Sand control screen pipe, method for machining sand control screen pipe, roller die and extrusion die

Abstract

The invention relates to a sand control screen pipe, a method for machining the sand control screen pipe, a roller die and an extrusion die, the sand control screen pipe comprises a base pipe and a filter sleeve, the two ends of the filter sleeve are compacted on the base pipe through mechanical extrusion closing, the two ends of the filter sleeve are fixedly connected with the base pipe, and the filter sleeve sequentially comprises an outer protective sleeve, a filter layer and an inner protective sleeve from outside to inside; the filter layer is of an annular structure formed by winding at least one layer of metal wire woven mesh on the inner protective sleeve, and the filter layer is compacted by the outer protective sleeve and the inner protective sleeve through mechanical extrusion. According to the invention, the purpose of tight contact of the lap joint parts of the filter layer in the circumferential direction is realized by adopting mechanical compaction, so that the purpose of sand prevention and sealing in the circumferential direction is realized; the purpose that the two ends of the filter sleeve are tightly attached to the base pipe is achieved through mechanical extrusion, and therefore the purpose of sand prevention and sealing of the ends is achieved. Therefore, the sand prevention integrity of the filter sleeve is guaranteed, and compared with the prior art, irreversible mechanical damage caused by welding to the metal wire woven mesh is avoided.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field development technology, specifically relating to a sand control screen used in the oil and gas field development process, a method for processing the sand control screen, a roller mold, and an extrusion mold. Background Technology

[0002] During the completion phase of oil and gas wells, sand screens are typically installed in the producing section to prevent sand and gravel from the formation from entering the wellbore along with the oil and gas flow, thus negatively impacting normal production. This is especially important for high-yield wells in loose formations, where sand screens are particularly crucial during the completion phase.

[0003] Conventional metal mesh sand control screens use woven metal wire mesh as their key filtration material, and are mostly formed into filter sleeves by rolling. After the planar woven metal wire mesh is rolled into a filter sleeve, the sand-proof sealing of the circumferential overlap and both ends needs to be addressed to ensure the overall sand-proof integrity of the sand control screen. The current mainstream approach is to use resistance welding to perform straight seam welding along the axial direction on the circumferential overlap of the woven metal wire mesh, and simultaneously use resistance welding to perform circumferential welding on the two ends of the rolled filter sleeve, thereby achieving a sand-proof seal for the entire filter sleeve. However, resistance welding is a complex process, requiring a water-cooling system and is itself inefficient; additional end rings are needed to support the woven metal wire mesh during end welding, increasing material costs; resistance welding can also cause irreversible mechanical damage to the woven metal wire mesh, reducing the corrosion resistance of the weld and the surrounding woven metal wire mesh material, thus affecting the overall mechanical and corrosion resistance of the sand control screen.

[0004] Therefore, it is necessary to develop a new structure for sand-proof screen pipes and its supporting manufacturing process to address the above problems. Summary of the Invention

[0005] To address all or part of the aforementioned problems, the present invention aims to provide a sand-proof screen pipe, a method for processing the sand-proof screen pipe, a roller mold, and an extrusion mold. The sand-proof screen pipe of the present invention ensures the sand-proof integrity of the filter sleeve, avoids irreversible mechanical damage to the metal wire mesh caused by welding compared to the prior art, and ensures the overall mechanical and corrosion-resistant properties of the sand-proof screen pipe product.

[0006] According to one aspect of the present invention, a sand-proof screen pipe is provided, comprising a base pipe and a filter sleeve fitted on the base pipe, wherein the two ends of the filter sleeve are mechanically squeezed and pressed onto the base pipe, and the two ends of the filter sleeve are fixedly connected to the base pipe.

[0007] Furthermore, the filter sleeve consists of an outer protective sleeve, a filter layer, and an inner protective sleeve from the outside to the inside. The filter layer is an annular structure formed by at least one layer of woven metal wire mesh wrapped around the inner protective sleeve. The outer protective sleeve and the inner protective sleeve compact the filter layer by mechanical extrusion.

[0008] Furthermore, it also includes pressure rings on both sides of the filter sleeve. The pressure rings and the filter sleeve are pressed together onto the base tube by mechanical extrusion. The integral formed by the pressure rings and the filter sleeve is fixedly connected to the base tube by welding.

[0009] Furthermore, the inner sides of both ends of the filter sleeve are respectively provided with end rings. The two ends of the filter sleeve are mechanically squeezed and pressed onto the corresponding end rings. The two ends of the filter sleeve are respectively welded to the corresponding end rings. Both end rings are fixed to the base tube by welding.

[0010] Furthermore, the base tube is also provided with a wire-wound sleeve, which is located between the two end rings, and the outer diameter of the two end rings is equivalent to the outer diameter of the wire-wound sleeve.

[0011] Furthermore, the upper ends of the inner protective sleeve and the outer protective sleeve are flush with the upper end of the filter layer, and the lower ends of the inner protective sleeve and the outer protective sleeve are flush with the lower end of the filter layer.

[0012] Furthermore, it also includes two end rings. The upper end of the outer protective sleeve is flush with the upper end of the filter layer, and the lower end of the outer protective sleeve is flush with the lower end of the filter layer. The two ends of the integral formed by the filter layer and the outer protective sleeve are mechanically squeezed and pressed onto the corresponding end rings. The two ends of the integral formed by the filter layer and the outer protective sleeve are respectively fixed to the corresponding end rings by welding. The inner protective sleeve is located between the two end rings, and the two end rings are respectively fixed to the base tube.

[0013] Furthermore, it also includes a fluid control mechanism, wherein one of the end rings is fixedly connected to the fluid control mechanism by welding. Annular space gaps are provided between the end ring and the base pipe, between the fluid control mechanism that mates with the end ring and the base pipe, and between the inner protective sleeve and the base pipe. The fluid control mechanism is fixed to the base pipe.

[0014] Furthermore, the filter sleeve includes an outer protective sleeve, a filter layer, a wire-wound sleeve, and two end rings. The wire-wound sleeve is located between the two end rings, and the outer diameter of the wire-wound sleeve is equivalent to the outer diameter of the two end rings. The inner diameter of the wire-wound sleeve is equivalent to the inner diameter of the two end rings. The filter layer is an annular structure consisting of at least one layer of woven metal wire mesh wrapped around the wire-wound sleeve and extending to both sides to the end rings corresponding to the covered portions. The outer protective sleeve is fitted over the filter layer. The outer protective sleeve presses the filter layer firmly onto the wire-wound sleeve by mechanical compression. The portions of the outer protective sleeve and the filter layer covering the end rings are pressed firmly onto the end rings by mechanical compression. The two end faces of the outer protective sleeve and the filter layer, forming an integral whole, are fixed to the two end rings by welding. The two end rings are fixed to the base tube by welding.

[0015] Furthermore, it also includes pressure rings on both sides of the outer protective sleeve. The pressure rings, together with the outer protective sleeve and the filter layer, are mechanically squeezed and pressed onto the end ring. The pressure rings, together with the outer protective sleeve and the filter layer, are fixedly connected to the end ring by welding.

[0016] The present invention also provides an extrusion die for processing sand-proof screen pipes. The extrusion die includes several fan-shaped rings. The fan-shaped rings are spliced ​​together to form an annular structure that can surround the filter sleeve. In use, the amount of extrusion deformation of the two ends of the filter sleeve can be adjusted by changing the minimum diameter of the inscribed circle formed by the multiple fan-shaped rings or by changing the radial stroke of the fan-shaped rings.

[0017] The present invention also provides a method for processing sand-proof screen pipes, comprising: The process yields a base tube and a filter sleeve; The filter sleeve is pressed firmly onto the base tube by extrusion using a die; the die is as described above. The two ends of the filter sleeve are fixed to the base tube respectively.

[0018] The present invention also provides a roller mold for processing sand-proof screen pipes. The roller mold includes at least a pair of rollers, each of which is provided with an arc surface for fitting with the outer protective sleeve of the filter sleeve. In use, by changing the size of the arc surface, the outer protective sleeve and the inner protective sleeve are mechanically squeezed to compact the filter layer.

[0019] The present invention also provides a method for processing sand-proof screen pipes, comprising: The base tube is obtained through processing; The filter layer is compacted by pressing with a roller mold to obtain the filter sleeve; the roller mold is as described above. The filter sleeve is pressed firmly onto the base tube by extrusion using a die; the die is as described above. The two ends of the filter sleeve are fixed to the base tube respectively.

[0020] As can be seen from the above technical solutions, the sand-proof screen pipe, the method for processing the sand-proof screen pipe, the roller mold, and the extrusion mold provided by the present invention have the following beneficial effects: This invention replaces existing welding technology with mechanical compaction, ensuring tight contact of the overlapping parts of the filter layer in the circumferential direction, thus achieving circumferential sand-proof sealing. Mechanical extrusion ensures that both ends of the filter sleeve are tightly adhered to the base pipe, preventing sand and gravel from entering the filter sleeve from both ends, thus achieving end sand-proof sealing. Therefore, this invention guarantees the sand-proof integrity of the filter sleeve, avoids irreversible mechanical damage to the metal wire mesh caused by welding compared to existing technologies, ensures the mechanical and corrosion-resistant properties of the sand-proof screen pipe product, and simultaneously improves production efficiency, reduces the number of parts, and thus lowers production costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the sand-proof screen pipe according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the end of the sand-proof screen pipe according to Embodiment 1 of the present invention; Figure 3 A cross-sectional schematic diagram of using a roller mold to compact the filter sleeve; Figure 4 A schematic diagram illustrating the use of roller molds to compact the filter sleeve; Figure 5 This is a schematic diagram of using an extrusion die to extrude and seal the end of a filter sleeve. Figure 6 A front view showing the end of the filter sleeve being extruded and sealed using an extrusion die; Figure 7 This is a schematic diagram showing the filter sleeve after pressure rings are installed at both ends in Example 1; Figure 8 A schematic diagram showing the extrusion and sealing of the filter sleeve with pressure ring in Embodiment 1 using an extrusion die; Figure 9 A front view of the filter sleeve with a pressure ring in Embodiment 1 being extruded and sealed using an extrusion die; Figure 10 This is a schematic diagram showing the addition of an end ring and a wire sleeve based on Embodiment 1; Figure 11 To Figure 10 A schematic diagram obtained by magnifying the end of the middle filter sleeve; Figure 12 This is a schematic diagram of the sand-proof screen pipe according to Embodiment 2 of the present invention; Figure 13 In order to be in Figure 1 A schematic diagram showing the installation of end rings and a fluid control mechanism on the corresponding sand control screen pipe; Figure 14 This is a schematic diagram of extruding and sealing the filter sleeve of Example 2 using an extrusion die; Figure 15 A front view of the filter sleeve of Example 2 being extruded and sealed using an extrusion die; Figure 16 This is a schematic diagram of the sand-proof screen pipe according to Embodiment 3 of the present invention; Figure 17 To Figure 16 A schematic diagram obtained by magnifying the end of the sand control screen pipe; Figure 18 This is a schematic diagram showing the addition of a pressure ring to the sand-proof screen tube in Example 3. Detailed Implementation

[0022] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, describes a sand-proof screen pipe, a method for processing the sand-proof screen pipe, a roller mold, and an extrusion mold.

[0023] like Figure 1 As shown, it illustrates a sand screen pipe according to an embodiment of the present invention, including a base pipe 1 and a filter sleeve 2 sleeved on the base pipe 1. The two ends of the filter sleeve 2 are mechanically squeezed and pressed onto the base pipe 1, and the two ends of the filter sleeve 2 are fixedly connected to the base pipe 1.

[0024] Specifically, the sand control screen pipe in this embodiment includes a base pipe 1 and a filter sleeve 2. The filter sleeve 2 is fitted over the base pipe 1 and is used to block sand and gravel in the formation. The base pipe 1 is generally made of tubing or casing as raw material. The pipe wall of the base pipe 1 may have several through holes, or only a few holes or no through holes, depending on different needs. In the specific processing, the filter sleeve 2 is first pressed firmly onto the base pipe 1 by mechanical extrusion, and then the two ends of the filter sleeve 2 are fixedly connected to the base pipe 1. For example, the fixed connection between the two ends of the filter sleeve 2 and the base pipe 1 is by welding.

[0025] In this embodiment, the two ends of the filter sleeve 2 are pressed firmly onto the base tube 1 by mechanical extrusion of the mold. That is, in this embodiment, the sand-proof seal between the two ends of the filter sleeve 2 and the base tube 1 is achieved by mechanical extrusion, so as to ensure that sand and gravel will not enter the interior of the filter sleeve 2 from the two ends of the filter sleeve 2.

[0026] Example 1: like Figure 1 , Figure 2As shown, the filter sleeve 2 consists of an outer protective sleeve 23, a filter layer 22, and an inner protective sleeve 21 from the outside to the inside. The filter layer 22 is an annular structure formed by at least one layer of woven metal wire mesh wrapped around the inner protective sleeve 21. The outer protective sleeve 23 and the inner protective sleeve 21 are mechanically squeezed to compact the filter layer 22.

[0027] In this embodiment, the filter layer 22 is a key sand-proof component of the sand-proof screen pipe, and it is an annular structure made of one or more layers of woven metal wire mesh. The filter layer 22 is located between the outer protective sleeve 23 and the inner protective sleeve 21. Both the outer protective sleeve 23 and the inner protective sleeve 21 have round holes or flow measurement holes for fluid flow. The outer protective sleeve 23 and the inner protective sleeve 21 are mechanically compressed to compact the filter layer 22. That is, in this embodiment, the filter layer 22 is completely unwelded. The outer protective sleeve 23 is mechanically compressed to compact the filter layer 22 tightly against the inner protective sleeve 21. Thus, this embodiment of the invention uses mechanical compaction to replace the existing welding technology, achieving the purpose of ensuring tight contact of the overlapping part of the filter layer 22 in the circumferential direction. In conjunction with the above, the two ends of the filter sleeve 2 are also mechanically compressed to tightly press the inner protective sleeve 21, the filter layer 22, and the outer protective sleeve 23 onto the base pipe 1 to ensure that sand and gravel do not enter the interior of the filter sleeve 2 from the two ends, thereby ensuring the sand-proof integrity of the filter sleeve 2. In the specific use of the sand screen tube in this embodiment, the fluid flows through the outer protective sleeve 23, the filter layer 22, the inner protective sleeve 21 and the base tube 1 into the interior of the sand screen tube.

[0028] In other words, this embodiment does not require straight seam welding along the axial direction of the overlapping part of the metal wire mesh. In conjunction with the above, the sand-proof seal between the two ends of the filter sleeve 2 and the base pipe 1 is also achieved by mechanical extrusion process. Thus, this embodiment avoids damage to the filter sleeve 2 of the sand-proof screen pipe by the welding process, ensures the mechanical properties and corrosion resistance of the sand-proof screen pipe product, and improves the production efficiency of the sand-proof screen pipe, reduces the number of parts and thus reduces the production cost.

[0029] The sand-proof screen pipe of this embodiment can be processed through the following steps: Step 1: Wrap the metal wire mesh used as the filter layer 22 around the inner protective sleeve 21, ensuring that the metal wire mesh completely wraps around the inner protective sleeve 21 at least once and forms an overlap in the circumferential direction. Then, put the outer protective sleeve 23 over the outside of the wrapped metal wire mesh to form the filter sleeve 2; Step 2: As... Figure 3 , Figure 4 As shown, the filter sleeve 2 is compressed using the roller mold 01, causing the outer protective sleeve 23 and the inner protective sleeve 21 to compact the intermediate filter layer 22, thus forming an effective sand-proof seal at the overlap of the metal wire mesh forming the filter layer 22; Step 3: The compressed filter sleeve 2 is then fitted onto the base tube 1 and axially positioned, as shown. Figure 5 , Figure 6As shown, the two ends of the filter sleeve 2 are squeezed and closed using the extrusion die 02, so that the outer protective sleeve 23, filter layer 22 and inner protective sleeve 21 at the ends of the filter sleeve 2 are tightly attached to the base tube 1, so as to ensure that an effective sand-proof seal is formed between the two ends of the filter sleeve 2 and the base tube 1, and at the same time eliminate the assembly gap between the filter sleeve 2 and the base tube 1; Step 4: The end face of the filter sleeve 2 after the end is squeezed and closed is flush, and then the end face of the filter sleeve 2 is welded and fixed to the base tube 1 to form a sand-proof screen tube.

[0030] Based on Example 1, such as Figure 7 As shown, the sand screen pipe of this embodiment also includes pressure rings 3 fitted on both sides of the filter sleeve 2. The pressure rings 3 and the filter sleeve 2 are pressed together on the base pipe 1 by mechanical extrusion. The integral formed by the pressure rings 3 and the filter sleeve 2 is fixedly connected to the base pipe 1 by welding.

[0031] In this embodiment, a pressure ring 3 is added to each side of the outer sheath of the filter sleeve 2. This pressure ring 3, together with the outer protective sleeve 23, filter layer 22, and inner protective sleeve 21 at the end, is pressed firmly onto the base tube 1. The pressure ring 3 and the filter sleeve 2 form a whole that is welded to the base tube 1 at the edge. That is, for the filter sleeve 2 in this embodiment, during specific processing, the compressed filter sleeve 2 is slipped onto the base tube 1 and axially positioned, as shown... Figure 8 , Figure 9 As shown, the compression ring 3 and the filter sleeve 2 are simultaneously compressed and closed using the extrusion die 02, so that the outer protective sleeve 23, filter layer 22 and inner protective sleeve 21 at the ends of the compression ring 3 and the filter sleeve 2 are sequentially pressed and adhered to the base tube 1 to ensure that an effective sand-proof seal is formed between the two ends of the filter sleeve 2 and the base tube 1; finally, after the end faces of the overall structure of the compression ring 3 and the filter sleeve 2 are flush, the overall structure formed by the compression ring 3 and the filter sleeve 2 is welded and fixed to the base tube 1.

[0032] Based on Example 1, such as Figure 10 , Figure 11 As shown, in this embodiment, end rings 4 are respectively provided on the inner sides of both ends of the filter sleeve 2. The two sides of the filter sleeve 2 are pressed firmly onto the corresponding end rings 4 by mechanical extrusion. The two ends of the filter sleeve 2 are welded to the corresponding end rings 4 respectively. Both end rings 4 are fixed to the base tube 1 by welding.

[0033] In this embodiment, the filter sleeve 2 includes an outer protective sleeve 23, a filter layer 22, an inner protective sleeve 21, and an end ring 4. The filter layer 22 is also located between the outer protective sleeve 23 and the inner protective sleeve 21, and the outer protective sleeve 23 and the inner protective sleeve 21 are used to compact the filter layer 22 in the middle through the roller mold 01. In this embodiment, the left end of the filter sleeve 2 obtained by the roller mold 01 covers the left end ring 4, and the right end covers the right end ring 4. The filter sleeve 2 is also squeezed and closed by the extrusion mold. In this embodiment, the filter sleeve 2 is squeezed and closed on the two end rings 4. The filter sleeve 2 is fixedly connected to the end ring 4, and the end ring 4 is fixedly connected to the base tube 1.

[0034] Based on the embodiment with end-ring configuration, such as Figure 13 As shown, the sand control screen pipe of this embodiment also includes a fluid control mechanism 6, in which an end ring 4 is fixedly connected to the fluid control mechanism by welding. Annular space gaps are provided between the end ring 4 and the base pipe 1, between the fluid control mechanism that cooperates with the end ring 4 and the base pipe 1, and between the inner protective sleeve 21 and the base pipe 1. The fluid control mechanism is fixed on the base pipe 1.

[0035] like Figure 13 As shown, the sand control screen pipe consists of a base pipe 1, a filter sleeve 2, and a fluid control mechanism 6. The filter sleeve 2 also includes an outer protective sleeve 23, a filter layer 22, and an inner protective sleeve 21 arranged sequentially from the outside to the inside. The outer protective sleeve 23, the filter layer 22, and the inner protective sleeve 21 extend to both ends to cover part of the end rings 4 at both ends. In this embodiment, the outer protective sleeve 23, the filter layer 22, and the inner protective sleeve 21 form a whole that is mechanically squeezed and pressed onto the corresponding end rings 4, and are welded and fixed to the two end rings 4 at the end faces respectively. For the two end rings 4, one end ring 4 is welded to the base pipe 1, and the other end ring 4 is welded to the fluid control mechanism 6. The fluid control mechanism is then connected to the base pipe 1 by welding, threads, or other means to form the whole sand control screen pipe.

[0036] Based on the embodiment with end-ring configuration, such as Figure 10 , Figure 11 As shown, a wire-wound sleeve 5 is also provided on the base tube 1. The wire-wound sleeve 5 is located between two end rings 4, and the outer diameter of the two end rings 4 is equivalent to the outer diameter of the wire-wound sleeve 5.

[0037] In this embodiment, the outer protective sleeve 23 and the inner protective sleeve 21 are pressed together by the roller mold 01 to compress the filter layer 22. At the end of the filter sleeve 2, the outer diameter of the end ring 4 is equivalent to the outer diameter of the winding sleeve 5. The outer protective sleeve 23, the filter layer 22, and the inner protective sleeve 21 completely cover the winding sleeve 5 in the axial length direction and continue to extend outward to cover a portion of the end ring 4 at both ends. The portion of the end ring 4 formed by the outer protective sleeve 23, the filter layer 22, and the inner protective sleeve 21 is tightly pressed onto the end ring by the extrusion mold. In this embodiment, the outer protective sleeve 23, the filter layer 22, and the inner protective sleeve 21 are welded to the end ring 4, and the end ring 4 is fixed to the base tube 1.

[0038] In this embodiment, the first two steps are the same as those in Embodiment 1; the remaining steps are as follows: Step 3: Filter sleeve 2 is threaded onto wire-wound sleeve 5. Wire-wound sleeve 5 has end rings 4 at both ends. The end of filter sleeve 2 is squeezed and closed onto end rings 4, so that the outer protective sleeve 23, filter layer 22, and inner protective sleeve 21 at the end of filter sleeve 2 are tightly fitted onto end rings 4 in sequence, ensuring that the end of the metal wire woven mesh filter layer 22 forms an effective sand-proof seal while eliminating the assembly gap between filter sleeve 2 and end rings 4; Step 4: After the end face of filter sleeve 2 is flush, it is welded to end rings 4, so that filter sleeve 2 and wire-wound sleeve 5 become an integral screen sleeve; Step 5: Base tube 1 is threaded into the integral screen sleeve, axially positioned, and then end rings 4 are welded to base tube 1 to form a sand-proof screen tube.

[0039] Each of the aforementioned embodiments includes an outer protective sleeve 23, a filter layer 22, and an inner protective sleeve 21 arranged sequentially from the outside to the inside. It should also be noted that in each of the aforementioned embodiments, the upper end of the inner protective sleeve 21 and the upper end of the outer protective sleeve 23 are flush with the upper end of the filter layer 22, and the lower end of the inner protective sleeve 21 and the lower end of the outer protective sleeve 23 are flush with the lower end of the filter layer 22.

[0040] Example 2: Based on Example 1, such as Figure 12 As shown, the sand screen pipe of this embodiment also includes two end rings 4. The upper end of the outer protective sleeve 23 is flush with the upper end of the filter layer 22, and the lower end of the outer protective sleeve 23 is flush with the lower end of the filter layer 22. The filter layer 22 and the outer protective sleeve 23 are pressed firmly onto the corresponding end rings 4 by mechanical extrusion. The two ends of the filter layer 22 and the outer protective sleeve 23 are respectively fixed to the corresponding end rings 4 by welding. The inner protective sleeve 21 is located between the two end rings 4, and the two end rings 4 are respectively fixed to the base pipe 1.

[0041] Specifically, the sand-proof screen pipe of this embodiment also includes an outer protective sleeve 23, a filter layer 22, and an inner protective sleeve 21 arranged sequentially from the outside to the inside. The filter layer 22 is also located between the outer protective sleeve 23 and the inner protective sleeve 21, and the outer protective sleeve 23 and the inner protective sleeve 21 are used to compact the filter layer 22 in the middle through the roller mold 01. It should be noted that the two ends of the outer protective sleeve 23 that makes up the filter sleeve 2 are flush with the corresponding ends of the filter layer 22, while the two ends of the inner protective sleeve 21 are located between the two ends of the filter layer 22. The sand-proof screen pipe of this embodiment also includes two end rings 4. The inner protective sleeve 21 of this embodiment is located between the two end rings 4, and the outer protective sleeve 23 and the filter layer 22 extend to both ends to a part of the end rings 4 covering both ends. The filter layer 22 and the outer protective sleeve 23 formed by this embodiment are compacted on the corresponding end rings 4 by mechanical extrusion. Figure 14 , Figure 15 As shown, the filter layer 22 and the outer protective sleeve 23 are welded and fixed to the two end rings 4 respectively, and the two end rings 4 are fixed to the base tube 1 by welding, for example.

[0042] In this embodiment, the first two steps are the same as those in Embodiment 1. The remaining steps are as follows: Step 3: Install end rings 4 on the inner sides of both ends of the filter sleeve 2. The ends of the filter sleeve 2 are squeezed and closed onto the end rings 4, so that the outer protective sleeve 23 and the filter layer 22 at the ends of the filter sleeve 2 are tightly fitted onto the end rings 4 in sequence, so as to ensure that the ends of the metal wire woven mesh filter layer 22 form an effective sand-proof seal while eliminating the assembly gap between the filter sleeve 2 and the end rings 4. Step 4: After the end face of the filter sleeve 2 is flush, weld it to the end rings 4. Step 5: Assemble the filter sleeve 2 with the end rings 4 and the base tube 1, and weld the end rings 4 at both ends of the filter sleeve 2 to the base tube 1 to form a whole, so as to form a sand-proof screen tube product.

[0043] Based on Embodiment 2, the sand control screen pipe of this embodiment also includes a fluid control mechanism 6, in which an end ring 4 is fixedly connected to the fluid control mechanism by welding. Annular space gaps are provided between the end ring 4 and the base pipe 1, between the fluid control mechanism that cooperates with the end ring 4 and the base pipe 1, and between the inner protective sleeve 21 and the base pipe 1. The fluid control mechanism is fixed on the base pipe 1.

[0044] Specifically, such as Figure 12As shown, the sand control screen pipe consists of a base pipe 1, a filter sleeve 2, and a fluid control mechanism 6. The filter sleeve 2 also includes an outer protective sleeve 23, a filter layer 22, and an inner protective sleeve 21 arranged sequentially from the outside to the inside. In this embodiment, the inner protective sleeve 21 is located between two end rings 4, while the outer protective sleeve 23 and the filter layer 22 extend to both ends to cover a portion of the end rings 4 at both ends. In this embodiment, the filter layer 22 and the outer protective sleeve 23 form a whole that is mechanically squeezed and pressed onto the corresponding end rings 4, and the whole formed by the filter layer 22 and the outer protective sleeve 23 is welded and fixed to the two end rings 4 respectively. For the two end rings 4, one end ring 4 is welded to the base pipe 1, and the other end ring 4 is welded to the fluid control mechanism 6. The fluid control mechanism 6 is then connected to the base pipe 1 by welding, threads, or other means to form the sand control screen pipe as a whole.

[0045] To reiterate, the difference between this embodiment and Embodiment Two is that in this embodiment, one of the end rings 4 is not directly welded to the base pipe 1, but is connected to the fluid control mechanism 6 (such as a screen pipe accessory). The fluid control mechanism is then connected to the base pipe 1 by welding, threading, or other methods to form a complete sand-proof screen pipe. A circumferential space must be maintained between the filter sleeve 2, the fluid control mechanism, and the base pipe 1 to meet the fluid flow requirements. For this embodiment, the first four steps are the same as those in Embodiment Two during the specific processing; the difference lies only in step five. For this embodiment, step five is as follows: assemble the filter sleeve 2 with the end ring 4 and the fluid control mechanism onto the base pipe 1, weld one end ring 4 to the base pipe 1, and weld the other end ring 4 to the fluid control mechanism. Then, connect the fluid control mechanism to the base pipe 1 by welding or threading to form the finished sand-proof screen pipe.

[0046] Example 3: like Figure 16 , Figure 17 As shown, the filter sleeve 2 in this embodiment includes an outer protective sleeve 23, a filter layer 22, a wire-wound sleeve 5, and two end rings 4. The wire-wound sleeve 5 is located between the two end rings 4, and the outer diameter of the wire-wound sleeve 5 is equivalent to the outer diameter of the two end rings 4. The filter layer 22 is an annular structure consisting of at least one layer of woven metal wire mesh wrapped around the wire-wound sleeve 5 and extending to both sides to the end rings 4 corresponding to the covered portion. The outer protective sleeve 23 is fitted over the filter layer 22. The outer protective sleeve 23 presses the filter layer 22 firmly onto the wire-wound sleeve 5 by mechanical extrusion. The portions of the outer protective sleeve 23 and the filter layer 22 covering the end rings 4 are pressed firmly onto the end rings 4 by mechanical extrusion. The outer protective sleeve 23 and the filter layer 22 are fixed to the two end rings 4 by welding. The two end rings 4 are fixed to the base tube 1 by welding.

[0047] Specifically, the sand screen pipe in this embodiment also consists of a base pipe 1 and a filter sleeve 2. The base pipe 1 uses oil pipes and casings as raw materials. The pipe wall of the base pipe 1 can have several through holes, or only a few holes or no through holes, depending on different needs. The filter sleeve 2 is used to block sand and gravel in the formation. The filter sleeve 2 consists of an outer protective sleeve 23, a filter layer 22, a wire-wound sleeve 5, and an end ring 4. The inner diameter of the end ring 4 is equivalent to the inner diameter of the winding sleeve 5, and the outer diameter of the end ring 4 is equivalent to the outer diameter of the winding sleeve 5. The outer protective sleeve 23 and the filter layer 22 completely cover the winding sleeve 5 and continue to extend to both sides to cover a portion of the end ring 4 on each side. The outer protective sleeve 23 and the filter layer 22 are tightly pressed onto the winding sleeve 5. At the end of the filter sleeve 2, the portion of the outer protective sleeve 23 and the filter layer 22 covering the end ring 4 is tightly pressed onto the end ring 4. The ends of the outer protective sleeve 23 and the filter layer 22 are kept flush and welded to the end ring 4 to form the filter sleeve 2. The end ring 4 is then welded to the base pipe 1 to form a sand screen pipe.

[0048] For this embodiment, the specific processing steps are as follows: Step 1: Use a wire-wrapped sleeve 5 with end rings 4 at both ends as an inner protective sleeve 21. Wrap the metal wire woven mesh, which serves as the filter layer 22, around the wire-wrapped sleeve 5, ensuring that the metal wire woven mesh completely wraps around the inner protective sleeve 21 at least once and overlaps. Then, put the outer protective sleeve 23 over the outside of the wrapped metal wire woven mesh to form the filter sleeve 2. Step 2: Use a roller mold 01 to squeeze the filter sleeve 2, so that the outer protective sleeve 23 and the inner protective sleeve 21 compact the filter layer 22 in the middle, so that the metal wire woven mesh forming the filter layer 22 forms at the overlap. Effective sand-proof sealing; Step 3: Using an extrusion die, the outer protective sleeve 23 and filter layer 22 are squeezed to cover the end ring 4 and close to form an end sand-proof seal. The extrusion die makes the outer protective sleeve 23 tightly adhere to the filter layer 22, and the filter layer 22 tightly adhere to the end ring 4; Step 4: After the end faces of the outer protective sleeve 23 and filter layer 22 are flush, they are welded to the end ring 4, so that the outer protective sleeve 23, filter layer 22, wire sleeve 5 and end ring 4 become an integral screen sleeve; Step 5: The base tube 1 is inserted into the integral screen sleeve, and after axial positioning, the end ring 4 is welded to the base tube 1 to form a sand-proof screen tube.

[0049] Based on Example 3, such as Figure 18 As shown, in this embodiment, the sand screen tube also includes pressure rings 3 on both sides of the outer protective sleeve 23. The pressure rings 3, the outer protective sleeve 23 and the filter layer 22 together form an integral unit and are pressed firmly onto the end ring 4 by mechanical extrusion. The pressure rings 3, the outer protective sleeve 23 and the filter layer 22 together form an integral unit and are fixedly connected to the end ring 4 by welding.

[0050] Specifically, in this embodiment, a pressure ring 3 is added to the outer side of the outer sheath at the end of the filter sleeve 2. During the specific processing, the pressure ring 3, together with the outer protective sleeve 23 and the filter layer 22 below it, are pressed together by an extrusion mold. After extrusion, the pressure ring 3 is pressed tightly against the outer protective sleeve 23, the outer protective sleeve 23 is pressed tightly against the filter layer 22, and the filter layer 22 is pressed tightly against the end ring 4.

[0051] The roller mold and extrusion mold used in the processing of the sand-proof screen pipe in this embodiment of the invention are explained as follows: When it is necessary to compress the overlapping part of the wire mesh on the circumference, taking Embodiment 1 as an example: the filter sleeve 2, which includes an outer protective sleeve 23, a filter layer 22 formed by the wire mesh, and an inner protective sleeve 21, is fed into the roller mold. Through rolling extrusion, the diameter of the outer protective sleeve 23 is slightly reduced, thus compacting the wire mesh filter layer 22. This prevents sand and gravel from entering the interior in the circumferential direction, forming an effective circumferential sand-proof seal. For the filter layer 22 formed by the wire mesh in other embodiments, it is also compacted by rolling extrusion of the roller mold.

[0052] Specifically, for the roller mold required for processing sand screen pipes, the roller mold includes at least a pair of rollers, each roller is provided with an arc surface for fitting with the outer protective sleeve of the filter sleeve. In use, by changing the size of the arc surface, the outer protective sleeve and the inner protective sleeve are mechanically squeezed to compact the filter layer.

[0053] For the roller mold, there can be one, two, or more sets, each set including one, two, or three pairs of rollers. In the case where each set includes two pairs of rollers: the first plane containing the axes of the two rollers in one pair is perpendicular to the second plane containing the axes of the two rollers in the other pair, that is, a 90-degree angle is formed between the first plane containing the axes of the two rollers in one pair and the second plane containing the axes of the two rollers in the other pair, to ensure the roundness requirement of the outer diameter of the filter sleeve 2 after extrusion. The near-circular dimension formed by the arc of each set of molds is key to controlling the outer diameter of the filter sleeve 2; changing the arc dimension of the mold changes the outer diameter of the filter sleeve 2. Again... Figure 4 For example, Figure 4The system comprises two sets of roller molds. Each set includes two molds arranged vertically and two molds arranged front-to-back. Both the front-to-back molds and the vertical molds have annular surfaces that contact the outer protective sleeve 23. The front-to-back molds and the vertical molds cooperate to form annular surfaces that contact the outer protective sleeve 23. The radii of the two annular surfaces are equal. By changing the radii of the two annular surfaces, the outer diameter of the filter sleeve 2 can be changed. When compressing the outer protective sleeve 23, one or more sets of molds with larger annular surface radii can be selected according to the current size of the outer protective sleeve 23. The radius of the corresponding annular surface of the molds is then decreased sequentially until the filter sleeve 2 with the required radius is obtained.

[0054] The extrusion die is used to make the two ends of the filter sleeve 2 fit tightly against the base tube 1 or the end ring 4 to prevent sand and gravel from entering the interior of the filter sleeve 2 from the ends, thereby forming an effective sand-proof seal at the ends.

[0055] Specifically, for the extrusion die required for processing sand screen pipes, the extrusion die includes several sector rings. After the several sector rings are spliced ​​together, they form an annular structure that can surround the filter sleeve. When in use, the amount of extrusion deformation of the two ends of the filter sleeve is adjusted by changing the minimum diameter of the inscribed circle formed by the multiple sector rings or by changing the radial stroke of the sector rings, so that the two ends of the filter sleeve are pressed firmly onto the base pipe or end ring by mechanical extrusion.

[0056] The extrusion die, for example, is a multi-lobed structure comprising multiple fan-shaped rings. These fan-shaped rings are joined together to form an annular structure that surrounds the filter sleeve 2. During use, the amount of extrusion deformation of the filter sleeve 2 is adjusted by changing the minimum diameter of the inscribed circle formed by the multiple fan-shaped rings or by changing the radial stroke of the multiple fan-shaped rings, thereby controlling the final dimension of the extrusion deformation at the end of the outer sheath. Figure 14 , Figure 15 For example, the filter sleeve 2, composed of an outer protective sleeve 23, a filter layer 22, and an inner protective sleeve 21, can be extruded onto the end ring 4 using an extrusion mold. The end ring 4 is then welded to the base pipe 1 or a screen pipe accessory to form a sand-proof screen pipe. Figure 8 , Figure 9 For example, pressure rings 3 can be added to both ends of the outer protective sleeve 23 as needed. After being squeezed and closed by the extrusion mold, the pressure rings 3 and the filter sleeve 2 below are welded together with the end ring 4 or the base tube 1 below.

[0057] This invention also provides a method for processing the aforementioned sand-control screen pipe, wherein the sand-control screen pipe includes a base pipe and a filter sleeve fitted on the base pipe. The two ends of the filter sleeve are mechanically squeezed and pressed onto the base pipe, and the two ends of the filter sleeve are fixedly connected to the base pipe. The specific processing method includes: The process yields a base tube and a filter sleeve; The filter sleeve is pressed firmly onto the base tube by extrusion using a compression mold; the compression mold is as described in the previous embodiment. Finally, fix both ends of the filter sleeve to the base tube.

[0058] This invention also provides a method for processing the aforementioned sand-control screen pipe. The sand-control screen pipe includes a base pipe and a filter sleeve fitted onto the base pipe. The two ends of the filter sleeve are mechanically compressed and pressed onto the base pipe. The two ends of the filter sleeve are fixedly connected to the base pipe. For the filter sleeve, from the outside to the inside, it consists of an outer protective sleeve, a filter layer, and an inner protective sleeve. The filter layer is a ring structure formed by at least one layer of woven metal wire mesh wrapped around the inner protective sleeve. The outer and inner protective sleeves are mechanically compressed to compact the filter layer. The specific processing method includes: The base tube is obtained through processing; The filter sleeve is obtained by pressing the outer protective sleeve with a roller mold; the roller mold is as described in the previous embodiment. The filter sleeve is pressed firmly onto the base tube by extrusion using a compression mold; the compression mold is as described in the previous embodiment. Finally, fix both ends of the filter sleeve to the base tube.

[0059] In this embodiment of the invention, the sand-proof screen pipe uses mechanical compaction with roller molds instead of welding in the prior art. This ensures that the overlapping parts of the filter layer 22 are in tight contact in the circumferential direction, thereby achieving the purpose of circumferential sand-proof sealing. The extrusion of the extrusion mold ensures that the two ends of the filter sleeve 2 are tightly attached to the base pipe 1, thereby ensuring that sand and gravel will not enter the interior of the filter sleeve 2 from the two ends, thus achieving the purpose of end sand-proof sealing. Therefore, this embodiment of the invention guarantees the sand-proof integrity of the filter sleeve 2, avoids irreversible mechanical damage to the metal wire mesh caused by welding compared with the prior art, ensures the mechanical properties and corrosion resistance of the sand-proof screen pipe product, and improves the production efficiency of the sand-proof screen pipe, reduces the number of parts, and thus reduces production costs.

[0060] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0061] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sand-proof screen pipe, comprising a base pipe and a filter sleeve fitted onto the base pipe, characterized in that, The two ends of the filter sleeve are mechanically squeezed and pressed onto the base tube, and the two ends of the filter sleeve are fixedly connected to the base tube.

2. The sand-proof screen pipe according to claim 1, characterized in that, The filter sleeve consists of an outer protective sleeve, a filter layer, and an inner protective sleeve from the outside to the inside. The filter layer is a ring structure formed by at least one layer of woven metal wire mesh wrapped around the inner protective sleeve. The outer protective sleeve and the inner protective sleeve compress the filter layer by mechanical extrusion.

3. The sand-proof screen pipe according to claim 2, characterized in that, The upper ends of the inner protective sleeve and the outer protective sleeve are flush with the upper end of the filter layer, and the lower ends of the inner protective sleeve and the outer protective sleeve are flush with the lower end of the filter layer.

4. The sand-proof screen pipe according to claim 3, characterized in that, It also includes pressure rings fitted on both sides of the filter sleeve. The pressure rings and the filter sleeve are pressed together onto the base tube by mechanical extrusion. The integral formed by the pressure rings and the filter sleeve is fixedly connected to the base tube by welding.

5. The sand-proof screen pipe according to claim 3, characterized in that, The filter sleeve has end rings on the inner sides of both ends. The two ends of the filter sleeve are pressed tightly onto the corresponding end rings by mechanical extrusion. The two ends of the filter sleeve are welded to the corresponding end rings respectively. Both end rings are fixed to the base tube by welding.

6. The sand-proof screen pipe according to claim 5, characterized in that, The base tube is also provided with a wire winding sleeve, which is located between the two end rings, and the outer diameter of the two end rings is equivalent to the outer diameter of the wire winding sleeve.

7. The sand-proof screen pipe according to claim 2, characterized in that, It also includes two end rings. The upper end of the outer protective sleeve is flush with the upper end of the filter layer, and the lower end of the outer protective sleeve is flush with the lower end of the filter layer. The two ends of the filter layer and the outer protective sleeve are mechanically squeezed and pressed onto the corresponding end rings. The two ends of the filter layer and the outer protective sleeve are respectively fixed to the corresponding end rings by welding. The inner protective sleeve is located between the two end rings, and the two end rings are respectively fixed to the base tube.

8. The sand-control screen pipe according to claim 5 or 7, characterized in that, It also includes a fluid control mechanism, wherein one of the end rings is fixedly connected to the fluid control mechanism by welding. Annular space gaps are provided between the end ring and the base pipe, between the fluid control mechanism that mates with the end ring and the base pipe, and between the inner protective sleeve and the base pipe. The fluid control mechanism is fixed to the base pipe.

9. The sand-proof screen pipe according to claim 1, characterized in that, The filter sleeve includes an outer protective sleeve, a filter layer, a wire-wound sleeve, and two end rings. The wire-wound sleeve is located between the two end rings, and the outer diameter of the wire-wound sleeve is approximately equal to the outer diameter of the two end rings. The filter layer is an annular structure consisting of at least one layer of woven metal wire mesh wrapped around the wire-wound sleeve and extending to both sides to the end rings corresponding to the covered portions. The outer protective sleeve is fitted over the filter layer. The outer protective sleeve presses the filter layer firmly onto the wire-wound sleeve by mechanical compression. The portions of the outer protective sleeve and the filter layer covering the end rings are pressed firmly onto the end rings by mechanical compression. The outer protective sleeve and the filter layer are fixed to the two end rings by welding. The two end rings are fixed to the base tube by welding.

10. The sand-proof screen pipe according to claim 9, characterized in that, It also includes pressure rings on both sides of the outer protective sleeve. The pressure rings, together with the outer protective sleeve and the filter layer, are pressed firmly onto the end ring by mechanical extrusion. The pressure rings, together with the outer protective sleeve and the filter layer, are fixedly connected to the end ring by welding.

11. An extrusion die for processing the sand-proof screen pipe as described in claim 1, characterized in that, The extrusion die includes several sector rings, which are spliced ​​together to form an annular structure that can surround the filter sleeve. In use, the amount of extrusion deformation of the two ends of the filter sleeve can be adjusted by changing the minimum diameter of the inscribed circle formed by the multiple sector rings or by changing the radial stroke of the sector rings.

12. A method for processing the sand-proof screen pipe as described in claim 1, characterized in that, include: The base tube and filter sleeve are processed; the two ends of the filter sleeve are pressed onto the base tube by extrusion through an extrusion die; the extrusion die is as described in claim 11; the two ends of the filter sleeve are respectively fixed onto the base tube.

13. A roller mold for processing the sand-proof screen pipe as described in claim 2, characterized in that, The roller mold includes at least one pair of rollers, each roller having an arc surface for fitting against the outer protective sleeve of the filter sleeve. In use, the outer protective sleeve compacts the filter layer by changing the size of the arc surface.

14. A method for processing the sand-proof screen pipe as described in claim 2, characterized in that, include: The base tube is processed; the outer protective sleeve is pressed to compact the filter layer by extrusion through a roller mold to obtain a filter sleeve; the roller mold is as described in claim 13; the two ends of the filter sleeve are pressed to compact onto the base tube by extrusion through an extrusion mold as described in claim 11; the two ends of the filter sleeve are respectively fixed onto the base tube.

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