Soluble anti-slag grading hoop

Abstract

The invention discloses a soluble anti-slag grading hoop, and relates to the technical field of oil well cementing grading hoops, the soluble anti-slag grading hoop comprises a circular barrel arranged in a casing string, the casing string is installed in an oil well, a rubber plug used for assisting grouting is slidably connected in the casing string, and the rubber plug is arranged in the circular barrel. The casing string is provided with two sets of grouting openings used for grouting towards the interior of an oil well. In the process that the grading hoop is used for conducting oil well cementing operation, through mutual cooperation of the elastic supporting assembly, the mounting assembly, the control assembly, the rotating assembly, the plugging assembly and other components, tiny solid particles can be strictly filtered out in the initial stage of grouting, it is ensured that injected cement paste has high purity and good performance, and the grouting efficiency is improved. The high-quality cement sheath is ensured to be formed in a key well section, and cement paste can pass more quickly through transmission and switching of different filtering hole diameters in the subsequent stage of grouting, so that the well cementation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil well cementing grading collars, in particular to a soluble slag-proof grading collar. Background Art

[0002] In cementing operations, cement slurry is injected into the annulus through the inside of the casing string. The graded collar is installed inside the casing string, which can divide the injection of cement slurry into multiple stages at appropriate positions. For example, in the two-stage cementing process, the first-stage cement slurry is injected from the bottom of the casing string. When the injection of the first-stage cement slurry is completed and meets certain requirements, the graded collar installed inside the casing string is used to open the injection channel of the second-stage cement slurry, thereby realizing efficient cementing of different well sections in stages.

[0003] While the grading collar is in use, various solid particle impurities may exist in the casing string. These impurities may come from rock cuttings, rust and other solid substances mixed in the downhole environment generated during the drilling process. These solid particle impurities will enter the annulus through the grouting port of the grading collar along with the cement slurry, affecting the performance of the cement slurry and further reducing the cementing effect. For this reason, we propose a soluble anti-slag grading collar. Summary of the invention

[0004] The object of the present invention is to provide a soluble slag-proof grading collar to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a soluble slag grading collar, comprising a round cylinder arranged inside a casing string, the casing string being installed inside an oil well, a rubber plug for assisting grouting being slidably connected inside the casing string, two groups of grouting ports for grouting toward the inside of the oil well being opened on the casing string, and further comprising:

[0006] A support plate is provided below the circular cylinder, an elastic support assembly for elastically supporting the circular cylinder is provided between the support plate and the lower end of the circular cylinder, a mounting assembly for limiting the position inside the casing column is provided on the support plate, and a control assembly for preventing slag and controlling grouting during grouting is provided above the circular cylinder;

[0007] The control component includes a mounting cylinder rotatably connected to the upper end of the circular cylinder, the mounting cylinder is concentrically arranged with the circular cylinder, and the outer diameter of the mounting cylinder is smaller than the outer diameter of the circular cylinder, an annular plate is fixed to the upper end of the mounting cylinder, an annular operating chamber is formed between the annular plate, the upper end of the circular cylinder and the outer side of the mounting cylinder, the interior of the operating chamber is divided into two groups of a first slag prevention chamber and a second slag prevention chamber by four evenly distributed groups of partitions, the partition is fixed to the outer side of the mounting cylinder, a plurality of groups of first filter holes and second filter holes are provided on the mounting cylinder, the first filter hole is communicated with the interior of the first slag prevention chamber, the second filter hole is communicated with the interior of the second slag prevention chamber, and the aperture of the first filter hole is smaller than the aperture of the second filter hole, a rotating component for rotating the mounting cylinder is provided on the support plate, and a sealing component for sealing the first filter hole and the second filter hole is provided inside the first slag prevention chamber and the second slag prevention chamber.

[0008] Preferably, the rotating assembly includes a sliding hole opened on the circular cylinder, a mounting rod is slidably connected to the sliding hole, one end of the mounting rod is fixed to the support plate, the other end of the mounting rod is located inside the mounting cylinder and is fixed with a circular plate, a first transmission pin is fixed to one side of the circular plate, a vertical groove and a first oblique groove are opened on the inner side of the mounting cylinder, the vertical groove and the first oblique groove are connected end to end, and the first oblique groove is located above the vertical groove, and the first transmission pin is slidably connected to the vertical groove.

[0009] Preferably, the sealing assembly includes a fan-shaped sealing plate slidably connected to the first slag prevention chamber and the second slag prevention chamber, a through groove is provided on the fan-shaped sealing plate, and a transmission assembly for transmitting the fan-shaped sealing plate is provided between the annular plate and the fan-shaped sealing plate.

[0010] Preferably, the transmission assembly includes a mounting block arranged inside the through groove, a connecting assembly for assisting the connection of the mounting block is arranged between the mounting block and the operating chamber, a transmission rod for transmitting against the rubber plug is slidably connected to the annular plate, one end of the transmission rod is fixed to the upper end of the mounting block, a second oblique groove is opened inside the through groove, a second transmission pin is fixed on the mounting block, and the second transmission pin is slidably connected to the second oblique groove.

[0011] Preferably, the connecting assembly includes multiple groups of first sleeves fixed inside the operating cavity, a first sliding rod is slidably connected to the first sleeve, one end of the first sliding rod is fixed to the lower end of the mounting block, and a first spring is sleeved on the outer side of the first sleeve, and both ends of the first spring are respectively against the inner wall of the mounting cavity and the mounting block.

[0012] Preferably, the elastic support assembly includes two groups of T-shaped rods symmetrically arranged and slidably connected to the support plate, one end of the T-shaped rod is fixed to the lower end of the circular cylinder, and a support spring is sleeved on the outer side of the T-shaped rod, and the two ends of the support spring are respectively set to abut the support plate and the bottom of the circular cylinder.

[0013] Preferably, the mounting assembly includes rectangular plates symmetrically arranged on both sides of the support plate, a telescopic assembly for assisting the telescopic connection of the rectangular plates is arranged between the rectangular plates and the support plate, a latch is fixed on one side of the rectangular plates, a socket for limiting the insertion of the latch is arranged inside the casing column, and a pushing pin for pushing the rectangular plates is fixed at the lower ends of the two groups of rectangular plates.

[0014] Preferably, the telescopic assembly includes multiple groups of second sleeves fixed to one side of the rectangular plate, the second sleeves are slidably connected to a second sliding rod, one end of the second sliding rod is fixed to one side of the support plate, and a second spring is sleeved on the outer side of the second sleeve, and the two ends of the second spring are respectively set to resist the rectangular plate and the support plate.

[0015] Preferably, the circular cylinder is made of magnesium alloy.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the process of using the graded hoop for oil well cementing operation, the present invention can strictly filter out tiny solid particles in the initial stage of grouting through the mutual cooperation of the elastic support component, the installation component, the control component, the rotating component and the plugging component, so as to ensure that the injected cement slurry has high purity and good performance, so as to ensure the formation of high-quality cement ring in the key well section, and can also switch different filter apertures through transmission in the subsequent stage of grouting, so that the cement slurry can pass through faster and improve the cementing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the state after the grading collar of the present invention is installed inside the casing string;

[0020] Figure 3 It is a schematic diagram of the structure of the support assembly, the installation assembly and the telescopic assembly of the present invention;

[0021] Figure 4 It is a schematic diagram of the control component structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the first anti-slag chamber and the second anti-slag chamber of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the plugging assembly of the present invention;

[0024] Figure 7 It is a schematic diagram of the transmission assembly structure of the present invention;

[0025] Figure 8 It is a schematic diagram of the structure of the connection assembly of the present invention;

[0026] Fig. 9 It is a schematic diagram of the structure of the rotating assembly of the present invention;

[0027] Fig.10 It is a schematic diagram of the internal structure of the installation tube of the present invention;

[0028] Fig.11 This is a diagram showing the sealing state of the grouting port after the graded collar is installed inside the casing string;

[0029] Fig.12 This is a diagram showing the initial contraction state of the circular tube after the grading collar is installed inside the casing string;

[0030] Fig.13 This is a diagram showing the sealing status of the grouting port after grouting;

[0031] Fig.14 This is a state diagram when the first slag prevention cavity is connected to the grouting port;

[0032] Fig.15 This is a state diagram when the second slag prevention cavity is connected to the grouting port;

[0033] Fig.16 This is a status diagram of the sealing component sealing the grouting port.

[0034] In the figure: 101-oil well; 102-casing string; 103-rubber plug; 104-grouting port; 2-circular cylinder; 3-support plate; 401-T-bar; 402-support spring; 501-rectangular plate; 502-latch pin; 503-push pin; 504-insert hole; 601-second casing; 602-second slide rod; 603-second spring; 701-installation cylinder; 7011-first slag prevention cavity; 7012-second slag prevention cavity; 702-annular plate; 703-second slag prevention cavity; 704-annular plate; 705-second slag prevention cavity; 706-second slag prevention cavity; 707-second slag prevention cavity; 708-second slag prevention cavity; 709-second slag prevention cavity; 701-second slag prevention cavity; 701-second slag prevention cavity; 702-second slag prevention cavity; 703-second slag prevention cavity; 703-second slag prevention cavity; 704-second slag prevention cavity; 705-second slag prevention cavity; 706-second slag prevention cavity; 707-second slag prevention cavity; 708-second slag prevention cavity; 709 ... 03-partition plate; 704-first filter hole; 705-second filter hole; 801-sliding hole; 802-mounting rod; 803-round plate; 804-first transmission pin; 805-vertical groove; 806-first inclined groove; 901-fan-shaped blocking plate; 902-through groove; 1001-mounting block; 1002-transmission rod; 1003-second inclined groove; 1004-second transmission pin; 1101-first sleeve; 1102-first sliding rod; 1103-first spring. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] See also Figure 1-Figure 16 The soluble slag grading collar shown in the figure comprises a round cylinder 2 arranged inside a casing string 102, the casing string 102 is installed inside an oil well 101, a rubber plug 103 for auxiliary grouting is slidably connected inside the casing string 102, and two groups of grouting ports 104 for grouting toward the inside of the oil well 101 are opened on the casing string 102;

[0038] It should be noted here that the installation of the casing string 102, the delivery of the grouting liquid and the pushing of the rubber plug 103 are conventional operating means in the cementing operation in this application, and as a prior art, no further elaboration is given here;

[0039] Also includes:

[0040] A support plate 3 is provided below the circular cylinder 2, an elastic support component for elastically supporting the circular cylinder 2 is provided between the support plate 3 and the lower end of the circular cylinder 2, a mounting component for limiting the position inside the casing column 102 is provided on the support plate 3, and a control component for preventing slag and controlling grouting during grouting is provided above the circular cylinder 2;

[0041] The control assembly includes a mounting cylinder 701 rotatably connected to the upper end of the circular cylinder 2. The mounting cylinder 701 is concentrically arranged with the circular cylinder 2, and the outer diameter of the mounting cylinder 701 is smaller than the outer diameter of the circular cylinder 2. An annular plate 702 is fixed to the upper end of the mounting cylinder 701. An annular operating chamber is formed between the annular plate 702, the upper end of the circular cylinder 2 and the outer side of the mounting cylinder 701. The interior of the operating chamber is divided into two groups of first slag prevention chambers 7011 and second slag prevention chambers 7012 by four evenly distributed partitions 703. The partitions 703 are fixed to the mounting cylinder 701. On the outside, a plurality of first filter holes 704 and second filter holes 705 are provided on the mounting cylinder 701, the first filter holes 704 are communicated with the interior of the first anti-slag cavity 7011, the second filter holes 705 are communicated with the interior of the second anti-slag cavity 7012, and the aperture of the first filter holes 704 is smaller than the aperture of the second filter holes 705, a rotating assembly for rotating the mounting cylinder 701 is provided on the support plate 3, and a blocking assembly for blocking the first filter holes 704 and the second filter holes 705 is provided inside the first anti-slag cavity 7011 and the second anti-slag cavity 7012;

[0042] It is worth noting here that: in the process of using the graded hoop for cementing operation in oil well 101, through the mutual cooperation of the elastic support assembly, the installation assembly, the control assembly, the rotating assembly and the plugging assembly, the tiny solid particles can be strictly filtered out in the initial stage of grouting to ensure that the injected cement slurry has high purity and good performance, so as to ensure the formation of high-quality cement ring in the key well section. In the subsequent stage of grouting, different filter apertures can be switched through transmission to make the cement slurry pass faster and improve the cementing efficiency.

[0043] Preferably, the rotating assembly includes a sliding hole 801 opened on the circular cylinder 2, and a mounting rod 802 is slidably connected to the sliding hole 801, one end of the mounting rod 802 is fixed to the support plate 3, and the other end of the mounting rod 802 is located inside the mounting cylinder 701 and fixed with a circular plate 803, and a first transmission pin 804 is fixed on one side of the circular plate 803, and a vertical groove 805 and a first inclined groove 806 are opened on the inner side of the mounting cylinder 701, and the vertical groove 805 and the first inclined groove 806 are connected end to end, and the first inclined groove 806 is located above the vertical groove 805, and the first transmission pin 804 is slidably connected to the vertical groove 805;

[0044] It is worth noting here that: through transmission, the pressure inside the casing column 102 is further increased after the driving force on the rubber plug 103 is increased. In the process of increasing pressure, the circular cylinder 2 and the installation cylinder 701 are pushed to further move toward the support plate 3 for contraction. In the process of contraction of the circular cylinder 2 and the installation cylinder 701, through the connection between the installation rod 802 and the circular plate 803, the first transmission pin 804 slides on the vertical groove 805 and the first inclined groove 806 in sequence as the installation cylinder 701 descends and contracts. When the first transmission pin 804 slides on the first inclined groove 806, the first transmission pin 804 and the first inclined groove 806 are driven to rotate through the transmission effect of the first transmission pin 804 and the first inclined groove 806.

[0045] It should be noted here that: during the first contraction movement of the circular cylinder 2 and the mounting cylinder 701 against the support plate 3, the first transmission pin 804 slides on the vertical groove 805 through transmission, and the mounting cylinder 701 is not rotated at this time.

[0046] Preferably, the plugging assembly includes a fan-shaped plugging plate 901 slidably connected to the first anti-slag cavity 7011 and the second anti-slag cavity 7012, a through slot 902 is provided on the fan-shaped plugging plate 901, and a transmission assembly for transmitting the fan-shaped plugging plate 901 is provided between the annular plate 702 and the fan-shaped plugging plate 901; the transmission assembly includes a mounting block 1001 provided inside the through slot 902, and a connecting assembly for assisting the connection of the mounting block 1001 is provided between the mounting block 1001 and the operating cavity, a transmission rod 1002 for abutting against the rubber plug 103 is slidably connected to the annular plate 702, one end of the transmission rod 1002 is fixed to the upper end of the mounting block 1001, a second inclined slot 1003 is provided inside the through slot 902, a second transmission pin 1004 is fixed on the mounting block 1001, and the second transmission pin 1004 is slidably connected to the second inclined slot 1003;

[0047] It is worth noting here that: as the rubber plug 103 continues to descend, when the rubber plug 103 abuts against the transmission rod 1002, the transmission rod 1002 and the mounting block 1001 are forced to move downward, and during the movement of the mounting block 1001, the second transmission pin 1004 is driven to slide on the second inclined groove 1003. During the sliding process, the second transmission pin 1004 and the second inclined groove 1003 abut and squeeze each other, so that the fan-shaped blocking plate 901 is driven to move and is located at the front side of the grouting port 104, thereby blocking the grouting port 104.

[0048] Preferably, the connection assembly includes a plurality of first sleeves 1101 fixed inside the operation cavity, the first sleeves 1101 are slidably connected with a first slide bar 1102, one end of the first slide bar 1102 is fixed to the lower end of the mounting block 1001, and a first spring 1103 is sleeved on the outer side of the first sleeve 1101, and the two ends of the first spring 1103 are respectively against the inner wall of the mounting cavity and the mounting block 1001;

[0049] It is worth noting here that: the first sleeve 1101 and the first slide bar 1102 are used to assist the telescopic guidance of the mounting block 1001, and the first spring 1103 is used to facilitate the resetting of the mounting block 1001 after the contraction movement.

[0050] Preferably, the elastic support assembly includes two groups of T-shaped rods 401 symmetrically arranged and slidably connected to the support plate 3, one end of the T-shaped rod 401 is fixed to the lower end of the circular cylinder 2, and a support spring 402 is sleeved on the outer side of the T-shaped rod 401, and the two ends of the support spring 402 are respectively set against the support plate 3 and the bottom of the circular cylinder 2;

[0051] It is worth noting here that: the two groups of T-shaped rods 401 facilitate the telescopic connection between the support plate 3 and the circular cylinder 2, and the support spring 402 facilitates elastic support for the circular cylinder 2.

[0052] Preferably, the mounting assembly includes rectangular plates 501 symmetrically arranged on both sides of the support plate 3, a telescopic assembly for assisting the telescopic connection of the rectangular plates 501 is arranged between the rectangular plates 501 and the support plate 3, a latch 502 is fixed on one side of the rectangular plates 501, a socket 504 for inserting and limiting the latch 502 is arranged inside the casing column 102, and a push pin 503 for pushing the rectangular plates 501 is fixed at the lower ends of the two groups of rectangular plates 501;

[0053] It is worth noting here that: during the installation process, the two groups of rectangular plates 501 are respectively caused to retract toward the support plate 3 through the two groups of pushing pins 503. After the two groups of rectangular plates 501 are retracted, the circular cylinder 2 and the support plate 3 are pushed into the interior of the casing column 102. During the pushing process, each group of latches 502 is respectively aligned with each group of insertion holes 504. After the pushing is completed, the retracted squeezing of the two groups of rectangular plates 501 is released, and the two groups of rectangular plates 501 are pushed to reset by the elastic force of the second spring 603 on the telescopic assembly. During the resetting process of the rectangular plates 501, the front ends of each group of latches 502 are respectively inserted into the interior of each group of insertion holes 504. Through the insertion action of the latches 502 and the insertion holes 504, the pushed-in circular cylinder 2 and the support plate 3 are installed in the interior of the casing column 102.

[0054] Preferably, the telescopic assembly includes a plurality of groups of second sleeves 601 fixed to one side of the rectangular plate 501, a second slide bar 602 is slidably connected to the second sleeve 601, one end of the second slide bar 602 is fixed to one side of the support plate 3, a second spring 603 is sleeved on the outer side of the second sleeve 601, and both ends of the second spring 603 are respectively set against the rectangular plate 501 and the support plate 3;

[0055] It is worth noting here that: the second sleeve 601 and the second slide rod 602 facilitate the telescopic connection of the rectangular plate 501, and the second spring 603 facilitates the reset of the rectangular plate 501 after the contraction movement.

[0056] Preferably, the circular cylinder 2 is made of magnesium alloy;

[0057] It is worth noting here that magnesium alloy is a commonly used soluble material. Magnesium alloy will undergo a chemical reaction in a specific liquid environment underground, such as formation water with a certain mineralization, and gradually dissolve, which is convenient for the subsequent operation and use of the casing string 102.

[0058] In this scheme: a soluble slag-proof grading hoop comprises the following steps:

[0059] During the cementing operation of the oil well 101 using the graded hoop, the circular cylinder 2 is pre-installed in the interior of the casing string 102. During the installation process, the two groups of rectangular plates 501 are respectively caused to contract toward the support plate 3 by two groups of push pins 503. After the two groups of rectangular plates 501 are contracted, the circular cylinder 2 and the support plate 3 are pushed into the interior of the casing string 102. During the pushing process, each group of pins 502 is respectively aligned with each group of insertion holes 504. After the pushing is completed, the contraction and squeezing of the two groups of rectangular plates 501 are released. The elastic force of the second spring 603 on the telescopic assembly pushes the two groups of rectangular plates 501 to reset. During the process of resetting the rectangular plates 501, the front ends of the groups of latches 502 are respectively inserted into the inside of the groups of insertion holes 504. Through the insertion of the latches 502 and the insertion holes 504, the pushed-in circular cylinder 2 and the support plate 3 are installed in the inside of the casing column 102. In the process of installation, as the circular cylinder 2 is pushed into the inside of the casing column 102, the circular cylinder 2 blocks the grouting port 104 of the casing column 102 (see FIG. Fig.11 The grouting port 104 is blocked to prevent part of the water in the annulus between the oil well 101 and the casing string 102 from flowing back into the interior of the casing string 102 through the grouting port 104 after the casing string 102 is placed inside the oil well 101;

[0060] After the circular cylinder 2 is installed, the entire casing string 102 is installed inside the oil well 101. After the installation is completed, the annular space gap generated between the casing string 102 and the oil well 101 is grouting and cementing. During the grouting and cementing process, cement slurry is first injected into the interior of the casing string 102. At this time, the circular cylinder 2 blocks the grouting port 104, so that the injected cement slurry does not enter the annular space gap. After the cement slurry is injected, the rubber plug 103 is put into the interior of the casing string 102 and the cement slurry is squeezed and pushed. During the pushing process, the circular cylinder 2 is forced to move downward through the pressure between the cement slurry and the inside of the casing string 102 and the telescopic connection between the circular cylinder 2 and the support plate 3. During the movement, the circular cylinder 2 no longer blocks the grouting port 104 and as the circular cylinder 2 descends, the first slag prevention cavity 7011 on the operating cavity is communicated with the grouting port 104 (see Fig.12 and Fig.14state), after being connected, as the rubber plug 103 descends and squeezes the cement slurry, the cement slurry inside the casing string 102 passes through the first filter holes 704 of each group of the first slag prevention cavity 7011 and is transported to the annular space through the grouting port 104. During the transportation process, due to the small aperture of the first filter holes 704, in the initial stage, the tiny solid particles are strictly filtered out through the first filter holes 704 to ensure that the injected cement slurry has high purity and good performance, so as to ensure that a high-quality cement ring is formed in the key well section (such as the part close to the production layer). After the cement slurry is squeezed and transported for a period of time, the pushing pressure on the rubber plug 103 is increased. In the process of increasing the thrust, the flow rate of the cement slurry passing through the smaller first filter holes 704 is limited, so that the increase in the thrust is After the driving force of the rubber plug 103, the pressure inside the casing column 102 further increases. In the process of increasing pressure, the circular cylinder 2 and the installation cylinder 701 are pushed to further move toward the support plate 3 for contraction. In the process of contraction of the circular cylinder 2 and the installation cylinder 701, the first transmission pin 804 slides on the vertical groove 805 and the first inclined groove 806 in sequence as the installation cylinder 701 descends and contracts through the connection between the installation rod 802 and the circular plate 803. When the first transmission pin 804 slides on the first inclined groove 806, the first transmission pin 804 and the first inclined groove 806 are driven to rotate through the transmission effect of the first transmission pin 804 and the first inclined groove 806. Through the rotation of the installation cylinder 701, the second slag prevention cavity 7012 on the operating cavity is communicated with the grouting port 104 (see FIG. 1 ). Fig.15 In this case, the cement slurry is transported to the annular space through the second filter hole 705 and the grouting port 104. During the transportation process, since the aperture of the second filter hole 705 on the second slag prevention cavity 7012 is relatively large, the cement slurry can pass through faster in the subsequent stage of grouting, thereby improving the cementing efficiency.

[0061] As the rubber plug 103 continues to descend, when the rubber plug 103 abuts against the transmission rod 1002, the transmission rod 1002 and the mounting block 1001 are forced to move downward. During the movement of the mounting block 1001, the second transmission pin 1004 is driven to slide on the second inclined groove 1003. During the sliding process, the second transmission pin 1004 and the second inclined groove 1003 abut and squeeze each other, so that the fan-shaped blocking plate 901 is forced to move and is located at the front side of the grouting port 104, thereby blocking the grouting port 104 (see FIG. Fig.13 and Fig.16 state), through the blocking effect, the backflow after grouting is avoided, and the grouting operation in the cementing operation is further completed.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soluble slag-proof grading hoop, comprising: A circular cylinder (2) is arranged inside a casing string (102), wherein the casing string (102) is installed inside an oil well (101), a rubber plug (103) for assisting grouting is slidably connected inside the casing string (102), and two groups of grouting ports (104) for grouting toward the inside of the oil well (101) are opened on the casing string (102); It is characterized by further comprising: A support plate (3) is provided below the circular cylinder (2); an elastic support component for elastically supporting the circular cylinder (2) is provided between the support plate (3) and the lower end of the circular cylinder (2); a mounting component for positioning with the inside of the casing column (102) is provided on the support plate (3); and a control component for preventing slag and controlling grouting during grouting is provided above the circular cylinder (2); The control assembly comprises a mounting cylinder (701) rotatably connected to the upper end of the circular cylinder (2); the mounting cylinder (701) is concentrically arranged with the circular cylinder (2); the outer diameter of the mounting cylinder (701) is smaller than the outer diameter of the circular cylinder (2); an annular plate (702) is fixed to the upper end of the mounting cylinder (701); an annular operating chamber is formed between the annular plate (702), the upper end of the circular cylinder (2) and the outer side of the mounting cylinder (701); the interior of the operating chamber is divided into two groups of first slag prevention chambers (7011) and second slag prevention chambers (7012) by four groups of evenly distributed partitions (703); the partitions (703) are fixed to the mounting cylinder (701). ), the mounting tube (701) is provided with a plurality of first filter holes (704) and second filter holes (705), the first filter holes (704) are communicated with the interior of the first anti-slag cavity (7011), the second filter holes (705) are communicated with the interior of the second anti-slag cavity (7012), and the aperture of the first filter holes (704) is smaller than the aperture of the second filter holes (705), the support plate (3) is provided with a rotating component for rotating the mounting tube (701), and the interiors of the first anti-slag cavity (7011) and the second anti-slag cavity (7012) are provided with a blocking component for blocking the first filter holes (704) and the second filter holes (705).

2. The soluble slag-proof grading hoop according to claim 1, characterized in that: The rotating assembly comprises a sliding hole (801) formed on the circular cylinder (2), a mounting rod (802) being slidably connected to the sliding hole (801), one end of the mounting rod (802) being fixed to the support plate (3), the other end of the mounting rod (802) being located inside the mounting cylinder (701) and being fixed with a circular plate (803), a first transmission pin (804) being fixed on one side of the circular plate (803), a vertical groove (805) and a first inclined groove (806) being formed on the inner side of the mounting cylinder (701), the vertical groove (805) and the first inclined groove (806) being connected end to end, and the first inclined groove (806) being located above the vertical groove (805), and the first transmission pin (804) being slidably connected to the vertical groove (805).

3. The soluble slag-proof grading hoop according to claim 2, characterized in that: The sealing assembly comprises a fan-shaped sealing plate (901) slidably connected to the inside of the first slag prevention cavity (7011) and the second slag prevention cavity (7012), a through groove (902) is provided on the fan-shaped sealing plate (901), and a transmission assembly for transmitting the fan-shaped sealing plate (901) is provided between the annular plate (702) and the fan-shaped sealing plate (901).

4. The soluble slag-proof grading hoop according to claim 3 is characterized in that: The transmission assembly comprises a mounting block (1001) arranged inside the through slot (902); a connecting assembly for assisting the connection of the mounting block (1001) is arranged between the mounting block (1001) and the operating chamber; a transmission rod (1002) for resisting and transmitting with the rubber plug (103) is slidably connected to the annular plate (702); one end of the transmission rod (1002) is fixed to the upper end of the mounting block (1001); a second inclined slot (1003) is provided inside the through slot (902); a second transmission pin (1004) is fixed to the mounting block (1001); and the second transmission pin (1004) is slidably connected to the second inclined slot (1003).

5. The soluble slag-proof grading hoop according to claim 4, characterized in that: The connection assembly comprises a plurality of first sleeves (1101) fixed inside the operating cavity, a first slide bar (1102) being slidably connected to the first sleeve (1101), one end of the first slide bar (1102) being fixed to the lower end of the mounting block (1001), a first spring (1103) being sleeved on the outer side of the first sleeve (1101), and two ends of the first spring (1103) respectively abutting against the inner wall of the mounting cavity and the mounting block (1001).

6. The soluble slag-proof grading hoop according to claim 1, characterized in that: The elastic support assembly comprises two groups of T-shaped rods (401) symmetrically arranged and slidably connected to the support plate (3), one end of the T-shaped rod (401) being fixed to the lower end of the circular cylinder (2), a support spring (402) being sleeved on the outer side of the T-shaped rod (401), and two ends of the support spring (402) being respectively arranged to abut against the support plate (3) and the bottom of the circular cylinder (2).

7. The soluble slag-proof grading hoop according to claim 1, characterized in that: The mounting assembly comprises rectangular plates (501) symmetrically arranged on both sides of the support plate (3); a telescopic assembly for assisting the telescopic connection of the rectangular plates (501) is arranged between the rectangular plates (501) and the support plate (3); a latch (502) is fixed on one side of the rectangular plates (501); a socket (504) for inserting and limiting the latch (502) is arranged inside the casing column (102); and a pushing pin (503) for pushing the rectangular plates (501) is fixed at the lower ends of the two groups of rectangular plates (501).

8. The soluble slag-proof grading hoop according to claim 7, characterized in that: The telescopic assembly comprises a plurality of groups of second sleeves (601) fixed to one side of the rectangular plate (501), a second slide bar (602) being slidably connected to the second sleeve (601), one end of the second slide bar (602) being fixed to one side of the support plate (3), a second spring (603) being sleeved on the outer side of the second sleeve (601), and two ends of the second spring (603) being respectively disposed to abut against the rectangular plate (501) and the support plate (3).

9. The soluble slag-proof grading hoop according to claim 1, characterized in that: The circular cylinder (2) is made of magnesium alloy.

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