High-permeability self-cleaning composite sand control pipe and sand control pipe column

Abstract

The utility model discloses a high-permeability self-cleaning composite sand control pipe and a sand control pipe column, which comprise a base pipe, a wire winding pipe and a slotted pipe, a liquid passing hole array is arranged on the base pipe, the wire winding pipe is provided with a wire winding section, and the slotted pipe is provided with a slotted array; the wire winding pipe is fixedly connected with the outer wall of the base pipe to form a combined body, the wire winding section covers the liquid passing hole array, the slotted pipe is fixedly connected with the outer wall of the combined body, the slotted array covers the wire winding section, and liquid passing gaps of the slotted array, the wire winding section and the liquid passing hole array are sequentially increased. Primary filtering is carried out through the slotted pipe, secondary protection is carried out through the wire winding pipe, gaps are sequentially enlarged from outside to inside, invaded stratum fine sand can be discharged, stratum sand blockage is avoided, the stratum mechanical structure is kept stable, the sand prevention validity period can be prolonged by more than one time, and the operation cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology, specifically a high-permeability self-cleaning composite sand control pipe and sand control string. Background Technology

[0002] Loose sandstone oil reservoirs are widely distributed and have large reserves. One of the main challenges in the development of these reservoirs is sand production in wells. Therefore, the research and development of sand control tools in wellbores is crucial for the successful development of loose sandstone oil reservoirs and the lifespan of sand control wells.

[0003] Currently, the main types of downhole sand control pipes in oilfields include slotted liners, wire-wound screens, and resin-filtered sand pipes. These types of sand control pipes have poor sand control effect and short service life because the gaps or pores in the sand control pipe string are easily blocked by fine sand entering the wellbore. Furthermore, the sand control pipes are easily affected by the wellbore trajectory, especially in highly deviated wells and horizontal wells, where they are easily damaged, thus affecting the sand control effect.

[0004] In response to this situation, we designed a high-permeability self-cleaning composite sand control pipe. Through a multi-layer composite design, combined with gravel filling in the formation and wellbore, a multi-level sand barrier is formed to maintain the stability of the formation's mechanical structure and extend the sand control period.

[0005] Announcement No. CN216894356U discloses a novel wire-wound screen tube. By setting a notch on the outer wall of the support rib to engage with the inner side of the wire, the radial movement of the wire is restricted by the notch, so that the gaps at all positions of the wire are uniform and consistent, thus ensuring the filtration effect of the wire.

[0006] Announcement No. CN205918408U discloses a composite filter wire-wound screen tube, which is composed of a composite wire-wound tube body and connectors at both ends. The composite wire-wound tube body includes an outer wire-wound tube, an inner wire-wound tube, and several straightening plates. The surfaces of the outer wire-wound tube and the inner wire-wound tube are respectively fastened by several sleeves. The straightening plates pass through the gap between the outer wire-wound tube and the inner wire-wound tube. The baffles at both ends of the straightening plates are respectively stuck on the outer surface of the outer wire-wound tube and the inner surface of the inner wire-wound tube.

[0007] Announcement No. CN203463086U discloses a novel composite cavity oil slotted screen pipe, comprising a central main pipe, a filter core pipe, a wire-wound screen, and an outer sheath. The central main pipe is provided with a fixing disc at its end. The filter core pipe is wrapped around the outside of the central main pipe. The wire-wound screen is wrapped around the outside of the filter core pipe, and the outer sheath is wrapped around the outside of the wire-wound screen.

[0008] All of the above-mentioned existing technologies suffer from the problem that fine sand will clog the gaps or pores after long-term use.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In view of the above-mentioned defects in the existing technology, the purpose of this utility model is to provide a high-permeability self-cleaning composite sand-proof pipe and sand-proof pipe column.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] On one hand, this utility model provides a high-permeability self-cleaning composite sand-proof pipe, including a base pipe, a wire-wound pipe, and a slotted pipe; the base pipe is provided with an array of liquid-passing holes, the wire-wound pipe is provided with a wire-wound section, and the slotted pipe is provided with a slotted array; the wire-wound pipe is fixedly connected to the outer wall of the base pipe to form an assembly, the wire-wound section covers the array of liquid-passing holes, the slotted pipe is fixedly connected to the outer wall of the assembly, and the slotted array covers the wire-wound section.

[0013] Furthermore, the lower end of the base tube is provided with a first external thread, and the upper end of the base tube is provided with a second external thread, which is connected to the upper connector;

[0014] Specifically, the first external thread and the liquid passage array form a first welded section, and the second external thread and the liquid passage array form a second welded section.

[0015] Furthermore, a first welding block is provided at the rear end of the wire winding section, and a second welding block is provided at the front end of the wire winding section. The first welding block is welded to the first welding section, and the second welding block is welded to the second welding section.

[0016] Furthermore, the rear end of the slotted tube is the first welding end, and the front end of the slotted tube is the second welding end;

[0017] Specifically, a fixed end ring is welded and installed behind the first welded block in the first welded section of the base pipe;

[0018] Specifically, the first welding end of the slit pipe is welded to the outer wall of the fixed end ring, and the second welding end of the slit pipe is welded to the outer wall of the upper connector.

[0019] Furthermore, the slits in the slit array are trapezoidal slits, with the larger end of the trapezoidal slit facing the inside of the slit tube.

[0020] Furthermore, the trapezoidal angle α of the trapezoidal slit is 10°-15°.

[0021] Furthermore, the winding section of the winding tube is made of high-strength stainless steel wire, the stainless steel wire has a trapezoidal cross-section, and after winding, it forms a trapezoidal winding gap, with the small end of the trapezoidal winding gap facing outward.

[0022] Furthermore, the liquid passage holes in the liquid passage hole array are circular holes;

[0023] Specifically, the width of the small end of the trapezoidal wire winding gap is greater than the width of the large end of the trapezoidal slit, and the diameter of the liquid passage hole is greater than the width of the large end of the trapezoidal wire winding gap.

[0024] Furthermore, the tubing material of the wound tube and the slotted tube is seamless steel pipe.

[0025] Secondly, this utility model provides a sand control oil production tubing string, including a sucker rod, the lower end of which is connected to a plunger, and a pump barrel, the outer wall of which is provided with a suspended packer. The lower end of the pump barrel is connected to a high-permeability self-cleaning composite sand control pipe as described in the first part; the lower end of the high-permeability self-cleaning composite sand control pipe is connected to a tailpipe, and the lower end of the tailpipe is connected to a plug.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This utility model uses a slotted tube for primary filtration and a wire-wound tube for secondary protection. The slots gradually increase from the outside to the inside, which can discharge intruding fine sand from the formation without causing sand blockage. It maintains the stability of the formation's mechanical structure, can increase the sand control effectiveness by more than double, and effectively reduce operating costs.

[0028] 2. In this utility model, the slit is a special trapezoidal slit, and the slit and the wire winding have self-cleaning functions. The screen sleeve has a double self-cleaning function, which can effectively prevent clogging.

[0029] 3. The entire outer diameter of this utility model is a uniform outer diameter without any steps, which can reduce resistance during later retrieval and facilitate well repair operations. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a high-permeability self-cleaning composite sand-proof pipe according to this utility model;

[0031] Figure 2 This is a schematic diagram of the base tube structure in this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the wire-winding tube in this utility model;

[0033] Figure 4 This is a schematic diagram of the slit tube in this utility model;

[0034] Figure 5 yes Figure 4Schematic diagram of the cross-sections at points A and B and the cut;

[0035] Figure 6 This is a partial structural diagram of the wire winding section in this utility model.

[0036] Figure 7 This is a schematic diagram of the structure of a sand-proof oil production tubing of this utility model.

[0037] In the diagram: 1. Upper connector;

[0038] 2. Wire-wound tube; 2.1. Wire-wound section; 2.2. First welded block; 2.3. Second welded block; 2.4. Trapezoidal wire-wound gap; 2.5. Reinforcing rib;

[0039] 3. Base tube; 3.1. Fluid passage array; 3.2. First external thread; 3.3. Second external thread; 3.4. First welded section; 3.5. Second welded section;

[0040] 4. Slitted tube; 4.1. Slit array; 4.2. First welded end; 4.3. Second welded end;

[0041] 5. Fixed end ring;

[0042] 6. Sucker rod; 7. Plunger; 8. Suspended packer; 9. Pump barrel; 10. A high-permeability self-cleaning composite sand-proof pipe; 11. Tailpipe; 12. Plug; 13. Oil layer. Detailed Implementation

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 creative efforts are within the scope of protection of the present invention.

[0044] Example 1:

[0045] Please see Figures 1 to 6 This utility model provides a high-permeability self-cleaning composite sand-proof pipe, comprising a base pipe 3, a wire-wound pipe 2, and a slotted pipe 4. The base pipe 3 is provided with a liquid-passing hole array 3.1, the wire-wound pipe 2 is provided with a wire-wound section 2.1, and the slotted pipe 4 is provided with a slotted array 4.1. The wire-wound pipe 2 is fixedly connected to the outer wall of the base pipe 3 to form an assembly. The wire-wound section 2.1 covers the liquid-passing hole array 3.1. The slotted pipe 4 is fixedly connected to the outer wall of the assembly, and the slotted array 4.1 covers the wire-wound section 2.1.

[0046] The base tube 3 is formed by drilling holes in a seamless steel pipe. The lower end of the base tube 3 is provided with a first external thread 3.2 for connection with the tubing column, and the upper end of the base tube is provided with a second external thread 3.3, which is connected to the upper connector 1 for connection with the tubing column. The first external thread 3.2 and the liquid passage array 3.1 form a first welded section 3.4, and the second external thread 3.3 and the liquid passage array 3.1 form a second welded section 3.5.

[0047] The winding section 2.1 has a first welding block 2.2 at its rear end and a second welding block 2.3 at its front end. The first welding block 2.2 is welded to the first welding section 3.4, and the second welding block 2.3 is welded to the second welding section 3.5, so that the winding section 2.1 covers the liquid passage array 3.1.

[0048] The slit tube 4 is formed by laser cutting slits on a seamless steel pipe. The rear end of the slit tube 4 is the first welding end 4.2, and the front end of the slit tube 4 is the second welding end 4.3. The first welded section 3.4 of the base tube 3 is welded with a fixed end ring 5 behind the first welded block 2.2. The first welding end 4.2 of the slit tube 4 is welded to the outer wall of the fixed end ring 5, and the second welding end 4.3 of the slit tube 4 is welded to the outer wall of the upper connector 1, so that the slit array covers the wire-wound tube 2.

[0049] Specifically, the slits in the slit array 4.1 are trapezoidal slits, with the larger end of the trapezoidal slit facing the inside of the slit tube 4. The trapezoidal angle α of the trapezoidal slit is 10°-15°, which is the included angle between the two trapezoidal sides. This can serve both as a filter and as a protector of the winding tube 2. The slit array 4.1 includes two sets of staggered slit array groups, which ensures the slit density while avoiding the impact of too many slits in the same layer on the strength of the slit tube 4.

[0050] Specifically, surface treatment of the small ends of the trapezoidal slits improves surface hardness and corrosion resistance, thereby increasing the erosion resistance of the slits.

[0051] Specifically, the winding section 2.1 of the winding tube 2 is made of high-strength stainless steel wire. The stainless steel wire has a trapezoidal cross-section with a trapezoidal angle α of 10°-15°. After winding, a trapezoidal winding gap 2.4 is formed. The larger end of the trapezoidal winding gap 2.4 faces the inside of the winding tube 2. Reinforcing ribs 2.5 are welded to the inner side of the wound stainless steel wire. The winding section 2.1 provides a second protection against the formation sand.

[0052] Specifically, the liquid passage holes in the liquid passage hole array 3.1 are circular holes.

[0053] More specifically, the smaller end width of the trapezoidal wire-winding gap 2.4 is greater than the larger end width of the trapezoidal slit, and the diameter of the liquid passage hole is greater than the larger end width of the trapezoidal wire-winding gap 2.4; the gap increases gradually from the outside to the inside, which can discharge intruding fine sand from the formation without causing formation sand blockage, maintaining the stability of the formation's mechanical structure, increasing the sand control effectiveness period by more than double, and effectively reducing operating costs.

[0054] Specifically, both the liquid passage array 3.1 and the slit array 4.1 are simulated using software to ensure a reasonable arrangement.

[0055] Specifically, the base pipe 3 and the slotted pipe 4 are made of high-strength steel. High-strength steel has 3-4 times the strength of ordinary materials, which can improve erosion resistance and increase strength during salvage.

[0056] This utility model is a multi-layer composite structure sand control pipe. The slotted and wire-wound seepage channels are designed with a trapezoidal structure, with the size gradually increasing from the outside to the inside. This structural design allows some formation silt and fine sand to enter the wellbore through the sand control pipe, thereby further improving the permeability of the near-wellbore zone. At the same time, the silt and fine sand entering the base pipe are brought to the surface with the well fluid, keeping the sand control pipe clean. Both the slotted pipe 4 and the wire-wound pipe 3 are cleaned, which is a double self-cleaning process. After a certain period of production, once the formation silt and fine sand is discharged, high conductivity production is maintained.

[0057] Example 2:

[0058] like Figure 7 As shown, this embodiment provides a sand control oil production tubing string, including a sucker rod 6, the lower end of which is connected to a plunger 7, and a pump barrel 9. A suspended packer 8 is provided on the outer wall of the pump barrel 9. The lower end of the pump barrel 9 is connected to a high-permeability self-cleaning composite sand control pipe 10 as described in Embodiment 1. The lower end of the high-permeability self-cleaning composite sand control pipe 10 is connected to a tailpipe 11, and the lower end of the tailpipe 11 is connected to a plug 12.

[0059] When in use, first lower the pump barrel 9 and its tubing string into the oil layer 13 in the well. Use the hanging packer 8 to suspend it at the perforation site of the oil layer 13, covering the oil layer 1-2m above and below. Then lower the sucker rod 6 and plunger 7 to complete the pump contact and start the oil production operation.

[0060] It should be noted that the plunger 7, pump cylinder 9, and suspension packer 8 are all existing technologies, and their structures are clear to those skilled in the art, so they will not be discussed further.

[0061] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0062] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0064] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean 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.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-permeability self-cleaning composite sand-proof pipe, comprising a base pipe, characterized in that, It also includes a wire-winding tube and a slotted tube; the base tube is provided with an array of liquid-passing holes, the wire-winding tube is provided with a wire-winding section, and the slotted tube is provided with a slotted array; The wire-wound tube is fixedly connected to the outer wall of the base tube to form an assembly. The wire-wound section covers the liquid-passing hole array. The slit tube is fixedly connected to the outer wall of the assembly. The slit array covers the wire-wound section. The gaps between the slit array, the wire winding section, and the liquid passage hole array increase sequentially.

2. The high-permeability self-cleaning composite sand-proof pipe according to claim 1, characterized in that, The lower end of the base tube is provided with a first external thread, and the upper end of the base tube is provided with a second external thread, which is connected to the upper connector; The first external thread and the liquid passage array form a first welded section, and the second external thread and the liquid passage array form a second welded section.

3. The high-permeability self-cleaning composite sand-proof pipe according to claim 2, characterized in that, A first welding block is provided at the rear end of the wire winding section, and a second welding block is provided at the front end of the wire winding section. The first welding block is welded to the first welding section, and the second welding block is welded to the second welding section.

4. The high-permeability self-cleaning composite sand-proof pipe according to claim 3, characterized in that, The rear end of the slotted tube is the first welding end, and the front end of the slotted tube is the second welding end; A fixed end ring is welded and installed behind the first weld block in the first welded section of the base pipe. The first welding end of the slotted pipe is welded to the outer wall of the fixed end ring, and the second welding end of the slotted pipe is welded to the outer wall of the upper connector.

5. A high-permeability self-cleaning composite sand-proof pipe according to any one of claims 1-4, characterized in that, The slits in the slit array are trapezoidal slits, with the larger end of the trapezoidal slit facing the inside of the slit tube.

6. The high-permeability self-cleaning composite sand-proof pipe according to claim 5, characterized in that, The trapezoidal angle α of the trapezoidal cut is 10°-15°.

7. The high-permeability self-cleaning composite sand-proof pipe according to claim 5, characterized in that, The winding section of the winding tube is made of high-strength stainless steel wire. The stainless steel wire has a trapezoidal cross-section and forms a trapezoidal winding gap after winding. The larger end of the trapezoidal winding gap faces the inside of the winding tube.

8. The high-permeability self-cleaning composite sand-proof pipe according to claim 7, characterized in that, The liquid passage holes in the liquid passage hole array are circular holes; The width of the small port of the trapezoidal wire winding gap is greater than the width of the large port of the trapezoidal slit, and the diameter of the liquid passage hole is greater than the width of the large port of the trapezoidal wire winding gap.

9. A high-permeability self-cleaning composite sand-proof pipe according to any one of claims 1-4, characterized in that, The tubing used for the wire-wound tube and the slotted tube is made of seamless steel pipe.

10. A sand-control oil production tubing string, comprising a sucker rod, the lower end of which is connected to a plunger, and a pump barrel, wherein a suspended packer is provided on the outer wall of the pump barrel, characterized in that... The lower end of the pump cylinder is connected to a high-permeability self-cleaning composite sand-proof pipe as described in claim 4; The lower end of the high-permeability self-cleaning composite sand-proof pipe is connected to a tail pipe, and the lower end of the tail pipe is connected to a plug.

Images