Drilling-plug-free graded cementing device for well cementation

Abstract

The invention relates to the technical field of grading hoops, in particular to a drilling-plug-free grading cementing device for well cementation. Comprising an outer shell, an inner thread part and an outer thread part which are used for being connected with a sleeve are arranged on the upper portion and the lower portion in the outer shell respectively, a plurality of fixed grouting holes are formed in the outer shell, and a plugging mechanism used for controlling opening and closing of the fixed grouting holes and a detachable power mechanism are arranged in the outer shell; the plugging mechanism comprises an adjusting ring and a spline ring, the adjusting ring is connected with the outer shell in a sealed and rotating mode, and the adjusting ring is provided with movable grouting holes with the number equal to that of the fixed grouting holes. Opening and closing of the grouting holes are controlled through rotation of the adjusting ring, compared with the mode that opening and closing of the grouting holes are controlled through axial sliding in a traditional grading hoop, the axial sliding stroke space does not need to be arranged, the length of the outer shell is shortened, and the adaptability of the whole casing pipe to the complex stratum environment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of graded collars, in particular to a drill-free graded cementing device for cementing. Background Art

[0002] As a key cementing tool in oil and gas drilling projects, graded collars are mainly used to solve the technical difficulties of cementing operations in long well sections: when the bearing capacity of the formation is insufficient or there is a leakage layer, the traditional cementing process is prone to cause cement slurry leakage or formation rupture; graded cementing technology achieves precise control of annular pressure through segmented grouting, among which the graded collar is the core control device, which adopts a pressure-holding ball activation mechanism to control the opening and closing of the corresponding grouting holes through pressure-holding balls of different diameters. Modern products are mainly divided into two categories: conventional graded collars that require later drilling out of internal components and drill-free graded collars made of soluble materials.

[0003] The existing pressure-holding ball control scheme requires setting up multi-stage reduced diameter sections inside the grading collar, and driving the sliding sleeve to slide axially through the pressure-holding ball to change the state of the grouting hole. Since this method requires sufficient axial stroke to be reserved, the overall length of the grading collar is long, so it is mostly used for deep well high-pressure cementing. However, this method has poor adaptability to narrow spaces underground and poor effect in complex formation operations. Summary of the invention

[0004] The invention provides a drilling-free plug-type graded cementing device for cementing, so as to overcome the disadvantage that the existing graded collar has poor adaptability to the narrow space underground.

[0005] Technical solution: A drilling-free plug-free graded cementing device for cementing, comprising: An outer shell, wherein the upper and lower parts of the outer shell are respectively provided with an internal threaded part and an external threaded part for connecting the casing, the outer shell is provided with a plurality of fixed grouting holes, and the outer shell is provided with a blocking mechanism and a detachable power mechanism for controlling the opening and closing of the fixed grouting holes; The sealing mechanism includes: an adjusting ring and a spline ring, the adjusting ring is sealingly and rotatably connected to the outer shell, the adjusting ring is provided with dynamic grouting holes whose number is equal to the fixed grouting holes, all the dynamic grouting holes are staggered with all the fixed grouting holes, the inner diameter of the adjusting ring, the inner diameter of the spline ring and the minimum inner diameter of the outer shell are all equal, the spline ring is spline-connected to the outer shell, and the spline ring contacts the adjusting ring and is located between the adjusting ring and the internal threaded portion.

[0006] Furthermore, the power mechanism comprises: An inner sliding shell, an adjusting member, a power ring and a limit block, the inner sliding shell is slidingly connected to the outer shell, the inner sliding shell is rotatably connected to the adjusting member, a power slide groove is arranged on the inner side of the adjusting member, the power ring is slidably and rotatably connected to the adjusting member, and the power ring slides in the power slide groove, a first spring is fixedly connected between the power ring and the inner sliding shell, the position of the adjusting member close to the adjusting ring is rotatably connected to the limit block, a torsion spring is fixedly connected between the limit block and the adjusting member, a limit groove connected to the adjacent dynamic grouting hole is arranged on the inner side of the adjusting ring, the limit groove limits the limit block, and a dismantling mechanism is arranged on the inner sliding shell.

[0007] Furthermore, the removal mechanism comprises: Multiple connecting blocks, support rings, multiple limit blocks and extrusion parts, the inner sliding shell and the support ring are fixedly connected to the connecting block, the support ring is slidably connected to the spline ring, the limit block is slidably connected to the support ring, the inner side of the spline ring is provided with support grooves equal to the number of the limit blocks, the support grooves limit the adjacent limit blocks, the lower side surfaces of the support grooves and the side surfaces of the adjacent limit blocks in contact with them are both inclined surfaces, and the height of the above-mentioned inclined surfaces gradually decreases in the direction from the outside to the inside, the support ring is slidably connected to the extrusion part, and a tension spring is fixed between the above-mentioned two, and the extrusion part abuts against the limit block.

[0008] Furthermore, the power ring is provided with an annular guide surface, the connecting block is provided with a guiding bevel on one side close to the central axis of the outer shell, the support ring is provided with a first annular surface, and the extrusion piece is provided with a second annular surface. The heights of the annular guide surface, the guiding bevel, the first annular surface and the second annular surface gradually decrease from the outside to the inside. In the direction of the central axis of the outer shell, the maximum distance between the second annular surface and the limit block is equal to the minimum distance between the extrusion piece and the guiding bevel, and the connecting block is located on the moving path of the extrusion piece.

[0009] Furthermore, the minimum inner diameter of the extrusion piece is greater than the inner diameter of the power ring, and the minimum diameter of the circle surrounded by all the guiding inclined surfaces is equal to the minimum inner diameter of the extrusion piece.

[0010] Furthermore, a wedge-shaped groove is provided on the lower side of the limit block, and the second annular surface limits the limit block through the wedge-shaped groove to keep the limit block disengaged from the adjacent support groove.

[0011] Furthermore, a locking column is slidably connected in the outer shell, and a second spring is fixedly connected between the two, a locking groove is provided in the adjusting ring, the locking groove is connected with the limiting groove, the locking column and the outer shell are both in contact with the limiting block, and the limiting block is used to make the upper side surface of the locking column coplanar with the lower side surface of the adjusting ring.

[0012] Furthermore, the elastic coefficient of the second spring on the locking column is smaller than the elastic coefficient of the torsion spring on the limiting shift block.

[0013] Furthermore, all the connecting blocks are commonly fixed with a mounting ring, the mounting ring is sealingly and rotatably connected to the adjusting member, and an accordion cover is commonly fixed between the mounting ring and the power ring, and the accordion cover is used to shield the power slide groove.

[0014] Furthermore, the power ring is fixedly connected with a shielding cylinder spline-connected to the inner sliding shell, and the shielding cylinder is used to shield the first spring between the power ring and the inner sliding shell.

[0015] To summarize, the present application includes at least one of the following beneficial technical effects: the present invention utilizes the rotation of the adjusting ring to control the opening and closing of the grouting holes. Compared with the traditional method of controlling the opening and closing of the grouting holes by axial sliding inside the grading collar, there is no need to set an axial sliding travel space, which shortens the length of the outer shell and improves the overall adaptability of the casing to complex formation environments.

[0016] The extrusion piece is used to control the connection state of the limit block and the spline ring, so as to achieve the purpose of removing the power mechanism and the removal mechanism from the casing after the grouting is completed, eliminate the reduced diameter section inside the grading collar, and then reduce the influence of the grading collar on the inner diameter of the casing. On the one hand, the probability of downhole tools getting stuck in the reduced diameter section is reduced, and the probability of the grouting hole being opened by mistake due to the axial movement of the downhole tools is reduced, thereby enhancing the reliability of the grouting hole sealing. On the other hand, the elimination of the reduced diameter section makes the inside of the casing smoother, reduces the fluid resistance in the casing, and helps to improve production efficiency.

[0017] The accordion sleeve is used to shield the power slide to prevent cement slurry from entering the power slide and affecting the normal movement of the adjustment part and the power ring. The shielding tube is used to shield the first spring of the inner slide shell to prevent cement slurry from adhering to the first spring and affecting the normal movement and reset of the power ring, thereby improving the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the adjustment ring and the spline ring of the present invention; Figure 3It is a schematic diagram of the three-dimensional structure of the adjusting member and the supporting ring of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the power ring and the connecting block of the present invention; Figure 5 An exploded view of the adjusting member and the supporting ring of the present invention; Figure 6 The present invention is attached Figure 4 The enlarged view of point A in the middle; Figure 7 The present invention is attached Figure 4 Enlarged view of point B in the middle.

[0019] The names and serial numbers of the parts in the figure are: 1-outer shell, 101-inner threaded portion, 102-external threaded portion, 103-fixed grouting hole, 2-adjusting ring, 201-dynamic grouting hole, 3-spline ring, 4-inner sliding shell, 5-adjusting member, 501-power slide groove, 6-power ring, 601-annular guide surface, 7-limiting block, 701-limiting groove, 8-connecting block, 801-guide slope, 9-support ring, 901-first ring surface, 10-limiting block, 1001-support groove, 11-extrusion member, 111-second ring surface, 112-wedge-shaped groove, 12-locking column, 121-locking groove, 13-mounting ring, 14-accordion sleeve, 15-shielding cylinder. DETAILED DESCRIPTION

[0020] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. Example 1

[0021] This embodiment discloses a drill-free plug-free graded cementing device for cementing, which is used to enhance the adaptability of the graded collar to the narrow space underground.

[0022] The existing pressure-holding ball control scheme requires setting up multi-stage reduction sections inside the grading collar, and driving the sliding sleeve to change the state of the grouting hole through the pressure-holding ball. However, both conventional grading collars and drill-free grading collars will form a permanent reduction structure in the casing. At the same time, since the internal parts of the existing grading collar slide along its axis to open and close the grouting hole, subsequent operations face double risks: on the one hand, the downhole tool is prone to jamming in the reduction section; on the other hand, mechanical collisions can easily cause internal parts to be triggered by mistake, resulting in the grouting hole being opened by mistake; if the grouting hole is accidentally opened, the annular fluid will flow back into the casing, causing cement slurry to flow back to pollute the wellbore and block the production channel. In severe cases, it will lead to cement ring seal failure and interlayer crossflow, affecting the production capacity of the oil and gas well.

[0023] See also Figure 1-Figure 3A drill-free plug-free graded cementing device for cementing comprises an outer shell 1, wherein the upper and lower parts of the outer shell 1 are respectively provided with an inner threaded part 101 and an outer threaded part 102 for connecting a casing or other downhole tools, the middle part of the outer shell 1 is provided with five fixed grouting holes 103 equidistantly distributed in the circumferential direction, and a plugging mechanism and a detachable power mechanism for controlling the opening and closing of the fixed grouting holes 103 are provided in the outer shell 1.

[0024] See also Figure 2 and Figure 3 The plugging mechanism includes: an adjusting ring 2 and a spline ring 3, the adjusting ring 2 is located inside the outer shell 1 and is sealed and rotatably connected thereto, the middle part of the adjusting ring 2 is provided with five dynamic grouting holes 201 equidistantly distributed in the circumferential direction, the five dynamic grouting holes 201 are staggered with the five fixed grouting holes 103, when the dynamic grouting holes 201 correspond to the adjacent fixed grouting holes 103, the inner and outer sides of the outer shell 1 are connected, at this time, the cement slurry inside the outer shell 1 flows into the outer side thereof through the dynamic grouting holes 201 and the adjacent fixed grouting holes 103; the spline ring 3 is located at the upper part inside the outer shell 1 and is spline-connected thereto, the spline ring 3 contacts the adjusting ring 2 and is located between the adjusting ring 2 and the internal threaded portion 101, in actual use, the casing or downhole tool threadedly connected to the internal threaded portion 101 is used to abut the spline ring 3 to maintain the relative position of the spline ring 3 and the outer shell 1, the inner diameter of the adjusting ring 2, the inner diameter of the spline ring 3 and the minimum inner diameter of the outer shell 1 are all equal.

[0025] The above arrangement can realize the control of the opening and closing of the grouting holes by the rotation of the adjusting ring 2. Compared with the method of controlling the opening and closing of the grouting holes by axial sliding inside the traditional grading collar, there is no need to set a stroke space for axial sliding, which shortens the length of the outer shell 1 and improves the adaptability of the casing as a whole to complex formation environments. By limiting the relationship between the inner diameter of the adjusting ring 2, the inner diameter of the spline ring 3 and the minimum inner diameter of the outer shell 1, the inner side surfaces of the outer shell 1 and the casing as a whole are made smoother, thereby reducing fluid resistance.

[0026] See also Figure 2-Figure 6The power mechanism includes: an inner sliding shell 4, an adjusting member 5, a power ring 6 and a limit shifting block 7. The inner sliding shell 4 is sealed and slidably connected to the outer shell 1. The inner sliding shell 4 is composed of a cylinder and a ring connected to each other. The inner sliding shell 4 is rotatably connected to the adjusting member 5. The inner side of the adjusting member 5 is provided with two power sliding grooves 501 distributed symmetrically in the center. The power ring 6 can only slide up and down relative to the inner sliding shell 4. The power ring 6 is sealed, slidably and rotatably connected to the adjusting member 5. The upper part of the outer side of the power ring 6 is provided with two semi-symmetrically distributed semi-rotatable grooves 501. The first spring is fixedly connected between the lower side of the power ring 6 and the circular ring of the inner sliding shell 4. The inner diameter of the power ring 6 is determined according to the inner diameter of the casing and the number of required grouting points. The upper part of the adjusting member 5 is rotatably connected with the limit shift block 7. Initially, the lower side of the limit shift block 7 is fitted with the outer shell 1. The limit shift block 7 and the adjusting member 5 are fixedly connected with an initial force storage torsion spring, so that the limit shift block 7 always has a counterclockwise rotation (in this article, the limit shift block 7 is fixedly connected with the inner sliding shell 4). Figure 3 The inner side of the adjusting ring 2 is provided with a limiting groove 701 connected to the adjacent dynamic grouting hole 201, the limiting groove 701 limits the limiting shift block 7, and the inner sliding shell 4 is provided with a removal mechanism.

[0027] The above arrangement can be realized by relying on the contact between the pressure-holding ball and the power ring 6 to isolate the outer shell 1 into two parts, the upper and lower parts. In this way, when pressure is applied to the upper part of the outer shell 1, the adjusting ring 2 can be driven to rotate through the adjusting member 5 and the limit shift block 7, thereby achieving the purpose of controlling the dynamic grouting hole 201 to be connected with the adjacent fixed grouting hole 103. After the grouting is completed, the elastic force of the first spring in the inner sliding shell 4 is used to make the adjusting ring 2 rotate in the opposite direction, thereby achieving the purpose of controlling the misalignment of the dynamic grouting hole 201 and the adjacent fixed grouting hole 103.

[0028] See also Figure 2-Figure 7 The dismantling mechanism includes: four connecting blocks 8, a support ring 9, six limit blocks 10 and an extrusion piece 11. The inner sliding shell 4 and the support ring 9 are fixedly connected to all the connecting blocks 8. The spline ring 3 and the six limit blocks 10 are slidably connected to the support ring 9. Six supporting grooves 1001 are arranged on the inner side of the spline ring 3. The six limit blocks 10 and the six supporting grooves 1001 are equidistantly distributed in the circumferential direction. The two sides of the limit block 10 are respectively located in the support ring 9 and the adjacent support groove 1001. The spline ring 3 limits the support ring 9 by the limit block 10. The lower side surface of the support groove 1001 and the side surface of the adjacent limit block 10 in contact with it are all inclined surfaces, and the height of the above-mentioned inclined surface gradually decreases in the direction from the outside to the inside. The support ring 9 is slidably connected to the extrusion piece 11, and a tension spring is fixed between the above-mentioned two. The extrusion piece 11 abuts against the limit block 10. The extrusion piece 11 is made of ferromagnetic material, and low alloy steel is selected here.

[0029] The above arrangement can realize the purpose of controlling the connection state of the limit block 10 and the spline ring 3 by using the extrusion piece 11, and realizing the purpose of removing the power mechanism and the removal mechanism from the casing after the grouting is completed, eliminating the reduced diameter section inside the grading collar, and then reducing the influence of the grading collar on the inner diameter of the casing. On the one hand, the probability of the downhole tool getting stuck in the reduced diameter section is reduced, and the probability of the downhole tool moving axially and causing the grouting hole to be opened by mistake is reduced, thereby enhancing the reliability of the grouting hole sealing. On the other hand, the elimination of the reduced diameter section makes the inside of the casing smoother, reduces the fluid resistance in the casing, and helps to improve production efficiency.

[0030] See also Figure 4 , Figure 5 and Figure 7 , an annular guide surface 601 is provided on the upper side of the power ring 6, a guiding inclined surface 801 is provided on the side of the connecting block 8 close to the central axis of the outer shell 1, a first annular surface 901 is provided on the upper side of the support ring 9, and a second annular surface 111 connected to the first annular surface 901 is provided on the upper side of the extrusion piece 11. The heights of the annular guide surface 601, the guiding inclined surface 801, the first annular surface 901 and the second annular surface 111 gradually decrease from the outside to the inside; in the direction of the central axis of the outer shell 1, the second annular surface 111 and the The maximum distance between the limit blocks 10 is equal to the minimum distance between the extrusion 11 and the guide bevel 801. The connecting block 8 is located on the moving path of the extrusion 11. The lower part of the extrusion 11 is provided with a groove matching the upper part of the connecting block 8, so that the extrusion 11 can slide along the upper part of the connecting block 8 and can contact the upper edge of the guide bevel 801; the minimum inner diameter of the extrusion 11 is larger than the inner diameter of the power ring 6, and the minimum diameter of the circle surrounded by all the guide bevels 801 is equal to the minimum inner diameter of the extrusion 11.

[0031] The above arrangement can be realized, by utilizing the guidance of the annular guide surface 601, the guide bevel 801, the first annular surface 901 and the second annular surface 111, so that when the device is used in the inclined well section, it can guide the pressure-holding ball to move smoothly to the corresponding power ring 6 to achieve sealing; the arrangement of the extrusion piece 11 and the guide bevel 801 does not affect the normal movement of the pressure-holding ball.

[0032] During the cementing process, the number of required grading hoops is determined according to the wellbore depth and the pressure bearing capacity of the formation (this article takes three-stage grouting, three-level cementing construction, and two grading hoops as an example for explanation), and then the specifications of the grading hoops are selected according to the inner diameter of the casing. Then, the two outer shells 1 are connected to the corresponding positions of the casing in sequence through threads, and the inner diameters of the two power rings 6 are increased in steps from bottom to top. Then, the casing is lowered into the wellbore, and the drilling fluid is circulated in the wellbore to start the first-level cementing construction.

[0033] First-level cementing construction: Inject pre-fluid into the casing to remove drilling fluid residue and isolate drilling fluid from cement slurry; Inject a certain amount of cement slurry and drilling fluid in sequence, so that all the cement slurry flows out from the bottom of the casing and fills the lower third of the wellbore; Wait for the cement to initially set and confirm the quality of the first-level cementing; A pressure-holding ball (the pressure-holding ball is made of soluble material) with a diameter larger than the inner diameter of the lower power ring 6 and smaller than the inner diameter of the upper power ring 6 is thrown into the casing. The pressure-holding ball is stuck on the lower power ring 6 to achieve sealing. The lower power ring 6 and the pressure-holding ball are used to separate the casing into two parts, upper and lower parts.

[0034] Secondary cementing construction: injection of pre-fluid; A certain amount of cement slurry and drilling fluid are injected in sequence, so that the pressure on the upper part of the casing gradually increases, and the lower pressure holding ball and the power ring 6 are squeezed to move downward, and the first spring of the power ring 6 is compressed. In this process, the power ring 6 slides along the power slide groove 501 and drives the adjusting member 5 to rotate circumferentially. The adjusting member 5 drives the adjusting ring 2 to rotate through the limit block 7 thereon, so that the dynamic grouting hole 201 corresponds to and communicates with the adjacent fixed grouting hole 103. At this time, all the cement in the casing flows out through the dynamic grouting hole 201 and the adjacent fixed grouting hole 103 to fill two-thirds of the wellbore; Wait for the cement to initially set and confirm the quality of secondary cementing; While waiting for the initial setting of cement, the pressure-holding ball dissolves, so that the upper and lower sides of the lower power ring 6 are reconnected. At this time, the power ring 6 moves up and resets under the action of the first spring, and the above steps are repeated in the reverse direction. The adjusting member 5 drives the adjusting ring 2 to rotate in the reverse direction through the limit shifting block 7, so that the dynamic grouting hole 201 is misaligned with the adjacent fixed grouting hole 103; A pressure-holding ball with a diameter larger than the inner diameter of the upper power ring 6 is thrown into the casing, and the pressure-holding ball is stuck on the upper power ring 6 to achieve sealing, and the casing is separated by the upper power ring 6 and the pressure-holding ball.

[0035] Third-level cementing construction: Repeat the above steps for the second-level cementing construction.

[0036] After the cementing construction is completed, the steps for removing the power mechanism are as follows: select a strong magnetic salvage device with an outer diameter larger than the minimum inner diameter of the extrusion piece 11 and smaller than its maximum inner diameter to penetrate into the casing, so that the strong magnetic salvage device penetrates into the specified depth (that is, the depth of the upper extrusion piece 11 relative to the casing port), the strong magnetic salvage device contacts the upper extrusion piece 11 and pushes it downward, stretching the tension spring of the extrusion piece 11, and when the extrusion piece 11 contacts the adjacent guiding inclined surface 801, the extrusion piece 11 loses contact with the six limit blocks 10, the extrusion piece 11 squeezes the connecting block 8 to move, and the connecting block 8 drives the inner sliding shell 4 and the support ring 9 to move together.

[0037] During the downward movement of the inner sliding shell 4 , the inner sliding shell 4 drives the adjusting member 5 , the power ring 6 and the limit shifting block 7 to move downward together, and the limit shifting block 7 swings clockwise around its rotation axis and twists the torsion spring of the limit shifting block 7 .

[0038] During the downward movement of the support ring 9, the support ring 9 drives the six limit blocks 10 to move downward together. The limit blocks 10 are squeezed by the lower inclined surface of the adjacent support groove 1001 and move toward the direction close to the central axis of the support ring 9. Finally, the six limit blocks 10 completely lose contact with the adjacent support grooves 1001. At this time, the six limit blocks 10 are all located on the upward moving path of the extrusion piece 11. The worker controls the strong magnetic salvage device to move upward along the casing, and the strong magnetic salvage device drives the extrusion piece 11 to move upward through magnetic attraction.

[0039] When the strong magnetic salvage device drives the extrusion piece 11 to move upward, the extrusion piece 11 drives the support ring 9, the connecting block 8, the inner sliding shell 4, the adjusting piece 5, the power ring 6 and the limit shift block 7 to move upward together through the six limit blocks 10, wherein the limit shift block 7 swings counterclockwise under the action of the torsion spring and loses contact with the limit groove 701, and finally the original lower side surface of the limit shift block 7 fits with the adjusting piece 5, and then the strong magnetic salvage device drives the power mechanism and the removal mechanism to move all out of the outer shell 1 to realize the removal operation, so that the inner diameter of the casing is consistent with the inner diameter of the outer shell 1, eliminating the influence of the reduced diameter section on the downhole tool and the fluid in the casing; the steps for removing the lower power mechanism are the same as above. Example 2

[0040] This embodiment discloses a drill-free plug-free staged cementing device for cementing, which is further optimized on the basis of the first embodiment.

[0041] See also Figure 7 A wedge-shaped groove 112 is provided on the lower side of the limiting block 10 . The shape of the wedge-shaped groove 112 corresponds to the shape of the second annular surface 111 . The second annular surface 111 limits the limiting block 10 through the wedge-shaped groove 112 .

[0042] The above arrangement can achieve that, during the process of dismantling the power mechanism, the second annular surface 111 is used to limit the limit block 10 to prevent the limit block 10 from protruding out of the support ring 9 and affecting the dismantling operation.

[0043] When the strong magnetic salvage device drives the extrusion piece 11 to move upward, the extrusion piece 11 first slides upward relative to the support ring 9 under the action of the tension spring, so that the second annular surface 111 contacts the six wedge-shaped grooves 112 and limits the six limit blocks 10, and then the extrusion piece 11 drives the support ring 9 to move upward through the limit blocks 10. Example 3

[0044] This embodiment discloses a drill-free plug-free graded cementing device for cementing. On the basis of the embodiment 1, the reliability of the adjustment ring 2 in sealing the grouting hole is enhanced.

[0045] See also Figure 3 , Figure 4 and Figure 6 A locking column 12 is slidably connected in the outer shell 1. Initially, the locking column 12 is in contact with the limit block 7 and is completely located in the outer shell 1, so that a second spring with initial compression and force storage is fixedly connected between the two. A locking groove 121 connected to the limit groove 701 is provided in the adjusting ring 2. The width of the locking groove 121 is smaller than the width of the locking column 12, so that half of the locking column 12 is located in the limit groove 701, and the locking column 12 and the outer shell 1 are both in contact with the limit block 7; the elastic coefficient of the second spring on the locking column 12 is smaller than the elastic coefficient of the torsion spring on the limit block 7.

[0046] The above arrangement can be achieved, that is, initially, the contact between the limit shift block 7 and the limit groove 701 is maintained by utilizing the contact between the limit shift block 7 and the outer shell 1 and the locking column 12, while maintaining the upper side of the locking column 12 and the lower side of the adjusting ring 2 in the same plane, so that the adjusting ring 2 can rotate circumferentially; after the cementing construction is completed and the power mechanism is removed, the limit shift block 7 loses the squeeze on the locking column 12, so that the locking column 12 extends into the locking groove 121 and the limit groove 701 under the action of the second spring, limiting the adjusting ring 2, preventing the adjusting ring 2 from rotating circumferentially, and further reducing the probability of the grouting hole being opened by mistake. Example 4

[0047] This embodiment discloses a drill-free plug-free staged cementing device for cementing, which enhances the reliability of the power mechanism during operation on the basis of the first embodiment.

[0048] See also Figure 4-Figure 6 A mounting ring 13 is commonly fixed to the lower side of all the connecting blocks 8, and the mounting ring 13 is sealingly and rotatably connected to the adjusting member 5. An accordion sleeve 14 is commonly fixed between the lower side of the mounting ring 13 and the power ring 6; a shielding tube 15 spline-connected to the inner sliding shell 4 is fixed to the lower side of the power ring 6.

[0049] The above setting can be realized by using the accordion cover 14 to block the power slide 501 to prevent cement slurry from entering the power slide 501 and affecting the normal movement state of the adjusting part 5 and the power ring 6, and using the blocking tube 15 to block the first spring of the inner slide shell 4 to prevent cement slurry from adhering to the first spring and affecting the normal movement and reset of the power ring 6, thereby improving the reliability of the device.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A drilling-free plug-in graded cementing device for cementing, comprising: An outer shell (1), wherein the upper and lower parts of the outer shell (1) are respectively provided with an internal threaded part (101) and an external threaded part (102) for connecting a casing, and the outer shell (1) is provided with a plurality of fixed grouting holes (103), characterized in that a blocking mechanism and a detachable power mechanism for controlling the opening and closing of the fixed grouting holes (103) are provided in the outer shell (1); The plugging mechanism comprises: an adjusting ring (2) and a spline ring (3); the adjusting ring (2) is sealingly rotatably connected to the outer shell (1); the adjusting ring (2) is provided with dynamic grouting holes (201) whose number is equal to the fixed grouting holes (103); all the dynamic grouting holes (201) and all the fixed grouting holes (103) are staggered; the inner diameter of the adjusting ring (2), the inner diameter of the spline ring (3) and the minimum inner diameter of the outer shell (1) are all equal; the spline ring (3) is spline-connected to the outer shell (1); the spline ring (3) contacts the adjusting ring (2) and is located between the adjusting ring (2) and the internal threaded portion (101).

2. A drilling-free plug-in graded cementing device for cementing according to claim 1, characterized in that: The power mechanism comprises: An inner sliding shell (4), an adjusting member (5), a power ring (6) and a limit shifting block (7), wherein the inner sliding shell (4) is slidably connected to the outer shell (1), the inner sliding shell (4) is rotatably connected to the adjusting member (5), a power sliding groove (501) is provided on the inner side of the adjusting member (5), the power ring (6) is slidably and rotatably connected to the adjusting member (5), and the power ring (6) slides in the power sliding groove (501), and the power ring (6) is rotatably connected to the adjusting member (5). A first spring is fixedly connected between the inner sliding shell (4); the adjusting member (5) is rotatably connected to the limit block (7) at a position close to the adjusting ring (2); a torsion spring is fixedly connected between the limit block (7) and the adjusting member (5); a limit groove (701) connected to the adjacent dynamic grouting hole (201) is provided on the inner side of the adjusting ring (2); the limit groove (701) limits the limit block (7); and a removal mechanism is provided on the inner sliding shell (4).

3. A drilling-free plug-in graded cementing device for cementing according to claim 2, characterized in that: The removal mechanism comprises: A plurality of connection blocks (8), a support ring (9), a plurality of limit blocks (10) and an extrusion piece (11), wherein the inner sliding shell (4) and the support ring (9) are both fixedly connected to the connection block (8), the support ring (9) is slidably connected to the spline ring (3), the limit block (10) is slidably connected to the support ring (9), the inner side of the spline ring (3) is provided with support grooves (1001) equal in number to the limit blocks (10), the support grooves (1001) limit adjacent limit blocks (10), the lower side surface of the support groove (1001) and the side surface of the adjacent limit block (10) in contact therewith are both inclined surfaces, and the height of the inclined surface gradually decreases in the direction from the outside to the inside, the support ring (9) is slidably connected to the extrusion piece (11), and a tension spring is fixedly connected between the two, and the extrusion piece (11) abuts against the limit block (10).

4. A drilling-free plug-in graded cementing device for cementing according to claim 3, characterized in that: The power ring (6) is provided with an annular guide surface (601), the connecting block (8) is provided with a guiding inclined surface (801) on a side close to the central axis of the outer shell (1), the supporting ring (9) is provided with a first annular surface (901), and the extrusion piece (11) is provided with a second annular surface (111), the heights of the annular guide surface (601), the guiding inclined surface (801), the first annular surface (901) and the second annular surface (111) all gradually decrease from the outside to the inside, in the direction of the central axis of the outer shell (1), the maximum distance between the second annular surface (111) and the limit block (10) is equal to the minimum distance between the extrusion piece (11) and the guiding inclined surface (801), and the connecting block (8) is located on the moving path of the extrusion piece (11).

5. A drilling-free plug-in graded cementing device for cementing according to claim 4, characterized in that: The minimum inner diameter of the extrusion piece (11) is greater than the inner diameter of the power ring (6), and the minimum diameter of the circle surrounded by all the guide inclined surfaces (801) is equal to the minimum inner diameter of the extrusion piece (11).

6. A drilling-free plug-in graded cementing device for cementing according to claim 4, characterized in that: A wedge-shaped groove (112) is provided on the lower side of the limit block (10), and the second annular surface (111) limits the limit block (10) via the wedge-shaped groove (112), thereby maintaining the limit block (10) in a disengaged state from the adjacent support groove (1001).

7. A drilling-free plug-in graded cementing device for cementing according to claim 4, characterized in that: A locking column (12) is slidably connected inside the outer shell (1), and a second spring is fixedly connected between the two. A locking groove (121) is provided inside the adjusting ring (2), and the locking groove (121) is communicated with the limiting groove (701). Both the locking column (12) and the outer shell (1) are in contact with the limiting block (7), and the limiting block (7) is used to make the upper side surface of the locking column (12) coplanar with the lower side surface of the adjusting ring (2).

8. A drilling-free plug-in graded cementing device for cementing according to claim 7, characterized in that: The elastic coefficient of the second spring on the locking column (12) is smaller than the elastic coefficient of the torsion spring on the limit shift block (7).

9. The drilling-free plug-in graded cementing device for cementing according to claim 4, characterized in that: All the connection blocks (8) are commonly fixedly connected with a mounting ring (13), the mounting ring (13) is sealingly rotatably connected to the adjustment member (5), and an accordion sleeve (14) is commonly fixedly connected between the mounting ring (13) and the power ring (6), and the accordion sleeve (14) is used to shield the power slide groove (501).

10. A drilling-free plug-in graded cementing device for cementing according to claim 9, characterized in that: The power ring (6) is fixedly connected to a shielding tube (15) which is spline-connected to the inner sliding shell (4), and the shielding tube (15) is used to shield the first spring between the power ring (6) and the inner sliding shell (4).

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