Large-size drilling-free packing type grading cementing device and pipe string sleeve

Abstract

The invention provides a large-size drilling-free packing type graded cementing device and a casing string, the casing string comprises the graded cementing device, the graded cementing device comprises a body, and a circulating hole and a liquid injection hole are formed in the body; the rubber sleeve is arranged on the outer side of the body, an expandable space is formed between the rubber sleeve and the body, and the two ends of the rubber sleeve are connected to the body in a sealed mode. The liquid injection hole is communicated with the expandable space; when the circulating hole is opened, the circulating hole is used for communicating with the external space of the body and injecting cement into an annular space between the body and the well wall.

Description

Technical Field

[0001] The present invention relates to a large-size non-drilling packer-type staged cement injector and a pipe string sleeve, belonging to the field of oil and gas exploration and development or compressed air energy storage. Background Art

[0002] Under the general background of accelerating the speed and improving the efficiency in the field of oil and gas exploration and development, each oilfield company urgently needs to optimize the construction technology at each stage to improve the construction efficiency. The large-size casing staged cementing technology conducts the cementing operation in two times. It can not only reduce the cementing construction pressure and the risk of fracturing the formation, but also reduce the influence of different temperatures above and below the wellbore on the performance of the cement slurry. However, the large-size casing staged cementing technology has the problems that the pipe wall diameter is large, the mixing of the drilling fluid and the cement slurry is serious when the drilling fluid displaces the cement slurry, and the displacement efficiency is low; after the first-stage cementing, it is necessary to wait for more than 24 hours for setting before the second-stage cementing operation, which affects the construction efficiency; for large-size casing cementing, a rubber plug is needed to isolate the drilling fluid and the cement slurry, and the later drilling and removing efficiency of the rubber plug level bumping seat is low, which affects the well construction cost. Summary of the Invention

[0003] Aiming at the above technical problems existing in the prior art, the present invention provides a large-size non-drilling packer-type staged cement injector. By using the inner-insertion method for cementing, it reduces the problems such as poor isolation effect between the cement slurry and the drilling fluid in large-size casing cementing and low drilling and removing efficiency of the rubber plug. Through the packer staged cementing technology, after the first-stage cementing, the packer is expanded and sealed, and there is no need to wait for 24 hours for setting time, and the second-stage cementing construction operation can be directly carried out.

[0004] In addition, the present invention also provides a pipe string sleeve.

[0005] According to one aspect of the present invention, a large-size non-drilling packer-type staged cement injector is provided, which is characterized by comprising: A body, on which a circulation hole and a liquid injection hole are arranged; and A rubber cylinder arranged outside the body, an expandable space is formed between the rubber cylinder and the body, and both ends of the rubber cylinder are hermetically connected to the body.

[0006] Wherein, the liquid injection hole communicates with the expandable space; when the circulation hole is opened, it is used to communicate with the external space of the body for injecting cement into the annulus between the body and the well wall.

[0007] A further improvement of the present invention is that it further comprises a grouting drill tool, and a sealing joint is arranged at the lower end of the grouting drill tool.

[0008] A further improvement of the present invention is that a ball seat is arranged inside the sealing joint, and a flow-through hole is arranged on the side surface of the sealing joint, and the flow-through hole is arranged above the ball seat; Wherein, by moving the position of the grouting drill tool, the flow-through hole is selectively communicated with the circulation hole or the liquid injection hole.

[0009] A further improvement of the present invention lies in that an upper seal and a lower seal are provided on the outer wall of the sealing joint, and the upper seal and the lower seal are configured to be able to seal the annulus between the sealing joint and the inner wall of the body; And, the upper seal is arranged above the flow-through hole, and the lower seal is arranged below the flow-through hole.

[0010] A further improvement of the present invention lies in that the lower end of the rubber cylinder is fixedly and sealedly connected to the body through a lower rubber cylinder joint, and the upper end of the rubber cylinder is slidably and sealedly connected to the body through an upper rubber cylinder joint; Initially, the upper rubber cylinder joint is in a first position. When fluid is injected into the expandable space to expand the rubber cylinder, the upper rubber cylinder joint moves downward to a second position.

[0011] A further improvement of the present invention lies in that when the upper rubber cylinder joint is in the first position, the upper rubber cylinder joint blocks the circulation hole, and the circulation hole is in a closed state; When the upper rubber cylinder joint is in the second position, the upper rubber cylinder joint moves away from the circulation hole, so that the circulation hole is opened.

[0012] A further improvement of the present invention lies in that a first anti-retreat snap spring is provided on the upper rubber cylinder joint, and a first snap spring groove is provided on the outer wall of the body. When the upper rubber cylinder joint is in the second position, the first anti-retreat snap spring is clamped in the first snap spring groove.

[0013] A further improvement of the present invention lies in that an annular groove is provided in the upper part of the inner wall of the body, and the circulation hole is provided in the lower part of the annular groove; A hole-closing sleeve is arranged in the annular groove. When the hole-closing sleeve is in the initial position and above the circulation hole; when the hole-closing sleeve is in the hole-closing position, it blocks the circulation hole.

[0014] A further improvement of the present invention lies in that when the hole-closing sleeve is in the initial position, there is a certain distance between the upper end of the hole-closing sleeve and the upper end of the annular groove, forming a pressure groove; when the moving position of the grouting drill tool makes the flow-through hole communicate with the pressure groove, the pressure applied through the grouting drill tool acts in the pressure groove, thereby driving the hole-closing sleeve to move from the initial position to the hole-closing position.

[0015] A further improvement of the present invention lies in that a second anti-retreat snap ring is provided on the hole-closing sleeve, a second snap ring groove is provided in the annular groove, and when the hole-closing sleeve is in the hole-closing position, the second anti-retreat snap ring is clamped in the second snap ring groove.

[0016] A further improvement of the present invention lies in that initially, the upper joint of the rubber barrel is connected to the body through a first connecting member, and the hole-closing sleeve is connected to the body through a second connecting member.

[0017] According to another aspect of the present invention, a pipe string sleeve is also proposed, including: A large-size casing string in which a large-size non-drilling packer type stage cementing device is provided; A float collar and a float shoe provided at the lower end of the large-size casing string.

[0018] Compared with the prior art, the present invention has the following advantages.

[0019] According to the large-size non-drilling packer type stage cementing device of the present invention, by using the internal plugging method for cementing, problems such as poor isolation effect between the cement slurry and drilling fluid during large-size casing cementing and low efficiency of plug removal are reduced; through the packer stage cementing process, the packer is expanded after the first-stage cementing, and there is no need to wait for 24 hours for the setting time, and the second-stage cementing operation can be directly carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings: Figure 1 Shows a schematic structural view of a large-size non-drilling packer type stage cementing device according to an embodiment of the present invention; Figure 2 Shows a schematic structural view of a large-size non-drilling packer type stage cementing device according to an embodiment of the present invention, showing the state where the flow-through hole is connected to the liquid injection hole; Figure 3 Shows a schematic structural view of a large-size non-drilling packer type stage cementing device according to an embodiment of the present invention, showing the state after the rubber barrel expands; Figure 4 Shows a schematic structural view of the upper joint of the rubber barrel according to an embodiment of the present invention, showing the state when the upper joint of the rubber barrel is in the second position; Figure 5 Shows a schematic structural view of a large-size non-drilling packer type stage cementing device according to an embodiment of the present invention, showing the state where the flow-through hole is connected to the circulation hole; Figure 6 Shows a schematic structural view of a large-size non-drilling packer type stage cementing device according to an embodiment of the present invention, showing the state where the flow-through hole is connected to the pressure groove; Figure 7 The following is a schematic structural view of a large-diameter non-drilling packer-type staged cement injector according to an embodiment of the present invention, showing the state of the hole-closing sleeve in the hole-closing position; Figure 8 The following is a schematic structural view of the hole-closing sleeve according to an embodiment of the present invention, showing the state of the second anti-back-off snap spring when in the hole-closing position; Figure 9 The following is a schematic structural view of a large-diameter non-drilling packer-type staged cement injector according to an embodiment of the present invention, showing the state when the grouting drill tool is removed; It should be noted that the drawings are not necessarily drawn to actual scale.

[0021] The meanings of the reference numerals in the drawings are as follows: 1, upper sub; 2, body, 21, breathing hole, 22, circulation hole, 23, liquid injection hole, 24, annular groove; 3, rubber barrel, 31, expansion and sealing shear pin, 32, rubber barrel upper sub, 33, first anti-back-off snap spring, 34, rubber barrel lower sub; 4, hole-closing sleeve, 41, hole-closing shear pin, 42, second anti-back-off snap spring; 5, drill pipe sub; 6, sealing joint, 61, upper seal, 62, flow-through hole, 63, lower seal, 64, pressure buildup ball. Detailed implementation manners

[0022] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. And without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0023] In the context of accelerating the speed and efficiency in the field of oil and gas exploration and development, each oilfield company urgently needs to optimize the construction processes at all stages to improve the construction efficiency. The large-diameter casing staged cementing process conducts the cementing operation in two times. It can not only reduce the cementing construction pressure and the risk of fracturing the formation, but also reduce the influence of different temperatures up and down the wellbore on the performance of the cement slurry. However, the large-diameter casing staged cementing process has the following problems: the pipe wall diameter is large, the mixing is serious when the drilling fluid displaces the cement slurry, and the displacement efficiency is low; it is necessary to wait for coagulation for more than 24 hours after the first-stage cementing before the second-stage cementing operation can be carried out, which affects the construction efficiency; when cementing large-diameter casings, a rubber plug is required to isolate the drilling fluid and the cement slurry, and the later drilling removal efficiency of the rubber plug-level bump pressure seat is low, which affects the well construction cost.

[0024] To solve the above problems, the present invention proposes a large-size non-drilling packer-type staged cement injector, which uses the internal plugging method for cementing to reduce the problems such as poor isolation effect between the cement slurry and drilling fluid in large-size casing cementing and low efficiency of plug removal; through the packer staged cementing process, after the first-stage cementing, the packer is expanded and sealed, and there is no need to wait for 24 hours of setting time, and the second-stage cementing operation can be directly carried out.

[0025] In the embodiment as Figure 1 shown, the large-size non-drilling packer-type staged cement injector according to the present invention includes: A body 2, the body 2 is of a cylindrical structure, an upper joint 1 is provided at the upper end of the body 2, and a lower joint is provided at the lower end.

[0026] A rubber cylinder 3 provided on the body 2, the rubber cylinder 3 is provided on the outside of the body 2, and an expandable space is formed between the rubber cylinder 3 and the body 2, and both ends of the rubber cylinder 3 are hermetically connected to the body 2.

[0027] Circulation holes 22 and liquid injection holes 23 are provided on the body 2, and the liquid injection holes 23 communicate with the expandable space.

[0028] Preferably, a check valve is provided in the liquid injection hole 23 to ensure that the fluid can flow into the expandable space without backflow.

[0029] When the circulation holes 22 are opened, they are used to communicate with the external space of the body 2 for injecting cement into the annulus between the body 2 and the wellbore wall.

[0030] In the non-drilling packer-type staged cement injector of the size according to this embodiment, it can cooperate with the grouting drill tool to complete the expansion and setting, and inject the cement slurry through the circulation holes 22.

[0031] In one embodiment, the large-size non-drilling packer-type staged cement injector further includes a grouting drill tool for cooperative use, and a sealing joint 6 is provided at the lower end of the grouting drill tool.

[0032] In this embodiment, an overflow hole 62 is provided on the side of the sealing joint 6, and the position of the overflow hole 62 can be adjusted according to the depth of the grouting drill tool, so that the overflow hole 62 is aligned with the liquid injection hole 23, and the fluid can be injected into the liquid injection hole 23, so that the expandable space is filled with liquid, so that the rubber cylinder 3 expands to block between the body 2 and the wellbore wall, and the setting is completed.

[0033] By moving the position of the grouting drill tool, the overflow hole 62 is aligned with the circulation hole 22, and the cement slurry is injected through the grouting drill tool, and the second-stage cementing is completed through the circulation hole 22.

[0034] In one embodiment, as Figure 2As shown, a ball seat is provided in the sealing joint 6. A pressure holding ball 64 is inserted, and the pressure holding ball 64 falls into the ball seat to block the outlet at the lower end, and the fluid is discharged through the flow hole 62, thereby being injected into the injection hole 23 to drive the rubber cylinder 3 to expand or injected into the circulation hole 22 for secondary cementing.

[0035] In using the process-sized drill-free isolation type staged cementing device according to the present embodiment, before cementing, the large-sized drill-free isolation type staged cementing device described in the present embodiment is connected to the casing and lowered to the designed depth. After the casing is in place, the grouting drill tool is lowered into the casing and lowered to the floating collar position of the casing to perform primary cementing.

[0036] During the first-level cementing, cement slurry is injected through the grouting drill bit, and the cement slurry enters the annulus between the casing and the well wall from the lower end of the casing. After the cement slurry is injected, the drilling fluid is used to replace the slurry. Since the inner diameter of the drill bit is small, the serious mixing of the replacement cement slurry and the drilling fluid in the large-sized casing is avoided. At the same time, the sealing joint 6 is used to achieve the sealing of the drill bit and the casing, without the need for additional sealing plugs and sealing sockets.

[0037] After the first stage of cementing, lift the drill string to the location of the large-size drill-free packer-type staged cementing device. Figure 2 As shown, the ball is thrown to hold the pressure and the packer is expanded and sealed (such as Figure 3 As shown in the figure), secondary cementing construction can be carried out directly.

[0038] During secondary cementing, cement slurry is directly injected from the drill bit, and drilling fluid is used to replace the cement slurry after the cement slurry is injected. Due to the small inner diameter of the drill bit, the serious mixing of cement slurry and drilling fluid in large-sized casing is avoided.

[0039] After the secondary cementing, the drilling tool can be lifted up to achieve the full bore of the casing, avoiding the problems of difficulty in drilling out the large-sized casing rubber plug and plug seat.

[0040] In a preferred embodiment, an upper seal 61 and a lower seal 63 are provided on the outer wall of the sealing joint 6 , and the upper seal 61 and the lower seal 63 are configured to seal the annular space between the sealing joint 6 and the inner wall of the body 2 .

[0041] Furthermore, the upper seal is disposed above the flow hole 62 , and the lower seal 63 is disposed below the flow hole 62 .

[0042] In this embodiment, the upper sealing member 61 is an upper rubber bowl, and the lower sealing member 63 is a lower rubber bowl.

[0043] When the overflow hole 62 is aligned with the liquid injection hole 23, the upper rubber bowl seals the annulus above the overflow hole 62 and the liquid injection hole 23, and the lower rubber bowl seals the annulus below the overflow hole 62 and the liquid injection hole 23, ensuring that the fluid inside the grouting drill can enter the liquid injection hole 23 through the overflow hole 62.

[0044] By the same principle, when the overflow hole 62 is aligned with the circulation hole 22, the upper rubber bowl seals the annulus above the overflow hole 62 and the circulation hole 22, and the lower rubber bowl seals the annulus below the overflow hole 62 and the circulation hole 22, ensuring that the cement slurry inside the grouting drill can enter the circulation hole 22 through the overflow hole 62, thereby performing the secondary cementing operation.

[0045] In one embodiment, the lower end of the rubber cylinder 3 is fixedly and sealingly connected to the body 2 through a lower rubber cylinder joint 34, and the upper end of the rubber cylinder 3 is slidably connected to the body 2 through an upper rubber cylinder joint 32, remaining in a sealed state during the sliding process.

[0046] Initially, the upper rubber cylinder joint 32 is in a first position (as Figure 2 shown). When fluid is injected into the expandable space to expand the rubber cylinder 3, since the rubber cylinder 3 expands radially outward, the upper rubber cylinder joint 32 will move downward axially, thus moving from the first position to the second position (as Figure 3 shown).

[0047] In a preferred embodiment, the upper rubber cylinder joint 32 is an annular section sleeved on the body 2, which has a certain width to ensure that it can block the circulation hole 22 when in the first position. At this time, the circulation hole 22 is in a closed state. When the upper rubber cylinder joint 32 is in the second position, the upper rubber cylinder joint 32 moves away from the circulation hole 22, opening the circulation hole 22.

[0048] In the large - size drill - free packer - type stage cementing device according to this embodiment, by the way of the sliding of the upper rubber cylinder joint 32, it is ensured that when the rubber cylinder 3 expands, it can expand radially to the maximum extent, so as to be able to squeeze against the wellbore wall to achieve sealing.

[0049] At the same time, the opening and closing of the circulation hole 22 can be realized by the movement of the upper rubber cylinder joint 32.

[0050] In one embodiment, as Figure 4 shown, a first anti - withdrawal snap ring 33 is provided on the upper rubber cylinder joint 32, and a first snap - ring groove is provided on the outer wall of the body 2. When the upper rubber cylinder joint 32 is in the second position, the first anti - withdrawal snap ring 33 is clamped in the first snap - ring groove.

[0051] In this embodiment, the upper rubber cylinder joint 32 is initially connected to the body 2 through a first connecting member.

[0052] In one embodiment, the first connecting member is an expansion-sealing shear pin 31, and the upper joint 32 of the rubber barrel is connected to the body 2 through the expansion-sealing shear pin 31 to ensure that the rubber barrel 3 will not be prematurely expanded and sealed.

[0053] In another embodiment, the first connecting member may be another snap ring groove provided on the outer side of the body 2. Initially, the first anti-retreat snap ring 33 can be clamped in the first snap ring groove.

[0054] After the first-stage cementing, when the drill string is lifted to the position of the large-size drill-free packer-type stage cementing device, the flow-through hole 62 is aligned with the liquid injection hole 23, and a ball is dropped and pressure is applied. When the pressure reaches the set value, the expansion-sealing shear pin 31 is cut off under the action of the pressure, so that the rubber barrel 3 can expand smoothly. After the first anti-retreat snap ring 33 is clamped in the first snap ring groove, the expansion-sealing packer is completed. In this way, the second-stage cementing construction can be directly carried out.

[0055] In one embodiment, as Figure 6 shown, an annular groove 24 is provided at the upper part of the inner wall of the body 2, and the circulation hole 22 is provided at the lower part of the annular groove 24; A hole-closing sleeve 4 is arranged in the annular groove 24. When the hole-closing sleeve 4 is in the initial position and above the circulation hole 22, it will not block the circulation hole 22 (as Figure 6 shown); when the hole-closing sleeve 4 is in the hole-closing position, it blocks the circulation hole 22 (as Figure 7 shown).

[0056] In a preferred embodiment, when the hole-closing sleeve 4 is in the initial position, there is a certain distance between the upper end of the hole-closing sleeve 4 and the upper end of the annular groove 24, forming a pressure groove. By applying pressure in the pressure groove, the hole-closing sleeve 4 can be moved downward.

[0057] When the moving position of the grouting drill string makes the flow-through hole 62 communicate with the pressure groove, the pressure in the grouting drill string is applied in the pressure groove, thereby driving the hole-closing sleeve 4 to move from the initial position to the hole-closing position.

[0058] In one embodiment, as Figure 8 shown, a second anti-retreat snap ring 42 is provided on the hole-closing sleeve 4, and a second snap ring groove is provided in the annular groove 24. When the hole-closing sleeve 4 is in the hole-closing position, the second anti-retreat snap ring 42 is clamped in the second snap ring groove.

[0059] In this embodiment, the hole-closing sleeve 4 is connected to the body 2 through a second connecting member when in the initial position.

[0060] In one embodiment, the second connecting member is a hole-closing shear pin 41. Initially, the hole-closing sleeve 4 is connected to the body 2 by the hole-closing shear pin 41. When the pressure in the pressure groove reaches the set value, the hole-closing shear pin 41 breaks, and at this time, the hole-closing sleeve 4 can be driven to move downward until the hole-closing sleeve 4 moves to the position where the second anti-backoff snap ring 42 is clamped in the second snap ring groove. At this time, the hole-closing sleeve 4 blocks the circulation hole 22, thus completing the hole closing.

[0061] In another embodiment, the second connecting member is to provide another snap ring groove on the body 2, and the hole-closing sleeve 4 can also be clamped in this snap ring groove at the initial position, so as to achieve the effect of preventing premature hole closing in the same way.

[0062] During the process of using the process dimension non-drilling packer type staged cement injector according to this embodiment, before cementing, connect the large-size non-drilling packer type staged cement injector described in this embodiment in the casing and lower it to the designed depth. After the casing reaches the position, lower the grouting drill string into the casing and lower the grouting drill string to the float collar position of the casing to carry out primary cementing. At this time, in the large-size non-drilling packer type staged cement injector, the rubber cylinder 3 is in an unexpanded state. At this time, the upper joint 32 of the rubber cylinder blocks the circulation hole 22, and the circulation hole 22 is in a closed state. The hole-closing sleeve 4 is in the initial position.

[0063] During primary cementing, cement slurry is injected through the grouting drill string. The cement slurry enters the annulus between the casing and the wellbore from the lower end of the casing. After injecting the cement slurry, drilling fluid is used for displacement. Due to the small inner diameter of the drill string, the serious mixing of the cement slurry and the drilling fluid during displacement in the large-size casing is avoided; at the same time, the use of the sealing joint 6 realizes the sealing between the drill string and the casing, and no additional sealing plugs and sealing sockets are required.

[0064] When the drill string is lifted to the position of the large-size non-drilling packer type staged cement injector after primary cementing to make the flow-through hole 62 opposite to the liquid injection hole 23, at this time, as Figure 2 shown; a ball is dropped to build pressure. When the pressure reaches the set value, the inflation seal shear pin 31 is cut off under the action of the pressure, so that the rubber cylinder 3 can expand smoothly. When the first anti-backoff snap ring 33 is clamped in the first snap ring groove, the inflation seal packer is completed (as Figure 3 shown). At this time, the circulation hole 22 is opened, and in this way, the secondary cementing construction can be directly carried out.

[0065] During secondary cementing, move the grouting drill string to make the flow-through hole 62 opposite to the circulation hole 22 (as Figure 5 shown), and inject cement slurry through the grouting drill string. After injecting and displacing the cement slurry, use drilling fluid for displacement. Due to the small inner diameter of the drill string, the serious mixing of the cement slurry and the drilling fluid during displacement in the large-size casing is avoided.

[0066] After that, move the grouting drill string to make the flow-through hole 62 opposite to the pressure groove (as Figure 6As shown in the figure, pressure is applied to the drill string, and the pressure is applied in the pressure groove to cut off the closing hole shear pin 41, driving the closing hole sleeve 4 to move to the closing hole position. The second anti-backoff snap ring 42 is clamped in the second snap ring groove to block the circulation hole 22, completing the closing of the hole (as Figure 7 shown).

[0067] After the secondary cementing, pulling up the drill string can achieve full bore in the casing (as Figure 9 shown), avoiding problems such as difficulties in drilling out large-size casing plugs and plug seats.

[0068] According to another aspect of the present invention, a casing string is also proposed. The casing string sequentially includes from bottom to top: float shoe, large-size casing, float collar, large-size casing string, large-size drill-free packer-type stage cementing device, large-size casing string.

[0069] The following is illustrated by specific embodiments.

[0070] Embodiment 1 The large-size drill-free packer-type stage cementing device includes: A body 2, the body 2 has a cylindrical structure, an upper joint is provided at the upper end of the body 2, and a lower joint is provided at the lower end.

[0071] A rubber cylinder 3 provided on the body 2, the rubber cylinder 3 is provided outside the body 2, and an expandable space is formed between the rubber cylinder 3 and the body 2, and both ends of the rubber cylinder 3 are sealingly connected to the body 2.

[0072] A circulation hole 22 and an injection hole 23 are provided on the body 2, and the injection hole 23 communicates with the expandable space.

[0073] When the circulation hole 22 is opened, it is used to communicate with the external space of the body 2 for injecting cement into the annulus between the body 2 and the wellbore.

[0074] In the large-size drill-free packer-type stage cementing device according to this embodiment, it can cooperate with the grouting drill string to complete expansion and setting, and inject cement slurry through the circulation hole 22.

[0075] The large-size drill-free packer-type stage cementing device further includes a grouting drill string for cooperative use, and a sealing joint 6 is provided at the lower end of the grouting drill string.

[0076] An overflow hole 62 is provided on the side of the sealing joint 6. According to the depth of the grouting drill string, the position of the overflow hole 62 can be adjusted so that the overflow hole 62 is aligned with the injection hole 23, enabling fluid to be injected into the injection hole 23, so that the expandable space is filled with liquid, causing the rubber cylinder 3 to expand and seal between the body 2 and the wellbore, completing the setting.

[0077] By moving the position of the grouting drill tool, align the flow-through hole 62 with the circulation hole 22, inject cement slurry through the grouting drill tool, and complete the secondary cementing through the circulation hole 22.

[0078] A ball seat is arranged inside the sealing joint 6. Insert the pressure-holding ball 64, and the pressure-holding ball 64 falls into the ball seat, blocking the outlet at the lower end. The fluid will be discharged through the flow-through hole 62, so as to inject into the injection hole 23 to drive the expansion of the rubber cylinder 3 or inject into the circulation hole 22 for secondary cementing.

[0079] An upper seal 61 and a lower seal 63 are arranged on the outer wall of the sealing joint 6. The upper seal 61 and the lower seal 63 are configured to be able to seal the annulus between the sealing joint 6 and the inner wall of the body 2.

[0080] Moreover, the upper seal is arranged above the flow-through hole 62, and the lower seal 63 is arranged below the flow-through hole 62.

[0081] The upper seal 61 is an upper rubber bowl, and the lower seal 63 is a lower rubber bowl.

[0082] When the flow-through hole 62 is opposite to the injection hole 23, the upper rubber bowl seals the annulus above the flow-through hole 62 and the injection hole 23, and the lower rubber bowl seals the annulus below the flow-through hole 62 and the injection hole 23, ensuring that the fluid in the grouting drill tool can enter the injection hole 23 through the flow-through hole 62.

[0083] By the same principle, when the flow-through hole 62 is opposite to the circulation hole 22, the upper rubber bowl seals the annulus above the flow-through hole 62 and the circulation hole 22, and the lower rubber bowl seals the annulus below the flow-through hole 62 and the circulation hole 22, ensuring that the cement slurry in the grouting drill tool can enter the circulation hole 22 through the flow-through hole 62, so as to carry out the secondary cementing operation.

[0084] The lower end of the rubber cylinder 3 is fixedly and sealingly connected to the body 2 through a lower rubber cylinder joint 34, and the upper end of the rubber cylinder 3 is slidably connected to the body 2 through an upper rubber cylinder joint 32 and remains in a sealed state during the sliding process.

[0085] Initially, the upper rubber cylinder joint 32 is in the first position. When injecting fluid into the expandable space to expand the rubber cylinder 3, since the rubber cylinder 3 expands radially outwards, the upper rubber cylinder joint 32 will move downwards axially, thus moving from the first position to the second position.

[0086] The upper joint 32 of the rubber cylinder is an annular section sleeved on the body 2, which has a certain width to ensure that it can block the circulation hole 22 when in the first position. At this time, the circulation hole 22 is in a closed state. When the upper joint 32 of the rubber cylinder is in the second position, the upper joint 32 of the rubber cylinder moves away from the circulation hole 22 to open the circulation hole 22.

[0087] A first anti-retreat snap ring 33 is arranged on the upper joint 32 of the rubber cylinder, and a first snap ring groove is arranged on the outer wall of the body 2. When the upper joint 32 of the rubber cylinder is in the second position, the first anti-retreat snap ring 33 is clamped in the first snap ring groove.

[0088] In this embodiment, the upper joint 32 of the rubber cylinder is initially connected to the body 2 through a first connecting piece. The first connecting piece is an expansion seal shear pin 31, and the upper joint 32 of the rubber cylinder is connected to the body 2 through the expansion seal shear pin 31 to ensure that the rubber cylinder 3 will not be prematurely expanded and sealed.

[0089] After the first-stage cementing, the drill string is lifted to the position of the large-size drill-free packer type stage cementing device, so that the flow-through hole 62 is opposite to the liquid injection hole 23, and a ball is dropped and pressured. When the pressure reaches the set value, the expansion seal shear pin 31 is cut off under the action of the pressure, so that the rubber cylinder 3 can expand smoothly. After the first anti-retreat snap ring 33 is clamped in the first snap ring groove, the expansion and sealing packer is completed. In this way, the second-stage cementing construction can be directly carried out.

[0090] An annular groove 24 is arranged at the upper part of the inner wall of the body 2, and the circulation hole 22 is arranged at the lower part of the annular groove 24; A hole-closing sleeve 4 is arranged in the annular groove 24. When the hole-closing sleeve 4 is in the initial position and above the circulation hole 22, it will not block the circulation hole 22; when the hole-closing sleeve 4 is in the hole-closing position, it blocks the circulation hole 22.

[0091] When the hole-closing sleeve 4 is in the initial position, there is a certain distance between the upper end of the hole-closing sleeve 4 and the upper end of the annular groove 24, forming a pressure groove. By applying pressure in the pressure groove, the hole-closing sleeve 4 can be moved downward.

[0092] When the moving position of the grouting drill string makes the flow-through hole 62 communicate with the pressure groove, the pressure in the grouting drill string is applied in the pressure groove, so as to drive the hole-closing sleeve 4 to move from the initial position to the hole-closing position.

[0093] A second anti-retreat snap ring 42 is arranged on the hole-closing sleeve 4, and a second snap ring groove is arranged in the annular groove 24. When the hole-closing sleeve 4 is in the hole-closing position, the second anti-retreat snap ring 42 is clamped in the second snap ring groove.

[0094] When the hole-closing sleeve 4 is in the initial position, it is connected to the body 2 through the second connecting member.

[0095] The second connecting member is a hole-closing shear pin 41. Initially, the hole-closing sleeve 4 is connected to the body 2 through the hole-closing shear pin 41. When the pressure in the pressure groove reaches the set value, the hole-closing shear pin 41 breaks. At this time, the hole-closing sleeve 4 can be driven to move downward until the hole-closing sleeve 4 moves to the position where the second anti-retreat snap ring 42 is clamped in the second snap ring groove. At this time, the hole-closing sleeve 4 blocks the circulation hole 22, thus completing the hole closing.

[0096] Embodiment 2 A large-size drill-free packer type staged cement injector, comprising: A body 2, the body 2 is of a cylindrical structure, an upper joint is provided at the upper end of the body 2, and a lower joint is provided at the lower end.

[0097] A rubber cylinder 3 provided on the body 2, the rubber cylinder 3 is provided on the outside of the body 2, and an expandable space is formed between the rubber cylinder 3 and the body 2. Both ends of the rubber cylinder 3 are sealed and connected to the body 2.

[0098] A circulation hole 22 and an injection hole 23 are provided on the body 2, and the injection hole 23 communicates with the expandable space.

[0099] When the circulation hole 22 is opened, it is used to communicate with the external space of the body 2 for injecting cement into the annulus between the body 2 and the wellbore wall.

[0100] This embodiment is similar to the embodiment, the difference is that in this embodiment, the first connecting member can be another snap ring groove provided on the outside of the body 2. Initially, the first anti-retreat snap ring 33 can be clamped in the first snap ring groove. The second connecting member is to provide another snap ring groove on the body 2, and the hole-closing sleeve 4 can also be clamped in this snap ring groove in the initial position to achieve the effect of preventing premature hole closing in the same way.

[0101] Embodiment 3 A large-size drill-free packer type staged cement injector, comprising: A body 2, the body 2 is of a cylindrical structure, an upper joint is provided at the upper end of the body 2, and a lower joint is provided at the lower end.

[0102] A rubber cylinder 3 provided on the body 2, the rubber cylinder 3 is provided on the outside of the body 2, and an expandable space is formed between the rubber cylinder 3 and the body 2. Both ends of the rubber cylinder 3 are sealed and connected to the body 2.

[0103] A circulation hole 22 and an injection hole 23 are provided on the body 2, and the injection hole 23 communicates with the expandable space.

[0104] When the circulation hole 22 is opened, it is used to communicate with the external space of the main body 2 and inject cement into the annulus between the main body 2 and the wellbore wall.

[0105] This embodiment is similar to the embodiment, the difference is that in this embodiment, a stepped structure is provided in the annular groove 24, and a stepped structure is also provided on the outer side of the hole-closing sleeve 4. When the hole-closing sleeve 4 moves from the initial position to the hole-closing position, the stepped structure of the annular groove 24 cooperates with the stepped structure of the hole-closing sleeve 4 to play a role in limiting.

[0106] An annular cavity is formed between the two stepped structures. A breathing hole 21 is provided on the main body 2. By providing the breathing hole 21, it is avoided that the compression of the small cavity when the hole-closing sleeve 4 descends affects the operation.

[0107] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0108] In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0109] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0110] Certain terms are used throughout this application to refer to particular system components. As those skilled in the art will recognize, the same components may typically be referred to by different names, and thus this application is not intended to distinguish between components that differ only in name and not in function. The phrase "an embodiment" or "embodiments" as used in the specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the phrase "an embodiment" or "embodiments" that appears throughout the specification is not necessarily all referring to the same embodiment.

[0111] Embodiments of the present invention are provided for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

[0112] Although the preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and / or modifications that fall within the scope of the present invention. All changes and / or modifications made in accordance with the embodiments of the present invention should be covered within the protection scope of the present invention.

Claims

1. A large-size drilling-free packer-type graded cementing device, characterized in that: include: A main body (2), wherein a circulation hole (22) and a liquid injection hole (23) are provided on the main body (2); as well as A rubber cylinder (3) is arranged outside the body (2), an expandable space is formed between the rubber cylinder (3) and the body (2), and both ends of the rubber cylinder (3) are sealed and connected to the body (2); The injection hole (23) is connected to the expandable space; and the circulation hole (22) is used to connect to the external space of the body (2) when opened, and is used to inject cement into the annulus between the body (2) and the well wall.

2. The large-size drilling-free isolation type staged cementing device according to claim 1 is characterized in that: It also comprises a grouting drill, the lower end of which is provided with a sealing joint (6).

3. The large-size drilling-free isolation type staged cementing device according to claim 2 is characterized in that: A ball seat is provided inside the sealing joint (6), and a flow hole (62) is provided on a side of the sealing joint (6), wherein the flow hole (62) is arranged above the ball seat; The flow hole (62) is selectively connected to the circulation hole (22) or the injection hole (23) by moving the position of the grouting drill.

4. The large-size drilling-free packer-type staged cementing device according to claim 3 is characterized in that: An upper sealing member (61) and a lower sealing member (63) are provided on the outer wall of the sealing joint (6), and the upper sealing member (61) and the lower sealing member (63) are configured to seal the annular space between the sealing joint (6) and the inner wall of the body (2); Furthermore, the upper sealing member (61) is arranged above the flow hole (62), and the lower sealing member (63) is arranged below the flow hole (62).

5. The large-size drilling-free packer-type staged cementing device according to claim 4 is characterized in that: The lower end of the rubber cylinder (3) is fixedly and hermetically connected to the body (2) via a rubber cylinder lower joint (34), and the upper end of the rubber cylinder (3) is slidably and hermetically connected to the body (2) via a rubber cylinder upper joint (32); Initially, the upper joint (32) of the rubber cartridge is in a first position, and when fluid is injected into the expandable space to expand the rubber cartridge (3), the upper joint (32) of the rubber cartridge moves downward to a second position.

6. The large-size drilling-free packer-type staged cementing device according to claim 5 is characterized in that: When the upper joint (32) of the rubber cylinder is in the first position, the upper joint (32) of the rubber cylinder blocks the circulation hole (22), and the circulation hole (22) is in a closed state; When the rubber cylinder upper joint (32) is in the second position, the rubber cylinder upper joint (32) is moved away from the circulation hole (22), so that the circulation hole (22) is opened.

7. The large-size drilling-free packer-type staged cementing device according to claim 6 is characterized in that: A first anti-retraction retaining spring (33) is provided on the upper joint (32) of the rubber cylinder, and a first retaining spring groove is provided on the outer wall of the body (2); when the upper joint (32) of the rubber cylinder is in the second position, the first anti-retraction retaining spring (33) is retained in the first retaining spring groove.

8. The large-size drill-free packer staged cementing device according to any one of claims 4 to 7, characterized in that: An annular groove (24) is provided at the upper portion of the inner wall of the body (2), and the circulation hole (22) is provided at the lower portion of the annular groove (24); A hole sleeve (4) is arranged in the annular groove (24); when the hole-closing sleeve (4) is in the initial position, the hole-closing sleeve (4) is located above the circulation hole (22); when the hole-closing sleeve (4) is in the hole-closing position, it blocks the circulation hole (22).

9. The large-size drilling-free packer-type staged cementing device according to claim 8, characterized in that: When the hole-closing sleeve (4) is in the initial position, the upper end of the hole-closing sleeve (4) is at a certain distance from the upper end of the annular groove (24), forming a pressure groove; when the movement position of the grouting drill makes the flow hole (62) communicate with the pressure groove, the pressure in the grouting drill is applied to the pressure groove, thereby driving the hole-closing sleeve (4) to move from the initial position to the hole-closing position.

10. The large-size drilling-free packer-type staged cementing device according to claim 9, characterized in that: The hole-closing sleeve (4) is provided with a second anti-retraction retaining spring (42), and a second retaining spring groove is provided in the annular groove (24); when the hole-closing sleeve (4) is in the hole-closing position, the second anti-retraction retaining spring (42) is retained in the second retaining spring groove.

11. The large-size drilling-free packer-type staged cementing device according to claim 10, characterized in that: Initially, the upper joint (32) of the rubber cylinder is connected to the body (2) via a first connecting piece, and the hole-closing sleeve (4) is connected to the body (2) via a second connecting piece.

12. A pipe string sleeve, characterized in that: include: A large-sized casing string, wherein the large-sized drilling-free packer-type staged cementing device according to any one of claims 1 to 11 is arranged in the large-sized casing string; A float collar and a float shoe are arranged at the lower end of the large-size casing string.

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