Jet flow negative pressure bailing barrel

Abstract

The invention provides a jet flow negative pressure sand bailing barrel, and belongs to the technical field of oil field underground sand bailing barrels, the jet flow negative pressure sand bailing barrel comprises a barrel pipe and a jet flow negative pressure spray head, the jet flow negative pressure spray head is installed at the front end of the barrel pipe, the barrel pipe comprises a main pipe and an auxiliary pipe which are arranged side by side, and the auxiliary pipe is connected with the jet flow negative pressure spray head and used for conveying power liquid; a liquid inlet is formed between the main pipe and the jet flow negative pressure nozzle; the jet flow negative pressure sprayer comprises a first nozzle and a second nozzle, the first nozzle faces the advancing direction of the sand bailing barrel, and first jet flow is generated in the advancing direction during use; the second nozzle is located in the main pipe and faces the main pipe, second jet flow is generated in the main pipe during use, negative pressure is formed in the main pipe, and sand grains are pumped into the main pipe through the liquid inlet. The rotary jet flow is used for flushing deposited gravel, negative pressure is formed in the inner cavity of the bailing barrel, the suction effect is generated, solid-liquid mixed-phase fluid generated by the rotary jet flow is sucked into the bailing barrel, flushing and bailing integrated operation is achieved, and the sand cleaning efficiency of the horizontal well section is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oilfield downhole sand bailing barrel, and particularly relates to a jet negative pressure sand bailing barrel. BACKGROUND

[0002] With the deep development of oil and gas fields, the proportion of horizontal wells increases year by year, and the length of horizontal sections increases rapidly. During the production and development of horizontal wells, sand particles often deposit in the horizontal section and the build-up section, especially in sandstone reservoirs: the sand production is large, the sand particle diameter is large, and the normal production of the horizontal well is seriously affected. The operation modes for removing sand particles in the wellbore mainly include sand washing operation and sand bailing operation. The sand washing process is fast and efficient and is widely used, but it cannot effectively clean the sand particles with large particle size in the horizontal section and the build-up section; the currently used various sand bailing tools cannot effectively impact the scale body and cannot completely clean the sand, and the sand bailing effect is poor; at the same time, the sand bailing barrel has small volume, and the sand bailing amount per well is small, and the operation efficiency is low. SUMMARY

[0003] To solve the above problems of the prior art, the present application provides a jet negative pressure sand bailing barrel, which aims to use rotating jet to impact and flush the deposited sand and scale, and to form negative pressure at the inlet of the sand bailing barrel cavity to generate suction effect, so as to suck the solid-liquid mixed phase fluid generated by the rotating jet into the sand bailing barrel, realize integrated flushing and sand bailing operation, and effectively improve the sand cleaning efficiency of the horizontal well section.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A jet negative pressure sand bailing barrel comprises a barrel pipe and a jet negative pressure nozzle, the jet negative pressure nozzle is installed at the front end of the barrel pipe, the barrel pipe comprises a main pipe and a secondary pipe arranged side by side, the secondary pipe is connected with the jet negative pressure nozzle and used for conveying power fluid, and there is a liquid inlet between the main pipe and the jet negative pressure nozzle.

[0006] The jet negative pressure nozzle comprises a first nozzle and a second nozzle, the first nozzle faces the forward direction of the sand bailing barrel, and generates a first jet in the forward direction during use; the second nozzle is located in the main pipe and faces the main pipe direction, and generates a second jet in the main pipe direction during use, thereby forming negative pressure in the main pipe, and sand particles are sucked into the main pipe through the liquid inlet.

[0007] Further, the jet negative pressure nozzle comprises a first jet head and a second jet head which are rotatably connected with each other, the first jet head is provided with a plurality of first nozzles, and the axes of the plurality of first nozzles converge at a same ball center; the second jet head is provided with at least one second nozzle whose axis coincides with the axis of the main pipe.

[0008] Further, the first jet head generates a first jet flow to the front end of the hemispherical surface, impacting and flushing the deposited sand and scale, and keeping the generated solid-liquid mixed phase fluid in a long-time suspended state, and the second jet head generates a second jet flow to the rear end of the main pipe, forming a negative pressure in the main pipe to suck the solid-liquid mixed phase fluid into the main pipe.

[0009] Further, the first jet head is provided with four first nozzles, and the first nozzles are at a preset angle with the axial direction of the barrel pipe.

[0010] Further, the first nozzle has a first preset diameter, and the second nozzle has a second preset diameter.

[0011] Further, the second preset diameter is greater than the first preset diameter.

[0012] Further, the barrel pipe includes an outer wall and an inner wall, the inner wall forms a secondary pipe, and the space between the inner wall and the outer wall forms a main pipe, and the barrel pipe has two secondary pipes, which are located outside the main pipe and are symmetrically arranged along the axial center of the barrel pipe.

[0013] Further, one end of the barrel pipe has a contraction and a reduced diameter, and the barrel pipe is connected by a sliding sleeve.

[0014] Further, the barrel pipe includes an A-type barrel pipe and a B-type barrel pipe, the main pipe and the secondary pipe in the A-type barrel pipe are through from front to back, the secondary pipe in the A-type barrel pipe includes a straight segment and a curved segment connected to each other, one end of the curved segment connected to the jet negative pressure nozzle is at a preset angle with the axial direction of the main pipe and protrudes towards the main pipe.

[0015] The secondary pipe in the B-type barrel pipe is through from front to back, and one end of the main pipe is sealed, the jet negative pressure nozzle, the A-type barrel pipe and the B-type barrel pipe are connected in sequence, and the sealed end of the main pipe in the B-type barrel pipe faces away from the direction of the jet negative pressure nozzle.

[0016] Further, the barrel pipe further includes a C-type barrel pipe, the main pipe and the secondary pipe in the C-type barrel pipe are straight and through from front to back, and the C-type barrel pipe is arranged between the A-type barrel pipe and the B-type barrel pipe.

[0017] Further, the C-type barrel pipe is provided with a flap on the main pipe, and the flap unidirectionally moves away from the direction of the jet negative pressure nozzle.

[0018] Further, the outer wall of the B-type barrel pipe is provided with an opening window, and a filter screen is installed at the opening window.

[0019] Further, the outer wall of the C-type barrel pipe is provided with an opening window, and a filter screen is installed at the opening window.

[0020] Further, the opening window has a preset size, and the filter screen has a preset mesh size.

[0021] Furthermore, the jet negative pressure sand-collecting cylinder also includes a conversion joint, one end of which is connected to the sealed end of the main pipe in the B-type cylinder, and the other end of which is connected to the screen pipe.

[0022] Furthermore, the jet negative pressure sand-collecting cylinder also includes a guide shoe, the inner surface of which is streamlined, and the guide shoe is connected to the end of the cylinder facing the jet negative pressure nozzle.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This invention uses a high-speed rotating jet generated by a jet negative pressure nozzle to powerfully impact and propel sand particles in the wellbore, efficiently flushing sand and keeping the sand particles in a suspended state for a long time. The high-speed fluid generated by the jet negative pressure nozzle creates a negative pressure at the main inlet of the sand removal cylinder, generating a suction effect that draws the solid-liquid mixed-phase fluid generated after the sand particles are flushed into the sand removal cylinder, realizing an integrated flushing and sand removal operation and effectively improving the sand removal efficiency of horizontal well sections.

[0025] 2. By installing a filter screen on the casing, finer sand particles in the main pipe can pass through the filter screen and be flushed out of the main pipe and returned to the wellbore under the action of high-speed jet, while larger sand particles remain in the main pipe, so that larger sand particles in the horizontal section and the directional section can be effectively cleaned.

[0026] 3. By installing flaps on the tubing, which are unidirectional movable baffles, sand backflow can be prevented, and the sand-removing tube can be easily disassembled after being pulled out of the wellhead, thus improving the sand-removing efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a jet negative pressure sand-retrieving cylinder according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the EE cross section;

[0029] Figure 3 This is a schematic diagram of a tube structure according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of a flap structure according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of a jet negative pressure nozzle structure according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the working principle of one embodiment of the present invention (direction F);

[0033] Figure 7This is a schematic diagram of the working principle of one embodiment of the present invention (G direction).

[0034] In the picture:

[0035] 1-Boll tube, 101-Outer wall, 102-Inner wall, 2-Jet negative pressure nozzle, 3-Main tube, 4-Sub-tube, 401-Straight section, 402-Bent section, 5-Liquid inlet, 6-First nozzle, 7-Second nozzle, 8-First jet head, 9-Second jet head, 10-Type A tube, 11-Type B tube, 12-Type C tube, 13-Flip plate, 14-Filter screen, 15-Sliding sleeve union, 16-Conversion joint, 17-Guiding shoe. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Furthermore, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies both A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] To better understand the purpose, structure, and function of this invention, specific embodiments of the invention will be described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] like Figures 1-7 As shown, a jet negative pressure sand-retrieving cylinder includes a cylinder tube 1 and a jet negative pressure nozzle 2. The jet negative pressure nozzle 2 is installed at the front end of the cylinder tube 1. The cylinder tube 1 includes a main pipe 3 and a secondary pipe 4 arranged side by side. The secondary pipe 4 is connected to the jet negative pressure nozzle 2 and is used to transport power fluid. There is a liquid inlet 5 between the main pipe 3 and the jet negative pressure nozzle 2.

[0043] The jet negative pressure nozzle 2 includes a first nozzle 6 and a second nozzle 7. The first nozzle 6 faces the direction of the sand scooping cylinder and generates a first jet in the direction of the cylinder when in use. The second nozzle 7 is located inside the main pipe 3 and faces the main pipe 3. When in use, it generates a second jet in the direction of the main pipe 3, forming a negative pressure inside the main pipe 3. Sand particles are drawn into the main pipe 3 through the liquid inlet 5.

[0044] Furthermore, the jet negative pressure nozzle 2 includes a first jet head 8 and a second jet head 9 rotatably connected to each other. The first jet head 8 is provided with a plurality of first nozzles 6, and the axes of the plurality of first nozzles 6 converge at the same sphere center. The second jet head 9 is provided with at least one second nozzle 7 whose axis coincides with the axis of the main pipe 3. The jet negative pressure nozzle 2 causes the liquid flow channel to narrow at the first nozzle 6 and the second nozzle 7. In use, the first jet head 8 generates a first jet towards the front hemispherical surface to impact and wash the deposited sand and scale. The washed sand particles mix with the liquid to generate a solid-liquid mixed-phase fluid. Under the action of the first jet, the solid-liquid mixed-phase fluid is in a suspended state for a long time. The second jet head 9 generates a second jet towards the rear end of the main pipe 3, forming a negative pressure in the main pipe 3 and drawing the solid-liquid mixed-phase fluid into the main pipe 3.

[0045] Furthermore, the first spray head 8 is provided with four first nozzles 6, and the first nozzles 6 are at a preset angle to the axis of the tube 1.

[0046] Furthermore, the diameter of the first nozzle 6 is a first preset diameter, and the diameter of the second nozzle 7 is a second preset diameter.

[0047] Furthermore, the second preset diameter is larger than the first preset diameter.

[0048] Furthermore, the tube 1 includes an outer wall 101 and an inner wall 102. The inner wall 102 forms a secondary tube 4, and the space between the inner wall 102 and the outer wall 101 forms a main tube 3. There are two secondary tubes 4 inside the tube 1. The two secondary tubes 4 are located outside the main tube 3 and are symmetrically arranged along the axis of the tube 1.

[0049] Furthermore, at one end of each of the plurality of cylindrical tubes 1, the main tube 3 and the secondary tube 4 have a reduced diameter, and the plurality of main tubes 3 and secondary tubes 4 are inserted sequentially, and the cylindrical tubes 1 are connected by a sliding sleeve 15.

[0050] Furthermore, the tube 1 includes a type A tube 10 and a type B tube 11. The main tube 3 and the auxiliary tube 4 in the type A tube 10 are connected from front to back. The auxiliary tube 4 in the type A tube 10 includes a straight section 401 and a curved section 402 connected to each other. The end of the curved section 402 connected to the jet negative pressure nozzle 2 is at a preset angle to the axis of the main tube 3 and extends into the main tube 3.

[0051] The secondary tube 4 in the B-type tube 11 is connected from front to back, and one end of the main tube 3 is sealed. The jet negative pressure nozzle 2, the A-type tube 10, and the B-type tube 11 are connected in sequence. The sealed end of the main tube 2 in the B-type tube 11 is away from the direction of the jet negative pressure nozzle 2.

[0052] Furthermore, the tube 2 also includes a C-type tube 12, in which the main tube 3 and the auxiliary tube 4 are both straight and pass through each other. The C-type main tube 12 is located between the A-type tube 10 and the B-type tube 11.

[0053] Furthermore, the main pipe 3 of the C-shaped tube 12 is equipped with a baffle-type flap 13. The flap 13 moves unidirectionally away from the jet negative pressure nozzle 2 to prevent sand particles from flowing back and to facilitate the disassembly of the sand-collecting tube after it is pulled out of the wellhead.

[0054] Furthermore, the outer wall of the B-type tube 11 is provided with a window, and a filter screen 14 is installed at the window. The solid-liquid mixed phase fluid enters the main tube 3, flows out through the upper filter screen 14 and merges into the annulus, while the sand particles are left in the main tube 3, thereby realizing the integrated operation of flushing and sand removal, and improving the sand removal efficiency of the horizontal well section.

[0055] In some preferred embodiments of this example, the outer wall of the C-shaped tube is provided with a window, and a filter screen 14 is installed at the window. The solid-liquid mixed-phase fluid enters the main tube 3, flows out through the upper filter screen 14 and merges into the annulus, while the sand particles are left in the main tube 3, thereby realizing the integrated operation of flushing and sand removal and improving the sand removal efficiency of the horizontal well section.

[0056] Furthermore, the window is of a preset size, and the filter 14 has preset mesh size.

[0057] Furthermore, the jet negative pressure sand-removing cylinder also includes a conversion joint 16. One end of the conversion joint 16 is connected to the sealed end of the main pipe in the B-type cylinder 11, and the other end of the conversion joint 16 is connected to the screen pipe, guiding the liquid (power fluid / sand-washing fluid) in the upper oil pipe and the screen pipe to the symmetrically distributed secondary pipes 4. The conversion joint 16 is connected to the cylinder 1 by a union lock cap, which is quick and reliable.

[0058] Furthermore, the jet negative pressure sand-collecting cylinder also includes a guide shoe 17. The inner surface of the guide shoe 17 is streamlined. The guide shoe 17 is connected to the end of the cylinder 1 facing the jet negative pressure nozzle 2, which can effectively guide sand particles into the sand-collecting cylinder.

[0059] Example 2

[0060] The difference from Example 1 is that in this example:

[0061] The jet negative pressure sand-removing cylinder includes a conversion joint, a cylinder tube, a jet negative pressure nozzle, and a guide shoe connected in sequence. The cylinder tube of the sand-removing cylinder consists of a main tube and pre-fabricated auxiliary tubes (1 or 2 tubes, the specific number and size can be determined according to the actual working conditions). The end face of the sand-removing cylinder is designed with a circular water tank that connects the flow channels of the auxiliary tubes. The sand-washing liquid is injected from the upper auxiliary tube, enters the next auxiliary tube through the circular water tank, and finally sprays out from the jet negative pressure nozzle. This design simplifies the docking process of the sand-removing cylinder and solves the problem of auxiliary tube docking during the docking process.

[0062] The uniform outer diameter of each conversion joint, tube, and guide shoe in the jet negative pressure sand dredging cylinder reduces the risk of snagging during the washing and sand dredging operation.

[0063] The top of the adapter has a female oil pipe thread, which connects to the upper screen pipe; the bottom of the adapter is designed with a sliding union that connects to the lower cylinder. It is hung on the bottom of the adapter by the union. When connecting to the lower cylinder, it can be removed from the hanging point by rotating clockwise. After aligning with the lower cylinder, continue to rotate clockwise to connect to the lower cylinder.

[0064] like Figures 2-3 As shown, the upper end of the tube is designed with a male threaded union, which connects and seals with the upper adapter or sliding sleeve union.

[0065] like Figure 1 As shown, the inner cavity of the first type B spool connecting the adapter is closed, while the type C spool is open at both ends, as shown. Figure 6 , Figure 7 As shown, the liquid (power fluid / sand flushing fluid) in the upper oil pipe flows down to the jet negative pressure nozzle through the secondary pipe;

[0066] The B-type tubing is located at the top of the sand-removing tubing. A 30mm*30mm window is opened in the wall of the B-type tubing to install a filter screen, so that fine sand particles can be returned from the sand-removing tubing to the wellbore, thereby improving the sand-removing ability.

[0067] The C-type cylinder is located at the bottom of the sand-dredging cylinder, such as... Figure 4 As shown, a flap is installed inside the main pipe of the C-type cylinder to prevent sand particles entering the sand-collecting cylinder from leaking out.

[0068] like Figure 5As shown, the jet negative pressure nozzle consists of a second nozzle fixed at the rear, a rotary joint in the middle, and a first nozzle at the front. The first nozzle can rotate relative to the cylinder axis under the push of the oblique jet, while the second nozzle is fixed relative to the cylinder.

[0069] The second jet head is equipped with a second nozzle (4mm or 6mm in diameter). After generating a high-speed jet, a negative pressure is generated in the internal narrowing section, which draws the solid-liquid mixed fluid generated by the rotating jet unblocking nozzle into the sand-removing cylinder. On the other hand, the high-speed fluid vigorously impacts and pushes the sand particles entering the cylinder, improving the sand-removing ability and efficiency.

[0070] The central rotary joint drives the lower rotating jet unblocking nozzle to generate a powerful flushing fluid flow.

[0071] The first jet head is equipped with four evenly distributed first nozzles with 3mm inclined internal flow channels. The flow channel axis is at a 45° angle with the jet head assembly axis, which can generate self-rotation to powerfully clean the well barrel wall and cause the solid-liquid fluid generated by flushing to rotate, so as to facilitate the rapid and efficient suction of the solid-liquid fluid into the sand removal cylinder.

[0072] in:

[0073] At least one of the second nozzles is located at the center of the second jet head. After generating a high-speed jet, it generates a negative pressure, which draws the solid-liquid mixed-phase fluid generated by the rotating jet unblocking nozzle into the sand-removing cylinder and carries it deep into the sand-removing cylinder.

[0074] Four first nozzles are evenly distributed on the circumference of the first spray head. Each first nozzle has an inclined internal flow channel with an inner diameter of 3 mm. The first nozzle is at an angle of 45° to the axis, which can generate high impact pressure to impact the scale. At the same time, the generated rotating jet fully covers and cleans the pipe wall, and causes the solid and liquid fluid generated by rinsing to rotate, so as to facilitate the rapid and efficient suction of the solid and liquid fluid into the sand removal cylinder.

[0075] Example 3

[0076] This embodiment describes the prefabrication, on-site connection, and well insertion process of the jet negative pressure sand-removing cylinder of the present invention. It is used in a wellbore with a 5” casing and an inner diameter of 105mm, as detailed below:

[0077] 1. The overall outer diameter of the horizontal well rotary flushing negative pressure sand-retrieving tube tool string is 89mm, and 89mm (3 1 / 2”) tubing is selected as the main material; the internal flow channel auxiliary pipe is selected as 12.7mm (1 / 2”) tubing, both of which are commonly used pipe materials in oil and gas fields.

[0078] 2. Cut off both ends (couplings and male threads) of the 89mm (3 1 / 2”) oil pipe and machine the connecting threads.

[0079] 3. According to Figure 2 ,Figure 3 The design includes prefabrication of the conversion joint, the upper joint assembly of the sand-dredging cylinder, the lower joint assembly of the sand-dredging cylinder, and the spray head assembly. The upper fixed spray head is equipped with five 4mm jet nozzles, one in the center and the other four evenly distributed, with the center line forming a 30° angle with the spray head axis. 0 The lower rotating jet unblocking nozzle is equipped with four evenly distributed nozzles with 3mm angled internal flow channels. The axial direction of the flow channel makes a 45° angle with the axis of the jet head assembly. 0 .

[0080] 4. Pass the two 12.7mm (1 / 2”) auxiliary pipes through and seat them into the auxiliary pipe seat, and seal them to complete the prefabrication and installation of the sand dredging cylinder.

[0081] 5. Select a hydraulic four-way connector of the appropriate specification. After connecting the left and right ends to the horizontal outlets of the two auxiliary pipes via shorting connections, tighten them with locking caps. Connect the upper end of the four-way connector to the fixed spray head assembly; connect the lower end to the rotary joint and the lower rotating jet unblocking nozzle to complete the installation of the spray head assembly.

[0082] 6. Connect the screen pipe, adapter, sand scooping cylinder, jetting head assembly, and guide shoe into the wellhead tool string in sequence. Pump according to the designed displacement and check for looseness or leakage at the connection points; check whether the jetting head assembly, flap, etc. are operating normally.

[0083] 7. Following the sand flushing and dredging construction design, after descending to the designated position, start the pump for circulation. If there are no abnormalities, flush and dredge the sand according to the designed discharge rate. Observe and record the pump pressure changes during the sand flushing and dredging process.

[0084] 8. If the pump pressure is consistently higher than the design pump pressure, lift the tubing string to the ground, clean the sand from the sand removal cylinder, and then put it back into the well. Repeat the above operation until the sand is removed to the design position.

[0085] 9. After flushing and sand removal, remove the downhole tool assembly, disassemble and clean it, and inspect the connectors, flaps, sealing rings, nozzles and lock caps, and replace any damaged components.

[0086] Based on a 100-meter sand dredging cylinder, the amount of sand dredged each time in this embodiment is approximately 0.45 cubic meters.

[0087] Example 4

[0088] The difference from Example 3 is that the diameter of the sand-retrieving cylinder tool string is different in this example, as detailed below:

[0089] 1. The horizontal well rotary flushing negative pressure sand-removing cylinder is designed with tubing with an outer diameter of 98mm and an inner diameter of 78mm; the internal flow channel auxiliary pipe is tubing with an outer diameter of 15mm and an inner diameter of 12mm.

[0090] 2. Machining connecting threads at both ends of the 98mm oil pipe.

[0091] 3. According to Figure 2 , Figure 3 The design includes prefabrication of the conversion joint, the upper joint assembly of the sand-dredging cylinder, the lower joint assembly of the sand-dredging cylinder, and the spray head assembly. The upper fixed spray head is equipped with five 6mm jet nozzles, one in the center and the other four evenly distributed, with the center line forming a 30° angle with the spray head axis. 0 The lower rotating jet unblocking nozzle is equipped with four evenly distributed nozzles with 3mm angled internal flow channels. The axial direction of the flow channel makes a 45° angle with the axis of the jet head assembly. 0 .

[0092] 4. Pass the two 15mm auxiliary pipes through and seat them into the auxiliary pipe seat, then seal them to complete the prefabrication and installation of the sand dredging cylinder.

[0093] 5. Select a hydraulic four-way connector of the appropriate specification. After connecting the left and right ends to the horizontal outlets of the two auxiliary pipes via shorting connections, tighten them with locking caps. Connect the upper end of the four-way connector to the fixed spray head assembly; connect the lower end to the rotary joint and the lower rotating jet unblocking nozzle to complete the installation of the spray head assembly.

[0094] 6. Connect the screen pipe, adapter, sand scooping cylinder, jetting head assembly, and guide shoe into the wellhead tool string in sequence. Pump according to the designed displacement and check for looseness or leakage at the connection points; check whether the jetting head assembly, flap, etc. are operating normally.

[0095] 7. Following the sand flushing and dredging construction design, after descending to the designated position, start the pump for circulation. If there are no abnormalities, flush and dredge the sand according to the designed discharge rate. Observe and record the pump pressure changes during the sand flushing and dredging process.

[0096] 8. If the pump pressure is consistently higher than the design pump pressure, lift the tubing string to the ground, clean the sand in the sand removal cylinder, and then put it back into the well. Repeat the above operation until the sand is flushed and removed to the design position.

[0097] 9. After sand removal is completed, remove the downhole tool assembly, disassemble and clean it, and inspect the connectors, flaps, sealing rings, nozzles and lock caps, and replace any damaged components.

[0098] Based on a 100-meter sand dredging cylinder, the amount of sand dredged each time in this embodiment is approximately 0.5 cubic meters.

[0099] Through the use and verification of Examples 3 and 4, it is shown that the jet negative pressure sand-removing cylinder of the present invention can realize the integrated operation of flushing and sand removal, effectively improving the sand removal efficiency of horizontal well sections.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A jet vacuum sand bailer characterized by, The jet negative pressure nozzle is connected with the auxiliary pipe for conveying power fluid, and the main pipe is provided with a liquid inlet between the jet negative pressure nozzle. The jet negative pressure nozzle comprises a first nozzle and a second nozzle, the first nozzle faces the forward direction of the sand bailing barrel and generates a first jet in the forward direction during use, the second nozzle is located in the main pipe and faces the main pipe, and generates a second jet in the direction of the main pipe during use, thereby forming a negative pressure in the main pipe and sucking sand grains into the main pipe through the liquid inlet.

2. The jet negative pressure sand bailer of claim 1, wherein, The jet negative pressure nozzle comprises a first jet head and a second jet head which are rotatably connected with each other, the first jet head is provided with a plurality of first nozzles, and the axes of the plurality of first nozzles converge at a same spherical center; and the second jet head is provided with at least one second nozzle whose axis is coincident with the axis of the main pipe.

3. The jet negative pressure sand bailer of claim 2, wherein, During use, the first jet head generates a first jet to the hemispherical surface of the front end, so as to impact and flush the deposited sand and scale, and make the generated solid-liquid mixed phase fluid in a long-time suspended state; and the second jet head generates a second jet to the rear end of the main pipe, so as to form a negative pressure in the main pipe and suck the solid-liquid mixed phase fluid into the main pipe.

4. The jet negative pressure sand bailer of claim 2, wherein, The first jet head is provided with four first nozzles, and the first nozzles are at a preset angle with the axial direction of the barrel.

5. The jet negative pressure sand bailer of claim 2, wherein, The first nozzles have a first preset diameter, and the second nozzles have a second preset diameter.

6. The jet under- vacuum sand screen of claim 5, wherein, The second preset diameter is greater than the first preset diameter.

7. The jet negative pressure sand screen of claim 1, wherein, The barrel comprises an outer wall and an inner wall, the inner wall forms the auxiliary pipe, a space between the inner wall and the outer wall forms the main pipe, and the barrel is provided with two auxiliary pipes, the two auxiliary pipes are located outside the main pipe and are symmetrically arranged along the axial center of the barrel.

8. The jet negative pressure sand bailer of claim 7, wherein, One end of a plurality of barrels is provided with a contraction and a diameter reduction, and a plurality of main pipes and auxiliary pipes are sequentially inserted and embedded, and the barrels are connected by sliding sleeves.

9. The jet negative pressure sand screen of claim 8, wherein, The barrel comprises an A-type barrel and a B-type barrel, the main pipe and the auxiliary pipe in the A-type barrel are through from front to back, the auxiliary pipe in the A-type barrel comprises a straight section and a curved section which are connected with each other, one end of the curved section connected with the jet negative pressure nozzle is at a preset angle with the axial direction of the main pipe and protrudes towards the main pipe; the auxiliary pipe in the B-type barrel is through from front to back, one end of the main pipe is sealed, the jet negative pressure nozzle, the A-type barrel and the B-type barrel are sequentially connected, and one end of the main pipe sealed in the B-type barrel faces away from the direction of the jet negative pressure nozzle.

10. The jet negative pressure sand screen of claim 9, wherein, The barrel further comprises a C-type barrel, the main pipe and the auxiliary pipe in the C-type barrel are straight and through from front to back, and the C-type barrel is arranged between the A-type barrel and the B-type barrel.

11. The jet negative pressure sand screen of claim 10, wherein, The main pipe of the C-type barrel is provided with a flap which unidirectionally moves away from the direction of the jet negative pressure nozzle.

12. The jet negative pressure sand screen of claim 9, wherein, The outer wall of the B-type barrel is provided with an opening window, and a filter screen is arranged at the opening window.

13. The jet negative pressure sand screen of claim 10, wherein, The outer wall of the C-type barrel is provided with an opening window, and a filter screen is arranged at the opening window.

14. The jet negative pressure sand screen of claims 12 or 13, wherein, The opening window has a preset size, and the filter screen has a preset mesh size.

15. The jet negative pressure sand screen of claim 9, wherein, The jet negative pressure sand bailing barrel further comprises a conversion joint, one end of the conversion joint is connected with one end of the main pipe sealed in the B-type barrel, and the other end of the conversion joint is connected with a screen pipe.

16. The jet negative pressure sand screen of claim 1, wherein, The jet negative pressure sand bailing barrel further comprises a guide shoe, an inner surface of the guide shoe is in a streamline shape, and the guide shoe is connected with one end of the barrel which faces the jet negative pressure nozzle.

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