CN118056984A - Multifunctional graded well cementation device - Google Patents

Abstract

The invention discloses a multifunctional graded well cementation device which comprises a graded cementing component, a packing component and an anchoring component. The stage cementing assembly comprises a fluid injection channel; the packing assembly comprises a hydraulic cylinder communicated with the liquid injection channel, a moving assembly slidably arranged in the hydraulic cylinder, a packing rubber sleeve sleeved on the moving assembly and an elastic push sleeve connected with the packing rubber sleeve; the anchoring assembly comprises an anchoring main body and an anchoring slip sleeve in sliding fit with the anchoring main body, and the anchoring slip sleeve is connected with the elastic push sleeve; when liquid is injected into the liquid injection channel, the liquid enters the liquid cylinder and drives the moving assembly to axially move, so that the packing rubber cylinder and the elastic push sleeve radially expand and axially move, and the anchoring slip sleeve slides and expands relative to the anchoring main body to clamp an upper sleeve outside the well cementation device, and anchoring and annular plugging of a pipe string are realized. The invention can effectively prevent the movement of the packing unit, enhance the annular packing performance and improve the reliability of the graded well cementation operation.

Description

Multifunctional graded well cementation device

Technical Field

The invention relates to the technical field of well cementation, in particular to a multifunctional graded well cementation device.

Background

With the increase of deep well and ultra-deep well exploration and development, the underground working condition is more and more complex, and the well cementation technology faces greater challenges and difficulties. On one hand, as part of the purpose layer of the oil-gas well is buried deeply, the section of the sealing open hole is long at one time, the annular liquid column pressure of the well cementation operation is high, and the leakage is easy to occur due to exceeding the stratum bearing capacity; on the other hand, the stratum is special, weak stratum exists in the sealing section, leakage can occur in one-time well cementation, and finally well cementation quality is difficult to guarantee.

The technical problems can be solved to a certain extent by using the graded well cementation technology, but in the well cementation construction of the long open hole section by adopting the graded well cementation technology, serious leakage occurs in the stratum, so that the problem of poor well cementation quality is increasingly obvious. The packing type classification tool with the packer can realize annular packing between two-stage well cementation operations during classification well cementation, reduce the pressure of a cement slurry liquid column on a stratum, protect the stratum which is easy to leak, reduce the occurrence probability of leakage and further improve the well cementation quality. However, the existing packing type grading tool packing system is mainly of an expansion type structure, is low in bearing capacity, has the problems of early expansion and later sealing failure, is poor in safety performance, and cannot meet the requirements of deep wells and ultra-deep wells.

Disclosure of Invention

The invention mainly aims to provide a multifunctional graded well cementation device which aims to solve at least one aspect of the technical problems.

According to one aspect of the present invention, a multi-functional staged cementing device is presented comprising:

a stage cementing assembly comprising a fluid injection channel;

The packing assembly comprises a hydraulic cylinder communicated with the liquid injection channel, a moving assembly slidably arranged on the hydraulic cylinder, a packing rubber cylinder sleeved on the moving assembly and an elastic push sleeve connected with the packing rubber cylinder;

The anchoring assembly comprises an anchoring main body and an anchoring slip sleeve in sliding fit with the anchoring main body, and the anchoring slip sleeve is connected with the elastic push sleeve;

when liquid is injected into the liquid injection channel, the liquid enters the liquid cylinder and drives the moving assembly to axially move, so that the packing rubber cylinder and the elastic pushing sleeve radially expand and axially move, and the anchoring slip sleeve slides and expands relative to the anchoring main body to clamp an upper sleeve outside the well cementation device, and anchoring and expanding sealing are achieved.

According to one embodiment of the invention, the moving assembly comprises a piston arranged in the hydraulic cylinder and a seat sealing taper sleeve connected with the piston, wherein the seat sealing taper sleeve is provided with a first conical surface, and the sealing rubber cylinder is provided with a second conical surface matched with the first conical surface.

According to one embodiment of the invention, the packing element is provided with a containing groove, the elastic push sleeve comprises a main body part and an elongated extension part extending from the main body part, one end of the elongated extension part is matched with the containing groove, and the main body part is in threaded connection with the anchoring slip sleeve.

According to one embodiment of the invention, the anchoring body has a conical surface, the anchoring slip cover comprises a body part and an elongated extension part extending from the body part, the inner surface of the elongated extension part is provided with a guide angle in sliding fit with the conical surface, and the outer surface of the elongated extension part is provided with unidirectional teeth.

According to one embodiment of the invention, the anchoring body comprises an anchoring cone with the conical surface, a centralizing sleeve in threaded connection with the anchoring cone, and a limiting ring for axially limiting the anchoring cone and the centralizing sleeve.

According to one embodiment of the invention, the mobile assembly further comprises:

The pushing sleeve is arranged between the piston and the seat sealing taper sleeve, and two ends of the pushing sleeve are respectively in threaded connection with the piston and the seat sealing taper sleeve;

the surface of the first limiting ring is provided with a chamfer, and the first limiting ring is arranged between the piston and the push sleeve;

The second limiting ring is provided with inverted teeth on the surface and is arranged between the seat seal taper sleeve and the push sleeve;

The hydraulic cylinder is provided with a pawl thread matched with the pawl of the first limiting ring, and the seat seal taper sleeve is provided with a pawl thread matched with the pawl of the second limiting ring.

According to one embodiment of the invention, the packing element comprises: the rubber tube vulcanizing device comprises a rubber tube framework made of metal materials, a rubber tube vulcanizing body formed on the outer surface of the rubber tube framework and a rubber tube inner vulcanizing ring formed on the inner surface of the rubber tube framework, wherein at least one part of the outer surface of the rubber tube framework is in contact with the inner wall of the upper sleeve after expansion sealing.

According to one embodiment of the invention, the rubber cylinder framework is provided with a protruding part protruding outwards, and after the rubber cylinder framework is sealed in an expanding mode, the rubber cylinder vulcanizing body is compressed and deformed so that the protruding part is exposed to be in contact with the inner wall of the upper sleeve; and/or the inner surface of the rubber cylinder framework is provided with a groove, and the vulcanizing ring in the rubber cylinder is arranged in the groove.

According to one embodiment of the invention, the moving assembly is connected to the hydraulic cylinder by a seat seal shear pin that shears under a predetermined force.

According to one embodiment of the invention, the stage cementing assembly comprises:

A body;

The lower sliding sleeve is connected with the body and provided with a liquid inlet;

The middle joint is in threaded connection with the body and is provided with an overflow hole, a liquid inlet containing cavity is formed between the middle joint and the lower sliding sleeve, and the liquid inlet hole, the liquid inlet containing cavity and the overflow hole form at least one part of the liquid injection channel;

and the single-flow valve system is arranged on the liquid injection channel.

According to one embodiment of the invention, the stage cementing assembly further comprises an open-seat lower seat connected to the lower sliding sleeve by an open-seat shear pin and having a seal capable of sealing the fluid inlet, the open-seat shear pin shearing under a predetermined force.

According to one embodiment of the invention, the body is provided with a circulation hole, the lower sliding sleeve is provided with a sealing element capable of sealing the circulation hole, the lower sliding sleeve is connected with the body through an opening shear pin, and the opening shear pin is sheared under the action of a preset force.

According to one embodiment of the invention, the stage cementing assembly further comprises an upper slide sleeve connected to the body by a closing shear pin and a seal assembly connected to the upper slide sleeve by a locating shear pin, the seal assembly being receivable between the upper slide sleeve and the lower slide sleeve and closing the circulation aperture after the opening shear pin, the closing shear pin and the locating shear pin are all sheared.

According to the multifunctional graded well cementation device provided by the embodiment of the invention, the functions of graded cementing, packing and anchoring are integrated, so that the movement of a packing part can be effectively prevented, the sealing performance is enhanced, and the reliability of graded well cementation operation and the integrity of a pipe string are improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic view of a multi-functional staged cementing device in an initial state in accordance with an embodiment of the present invention;

FIG. 2 shows a schematic view of the multi-functional staged cementing device of FIG. 1 in a swellable seal anchored condition;

FIG. 3 shows an enlarged schematic view of a portion of the multi-functional staged cementing device of FIG. 1;

FIG. 4 shows another partial enlarged schematic view of the multi-functional staged cementing device of FIG. 1;

FIG. 5 shows another partial enlarged schematic view of the multi-functional staged cementing device of FIG. 1;

FIG. 6 shows a schematic view of the circulation hole of the multi-functional staged cementing device of FIG. 1 in an open state;

FIG. 7 shows a schematic view of the circulation hole of the multi-functional staged cementing device of FIG. 1 in a closed condition;

FIG. 8 shows a schematic view of a gravity-open plug for use with the multi-functional staged cementing device of FIG. 1;

fig. 9 shows a schematic view of a closure plug for use with the multi-functional staged cementing device of fig. 1.

In the figure:

1-upper joint; 2-a body; 3-a sealing ring; 4-closing the seat; 5-limiting snap springs; 6-closing the shear pin; 7-upper sliding sleeve; 8-positioning a shear pin; 9-a seal protective sleeve; 10-sealing rings; 11-a sealing ring; 12-opening a shear pin; 13-limiting snap springs; 14-a lower sliding sleeve; 15-opening the upper seat of the seat; 16-opening the lower seat; 17-opening the seat shear pin; 18-a seal; 19-middle joint; 20-overcurrent joint; 21-uniflow valve train; 22-piston; 23-a hydraulic cylinder; 24-a first limiting ring; 25-pushing the sleeve; 26-seat seal shear pins; 27-a second limiting ring; 28-seat sealing taper sleeve; 29-a rubber cylinder vulcanizing body; 30-a rubber cylinder framework; 31-vulcanizing ring in the rubber cylinder; 32-elastic push sleeve; 33-anchoring the slip cover; 34-anchoring the cone; 35-limiting rings; 36-righting sleeve; 37-a central tube; 38-gravity opening the plug; 39-closing occlusion; 40-moving assembly; 41-packing rubber cylinder; 42-anchoring the body; 43-a protrusion; 44-circulation holes; 100-a multifunctional graded well cementation device; 101-stage cementing assembly; 102-a packing assembly; 103-an anchor assembly; 381-shear pins; 382-inner sliding sleeve; 383-body; 384-seekers; 391-inner core; 392-colloid.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

It should be noted that, in the embodiments of the present invention, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present invention, and the following embodiments are not described one by one.

Fig. 1 shows a schematic view of a multi-functional staged cementing device 100 in an initial state, and fig. 2 shows a schematic view of the multi-functional staged cementing device 100 of fig. 1 in a swelling seal anchoring state, according to an embodiment of the present invention. Referring to fig. 1 and 2, a multi-functional staged cementing device 100 includes a staged cementing assembly 101, a packer assembly 102, and an anchor assembly 103. The stage cementing assembly 101 includes a fluid injection channel; the packing assembly 102 comprises a hydraulic cylinder 23 communicated with the liquid injection channel, a moving assembly 40 slidably arranged on the hydraulic cylinder 23, a packing rubber cylinder 41 sleeved on the moving assembly 40 and an elastic push sleeve 32 connected with the packing rubber cylinder 41; the anchor assembly 103 comprises an anchor body 42 and an anchor slip cover 33 in sliding fit with the anchor body 42, the anchor slip cover 33 being connected with the elastic push cover 32; when the liquid is injected into the liquid injection channel, the liquid enters the liquid cylinder 23 and drives the moving assembly 40 to axially move, the axial movement of the moving assembly 40 causes the packing rubber 41 and the elastic push sleeve 32 to radially expand and axially move, and the radial expansion and axial movement of the packing rubber 41 and the elastic push sleeve 32 cause the anchoring slip sleeve 33 to slide and expand relative to the anchoring main body 42 to clamp the upper casing outside the well cementation device 100, so that anchoring and expanding sealing are realized.

According to the multifunctional staged cementing device 100 of the embodiment of the present invention, the staged cementing, packing and anchoring functions are integrated, the movement of the packing sleeve 41 can be prevented by means of the anchoring assembly 103, and the sealing performance is enhanced, so that the reliability of the staged cementing operation and the integrity of the pipe string are improved. While anchoring, the packing rubber 41 expands radially under the thrust of the moving assembly 40, and the plugging operation of the annular gap is completed.

With continued reference to fig. 1, in some embodiments, the shifting assembly 40 includes a piston 22 disposed within a cylinder 23 and a seat cone sleeve 28 coupled to the piston 22, the seat cone sleeve 28 having a first tapered surface and a packing element 41 having a second tapered surface that mates with the first tapered surface. The outer surface of the seat sealing taper sleeve 28 forms the first taper surface, the inner surface of the sealing rubber cylinder 41 forms the second taper surface, the taper of the first taper surface is consistent with that of the second taper surface, and the first taper surface and the second taper surface are contacted or close to each other. The radial dimension of the first conical surface gradually decreases along the direction from top to bottom. When the piston 22 pushes the seat cone sleeve 28 downward, the radial dimension of the portion of the seat cone sleeve 28 entering the cavity of the packing element 41 gradually increases, thereby gradually squeezing the packing element 41 and providing a radially outward and axially downward force to the packing element 41, under which the packing element 41 will radially expand and axially move.

With continued reference to fig. 1, in some embodiments the packing element 41 has a receiving groove, and the elastomeric push sleeve 32 includes a body portion that is threadably coupled to the anchoring slip sleeve 33 and an elongate extension extending from the body portion that has one end that mates with the receiving groove (e.g., one end of the elongate extension extends into and is trapped within and resiliently engages the receiving groove). The elastic pushing sleeve 32 is beneficial to ensuring radial expansion and axial movement of the packing rubber 41 under the pushing of the seat sealing taper sleeve 28. The body portion may be cylindrical, and the number of the elongated extension portions may be plural (forming a multi-flap structure), and the plural elongated extension portions may extend from the body portion.

With continued reference to fig. 1, in some embodiments, the anchoring body 42 has a tapered surface and the anchoring slip cover 43 includes a body portion and an elongate extension extending from the body portion, an inner surface of the elongate extension being provided with a lead angle that slidably mates with the tapered surface, an outer surface of the elongate extension being provided with unidirectional teeth. The radial dimension of the tapered surface of the anchoring body 42 increases gradually in a top-down direction so that the anchoring slip cover 43 will expand outwardly as the anchoring slip cover 43 slides along the tapered surface from top to bottom. The main body portion of the anchoring slip cover 43 is cylindrical, and the number of the elongated extension portions of the anchoring slip cover 43 may be plural (forming a multi-flap structure), and the plural elongated extension portions may extend from the main body portion. The inner surface of the end of the elongated extension of the anchoring slip cover 43 may form a lead angle to better slip fit with the tapered surface of the anchoring body 42. The unidirectional teeth on the outer surface of the elongate extension facilitate a unidirectional anchoring function.

With continued reference to fig. 1, in some embodiments, the anchor body 42 includes an anchor cone 34 having the tapered surface, a centralizing cup 36 threadably connected to the anchor cone 34, and a stop collar 35 axially limiting the anchor cone 34 and centralizing cup 36. The axial limitation of the anchoring body 42 can ensure that the anchoring body 42 is fixed in the downward moving process of the moving assembly 40, and the packing rubber 41 and the elastic pushing sleeve 32 arranged between the moving assembly 40 and the anchoring body 42 can be radially expanded. The multi-functional staged cementing device 100 further comprises a central tube 37, an anchoring body 42 is sleeved outside the central tube 37, and a stop collar 35 is arranged between the centralizing sleeve 36, the anchoring cone 34 and the central tube 37.

Fig. 3 shows an enlarged schematic view of the portion I in fig. 1, and fig. 4 shows an enlarged schematic view of the portion J in fig. 1. Referring to fig. 1,3, and 4, in some embodiments, the mobile assembly 40 further includes: the pushing sleeve 25 is arranged between the piston 22 and the seat sealing taper sleeve 28, and two ends of the pushing sleeve 25 are respectively in threaded connection with the piston 22 and the seat sealing taper sleeve 28; a first stop collar 24 with teeth on the surface, which is arranged between the piston 22 and the push sleeve 25; the surface of the second limiting ring 27 is provided with inverted teeth, and the second limiting ring is arranged between the seat sealing taper sleeve 28 and the push sleeve 25; wherein the hydraulic cylinder 23 has a back-tooth thread for mating with the back-tooth of the first stop collar 24, and the seat cone sleeve 28 has a back-tooth thread for mating with the back-tooth of the second stop collar 27. Through the cooperation of the pawl on the first spacing ring 24 and the second spacing ring 27 and corresponding pawl screw thread, can play fine axial spacing effect, prevent to seal the system seat and seal inefficacy, can further guarantee after pressure is unloaded, seal packing element 41 and anchor slips cover 33 can not retract, improves the reliability of packing and anchoring. The first stopper ring 24 may be a single-sided inverted tooth stopper ring, with inverted teeth formed only on a side surface (outer surface) of the first stopper ring 24 facing the piston 22. The second stop collar 27 may be a double-sided inverted tooth stop collar, with inverted teeth formed on both the inner and outer surfaces thereof, with the inverted teeth on the outer surface being threadedly engaged with the inverted teeth on the seat cone sleeve 28, and the inverted teeth on the inner surface being threadedly engaged with the inverted teeth on the center tube 37.

Fig. 5 shows an enlarged schematic view of the K portion in fig. 1. Referring to fig. 1 and 5, in some embodiments, packing element 41 comprises: the rubber tube framework 30 made of metal materials, the rubber tube vulcanizing body 29 formed on the outer surface of the rubber tube framework 30 and the rubber tube inner vulcanizing ring 31 formed on the inner surface of the rubber tube framework 30 are adopted, wherein at least one part of the outer surface of the rubber tube framework 30 is contacted with the inner wall of the upper sleeve after expansion sealing, so that metal-metal sealing can be formed between the rubber tube framework 30 and the upper sleeve, sealing performance and sealing long-acting performance can be improved, and V0-level sealing can be realized. The inner and outer sides of the rubber cylinder skeleton 30 can be formed with the rubber cylinder inner vulcanizing ring 31 and the rubber cylinder vulcanizing body 29 by a vulcanizing rubber process, so that good bonding strength between metal and rubber is ensured. The rubber cylinder skeleton 30 may be made of a high-strength and high-extensibility metal material.

Referring to fig. 5, the cartridge frame 30 has a protruding portion 43 protruding outward, and after the swelling, the cartridge vulcanizer 29 is compressively deformed such that the protruding portion 43 is exposed to contact with the inner wall of the upper sleeve. The rubber skeleton 30 is designed as a profiled structure comprising a plurality of meandering structures defining a plurality of concave portions in which the rubber vulcanizing body 29 and the rubber inner vulcanizing ring 31 are formed. The inner surface of the packing element skeleton 30 is provided with a groove, and the inner vulcanizing ring 31 of the packing element is arranged in the groove, so that a part of the inner surface of the packing element skeleton 30 forms a part of the inner surface of the packing element 41, and the part of the inner surface of the packing element skeleton 30 can be contacted with the seat sealing taper sleeve 28 to form a metal-metal seal.

Referring to fig. 1, in some embodiments, the moving assembly 40 is coupled to the hydraulic cylinder 23 by a shear pin 26, the shear pin 26 shearing under a predetermined force. Referring to fig. 2, after the seal shear pin 26 is sheared, the moving assembly 40 may be moved downwardly by the fluid drive. The seat seal shear pin 26 can avoid the problem that the moving component 40 moves easily under the action of interference force and causes the radial expansion of the packing rubber 41, and can avoid the problem of sealing in advance.

Referring to fig. 1, in some embodiments, a stage cementing assembly 101 comprises: a body 2; a lower sliding sleeve 14 connected with the body 2 and provided with a liquid inlet; the middle joint 19 is in threaded connection with the body 2 and is provided with an overflow hole, a liquid inlet containing cavity is formed between the middle joint 19 and the end face of the lower sliding sleeve, and the liquid inlet hole, the liquid inlet containing cavity and the overflow hole form at least one part of the liquid injection channel; a check valve system 21 is provided in the liquid injection passage. From which liquid can enter, reach the liquid inlet volume, flow through the flow holes and finally into the liquid cylinder 23. The provision of the single flow valve system 21 ensures that liquid can flow only in one direction. The stage cementing assembly 101 may also include an flow joint 20 also having an flow orifice, the flow joint 20 being threadably coupled to the middle joint 19, and the fluid flowing through the flow orifice of the middle joint 19 and the flow orifice of the flow joint 20 in sequence into the hydraulic cylinder 23. The outer side of the lower end of the middle joint 19 is in threaded connection with the overflow joint 20, and the inner side is in threaded connection with the central tube 37. The hydraulic cylinder 23 is screwed to the flow-through joint 20.

Referring to fig. 1, in some embodiments, the stage cementing assembly 101 further comprises an open sub-seat 16, the open sub-seat 16 being coupled to the lower sliding sleeve 14 by an open seat shear pin 17 and having a seal capable of sealing off the fluid intake orifice, the open seat shear pin 17 shearing under a predetermined force. In the initial state, the liquid inlet of the lower sliding sleeve 14 is blocked by the sealing element of the lower seat 16, liquid cannot enter the liquid injection channel, and the moving assembly 40 is not driven. Referring to fig. 2, when an expansion anchor is required, the lower seat 16 is lowered by shearing the lower seat shear pin 17, and the liquid inlet on the lower slide sleeve 14 is exposed, so that liquid can enter from the liquid inlet and reach the hydraulic cylinder 23 to drive the moving assembly 40. In some embodiments, the shearing of the open seat shear pin 17 may be accomplished in conjunction with gravity opening the plug 38. And the gravity opening plug 38 is thrown into the pipe column, after the gravity opening plug 38 reaches the position of an opening seat (comprising an opening seat upper seat 15 and an opening seat lower seat 16), a plug is formed, 6 MPa+/-2 MPa is pressed, the opening seat shear pin 17 is sheared, and at the moment, liquid can enter a liquid inlet hole on the lower sliding sleeve 14 through an inner hole of the gravity opening plug 38. Fig. 8 shows a schematic view of the gravity-open plug 38, as shown in fig. 8, the gravity-open plug 38 comprising a shear pin 381, an inner slide 382, a body 383, a guide head 384. The risk of premature sealing and anchoring is avoided by gravity opening the plug 38 to control opening and closing.

Referring to fig. 1, in some embodiments, the body 2 is provided with circulation holes 44 (shown in fig. 6), a plurality of circulation holes 44 may be circumferentially distributed at the middle of the body 2, the lower sliding sleeve 14 has a sealing member capable of blocking the circulation holes 44, and the lower sliding sleeve 14 is connected to the body 2 through the opening shear pin 12, and the opening shear pin 12 is sheared under a predetermined force. Fig. 6 shows a schematic view of the circulation hole 44 in an opened state, and as shown in fig. 6, after the shear pin 12 is opened to shear, the lower sliding sleeve 14 descends so that the circulation hole 44 is exposed, at this time, a cementing operation can be performed, and the collar slurry, tail slurry and post-fluid are injected through the circulation hole 44.

Referring to fig. 1, in some embodiments, the stage cementing assembly 101 further comprises an upper sliding sleeve 7 and a sealing assembly, the upper sliding sleeve 7 being connected to the body 2 by a closing shear pin 6 and the sealing assembly being connected to the upper sliding sleeve 7 by a locating shear pin 8. Fig. 7 shows a schematic view of the circulation hole 44 in a closed state, and as shown in fig. 7, the sealing assembly can be accommodated between the upper and lower sliding sleeves 7 and 14 and close the circulation hole 44 after the opening shear pin 12, the closing shear pin 6, and the positioning shear pin 8 are all sheared. The closing plug 39 can be matched with the closing plug 39 to realize the shearing of the closing shear pin 6, the closing plug 39 is released from a wellhead and replaced by a replacement liquid, and when the closing plug 39 reaches the closing seat 4, the closing shear pin 6 is sheared along with the increase of the pressure in the tubular column, and the upper sliding sleeve 7 descends. Fig. 9 shows a schematic view of the closure plug 39, as shown in fig. 9, the closure plug 39 comprising an inner core 391, a gel 392. Referring again to fig. 1, in an initial state, a gap is formed between the upper sliding sleeve 7 and the lower sliding sleeve 14, and a sealing assembly protrudes from the surface of the upper sliding sleeve 7 and is located in the gap, and the sealing assembly comprises a sealing element protecting sleeve 9 and two groups of sealing elements arranged in the sealing element protecting sleeve 9, and the sealing elements are arranged in the protecting sleeve, so that the protection of the sealing elements is facilitated. The upper sliding sleeve 7 is provided with a boss on which the sealing element protecting sleeve 9 is arranged. In the descending process of the upper sliding sleeve 7, the sealing component is contacted with the end face of the lower sliding sleeve 14, the positioning shear pin 8 shears under the action of the downward pressure, and the sealing component moves into the inner side of the lower sliding sleeve 14 to realize the closing of the circulation hole 44, so that the closing reliability can be ensured, and the integrity of a pipe string is improved.

In some embodiments, the stage cementing assembly 101 further comprises an upper sub 1, the upper end of the body 2 being female threaded and being in threaded engagement with the male threads of the upper sub 1. An opening seat upper seat 15 is designed at the upper end of the opening seat lower seat 16, and the opening seat upper seat 15 is in threaded connection with the lower sliding sleeve 14. The outer wall of the upper sliding sleeve 7 is provided with a plurality of groups of sealing elements (such as a sealing ring 3 and a sealing ring 10) which are sealed with the body 2, and two groups of clamping spring I grooves are designed, and the stage cementing assembly 101 further comprises a limiting clamping spring 5 matched with the clamping spring I grooves. The upper end of the upper sliding sleeve 7 is provided with a closing seat 4, and the closing seat 4 is connected with the upper sliding sleeve 7 through threads. The lower end of the lower sliding sleeve 14 is provided with an anti-rotation boss which corresponds to an anti-rotation groove on the inner side of the middle joint 19, so that the sealing failure caused by the rotation of the closing sleeve in the drilling operation process is prevented. The lower sliding sleeve 14 is provided with a sealing ring 11 to achieve a seal with the body 2, and a sealing member 18. The lower sliding sleeve 14 is further provided with a clamp spring II groove, and the stage cementing assembly 101 further comprises a limit clamp spring 13 matched with the clamp spring II groove. Under the action of the limit clamp spring 5 and the limit clamp spring 13, the upper sliding sleeve 7 and the lower sliding sleeve 14 cannot move upwards, so that the closing reliability of the circulation hole 44 is ensured. The piston 22 is internally and externally provided with two sets of seals to effect a seal with the cylinder 23.

The following describes a process of performing a cementing operation using the multi-functional hierarchical cementing device 100 of an embodiment of the present invention, the process comprising the steps of:

step one, pipe strings are put in: after the multi-functional staged cementing device 100 is lowered to the designed position along with the string of pipes, primary cementing operation is performed according to the normal flow.

Step two, opening a plug in place by gravity, and opening a liquid inlet of the packing system: after the first-stage bump-in-press is completed, gravity is thrown into the pipe string to open the plug 38. After the gravity opening plug 38 reaches the opening seat, a plug is formed, the pressure is 6 MPa+/-2 MPa, the opening seat shear pin 17 is sheared, the opening seat lower seat 16 is downward, the liquid inlet hole on the lower sliding sleeve 14 is exposed, the liquid flows through the liquid inlet hole of the lower sliding sleeve 14 through the gravity opening plug 38, then flows through the middle joint 19 and the overflow joint 20, and the overflow hole compression check valve 21 reaches the upper end of the piston 22.

Thirdly, anchoring by a packing system seat packing and an anchoring system: continuing to press 8MPa plus or minus 2MPa, the seat seal shear pin 26 shears, the piston 22 drives the push sleeve 25 and the seat seal taper sleeve 28 to move downwards together, and the packing rubber 41 and the elastic push sleeve 32 are forced to expand radially and move axially. The anchoring slip sleeve 33 is pushed to descend, and under the limit of the anchoring cone 34, the anchoring slip sleeve 33 tile gradually expands until the anchoring slip sleeve is clamped on the inner wall of the upper sleeve, so that an anchoring effect is achieved. At the same time, the packing rubber 41 expands radially under the thrust of the seat packing cone 28. And stabilizing the pressure for 10min, ensuring that the packing system is fully expanded and firmly anchored, and completing the plugging operation of the annular gap.

Step four, starting a circulating hole of a cementing system, and performing secondary well cementation: continuing to press the pipe column to 10MPa plus or minus 2MPa, starting the shear pin 12 to shear, descending the lower sliding sleeve 14, and exposing the circulation hole 44. The secondary cementing construction operation can be performed.

Step five, closing a cementing system circulation hole: the closing plug 39 is released from the wellhead and replaced by the displacement fluid, and after the closing plug 39 reaches the closing seat 4, the closing shear pin 6 is sheared off and the upper sliding sleeve 7 descends as the pressure in the pipe column increases. The sealing element protecting sleeve 9 is contacted with the end face of the lower sliding sleeve 7, the positioning shear pin 8 is sheared under the action of downward pressure, the sealing element protecting sleeve 9 moves, a boss with a sealing element enters the inner side of the lower sliding sleeve 14, the closing of a circulation hole is realized, and the secondary well cementation operation is completed.

And step six, after construction is finished, a small drilling tool is put in, the internal drillable parts are drilled out, the inner diameter of the device is ensured to be the same as the inner diameter of the sleeve, and the well is completed.

According to the description, the multifunctional graded well cementation device 100 provided by the embodiment of the invention integrates the functions of graded cementing, packing and anchoring, adopts the V0-grade mechanical packing unit and the high-strength unidirectional slip structure, effectively prevents the packing unit from moving, enhances the sealing performance, improves the reliability of graded well cementation operation and the integrity of a pipe string, and can solve the problems of large number of well depths, open hole section length, oil, gas and water display layers, large pressure system difference, low stratum bearing capacity, easy leakage and difficult well cementation quality guarantee.

Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the invention, are included within the scope of the embodiments of the invention.

Claims (13)

1. A multi-functional staged cementing device comprising:

a stage cementing assembly comprising a fluid injection channel;

The packing assembly comprises a hydraulic cylinder communicated with the liquid injection channel, a moving assembly slidably arranged on the hydraulic cylinder, a packing rubber cylinder sleeved on the moving assembly and an elastic push sleeve connected with the packing rubber cylinder;

The anchoring assembly comprises an anchoring main body and an anchoring slip sleeve in sliding fit with the anchoring main body, and the anchoring slip sleeve is connected with the elastic push sleeve;

when liquid is injected into the liquid injection channel, the liquid enters the liquid cylinder and drives the moving assembly to axially move, so that the packing rubber cylinder and the elastic pushing sleeve radially expand and axially move, and the anchoring slip sleeve slides and expands relative to the anchoring main body to clamp an upper sleeve outside the well cementation device, and anchoring and expanding sealing are achieved.

2. The apparatus of claim 1, wherein the moving assembly comprises a piston disposed within the hydraulic cylinder and a seat seal cone sleeve coupled to the piston, the seat seal cone sleeve having a first tapered surface and the packing element having a second tapered surface that mates with the first tapered surface.

3. The apparatus of claim 1 wherein the packing element has a receiving slot, the resilient push sleeve comprising a main body portion and an elongate extension extending from the main body portion, one end of the elongate extension engaging the receiving slot, the main body portion threadably engaging the anchoring slip sleeve.

4. The device of claim 1, wherein the anchoring body has a tapered surface, the anchoring slip cover comprises a body portion and an elongate extension extending from the body portion, an inner surface of the elongate extension is provided with a guide angle that slidably mates with the tapered surface, and an outer surface of the elongate extension is provided with unidirectional teeth.

5. The device of claim 4, wherein the anchor body comprises an anchor cone having the tapered surface, a centralizing cup threadably connected to the anchor cone, and a stop collar axially limiting the anchor cone and centralizing cup.

6. The apparatus of claim 2, wherein the moving assembly further comprises:

The pushing sleeve is arranged between the piston and the seat sealing taper sleeve, and two ends of the pushing sleeve are respectively in threaded connection with the piston and the seat sealing taper sleeve;

the surface of the first limiting ring is provided with a chamfer, and the first limiting ring is arranged between the piston and the push sleeve;

The second limiting ring is provided with inverted teeth on the surface and is arranged between the seat seal taper sleeve and the push sleeve;

The hydraulic cylinder is provided with a pawl thread matched with the pawl of the first limiting ring, and the seat seal taper sleeve is provided with a pawl thread matched with the pawl of the second limiting ring.

7. The apparatus of claim 1, wherein the packing element comprises: the rubber tube vulcanizing device comprises a rubber tube framework made of metal materials, a rubber tube vulcanizing body formed on the outer surface of the rubber tube framework and a rubber tube inner vulcanizing ring formed on the inner surface of the rubber tube framework, wherein at least one part of the outer surface of the rubber tube framework is in contact with the inner wall of the upper sleeve after expansion sealing.

8. The device of claim 7, wherein the cartridge frame has an outwardly projecting tab, and wherein after sealing, the cartridge carcass is compressively deformed such that the tab is exposed for contact with the inner wall of the upper casing; and/or

The inner surface of the rubber cylinder framework is provided with a groove, and the vulcanizing ring in the rubber cylinder is arranged in the groove.

9. The apparatus of claim 1, wherein the moving assembly is coupled to the hydraulic cylinder by a seat seal shear pin that shears under a predetermined force.

10. The apparatus of claim 1, wherein the stage cementing assembly comprises:

A body;

The lower sliding sleeve is connected with the body and provided with a liquid inlet;

The middle joint is in threaded connection with the body and is provided with an overflow hole, a liquid inlet containing cavity is formed between the middle joint and the lower sliding sleeve, and the liquid inlet hole, the liquid inlet containing cavity and the overflow hole form at least one part of the liquid injection channel;

and the single-flow valve system is arranged on the liquid injection channel.

11. The apparatus of claim 10, wherein the stage cementing assembly further comprises an open-seat lower seat coupled to the lower sliding sleeve by an open-seat shear pin having a seal capable of sealing the fluid inlet port, the open-seat shear pin shearing under a predetermined force.

12. The device of claim 10, wherein the body is provided with a circulation hole, the lower sliding sleeve is provided with a sealing element capable of sealing the circulation hole, the lower sliding sleeve is connected with the body through an opening shear pin, and the opening shear pin is sheared under the action of a preset force.

13. The apparatus of claim 12, wherein the stage cementing assembly further comprises an upper slide sleeve coupled to the body via a closing shear pin and a seal assembly coupled to the upper slide sleeve via a locating shear pin, the seal assembly being receivable between the upper slide sleeve and the lower slide sleeve and closing the circulation aperture after the opening shear pin, the closing shear pin, and the locating shear pin are all sheared.