Self-pumping two-stage tandem desander

Abstract

The invention provides a self-pumping two-stage tandem desander, which comprises a first-stage desanding device, a second-stage desanding device, a third-stage desanding device, a third-stage desanding device, a fourth-stage desanding device, a fourth-stage desanding device and a fourth-stage desanding device, the second-stage desanding equipment comprises a second-stage separator, the second-stage separator is used for being connected with the air outlet pipe, and the second-stage separator is communicated with the first-stage separator through a connecting pipeline; the self-pumping equipment comprises a first-stage pumping device, a pumping connecting pipe and a second-stage pumping device which are connected in sequence, the first-stage pumping device is arranged in the first-stage separator, the second-stage pumping device is arranged in the second-stage separator, and the self-pumping equipment is used for pumping out accumulated water in the first-stage separator and the second-stage separator. The sand remover solves the problem that in the prior art, accumulated water in the sand remover is difficult to remove.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas desanding, and in particular to a self-pumping two-stage series desander. Background Art

[0002] Natural gas is an important combustible clean energy source hidden in the strata. During natural gas extraction, the raw gas directly extracted from the gas well often contains a small amount of sand and gravel. In particular, in recent years, in order to increase production, a large number of fracturing operations have been used. Some of the proppant sand and gravel carried in the fracturing fluid will also be carried to the wellhead along with the extracted natural gas. If the sand and gravel are not removed, the sand and gravel will erode the pipeline and even block the pipeline, which will seriously affect the service life of the gas transmission system. Therefore, desanders are generally required in gas fields for desandering. Desanders in the prior art generally use the effect of gravity separation, that is, the sand and gravel are retained in the sand accumulation cylinder at the bottom, and the natural gas continues to flow in the upper part.

[0003] Since natural gas extraction has its own characteristics, first of all, natural gas, like crude oil, is often a storage system with bottom water or edge water. Along with the natural gas extraction process, the elastic energy of the water body will drive water into the gas reservoir along the high permeability zone, and will be carried out of the wellhead together with the natural gas. The natural gas extracted from the well contains water droplets or water vapor, which are easy to condense and remain in the desander during the desander process. Once too much accumulation in the desander, it will block the pipeline and make the removed gravel adhere to the equipment, which is difficult to remove, causing trouble for the normal operation of the desander, and even blocking the desander. However, the desander itself is a high-pressure mechanism. Once disassembled and installed, it will have a greater impact on the sealing, and greatly consume labor, and cause the desandering work to be suspended, which is not easy to use in the actual natural gas purification process. The existing technology cannot well combine the removal of moisture in the desander and the maintenance process while maintaining the pressure stability of the equipment.

[0004] That is to say, the desander in the prior art has the problem of difficulty in removing the accumulated water inside. Summary of the invention

[0005] The main purpose of the present invention is to provide a self-pumping two-stage series desander to solve the problem of difficulty in removing the accumulated water inside the desander in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a fully enclosed self-pumping two-stage serial desander, comprising: a first-stage desander device, the first-stage desander device comprises a first-stage separator, the first-stage separator is used to be connected to an air inlet pipe; a second-stage desander device, the second-stage desander device comprises a second-stage separator, the second-stage separator is used to be connected to an air outlet pipe, and the second-stage separator is connected to the first-stage separator through a connecting pipeline; a self-pumping device, the self-pumping device comprises a first-stage pumping device, a pumping connecting pipe and a second-stage pumping device connected in sequence, the first-stage pumping device is arranged in the first-stage separator, the second-stage pumping device is arranged in the second-stage separator, and the self-pumping device is used to pump out the accumulated water in the first-stage separator and the second-stage separator.

[0007] Furthermore, the secondary separator is provided with a secondary separation chamber and an outlet pipeline connected to the air outlet pipe, and a secondary water pumping device is arranged in the secondary separation chamber. The secondary water pumping device includes: an air pumping mechanism, which is connected to the outlet pipeline and is used to generate negative pressure suction; a secondary water pumping pipe, which is connected to the air pumping mechanism so that the secondary water pumping pipe can pump out water while the air pumping mechanism generates negative pressure suction.

[0008] Furthermore, the exhaust mechanism includes: an exhaust pipe section, which is coaxially connected to the outlet pipeline and can generate negative pressure suction; a docking assembly, at least a portion of which is connected to an end of the exhaust pipe section away from the outlet pipeline; an inlet pipeline, one end of the inlet pipeline is connected to the docking assembly, and the inlet pipeline has at least one bending portion, which is used to change the extension direction of the inlet pipeline so that the pipe opening at the other end of the inlet pipeline is set toward the bottom of the secondary separator.

[0009] Furthermore, the exhaust pipe section includes the following connected in sequence: a butt pipe section, which is connected to the butt assembly; a reduced diameter pipe section, whose diameter is gradually reduced in the direction away from the butt pipe section; a throat section, whose pipe wall is connected to the secondary water pumping pipe and the water pumping connecting pipe; and a diffuser section, whose diameter is gradually expanded in the direction away from the throat section, and which is connected to the outlet pipeline.

[0010] Furthermore, the docking assembly includes: an air pipe, which is coaxially connected to the air extraction pipe section; a blocking pipe section, which is coaxially sleeved outside the air pipe, and the blocking pipe section and the air pipe are spaced to form a clearance gap so that at least a portion of the inlet pipeline extends into the clearance gap.

[0011] Furthermore, a plurality of threaded holes are arranged at intervals on the plugging pipe section, and the threaded holes penetrate the pipe wall of the plugging pipe section. The docking assembly also includes a plurality of locking bolts, and the locking bolts pass through the threaded holes and abut against the inlet pipeline.

[0012] Furthermore, the inlet pipeline is threadedly connected to the air pipe and the blocking pipe section, and one end of the inlet pipeline extending into the clearance interval has a convex ring, which is arranged corresponding to the position of the threaded hole so that the locking bolt abuts against the convex ring.

[0013] Furthermore, the secondary pumping device also includes a mounting bracket, which is used to fix the inlet pipeline, and at least a portion of the mounting bracket is arranged near the bottom of the secondary separation chamber relative to the pipe opening of the inlet pipeline.

[0014] Furthermore, one end of the secondary water pumping pipe away from the air pumping mechanism extends toward the bottom of the secondary separation chamber, a conical section is provided at the bottom of the secondary separation chamber, and at least a portion of the secondary water pumping pipe is arranged in close contact with the wall surface of the conical section.

[0015] Furthermore, the first-level separator is provided with a first-level separation chamber and an inlet pipeline connected to the air inlet pipe, and a first-level pumping device is arranged in the first-level separation chamber, and the first-level pumping device includes: a sand retaining plate, which is arranged opposite to the inlet pipeline, and at least a portion of the sand retaining plate extends toward the bottom of the first-level separation chamber; a first-level pumping pipe, which is arranged on a side of the sand retaining plate away from the inlet pipeline, and at least a portion of the first-level pumping pipe extends toward the bottom of the first-level separation chamber, and at least another portion of the first-level pumping pipe is connected to the pumping connecting pipe.

[0016] Furthermore, the sand retaining plate includes an inclined section and a vertical section connected to each other, the inclined section is inclined in a direction away from the inlet pipeline, the vertical section extends toward the bottom of the primary separation chamber, and the bottom end of the vertical section is close to the bottom of the primary separation chamber relative to the connecting pipeline.

[0017] Furthermore, a sand retaining piece is provided at one end of the primary water pumping pipe close to the bottom of the primary separation chamber, and the sand retaining piece is spaced apart from the pipe opening of the primary water pumping pipe.

[0018] Furthermore, the sand retaining member is an umbrella-shaped structure, and the apex of the umbrella-shaped structure is detachably arranged on the primary water pumping pipe.

[0019] Furthermore, the sand retaining member is a cylindrical structure, the top surface of the cylindrical structure is detachably arranged on the primary water pumping pipe, and the bottom surface of the cylindrical structure is opened.

[0020] Furthermore, a plurality of water inlet holes are arranged on one side of the primary water pumping pipe away from the sand retaining plate, and the water inlet holes are arranged at a position of the primary water pumping pipe relative to the sand retaining piece close to the bottom of the primary separation chamber.

[0021] Furthermore, the central axis of the connecting pipeline is parallel to the central axis of the inlet pipeline and is staggered. The connecting pipeline is arranged near the bottom of the first-stage separator relative to the inlet pipeline. The second-stage separator has an outlet pipeline connected to the air outlet pipe, and the central axis of the outlet pipeline is on the same straight line as the central axis of the inlet pipeline.

[0022] Furthermore, the self-pumping equipment also includes a switching fixing ring, which is arranged at one end of the connecting pipeline connected to the secondary separator, and the switching fixing ring divides the water pumping connecting pipe into two sections.

[0023] Furthermore, there are multiple first-level water pumping pipes, and the water pumping connecting pipes are arranged in a one-to-one correspondence with the first-level water pumping pipes.

[0024] By applying the technical solution of the present invention, when the fully enclosed self-pumping two-stage series desander of the present application is in use, natural gas rushes into the first-stage desander with sand and water. After being blocked by the sand retaining plate, most of the sand falls downward and falls into the first-stage sand accumulation tube, and some water is also retained inside. At this time, the natural gas enters the second-stage desander with the remaining water and sand from the connecting pipeline, and some sand and water are also allowed to fall inside the second-stage desander. At this time, the gas enters the air pipe from the inlet pipeline and reaches the air extraction pipe section. At this time, the gas has a reduced flow area and a faster flow rate, forming a vacuum area on the side and driving the gas in the second-stage water extraction pipe and the water extraction connecting pipe to be extracted. At this time, if the height of the accumulated water in the first-stage separation chamber or the second-stage separation chamber reaches a level that can overflow all the water inlet holes at the bottom of the first-stage water extraction pipe or the second-stage water extraction pipe, the internal air is extracted and the air pressure is reduced. The external air pressure will press the accumulated water into the first-stage water extraction pipe or the second-stage water extraction pipe, so that the water is extracted and sent to the next process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A schematic diagram showing an angle of a self-pumping two-stage series desander according to Embodiment 1 of the present invention;

[0027] Figure 2 Shows Figure 1 A cross-sectional view of part A in FIG.

[0028] Figure 3 Shows Figure 2 An enlarged schematic diagram of part B in FIG.

[0029] Figure 4 Shows Figure 3 An enlarged schematic diagram of part C in FIG.

[0030] Figure 5 Shows Figure 2 A schematic diagram of the connection between the primary water pumping pipe and the water pumping connecting pipe at an angle;

[0031] Figure 6 Shows Figure 5 A schematic diagram of the connection between the primary water pumping pipe and the water pumping connecting pipe from another angle;

[0032] Figure 7 Shows Figure 6 An enlarged schematic diagram of part D in FIG.

[0033] Figure 8 Shows Figure 2 A schematic diagram of an angle of the exhaust pipe section in FIG.

[0034] Fig. 9 Shows Figure 2 An enlarged schematic diagram of part E in FIG.

[0035] The above drawings include the following reference numerals:

[0036] 10. First-stage sand removal equipment; 11. First-stage separator; 111. First-stage separation chamber; 112. Inlet pipeline; 12. First-stage gas sand cut-off valve; 13. First-stage sand accumulation cylinder; 20. Second-stage sand removal equipment; 21. Second-stage separator; 211. Second-stage separation chamber; 212. Outlet pipeline; 213. Conical section; 22. Second-stage gas sand cut-off valve; 23. Second-stage sand accumulation cylinder; 30. Self-pumping equipment; 31. First-stage pumping device; 311. Sand retaining plate; 312. First-stage pumping pipe; 313. Inclined section; 314. Vertical section; 315. Sand retaining piece ; 316, water inlet hole; 32, water pumping connecting pipe; 321, adapter; 33, secondary water pumping device; 34, air pumping mechanism; 35, secondary water pumping pipe; 36, air pumping pipe section; 361, butt joint section; 362, reduced diameter pipe section; 363, throat section; 364, diffuser section; 37, butt joint assembly; 371, air pipe; 372, sealing pipe section; 373, threaded hole; 374, locking bolt; 38, inlet pipeline; 381, bending part; 382, ​​convex ring; 39, mounting bracket; 40, connecting pipeline; 41, adapter fixing ring. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0039] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0040] In order to solve the problem of difficulty in removing the accumulated water inside the desander in the prior art, the present invention provides a self-pumping two-stage series desander.

[0041] like Figures 1 to 9 As shown, the fully enclosed self-pumping two-stage serial desander includes a first-stage desander device 10, a second-stage desander device 20 and a self-pumping device 30. The first-stage desander device 10 includes a first-stage separator 11, and the first-stage separator 11 is used to be connected to the air inlet pipe; the second-stage desander device 20 includes a second-stage separator 21, and the second-stage separator 21 is used to be connected to the air outlet pipe, and the second-stage separator 21 is connected to the first-stage separator 11 through a connecting pipeline 40; the self-pumping device 30 includes a first-stage pumping device 31, a pumping connecting pipe 32 and a second-stage pumping device 33 connected in sequence, the first-stage pumping device 31 is arranged in the first-stage separator 11, and the second-stage pumping device 33 is arranged in the second-stage separator 21, and the self-pumping device 30 is used to pump out the accumulated water in the first-stage separator 11 and the second-stage separator 21.

[0042] By arranging the primary pumping device 31 in the primary separator 11, the accumulated water in the primary separator 11 can be pumped out by the primary pumping device 31 and sent to the secondary pumping device 33 through the pumping connection pipe 32. By arranging the secondary pumping device 33 in the secondary separator 21, the accumulated water in the secondary separator 21 can be pumped out by the secondary pumping device 33. At the same time, since the secondary separator 21 is connected with the primary separator 11 through the connecting pipeline 40, the pumping work can be realized while ensuring the gas desanding process, without the need for external equipment, and the internal pressure of the desander will not be damaged, and the automatic pumping work can be completed inside the desander.

[0043] It should be noted that the fully enclosed self-pumping two-stage series desander of the present application can realize the self-pumping function inside the desander, but cannot dry the gas. That is to say, when the gas enters the fully enclosed self-pumping two-stage series desander of the present application, the desandering effect can be achieved, and the moisture in the gas is only temporarily separated and accumulated in the desander. As the self-pumping proceeds, the accumulated water inside the desander will eventually merge with the desandered gas and enter the gas outlet pipe.

[0044] like Figure 3As shown, the secondary separator 21 has a secondary separation chamber 211 and an outlet pipeline 212 connected to the air outlet pipe, and a secondary pumping device 33 is arranged in the secondary separation chamber 211. The secondary pumping device 33 includes a suction mechanism 34 and a secondary pumping pipe 35. The suction mechanism 34 is connected to the outlet pipeline 212, and the suction mechanism 34 is used to generate negative pressure suction. The secondary pumping pipe 35 is connected to the suction mechanism 34, so that the secondary pumping pipe 35 pumps out water while the suction mechanism 34 generates negative pressure suction. By arranging the secondary pumping device 33 in the secondary separation chamber 211, the suction mechanism 34 guides the gas to flow toward the outlet pipeline 212, and the secondary separation chamber 211 can remove sand from the gas. At the same time, by utilizing the effect of negative pressure suction generated by the suction mechanism 34, the air pressure in the secondary separation chamber 211 is higher than the air pressure in the suction mechanism 34, and the secondary pumping pipe 35 is connected to the suction mechanism 34, so that the accumulated water in the secondary separation chamber 211 is pressed into the secondary pumping pipe 35.

[0045] like Figure 4 As shown, the exhaust mechanism 34 includes an exhaust pipe section 36, a docking assembly 37 and an inlet pipeline 38. The exhaust pipe section 36 is coaxially connected to the outlet pipeline 212, and the exhaust pipe section 36 can generate negative pressure suction; at least a portion of the docking assembly 37 is connected to one end of the exhaust pipe section 36 away from the outlet pipeline 212; one end of the inlet pipeline 38 is connected to the docking assembly 37, and the inlet pipeline 38 has at least one bending portion 381, and the bending portion 381 is used to change the extension direction of the inlet pipeline 38 so that the pipe mouth at the other end of the inlet pipeline 38 is set toward the bottom of the secondary separator 21. By setting up the suction pipe section 36 for negative pressure suction, it can be ensured that the gas flows in the direction of the outlet pipeline 212. At the same time, the suction pipe section 36 and the inlet pipeline 38 are connected by the docking assembly 37, so that the suction mechanism 34 is installed in the secondary separation chamber 211. The pipe mouth of the inlet pipeline 38 is set toward the bottom of the secondary separator 21. After the gas enters the secondary separation chamber 211, the mixed sand and gravel can fall fully under the action of gravity, and the gas then enters the inlet pipeline 38. It can also prevent the sand and gravel from being sucked into the inlet pipeline 38 together, thereby ensuring gas circulation and sand removal effects.

[0046] like Figure 7 and Figure 8As shown, the exhaust pipe section 36 includes a butt joint pipe section 361, a reduced diameter pipe section 362, a throat section 363 and a diffuser section 364 which are connected in sequence, the butt joint pipe section 361 is connected to the docking assembly 37; the diameter of the reduced diameter pipe section 362 is gradually reduced in the direction away from the butt joint pipe section 361; the pipe wall of the throat section 363 is connected to the secondary water extraction pipe 35 and the water extraction connecting pipe 32; the diameter of the diffuser section 364 is gradually expanded in the direction away from the throat section 363, and the diffuser section 364 is connected to the outlet pipeline 212. By setting up the reduced diameter pipe section 362, the throat section 363 and the diffuser section 364 which are connected in sequence, the diameters of the reduced diameter pipe section 362 and the diffuser section 364 are gradually increased in the direction away from the throat section 363, and the flow velocity of the gas is greatly increased in the process of passing through a structure from wide to narrow and then to wide, wherein the reduced diameter pipe section 362 accelerates the gas convergence, the throat section 363 allows the gas to flow at high speed and generate negative pressure inhalation, the diffuser section 364 diffuses the gas and relatively slows down, and the throat section 363 is connected to the secondary water pumping pipe 35. Since the air pressure in the secondary separation chamber 211 is higher than the air pressure in the throat section 363, the gas in the secondary separation chamber 211 will press the accumulated water into the secondary water pumping pipe 35, and then the accumulated water and the gas will merge in the throat section 363, thereby achieving the function of clearing the accumulated water in the secondary separation chamber 211. Similarly, by connecting the pumping connection pipe 32 with the throat section 363, the accumulated water in the first separator 11 extracted by the first pumping device 31 can be sent to the throat section 363 to merge with the gas, so as to clean the accumulated water inside the desander. It should be noted that since the flow rate of the gas and the accumulated water is greatly increased after passing through the diffusion pipe section 364, they can flow smoothly into the outlet pipeline 212. At the same time, under the action of the higher air pressure in the first separator 11 and the second separation chamber 211, the problem of accumulated water backflow will not occur. The active discharge of the accumulated water inside the desander is achieved by using the air pumping pipe section 36.

[0047] like Figure 4 As shown, the docking assembly 37 includes an air pipe 371 and a blocking pipe section 372. The air pipe 371 is coaxially connected to the air extraction pipe section 36. The blocking pipe section 372 is coaxially sleeved outside the air pipe 371. The blocking pipe section 372 and the air pipe 371 are spaced apart to form a clearance gap, so that at least a portion of the inlet pipeline 38 can extend into the clearance gap. By forming a clearance gap between the air pipe 371 and the blocking pipe section 372, the inlet pipeline 38 can be extended into the clearance gap. The blocking pipe section 372 is sleeved outside to ensure the sealing connection effect between the inlet pipeline 38 and the air pipe 371, and it is also convenient for disassembly and installation.

[0048] like Figure 4As shown, a plurality of threaded holes 373 are arranged at intervals on the plugging pipe section 372, and the threaded holes 373 penetrate the pipe wall of the plugging pipe section 372. The docking assembly 37 also includes a plurality of locking bolts 374, and the locking bolts 374 pass through the threaded holes 373 and abut against the inlet pipeline 38. The locking bolts 374 fasten the plugging pipe section 372 and the inlet pipeline 38, so as to ensure a sealed connection effect.

[0049] like Figure 4 As shown, the inlet pipeline 38 is threadedly connected with the air pipe 371 and the blocking pipe section 372. The end of the inlet pipeline 38 extending into the clearance interval has a convex ring 382, ​​and the convex ring 382 is arranged corresponding to the position of the threaded hole 373, so that the locking bolt 374 abuts against the convex ring 382. The locking bolt 374 abuts against the convex ring 382 to prevent the locking bolt 374 from damaging the threads on the inlet pipeline 38, thereby ensuring the stability of the connection between the inlet pipeline 38, the air pipe 371 and the blocking pipe section 372.

[0050] like Figure 3 As shown, the secondary pumping device 33 further includes a mounting bracket 39, which is used to fix the inlet pipeline 38, and at least a portion of the mounting bracket 39 is arranged near the bottom of the secondary separation chamber 211 relative to the pipe opening of the inlet pipeline 38. In other words, the mounting bracket 39 can ensure the stability of the inlet pipeline 38, and can also block gravel between the inlet pipeline 38 and the secondary pumping pipe 35, which is conducive to the sliding of gravel, improving the sand removal effect, and is also conducive to the gathering of gas to the pipe opening of the inlet pipeline 38, which is conducive to the gas circulation.

[0051] like Figure 3 As shown, one end of the secondary water extraction pipe 35 away from the air extraction mechanism 34 extends to the bottom of the secondary separation chamber 211, and a conical section 213 is provided at the bottom of the secondary separation chamber 211, and at least a portion of the secondary water extraction pipe 35 is arranged in close contact with the wall surface of the conical section 213. This arrangement is conducive to draining the accumulated water in the secondary separation chamber 211.

[0052] like Figure 2As shown, the first-stage separator 11 has a first-stage separation chamber 111 and an inlet pipeline 112 connected to the air inlet pipe, and the first-stage pumping device 31 is arranged in the first-stage separation chamber 111. The first-stage pumping device 31 includes a sand retaining plate 311 and a first-stage pumping pipe 312. The sand retaining plate 311 is arranged opposite to the inlet pipeline 112, and at least a portion of the sand retaining plate 311 extends toward the bottom of the first-stage separation chamber 111; the first-stage pumping pipe 312 is arranged on a side of the sand retaining plate 311 away from the inlet pipeline 112, and at least a portion of the first-stage pumping pipe 312 extends toward the bottom of the first-stage separation chamber 111, and at least another portion of the first-stage pumping pipe 312 is connected to the pumping connecting pipe 32. By arranging the sand retaining plate 311 and the inlet pipeline 112 opposite to each other, the gas entering from the inlet pipeline 112 can be blocked by the sand retaining plate 311 and detoured. Since at least a portion of the sand retaining plate 311 extends toward the bottom of the primary separation chamber 111, the gas can be guided to flow toward the bottom of the primary separation chamber 111, which is conducive to the sliding of sand and gravel, and fully separates the gas from the sand and gravel to ensure the sand removal effect. The primary water pumping pipe 312 is arranged on the side of the sand retaining plate 311 away from the inlet pipeline 112, which can prevent the gas and sand sent from the inlet pipeline 112 from directly impacting the primary water pumping pipe 312 and causing deformation. The primary water pumping pipe 312 extends toward the bottom of the primary separation chamber 111 to ensure that the accumulated water in the primary separation chamber 111 is pumped out. At the same time, the primary water pumping pipe 312 is connected to the water pumping connecting pipe 32, so that the accumulated water pumped out of the primary separation chamber 111 flows to the secondary water pumping device 33 through the water pumping connecting pipe 32.

[0053] like Fig. 9 As shown, the sand retaining plate 311 includes an inclined section 313 and a vertical section 314 connected to each other, the inclined section 313 is inclined in a direction away from the inlet pipeline 112, the vertical section 314 extends toward the bottom of the primary separation chamber 111, and the bottom end of the vertical section 314 is close to the bottom of the primary separation chamber 111 relative to the connecting pipeline 40. By inclining the inclined section 313 in a direction away from the inlet pipeline 112, it is beneficial to gather the gas toward the bottom of the primary separation chamber 111, and the bottom end of the vertical section 314 is closer to the bottom of the primary separation chamber 111 relative to the connecting pipeline 40, increasing the flow stroke of the gas in the primary separation chamber 111, providing sufficient time for the sand to slide down, and preventing the gas containing more sand from directly entering the connecting pipeline 40, thereby ensuring the sand removal effect.

[0054] like Fig. 9 As shown, a sand retaining member 315 is provided at one end of the primary water pumping pipe 312 near the bottom of the primary separation chamber 111, and the sand retaining member 315 is spaced apart from the pipe opening of the primary water pumping pipe 312. This arrangement can prevent the fallen sand and gravel from being directly sucked into the primary water pumping pipe 312, thereby ensuring the sand removal effect.

[0055] Optionally, the sand retaining member 315 is an umbrella-shaped structure, and the apex of the umbrella-shaped structure is detachably arranged on the primary water pumping pipe 312. This is beneficial to further separate the gravel from the pipe opening of the primary water pumping pipe 312, thereby ensuring the sand removal effect.

[0056] Of course, the sand retaining member 315 can also be selected to be a cylindrical structure, the top surface of the cylindrical structure is detachably arranged on the primary water pumping pipe 312, and the bottom surface of the cylindrical structure is opened. This arrangement can ensure the sand removal and water pumping effects while further reducing the risk of gravel impacting the primary water pumping pipe 312, thereby ensuring the life of the primary water pumping pipe 312.

[0057] like Fig. 9 As shown, a plurality of water inlet holes 316 are provided on the side of the primary water pumping pipe 312 away from the sand retaining plate 311, and the water inlet holes 316 are provided at a position of the primary water pumping pipe 312 relative to the sand retaining member 315 close to the bottom of the primary separation chamber 111. This is beneficial to improving the pumping efficiency, and at the same time, under the protection of the sand retaining member 315, it is prevented that the fallen sand and gravel are sucked into the water inlet holes 316 to cause blockage. At the same time, the water inlet holes 316 are provided on the side facing away from the sand retaining plate 311, further preventing the sand and gravel from entering through the water inlet holes 316.

[0058] It should be noted that a plurality of water inlet holes are also provided at one end of the secondary water pumping pipe 35 close to the bottom of the secondary separation chamber 211 to improve the water pumping efficiency.

[0059] like Figure 2 As shown, the central axis of the connecting pipeline 40 is parallel to the central axis of the inlet pipeline 112 and is staggered. The connecting pipeline 40 is arranged near the bottom of the primary separator 11 relative to the inlet pipeline 112. The secondary separator 21 has an outlet pipeline 212 connected to the gas outlet pipe, and the central axis of the outlet pipeline 212 is located on the same straight line as the central axis of the inlet pipeline 112. In other words, the connecting pipeline 40 is staggered and not on the same straight line relative to the extension direction of the inlet pipeline 112 and the outlet pipeline 212, and is closer to the bottom of the primary separator 11, so as to prevent the gas from passing directly and failing to effectively remove sand.

[0060] Preferably, the central axis of the connecting pipeline 40 is staggered with the central axis of the inlet pipeline 112 both in the horizontal direction and in the vertical direction.

[0061] like Figure 5 and Figure 6As shown, the self-pumping device 30 also includes an adapter fixing ring 41, which is arranged at one end of the connecting pipeline 40 connected to the secondary separator 21, and the adapter fixing ring 41 divides the pumping connecting pipe 32 into two sections. This arrangement facilitates the installation of the pumping connecting pipe 32 in sections into the connecting pipeline 40 and the secondary separation chamber 211, avoiding the difficulty of directly inserting the whole, and is also convenient for replacement when some parts are damaged in the later stage, and can adapt to the internal dimensions of different desanders by replacing pumping pipes of different lengths. It should be noted that a plurality of channels are arranged inside the adapter fixing ring 41 to ensure smooth connection of the pipelines on both sides.

[0062] like Figure 5 and Figure 6 As shown, there are multiple primary water pumping pipes 312, and the water pumping connecting pipes 32 are arranged one by one with the primary water pumping pipes 312. That is, the number of the water pumping connecting pipes 32 is the same as the number of the primary water pumping pipes 312. Since the gas first enters the primary separation chamber 111, there is more water accumulated in the primary separation chamber 111, and using multiple primary water pumping pipes 312 is conducive to improving the water pumping efficiency.

[0063] Embodiment 1

[0064] like Figures 1 to 9 As shown, the first-level sand removal equipment 10 also includes a first-level gas sand cut-off valve 12 and a first-level sand accumulation cylinder 13. The sand and gravel separated by the first-level separator 11 is accumulated in the first-level sand accumulation cylinder 13 through the first-level gas sand cut-off valve 12. The second-level sand removal equipment 20 also includes a second-level gas sand cut-off valve 22 and a second-level sand accumulation cylinder 23. The sand and gravel separated by the second-level separator 21 is accumulated in the second-level sand accumulation cylinder 23 through the second-level gas sand cut-off valve 22.

[0065] It should be noted that the primary water pumping pipe 312 will not exceed the valve plate of the primary gas-sand cut-off valve 12 , and the secondary water pumping pipe 35 will not exceed the valve plate of the secondary gas-sand cut-off valve 22 .

[0066] It should be noted that when the gas passes through the primary sand removal equipment 10 and the secondary sand removal equipment 20, the sand and water carried by the gas are separated from the gas. Since the sand has a large deadweight, the separated water will accumulate above the sand and even accumulate in the primary separation chamber 111 and the secondary separation chamber 211. Therefore, a self-pumping device 30 is provided to realize automatic discharge of accumulated water to avoid clogging of pipelines and desanders.

[0067] like Figure 6 As shown, the primary water pumping pipe 312 is directly connected to the water pumping connecting pipe 32 via an adapter 321 .

[0068] In this embodiment, the mounting bracket 39 is a cylinder that matches the inner diameter of the secondary separation chamber 211. At least a portion of the mounting bracket 39 is arranged near the bottom of the secondary separation chamber 211 relative to the pipe mouth of the inlet pipeline 38, so that the adapter fixing ring 41 can be fixed to the connecting pipeline 40 and the mounting bracket 39.

[0069] like Figure 8 As shown, one end of the secondary water pumping pipe 35 and the water pumping connecting pipe 32 connected to the throat section 363 is L-shaped. Taking the secondary water pumping pipe 35 as an example, the extension direction of the end of the secondary water pumping pipe 35 connected to the throat section 363 is first perpendicular to the extension direction of the throat section 363, and then extends in the direction opposite to the gas flow direction through an L-shaped bend, and finally bends again to extend toward the bottom of the secondary separation chamber 211.

[0070] Preferably, the secondary water pumping pipe 35 is arranged to fit the inner wall surface of the secondary separation chamber 211, which can ensure that during use, the secondary water pumping pipe 35 will not be directly impacted by the gas and gravel sent from the connecting pipeline 40 and cause deformation, thereby extending the service life of the product.

[0071] like Figure 2 As shown, the central axis of the connecting pipeline 40 is staggered with the central axis of the outlet pipeline 212 in both the horizontal and vertical directions, and the inlet pipeline 38 has two bends 381 so that the inlet pipeline 38 is close to the connecting pipeline 40 and the pipe mouth is facing the bottom of the secondary separation chamber 211.

[0072] When the fully enclosed self-pumping two-stage series desander of the present application is in use, natural gas rushes into the first-stage desander device 10 with sand and water. After being blocked by the sand baffle 311, most of the sand falls downward and falls into the first-stage sand accumulation cylinder 13, and some water is also retained inside. At this time, the natural gas enters the second-stage desander device 20 from the connecting pipeline 40 with the remaining water and sand, and some sand and water are also allowed to fall in the second-stage desander device 20. At this time, the gas enters the air pipe 371 from the inlet pipeline 38 and reaches the air extraction pipe section 36. At this time, the gas As the flow area decreases and the flow rate increases, a vacuum area is formed on the side and the gas in the secondary pumping pipe 35 and the pumping connecting pipe 32 is pumped away. At this time, if the height of the accumulated water in the primary separation chamber 111 or the secondary separation chamber 211 reaches a level that can overflow all the water inlet holes 316 at the bottom of the primary pumping pipe 312 or the secondary pumping pipe 35, the internal air is pumped away and the air pressure is reduced. The external air pressure will press the accumulated water into the primary pumping pipe 312 or the secondary pumping pipe 35, allowing the water to be pumped away and sent to the next process.

[0073] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0074] 1. By arranging the primary pumping device 31 in the primary separator 11 , the primary pumping device 31 can be used to pump out the accumulated water in the primary separator 11 and send it to the secondary pumping device 33 through the pumping connecting pipe 32 .

[0075] 2. By arranging a secondary pumping device 33 in the secondary separator 21 , the accumulated water in the secondary separator 21 can be pumped out by the secondary pumping device 33 .

[0076] 3. At the same time, since the secondary separator 21 is connected to the primary separator 11 through the connecting pipeline 40, water pumping can be achieved while ensuring the gas desanding process. No external equipment is required, and the internal pressure of the desander will not be damaged. Automatic water pumping can be completed inside the desander.

[0077] 4. By setting up a reduced diameter pipe section 362, a throat section 363 and a diffuser section 364 connected in sequence, the diameters of the reduced diameter pipe section 362 and the diffuser section 364 gradually increase in the direction away from the throat section 363. The flow rate of the gas is greatly increased in the process of passing through a structure from wide to narrow and then to wide. The throat section 363 is connected to the secondary water pumping pipe 35. Since the air pressure in the secondary separation chamber 211 is higher than the air pressure in the throat section 363, the gas in the secondary separation chamber 211 will press the accumulated water into the secondary water pumping pipe 35, and then the accumulated water and the gas will merge in the throat section 363, thereby achieving the function of clearing the accumulated water in the secondary separation chamber 211.

[0078] 5. The pumping connecting pipe 32 is connected to the throat section 363, so that the accumulated water in the primary separator 11 pumped out by the primary pumping device 31 can be sent to the throat section 363 to merge with the gas, thereby cleaning the accumulated water inside the desander.

[0079] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully enclosed self-pumping two-stage series desander, characterized in that: include: A primary sand removal device (10), the primary sand removal device (10) comprising a primary separator (11), the primary separator (11) being used to be connected to an air intake pipe; A secondary sand removal device (20), the secondary sand removal device (20) comprising a secondary separator (21), the secondary separator (21) being used to be connected to an air outlet pipe, the secondary separator (21) being in communication with the primary separator (11) via a connecting pipeline (40); A self-pumping device (30), the self-pumping device (30) comprising a primary pumping device (31), a pumping connection pipe (32) and a secondary pumping device (33) connected in sequence, the primary pumping device (31) being arranged in the primary separator (11), the secondary pumping device (33) being arranged in the secondary separator (21), the self-pumping device (30) being used to pump out the accumulated water in the primary separator (11) and the secondary separator (21).

2. The self-pumping two-stage series desander according to claim 1 is characterized in that: The secondary separator (21) has a secondary separation chamber (211) and an outlet pipeline (212) connected to the air outlet pipe. The secondary pumping device (33) is arranged in the secondary separation chamber (211). The secondary pumping device (33) comprises: An air suction mechanism (34), the air suction mechanism (34) being in communication with the outlet pipeline (212), and the air suction mechanism (34) being used to generate negative pressure suction; A secondary water pumping pipe (35) is connected to the air pumping mechanism (34) so ​​that the secondary water pumping pipe (35) pumps out water while the air pumping mechanism (34) generates negative pressure suction.

3. The self-pumping two-stage series desander according to claim 2 is characterized in that: The air extraction mechanism (34) comprises: An air suction pipe section (36), the air suction pipe section (36) being coaxially connected to the outlet pipeline (212), and the air suction pipe section (36) being capable of generating negative pressure suction; a docking assembly (37), at least a portion of which is in communication with an end of the air extraction pipe section (36) that is away from the outlet pipeline (212); An inlet pipeline (38), one end of which is connected to the docking assembly (37), and the inlet pipeline (38) has at least one bending portion (381), and the bending portion (381) is used to change the extension direction of the inlet pipeline (38) so that the pipe opening at the other end of the inlet pipeline (38) is arranged toward the bottom of the secondary separator (21).

4. The self-pumping two-stage series desander according to claim 3 is characterized in that: The air extraction pipe section (36) comprises: A butt joint pipe section (361), wherein the butt joint pipe section (361) is connected to the butt joint assembly (37); A reduced diameter pipe section (362), wherein the diameter of the reduced diameter pipe section (362) is gradually reduced in a direction away from the butt-joint pipe section (361); A throat section (363), the tube wall of the throat section (363) being in communication with the secondary water pumping pipe (35) and the water pumping connecting pipe (32); A diffuser pipe section (364), wherein the diameter of the diffuser pipe section (364) is gradually expanded in a direction away from the throat pipe section (363), and the diffuser pipe section (364) is connected to the outlet pipeline (212).

5. The self-pumping two-stage series desander according to claim 3 is characterized in that: The docking assembly (37) comprises: An air pipe (371), the air pipe (371) being coaxially connected to the air extraction pipe section (36); A blocking pipe section (372) is coaxially sleeved outside the trachea (371), and the blocking pipe section (372) and the trachea (371) are spaced apart to form a clearance gap, so that at least a portion of the inlet pipeline (38) extends into the clearance gap.

6. The self-pumping two-stage series desander according to claim 5 is characterized in that: The blocking pipe section (372) is provided with a plurality of threaded holes (373) at intervals, the threaded holes (373) passing through the pipe wall of the blocking pipe section (372), and the docking assembly (37) further comprises a plurality of locking bolts (374), the locking bolts (374) passing through the threaded holes (373) and abutting against the inlet pipeline (38).

7. The self-pumping two-stage series desander according to claim 6 is characterized in that: The inlet pipeline (38) is threadedly connected to the air pipe (371) and the blocking pipe section (372); one end of the inlet pipeline (38) extending into the clearance interval is provided with a convex ring (382); the convex ring (382) is arranged corresponding to the position of the threaded hole (373) so that the locking bolt (374) abuts against the convex ring (382).

8. The self-pumping two-stage serial desander according to claim 3 is characterized in that: The secondary pumping device (33) further comprises a mounting bracket (39), wherein the mounting bracket (39) is used to fix the inlet pipeline (38), and at least a portion of the mounting bracket (39) is arranged near the bottom of the secondary separation chamber (211) relative to the pipe mouth of the inlet pipeline (38).

9. The self-pumping two-stage series desander according to claim 2, characterized in that: One end of the secondary water pumping pipe (35) away from the air pumping mechanism (34) extends toward the bottom of the secondary separation chamber (211); a conical section (213) is provided at the bottom of the secondary separation chamber (211); and at least a portion of the secondary water pumping pipe (35) is arranged in close contact with the wall surface of the conical section (213).

10. The self-pumping two-stage series desander according to any one of claims 1 to 9, characterized in that: The primary separator (11) has a primary separation chamber (111) and an inlet pipeline (112) connected to the air inlet pipe. The primary pumping device (31) is arranged in the primary separation chamber (111). The primary pumping device (31) comprises: a sand retaining plate (311), the sand retaining plate (311) being arranged opposite to the inlet pipeline (112), and at least a portion of the sand retaining plate (311) extending toward the bottom of the primary separation chamber (111); A primary water pumping pipe (312), the primary water pumping pipe (312) being arranged on a side of the sand retaining plate (311) away from the inlet pipeline (112), at least a portion of the primary water pumping pipe (312) extending toward the bottom of the primary separation chamber (111), and at least another portion of the primary water pumping pipe (312) being connected to the water pumping connecting pipe (32).

11. The self-pumping two-stage serial desander according to claim 10, characterized in that: The sand retaining plate (311) comprises an inclined section (313) and a vertical section (314) which are connected to each other, wherein the inclined section (313) is inclined in a direction away from the inlet pipeline (112), and the vertical section (314) extends toward the bottom of the primary separation chamber (111), and the bottom end of the vertical section (314) is close to the bottom of the primary separation chamber (111) relative to the connecting pipeline (40).

12. The self-pumping two-stage serial desander according to claim 10, characterized in that: A sand retaining piece (315) is provided at one end of the primary water extraction pipe (312) close to the bottom of the primary separation chamber (111), and the sand retaining piece (315) is spaced apart from the pipe opening of the primary water extraction pipe (312).

13. The self-pumping two-stage serial desander according to claim 12, characterized in that: The sand retaining member (315) is an umbrella-shaped structure, and the apex of the umbrella-shaped structure is detachably arranged on the primary water pumping pipe (312).

14. The self-pumping two-stage serial desander according to claim 12, characterized in that: The sand retaining member (315) is a cylindrical structure, the top surface of which is detachably arranged on the primary water pumping pipe (312), and the bottom surface of which is open.

15. The self-pumping two-stage serial desander according to claim 12, characterized in that: A plurality of water inlet holes (316) are provided on a side of the primary water pumping pipe (312) away from the sand retaining plate (311), and the water inlet holes (316) are provided at a position of the primary water pumping pipe (312) relative to the sand retaining member (315) and close to the bottom of the primary separation chamber (111).

16. The self-pumping two-stage series desander according to claim 10, characterized in that: The central axis of the connecting pipeline (40) is parallel to and staggered with the central axis of the inlet pipeline (112); the connecting pipeline (40) is arranged close to the bottom of the primary separator (11) relative to the inlet pipeline (112); the secondary separator (21) has an outlet pipeline (212) connected to the gas outlet pipe; the central axis of the outlet pipeline (212) is located on the same straight line as the central axis of the inlet pipeline (112).

17. The self-pumping two-stage series desander according to any one of claims 1 to 9, characterized in that: The self-pumping equipment (30) further comprises a switching fixing ring (41), wherein the switching fixing ring (41) is arranged at one end of the connecting pipeline (40) connected to the secondary separator (21), and the switching fixing ring (41) divides the water pumping connecting pipe (32) into two sections.

18. The self-pumping two-stage serial desander according to claim 10, characterized in that: There are multiple first-level water pumping pipes (312), and the water pumping connecting pipes (32) are arranged in a one-to-one correspondence with the first-level water pumping pipes (312).

Images