Paraffin wall-hanging prevention and sand deposition prevention device and thickened oil gathering and transportation system

Abstract

The invention relates to the technical field of oil and gas transportation, and provides a paraffin wall hanging prevention and sand deposition prevention device and a thickened oil gathering and transportation system. The paraffin wall-hanging prevention and sand deposition prevention device comprises a pipeline body, a first partition piece, a second partition piece, a rotational flow generation structure and a sealing mechanism. A sand discharging hole is formed in the pipeline body; the pipeline body is divided into a rotational flow cavity, a main conveying cavity and a deposition cavity by the first separator and the second separator, the deposition cavity is communicated with the sand discharging hole, the first separator is provided with a communicating hole, and the second separator is provided with a sand leaking part; the rotational flow generating structure is used for forming rotational flow in the rotational flow cavity; the sealing mechanism is suitable for being switched between a first state for sealing the sand discharging hole and a second state for opening the sand discharging hole. According to the paraffin wall-hanging prevention and sand deposition prevention device, good paraffin wall-hanging prevention and sand deposition prevention effects can be achieved without stopping transportation, long-period stable operation of a gathering and transportation pipeline is guaranteed, the thick oil transportation efficiency of a gathering and transportation system is improved, and the advantages of being small in energy consumption and low in cost are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas transportation, and in particular to a wax wall prevention and sand deposition prevention device and a heavy oil gathering and transportation system. Background Art

[0002] Heavy oil reservoirs are widely distributed in my country, and the reserves of heavy oil far exceed those of light crude oil. The exploration and development of heavy oil is an inevitable development trend for oilfield enterprises.

[0003] The deep burial depth, high viscosity and strong corrosiveness of heavy oil have become difficulties in the development and transportation process. The wax content of crude oil in most heavy oil reservoirs is about 5%, and heavy oil reservoirs are mainly distributed in sandstone reservoirs, resulting in serious sand content in the extracted heavy oil.

[0004] During the transportation of heavy oil in the gathering and transportation pipeline, wax will be attached to the pipe wall, especially on the top of the pipe, due to the wax content, and sand will accumulate at the bottom of the pipe due to the sand content. When the wax attachment and sand accumulation accumulate to a certain extent, the pipeline diameter will be sharply reduced, the friction resistance along the heavy oil transportation will be increased, the pipeline transmission capacity will be reduced, and the pipeline pressure requirements will be increased, which will not only consume a large amount of pipeline transportation energy, but also increase the probability of pipeline accidents.

[0005] In view of the serious energy consumption and safety problems caused by wax wall adhesion and sand deposition in the gathering and transportation system, traditional methods often adopt physical cleaning and chemical cleaning methods. Among them, physical cleaning generally uses pipe cleaners, high-pressure water jets, mechanical scraping and other methods to remove impurities on the pipeline surface; chemical cleaning uses one or several chemical agents or their aqueous solutions to remove impurities on the pipeline surface. However, these methods all require stopping the transportation, consume a lot of energy, and are costly. They do not meet the goals of energy conservation and consumption reduction and carbon emission reduction, and have a great impact on oilfield production. However, methods such as increasing the pipeline temperature, mixing with thin oil for transportation, and adding demulsifiers for demulsification have little effect on solving the problems of wax wall adhesion and sand deposition.

[0006] Therefore, there is an urgent need for a safe, economical and efficient heavy oil transportation device that can suppress the accumulation of wax on the top of the pipeline and prevent sand from accumulating at the bottom of the pipeline during the heavy oil transportation process, thereby ensuring the long-term stable operation of the gathering and transportation pipeline and improving the heavy oil transportation efficiency of the gathering and transportation system. Summary of the invention

[0007] The present invention provides a wax wall prevention and sand deposition prevention device and a heavy oil gathering and transportation system, which are used to solve the problem that the existing method for solving the wax wall prevention and sand deposition in the gathering and transportation system requires stopping the transportation, consumes a lot of energy and has a high cost.

[0008] The present invention provides a device for preventing wax from sticking to the wall and preventing sand from depositing, comprising:

[0009] A pipe body, wherein a side wall of the pipe body is provided with a sand discharge hole;

[0010] A first partition and a second partition are arranged in the pipeline body, the first partition and the second partition divide the inner cavity of the pipeline body into a cyclone cavity, a main conveying cavity and a sedimentation cavity arranged radially along the pipeline body, the sedimentation cavity is connected to the sand discharge hole, the first partition is provided with a connecting hole connecting the cyclone cavity and the main conveying cavity, and the second partition is provided with a sand leakage piece connecting the main conveying cavity and the sedimentation cavity;

[0011] a swirl generating structure, disposed in the swirl chamber, for forming a swirl in the swirl chamber; and

[0012] The sealing mechanism is movably arranged outside the pipeline body, and the sealing mechanism is suitable for switching between a first state of blocking the sand discharge hole and a second state of opening the sand discharge hole.

[0013] According to a device for preventing wax from sticking to the wall and preventing sand from depositing, the present invention provides a closing mechanism comprising a closing plate, one side of which is an arc-shaped surface adapted to the outer wall of the pipe body, the closing plate being a magnetic device, the closing plate being adsorbed on the pipe body, and the closing plate being suitable for sliding along the outer wall of the pipe body to switch between the first state and the second state.

[0014] According to the device for preventing wax from sticking to the wall and preventing sand from depositing, the sealing mechanism further comprises a sealing member, and the sealing member is fixedly arranged on one side of the arc-shaped surface of the sealing plate.

[0015] According to the device for preventing wax from sticking to the wall and preventing sand from depositing, the present invention provides that the closing mechanism further comprises a handle, and the handle is fixedly connected to the closing plate.

[0016] According to a wax wall prevention and sand deposition prevention device provided by the present invention, the swirl generating structure includes a first spiral blade and a second spiral blade, and the first spiral blade and the second spiral blade are arranged on both sides of the swirl chamber opposite to each other.

[0017] According to a wax wall prevention and sand deposition prevention device provided by the present invention, a plurality of the first spiral blades and the second spiral blades are respectively arranged at intervals along the axial direction of the pipe body.

[0018] According to a device for preventing wax from sticking to the wall and preventing sand from depositing, the second partition is located on one side of the main conveying chamber and is provided with a plurality of sedimentation blocks, the plurality of sedimentation blocks are arranged at intervals along the axis of the pipeline body, and the sand leakage parts and the sedimentation blocks are arranged alternately.

[0019] According to a wax wall prevention and sand deposition prevention device provided by the present invention, the sedimentation stopper is a prism structure with a cross-sectional size gradually increasing from an end away from the second partition to an end close to the second partition.

[0020] A device for preventing wax from sticking to the wall and sand from depositing is provided according to the present invention, and further comprises:

[0021] An exhaust hole, which is arranged on the side wall of the pipeline body and communicates with the swirl chamber;

[0022] A control valve is arranged at the exhaust hole.

[0023] The present invention also provides a heavy oil gathering and transportation system, comprising the above-mentioned wax wall prevention and sand deposition prevention device.

[0024] The device for preventing wax from hanging on the wall and preventing sand from depositing has a pipeline body divided into a vortex chamber, a main conveying chamber and a deposition chamber by a first partition and a second partition. When transporting heavy oil, a vortex is formed in the upper separation chamber under the action of the vortex generating structure, which can form a vortex to flush the inner wall of the upper separation chamber to avoid wax hanging on the wall, and the deposited sand can enter the deposition chamber through the sand leakage piece. When a lot of deposited sand is deposited, the sand discharge hole can be opened by a sealing mechanism to directly discharge the deposited sand without stopping the transport. It can be seen that the present invention can achieve good effects of preventing wax from hanging on the wall and preventing sand from depositing without stopping the transport, which is beneficial to the stability of transport, ensures the long-term stable operation of the gathering and transportation pipeline, improves the heavy oil transportation efficiency of the gathering and transportation system, and has the advantages of low energy consumption and low cost.

[0025] Furthermore, since the heavy oil gathering and transportation system provided by the present invention includes a wax wall prevention and sand deposition prevention device, it also has the above advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a cross-sectional view of a device for preventing wax from sticking to the wall and preventing sand from depositing provided by the present invention;

[0028] Figure 2 This is a three-dimensional schematic diagram of the internal structure of the main conveying pipe of a wax wall prevention and sand deposition prevention device provided by the present invention (the connecting flange is hidden in the figure);

[0029] Figure 3This is an end view of the internal structure of the main conveying pipe of a wax wall prevention and sand deposition prevention device provided by the present invention (the connecting flange is hidden in the figure);

[0030] Figure 4 It is a schematic diagram of a wax wall prevention and sand deposition prevention device provided by the present invention showing the coordination structure of the sealing mechanism and the pipeline body;

[0031] Figure 5 It is a structural schematic diagram of a heavy oil transportation system provided by the present invention;

[0032] Figure markings: 1. Inlet flange; 2. Outlet flange; 3. Cyclone chamber; 4. Main conveying chamber; 5. Sedimentation chamber; 6. Cyclone generating structure; 7. First partition; 8. Exhaust hole; 9. Control valve; 10. Sedimentation stopper; 11. Second partition; 12. Sand leakage part; 13. Sand discharge hole; 14. Pipeline body; 15. Closing plate; 16. Seal; 17. Handle; 18. Well site; 19. Valve group; 20. Pump unit; 21. Starting end flow meter; 22. Pipe cleaner ball barrel; 23. Starting end pressure gauge; 24. Starting end thermometer; 25. Fluctuating section pipeline; 26. Middle section pressure gauge; 27. Middle pump unit; 28. Middle section pipeline; 29. ​​Terminal flow meter; 30. Terminal thermometer; 31. Terminal pressure gauge; 32. Pipe cleaner ball barrel; 33. Joint station. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0036] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0038] Combine the following Figures 1 to 4 The device for preventing wax from sticking to the wall and sand from depositing in an embodiment of the present invention is described, which includes a pipe body 14, a first partition 7, a second partition 11, a swirl generating structure 6 and a sealing mechanism.

[0039] The two ends of the pipeline body 14 are respectively provided with docking flanges, one of which is used as an inlet flange 1, and the other is used as an outlet flange 2. The wax wall and sand deposition prevention device can be connected to other heavy oil transportation pipelines through the docking flanges at both ends of the pipeline body 14. The side wall of the pipeline body 14 is provided with sand discharge holes 13, which are arranged along the radial direction of the pipeline body 14 and connected to the inner cavity of the pipeline body 14.

[0040] Optionally, the length of the pipeline body 14 is between 5m and 1m, for example, 5m, 8m or 10m. The length of the pipeline body 14 increases with the increase of the wax content and the sand content of the heavy oil. The corresponding relationship between the length of the pipeline body 14 and the wax content and the sand content of the heavy oil can be specifically referred to Table 1:

[0041]

[0042] Table 1

[0043] The first partition 7 and the second partition 11 are plate-like structures. The first partition 7 and the second partition 11 are arranged oppositely in the pipe body 14. The first partition 7 and the second partition 11 extend from one end of the pipe body 14 to the other end of the pipe body 14. Both sides of the first partition 7 and the second partition 11 are fixedly connected to the inner wall of the pipe body 14 respectively. The first partition 7 and the second partition 11 divide the inner cavity of the pipe body 14 into a vortex chamber 3, a main conveying chamber 4 and a sedimentation chamber 5 arranged radially along the pipe body 14. The sedimentation chamber 5 is connected to the sand discharge hole 13. The first partition 7 is provided with a connecting hole connecting the vortex chamber 3 and the main conveying chamber 4, and the second partition 11 is provided with a sand leakage piece 12 connecting the main conveying chamber 4 and the sedimentation chamber 5.

[0044] The swirl generating structure 6 is arranged in the swirl chamber 3 for forming a swirl in the swirl chamber 3. The closing mechanism is movably arranged outside the pipe body 14, and is suitable for switching between a first state of blocking the sand discharge hole 13 and a second state of opening the sand discharge hole 13.

[0045] According to the device for preventing wax from hanging on the wall and preventing sand from depositing, in the process of transporting heavy oil, the cyclone chamber 3 is located at the upper side, and the deposition chamber 5 is located at the lower side. The heavy oil enters the cyclone chamber 3, the main transport chamber 4 and the deposition chamber 5 from one end of the pipeline body 14 at the same time. The heavy oil in the cyclone chamber 3 flows in a spiral under the action of the cyclone generating structure 6. The heavy oil is thrown to the top of the pipeline body 14 and the first partition 7 by the centrifugal force, which plays a flushing role, flushing the top of the pipeline body 14 and the first partition 7, so that wax and heavy oil are not easy to hang on the wall. In this embodiment, the first partition 7 can separate the cyclone chamber 3 and the main transport chamber 4, reduce the disturbance of the spiral flow on the upper side to the flow of heavy oil in the main transport chamber 4, and reduce the loss of transport energy.

[0046] The first partition 7 is provided with a connecting hole, which can be used to allow sand to fall from the cyclone chamber 3 into the main conveying chamber 4. A plurality of connecting holes are provided, and the plurality of connecting holes are evenly spaced on the first partition. In this embodiment, the aperture of the connecting hole is between 2 mm and 13 mm, and can be specifically 2 mm, 4 mm, 8 mm or 13 mm, to accommodate different sand particle sizes. The aperture of the connecting hole can be selected based on the range of sand particle sizes in the heavy oil. The corresponding relationship between the aperture of the connecting hole of the first partition 7 and the sand particle size is shown in Table 2:

[0047]

[0048]

[0049] Table 2

[0050] In some embodiments of the present invention, the swirl generating structure 6 includes a first spiral blade and a second spiral blade, and the first spiral blade and the second spiral blade are arranged oppositely on both sides of the swirl chamber 3. The first spiral blade and the second spiral blade arranged oppositely can make the heavy oil flushed toward the upper side and the lower side respectively, so as to achieve a better flushing effect.

[0051] Optionally, a plurality of first spiral blades and a plurality of second spiral blades are arranged at intervals along the axial direction of the pipeline body 14. Further, the first spiral blades and the second spiral blades are arranged alternately. This not only achieves a good flushing effect, but also reduces the energy loss of heavy oil transportation compared to a continuously arranged spiral structure.

[0052] Optionally, the blade angles of the first spiral blade and the second spiral blade are between 25° and 75°, specifically 25°, 45° or 75°. The blade angles of the first spiral blade and the second spiral blade increase as the viscosity of the heavy oil increases.

[0053] Optionally, the distance between the first spiral blade and the second spiral blade is between 0.2 mm and 0.8 mm, specifically 0.2 mm, 0.5 mm or 0.8 mm. The distance between the first spiral blade and the second spiral blade decreases as the viscosity of the heavy oil increases.

[0054] The corresponding relationship between the blade angle and spacing of the first spiral blade and the second spiral blade and the properties of heavy oil is shown in Table 3:

[0055] category Viscosity / mPa.s Blade angle / ° Distance between each blade group / m Ordinary heavy oil 50-1000 25 0.8 Extra thick oil 10000-50000 45 0.5 Extra heavy oil >50000 75 0.2

[0056] Table 3

[0057] In some embodiments of the present invention, the wax wall and sand deposition prevention device further includes an exhaust hole 8 and a control valve 9. The exhaust hole 8 is provided on the side wall of the pipeline body 14 and communicates with the cyclone chamber 3. The control valve 9 is provided on the exhaust hole 8. The light hydrocarbons accumulated in the cyclone chamber 3 can be discharged through the exhaust hole 8. The control valve 9 can control the opening and closing of the exhaust hole 8. Optionally, the control valve 9 adopts a pressure relief valve, and can automatically relieve pressure when the internal pressure is greater than the pressure relief value.

[0058] In the embodiment of the present invention, the sand in the cyclone chamber 3 can fall into the main conveying chamber 4 through the connecting hole. Under the action of gravity, the sand continues to settle downward, and the sand carried by the heavy oil in the main conveying chamber 4 flows forward with the heavy oil in the main conveying chamber 4, gradually deposits on the second partition 11, and falls into the deposition chamber 5 through the sand leakage piece 12, which can effectively avoid the main conveying chamber 4 from being blocked by the sand deposition in the main conveying chamber 4.

[0059] Optionally, a plurality of sand leakage members 12 are arranged at intervals along the axial direction of the pipeline body 14 to ensure that the second partition 11 has good sand leakage capability at all locations along the axial direction of the pipeline body 14 .

[0060] Optionally, the sand leakage member 12 includes a cylindrical hole section and a conical hole section, wherein one end of the cylindrical hole section is connected to the main conveying chamber 4, the other end is connected to the large diameter end of the conical hole section, and the small diameter end of the conical hole section is connected to the deposition chamber 5. The cylindrical hole section of the sand leakage member 12 has a large opening, which is convenient for collecting the deposited sand, and the conical hole is a funnel-shaped structure, and its tapered angle is between 30° and 60°, which is convenient for the sand to quickly settle to the deposition chamber 5 below.

[0061] In some embodiments of the present invention, a plurality of sedimentation blocks 10 are arranged on one side of the second partition 11 connected to the main conveying chamber 4, and the plurality of sedimentation blocks 10 are arranged at intervals along the axis of the pipeline body 14, and the sand leakage pieces 12 are arranged alternately at the sedimentation blocks 10. In this embodiment, during the process of sand flowing forward with the heavy oil, due to the action of gravity, most of the sand flows in the lower part of the main conveying chamber 4, and after colliding with the sedimentation blocks 10 above the second partition 11 and slowing down, it can be quickly deposited between the sedimentation blocks 10.

[0062] Optionally, the sedimentation stopper 10 is a prism structure with a cross-sectional size gradually increasing from the end away from the second partition 11 to the end close to the second partition 11, thereby reducing the resistance of the sedimentation stopper 10 to the heavy oil, thereby reducing the energy loss during the transportation of the heavy oil. The inclined structure formed by the sedimentation stopper 10 can increase the width of the sand falling channel formed between the sedimentation stops 10, and can guide the sand, so as to facilitate the collection of sand and facilitate the sand to slide toward the sand leakage piece 12.

[0063] Combination Figure 4In some embodiments of the present invention, the closing mechanism includes a closing plate 15, one side of which is an arc-shaped surface adapted to the outer wall of the pipeline body 14, and the closing plate 15 is a magnetic device. The closing plate 15 is adsorbed on the pipeline body 14, and the closing plate 15 is suitable for sliding along the outer wall of the pipeline body 14 to switch between the first state and the second state. In this embodiment, the closing plate 15 can be an arc-shaped plate structure. When the closing plate 15 is adsorbed on the pipeline body 14, one side of the arc-shaped surface of the closing plate 15 is in contact with the pipeline body 14. When the closing mechanism is in the first state, the closing plate 15 covers the sand discharge hole 13 and blocks the sand discharge hole 13. By sliding the closing plate 15, the closing mechanism is switched to the second state. At this time, the sand discharge hole 13 is no longer blocked by the closing plate 15, and the sand in the sedimentation chamber 5 can be discharged through the sand discharge hole 13. It is worth noting that in the process of discharging the sand in the sedimentation chamber 5, since the sand is accumulated in the sedimentation chamber 5, only a small amount of heavy oil is discharged with the sand, and this process can be completed without stopping the transportation.

[0064] Optionally, the closing mechanism further includes a handle 17, and the handle 17 is fixedly connected to the closing plate 15. In this embodiment, the shape of the handle 17 is not specifically limited, for example, it can be a block structure of any shape such as a rectangle, a square or a trapezoid, or it can be an "n"-shaped frame structure. The handle 17 is fixedly connected to the closing plate 15 by welding or is integrally formed with the closing plate 15, so that it has good connection strength. The provision of the handle 17 can make it easier for the closing plate 15 to slide.

[0065] Optionally, the handle 17 is located at one end of the closing plate 15 in the circumferential direction, and the closing plate 15 can be rotated by a certain angle along the circumferential direction of the pipe body through the handle 17 to switch the state of the closing mechanism.

[0066] Optionally, the closing mechanism further includes a seal 16, which is fixedly disposed on one side of the curved surface of the closing plate 15. The seal 16 may be an annular gasket that matches the edge of the curved surface of the closing plate 15, or may be a gasket that matches the entire curved surface of the closing plate 15, which is not specifically limited here.

[0067] The above solution only exemplarily introduces an optional form of the closing mechanism. In some other forms, the closing plate 15 in the closing mechanism can also be connected to the pipe body 14 by means of snap connection or hinge connection.

[0068] Taking the hinged form as an example, one side of the closing plate 15 is hinged to the pipe body 14, and the other side is detachably fixed by a structure such as a latch, and the closing mechanism can be switched between the first state and the second state by rotating the closing plate 15. Furthermore, an elastic protrusion corresponding to the sand discharge hole 13 is provided on the side of the closing plate 15 that contacts the pipe body 14. When the closing plate 15 contacts and cooperates with the pipe body 14, the elastic protrusion is inserted into the sand discharge hole 13, which has a better sealing effect on the sand discharge hole 13.

[0069] like Figure 5 As shown, an embodiment of the present invention further provides a heavy oil gathering and transportation system, comprising the above-mentioned wax wall prevention and sand deposition prevention device.

[0070] Optionally, the heavy oil transportation system further comprises a well site 18, a valve group 19, a pump unit 20, a starting end flow meter 21, an undulating section pipeline 25, an intermediate pump unit 27, an intermediate section pipeline 28, a terminal flow meter 29 and a joint station 33, which are sequentially connected by pipelines, wherein at least one of the undulating section pipeline 25 and the intermediate section pipeline 28 is provided with a wax wall prevention and sand deposition prevention device. Preferably, the undulating section pipeline 25 and the intermediate section pipeline 28 are respectively provided with at least one wax wall prevention and sand deposition prevention device.

[0071] Optionally, the heavy oil transportation system further includes a starting end pressure gauge 23 , a starting end thermometer 24 , a middle section pressure gauge 26 , a terminal thermometer 30 and a terminal pressure gauge 31 .

[0072] Optionally, the heavy oil transportation system further comprises a pig launching barrel 22 and a pig receiving barrel 32, wherein the pig launching barrel 22 is located upstream of the gathering and transportation system, and the pig receiving barrel 32 is located downstream of the gathering and transportation system.

[0073] It is worth noting that the anti-wax wall and anti-sand deposition device can be used at all pipeline positions of the heavy oil transportation system. Preferably, the anti-wax wall and anti-sand deposition device is connected to the area of ​​the system prone to wax wall and sand deposition through a docking flange, so as to achieve good anti-wax wall and anti-sand deposition effects while reducing the cost of use.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preventing wax from sticking to the wall and sand from depositing, characterized in that: include: A pipe body, wherein a side wall of the pipe body is provided with a sand discharge hole; A first partition and a second partition are arranged in the pipeline body, the first partition and the second partition divide the inner cavity of the pipeline body into a cyclone cavity, a main conveying cavity and a sedimentation cavity arranged radially along the pipeline body, the sedimentation cavity is connected to the sand discharge hole, the first partition is provided with a connecting hole connecting the cyclone cavity and the main conveying cavity, and the second partition is provided with a sand leakage piece connecting the main conveying cavity and the sedimentation cavity; A swirl generating structure, disposed in the swirl chamber, for forming a swirl in the swirl chamber; as well as The sealing mechanism is movably arranged outside the pipeline body, and the sealing mechanism is suitable for switching between a first state of blocking the sand discharge hole and a second state of opening the sand discharge hole.

2. The device for preventing wax from sticking to the wall and sand from depositing according to claim 1, characterized in that: The closing mechanism includes a closing plate, one side of which is an arc-shaped surface adapted to the outer wall of the pipe body, the closing plate is a magnetic device, the closing plate is adsorbed on the pipe body, and the closing plate is suitable for sliding along the outer wall of the pipe body to switch between the first state and the second state.

3. The device for preventing wax from sticking to the wall and sand from depositing according to claim 2, characterized in that: The sealing mechanism further comprises a sealing member, and the sealing member is fixedly arranged on one side of the arc-shaped surface of the sealing plate.

4. The device for preventing wax from sticking to the wall and sand from depositing according to claim 2 or 3, characterized in that: The closing mechanism further comprises a handle, and the handle is fixedly connected to the closing plate.

5. The device for preventing wax from sticking to the wall and sand from depositing according to claim 1, characterized in that: The swirl generating structure comprises a first spiral blade and a second spiral blade, wherein the first spiral blade and the second spiral blade are arranged opposite to each other on two sides of the swirl chamber.

6. The device for preventing wax from sticking to the wall and sand from depositing according to claim 5, characterized in that: A plurality of the first spiral blades and the second spiral blades are respectively arranged at intervals along the axial direction of the pipe body.

7. The device for preventing wax from sticking to the wall and sand from depositing according to claim 1, characterized in that: The second partition is located at one side of the main conveying cavity and is provided with a plurality of settlement blocks, the plurality of settlement blocks are arranged at intervals along the axis of the pipeline body, and the sand leakage pieces and the settlement blocks are alternately arranged.

8. The device for preventing wax from sticking to the wall and sand from depositing according to claim 7, characterized in that: The subsidence stopper is a prism structure with a cross-sectional size gradually increasing from an end away from the second partition to an end close to the second partition.

9. The device for preventing wax from sticking to the wall and sand from depositing according to claim 1, characterized in that: Also includes: An exhaust hole, which is arranged on the side wall of the pipeline body and communicates with the swirl chamber; A control valve is arranged at the exhaust hole.

10. A heavy oil gathering and transportation system, characterized in that: It comprises the device for preventing wax from sticking to the wall and preventing sand from depositing as described in any one of claims 1 to 9.

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