A casing connecting nipple for U-shaped connecting wells

Abstract

The present invention discloses a casing connecting short section for U-shaped connecting wells in the field of dust removal technology. A casing is provided on one side of the extended short connecting section, and a connecting mechanism is provided between the casing and the extended short connecting section. Then, a connecting ring 1 and a connecting ring 2 are connected and fixed by a screw, and the screw can penetrate the inside of the perforation, and then the stability of the connection between the extended short connecting section and the casing can be guaranteed. While ensuring the quick installation of the extended short connecting section and the casing, the stability of the pipe body installation can also be guaranteed, and the operability is good; the connecting mechanism includes a connecting ring 1, a connecting ring 2, a buckle block, a sealing gasket, a buckle groove, a screw and a perforation. The connecting ring 1 is fixedly connected to one end position of the outer surface of the extended short connecting section, and the connecting ring 2 is fixedly connected to one side position of the outer surface of the casing. The buckle groove and the perforation are both opened inside the connecting ring 1, which automatically degrades and unblocks, thereby realizing automatic connection between the two wells at the docking point.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal, in particular to a casing connecting nipple for a U-shaped connecting well. Background Art

[0002] Currently, there are four approaches to developing hydrothermal geothermal resources in China, located at depths of approximately 3,000 meters. The first involves directly extracting groundwater from vertical wells without reinjection; the second involves extracting from vertical wells and reinjecting from surrounding vertical wells; the third involves running concentric pipes through the vertical wells, using the internal and external spaces of the pipes for heat exchange between hot and cold water; and the fourth involves forming a U-shaped interconnected well system using a vertical well and a directional (horizontal) well. The first three approaches all suffer from varying degrees of insulated contact between the wellbore and the thermal reservoir, resulting in direct or indirect groundwater extraction, contamination from reinjection, low circulating water flow rates, and low heat exchange rates. Only the fourth approach, currently undergoing trial and application, achieves the goal of "extracting heat without extracting water."

[0003] The fourth method (i.e., U-shaped connecting well) requires solving three technical problems: the first is the docking connection of the two wellbores; the second is effective sealing at the connection point to prevent formation water from entering the wellbore; and the third is milling through the casing at the connection point. After the two wellbores are docked and connected, due to various engineering and measurement errors, it is impossible to ensure that the axes of the two wellbores intersect and penetrate, resulting in a certain degree of spatial offset between the two wellbores. This causes lateral deviation during milling of the casing, making it impossible to effectively connect. Moreover, it is difficult to improve its operating efficiency while ensuring the stability of the pipe body connection. Based on this, the present invention designs a casing connecting short section for U-shaped connecting wells to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a casing connecting nipple for a U-shaped connecting well, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a casing connecting nipple for a U-shaped connecting well, wherein a casing is provided on one side of an extended short pipe, and a connecting mechanism is provided between the casing and the extended short pipe;

[0006] The buckle block is installed through the buckle groove and buckled in the buckle groove, and then the sleeve is rotated, and then the buckle block can be rotated and buckled inside the buckle groove, and then the connecting ring 1 and the connecting ring 2 are connected and fixed by the screw, and the screw can pass through the inside of the through-hole, and then the stability of the connection between the extended short pipe and the sleeve can be guaranteed. While ensuring the quick installation of the extended short pipe and the sleeve, the stability of the pipe body installation can also be guaranteed, and it has good operability; the connecting mechanism includes connecting ring 1, connecting ring 2, buckle block, sealing gasket, buckle groove, screw and through-hole, connecting ring 1 is fixedly connected to one end of the outer surface of the extended short pipe, connecting ring 2 is fixedly connected to one side of the outer surface of the sleeve, the buckle groove and the through-hole are both opened inside the connecting ring 1, the buckle block is fixedly connected to one side of the connecting ring 2, the buckle block is L-shaped, the screw passes through the inside of the connecting ring 2, and one end of the screw is inserted into the inside of the through-hole.

[0007] Preferably, the sealing gasket is arranged on a side opposite to the connecting ring 1 and the connecting ring 2, and the sealing gaskets on the connecting ring 1 and the connecting ring 2 are in contact with each other.

[0008] Preferably, a plurality of reserved holes are opened inside the extended short pipe, and the diameter of the reserved holes is 25 mm.

[0009] Preferably, a temporary blocking member is provided inside the reserved hole, and the temporary blocking member is a water-soluble temporary blocking material that will automatically degrade and unblock.

[0010] Preferably, the sleeve is threadedly connected to the extended short pipe.

[0011] Preferably, the through hole is adjacent to the buckle groove, and the opening position of the buckle groove is greater than the length of the buckle block.

[0012] Preferably, the reserved holes are symmetrically arranged inside the lengthened short connecting pipe.

[0013] Preferably, the temporary plugging piece inside the reserved hole is cast.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The extended casing coupling pup joint, after being plugged with temporary plugging material, has the same functions as the casing in the well, meeting the requirements of casing connection, running and cementing construction. After the temporary plugging material automatically degrades and unblocks, the pup joint becomes a screen pipe pup joint. After the construction of the U-shaped connecting well is completed, the temporary plugging material plugged on the pup joint will automatically degrade and unblock under the action of the well water according to the pre-adjusted automatic degradation time, realizing the automatic connection of the two wells at the docking point.

[0016] When connecting the extended short pipe and the sleeve, the staff can install the buckle block through the buckle groove, buckle it in the buckle groove, and then rotate the sleeve. Then, the buckle block can be rotated and buckled inside the buckle groove, and then the connecting ring 1 and the connecting ring 2 are connected and fixed by the screw. The screw can pass through the inside of the perforation, and then the stability of the connection between the extended short pipe and the sleeve can be guaranteed. While ensuring the quick installation of the extended short pipe and the sleeve, the stability of the pipe body installation can also be guaranteed, and it has good operability.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a combined view of the connecting ring 1 and the buckle block of the present invention;

[0021] Figure 3 This is a combined view of the buckle block and the second connecting ring of the present invention;

[0022] Figure 4 This is a combined view of the reserved hole and the connecting ring 1 of the present invention;

[0023] Figure 5 This is a combined view of the perforation and buckle groove of the present invention.

[0024] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0025] 1. Extended short pipe; 2. Temporary plug; 3. Reserved hole; 4. Connecting ring 1; 5. Buckle block; 6. Connecting ring 2; 7. Sleeve; 8. Sealing gasket; 9. Screw; 10. Perforation; 11. Buckle groove. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0027] See also Figures 1 to 5 The present invention provides a technical solution for a casing connecting short joint for a U-shaped connecting well: a casing 7 is provided on one side of an extended short pipe 1, a connecting mechanism is provided between the casing 7 and the extended short pipe 1, and the casing 7 and the extended short pipe 1 are threadedly connected;

[0028] The staff can install the buckle block 5 through the position of the buckle groove 11, buckle it in the buckle groove 11, and then rotate the sleeve 7. Then, the buckle block 5 can be rotated and buckled inside the buckle groove 11, and then the connecting ring 1 4 and the connecting ring 2 6 are connected and fixed by the screw 9. The screw 9 can pass through the inside of the through-hole 10, and then the stability of the connection between the extended short pipe 1 and the sleeve 7 can be guaranteed. While ensuring the quick installation of the extended short pipe 1 and the sleeve 7, the stability of the pipe body installation can also be guaranteed, and it has good operability. The connecting mechanism includes a connecting ring 1 4, Connecting ring 2 6, buckle block 5, sealing gasket 8, buckle groove 11, screw 9 and through-hole 10, connecting ring 1 4 is fixedly connected to one end of the outer surface of the extended short pipe 1, connecting ring 2 6 is fixedly connected to one side of the outer surface of the sleeve 7, the buckle groove 11 and the through-hole 10 are both opened inside the connecting ring 1 4, the buckle block 5 is fixedly connected to one side of the connecting ring 2 6, the buckle block 5 is L-shaped, the screw 9 passes through the inside of the connecting ring 2 6, one end part of the screw 9 is inserted into the inside of the through-hole 10, the through-hole 10 is adjacent to the buckle groove 11, and the opening position of the buckle groove 11 is greater than the length of the buckle block 5.

[0029] The sealing gasket 8 is arranged on the side opposite to the connecting ring 1 4 and the connecting ring 2 6. The sealing gaskets 8 on the connecting ring 1 4 and the connecting ring 2 6 are in contact with each other. A plurality of reserved holes 3 are opened inside the extended short pipe 1. The diameter of the reserved hole 3 is 25 mm. A temporary blocking part 2 is arranged inside the reserved hole 3. The temporary blocking part 2 is a water-soluble temporary blocking material that will automatically degrade and unblock. The reserved holes 3 are symmetrically arranged inside the extended short pipe 1, and the temporary blocking part 2 inside the reserved hole 3 is cast.

[0030] A specific application of this embodiment is to lengthen the casing coupling and punch it into a screen sub, which is then connected to the casing sub at the lower end. A water-soluble temporary plugging material is poured onto the screen sub, so that its inner diameter is consistent with the inner diameter of the casing and its outer diameter is consistent with the outer diameter of the casing coupling. This is then assembled to the bottom of the directional well (horizontal well) casing, ensuring that the center of the screen sub is located at the connection point. After the U-shaped well group is constructed, the water-soluble temporary plugging material on the screen sub will automatically degrade and unblock, allowing the two wells of the U-shaped well to be connected at the connection point.

[0031] This is an extended casing coupling nipple. Its outer diameter, inner diameter, and end buckle profile conform to API standards, and it is approximately 3 meters long. It features 40 pre-drilled holes, each 25 mm in diameter, in 10 rows. Each row of four holes is oriented 90 degrees to each other, with 125 mm spacing between rows. The holes between rows are oriented at 45 degrees to each other.

[0032] A water-soluble temporary plugging material is poured onto the screen sub, ensuring that the inner coating diameter matches the casing inner diameter. All 40 reserved holes are filled, leaving no coating on the screen exterior. The temporary plugging material's automatic degradation time is adjusted based on construction requirements. The internal pressure resistance of the screen sub after pouring the temporary plugging material must not be lower than the casing internal pressure resistance required during cementing.

[0033] The extended casing coupling pup joint after being plugged with temporary plugging materials has the same function as the casing running into the well, meeting the requirements of casing connection, running and cementing construction.

[0034] After the temporary plugging material is automatically degraded and unblocked, the short section becomes a screen tube short section.

[0035] After the construction of the U-shaped connecting well is completed, the temporary plugging material on the short joint will automatically degrade and unblock under the action of the water in the well according to the pre-adjusted automatic degradation time, realizing the automatic connection of the two wells at the butt joint;

[0036] When connecting the extended short pipe 1 with the sleeve 7, the staff can install the buckle block 5 through the buckle groove 11 and buckle it in the buckle groove 11. Then, the sleeve 7 can be rotated, and the buckle block 5 can be rotated and buckled into the buckle groove 11. Then, the connecting ring 1 4 and the connecting ring 2 6 are connected and fixed through the screw 9. The screw 9 can pass through the inside of the through hole 10, and then the stability of the connection between the extended short pipe 1 and the sleeve 7 can be guaranteed. While ensuring the quick installation of the extended short pipe 1 and the sleeve 7, the stability of the pipe body installation can also be guaranteed, and it has good operability.

[0037] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0038] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A casing connecting nipple for a U-shaped connecting well, characterized in that: It comprises an extended short pipe (1), a sleeve (7) is provided on one side of the extended short pipe (1), and a connecting mechanism is provided between the sleeve (7) and the extended short pipe (1); The connecting mechanism includes a connecting ring 1 (4), a connecting ring 2 (6), a buckle block (5), a sealing gasket (8), a buckle groove (11), a screw rod (9) and a through hole (10), wherein the connecting ring 1 (4) is fixedly connected to one end of the outer surface of the extended short pipe (1), the connecting ring 2 (6) is fixedly connected to one side of the outer surface of the sleeve (7), the buckle groove (11) and the through hole (10) are both provided inside the connecting ring 1 (4), the buckle block (5) is fixedly connected to one side of the connecting ring 2 (6), the buckle block (5) is L-shaped, the screw rod (9) passes through the inside of the connecting ring 2 (6), and one end portion of the screw rod (9) is inserted into the inside of the through hole (10); The sealing gasket (8) is arranged on a side surface opposite to the connecting ring 1 (4) and the connecting ring 2 (6), and the sealing gaskets (8) on the connecting ring 1 (4) and the connecting ring 2 (6) are in contact with each other; A plurality of reserved holes (3) are provided inside the extended short pipe (1), and the diameter of the reserved holes (3) is 25 mm; A temporary blocking member (2) is provided inside the reserved hole (3), and the temporary blocking member (2) is a water-soluble temporary blocking material that will automatically degrade and unblock. The sleeve (7) is threadedly connected to the extended short pipe (1); The through hole (10) is adjacent to the buckle groove (11), and the opening position of the buckle groove (11) is greater than the length of the buckle block (5).

2. The casing connecting nipple for a U-shaped connecting well according to claim 1, characterized in that: The reserved holes (3) are symmetrically arranged inside the extended short pipe (1).

3. The casing connecting nipple for a U-shaped connecting well according to claim 1, characterized in that: The temporary blocking member (2) inside the reserved hole (3) is cast.

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