T-shaped nozzle water jet cutting plugging removal device and dredging plugging removal method

Abstract

The application belongs to the technical field of oil exploitation and blockage removal device, and particularly relates to a T-shaped nozzle water jet cutting blockage removal device and a dredging blockage removal method, aiming to solve the problem of poor flushing and dredging effect and difficulty in cleaning the pipe wall deposits of the sand control screen pipe blockage removal device in the prior art. The T-shaped nozzle water jet cutting blockage removal device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizing device and a nozzle in sequence in communication with each other. At least one T-shaped nozzle is arranged on the nozzle peripheral wall. The T-shaped nozzle comprises a main stem pipe and two branch stem pipes. One end of the main stem pipe is in conductive connection with the nozzle, and the two branch stem pipes are in conductive connection with the end portions of the main stem pipe away from the nozzle, and the two branch stem pipes are arranged in opposite directions along the same straight line. The end of the main stem pipe away from the nozzle is provided with a first jet port, and the end portions of the two branch stem pipes away from each other are provided with second jet ports. The application has the advantages of higher dredging effect, and the pipe wall deposits can be removed more easily.

Description

Technical Field

[0001] This invention belongs to the technical field of oil extraction unblocking devices, specifically relating to a T-shaped nozzle water jet cutting unblocking device and a dredging and unblocking method. Background Technology

[0002] In the process of oil extraction, sand control is an indispensable part of the development of sand-producing oil and gas reservoirs. Sand control screens are currently the most commonly used method for sand control in oil wells. After a period of production, fine sand, mud, bituminous resins in the formation fluid, as well as residual solid particles in the drilling fluid, can clog the screens and the annular sand layer outside the screens, causing well blockage and a significant decrease in production.

[0003] Common existing sand screen unclogging devices typically employ a rotatable nozzle with nozzle holes on its circumferential wall. When the nozzle rotates at high speed, the nozzle holes propel water towards the inner wall of the screen tube, achieving the effect of flushing, clearing silt, and unclogging. However, existing sand screen unclogging devices use a surface-to-interior flushing method to clean the screen tube wall. This flushing method has certain drawbacks. For example, after flushing away a certain thickness of silt, the flushing effect of the water flow decreases. Moreover, the flushing water flow compresses the silt, causing the silt near the screen tube wall to adhere more tightly, making it more difficult to thoroughly clean. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, namely the poor flushing and sludge removal effect and the difficulty in removing sludge from the pipe wall in existing sand screen pipe unblocking devices, this application provides a T-shaped nozzle water jet cutting and unblocking device, comprising a high-pressure jet pump, a packer, a downhole filter, a centralizing device, and a nozzle connected in sequence internally;

[0005] The nozzle has at least one T-shaped nozzle on its peripheral wall;

[0006] The T-shaped nozzle includes a main pipe and two branch pipes;

[0007] One end of the main pipe is connected to the nozzle, and the two branch pipes are respectively connected to the ends of the main pipe away from the nozzle, and the two branch pipes are arranged opposite each other along the same straight line.

[0008] The main pipe has a first spray port at the end furthest from the nozzle, and the two branch pipes have second spray ports at their opposite ends.

[0009] When the inner wall of the sand control screen needs to be dredged and unblocked, the T-shaped nozzle water jet cutting unblocking device is first inserted into the sand control screen, then the high-pressure jet pump pumps the high-speed flow of unblocking liquid to the nozzle, the packer separates the high-pressure jet pump from the nozzle, and the downhole filter prevents the T-shaped nozzle from being blocked by the accumulated material. The high-speed flow of unblocking liquid first cuts the inner wall of the sand control screen through the first jet port of the main stem of the T-shaped nozzle to form a strip-shaped gap, then the T-shaped nozzle is moved along the strip-shaped gap, and the second jet port of the branch stem of the T-shaped nozzle is used to cut the bottom wall of the strip-shaped gap vertically, so that the accumulated material attached to the wall of the sand control screen can be "cut" down to a certain thickness.

[0010] Compared with the existing sand control screen unblocking device which uses a water jet to flush and unblock through a jet port, the T-shaped nozzle water jet cutting unblocking device provided by the application can "cut" the accumulated material attached to the wall of the sand control screen down to a certain thickness in a manner similar to water jet cutting, which has a more efficient dredging effect, especially for removing the accumulated material on the wall.

[0011] In some preferred technical solutions, the T-shaped nozzle is further provided with a switch valve.

[0012] The switch valve is used to adjust and change the jetting state of the first jet port and the second jet port.

[0013] The switch valve can be specifically an electromagnetic valve, and one electromagnetic valve can be arranged in each of the main stem and the branch stem, so that by controlling the opening and closing of the electromagnetic valve, the jetting state of the first jet port and the second jet port can be flexibly controlled and changed.

[0014] In some preferred technical solutions, the T-shaped nozzle is provided with a cylindrical mounting cavity at the intersection of the main stem and the branch stem.

[0015] The switch valve includes a cylindrical valve core arranged in the cylindrical mounting cavity and a driving member for driving the cylindrical valve core to rotate.

[0016] The driving member can drive the cylindrical valve core to rotate in the cylindrical mounting cavity to change the conduction state of the main stem and the branch stem.

[0017] In this way, the cylindrical valve core is driven to rotate in the cylindrical mounting cavity by the driving member, so that the conduction state of the main stem and the branch stem can be adjusted and controlled simultaneously by one switch valve, which has the advantages of simplifying the structure of the T-shaped nozzle and saving production costs.

[0018] In some preferred technical solutions, a T-shaped flow channel is formed in the cylindrical valve core.

[0019] The T-shaped flow channel can be correspondingly connected with the flow channels in the main stem pipe and the two branch stem pipes.

[0020] The columnar valve core is specifically arranged, which has the advantages of simple structure and convenient control of the on-off state of the main stem pipe and the two branch stem pipes.

[0021] In some preferred technical solutions, the spray head is further provided with a driving device in transmission connection with the main stem pipe.

[0022] The driving device can drive the main stem pipe to rotate around the axis thereof.

[0023] In this way, the orientation of the second spray opening of the two branch stem pipes can be flexibly adjusted by the driving device, so that the two branch stem pipes can rotate around the axis of the main stem pipe and simultaneously spray, and the cutting range of the accumulated material on the pipe wall of the sand control screen pipe can be more flexibly adjusted.

[0024] In some preferred technical solutions, the first spray opening is arranged in an expanding shape with gradually increasing diameter along the outflow direction of the high-pressure water jet.

[0025] In this way, when the accumulated material on the inner pipe wall of the sand control screen pipe is preliminarily cut into a strip-shaped gap by the first spray opening, the width of the strip-shaped gap can be larger, and the subsequent reset movement of the T-shaped spray pipe along the strip-shaped gap can be more convenient.

[0026] In some preferred technical solutions, the second spray opening is arranged in a converging shape with gradually decreasing diameter along the outflow direction of the high-pressure water jet.

[0027] In this way, when the side wall of the strip-shaped gap is excavated and cut by the second spray opening, the effective cutting lift of the second spray opening can be farther, so that the cutting efficiency of the accumulated material can be improved.

[0028] In some preferred technical solutions, a plurality of T-shaped spray pipes are uniformly and spacedly arranged along the peripheral wall of the spray head.

[0029] In this way, when the spray head performs dredging and unblocking on the accumulated material on the inner pipe wall of the sand control screen pipe, the spray head only needs to be rotated by a certain angle or even does not need to be rotated during the lifting movement, and the inner pipe wall of the sand control screen pipe can be simultaneously cut and dredged in the circumferential direction by the simultaneous spraying of high-speed cutting water flow of the plurality of T-shaped spray pipes.

[0030] In some preferred technical solutions, the T-shaped spray pipe water jet cutting and unblocking device further comprises a driving motor in transmission connection with the spray head.

[0031] The driving motor can drive the spray head to rotate around the axis thereof.

[0032] When the nozzle drives the T-shaped nozzle to move up and down along the inner wall of the sand screen, the actual movement trajectory of the T-shaped nozzle is a spiral up and down. The effective dredging and cutting area of ​​the second spray port of the branch pipe in the T-shaped nozzle is a spiral band, which can make the dredging efficiency of the T-shaped nozzle water jet cutting and unblocking device more efficient.

[0033] The second aspect of this application provides a method for clearing and unclogging sand control screens, applicable to the T-shaped nozzle water jet cutting and unclogging device described in any of the above technical solutions, comprising the following steps:

[0034] Drive the nozzle to move along the inner wall of the sand screen pipe and open the main pipe in the T-shaped nozzle so that it cuts the sediment on the inner wall of the sand screen pipe into a strip-shaped gap.

[0035] Rotate the T-shaped nozzle so that the branch pipe in the T-shaped nozzle is perpendicular to the bottom sidewall of the strip-shaped slit;

[0036] Close the main pipe, open the branch pipe in the T-shaped nozzle, and drive the nozzle to move back along the inner wall of the sand screen pipe.

[0037] This method can be used in the above-mentioned T-shaped nozzle water jet cutting and unblocking device, and has the advantages of good flushing and sludge removal effect and easier removal of sludge deposits on the pipe wall. Attached Figure Description

[0038] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the overall structure of a T-shaped nozzle water jet cutting and unblocking device according to an embodiment of the present invention;

[0040] Figure 2 This is a partial structural schematic diagram of the T-shaped nozzle water jet cutting and unblocking device in one embodiment of the present invention;

[0041] Figure 3 This is a front view of a T-shaped nozzle water jet cutting and unblocking device according to one embodiment of the present invention;

[0042] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0043] Figure 5 A three-dimensional structural diagram of the T-shaped nozzle in the T-shaped nozzle water jet cutting and unblocking device provided in the embodiments of this application;

[0044] Figure 6 for Figure 5 A cross-sectional view of the T-shaped nozzle in its first position;

[0045] Figure 7 For Figure 5 Cross-sectional view of the T-shaped nozzle in the second state;

[0046] Figure 8 Flow chart of the dredging and plugging removal method for the sand control screen provided by the embodiments of the present application.

[0047] List of reference signs:

[0048] 1-high pressure jet pump; 2-packer; 3-downhole filter; 4-centralizing device; 5-nozzle, 51-T-shaped nozzle, 511-main stem, 511a-first jet port, 512-branch stem, 512a-second jet port, 513-switching valve, 6-driving motor. DETAILED DESCRIPTION

[0049] In order to make the embodiments, technical solutions and advantages of the present application more obvious, the technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0050] The T-shaped nozzle water jet cutting plugging removal device of the present application comprises, in sequence from inside, a high pressure jet pump, a packer, a downhole filter, a centralizing device and a nozzle;

[0051] Among them, the peripheral wall of the nozzle is provided with at least one T-shaped nozzle;

[0052] The T-shaped nozzle comprises a main stem and two branch stems;

[0053] One end of the main stem is in conductive connection with the nozzle, and two branch stems are in conductive connection with the end portions of the main stem away from the nozzle, and the two branch stems are arranged in opposite directions along the same straight line.

[0054] The end of the main stem away from the nozzle is provided with a first jet port, and the end portions of the two branch stems away from each other are provided with second jet ports. The first jet port and the second jet port are arranged orthogonally.

[0055] In order to more clearly describe the T-shaped nozzle water jet cutting plugging removal device of the present application, a preferred embodiment of the present application will be described in detail below in conjunction with the drawings.

[0056] As a preferred embodiment of the present application, the T-shaped nozzle water jet cutting plugging removal device of the present application is as shown in Figure 1 and Figure 2As shown, the embodiment of the present application provides a T-shaped nozzle water jet cutting plugging device, which comprises a high-pressure jet pump 1, a packer 2, a downhole filter 3, a centralizer 4 and a nozzle 5 which are sequentially communicated; wherein the peripheral wall of the nozzle 5 is provided with at least one T-shaped nozzle 51; the T-shaped nozzle 51 comprises a main stem 511 and two branch stems 512; one end of the main stem 511 is in conductive connection with the nozzle 5, and the two branch stems 512 are in conductive connection with the end of the main stem 511 away from the nozzle 5, and the two branch stems 512 are arranged in opposite directions along the same straight line; the end of the main stem 511 away from the nozzle 5 is provided with a first jet port 511a, and the end of the two branch stems 512 away from each other is provided with a second jet port 512a.

[0057] In addition, as Figure 8 As shown, the present application also provides a method for dredging and plugging of sand control screen, which can be applied to the above-mentioned T-shaped nozzle water jet cutting plugging device, which comprises the following steps:

[0058] The first step S1 is to drive the nozzle 5 to move along the inner wall of the sand control screen, and to open the main stem 511 in the T-shaped nozzle 51 so that it cuts the accumulated material on the inner wall of the sand control screen into a strip-shaped gap;

[0059] The second step S2 is to rotate the T-shaped nozzle 51 so that the branch stem 512 in the T-shaped nozzle 51 is perpendicular to the bottom side wall of the strip-shaped gap;

[0060] The third step S3 is to close the main stem 511, open the branch stem 512 in the T-shaped nozzle 51, and drive the nozzle 5 to reset and move along the inner wall of the sand control screen.

[0061] The working process of the T-shaped nozzle water jet cutting plugging device and the method for dredging and plugging of sand control screen will be further described in detail. When it is necessary to dredge and plug the inner wall of the sand control screen, first, the T-shaped nozzle water jet cutting plugging device is inserted into the sand control screen, and then the high-pressure jet pump 1 pumps the high-speed flowing plugging liquid to the nozzle 5, the packer 2 can separate the high-pressure jet pump 1 from the nozzle 5, the downhole filter 3 is used to prevent the accumulated material from plugging the T-shaped nozzle 51, the high-speed flowing plugging liquid first cuts the inner wall of the sand control screen into a strip-shaped gap through the first jet port 511a of the main stem 511 in the T-shaped nozzle 51, and then resets and moves the T-shaped nozzle 51 along the strip-shaped gap, and cuts the accumulated material on the inner wall of the sand control screen vertically through the second jet port 512a of the branch stem 512 in the T-shaped nozzle 51, so that the accumulated material on the inner wall of the sand control screen can be "cut" down to a certain thickness.

[0062] Compared with the existing sand screen pipe plugging device which flushes and unblocks through the water flow of the jet hole, the T-shaped jet pipe water jet cutting and unblocking device provided by the embodiment of the application can cut the wall of the sand screen pipe in a certain thickness in a manner similar to water jet cutting, has a more efficient dredging effect, and can more easily remove the wall deposits.

[0063] Preferably, the centralizer 4 of the application comprises a plurality of centralizing ribs uniformly distributed in the circumferential direction, and gaps between adjacent two centralizing ribs. In some preferred embodiments, the centralizing ribs are asymmetrically arcuate structures, and the arcuate portions of adjacent two asymmetrically arcuate structures are arranged staggered. In other preferred embodiments, each centralizing rib is a C-shaped structure with the opening direction facing the axial direction of the T-shaped jet pipe water jet cutting and unblocking device, and the two ends of the C-shaped structure are fixed along the length direction of the T-shaped jet pipe water jet cutting and unblocking device.

[0064] In an optional solution of the embodiment, the T-shaped jet pipe 51 is further provided with a switch valve 513; the switch valve 513 is used for adjusting and changing the jetting state of the first jetting port 511a and the second jetting port 512a.

[0065] Specifically, as shown in Figure 3 and Figure 4 , the T-shaped jet pipe 51 is provided with the switch valve 513, the jetting state of the first jetting port 511a and the second jetting port 512a is adjusted and changed through the switch valve 513, the switch valve 513 can be specifically an electromagnetic valve, and one can be arranged in the main stem pipe 511 and the branch stem pipe 512, so that the function of flexibly controlling and changing the jetting state of the first jetting port 511a and the second jetting port 512a can be realized by controlling the opening and closing of the electromagnetic valve.

[0066] In an optional solution of the embodiment, the T-shaped jet pipe 51 is provided with a cylindrical mounting cavity at the intersection of the main stem pipe 511 and the branch stem pipe 512; the switch valve 513 comprises a cylindrical valve core arranged in the cylindrical mounting cavity and a driving member for driving the cylindrical valve core to rotate; the driving member can drive the cylindrical valve core to rotate in the cylindrical mounting cavity to change the conduction state of the main stem pipe 511 and the branch stem pipe 512.

[0067] Specifically, as shown in Figure 5 , Figure 6 and Figure 7 , a cylindrical mounting cavity is opened at the intersection of the main stem pipe 511 and the branch stem pipe 512 of the T-shaped jet pipe 51, and the cylindrical valve core in the switch valve 513 is arranged in the cylindrical mounting cavity, so that the conduction state of the main stem pipe 511 and the branch stem pipe 512 can be simultaneously adjusted and controlled through the driving member to drive the cylindrical valve core to rotate in the cylindrical mounting cavity through one switch valve 513, which has the advantages of being capable of simplifying the structure of the T-shaped jet pipe 51 and saving production cost.

[0068] In an optional solution of the embodiment, a T-shaped flow channel is arranged in the columnar valve core; the T-shaped flow channel can be correspondingly communicated with the flow channels in the main stem pipe 511 and the two branch stem pipes 512.

[0069] Specifically, as shown in Figure 5 、 Figure 6 and Figure 7 , a T-shaped flow channel is arranged in the columnar valve core, and the T-shaped flow channel is correspondingly communicated with the flow channels in the main stem pipe 511 and the two branch stem pipes 512, Figure 6 , when the T-shaped nozzle is in the first state, at this time, the main stem pipe 511 is not communicated, and the two branch stem pipes 512 are communicated; Figure 7 , when the T-shaped nozzle is in the second state, at this time, the main stem pipe 511 is communicated, and the two branch stem pipes 512 are not communicated.

[0070] The specific arrangement mode of the columnar valve core has the advantages of simple structure and convenient control of the communication states of the main stem pipe 511 and the two branch stem pipes 512.

[0071] In an optional solution of the embodiment, the spray head 5 is further provided with a driving device in transmission connection with the main stem pipe 511; the driving device can drive the main stem pipe 511 to rotate around the axis thereof.

[0072] The driving device in transmission connection with the main stem pipe 511 is arranged in the spray head 5, and the main stem pipe 511 is driven by the driving device to rotate around the axis thereof, so that the orientation of the second spray port 512a of the two branch stem pipes 512 can be flexibly adjusted by the driving device, thereby enabling the two branch stem pipes 512 to rotate around the axis of the main stem pipe 511 and simultaneously spray, and the cutting range of the accumulated deposits on the pipe wall of the sand control screen pipe can be more flexibly adjusted.

[0073] In an optional solution of the embodiment, the first spray port 511a is arranged in an expanding shape with gradually increasing caliber along the outflow direction of the high-pressure water jet.

[0074] The first spray port 511a of the main stem pipe 511 is arranged in an expanding shape with gradually increasing caliber along the outflow direction of the high-pressure water jet, so that when the accumulated deposits on the inner pipe wall of the sand control screen pipe are preliminarily cut into a strip-shaped gap by the first spray port 511a, the width of the strip-shaped gap can be larger, and the subsequent reset movement of the T-shaped nozzle 51 along the strip-shaped gap is more convenient.

[0075] In an optional solution of the embodiment, the second spray port 512a is arranged in a contracting shape with gradually decreasing caliber along the outflow direction of the high-pressure water jet.

[0076] The second jetting port 512a of the branch pipe 511 is arranged in a gradually reduced caliber conical shape along the outflow direction of the high-pressure water jet, so that when the second jetting port 512a is used to excavate and cut the side wall of the strip-shaped gap, the effective cutting lift of the second jetting port 512a can be farther, thereby improving the cutting efficiency of the accumulated material.

[0077] In an optional embodiment of the present embodiment, the T-shaped nozzle 51 is uniformly and spacedly arranged along the peripheral wall of the nozzle 5.

[0078] Specifically, as shown in the figure, Figure 4 at this time, 6 T-shaped nozzles 51 are uniformly and spacedly arranged along the peripheral wall of the nozzle 5, so that when the nozzle 5 is used to dredge and unblock the accumulated material on the inner wall of the sand control screen pipe, the nozzle 5 only needs to rotate a certain angle or even does not need to rotate when ascending and descending, and the high-speed cutting water flow of the 6 T-shaped nozzles 51 can simultaneously cut and dredge the inner wall of the sand control screen pipe in the circumferential direction.

[0079] In an optional embodiment of the present embodiment, the T-shaped nozzle water jet cutting and unblocking device further comprises a driving motor 6 in transmission connection with the nozzle 5; the driving motor 6 can drive the nozzle 5 to rotate around the axis thereof.

[0080] Specifically, as shown in the figure, Figure 2 the nozzle 5 is driven by the driving motor 6 to rotate around the axis thereof, so that when the nozzle 5 drives the T-shaped nozzle 51 to ascend and descend along the inner wall of the sand control screen pipe, the actual motion track of the T-shaped nozzle 51 is helical ascending and descending, and the effective dredging and cutting area of the second jetting port 512a of the branch pipe 511 in the T-shaped nozzle is a helical strip, thereby making the dredging efficiency of the T-shaped nozzle water jet cutting and unblocking device higher.

[0081] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or position relationship are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0082] In addition, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0083] The term "comprising" or any other similar word is intended to encompass a non-exclusive inclusion, so that a process, article, or equipment / device including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent elements of these processes, articles, or equipment / devices.

[0084] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will fall within the protection scope of the present application.

Claims

1. A T-shaped nozzle water jet cutting unblocking device, characterized in that, The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside.

2. The T-shaped nozzle water jet cutting unblocking device according to claim 1, characterized in that, The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside.

3. The T-shaped nozzle water jet cutting unblocking device according to claim 1, characterized in that, The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside.

4. The T-shaped nozzle water jet cutting unblocking device according to claim 1, characterized in that, The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside.

5. A method for de-clogging and de-sanding a sand screen, comprising: The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and a nozzle which are sequentially connected in the inside. The T-shaped nozzle water jet cutting plug-removing device comprises a high-pressure jet pump, a packer, a downhole filter, a centralizer and

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