A no-drill plugging staged cementing device for well cementing

Abstract

The present invention relates to the technical field of graded collars, and in particular to a drill-free graded cementing device for cementing. It comprises: an outer shell, wherein the upper and lower parts of the outer shell are respectively provided with an internal threaded portion and an external threaded portion for connecting the casing, the outer shell is provided with a plurality of fixed grouting holes, and the outer shell is provided with a sealing mechanism and a detachable power mechanism for controlling the opening and closing of the fixed grouting holes; the sealing mechanism comprises: an adjusting ring and a spline ring, the adjusting ring is sealingly and rotatably connected to the outer shell, and the adjusting ring is provided with dynamic grouting holes equal in number to the fixed grouting holes. The present invention utilizes the rotation of the adjusting ring to control the opening and closing of the grouting holes. Compared with the method of controlling the opening and closing of the grouting holes by axial sliding inside the traditional graded collar, there is no need to set a travel space for axial sliding, the length of the outer shell is shortened, and the adaptability of the casing as a whole to complex formation environments 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 well 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 space 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 to remove internal components, and drill-free graded collars using soluble materials.

[0003] The existing pressure-holding ball control solution requires setting up multiple stages of reduced diameter sections inside the grading collar. The pressure-holding balls drive the sliding sleeve to slide axially to change the state of the grouting hole. Since this method requires sufficient axial travel, 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 drill-free plug-free graded cementing device for cementing, which overcomes the disadvantage that the existing graded collar has poor adaptability to narrow underground space.

[0005] Technical solution: A drill-free plug-free staged cementing device for cementing, comprising:

[0006] An outer shell, wherein the upper and lower parts of the outer shell are respectively provided with an internal threaded portion and an external threaded portion 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 removable power mechanism for controlling the opening and closing of the fixed grouting holes;

[0007] The sealing mechanism includes: an adjusting ring and a spline ring, the adjusting ring is sealed 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, the spline ring contacts the adjusting ring and is located between the adjusting ring and the internal threaded portion.

[0008] Furthermore, the power mechanism includes:

[0009] The inner sliding shell, the adjusting member, the power ring and the limit block, the inner sliding shell is slidably connected to the outer shell, the inner sliding shell is rotatably connected to the adjusting member, a power slide groove is provided 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 fixed between the power ring and the inner sliding shell, the adjusting member is rotatably connected to the position of the limit block near the adjusting ring, a torsion spring is fixed between the limit block and the adjusting member, the inner side of the adjusting ring is provided with a limit groove connected to the adjacent dynamic grouting hole, the limit groove limits the limit block, and a dismantling mechanism is provided on the inner sliding shell.

[0010] Furthermore, the dismantling mechanism includes:

[0011] 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 surface of the support groove and the side surface of the adjacent limit block in contact with it are both inclined surfaces, and the height of the above-mentioned inclined surface gradually decreases in the direction from outside to 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.

[0012] Furthermore, the power ring is provided with an annular guide surface, the connecting block is provided with a guide slope on the 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 guide slope, 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 guide slope, and the connecting block is located on the moving path of the extrusion piece.

[0013] 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.

[0014] Furthermore, a wedge-shaped groove is provided on the lower side of the limiting block, and the second annular surface limits the limiting block through the wedge-shaped groove, keeping the limiting block disengaged from the adjacent supporting groove.

[0015] Furthermore, a locking column is slidably connected in the outer shell, and a second spring is fixed between the two. A locking groove is provided in the adjusting ring, and the locking groove is connected to 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.

[0016] 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.

[0017] Furthermore, all the connecting blocks are commonly fixed with a mounting ring, the mounting ring is sealed 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.

[0018] Furthermore, the power ring is fixed 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.

[0019] To sum up, the present application includes at least one of the following beneficial technical effects: the present invention uses 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 stroke space, which shortens the length of the outer shell and improves the overall adaptability of the casing to complex formation environments.

[0020] 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 thus reduce 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.

[0021] The accordion sleeve is used to block 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 blocking tube is used to block 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

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the adjustment ring and the spline ring of the present invention;

[0024] Figure 3 Schematic diagram of the three-dimensional structure of the adjusting member and the support ring of the present invention;

[0025] Figure 4 Schematic diagram of the three-dimensional structure of the power ring and the connecting block of the present invention;

[0026] Figure 5 An exploded view of the adjusting member and the support ring of the present invention;

[0027] Figure 6 The present invention is attached Figure 4 Enlarged view of point A in the middle;

[0028] Figure 7 The present invention is attached Figure 4 Enlarged view of point B in the middle.

[0029] 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 annular surface, 10-limiting block, 1001-support groove, 11-extrusion member, 111-second annular surface, 112-wedge-shaped groove, 12-locking column, 121-locking groove, 13-mounting ring, 14-accordion sleeve, 15-shielding cylinder. DETAILED DESCRIPTION

[0030] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will 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

[0031] This embodiment discloses a drill-free plug-free staged cementing device for cementing, which is used to enhance the adaptability of the staged collar to narrow spaces underground.

[0032] The existing pressure-holding ball control solution requires setting up multi-stage diameter reduction sections inside the grading collar, and driving the sliding sleeve through the pressure-holding ball to change the state of the grouting hole. However, both conventional grading collars and drill-free grading collars will form a permanent diameter 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 diameter 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 space fluid will flow back into the casing, causing cement slurry to flow back and contaminate the wellbore, blocking the production channel, and in severe cases, leading to cement ring seal failure and interlayer crossflow, affecting the production capacity of the oil and gas well.

[0033] See also Figure 1-Figure 3 A 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 internal threaded portion 101 and an external threaded portion 102 for connecting a casing or other downhole tool, 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 inside the outer shell 1.

[0034] See also Figure 2 and Figure 3 The sealing 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 distributed equidistantly in the circumference. 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 its outside through the dynamic grouting holes 201 and the adjacent fixed grouting holes 103; the spline ring 3 is located at the upper part of 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.

[0035] The above setting can realize the opening and closing of the grouting hole controlled by the rotation of the adjusting ring 2. Compared with the method of controlling the opening and closing of the grouting hole by axial sliding inside the traditional grading collar, there is no need to set the 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 surface of the outer shell 1 and the casing as a whole is made smoother, thereby reducing the fluid resistance.

[0036] 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 dial 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 slide 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 symmetrically distributed semi-circular grooves 501. The ball protrudes, and the two hemispherical protrusions of the power ring 6 slide in the adjacent power slide grooves 501 respectively. A first spring is fixed 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 to the limit dial block 7. Initially, the lower side of the limit dial block 7 is fitted with the outer shell 1. An initial force-storing torsion spring is fixed between the limit dial block 7 and the adjusting member 5, so that the limit dial block 7 always has a counterclockwise rotation (this article uses Figure 3 The inner side of the adjusting ring 2 is provided with a limiting groove 701 communicating with the adjacent dynamic grouting hole 201, the limiting groove 701 limits the limiting block 7, and the inner sliding shell 4 is provided with a removal mechanism.

[0037] The above arrangement can be achieved by relying on the contact between the pressure-holding ball and the power ring 6 to isolate the outer shell 1 into two parts, upper and lower. 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 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.

[0038] 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 all slidably connected to the support ring 9. Six support grooves 1001 are provided on the inner side of the spline ring 3. The six limit blocks 10 and the six support grooves 1001 are equidistantly distributed circumferentially. 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 relies on the limit block 10 to limit the support ring 9. 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 outside to 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.

[0039] 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 removing the power mechanism and the removal mechanism from the casing after the grouting is completed, thereby eliminating the reduced diameter section inside the grading collar, and thus 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.

[0040] 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 is connected to the first annular surface 901. The maximum distance between the limit blocks 10 is equal to the minimum distance between the extrusion piece 11 and the guide slope 801. The connecting block 8 is located on the moving path of the extrusion piece 11. The lower part of the extrusion piece 11 is provided with a groove that matches the upper part of the connecting block 8, so that the extrusion piece 11 can slide along the upper part of the connecting block 8 and can contact the upper edge of the guide slope 801; the minimum inner diameter of the extrusion piece 11 is larger than the inner diameter of the power ring 6, and the minimum diameter of the circle surrounded by all the guide slopes 801 is equal to the minimum inner diameter of the extrusion piece 11.

[0041] The above setting can be achieved 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 setting of the extrusion piece 11 and the guide bevel 801 does not affect the normal movement of the pressure-holding ball.

[0042] During the cementing process, the number of required graded collars is determined according to the wellbore depth and the pressure bearing capacity of the formation (this article takes three-stage grouting and three-stage cementing construction, which requires two graded collars, as an example). Then, the specifications of the graded collars are selected according to the inner diameter of the casing. Then, the two outer shells 1 are sequentially connected to the corresponding positions of the casing through threads, and the inner diameters of the two power rings 6 are increased in a step-by-step manner 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-stage cementing construction.

[0043] First-level cementing construction:

[0044] Inject pre-pad fluid into the casing to remove drilling fluid residue and isolate the drilling fluid from cement slurry;

[0045] 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;

[0046] Wait for the cement to initially set and confirm the quality of the first-level cementing;

[0047] A pressure-holding ball (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.

[0048] Secondary cementing construction: injection of pre-pad fluid;

[0049] A fixed 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 downward, compressing the first spring of the power ring 6. During this process, the power ring 6 slides along the power slide 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 is connected 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;

[0050] Wait for the cement to initially set and confirm the quality of the secondary cementing;

[0051] While waiting for the initial setting of the 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 upward 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 block 7, so that the dynamic grouting hole 201 is misaligned with the adjacent fixed grouting hole 103;

[0052] A pressure-holding ball with a diameter larger than the inner diameter of the upper power ring 6 is thrown into the casing. The pressure-holding ball is stuck on the upper power ring 6 to achieve setting. The upper power ring 6 and the pressure-holding ball are used to separate the casing.

[0053] Third-level cementing construction: Repeat the above steps for the second-level cementing construction.

[0054] After the cementing construction is completed, the steps for dismantling 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 part 11 and smaller than its maximum inner diameter, and penetrate it into the casing. Make the strong magnetic salvage device penetrate into the specified depth (that is, the depth of the upper extrusion part 11 relative to the casing end). The strong magnetic salvage device contacts the upper extrusion part 11 and pushes it downward, stretching the tension spring of the extrusion part 11. When the extrusion part 11 contacts the adjacent guiding inclined surface 801, the extrusion part 11 loses contact with the six limit blocks 10. The extrusion part 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.

[0055] During the downward movement of the inner sliding housing 4 , the inner sliding housing 4 drives the adjusting member 5 , the power ring 6 and the limit shift block 7 to move downward together. The limit shift block 7 swings clockwise around its rotation axis and twists the torsion spring of the limit shift block 7 .

[0056] 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 groove 1001. At this time, the six limit blocks 10 are all located on the upward movement path of the extrusion part 11. The worker controls the strong magnetic salvage device to move upward along the casing, and the strong magnetic salvage device drives the extrusion part 11 to move upward through magnetic attraction.

[0057] 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. Finally, the original lower side surface of the limit shift block 7 is in contact with the adjusting piece 5. 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 side power mechanism are the same as above. Example 2

[0058] This embodiment discloses a drill-free plug-free staged cementing device for well cementing, which is further optimized based on the first embodiment.

[0059] 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 .

[0060] 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.

[0061] 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. Then the extrusion piece 11 drives the support ring 9 to move upward through the limit blocks 10. Example 3

[0062] This embodiment discloses a drill-free plug-free staged cementing device for well cementing. Based on the embodiment 1, the reliability of the adjustment ring 2 in sealing the grouting hole is enhanced.

[0063] See also Figure 3 、 Figure 4 and Figure 6 , a locking column 12 is slidably connected to the outer shell 1. Initially, the locking column 12 contacts the limit shift block 7 and is completely located in the outer shell 1, so that a second spring with initial compression and force storage is fixed 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 shift 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 shift block 7.

[0064] The above arrangement can be achieved. Initially, the contact between the limit block 7 and the limiting groove 701 is maintained by utilizing the contact between the limit block 7 and the outer shell 1 and the locking column 12, while keeping the upper side of the locking column 12 and the lower side of the adjusting ring 2 coplanar, so that the adjusting ring 2 can rotate circumferentially; after the cementing construction is completed and the power mechanism is removed, the limit block 7 loses its squeeze on the locking column 12, so that the locking column 12 extends into the locking groove 121 and the limiting 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

[0065] This embodiment discloses a drill-free plug-free staged cementing device for well cementing, which enhances the reliability of the power mechanism during operation based on the first embodiment.

[0066] See also Figure 4-Figure 6 The lower sides of all connecting blocks 8 are commonly fixed with a mounting ring 13, the mounting ring 13 is sealed and rotatably connected to the adjusting member 5, and an accordion sleeve 14 is commonly fixed between the lower side of the mounting ring 13 and the power ring 6; the lower side of the power ring 6 is fixed with a shielding tube 15 spline-connected to the inner sliding shell 4.

[0067] The above setting can be achieved by using the accordion sleeve 14 to block the power slide 501 to prevent cement slurry from entering the power slide 501 and affecting the normal movement of the adjustment part 5 and the power ring 6, and using the blocking tube 15 to block the first spring of the inner sliding 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.

[0068] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A drill-free plug-in staged 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 portion (101) and an external threaded portion (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 blocking mechanism comprises: an adjusting ring (2) and a spline ring (3); the adjusting ring (2) is connected to the outer shell (1) in a sealed and rotatable manner; the adjusting ring (2) is provided with dynamic grouting holes (201) equal in number 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); The power mechanism comprises: An inner sliding shell (4), an adjusting member (5), a power ring (6) and a limit shift 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 slide 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 slide 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 position of the limiting block (7) close to the adjusting ring (2); a torsion spring is fixedly connected between the limiting block (7) and the adjusting member (5); a limiting groove (701) communicating with the adjacent dynamic grouting hole (201) is provided on the inner side of the adjusting ring (2); the limiting groove (701) limits the limiting block (7); and a dismantling mechanism is provided on the inner sliding shell (4).

2. The drill-free plug-free staged cementing device for well cementing according to claim 1, characterized in that: The dismantling mechanism comprises: A plurality of connecting blocks (8), a supporting ring (9), a plurality of limiting blocks (10) and an extrusion piece (11), the inner sliding shell (4) and the supporting ring (9) are both fixedly connected to the connecting block (8), the supporting ring (9) is slidably connected to the spline ring (3), the limiting block (10) is slidably connected to the supporting ring (9), the inner side of the spline ring (3) is provided with supporting grooves (1001) equal in number to the limiting blocks (10), the supporting grooves (1001) limit the adjacent limiting blocks (10), the lower side surface of the supporting groove (1001) and the side surface of the adjacent limiting 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 supporting ring (9) is slidably connected to the extrusion piece (11), and a tension spring is fixedly connected between the above two, and the extrusion piece (11) abuts against the limiting block (10).

3. The drill-free plug-free staged cementing device for well cementing according to claim 2, characterized in that: The power ring (6) is provided with an annular guide surface (601), the connecting block (8) is provided with a guide slope (801) on a side close to the central axis of the outer shell (1), the support 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 guide slope (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 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 guide slope (801), and the connecting block (8) is located on the moving path of the extrusion piece (11).

4. The drill-free plug-free staged cementing device for cementing according to claim 3, 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).

5. The drill-free plug-free staged cementing device for well cementing according to claim 3, characterized in that: A wedge-shaped groove (112) is provided on the lower side of the limiting block (10), and the second annular surface (111) limits the limiting block (10) through the wedge-shaped groove (112), maintaining the limiting block (10) in a state of being disengaged from the adjacent supporting groove (1001).

6. The drill-free plug-free staged cementing device for well cementing according to claim 3, characterized in that: A locking column (12) is slidably connected in the outer shell (1), and a second spring is fixedly connected between the two. A locking groove (121) is provided in the adjusting ring (2), and the locking groove (121) is communicated with the limiting groove (701). The locking column (12) and the outer shell (1) are both 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).

7. The drill-free plug-free staged cementing device for well cementing according to claim 6, 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 limiting shift block (7).

8. The drill-free plug-free staged cementing device for well cementing according to claim 3, characterized in that: All the connecting blocks (8) are fixedly connected to a mounting ring (13), the mounting ring (13) is sealingly and rotatably connected to the adjusting member (5), and an accordion cover (14) is fixedly connected between the mounting ring (13) and the power ring (6), and the accordion cover (14) is used to shield the power slide groove (501).

9. The drill-free plug-free staged cementing device for well cementing according to claim 8, characterized in that: The power ring (6) is fixedly connected to a shielding tube (15) 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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