Sand blasting device

Abstract

The present application provides a sand flushing device, comprising a cylinder, a first guide member and a second guide member; the cylinder extends along a first direction, the cylinder comprises a common part and a drainage part, the common part is provided with a water inlet and a drain, and the drainage part is provided with a filter hole; a first water outlet cavity is provided in the first guide member, a water inlet cavity is provided between the first guide member and the cylinder; a drainage cavity is provided between the second guide member and the first guide member; a second water outlet cavity is provided between the second guide member and the drainage part; a first channel and a second channel are provided in the second guide member, and a connecting channel is provided in the second guide member; the second water outlet cavity is connected to the filter hole and the drainage cavity; one end of the water inlet cavity is connected to the water inlet, and the other end is connected to the second channel, the second channel is connected to the first water outlet cavity, and is connected to the drainage cavity, so as to drain the fluid in the drainage cavity to the first water outlet cavity, and the first water outlet cavity is connected to the drain. The present application solves the problem that the sand removal by sand bailing method takes a long time and has low sand removal efficiency.

Description

Technical Field

[0001] The present application relates to the field of downhole operations of oil wells, and in particular to a sand flushing device. Background Art

[0002] An oil well is a hole formed for the extraction of oil, and is a channel for oil to rise from the bottom of the well to the wellhead. During the formation and operation of an oil well, sand will be produced in the oil well, and the sand in the oil well will gradually settle, thus clogging the oil well.

[0003] Currently, sand can be removed from oil wells by bailing out the sand, thereby reducing the possibility of sand clogging the oil wells. However, the sand removal method takes a long time and has low efficiency. Summary of the invention

[0004] The embodiment of the present application provides a sand flushing device to solve the problem that the sand removal by the sand bailing method takes a long time and has low sand removal efficiency.

[0005] The sand flushing device provided in the embodiment of the present application includes a cylinder, a first flow guide and a second flow guide;

[0006] The cylinder extends along a first direction and is used to accommodate the first flow guide member and the second flow guide member. The cylinder includes a common portion and a drainage portion arranged along the first direction. The common portion is provided with a water inlet and a drain port, and the drainage portion is provided with a filtering hole.

[0007] In the first direction, the first flow guide is arranged between the common part and the flow guide part, a first water outlet cavity is arranged in the first flow guide, and a water inlet cavity is arranged between the first flow guide and the cylinder;

[0008] In the first direction, the second flow guide is arranged on a side of the first flow guide away from the common part, and a drainage cavity is arranged between the second flow guide and the first flow guide; a second water outlet cavity is arranged between the second flow guide and the drainage part; a first channel and a second channel connected to each other are arranged in the second flow guide, the second channel is arranged on a side of the first channel close to the first flow guide, and a connecting channel is also arranged in the second flow guide;

[0009] The second water outlet cavity is connected to the filter hole, and is connected to the drainage cavity through the connecting channel;

[0010] One end of the water inlet cavity is connected to the water inlet, and the other end is connected to the second channel through the first channel. The second channel is connected to the first water outlet cavity and the drainage cavity to drain the fluid in the drainage cavity into the first water outlet cavity. The first water outlet cavity is connected to the drain port.

[0011] By adopting the above technical scheme, when the sand flushing device is used to remove sand from the wellbore, the sand flushing device is placed in the wellbore, and the common part is close to the wellhead of the wellbore, and the jet part is located at the bottom of the wellbore; then the fluid is injected into the water inlet chamber through the water inlet, so that the fluid flows to the second channel through the water inlet chamber and the first channel in sequence, and then flows to the first water outlet chamber through the second channel, and at the same time, a negative pressure state can be formed in the drainage chamber, so that the fluid and sand outside the cylinder can enter the second water outlet chamber through the filter hole, and enter the drainage chamber through the connecting channel, and then can be drained into the first water outlet chamber through the drainage chamber, and discharged through the drain port, so as to replace the sand bailing method, shorten the time required for sand removal, and improve the sand removal efficiency.

[0012] It is further configured that the cylinder further includes a jet portion, the jet portion is arranged on a side of the drainage portion away from the common portion, and the jet portion is provided with a jet port;

[0013] A third channel is further provided in the second flow guide, and the third channel is provided on a side of the second channel away from the first flow guide and connected to the first channel;

[0014] One end of the third channel away from the first channel is connected to the jet port, so that the fluid in the water inlet cavity can flow to the jet port through the first channel and the third channel in sequence, and be discharged from the cylinder through the jet port.

[0015] It is further configured that, in the first direction, a third flow guide is provided on a side of the first flow guide away from the second flow guide;

[0016] A drainage cavity is provided between the third flow guide and the cylinder, a first end of the drainage cavity is connected to the first water outlet cavity, and a second end of the drainage cavity is connected to the drainage port;

[0017] A water inlet channel is arranged in the third flow guide member, a first end of the water inlet channel is connected to the water inlet, and a second end of the water inlet channel is connected to the water inlet cavity.

[0018] It is further configured that the first flow guide is provided with a first hole and a second hole, the first hole is used to connect the water inlet channel and the water inlet cavity; the second hole is used to connect the first water outlet cavity and the drainage cavity.

[0019] It is further configured that the first flow guide is provided with a recessed portion, and the second flow guide is provided with a raised portion, the raised portion is close to the recessed portion, and forms a gap with the recessed portion, and the gap is used to connect the drainage cavity and the first water outlet cavity.

[0020] It is further configured that the first flow guide member includes a first functional part, a second functional part and a throat; the first functional part and the second functional part are arranged along a first direction, the throat is arranged inside the first functional part and the second functional part, and the first end of the throat is connected to the first functional part, and the second end of the throat is connected to the second functional part.

[0021] It is further configured that the first functional part and the second functional part are detachably connected, and an accommodating cavity is provided between the first functional part and the second functional part, and the accommodating cavity is used to accommodate the throat.

[0022] It is further configured that the second flow guide member includes a main body and a nozzle, the nozzle is mounted on the main body, and the protrusion is arranged on the nozzle.

[0023] It is further configured that the first flow guide member is also provided with a connecting tube, the connecting tube is connected to the second flow guide member, and the drainage cavity is provided on the inner side of the connecting tube.

[0024] It is further configured that the jet portion is provided with a jet head, a plurality of jet channels are provided in the jet head, a first end of the jet channel is connected to the jet port, and a second end of the jet channel is connected to the outside of the jet head.

[0025] It is further configured that a plurality of filter holes are provided, and the plurality of filter holes are evenly arranged on the drainage part; the drainage part is also provided with a cleaning piece, the cleaning piece is sleeved on the outside of the drainage part, and can slide on the drainage part along the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] Figure 1 A cross-sectional view of a sand blasting device provided in an embodiment of the present application;

[0028] Figure 2 A cross-sectional view of a sand flushing device at a second angle provided in an embodiment of the present application;

[0029] Figure 3 Provided for the embodiments of this application Figure 1 A partial enlarged view of the middle A;

[0030] Figure 4 A cross-sectional view of a main body provided in an embodiment of the present application;

[0031] Figure 5 A cross-sectional view of the main body at another angle provided by an embodiment of the present application;

[0032] Figure 6 A cross-sectional view of a first functional portion provided in an embodiment of the present application;

[0033] Figure 7 A cross-sectional view from another angle of the first functional portion provided in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100, cylinder; 110, common part; 111, water inlet; 112, drain outlet; 120, drainage part; 121, filter hole; 122, cleaning part; 130, jet part; 131, jet head; 132, jet channel; 133, jet port; 210, first flow guide; 211, first functional part; 212, second functional part; 213, throat; 214, connecting cylinder; 215, first hole; 216, second hole; 217, first partition; 218, accommodating chamber; 219, recessed portion; 220, second flow guide member; 221, first channel; 222, second channel; 223, third channel; 224, connecting channel; 225, nozzle; 226, raised portion; 227, main body; 228, connecting pipe; 230, third flow guide member; 231, water inlet channel; 240, drainage chamber; 250, gap; 260, second water outlet chamber; 270, water inlet chamber; 280, drainage chamber; 290, first water outlet chamber.

[0036] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] As described in the background technology, during the formation and operation of oil wells, especially during the formation and use of low-pressure oil wells, sand will be produced in the oil wells, and the sand in the oil wells will gradually settle, thereby blocking the oil wells. At present, the sand in the oil wells can be removed from the wellhead of the oil wells by the Venturi sand bailing method, thereby reducing the possibility of sand clogging the oil wells. However, the Venturi sand bailing method takes a long time to remove sand, resulting in low efficiency of sand bailing, which in turn affects the normal use of the oil wells.

[0038] In order to solve the above-mentioned technical problems, an embodiment of the present application provides a sand flushing device, which can combine concentric continuous tube technology with sand flushing technology and be applied to scenarios such as low-pressure oil wells, so that fluid can be injected into the water inlet chamber through the water inlet, so that the fluid flows through the water inlet chamber and the first channel to the second channel in sequence, and then flows through the second channel to the first water outlet chamber. At the same time, a negative pressure state can be formed in the drainage chamber, so that the fluid with sand on the outside of the cylinder can enter the second water outlet chamber through the filter hole, and enter the drainage chamber through the connecting channel, and then can be drained into the first water outlet chamber through the drainage chamber, and discharged through the drain port, thereby replacing the traditional Venturi sand bailing method, shortening the time required for oil well sand removal, and improving the sand removal efficiency.

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0040] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0041] Reference Figure 1-Figure 3 The embodiment of the present application provides a sand flushing device, including a cylinder 100 and a guide member 200, the guide member 200 includes a first guide member 210 and a second guide member 220; the cylinder 100 is in a circular cylindrical shape, extends along a first direction, and is used to accommodate the first guide member 210 and the second guide member 220, the cylinder 100 includes a common part 110, a drainage part 120 and a jet part 130 arranged in sequence along the first direction, wherein the common part 110 is provided with a water inlet 111 and a drain port 112, so that liquid water and other fluids can be introduced into the cylinder 100 through the water inlet 111, and the fluid and sand in the cylinder 100 can be discharged together through the drain port 112, thereby achieving the purpose of sand removal; the drainage part 120 is provided with a filtering hole 121 for sand and fluid outside the cylinder 100 to enter the cylinder 100, and the jet part 130 is provided with a jet port 133, so that the fluid can be discharged into the cylinder 100.

[0042] It is easy to understand that in the embodiment of the present application, the common part 110, the drainage part 120 and the jet part 130 can be connected in a variety of ways, for example, they can be set to be integrally formed, or the two ends of the drainage part 120 are respectively threadedly connected to the common part 110 and the jet part 130 to form the cylinder 100, and the embodiment of the present application is not limited to this.

[0043] When the wellbore extends in the vertical direction, the sand flushing device is placed in the wellbore, and the common part 110 is close to the wellhead of the wellbore, and the jet part 130 is located at the bottom of the wellbore, so that the sand removal device can be used to remove sand. At this time, the first direction is set to the vertical direction. The specific structure of the sand flushing device is described below by taking the first direction as the vertical direction as an example.

[0044] Combine the following Figure 1-Figure 7 The first guide member 210 and the second guide member 220 are described. For example, in the first direction, the first guide member 210 is arranged between the common part 110 and the drainage part 120, a first water outlet cavity 290 is arranged in the first guide member 210, and a water inlet cavity 270 is also arranged between the first guide member 210 and the cylinder 100; in the first direction, the second guide member 220 is arranged on a side of the first guide member 210 away from the common part 110, that is, it is arranged below the first guide member 210, and a drainage cavity 240 is arranged between the second guide member 220 and the first guide member 210; a second water outlet cavity 290 is formed between the second guide member 220 and the drainage part 120. Two water outlet chambers 260; a first channel 221 and a second channel 222 are connected to each other in the second flow guide member 220, and the second channel 222 is arranged on a side of the first channel 221 close to the first flow guide member 210, that is, it is arranged above the first channel 221, and a connecting channel 224 is also arranged in the second flow guide member 220; a third channel 223 is also arranged in the second flow guide member 220, and the third channel 223 is arranged on a side of the second channel 222 away from the first flow guide member 210, that is, it is arranged below the second channel 222, and is connected to the first channel 221, so that part of the fluid in the first channel 221 can flow into the third channel 223.

[0045] The second water outlet cavity 260 is connected to the filter hole 121 and is connected to the drainage cavity 240 through the connecting channel 224, so that the fluid and sand outside the cylinder 100 can flow into the drainage cavity 240 through the filter hole 121 and the connecting channel 224 in sequence;

[0046] One end of the water inlet chamber 270 is connected to the water inlet 111, and the other end is connected to the second channel 222 through the first channel 221, and the second channel 222 is connected to the first water outlet chamber 290 and the drainage chamber 240, so that the fluid in the water inlet chamber 270 can flow into the first water outlet chamber 290 through the first channel 221 and the second channel 222 in sequence, and the fluid and sand in the drainage chamber 240 can be drained into the first water outlet chamber 290, and the first water outlet chamber 290 is connected to the drain port 112, so that the fluid and sand can be discharged from the cylinder 100 through the drain port 112.

[0047] One end of the third channel 223 away from the first channel 221 is connected to the jet port 133 , so that part of the fluid in the water inlet cavity 270 can flow to the jet port 133 through the first channel 221 and the third channel 223 in sequence, and be discharged from the cylinder 100 through the jet port 133 .

[0048] It is worth mentioning that the fluid introduced into the water inlet chamber 270 through the water inlet 111 needs to maintain a certain water pressure, so as to ensure that the fluid can have a certain flow rate in the process of entering the first water outlet chamber 290 through the second channel 222, so as to drain the fluid and sand in the drainage chamber 240 into the first water outlet chamber 290. And illustratively, the first channel 221 can extend in the horizontal direction, and the first channel 221 can be provided in plurality, and the plurality of first channels 221 are uniformly arranged along the circumference of the second channel 222, and are all connected to the second channel 222, and the second channel 222 and the third channel 223 can extend in the vertical direction and be coaxially arranged.

[0049] By adopting the above technical solution, when the sand flushing device is used to remove sand from the wellbore, the sand flushing device is placed in the wellbore, and the common part 110 is close to the wellhead of the wellbore, and the jet part 130 is located at the bottom of the wellbore; a fluid with a certain water pressure is introduced into the water inlet chamber 270 through the water inlet 111, so that part of the fluid flows to the second channel 222 through the water inlet chamber 270 and the first channel 221 in turn, and then flows upward to the first water outlet chamber 290 through the second channel 222, and at the same time, a negative pressure state can be formed in the drainage chamber 240, so that the fluid with sand on the outside of the cylinder 100 can enter the second water outlet chamber 260 through the filter hole 121, and enter the drainage chamber 240 upward through the connecting channel 224, and then can be drained to the first water outlet chamber 290 through the drainage chamber 240, and discharged through the drain port 112;

[0050] When part of the fluid flows into the second channel 222 through the first channel 221, another part of the fluid flows into the third channel through the first channel, and then flows to the jet port 133, and is discharged from the barrel 100 through the jet port 133 to achieve the effect of flushing the wellbore.

[0051] Reference Figure 1-Figure 3 In the embodiment of the present application, in the first direction, the third flow guide member 230 is arranged on the side of the first flow guide member 210 away from the second flow guide member 220, that is, above the first flow guide member 210, and the third flow guide member 230 is arranged corresponding to the common part 110. Exemplarily, the third flow guide member 230, the first flow guide member 210 and the second flow guide member 220 are coaxially arranged along the first direction; a drainage cavity 280 is arranged between the third flow guide member 230 and the cylinder body 100, the first end of the drainage cavity 280 is connected to the first water outlet cavity 290, and the second end of the drainage cavity 280 is connected to the drainage port 112; and a water inlet channel 231 is arranged in the third flow guide member 230, the first end of the water inlet channel 231 is connected to the water inlet 111, and the second end of the water inlet channel 231 is connected to the water inlet cavity 270.

[0052] The top of the first guide member 210 is also provided with a first hole 215 and a second hole 216, wherein the first hole 215 is used to connect the water inlet channel 231 and the water inlet chamber 270; the second hole 216 is used to connect the first water outlet chamber 290 and the water outlet chamber 280, so as to utilize the first guide member 210 to play a certain transitional role. It is easy to understand that, since the water inlet chamber 270 is arranged outside the first guide member 210, the first hole 215 extends toward the outside of the first guide member 210 in a direction close to the second guide member 220; and the first water outlet chamber 290 is arranged inside the first guide member 210, so the first hole 215 extends toward the inside of the first guide member 210 in a direction close to the second guide member 220.

[0053] Exemplarily, a plurality of first holes 215 and a plurality of second holes 216 may be provided, and the plurality of first holes 215 and the plurality of second holes 216 are evenly arranged along the circumference of the water outlet cavity. In addition, the diameter of the second hole 216 should be larger than the diameter of the filter hole 121, so as to reduce the possibility of sand blocking the second hole 216.

[0054] When a fluid with a certain water pressure is introduced into the water inlet chamber 270 through the water inlet 111, the fluid flows into the water inlet channel 231 through the water inlet 111, and then flows into the first hole 215 of the first flow guide 210, and flows into the water inlet chamber 270 through the first hole 215; when the fluid containing sand is discharged from the first water outlet chamber 290, the fluid containing sand can flow to the drain port 112 through the second hole 216, and thus be discharged from the cylinder 100 through the drain port 112.

[0055] Reference Figure 1-Figure 3 , the connection relationship between the third flow guide 230, the first flow guide 210 and the second flow guide 220 is described below.

[0056] In the embodiment of the present application, the third flow guide member 230 and the first flow guide member 210 may be connected in a variety of ways. For example, the third flow guide member 230 and the first flow guide member 210 may be arranged to be threadedly connected.

[0057] Continue to refer to Figure 1-Figure 7 Exemplarily, the first flow guide 210 includes a first functional part 211, a second functional part 212 and a throat 213, the first functional part 211 and the second functional part 212 are arranged along a first direction, that is, the first functional part 211 is arranged above the second functional part 212, and the first functional part 211 and the second functional part 212 are arranged to be detachably connected, for example, the first functional part 211 and the second functional part 212 are threadedly connected; and the throat 213 is arranged inside the first functional part 211 and the second functional part 212, an accommodating cavity 218 is arranged between the first functional part 211 and the second functional part 212, the throat 213 is arranged in the accommodating cavity 218, and the first end of the throat 213 is connected to the first functional part 211, and the second end of the throat 213 is connected to the second functional part 212, so that the throat 213 can be taken out from the accommodating cavity 218, and part of the first water outlet cavity 290 is formed inside the throat 213.

[0058] It is easy to understand that, since the water inlet chamber 270 is not connected to the drainage chamber 280, a first partition 217 is provided on the first functional part 211, and the first partition 217 can be connected to the inner side of the cylinder 100, so that the water inlet chamber 270 can be separated from the drainage chamber 280 by the first partition 217; correspondingly, since the first channel 221 is not connected to the water inlet chamber 270, a second partition is also provided on the second flow guide 220, and the second partition can be connected to the inner side of the cylinder 100, so that the water inlet chamber 270 can be separated from the first channel 221 by the second partition.

[0059] Reference Figure 1-Figure 3 In the embodiment of the present application, the first flow guide 210 is further provided with a connecting tube 214, which is connected to the second flow guide 220, so that the first flow guide 210 can be connected to the second flow guide 220 through the connecting tube 214, and the drainage cavity is arranged inside the connecting tube 214. A recessed portion 219 is arranged at the bottom end of the first flow guide 210, and a raised portion 226 is arranged at the top end of the second flow guide 220. The raised portion 226 and the recessed portion 219 are both arranged inside the connecting tube 214, and the raised portion 226 is close to the recessed portion 219, and forms a gap 250 with the recessed portion 219, and the gap 250 is used to connect the drainage cavity 240 and the first water outlet cavity 290.

[0060] Reference Figure 1-Figure 5Exemplarily, the second flow guide 220 includes a main body 227 and a nozzle 225, the nozzle 225 is mounted on the main body 227, and the protrusion 226 is disposed on the nozzle 225, and the nozzle 225 is coaxially disposed with the barrel 100, and the top end of the second channel 222 is connected to the nozzle 225, so that the fluid can flow into the first water outlet chamber 290 through the nozzle 225. It is also easy to understand that the drainage chamber 240 is disposed on the inner side of the connecting barrel 214 and on the outer side of the nozzle 225.

[0061] In the embodiment of the present application, the throat 213 and the nozzle 225 are both configured as a detachable structure, so it is easy to understand that when sand of different sizes needs to be removed, it can be achieved by replacing the throat 213 with a first water outlet cavity 290 of different sizes, and replacing the nozzle 225 of different sizes, thereby being able to remove sand of different sizes in the wellbore.

[0062] By adopting the above technical solution, when installing the third guide member 230, the first guide member 210 and the second guide member 220, the second guide member 220 is placed in the barrel 100, and the second guide member 220 is fixed to the barrel 100 so that the second partition can contact the barrel 100, and then the nozzle 225 is threadedly connected to the top of the main body 227, thereby completing the installation of the nozzle 225;

[0063] Then, the throat 213 is placed between the first functional part 211 and the second functional part 212, and the first functional part 211 and the second functional part 212 are moved in a direction close to each other, and a receiving cavity 218 is formed between the first functional part 211 and the second functional part 212, and the throat 213 is arranged in the receiving cavity 218, and then the first functional part 211 and the second functional part 212 are fixed, so that the first functional part 211, the second functional part 212 and the throat 213 form a first flow guide 210;

[0064] The first flow guide member 210 is fixed on the second flow guide member 220 by threading the connecting tube 214 on the second functional part 212 with the second flow guide member 220, and the first partition part 217 is in contact with the cylinder 100, and finally the third flow guide member 230 is threadedly connected to the first flow guide member 210, so that the third flow guide member 230 can be installed on the first flow guide member 210.

[0065] Reference Figure 1-Figure 3, the structure of the jet part 130 is described below. In the embodiment of the present application, the second flow guide 220 further includes a connecting pipe 228, the first end of which is connected to the main body 227, and the other end is connected to the jet part 130 and communicates with the jet port 133; the jet part 130 is provided with a jet head 131, and a plurality of jet channels 132 are provided in the jet head 131, the first end of each jet channel 132 is connected to the jet port 133, and the second end of the jet channel 132 is connected to the outside of the jet head 131. And it is easy to understand that the jet channel 132 can be set in multiple directions, so that the fluid can be discharged to different directions in the wellbore through the multiple jet channels 132 to play the role of flushing the wellbore.

[0066] By adopting the above technical solution, when part of the fluid in the water inlet chamber 270 flows into the second channel 222 through the first channel 221, another part of the fluid flows into the third channel through the first channel, and then flows to the jet port 133, and is discharged from the barrel 100 through the jet port 133, so as to achieve the effect of flushing the wellbore.

[0067] Continue to refer to Figure 1-Figure 3 In the embodiment of the present application, a plurality of filter holes 121 are provided, and the plurality of filter holes 121 are evenly arranged on the drainage portion 120; the drainage portion 120 is also provided with a cleaning member 122, which is sleeved on the outside of the drainage portion 120 and can slide on the drainage portion 120 along the first direction, and illustratively, the outer diameter of the cleaning member 122 is greater than the outer diameter of the cylinder 100, so that it can play a certain cleaning role on the drainage portion 120 and reduce the possibility of sand clogging the filter holes 121.

[0068] By adopting the above technical solution, when the drainage chamber 240 is in a negative pressure state, and the fluid and sand outside the cylinder 100 can flow into the drainage chamber 240 through the filter holes 121 and the connecting channel 224 in turn, the filter holes 121 can be used to block larger sand on the outside of the cylinder 100, so that smaller sand and fluid can pass through the filter holes 121 into the second water outlet chamber 260, thereby reducing the possibility of larger sand clogging the second hole 216 and the connecting channel 224.

[0069] After completing the sand removal process of the wellbore, the sand flushing device is removed from the wellbore in the vertical direction so that the outer side of the cleaning member 122 can be in frictional contact with the wall of the wellbore, thereby making the cleaning member 122 slide along the first direction in the drainage portion 120, and then the cleaning member 122 can be used to clean the outer side of the drainage portion 120, thereby reducing the possibility of sand clogging the filter hole 121.

[0070] In summary, when the sand flushing device is used to remove sand from the wellbore, the sand flushing device is placed in the wellbore, and the common part 110 is close to the wellhead of the wellbore, and the jet part 130 is located at the bottom of the wellbore; when a fluid with a certain water pressure is introduced into the water inlet chamber 270 through the water inlet 111, the fluid flows into the water inlet channel 231 through the water inlet 111, and then flows into the first hole 215 of the first flow guide 210, and flows into the water inlet chamber 270 through the first hole 215, and part of the fluid flows through the water inlet chamber 270 and the first channel 221 to the second channel 222 in turn, and then flows upward through the second channel 222 to the first water outlet chamber 290, and can flow into the drainage chamber 24 0, so that the fluid with sand on the outside of the cylinder 100 can enter the second water outlet chamber 260 through the filter hole 121, and enter the drainage chamber 240 upward through the connecting channel 224, and then can be drained into the first water outlet chamber 290 through the drainage chamber 240, and discharged through the drain port 112; when part of the fluid flows into the second channel 222 through the first channel 221, the other part of the fluid flows into the third channel through the first flow channel, and then flows to the jet port 133, and is discharged from the cylinder 100 through the jet port 133, so as to achieve the effect of flushing the wellbore, thereby replacing the traditional Venturi sand bailing method, shortening the time required for oil well sand removal, and improving the sand removal efficiency.

[0071] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0072] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A sand washing device, characterized in that: It includes a cylinder, a first flow guide and a second flow guide; The cylinder extends along a first direction and is used to accommodate the first flow guide member and the second flow guide member. The cylinder includes a common part and a drainage part arranged along the first direction. The common part is provided with a water inlet and a drain port, and the drainage part is provided with a filtering hole. In the first direction, the first flow guide is arranged between the common part and the flow guide part, a first water outlet cavity is arranged in the first flow guide, and a water inlet cavity is arranged between the first flow guide and the cylinder; In the first direction, the second flow guide is arranged on a side of the first flow guide away from the common part, and a drainage cavity is arranged between the second flow guide and the first flow guide; a second water outlet cavity is arranged between the second flow guide and the drainage part; a first channel and a second channel connected to each other are arranged in the second flow guide, the second channel is arranged on a side of the first channel close to the first flow guide, and a connecting channel is also arranged in the second flow guide; The second water outlet cavity is connected to the filter hole, and is connected to the drainage cavity through the connecting channel; One end of the water inlet cavity is connected to the water inlet, and the other end is connected to the second channel through the first channel, the second channel is connected to the first water outlet cavity, and is connected to the drainage cavity to drain the fluid in the drainage cavity into the first water outlet cavity, and the first water outlet cavity is connected to the drain port; The first flow guide is further provided with a connecting tube, the connecting tube is connected to the second flow guide, and the drainage cavity is provided inside the connecting tube; The first flow guide is provided with a recessed portion, and the second flow guide is provided with a raised portion. The raised portion and the recessed portion are both arranged on the inner side of the connecting tube. The raised portion is close to the recessed portion and forms a gap with the recessed portion. The gap is used to connect the drainage cavity and the first water outlet cavity.

2. The sand washing device according to claim 1, characterized in that: The cylinder body further comprises a jet portion, which is arranged on a side of the drainage portion away from the common portion, and the jet portion is provided with a jet port; A third channel is further provided in the second flow guide, and the third channel is provided on a side of the second channel away from the first flow guide and connected to the first channel; One end of the third channel away from the first channel is connected to the jet port, so that the fluid in the water inlet cavity can flow to the jet port through the first channel and the third channel in sequence, and be discharged from the cylinder through the jet port.

3. The sand washing device according to claim 1, characterized in that: In the first direction, a third flow guide is provided on a side of the first flow guide away from the second flow guide; A drainage cavity is provided between the third flow guide and the cylinder, a first end of the drainage cavity is connected to the first water outlet cavity, and a second end of the drainage cavity is connected to the drainage port; A water inlet channel is arranged in the third flow guide member, a first end of the water inlet channel is connected to the water inlet, and a second end of the water inlet channel is connected to the water inlet cavity.

4. The sand washing device according to claim 3, characterized in that: The first flow guide is provided with a first hole and a second hole. The first hole is used to connect the water inlet channel and the water inlet cavity; the second hole is used to connect the first water outlet cavity and the drainage cavity.

5. The sand washing device according to claim 1, characterized in that: The first flow guide member includes a first functional part, a second functional part and a throat; the first functional part and the second functional part are arranged along a first direction, the throat is arranged inside the first functional part and the second functional part, and the first end of the throat is connected to the first functional part, and the second end of the throat is connected to the second functional part.

6. The sand washing device according to claim 5, characterized in that: The first functional part is detachably connected to the second functional part, and an accommodating cavity is provided between the first functional part and the second functional part, and the accommodating cavity is used to accommodate the throat; And / or, the second flow guide member includes a main body and a nozzle, the nozzle is mounted on the main body, and the protrusion is arranged on the nozzle.

7. The sand washing device according to claim 2, characterized in that: The jet part is provided with a jet head, and a plurality of jet channels are provided in the jet head. The first end of the jet channel is connected to the jet port, and the second end of the jet channel is connected to the outside of the jet head.

8. The sand flushing device according to any one of claims 1 to 7, characterized in that: There are multiple filter holes, and the multiple filter holes are evenly arranged on the drainage part; the drainage part is also provided with a cleaning piece, which is sleeved on the outside of the drainage part and can slide on the drainage part along the first direction, and the outer diameter of the cleaning piece is larger than the outer diameter of the cylinder.

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