An in-situ leaching uranium mining process well structure and its implementation method

Abstract

The application provides an in-situ leaching uranium mining process well structure and an implementation method thereof, and relates to the field of in-situ leaching uranium mining.The structure comprises a casing string, the casing string comprising a casing, a filter pipe and a sand setting pipe, the bottom of the sand setting pipe being provided with a first flow-through hole, a grouting cavity being formed in a wellhead when the casing string is used to be arranged in the inside of the wellhead; a subsidy casing, the subsidy casing being fixedly connected to the inner wall surface of the filter pipe, the bottom of the subsidy casing being flush with the bottom of the filter pipe, the top of the subsidy casing being higher than the top of the filter pipe, and a plurality of second flow-through holes being arranged at the top of the subsidy casing, the plurality of second flow-through holes being communicated with the grouting cavity and the first flow-through hole; and a cement slurry detection device, the cement slurry detection device being used to feed back the density value of the overflowed cement slurry at the second flow-through hole.The application can conveniently and accurately position the ore layer section, can reduce the invalid dilution of the leaching agent or the leaching liquid, and can realize the efficient mining of the uranium mine.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of in-situ leaching of uranium, in particular, to a kind of existing in-situ leaching of uranium process well repair, and well structure related thereto and its implementation method. BACKGROUND

[0002] In the prior art, the most commonly used structure of in-situ leaching of uranium process well is gravel filling type structure, in which structure: the pipe string is generally composed of sand settling pipe, filter, casing string and wellhead from bottom to top, wherein the filter, sand settling pipe and the outer space of the lower part of the sand settling pipe are all gravel filled. In the operation process, due to the long length of the gravel filling section below the filter, a large amount of leaching agent or leaching solution seeps through the entire gravel filling section and is diluted, thereby affecting the leaching efficiency. At present, for the repair of such in-situ leaching of uranium process well, the method of plugging or damaging the structure below the filter section, cutting and expanding the filter section, and then filling gravel and lowering the built-in filter is generally used for repair, but this repair method does not solve the problem of dilution in the long seepage section. Therefore, there is an urgent need for an in-situ leaching of uranium process well structure that can accurately locate the ore layer section and reduce the invalid dilution of leaching agent or leaching solution to achieve efficient exploitation of uranium ore. SUMMARY

[0003] The present application aims to provide an in-situ leaching of uranium process well structure and its implementation method to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present application is as follows:

[0004] An in-situ leaching of uranium process well structure, the structure comprising:

[0005] a casing string, the casing string comprising a casing, a filter pipe and a sand settling pipe, the casing being arranged on one side close to the top of the wellhead, the sand settling pipe being arranged on the other side away from the casing, the filter pipe being arranged between the casing and the sand settling pipe, the bottom of the sand settling pipe being provided with a first flow-through hole, when the casing string is arranged inside the wellhead, a grouting cavity is formed in the wellhead;

[0006] a supplemental casing, the supplemental casing being fixedly connected to the inner wall surface of the filter pipe, the bottom of the supplemental casing being flush with the bottom of the filter pipe, the top of the supplemental casing being higher than the top of the filter pipe, and a plurality of second flow-through holes being provided at the top of the supplemental casing, the plurality of second flow-through holes being in communication with the grouting cavity and the first flow-through hole; and

[0007] a cement slurry detection device for feeding back the density value of the overflowed cement slurry at the second flow-through hole.

[0008] Preferably, the axis of the first flow-through hole is parallel to the axis of the wellhead, and the axis of each second flow-through hole is perpendicular to the axis of the wellhead.

[0009] Preferably, the number of the second flow-through holes is four, and the four second flow-through holes are evenly arranged on the outer circumferential surface of the patch sleeve.

[0010] Preferably, a cement ring and a cement plug are arranged in the wellhead, the cement ring is arranged above the cement plug, the cement plug is below the grouting cavity, the setting height of the filter pipe and the sand pipe corresponds to the cavity height of the grouting cavity, and the setting height of the sleeve corresponds to the cement ring and the cement plug.

[0011] Preferably, the first expansion sealing ring is arranged on the outer wall surface at the top of the patch sleeve, and the second expansion sealing ring is arranged on the outer wall surface at the bottom of the patch sleeve; wherein the patch sleeve is a thin-walled UPVC pipe, the wall thickness of the patch sleeve ranges from 1 mm to 3 mm, the inner diameter of the patch sleeve is 2-10 mm smaller than the inner diameter of the filter pipe, and the length of the patch sleeve is 20-40 mm longer than the length of the filter pipe.

[0012] Preferably, the outer wall surface of the patch sleeve is provided with an expansion sealing ring mounting groove, and the first expansion sealing ring and the second expansion sealing ring are fixedly installed in the expansion sealing ring mounting groove.

[0013] Preferably, the cement slurry detection device comprises an online density meter and a display device, the online density meter is arranged outside a single second flow-through hole, the display device is arranged outside the wellhead, and the online density meter and the display device are electrically connected.

[0014] Preferably, the method further comprises a grouting device, the grouting device comprises a grouting pipe and a packer, the bottom of the grouting pipe is provided with a grouting pipe head, the grouting pipe sequentially passes through the inside of the casing string and the inside of the patch sleeve, until the grouting pipe head is arranged in the sand pipe, and the grouting pipe head corresponds to the position of the first flow-through hole, and the packer is arranged at a position 20 cm-30 cm above the grouting pipe head.

[0015] In addition, the present application provides an implementation method of an in-situ leaching uranium process well, the method comprising:

[0016] The grouting device is installed: the bottom of the grouting pipe is provided with a grouting pipe head, a packer is installed at a position 20 cm-30 cm above the grouting pipe head, then the grouting pipe sequentially passes through the inside of the casing string and the inside of the patch sleeve, until the grouting pipe head is arranged in the sand pipe, and the grouting pipe head corresponds to the position of the first flow-through hole.

[0017] After the setting of the packer, grouting operation is carried out in the grouting pipe through the first flow-through hole, the cement slurry fills the grouting cavity, until the cement slurry overflows from the second flow-through hole, and the overflow cement slurry density value is fed back through the cement slurry detection device;

[0018] When the overflow cement slurry density value reaches the preset value, the grouting operation is stopped;

[0019] After the cement slurry is finally cured, the packer is unsealed, and the packer and the grouting pipe are recycled;

[0020] Lower cutter: cutting cement between the patching casing and the filter pipe, and using drilling fluid flowback to cut debris;

[0021] Abrasive jet: abrasive jet on the cut filter pipe wall, 2-3 vertical seams are shot at a preset height to form a jet channel, which is used for in-situ leaching operation in a preset ore layer section.

[0022] Preferably, before installing the grouting device, it comprises:

[0023] According to the inner diameter of the casing string, the inner diameter of the filter pipe and the length of the filter pipe, the inner diameter of the patching casing and the length of the patching casing are obtained;

[0024] Install the expansion sealing ring: install the first expansion sealing ring and the second expansion sealing ring on the patching casing, and a plurality of second flow-through holes are arranged at a position 10-20mm vertically downward from the first expansion sealing ring;

[0025] Install the patching casing: the patching casing is fixedly connected to the inner wall surface of the filter pipe, the bottom of the patching casing is flush with the bottom of the filter pipe, and the top of the patching casing is higher than the top of the filter pipe;

[0026] Install the cement slurry detection device: the online density meter is arranged outside the single second flow-through hole, and the display device is arranged outside the wellhead, and the online density meter and the display device are electrically connected.

[0027] The beneficial effects of the present application are:

[0028] The present application aims at the problem of serious solution dilution of in-situ leaching uranium well, and provides an in-situ leaching uranium process well structure and an implementation method thereof, which realizes reduction of invalid dilution of leaching agent or leaching solution by reconstructing the length of the filtration section in the well and precisely controlling the trend of the leaching agent.

[0029] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by means of the instrumentalities particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 It is a schematic diagram of the overall structure of the repair device;

[0032] Figure 2 It is a schematic diagram of the specific structure of the first flow-through hole and the second flow-through hole in the embodiment of the present application;

[0033] Figure 3 It is a schematic diagram of the structure of the grouting pipe and the packer in the embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the structure of the local area of the cement sheath in the embodiment of the present application;

[0035] Figure 5 It is a schematic diagram of the flow of the cement slurry in the embodiment of the present application;

[0036] Markings in the figure:

[0037] 11, casing; 12, filter pipe; 13, sand pipe; 130, first flow hole; 2, well head; 20, grouting cavity; 21, cement ring; 22, cement plug; 3, patch casing; 30, second flow hole; 41, online density meter; 42, display device; 51, first expansion sealing ring; 52, second expansion sealing ring; 61, grouting pipe; 62, packer. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative work based on the embodiments in the present application belong to the scope of protection of the present application.

[0039] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0040] Embodiment one:

[0041] As shown in Figure 1 and Figure 2 , a structure of an in-situ leaching uranium mine well includes:

[0042] a casing string, the casing string includes a casing 11, a filter pipe 12 and a sand pipe 13, the casing 11 is arranged on one side close to the top of a well head 2, the sand pipe 13 is arranged on the other side away from the casing 11, the filter pipe 12 is arranged between the casing 11 and the sand pipe 13, the bottom of the sand pipe 13 is provided with a first flow hole 130, when the casing string is arranged inside the well head 2, a grouting cavity 20 is formed in the well head 2;

[0043] A subsidy sleeve 3 is fixedly connected to the inner wall of the filter pipe 12, the bottom of the subsidy sleeve 3 is flush with the bottom of the filter pipe 12, the top of the subsidy sleeve 3 is higher than the top of the filter pipe 12, and a plurality of second flow holes 30 are arranged at the top of the subsidy sleeve 3, the plurality of second flow holes 30 are in communication with the first flow hole 130 and the grouting cavity 20; and

[0044] A cement slurry detection device is arranged to feed back the density value of the overflowed cement slurry at the second flow hole 30.

[0045] The bottom of the sand setting pipe 13 is provided with a first flow hole 130, and the diameter of the first flow hole 130 is 20-40 mm.

[0046] The subsidy sleeve 3 can be a thin-walled UPVC pipe, and the wall thickness of the subsidy sleeve 3 is 1-3 mm; the inner diameter of the subsidy sleeve 3 is 2-10 mm smaller than that of the filter pipe 12; and the length of the subsidy sleeve 3 is 20-40 mm longer than that of the filter pipe 12.

[0047] As shown in Figure 3 In the device, a grouting device is introduced to facilitate grouting operation, the grouting device includes a grouting pipe 61 and a packer 62, the bottom of the grouting pipe 61 is provided with a grouting pipe head, the grouting pipe 61 passes through the inside of the casing string and the inside of the subsidy sleeve 3 in sequence, and the grouting pipe head is arranged in the sand setting pipe 13 and corresponds to the first flow hole 130 in position, and the packer 62 is arranged at a position 20-30 cm above the grouting pipe head.

[0048] Preferably, the vertical distance between the grouting pipe head and the first flow hole 130 is 10-20 cm.

[0049] In the device, to determine the spatial positions of the first flow hole 130 and the second flow hole 30, the axis of the first flow hole 130 is parallel to the axis of the wellhead 2, and the axis of each second flow hole 30 is perpendicular to the axis of the wellhead 2. In this structure, the cement slurry flows smoothly, the data measured by the cement slurry detection device has small deviation, and the feedback of stopping grouting operation is facilitated.

[0050] In the device, when a plurality of second flow holes 30 are arranged, a cement slurry detection device can be arranged at each second flow hole 30. When grouting operation is performed in the later stage, the density of the cement slurry collected at each second flow hole 30 can be calculated by mean value to reduce the misjudgment of the grouting amount.

[0051] Further, the second flow-through hole 30 is arranged in four, and the four second flow-through holes 30 are arranged on the outer circumferential surface of the support casing 3.

[0052] In the device, in order to clearly define the installation structure of the casing string and the specific position of the grouting cavity 20, the wellhead 2 is provided with a cement ring 21 and a cement plug 22, the cement ring 21 is arranged above the cement plug 22, the grouting cavity 20 is below the cement plug 22, the setting height of the filter pipe 12 and the sand pipe 13 corresponds to the cavity height of the grouting cavity 20, and the setting height of the casing 11 corresponds to the cement ring 21 and the cement plug 22.

[0053] In the device, in order to realize the sealing effect and increase the diameter of the support casing, the first expansion sealing ring 51 and the second expansion sealing ring 52 are introduced, the first expansion sealing ring 51 is arranged on the outer wall surface of the top of the support casing 3, and the second expansion sealing ring 52 is arranged on the outer wall surface of the bottom of the support casing 3.

[0054] In the fixing process of the expansion sealing ring, the expansion sealing ring is fixed on the wall surface of the filter pipe 12 by water absorption expansion. The sealing pressure of the expansion sealing ring after expansion is set to 1-2 MPa.

[0055] Further, the outer wall surface of the support casing 3 is provided with an expansion sealing ring mounting groove, and the first expansion sealing ring 51 and the second expansion sealing ring 52 are fixedly installed in the expansion sealing ring mounting groove.

[0056] In the device, in order to clearly define the positions of the first expansion sealing ring 51 and the second flow-through hole 30, the second flow-through hole 30 is arranged 10-20 mm below the first expansion sealing ring 51.

[0057] As shown in Figure 4 In order to clearly define the specific structure of the cement slurry detection device, the cement slurry detection device includes an online densimeter 41 and a display device 42, the online densimeter 41 is arranged outside the single second flow-through hole 30, the display device 42 is arranged outside the wellhead 2, and the online densimeter 41 and the display device 42 are electrically connected.

[0058] Embodiment two:

[0059] A kind of in-situ leaching uranium process well implementation method, uses the above in-situ leaching uranium process well structure, including:

[0060] Install the grouting device: the bottom of the grouting pipe 61 is provided with a grouting pipe head, a packer 62 is installed 20-30 cm above the grouting pipe head, and then the grouting pipe 61 is sequentially passed through the inside of the casing string and the inside of the patch casing 3 until the grouting pipe head is arranged in the sand trap pipe 13, and the grouting pipe head corresponds to the position of the first flow-through hole 130;

[0061] The packer 62 is pressed to seal, grouting is carried out in the grouting pipe 61 through the first flow-through hole 130 after the sealing is completed, the cement slurry fills the grouting cavity 20, and the overflow cement slurry density value is fed back through the cement slurry detection device until the cement slurry overflows from the second flow-through hole 30.

[0062] As shown in the flow diagram of the cement slurry in the method. Figure 5

[0063] When the overflow cement slurry density value reaches the preset value, stop the grouting operation; specifically: when the density value detected by the online densimeter 41 increases by 0.1-0.3 g / cm 3 , stop the grouting operation.

[0064] After the cement slurry is finally set, the packer 62 is unsealed, and the packer 62 and the grouting pipe 61 are recycled;

[0065] Lower cutter: cutting the cement of the patch casing 3 and the patch casing 3 and the filter pipe 12, and using drilling fluid to cut and remove the cuttings;

[0066] Abrasive jet: abrasive jet on the wall surface of the cut filter pipe 12, 2-3 vertical seams are shot at a preset height to form a jet channel, and the jet channel is used for in-situ mining in a preset ore layer section. The jet channel penetrates the filter pipe and the finally set cement and then penetrates into the ore layer.

[0067] In the embodiment, before the grouting device is installed, the following steps are included:

[0068] According to the inner diameter of the casing string, the inner diameter of the filter pipe 12 and the length of the filter pipe 12, the inner diameter of the patch casing 3 and the length of the patch casing 3 are obtained;

[0069] Install the expansion sealing ring: install the first expansion sealing ring 51 and the second expansion sealing ring 52 on the patch casing 3, and a plurality of second flow-through holes 30 are arranged at a position vertically downward 10-20 mm from the first expansion sealing ring 51;

[0070] Install the patch casing 3: the patch casing 3 is fixedly connected to the inner wall surface of the filter pipe 12, the bottom of the patch casing 3 is flush with the bottom of the filter pipe 12, and the top of the patch casing 3 is higher than the top of the filter pipe 12. ​

[0071] Install the cement slurry detection device: set the online densimeter 41 outside the single second flow hole 30, set the display device 42 outside the well mouth 2, and the online densimeter 41 and the display device 42 are electrically connected.

[0072] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

[0073] The above only describes the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An in-situ leaching of uranium process well structure characterised in that, The utility model relates to a cement slurry injection device and cement slurry detection device for wellhead, which comprises: a casing string, the casing string comprises a casing (11), a filter pipe (12) and a sand pipe (13), the casing (11) is used for being arranged at one side close to the top of wellhead (2), the sand pipe (13) is arranged at the other side away from the casing (11), the filter pipe (12) is arranged between the casing (11) and the sand pipe (13), the bottom of the sand pipe (13) is provided with first flow-through hole (130), when the casing string is used for being arranged in the inside of wellhead (2), the grouting cavity (20) is formed in the wellhead (2); a supplementary casing (3) is fixedly connected on the inner wall surface of the filter pipe (12), the bottom of the supplementary casing (3) is flush with the bottom of the filter pipe (12), the top of the supplementary casing (3) is higher than the top of the filter pipe (12), and a plurality of second flow-through holes (30) are arranged at the top of the supplementary casing (3), and the plurality of second flow-through holes (30) are communicated with the grouting cavity (20) and the first flow-through hole (130);And a cement slurry detection device is used for feeding back the density value of overflowed cement slurry at the second flow-through hole (30).

2. An in-situ leaching of uranium process well structure according to claim 1, characterised in that, The wellhead (2) is provided with a cement sheath (21) and a cement plug (22), the cement sheath (21) is arranged above the cement plug (22), the grouting cavity (20) is below the cement plug (22), the setting height of the filter pipe (12) and the sand pipe (13) corresponds to the cavity height of the grouting cavity (20), and the setting height of the casing (11) corresponds to the cement sheath (21) and the cement plug (22).

3. An in-situ leaching of uranium process well structure according to claim 1, characterised in that, The utility model relates to a cement slurry injection device and cement slurry detection device for wellhead, which comprises:

4. An in-situ leaching uranium mine well structure according to claim 1 wherein, the axis of the first flow-through hole (130) is parallel with the axis of the wellhead (2), and the axis of each second flow-through hole (30) is perpendicular to the axis of the wellhead (2).

5. An in-situ leaching uranium mine well structure according to claim 4 wherein, The number of the second flow-through hole (30) is four, and the four second flow-through holes (30) are evenly arranged on the outer circumferential surface of the supplementary casing (3). The bottom of the supplementary casing (3) is flush with the bottom of the filter pipe (12), the top of the supplementary casing (3) is higher than the top of the filter pipe (12), and a plurality of second flow-through holes (30) are arranged at the top of the supplementary casing (3), and the plurality of second flow-through holes (30) are communicated with the grouting cavity (20) and the first flow-through hole (130);And a cement slurry detection device is used for feeding back the density value of overflowed cement slurry at the second flow-through hole (30). The utility model relates to a cement slurry injection device and cement slurry detection device for wellhead, which comprises: the first flow-through hole (130) is arranged on the bottom of the sand pipe (13), the first flow-through hole (130) is communicated with the grouting cavity (20), and the first flow-through hole (130) is communicated with the second flow-through hole (30) arranged on the supplementary casing (3) and the grouting cavity (20) in the wellhead (2).

6. An in-situ leaching uranium mine well structure according to claim 1 wherein, The first expansion sealing ring (51) is arranged on the outer wall surface of the top of the subsidy sleeve pipe (3), and the second expansion sealing ring (52) is arranged on the outer wall surface of the bottom of the subsidy sleeve pipe (3), wherein the subsidy sleeve pipe (3) is a thin-walled UPVC pipe, the wall thickness of the subsidy sleeve pipe (3) ranges from 1 mm to 3 mm, the inner diameter of the subsidy sleeve pipe (3) is 2-10 mm smaller than the inner diameter of the filter pipe (12), and the length of the subsidy sleeve pipe (3) is 20-40 mm longer than the length of the filter pipe (12).

7. An in-situ leaching uranium mine well structure according to claim 6 wherein, An expansion sealing ring mounting groove is arranged on the outer wall surface of the subsidy sleeve pipe (3), and the first expansion sealing ring (51) and the second expansion sealing ring (52) are fixedly installed in the expansion sealing ring mounting groove.

8. An in-situ leaching of uranium process well structure according to claim 1 wherein, The cement slurry detection device comprises an online density meter (41) and a display device (42), the online density meter (41) is arranged outside the single second flow-through hole (30), the display device (42) is arranged outside the wellhead (2), and the online density meter (41) and the display device (42) are electrically connected.

9. A method of implementing an in-situ leaching of uranium process well, characterised by, The in-situ leaching uranium mining process well structure of any one of claims 1 to 8 is used, comprising: The grouting device is installed: the bottom of the grouting pipe (61) is provided with a grouting pipe head, a packer (62) is installed at a position 20 cm-30 cm above the grouting pipe head, then the grouting pipe (61) passes through the inside of the casing string and the inside of the subsidy sleeve pipe (3) in sequence until the grouting pipe head is arranged in the sand trap pipe (13) and the grouting pipe head corresponds to the position of the first flow-through hole (130); The packer (62) is pressed and sealed, grouting is carried out in the grouting pipe (61) through the first flow-through hole (130) after the sealing is completed, the cement slurry fills the grouting cavity (20), and the cement slurry overflows from the second flow-through hole (30) and the density value of the overflowed cement slurry is fed back through the cement slurry detection device; When the density value of the overflowed cement slurry reaches a preset value, the grouting is stopped; After the cement slurry is finally cured, the packer (62) is unsealed, and the packer (62) and the grouting pipe (61) are recycled; The lower cutter cuts the subsidy sleeve pipe (3) and the cement between the subsidy sleeve pipe (3) and the filter pipe (12), and the drilling fluid is used to cut and remove the cuttings; Abrasive jet: abrasive jet is performed on the wall surface of the cut filter pipe (12), 2-3 vertical seams are shot at a preset height, a jet flow channel is formed, and the jet flow channel is used for in-situ leaching mining in a preset ore layer section.

10. A method according to claim 9, wherein, Before the grouting device is installed, comprising: According to the inner diameter of the casing string, the inner diameter of the filter pipe (12) and the length of the filter pipe (12), the inner diameter of the subsidy sleeve pipe (3) and the length of the subsidy sleeve pipe (3) are obtained; The expansion sealing ring is installed: the first expansion sealing ring (51) and the second expansion sealing ring (52) are installed on the subsidy sleeve pipe (3), and a plurality of second flow-through holes (30) are arranged at a position 10-20 mm vertically downward from the first expansion sealing ring (51). Install the subsidy sleeve (3): The subsidy sleeve (3) is fixedly connected to the inner wall of the filter tube (12), the bottom of the subsidy sleeve (3) is flush with the bottom of the filter tube (12), and the top of the subsidy sleeve (3) is higher than the top of the filter tube (12). Install the cement slurry detection device: Set the online density meter (41) outside the single second flow hole (30) and set the display device (42) outside the wellhead (2), and the online density meter (41) and the display device (42) are electrically connected.

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