A sand control device for oil sand mining downhole

Abstract

The utility model relates to sand prevention device technical field, and disclose an oil sand exploitation downhole sand prevention device, including outer layer sand prevention pipe, inner layer sand prevention pipe, first opening, first sand prevention net, second opening, second sand prevention net, pipeline connecting mechanism, outlet, helical flow guide plate. Adopt this structure, can form vortex through helical flow guide plate guidance fluid, clean first sand prevention net outer surface impurity, can utilize the inflow restriction of second through -hole, make interlayer partial fluid flow out from outlet, take away second sand prevention net outer surface impurity, realize the active cleaning of first sand prevention net and second sand prevention net, significantly reduce the probability of jamming, guarantee exploitation efficiency and stable operation.

Description

Technical Field

[0001] This utility model relates to the technical field of sand control devices, specifically a sand control device for oil sand mining wells. Background Technology

[0002] Oil sands, also known as "tar sands," "heavy oil sands," or "bitumen sands," resemble black molasses in appearance, and their extraction methods differ significantly from traditional oil extraction. In oil sands extraction operations, downhole sand control is a crucial aspect of ensuring extraction efficiency. Existing technologies, such as the patent document with authorization announcement number CN 219034688 U, disclose a downhole sand control device for oil sands extraction. This device includes an outer sand control pipe, an inner sand control pipe, a first opening, a first sand control mesh, a second opening, and a second sand control mesh. The double-layer sand control pipe structure enhances the device's pressure resistance, effectively preventing damage to the sand control pipe filter material due to external extrusion pressure. However, this type of double-layer sand control structure still has significant defects during long-term use: the surfaces of the first and second sand control nets are easily adhered to and blocked by impurities in the oil sand, such as fine sand and rock fragments, which reduces the flow cross-section of the oil sand mixture and increases the flow resistance, thereby reducing mining efficiency; to restore the sand control performance, the machine needs to be stopped, the device disassembled, and the sand control nets cleaned or replaced, which not only increases maintenance costs but also seriously affects the continuity of mining operations. Utility Model Content

[0003] This utility model mainly provides a sand control device for oil sand mining, which solves the problem that the surface of the first and second sand control nets in the prior art is easily attached and blocked by impurities in the oil sand, reducing mining efficiency, requiring shutdown for cleaning or replacement, and affecting the continuity of mining operations.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A downhole sand control device for oil sands mining includes an outer sand control pipe, an inner sand control pipe, a first opening, a first sand control mesh, a second opening, and a second sand control mesh. Both ends of the inner sand control pipe are equipped with pipe connection mechanisms, and adjacent inner sand control pipes are connected through these mechanisms. The outer sand control pipe is coaxially sleeved around the inner sand control pipe, and one end of the outer sand control pipe is detachably connected to the pipe connection mechanism. The length of the outer sand control pipe is shorter than the length of the inner sand control pipe, and the unconnected end of the outer sand control pipe forms an outlet with the inner sand control pipe. A spiral guide plate is provided on the outer wall of the outer sand control pipe. The first sand control mesh is disposed within the first opening, and the second sand control mesh is disposed within the second opening. The diameter of the first opening is larger than that of the second opening. Due to the smaller diameter of the second opening, the flow rate is limited, and some fluid cannot immediately pass through the second sand-proof mesh into the inner sand-proof pipe. This creates a certain pressure in the interlayer, allowing it to flow out from the outlet more effectively. In use, during oil sands extraction operations, after the device is lowered to a preset position in the well, the fluid passes through the first sand control net, the interlayer, and the second sand control net before entering the inner sand control pipe, where it is guided and collected. During this process, the fluid flows along the outer wall of the outer sand control pipe, forming a vortex that rotates along the outer sand control pipe under the guidance of the spiral guide plate. The scouring force generated by the vortex acts on the outer surface of the first sand control net, peeling off large particles of impurities and carrying them away with the fluid, thus preventing blockage of the outer surface of the first sand control net. Subsequently, the fluid passes through the first sand control net into the interlayer between the outer and inner sand control pipes. Since some fluid cannot immediately pass through the second sand control net into the inner sand control pipe, a certain pressure is formed in the interlayer, allowing some fluid in the interlayer to be discharged from the outlet. During the flow, it carries away the fine particles of impurities attached to the outer surface of the second sand control net. Another part of the fluid passes through the second sand control net for secondary filtration before entering the inner sand control pipe, and finally is led out to the surface extraction system through the pipes connected to the inner sand control pipe. This structure allows the fluid to be guided into a vortex by the spiral guide plate, which cleans impurities from the outer surface of the first sand-proof mesh. It also allows some fluid inside the interlayer to flow out from the outlet by using the flow restriction of the second through hole, which carries away impurities from the outer surface of the second sand-proof mesh. This achieves active cleaning of the first and second sand-proof meshes, significantly reducing the probability of blockage and ensuring mining efficiency and stable operation.

[0006] Furthermore, a conical ring is provided on the inner side of the unconnected end of the outer sand-proof pipe. The conical ring has a triangular cross-section. After changing the diameter of the interlayer ring at the installation location of the conical ring, the inward flow pressure is much greater than the outward flow pressure, thus enabling the fluid to flow out stably after pressurization. This structure alters the flow-guiding area at the outlet by changing the conical ring, making the inner diameter of the interlayer ring at the installation location larger than the outer diameter, thereby increasing the outward flow force of the fluid and preventing external fluid from directly entering the interlayer from the outlet, thus preventing backflow.

[0007] Furthermore, the outer wall of the inner sand control pipe is provided with multiple reinforcing ribs, and multiple reinforcing support rods are arranged circumferentially on the reinforcing ribs. The outer ends of the reinforcing support rods abut against the inner wall of the outer sand control pipe. This structure, by providing reinforcing ribs and reinforcing support rods on the inner sand control pipe, ensures that the inner and outer sand control pipes always maintain coaxiality, avoiding pipe displacement or deformation caused by the complex downhole environment; it also disperses external extrusion pressure, extending the service life of the device.

[0008] Furthermore, a connecting screw is provided on the reinforcing ring, and one end of the reinforcing support rod has a connecting screw hole for threaded connection with the connecting screw. This structure facilitates the assembly and disassembly of the reinforcing support rod.

[0009] Furthermore, the pipeline connection mechanism includes a first-end annular plate disposed at one end of the inner sand-proof pipe, a second-end annular plate disposed at the other end of the inner sand-proof pipe, a first bolt installed on the outer end of the first-end annular plate, a connecting plate disposed on the second-end annular plate, and a second bolt. The first bolt passes through the first-end annular plate and is threadedly connected to the outer sand-proof pipe. The first-end annular plate has a groove for inserting the connecting plate. The second bolt is installed on the first-end annular plate on the side corresponding to the groove, and the second bolt passes through the first-end annular plate and is threadedly connected to the connecting plate. Threaded holes are provided on the outer sand-proof pipe and the connecting plate. In use, the outer sand-proof pipe is detachably connected to the first-end annular plate via the first bolt, and adjacent inner sand-proof pipes are threadedly connected via the second bolt after the connecting plate is inserted into the groove. This structure allows for the assembly of multiple sand-proof devices according to the required downhole mining depth, eliminating the need for custom-made ultra-long pipes, reducing transportation and processing difficulties, and adapting to different well depth scenarios.

[0010] Beneficial effects: It can guide the fluid to form a vortex through the spiral guide plate, clean the impurities on the outer surface of the first sand control net, and use the flow restriction of the second through hole to allow some of the fluid in the interlayer to flow out from the outlet, carrying away the impurities on the outer surface of the second sand control net, thereby realizing the active cleaning of the first and second sand control nets, significantly reducing the probability of blockage, and ensuring mining efficiency and stable operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the inner sand-proof pipe in this embodiment;

[0012] Figure 2 This is a schematic diagram of the outer sandproof pipe in this embodiment;

[0013] Figure 3 This is a schematic diagram of the assembly of the inner and outer sandproof pipes in this embodiment;

[0014] Figure 4 This is a schematic diagram of the tapered ring installation in this embodiment.

[0015] The attached diagram shows the following components: outer sandproof pipe 1, inner sandproof pipe 2, spiral guide plate 3, conical ring 4, reinforcing ring 5, reinforcing support rod 6, first end ring plate 7, tail end ring plate 8, first bolt 9, connecting plate 10, and second bolt 11. Detailed Implementation

[0016] The following will provide a more detailed description of the technical solution of an oil sand mining downhole sand control device related to this utility model, with reference to the embodiments.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown in this embodiment, a downhole sand control device for oil sands mining includes an outer sand control pipe 1, an inner sand control pipe 2, a first opening, a first sand control mesh, a second opening, and a second sand control mesh. Both ends of the inner sand control pipe 2 are equipped with pipe connection mechanisms, and adjacent inner sand control pipes 2 are connected through these mechanisms. The outer sand control pipe 1 is coaxially sleeved around the inner sand control pipe 2, and one end of the outer sand control pipe 1 is detachably connected to the pipe connection mechanism. The length of the outer sand control pipe 1 is shorter than the length of the inner sand control pipe 2, and the unconnected end of the outer sand control pipe 1 forms an outlet with the inner sand control pipe 2. A spiral guide plate 3 is provided on the outer wall of the outer sand control pipe 1. The first sand control mesh is disposed within the first opening, and the second sand control mesh is disposed within the second opening. The first opening has a larger diameter than the second opening. Due to the smaller diameter of the second opening, flow is limited, and some fluid cannot immediately pass through the second sand-proof mesh into the inner sand-proof pipe 2. This creates pressure within the interlayer, allowing it to flow out more effectively from the outlet. A tapered ring 4 is provided on the inner side of the unconnected end of the outer sand-proof pipe 1. Multiple reinforcing ribs 5 are provided on the outer wall of the inner sand-proof pipe 2. Multiple reinforcing support rods 6 are circumferentially distributed on the reinforcing ribs 5, with the outer ends of the reinforcing support rods 6 abutting against the inner wall of the outer sand-proof pipe 1. A connecting screw is provided on the reinforcing rib 5, and one end of the reinforcing support rod 6 has a connecting screw hole for threaded connection with the connecting screw. The pipe connection mechanism includes a first end annular plate 7 disposed at one end of the inner sand-proof pipe 2, a last end annular plate 8 disposed at the other end of the inner sand-proof pipe 2, a first bolt 9 installed on the outer end of the first end annular plate 7, a connecting plate 10 disposed on the last end annular plate 8, and a second bolt 11; the first bolt 9 passes through the first end annular plate 7 and is threadedly connected to the outer sand-proof pipe 1; the first end annular plate 7 has a groove for the connecting plate 10 to be inserted, and the second bolt 11 is installed on the first end annular plate 7 on the side corresponding to the groove, and the second bolt 11 passes through the first end annular plate 7 and is threadedly connected to the connecting plate 10.In use, during oil sands extraction operations, after the device is lowered to a preset position in the well, the fluid passes through the first sand control net, the interlayer, and the second sand control net before entering the inner sand control pipe 2, where it is guided and collected. During this process, the fluid flows along the outer wall of the outer sand control pipe 1, and under the guidance of the spiral guide plate 3, it forms a vortex that rotates along the outer sand control pipe 1. The scouring force generated by the vortex acts on the outer surface of the first sand control net, peeling off large particles of impurities and carrying them away with the fluid, thus preventing blockage of the outer surface of the first sand control net. Subsequently, the fluid passes through the first sand control net and enters the interlayer between the outer sand control pipe 1 and the inner sand control pipe 2. Since some fluid cannot immediately pass through the second sand control net into the inner sand control pipe 2, a certain pressure is formed in the interlayer, allowing some fluid in the interlayer to be discharged from the outlet. During the flow, it carries away the fine particles of impurities attached to the outer surface of the second sand control net. Another part of the fluid passes through the second sand control net for secondary filtration and then enters the inner sand control pipe 2. Finally, it is led out to the surface extraction system through the pipes connected to the inner sand control pipe 2. This structure allows the fluid to be guided into a vortex by the spiral guide plate 3, which cleans impurities on the outer surface of the first sand-proof mesh. It also allows some fluid inside the interlayer to flow out from the outlet by using the flow restriction of the second through hole, which carries away impurities on the outer surface of the second sand-proof mesh. This achieves active cleaning of the first and second sand-proof meshes, significantly reducing the probability of blockage and ensuring mining efficiency and stable operation.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A downhole sand control device for oil sands mining, comprising an outer sand control pipe, an inner sand control pipe, a first opening, a first sand control mesh, a second opening, and a second sand control mesh, characterized in that: Both ends of the inner sand-proof pipe are provided with pipe connection mechanisms, and adjacent inner sand-proof pipes are connected through the pipe connection mechanisms; the outer sand-proof pipe is coaxially sleeved outside the inner sand-proof pipe, and one end of the outer sand-proof pipe is detachably connected to the pipe connection mechanism; the length of the outer sand-proof pipe is shorter than the length of the inner sand-proof pipe, and the unconnected end of the outer sand-proof pipe forms an outlet with the inner sand-proof pipe; a spiral guide plate is provided on the outer wall of the outer sand-proof pipe.

2. The downhole sand control device for oil sands mining according to claim 1, characterized in that: A tapered ring is provided on the inner side of the unconnected end of the outer sandproof pipe.

3. The downhole sand control device for oil sands mining according to claim 1, characterized in that: The outer wall of the inner sand-proof pipe is provided with multiple reinforcing rings, and multiple reinforcing support rods are arranged in a circular pattern on the reinforcing rings. The outer ends of the reinforcing support rods abut against the inner wall of the outer sand-proof pipe.

4. The downhole sand control device for oil sands mining according to claim 3, characterized in that: A connecting screw is provided on the reinforcing ring, and a connecting screw hole is provided at one end of the reinforcing support rod for threaded connection with the connecting screw.

5. The downhole sand control device for oil sands mining according to claim 1, characterized in that: The pipe connection mechanism includes a first end annular plate disposed at one end of the inner sand-proof pipe, a last end annular plate disposed at the other end of the inner sand-proof pipe, a first bolt installed on the outer end of the first end annular plate, a connecting plate disposed on the last end annular plate, and a second bolt; the first bolt passes through the first end annular plate and is threadedly connected to the outer sand-proof pipe; the first end annular plate has a groove for the connecting plate to be inserted, and the second bolt is installed on the first end annular plate on the side corresponding to the groove, and the second bolt passes through the first end annular plate and is threadedly connected to the connecting plate.

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