the guide valve body and the sealing slide valve, and a thirteenth sealing ring is arranged between the guide valve body and the plug.