A double-base bridge inverted packer cementing device without drilling blind plates

Abstract

The invention discloses a double-base bridge inverted packer drilling-free blind plate cementing device, comprising a collision and compression rubber plug and a packer connected to a casing, a blind plate component and a centralizer, the centralizer comprising at least one group of centralizer blocks, the centralizer block group comprising a centralizer block for embedding into the casing and slidably connected to the casing, at least two centralizer blocks are distributed along the circumference of the casing, and the centralizer further comprises a driving assembly for driving the centralizer block to displace so that the centralizer block at least partially protrudes from the outer wall of the casing. In the cementing device provided by the invention, when the casing is lowered into the well, the centralizer block is embedded and connected to the casing, and no obstruction is generated when the casing is lowered into the well. After the casing is lowered into the well, the centralizer block slides out and can resist the well wall outside the casing, and at least the casing section near the packer and the centering degree of the packer can be adjusted, so as to ensure that the annulus can be densely blocked in the circumferential direction after the packer expands, and a good annulus seal is achieved, thereby ensuring the stability and quality of the annulus cement pouring, and improving the cementing quality.

Description

Technical Field

[0001] The invention relates to the technical field of cementing devices, and more particularly to a double-base bridge inverted packer cementing device without drilling a blind plate. Background Art

[0002] Cementing is an indispensable and important part in the process of drilling and completion. It includes plugging the casing and the annulus (annular space, referred to as annulus) between the casing and the wellbore, and injecting cement slurry into the annulus. The cementing device used in the cementing process generally includes a blind plate to plug the casing lumen, a packer to plug the annulus, and a collision plug after injecting cement slurry. The packer is set or connected to the casing, and generally consists of an inner layer pipe and an outer layer expansion rubber tube. After water injection, the expansion rubber tube will expand and then plug the annulus between the outer wall of the casing and the wellbore. However, the casing in the horizontal well section is affected by gravity, and the casing is not necessarily located in the center of the wellbore. It may be skewed or deviated from the center and close to the wellbore wall on one side and away from the wellbore wall on the other side. In this case, the distance between the expansion rubber tube and the wellbore wall in the circumferential direction will be different. After the expansion rubber tube expands, it is easy for some positions to not be pressed against or pressed against the wellbore wall and not be tightly sealed, thereby affecting the quality of cement injection into the annulus and the quality of cementing.

[0003] Casing centering is a key factor affecting cementing quality. Therefore, how to solve the problem in the prior art that the packer cannot tightly seal the annulus after expansion due to poor casing centering, thus affecting cementing quality, has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide a double-base bridge inverted packer cementing device without drilling blind plates. When the casing is lowered into the well, the straightening block of the straightener is embedded in and connected to the casing, and no obstruction is caused when the casing is lowered into the well. After lowering into the well, the straightening block slides out and can resist the well wall outside the casing. At least the casing section near the packer and the centering of the packer can be adjusted to ensure that the annulus can be tightly sealed in the circumferential direction after the packer expands, and a good annulus seal is achieved, thereby ensuring the stability and quality of the annulus cement pouring, and solving the problem in the prior art that the annulus is not tightly sealed due to poor casing centering, thereby affecting the cementing quality.

[0005] To achieve the above-mentioned purpose, the present invention provides a double-base bridge inverted packer drilling-free blind plate cementing device, including a pressure plug and a packer connected to the casing, a blind plate component and a stabilizer, the stabilizer including at least one group of straightening block groups, the straightening block group including a straightening block for being embedded in the casing and slidably connected to the casing, at least two straightening blocks are distributed along the circumference of the casing, and the straightening device also includes a driving component for driving the straightening block to move so that the straightening block protrudes from the outer wall of the casing.

[0006] Preferably, the driving assembly includes a base for pushing the displacement of the straightening block and a driving structure for pushing the displacement of the base, the driving structure includes a force-bearing surface communicated with the sleeve cavity and connected to the base, the base is slidably connected to the sleeve and slides and displaces along the axial direction of the sleeve, the base is provided with a pushing inclined surface for resisting the straightening block, and the pushing inclined surface is gradually inclined along the axial direction of the sleeve; each of the straightening blocks slides and displaces along the radial direction of the sleeve and extends axially, and the straightening blocks are provided with a resisting inclined surface for resisting the pushing inclined surface, the resisting inclined surface is inclined along the axial direction of the sleeve, and the inclination direction matches the pushing inclined surface.

[0007] Preferably, the base is annular, and the blind plate component includes a main blind plate, which blocks the inner annular space of the base and is provided with a connecting structure between the main blind plate and the inner annular wall of the base that connects the two and can be separated or disconnected, an anti-backward movement structure is provided between the base and the casing to prevent the base from moving in the opposite direction, and a first connecting locking structure for connecting the impact rubber plug and the main blind plate is provided between the impact rubber plug and the main blind plate.

[0008] Preferably, a salvage tube is further included, and a second connecting and locking structure connecting the salvage tube and the impact rubber plug is provided between the salvage tube and the impact rubber plug.

[0009] Preferably, the anti-backward movement structure includes a groove arranged on the outer wall of the base and an elastic locking claw embedded in the groove, and the thickness of the elastic locking claw in a natural state is greater than the depth of the groove.

[0010] Preferably, the straightening block groups are provided with two distributed along the axial direction of the casing, the base is provided with two corresponding to the two straightening block groups one by one, and are respectively set as an upper base and a lower base; the lower base is connected to the main blind plate through the connecting structure, the driving assembly also includes a connecting component, a first end of the connecting component is detachably connected to the upper base, and a second end is fixedly connected to the main blind plate, the first connecting locking structure is provided on the connecting component, and the driving structure includes a bridge channel provided on the connecting component, one end of the bridge channel is against the main blind plate, and the other end passes through the secondary blind plate and the upper base and is connected to the casing lumen on the other side of the upper base.

[0011] Preferably, a mud channel communicating with the casing lumen and the mud through hole on the casing wall is provided on the first end of the connecting component or the upper base.

[0012] Preferably, the connecting component includes a central tube connecting the main blind plate and the upper base, the open tube cavities at both ends of the central tube form the bridge channel, and the upper base is sleeved on the first end of the central tube; the connecting component also includes a lifting bucket sleeved and fixedly connected to the first end of the central tube, the lifting bucket is detachably connected to the inner ring wall of the upper base, and the first connection locking structure is arranged in the lifting bucket; the mud channel includes through holes respectively arranged on the upper base and the straightening block connected to the upper base, and all of them are radially through holes.

[0013] Preferably, the blind plate component also includes a secondary blind plate which is annular and sleeved on the central tube, the secondary blind plate is provided with a water injection channel which at least partially connects the bridge channel with the packer, the wall of the central tube is provided with a water injection hole connected to the water injection channel, and the water injection channel is provided with a valve for conducting or cutting off.

[0014] Preferably, the first connection locking structure and the second connection locking structure both include external teeth arranged on the pressure rubber plug, clamping claws respectively connected to the lifting bucket and the overshot bucket and used to clamp the pressure rubber plug, and connecting teeth arranged on the inner wall of the clamping claws and used to mesh with the external teeth.

[0015] In the technical solution provided by the present invention, a double-base bridge inverted packer drill-free blind plate cementing device includes a straightening block for embedding in the casing, and at least two straightening blocks are distributed along the circumference of the casing, and each straightening block can be displaced and protruded from the casing under the drive of a driving component; before lowering into the well, the straightening block can be embedded in the casing, and no large raised section will be formed on the outer wall of the casing, which will not affect the casing lowering operation, and will not be stuck by the well wall or collide with the well wall to cause damage or affect the lowering into the well; after the casing is lowered into the well, each straightening block is displaced under the action of the driving component and at least part of it will protrude from the outer wall of the casing, that is, the outer side of each straightening block can resist the well wall in the radial direction, and the inner side is connected to the casing, so that the reverse force of the well wall can press against the casing.

[0016] Therefore, the technical solution provided by the present application can include the following beneficial effects: at least two straightening blocks distributed along the circumference of the casing, after being displaced by the action of the driving assembly and protruding from the outer wall of the casing, will both be against the well wall, and under the reverse force of the well wall, will have a radial pressing effect on the casing, thereby making the casing section near the straightening block straighten; the straightening block is arranged near the packer, then at least the casing section near the packer and the packer are straightened relative to the central axis of the wellbore, and the centering degree of the casing section near the packer and the packer can be effectively adjusted, ensuring that the annulus can be tightly sealed in the circumferential direction after the packer expands, achieving good annulus sealing, thereby ensuring the stability and quality of the annulus cement pouring, and solving the problem in the prior art that the annulus is not tightly sealed due to poor casing centering, thus affecting the cementing quality.

[0017] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided in this application are described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a first state of a double-base bridge inverted packer non-drilling blind plate cementing device in an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the upper base and the righting block in the righting state in an embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the lower base and the righting block in the righting state in an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the connection between the overshot, the impact rubber plug and the lifting overshot in the embodiment of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the salvage state in an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the casing and the base after salvage in an embodiment of the present invention.

[0025] Figure 1-Figure 6 middle:

[0026] 1. Straightening block; 101. Counteracting inclined plane; 102. Connecting pin; 2. Upper base; 3. Lower base; 4. Main blind plate; 5. Auxiliary blind plate; 501. Water injection channel; 6. Center pipe; 7. Bridge channel; 8. Lifting bucket; 9. Rubber plug tube; 10. Pushing inclined plane; 11. Elastic locking claw; 12. Mud channel; 121. First through hole; 122. Second through hole; 13. Packer; 14. Impact plug; 15. Overshot tube; 16. Holding claw; 161. Locking plate; 162. Connecting tooth. DETAILED DESCRIPTION

[0027] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0028] The purpose of this specific embodiment is to provide a double-base bridge inverted packer cementing device that does not require drilling of blind plates. When the casing is lowered into the well, the straightening block of the straightener is embedded in and connected to the casing, and no obstruction is caused when the casing is lowered into the well. After lowering into the well, the straightening block slides out and can resist the well wall outside the casing. At least the casing section near the packer and the centering of the packer can be adjusted to ensure that the annulus can be tightly sealed in the circumferential direction after the packer expands, and a good annulus seal is achieved, thereby ensuring the stability and quality of the annulus cement pouring, and solving the problem in the prior art that the annulus is not tightly sealed due to poor casing centering, thereby affecting the cementing quality.

[0029] The following embodiments are described in detail with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the content of the invention described in the claims. In addition, the entire content of the structure represented by the following embodiments is not limited to the solution required as the invention described in the claims.

[0030] Please refer to the attached Figure 1-6The double-base bridge inverted packer 13 provided in this embodiment is used to connect with the downhole casing and act on the casing. The cementing device includes a collision and pressure plug 14 and a packer 13 connected to the casing, a blind plate component and a centralizer. The centralizer includes at least one group of centralizer blocks. The centralizer block group includes a centralizer block 1 for embedding into the casing and slidably connected to the casing. The casing is provided with a centralizer hole for embedding and slidably connecting the centralizer block 1. There are at least two centralizer blocks 1 distributed along the circumference of the casing, and the two centralizer blocks 1 can be aligned along the circumference of the casing. The straightening holes are distributed in a uniform manner. The straightening blocks 1 are arranged in a one-to-one correspondence with the straightening blocks 1. Each straightening block 1 can be embedded and connected to the casing, so that the outer side of the straightening block 1 will not protrude from the outer wall of the casing. At the same time, the centralizer also includes a driving component for driving the straightening block 1 to move so that the straightening block 1 at least partially protrudes from the outer wall of the casing, that is, through the action of the driving component, each straightening block 1 can also be slidably displaced so as to protrude from the outer wall of the casing, forming a protrusion on the outer surface of the casing. With such arrangement, when the casing is lowered into the well, each straightening block 1 can be connected to the casing in an embedded state, and no large protruding section will be formed on the outer wall of the casing, which will not affect the operation of lowering the casing into the well. Compared with the centralizer in the prior art, there will be no problem that the centralizer is stuck by the well wall or collides with the well wall, causing damage or affecting the lowering of the well; after the casing is lowered into the well, each straightening block 1 is displaced under the action of the driving assembly and at least part of each straightening block 1 protrudes from the outer wall of the casing, such as Figure 2 As shown, after each straightening block 1 protrudes to a certain extent, it can press against the well wall outside the casing, that is, the outer side of each straightening block 1 can press against the well wall in the radial direction, and the inner side is connected to the casing, so that the directional force of the well wall can press against the casing.

[0031] Therefore, the double-base bridge inverted packer 13 blind plate drilling-free cementing device provided in this embodiment may include the following beneficial effects: at least two straightening blocks 1 distributed along the circumference of the casing will be displaced and protruded by the action of the driving component, and will both resist against the well wall. Under the reverse force of the well wall, the casing will produce a circumferential radial pressure on the casing, so that the casing section near the straightening block 1 can be aligned to the center of the wellbore; the straightening block 1 is set near the packer 13, so that at least the casing section near the packer 13 and the packer 13 are aligned relative to the central axis of the wellbore, and the centering of the casing section near the packer 13 and the packer 13 can be effectively adjusted to ensure that the annulus can be tightly sealed in the circumferential direction after the packer 13 expands, and a good annulus seal is achieved, thereby ensuring the stability and quality of the annulus cement pouring, and solving the problem in the prior art that the annulus is not tightly sealed due to poor casing centering, thereby affecting the cementing quality.

[0032] Each of the straightening blocks 1 can be in the shape of a long strip and extend along the axial direction of the casing. Each of the straightening blocks 1 can slide and displace along the radial direction of the casing. The straightening hole on the casing can be through-shaped along the radial direction. The shape of the straightening hole matches the shape of the straightening block 1, and the size is interference fit. In this way, the straightening block 1 only slides and displaces along the radial direction of the casing, and the action is simple, which facilitates the processing and connection of the straightening hole and the straightening block 1.

[0033] The driving assembly may include a base for pushing each straightening block 1 to move, and a driving structure for pushing the base to move. The straightening block 1 slides radially, and the base for pushing the straightening block 1 to move is arranged inside the casing. Therefore, the base may be slidably connected with the casing and slidably displaced along the axial direction of the casing. A pushing inclined surface 10 is arranged on the base, and an abutting inclined surface 101 for abutting against the pushing inclined surface 10 is arranged on the straightening block 1. The pushing inclined surface 10 and the abutting inclined surface 101 are both inclined along the axial direction of the casing, and the inclination directions of the two can match; and along the pushing direction, the pushing inclined surface 10 and the abutting inclined surface 101 gradually expand outward from the center of the casing. In this way, when the base moves along the axial direction of the casing, the straightening block 1 can be displaced radially toward the outside of the casing under the squeezing effect of the pushing inclined surface 10 and the restraining effect of the straightening hole, thereby protruding from the outer wall of the casing until it abuts against the well wall.

[0034] The driving structure may include a force-bearing surface that is connected to the casing lumen and connected to the base. The force-bearing surface may be directly arranged on the base or on a component connected to the base; the force-bearing surface may extend radially along the casing. When water is injected into the casing, the force-bearing surface located in the casing lumen will be pushed by the water flow, thereby driving the base to move axially along the casing by the thrust of the water flow, and then the base drives the straightening block 1 to move. With such an arrangement, there is no need to set additional driving power and complex transmission structure on the casing, and water flow can be used. In the cementing process, there is a link of injecting water into the casing to expand the expansion rubber cylinder of the packer 13. In the preferred embodiment, the water flow injected into the pipe for expanding the packer 13 can be directly used to push the base, which is convenient for operation and does not need to set too many components in the casing to affect the normal use of the well.

[0035] The straightening block 1 can be slidably arranged in the straightening hole. To prevent the straightening block 1 from falling out, the straightening block 1 can be connected to the casing or the base. The connection is arranged between the opposing pushing inclined surface 10 and the opposing inclined surface 101. The connecting member can be a connecting column or a locking pin that penetrates the straightening block 1 and the base. When the base is pushed and displaced, the pushing inclined surface 10 and the opposing inclined surface 101 are dislocated and moved, and the connecting column or the locking pin can be pulled off, thereby pushing the straightening block 1 and making the straightening block 1 protrude. In this way, the straightening block 1 can be prevented from falling out of the straightening hole of the casing in advance and separating from the casing, and the subsequent straightening operation will not be affected.

[0036] like Figure 1 As shown, the straightening blocks 1 in the same straightening block group are distributed along the circumference of the casing, and the push slope 10 on the base can be a plurality of straightening blocks 1 that correspond to each other one by one and are dispersedly arranged, or it can be one that extends along the circumference of the casing and forms an integrated structure. The push slope 10 can be a conical surface as a whole and be arranged coaxially with the casing.

[0037] The base includes a cylindrical or columnar connecting section, the outer diameter of which matches the inner diameter of the casing to achieve sliding connection with the casing, and the base also includes a gradually decreasing diameter contraction section, the outer surface of which forms a push slope 10, and the connecting section and the contraction section are arranged along the axial direction of the casing. When the straightening block 1 is against the well wall, the base can stop axial displacement under the action of the reverse force.

[0038] After cementing is completed, the lumen of the casing needs to be unobstructed for subsequent operations. Therefore, the base can be annular and have an inner hole that connects the connecting section and the contraction section. The base can be connected or contacted with the blind plate component in the cementing device. The blind plate component is slidably connected to the casing lumen and blocks the casing lumen, and then abuts against the base, or the blind plate component is directly connected to the base and covers the inner annulus of the base. The end face of the blind plate component can form the force-bearing surface of the base. When water is injected, the water flow hits the end face of the blind plate component to push the base to move.

[0039] In the prior art, a water injection channel 501 for connecting with the packer 13 is generally provided on the blind plate. However, in this embodiment, the blind plate component is displaced in the casing due to the need to push the base, and the water injection channel 501 may be formed by telescopic pipe fittings, or in this embodiment, the blind plate component includes a main blind plate 4 and a secondary blind plate 5, the main blind plate 4 is used to connect with the base and displace, and the secondary blind plate 5 is fixedly connected to the casing, and the water injection channel 501 is provided on the secondary blind plate 5. The secondary blind plate 5 is provided with a through hole for water flow to pass through to impact the main blind plate 4.

[0040] If there is only one straightening block set, it can be located near the packer 13, such as above or below. In order to enhance the straightening effect, the casing section where the packer 13 is located is kept well centered, such as Figure 1 As shown, the righting block group may be provided with two distributed along the axial direction of the casing, and the two righting block groups may be respectively provided at the axial ends of the packer 13, so that the centering degree of the packer 13 can be ensured. The base is also provided with two righting block groups corresponding to the two righting block groups, and are respectively recorded as the upper base 2 and the lower base 3. Obviously, the basic structures of the upper base 2 and the lower base 3 are the same as the structures of the bases described above. Along the well entry direction, the lower base 3 may be below the upper base 2. The lower base 3 may be connected to the main blind plate 4. A connecting piece may also be provided between the upper base 2 and the lower base 3 to enable the two bases to move synchronously.

[0041] In the prior art, the blind plate and the impact plug 14 are usually left in the casing. After cementing, the casing is penetrated by drilling holes in the impact plug 14 and the blind plate, which is easy to damage the casing and cause damage to the casing, which is not conducive to subsequent downhole operations. To solve this problem, in this embodiment, Figure 1-6 As shown, structures and components are provided for salvaging the blind plate components and the impact rubber plug 14.

[0042] Specifically, first, a single straightening block group and a base are provided as an embodiment, the main blind plate 4 is connected to the base, and at the same time, a connection structure for connecting the two and being able to separate or disconnect after being subjected to force is provided between the main blind plate 4 and the base, and the connection structure can be between the inner ring wall of the base and the outer wall of the main blind plate 4, and an anti-rearward movement structure for preventing the base from moving backward in the reverse direction is provided between the outer wall of the base and the sleeve, which can prevent the base from moving in the reverse direction; a first connection locking structure for connecting the impact plug 14 and the main blind plate 4 is provided between the impact plug 14 and the main blind plate 4, and the first connection locking structure can also have at least a unidirectional locking function. If a secondary blind plate 5 is provided, the secondary blind plate 5 is located on the side of the main blind plate 4 close to the impact plug 14, and a connection structure for disconnecting or separating under force can be provided between the secondary blind plate 5 and the sleeve, or it can be slidably connected to the sleeve through size matching.

[0043] Then, when water is injected into the casing, the water flow hits the main blind plate 4, the main blind plate 4 moves with the base, and the straightening block 1 is pushed out to straighten it; after straightening and the packer 13 expands, cement slurry is injected into the casing, and the cement slurry flows into the annulus outside the pipe through the mud through hole on the casing wall to seal the annulus between the well wall and the casing. After the cement slurry is injected, the impact rubber plug 14 enters the casing, and moves toward the blind plate component under the push of the water flow and pushes the cement slurry so that all the cement slurry enters the annulus. When the impact rubber plug 14 touches the main blind plate 4, it can be connected to the main blind plate 4 through the first connection locking structure. When the first connection locking structure has a locking function, the locking direction of the first connection locking structure is set to be upward from the main blind plate 4 to the wellhead. direction, the impact rubber plug 14 and the main blind plate 4 can have a locking connection effect in the upward direction to achieve a stable connection; when the impact rubber plug 14 is pulled, the impact rubber plug 14 pulls the main blind plate 4 toward the wellhead, and the base is locked by the anti-backward movement structure between the casing and cannot move, which will produce a misaligned and separated force situation with the main blind plate 4; the connection structure between the main blind plate 4 and the base is separated or disconnected due to the force, and the main blind plate 4 is separated from the base and pulled out of the well together with the impact rubber plug 14; if a secondary blind plate 5 is provided, the secondary blind plate 5 can be impacted during the pulling process of the main blind plate 4, so that the secondary blind plate 5 is separated from the casing, and then the secondary blind plate 5 is pushed to be pulled out of the well, and only the annular base remains in the casing, and the lumen resumes the conductive state.

[0044] With such arrangement, after the impact-pressure plug 14 and the blind plate component are synchronously pulled or salvaged out of the well, the casing lumen is restored to communication, and drilling is not required. Relatively speaking, the intensity and difficulty of the operation are reduced, and the casing will not be affected by the drilling to cause the wall to become thinner or be cracked or leaked. There is no remaining cementing device in the pipe, and there is no shrinkage. The entire casing lumen is in an equal-diameter conductive state with the same inner diameter, and will not cause jamming of subsequent downhole tools, which is conducive to subsequent downhole operations. The problem of easy jamming of downhole tools and operation accidents in the prior art is solved, and the safety, convenience and smoothness of the operation are improved.

[0045] Secondly, in this embodiment, there are two groups of straightening block groups and two bases, namely an upper base 2 and a lower base 3; the lower base 3 is connected to the main blind plate 4 of the blind plate component, and the main blind plate 4 forms the force-bearing surface of the lower base 3 in the driving structure. At the same time, in the present embodiment, the driving assembly also includes a connecting component, which is arranged in the casing cavity, one end of which is fixedly connected to the main blind plate 4, and the other end is detachably connected to the upper base 2 through a connecting structure. Then, through the connecting component, the upper base 2 is connected to the lower base 3 and can be displaced synchronously; at the same time, the driving structure that drives the two bases to move or drives the connecting component to move includes a bridge channel 7 arranged on the connecting component, the bridge channel 7 is isolated from the casing cavity between the upper base 2 and the lower base 3, and one end of the bridge channel 7 is against the main blind plate 4, and the other end passes through the upper base 2 and is connected to the casing cavity on the other side of the upper base 2, then one end of the bridge channel 7 is connected to the force-bearing surface of the lower base 3, and the other end can be used for water flow to flow in and can also be connected to the force-bearing surface of the upper base 2; at the same time, it can also prevent water from entering the casing cavity between the upper base 2 and the lower base 3, so as to prevent inconvenience in lifting and salvage. When water is injected into the casing lumen, the water flow can contact the force-bearing surface of the upper base 2 and provide thrust to the upper base 2, and the water flow enters the bridge channel 7, which can hit the end face of the main blind plate 4, that is, the force-bearing surface of the lower base 3, and push the lower base 3. The lower base 3 is connected to the upper base 2 by a connecting component. Then, the two bases can be displaced synchronously under the push of the water flow, so that the straightening blocks 1 of the two straightening block groups are synchronously raised, the casing is straightened, and a good straightening effect is achieved.

[0046] The first connection locking structure can be arranged on the connection component. When lifting is required, the upper base 2 is locked by the anti-backward movement structure between the casing and will not move. The connection component is separated from the upper base 2, and the lower base 3 is locked by the anti-backward movement structure between the casing and is separated from the main blind plate 4 by displacement. The connection component is pulled out of the well with the main blind plate 4 along with the impact rubber plug 14.

[0047] The connecting component may include a central tube 6 coaxially arranged with the casing, and the open lumens at both ends of the central tube 6 form a bridge channel 7. The second end of the centerline tube abuts against and is sealed against the end face of the main blind plate 4, and the first end passes through the upper base 2. Such an arrangement has a simple structure, is easy to implement, and is easy to process. The auxiliary blind plate 5 may be annular and sleeved on the central tube 6, so that the driving of the main blind plate 4 will not be affected. At the same time, the water injection channel 501 on the auxiliary blind plate 5 for injecting water into the packer 13 may be connected to the bridge channel 7. While the injected water flow pushes the straightening block 1 for straightening, water can be injected into the packer 13 to expand the expansion rubber cylinder of the packer 13. Two operations of straightening and expansion can be completed by one water injection, which simplifies the cementing process.

[0048] A water injection hole is provided on the wall of the central tube 6 in a radially through-shaped manner. The positions of the auxiliary blind plate 5 and the packer 13 on the casing are arranged relative to each other. The water injection hole is arranged to match the position of the water injection channel 501 on the auxiliary blind plate 5. One end of the water injection channel 501 is connected to the water injection hole, and the other end passes through the casing and is connected to the expansion rubber tube of the packer 13. A valve for conducting or cutting off can also be provided on the water injection channel 501. The valve can be set as a one-way valve that automatically opens under the pressure of the water flow. In this way, conducting or blocking does not require too many additional operations, avoiding increasing the difficulty of the operation.

[0049] After the expansion rubber tube of the packer 13 expands, cement slurry needs to be injected into the annulus above the packer 13, that is, the annulus between the packer 13 and the ground. Therefore, the mud channel 12 connecting the casing cavity and the mud through hole on the casing wall is arranged on the first end of the connecting component or on the upper base 2, and the first connecting locking structure used to connect the impact rubber plug 14 is also arranged at the first end of the connecting component.

[0050] The connecting component includes a central tube 6, the upper base 2 is sleeved on the first end of the central tube 6, and the connecting component also includes a lifting canister 8 sleeved and fixedly connected to the first end of the central tube 6, the outer wall of the lifting canister 8 is detachably connected to the inner ring wall of the upper base 2, and the first connection locking structure is arranged in the lifting canister 8. After the impact plug 14 enters the well, it will be connected to the lifting canister 8. The connecting component can also include a plug tube 9, the inner tube wall of one end of the plug tube 9 is connected to the lifting canister 8, the outer tube wall is detachably connected to the inner ring wall of the upper base 2, and the other end extends to the side of the lifting canister 8 away from the central tube 6, then the impact plug 14 enters the plug tube 9 and then connects to the lifting canister 8, at the same time, the inner diameter of the tube cavity of the plug tube 9 is smaller than the outer diameter of the impact plug 14, and the material of the plug tube 9 can be plastic, which plays a role in holding the impact plug 14. When pulling, the upper base 2 is locked by the anti-backward movement structure between the casing and will not move, the plug tube 9 is separated from the upper base 2, and because the plug tube 9, the lifting canister 8, the central tube 6 and the main blind plate 4 are firmly connected, the main blind plate 4 is pulled synchronously and separated from the locked lower base 3 at the same time, the main blind plate 4, the central tube 6, the lifting canister 8 and the plug tube 9 are lifted synchronously, and the secondary blind plate 5 is driven to separate from the casing during the displacement process, so the main blind plate 4, the central tube 6, the lifting canister 8, the plug tube 9 and the secondary blind plate 5 can all be pulled out of the well. Only the annular upper base 2 and the lower base 3 remain in the casing, and the lumen is in a conducting state.

[0051] The first through holes 121 in the radial direction are provided on the cylinder wall of the plug cylinder 9 and the side wall of the annular upper base 2. The two first through holes 121 are connected. After the upper base 2 is displaced into place, the two first through holes 121 are aligned with and connected to the mud through holes on the casing to form a mud channel 12. Alternatively, the straightening block 1 connected to the upper base 2 is also provided with a second through hole 122 or opening in the radial direction. The second through hole 122 or opening is located in the straightening hole and penetrates the casing wall to form a mud through hole. That is, the two first through holes 121 on the plug cylinder 9 and the upper base 2 will be aligned with and connected to the second through hole 122 or opening on the straightening block 1 connected to the upper base 2 to form a mud channel 12 after the upper base 2 and the plug cylinder 9 are displaced into place.

[0052] Specifically, the connection structure of the main blind plate 4 and the base or lower base 3 of the blind plate component may include a connecting pin 102, which can be realized by connecting the main blind plate 4 and the lower base 3 through the connecting pin 102. In this way, when the main blind plate 4 is subjected to a pulling force, the connecting pin 102 is broken by the force, and the two can be separated, and the blind plate component can be smoothly pulled out of the well. The connection structure between the auxiliary blind plate 5 and the casing may also be a connecting pin 102, or a snap connection, that is, a groove is provided on one, and a protrusion for snapping into the groove is provided on the other. The connection between the upper base 2 and the rubber plug tube 9 and the lifting bucket 8 may also be set in this way, and may be a connecting pin 102, or a snap connection.

[0053] As for the anti-backward movement structure between the sleeve and a single base or between the upper base 2 and the lower base 3, a concave groove can be provided on the outer wall of the connecting section of the upper base 2 and the lower base 3, and an elastic locking claw 11 is embedded in the groove. The groove can be annular, and the elastic locking claw 11 can also be an integral ring, or a plurality of blocks distributed along the circumference of the annular groove. In the depth direction of the groove, that is, in the radial direction of the sleeve, the thickness of the elastic locking claw 11 in the natural state is greater than the concave depth of the groove. When the upper base 2 and the lower base 3 do not move, the groove is blocked by the inner wall of the sleeve, and the elastic locking claw 11 is in a compressed state in the groove; when the upper base 2 and the lower base 3 are displaced, the groove is opposite to the straightening hole, and the elastic locking claw 11 is no longer pressed by the inner wall of the sleeve, and returns to the natural state, and a part of it extends out of the groove to form a bulge on the outer wall of the upper base 2 and the lower base 3. When the upper base 2 and the lower base 3 move in opposite directions, the elastic locking claw 11 will abut against the wall of the straightening hole, that is, the inner wall of the casing, to prevent the upper base 2 and the lower base 3 from moving backward, so that the upper base 2 and the pulled plug tube 9 are relatively dislocated and separated, and the lower base 3 and the main blind plate 4 are relatively dislocated and separated. At the same time, the straightening block 1 is pressed against the well wall, and the well wall has a reverse pressure on the upper base 2 and the lower base 3, which can also play a role in locking the upper base 2 and the lower base 3.

[0054] The pressure plug 14 can be pulled by connecting a pulling rope or tool to the pressure plug 14 before going down the well, or by lowering the fishing tool after the pressure plug 14 is lowered into the well and solidified. Figure 4 and Figure 5As shown, the drill-free blind plate cementing device also includes a salvage tube 15. One of the impact plug 14 or the salvage tube 15 is provided with a second connecting locking structure for connecting with the other. The second connecting locking structure may also have a one-way locking function. When the salvage tube 15 is lowered into the casing at the wellhead, after the salvage tube 15 touches the impact plug 14, the two are connected through the second connecting locking structure. The locking direction of the second connecting locking structure is set to the upward direction toward the wellhead. When the salvage tube 15 and the impact plug 14 are pulled up for salvage, they will be firmly connected. The salvage tube 15, the impact plug 14, the connecting component and the blind plate component can be salvaged out of the well at one time, and the operation is convenient and smooth.

[0055] Specifically, the first connection locking structure and the second connection locking structure both include an external clamping tooth provided on the impact rubber plug 14, a clamping claw 16 connected to the lifting bucket 8 and the overshot bucket 15 respectively and used to clamp the impact rubber plug 14, and a connecting clamping tooth 162 provided on the inner wall of the clamping claw 16 and used to mesh with the external clamping tooth. Figure 4 and Figure 5 As shown, the impact plug 14 includes a plug body and a plug head and a plug handle located at both ends of the plug body. The outer diameters of the plug head and the plug handle are smaller than the outer diameter of the plug body. External teeth are arranged on the outer walls of the plug head and the plug handle. The outer diameter of the plug body is set corresponding to the inner diameter of the plug tube 9. The lifting scoop 8 and the overshot 15 can be provided with a plurality of locking pieces 161 distributed along the circumferential direction. On the lifting scoop 8 and the overshot 15, each locking piece 161 is arranged along the circumferential direction to form a cylindrical clamping claw 16. At the same time, the bottom end of each locking piece 161 is fixedly arranged, such as being connected to the bottom plate, or the bottom end of each locking piece 161 is connected together to form an integrated structure, and a gap is arranged between each adjacent two locking pieces 161 along the circumferential direction. The gap forms a micro-motion space above the bottom end of each locking piece 161, so that the cavity of the clamping claw 16 has a certain degree of telescopic elasticity. At the same time, a connecting tooth 162 is provided on the inner wall of the clamping claw 16. When the impact rubber plug 14 is displaced under the push of water pressure, the cavity of the clamping claw 16 can be opened, and the plug head extends into the clamping claw 16 of the lifting bucket 8. Then the impact rubber plug 14 stops moving, and the outer tooth can be engaged with the connecting tooth 162. The cavity of the clamping claw 16 is retracted under the elastic retraction effect, and the clamping claw 16 as a whole can hold the plug head of the impact rubber plug 14. Similarly, when the overshot 15 is pushed to hit the impact rubber plug 14, the plug handle of the impact rubber plug 14 can open the cavity of the clamping claw 16 of the overshot 15 and extend into the clamping claw 16, so as to be tightly connected with the overshot 15. With such arrangement, the impact rubber plug 14 can achieve a tight locking connection with the lifting bucket 8 and the overshot bucket 15, and the meshing tooth connection can play a one-way locking function, which can effectively prevent separation or disconnection between each other.

[0056] Furthermore, the connecting teeth 162 may be in a ratchet shape, and the entire tooth groove or the stepped tooth surface abutting against the outer teeth may be inclined from the inside to the outside and from the cavity opening to the cavity bottom. This arrangement may enhance the one-way locking function of the first connecting locking structure and the second connecting locking structure.

[0057] It should be noted that the words "first", "second" and the like used herein are not intended to limit a specific order, but are merely used to distinguish between various components or functions. The words "horizontal", "vertical", "upper", "lower", "left" and "right" used herein refer to the cementing device when it is in a naturally placed state.

[0058] It is understood that the same or similar parts in the above embodiments can refer to each other, and the content not described in detail in some embodiments can refer to the same or similar content in other embodiments. The multiple solutions provided by the present invention include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0059] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-base bridge inverted packer cementing device without drilling blind plates, characterized in that: The invention comprises a pressure plug (14), a packer (13) connected to the casing, a blind plate component and a centralizer, the centralizer comprising at least one centralizer block group, the centralizer block group comprising a centralizer block (1) embedded in the casing and slidably connected to the casing, at least two centralizer blocks (1) are distributed along the circumference of the casing, and the centralizer further comprises a driving component for driving the centralizer block (1) to move so that the centralizer block (1) protrudes from the outer wall of the casing; The driving assembly comprises a base for pushing the displacement of the straightening block, and a driving structure for pushing the displacement of the base, the driving structure comprising a force-bearing surface communicated with the sleeve lumen and connected to the base, the base is slidably connected to the sleeve and slidably displaced along the axial direction of the sleeve, the base is provided with a pushing inclined surface (10) for abutting against the straightening block (1), and the pushing inclined surface (10) is gradually inclined along the axial direction of the sleeve; each straightening block (1) is slidably displaced along the radial direction of the sleeve and extends along the axial direction, and each straightening block (1) is provided with a resisting inclined surface (101) for abutting against the pushing inclined surface (10), and the resisting inclined surface (101) is inclined along the axial direction of the sleeve, and the inclination direction matches the pushing inclined surface (10); The base is annular, the blind plate component comprises a main blind plate (4), the main blind plate (4) blocks the inner annular space of the base, and a connecting structure connecting the two and being separable or disconnectable is provided between the main blind plate (4) and the inner annular wall of the base, an anti-backward movement structure for preventing the base from moving in the opposite direction is provided between the base and the casing, and a first connecting locking structure for connecting the impact rubber plug (14) and the main blind plate (4) is provided between the impact rubber plug (14) and the main blind plate (4); It also includes a salvage tube (15), wherein a second connection and locking structure connecting the salvage tube (15) and the impact rubber plug (14) is provided between the salvage tube (15) and the impact rubber plug (14); The anti-backward movement structure comprises a groove provided on the outer wall of the base and an elastic locking claw (11) embedded in the groove, wherein the thickness of the elastic locking claw (11) in a natural state is greater than the depth of the groove; The straightening block groups are provided with two distributed along the axial direction of the casing, and the base is provided with two corresponding to the two straightening block groups, and are respectively provided as an upper base (2) and a lower base (3); The lower base (3) is connected to the main blind plate (4) via the connecting structure. The driving assembly further comprises a connecting component, a first end of the connecting component is detachably connected to the upper base (2), and a second end is fixedly connected to the main blind plate (4). The first connecting locking structure is arranged on the connecting component. The driving structure comprises a bridge channel (7) arranged on the connecting component, one end of the bridge channel (7) is against the main blind plate (4), and the other end passes through the upper base (2) and is connected to the sleeve lumen on the other side of the upper base (2).

2. The double-base bridge inverted packer cementing device without drilling blind plates as claimed in claim 1, characterized in that: A mud channel (12) is provided on the first end of the connecting component or the upper base (2) for communicating with the casing lumen and the mud through hole on the casing wall.

3. The double-base bridge inverted packer cementing device without drilling blind plates as claimed in claim 2, characterized in that: The connecting component comprises a central tube (6) connecting the main blind plate (4) and the upper base (2), the tube cavities of the central tube (6) being open at both ends forming the bridge channel (7), and the upper base (2) being sleeved on the first end of the central tube (6); the connecting component also comprises a lifting bucket (8) sleeved on and fixedly connected to the first end of the central tube (6), the lifting bucket (8) being detachably connected to the inner ring wall of the upper base (2), and the first connection locking structure being arranged in the lifting bucket (8); the mud channel (12) comprises through holes which are respectively arranged on the upper base (2) and the straightening block (1) connected to the upper base (2) and are all through holes in a radially penetrating shape.

4. The double-base bridge inverted packer cementing device without drilling blind plates as claimed in claim 3, characterized in that: The blind plate component further comprises a secondary blind plate (5) which is annular and sleeved on the central tube (6); the secondary blind plate (5) is provided with a water injection channel (501) which at least partially connects the bridge channel (7) and the packer (13); a water injection through hole connected to the water injection channel (501) is provided on the wall of the central tube (6); and a valve for conducting or shutting off is provided on the water injection channel (501).

5. The double-base bridge inverted packer cementing device without drilling blind plates as claimed in claim 3, characterized in that: The first connection locking structure and the second connection locking structure both comprise an external clamping tooth provided on the impact rubber plug (14), a clamping claw (16) respectively connected to the lifting bucket (8) and the overshot bucket (15) and used to clamp the impact rubber plug (14), and a connecting clamping tooth (162) provided on the inner wall of the clamping claw (16) and used to mesh with the external clamping tooth.

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