A sand control tool for an expandable tubular open hole system

Abstract

The present invention relates to a sand control tool for an expandable tubular open hole system, which includes a vertically arranged core pipe. A sand control pipe is sleeved on the outer wall of the core pipe at intervals, and an annular chamber with both ends closed is formed by this interval. A sand control cup is sleeved and fixed on the lower outer wall of the sand control pipe, and the opening of the sand control cup faces upward. A plurality of first circulation holes and a plurality of second circulation holes are respectively formed in the pipe wall of the sand control pipe at positions above and below the sand control cup. Both the first circulation holes and the second circulation holes are communicated with the annular chamber and the outside of the sand control pipe. The sand control tool of the present invention can block the falling solid object particles, and can perform flushing operations to wash out the solid object particles when the expansion cone encounters resistance during movement, avoiding affecting the movement of the expansion cone and ensuring the smooth expansion of the expandable tubular.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling and completion in the oil and gas industry, and particularly to a sand control tool for an expandable liner open hole system. Background Art

[0002] The expandable liner technology, as an unconventional technology, was born in Shell Oil Company in the 1980s and reached the commercial level in the late 1990s, and is known as "one of the core technologies for the development of the oil industry in the 21st century". The so-called expandable liner, also known as a solid expandable liner, refers to a solid metal round tube made of special materials, which has good ductility in its original state. Under the action of the expansion force, through the extrusion and expansion of the expansion cone, both its inner diameter and outer diameter are expanded and undergo permanent plastic deformation, and the general expansion rate can reach 10-30%. The expandable liner technology is to lower the expandable liner string to the predetermined well depth position, and by mechanical or hydraulic methods, the expandable liner is expanded through tension or hydraulic pressure to achieve the purpose of enlarging the wellbore or the inner diameter of the production string, and can achieve the operation objectives such as workover, completion, and drilling plugging. The application of the expandable liner technology mainly has four technical systems: the expandable liner casing patch system (belonging to the workover field), the expandable liner hanger system (belonging to the completion field), the expandable liner open hole system (belonging to the drilling field), and the equal diameter drilling system. The expandable liner open hole system generally includes an expandable liner open hole liner technology system and an expandable liner open hole patch technology system, and can be used to handle engineering problems caused by encountering complex formations during drilling, such as the plugging of severely lost circulation formations, the plugging of easily caving formations, and the inability to reach the target formation due to conventional premature casing setting.

[0003] Such as Figure 1As shown, the tool string for an expandable open-hole system typically includes an outer expansion string and an inner expansion string, referred to as inner string 01 and outer string 02, respectively. Inner string 01 typically consists of a connecting nipple and drill pipe 011 (or tubing and drill pipe 011) arranged from bottom to top. Outer string 02 consists of a bottom plug, an expansion cone assembly, and expansion tube 021, arranged from bottom to top. The lower portion of expansion tube 021 has a pressure chamber 023. Expansion cone 022 is located within pressure chamber 023 and rests against the inner slope of expansion tube 021 corresponding to pressure chamber 023. Rubber rings with sealing and suspension functions are installed on the upper and lower outer walls of expansion tube 021. Expansion tube 021 is typically constructed by threaded, sealed connections of multiple sub-expansion tubes. During construction, inner string 01 is lowered into and docked with expansion tube 021, allowing it to be lowered and providing a high-pressure liquid channel for expansion operations. After connecting the outer tubing string 02 to the inner tubing string 01, it is lowered into the predetermined plugged section of the well. By applying pressure to the inner tubing string 01, liquid enters the pressure chamber 023, pushing the expansion cone 022 upward, thus expanding the expansion tube 021. After the expansion operation is completed, the inner tubing string 01 is automatically released and the drill is pulled out. The inner tubing string 01 and the expansion cone 022 are then pulled out together. The wellbore can then be connected by milling or fishing the bottom plug.

[0004] Currently, when running the tool string of an expandable open-hole system at a construction site, the inner and outer annuli between the inner and outer tubing strings (01) and (02) are typically filled with a viscous liquid with a suspending effect, such as a carboxymethyl cellulose (CM) solution or a xanthan gum (XC) solution. This prevents solid particles from entering the inner and outer annuli during the run-in and during the expansion of the expandable tubing (021), potentially hindering the movement of the expansion cone. However, the viscous liquid is not sealed within this annulus. Due to differences in density and composition between the drilling fluid and these viscous liquids, gravity displacement can occur, causing the viscous liquid to be lost or rendered ineffective downhole (ineffectiveness refers to a chemical reaction between the drilling fluid and the viscous liquid, rendering it less viscous). This can lead to solid particles entering the inner and outer annuli between the inner and outer tubing strings, which can even prevent the expansion cone (022) from moving and the expansion tubing (021) from expanding, resulting in serious pipe-sticking accidents.

[0005] Therefore, the inventors, relying on their many years of experience and practice in related industries, have proposed a sand control tool for an expandable tubing open hole system to overcome the defects of the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a sand control tool for an expansion tube open hole system, which can block falling solid particles and can perform flushing operations to flush out the solid particles when the movement of the expansion cone is obstructed, thereby avoiding affecting the movement of the expansion cone and ensuring the smooth expansion of the expansion tube.

[0007] The object of the present invention is achieved as follows. A sand control tool for an expandable tubular open-hole system includes a vertically arranged core pipe; a sand control pipe is sleeved on the outer wall of the core pipe at intervals, and an annular chamber with both ends closed is formed by this interval. A sand control leather cup is sleeved and fixed on the lower outer wall of the sand control pipe, and the opening of the sand control leather cup faces upward; a plurality of first circulation holes and a plurality of second circulation holes are respectively formed in the pipe wall of the sand control pipe at positions above and below the sand control leather cup, and both the first circulation holes and the second circulation holes are communicated with the annular chamber and the outside of the sand control pipe.

[0008] In a preferred embodiment of the present invention, a plurality of groups of support components are formed at intervals along the axial direction of the core pipe on the outer wall of the core pipe and within the annular chamber. Each group of support components includes a plurality of support blocks arranged at intervals along the circumferential direction of the core pipe, and the outer wall of each support block is an arc surface.

[0009] In a preferred embodiment of the present invention, the plurality of first circulation holes and the plurality of second circulation holes are respectively arranged on the upper and lower pipe walls of the sand control pipe, and are arranged at intervals along the circumferential direction of the sand control pipe.

[0010] In a preferred embodiment of the present invention, the core pipe includes an upper connection pipe and a lower connection pipe that are hermetically fixed up and down, and the sand control pipe is sleeved outside the upper connection pipe.

[0011] In a preferred embodiment of the present invention, the inner wall of the upper end of the lower connection pipe forms a first stepped hole and a second stepped hole with gradually increasing inner diameters upward. The lower end of the upper connection pipe is inserted into the first stepped hole and hermetically fixed; the outer wall of the upper part of the upper connection pipe forms a first limit step and a second limit step with gradually increasing outer diameters upward. The upper end of the sand control pipe abuts against the second limit step, the lower end of the sand control pipe is inserted into the second stepped hole and abuts against the bottom shoulder of the second stepped hole, and an annular chamber is formed between the outer wall of the upper connection pipe, the inner wall of the sand control pipe, the first limit step and the bottom shoulder of the second stepped hole.

[0012] In a preferred embodiment of the present invention, a first annular groove is formed on the outer wall of the lower end of the upper connection pipe, and a sealing ring is embedded in the first annular groove. The outer wall of the lower end of the upper connection pipe is threadedly fixed to the hole wall of the first stepped hole.

[0013] In a preferred embodiment of the present invention, an anti-rotation screw is inserted between the outer wall of the lower end of the upper connection pipe and the hole wall of the first stepped hole.

[0014] In a preferred embodiment of the present invention, the inner diameter of the upper connection pipe is the same as the inner diameter of the lower connection pipe.

[0015] In a preferred embodiment of the present invention, a leather cup seat is sleeved and fixed on the lower outer wall of the sand control pipe and below the sand control leather cup, and the sand control leather cup is fixedly connected to the leather cup seat.

[0016] In a preferred embodiment of the present invention, a second annular groove is formed on the upper end surface of the cup seat. The bottom end of the sand control cup protrudes downward to form a convex ring, and the convex ring is embedded in the second annular groove and vulcanized and fixed to the cup seat.

[0017] In a preferred embodiment of the present invention, a third limiting step with an enlarged outer diameter is formed upward on the lower outer wall of the sand control pipe. The upper end and the lower end of the cup seat respectively abut against the third limiting step and the upper end surface of the lower connecting pipe; a plurality of through grooves are formed at intervals along the circumferential direction of the pipe wall of the lower connecting pipe corresponding to the second stepped hole, and the through grooves extend upward to the top of the lower connecting pipe, and the second circulation hole is communicated with the through grooves.

[0018] In a preferred embodiment of the present invention, an internal thread is formed on the inner wall of the upper end of the upper connecting pipe, and an external thread is formed on the outer wall of the lower end of the lower connecting pipe.

[0019] As described above, the sand control tool in the present invention can resist the solid object particles falling from the space above the sand control cup during the lowering of the expansion pipe into the well and the expansion operation through the setting of the sand control cup, and does not affect the expansion operation of the expansion cone, increasing the safety of the expansion operation. If fine particles fail to be blocked by the sand control cup and fall, and the accumulation of the fine particles affects or blocks the movement of the expansion cone, the inner pipe string can be appropriately lowered and then pressured. By using the liquid circulation channel composed of the second circulation hole, the annular chamber and the first circulation hole, the solid object particles on the surface of the expansion cone or in the space above the expansion cone can be flushed out to resume the expansion operation. The whole sand control tool has a simple structure, is easy to operate, can be reused after replacing the vulnerable parts, is safe and reliable, and has a wide application prospect. Description of the Drawings

[0020] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them:

[0021] Figure 1 : is a schematic structural diagram of a tool string of an expansion pipe open hole system in the prior art.

[0022] Figure 2 : is a schematic structural diagram of the sand control tool for the expansion pipe open hole system provided by the present invention.

[0023] Figure 3 : is Figure 2 The cross-sectional view along the A-A direction in

[0024] Figure 4 : is Figure 2 The cross-sectional view along the B-B direction in

[0025] Figure 5 : is Figure 2 The cross-sectional view along the C-C direction in

[0026] Figure 6 : is the partial enlarged view along D in Figure 2 .

[0027] Figure 7 : is the structural schematic diagram of the upper connecting pipe provided by the present invention.

[0028] Figure 8 : is Figure 7 the sectional view along the E-E direction in

[0029] Figure 9 : is the structural schematic diagram of the lower connecting pipe provided by the present invention.

[0030] Figure 10 : is Figure 9 the top view of

[0031] Figure 11 : is the structural schematic diagram of the sand control cup provided by the present invention.

[0032] Figure 12 : is the structural schematic diagram of the cup seat provided by the present invention.

[0033] Figure 13 : is the structural schematic diagram of the tool string of the entire expandable tubular open hole system after the sand control tool is connected to the inner pipe string provided by the present invention.

[0034] Figure 14 : is the structural schematic diagram of the tool string of the entire expandable tubular open hole system after the inner pipe string is lowered during flushing provided by the present invention.

[0035] Explanation of the reference numerals in the drawings:

[0036] Prior art:

[0037] 01. Inner pipe string; 011. Drill pipe; 02. Outer pipe string; 021. Expandable tube; 022. Expansion cone; 023. Pressure chamber.

[0038] The present invention:

[0039] 1. Core pipe;

[0040] 11. Upper connecting pipe; 111. Support block; 112. First limiting step; 113. Second limiting step; 114. First annular groove; 115. Sealing ring; 116. Anti-rotation screw;

[0041] 12. Lower connecting pipe; 121. First stepped hole; 122. Second stepped hole; 123. Through slot;

[0042] 2. Sand control pipe; 21. First circulation hole; 22. Second circulation hole; 23. Third limiting step;

[0043] 3. Annular chamber;

[0044] 4. Sand control cup; 41. Convex ring;

[0045] 5. Cup seat; 51. Second annular groove;

[0046] 100. Inner pipe string; 101. Drill pipe;

[0047] 200. Outer pipe string; 201. Expansion pipe; 202. Expansion cone; 203. Pressure chamber. Specific implementation mode

[0048] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation mode of the present invention will now be described with reference to the accompanying drawings.

[0049] As Figures 2 to 14 shown, this embodiment provides a sand control tool for an expansion pipe open hole system, including a vertically arranged core pipe 1. A sand control pipe 2 is sleeved on the outer wall of the core pipe 1 at intervals, and this interval forms an annular chamber 3 with both ends closed. A sand control cup 4 is sleeved and fixed on the lower outer wall of the sand control pipe 2, and the opening of the sand control cup 4 faces upward. A plurality of first circulation holes 21 and a plurality of second circulation holes 22 are respectively opened on the pipe wall of the sand control pipe 2 at positions above and below the sand control cup 4. Both the first circulation holes 21 and the second circulation holes 22 are communicated with the annular chamber 3 and the outside of the sand control pipe 2.

[0050] Among them, the outer diameter specification of the entire sand control tool is selected according to the specification of the expansion pipe 201 so as to cooperate with expansion pipes 201 with different inner diameter specifications. The sand control cup 4 is made of rubber, and the outer diameter of the sand control cup 4 should be able to have an interference fit with the inner wall of the expansion pipe 201 before expansion. During installation, as Figure 13 shown, the entire sand control tool is installed inside the expansion pipe 201 and between the drill pipe strings above the expansion cone 202. The upper and lower ends of the core pipe 1 are respectively connected to the ends of the drill pipe 101 of the inner pipe string 100. The entire sand control tool serves as a part of the inner pipe string 100 (i.e., the inner pipe string of the expansion pipe). One or more sand control tools can be arranged between the drill pipe strings according to needs to improve the sand control effect. In this embodiment, taking the arrangement of one sand control tool as an example for illustration.

[0051] During use, first lower the outer pipe string 200 (i.e., the expansion pipe outer pipe string), and then lower the inner pipe string 100 with this sand control tool. After docking with the outer pipe string 200, lower them together to the predetermined plugging well section. Before the expansion operation, a cementing operation is carried out first. After the fixation is completed, during the setting stage of the cement slurry, the expansion operation is realized by pumping pressure into the inner pipe string 100. During the expansion operation, since the outer wall of the sand control cup 4 and the inner wall of the expansion pipe 201 before expansion are in an interference fit, it can resist the solid object particles falling from the space above the sand control cup 4 and will not affect the normal pipe expansion operation of the expansion cone 202. Through the action of the sand control cup 4, the solid phase particles can be basically blocked.

[0052] If there are very few fine particles that are not blocked by the sand control cup 4 and fall down, and the accumulation of these fine particles causes the expansion cone 202 to be stuck and unable to move, the inner pipe string 100 can be appropriately lowered, as Figure 14 shown, so that there is a certain gap between the expansion cone 202 and the inclined surface of the inner wall of the expansion pipe 201. Then start the pump and circulate. Pump pressure into the inner pipe string 100, and the liquid flows downward through the inner pipe string 100 into the pressure chamber 203 at the bottom of the expansion cone 202. Since the outer diameter of the expansion cone 202 is slightly smaller than the inner diameter of the expanded expansion pipe 201, there is a certain gap between the expansion cone 202 and the inner wall of the expanded expansion pipe 201 below. Therefore, after the high-pressure liquid flows into the bottom of the expansion cone 202, it will flow out through the gap between the expansion cone 202 and the inner wall of the expanded expansion pipe 201 below and the gap between the expansion cone 202 and the inclined surface of the inner wall of the expansion pipe 201, and then return upward; then it flows into the annular chamber 3 through the second circulation hole 22 below the sand control cup 4 and flows out from the first circulation hole 21 above the sand control cup 4 into the inner annular space between the inner pipe string 100 and the outer pipe string 200, achieving the purpose of flushing the surface of the expansion cone 202 and the space above the expansion cone 202, so as to discharge the solid object particles entering the expansion pipe 201 from the expansion pipe 201, resume the expansion operation, and continue to expand the expansion pipe 201 until the construction is completed to meet the requirements of the on-site construction operation of the expansion pipe open-hole system.

[0053] When the expansion operation of the expansion pipe 201 is completed, the inner pipe string 100 is automatically released, and the drill string is pulled out. The sand control tool is pulled out of the wellhead together with the inner pipe string 100. If components such as the sand control cup 4 are not damaged, they can be reused after cleaning, inspection, and maintenance. It should be noted that due to the existence of the sand control cup 4, basically only fine particles fall on the expansion cone 202, and there are hardly any large particles. Therefore, the relatively small apertures of the above-mentioned first circulation hole 21 and second circulation hole 22 can also meet the flushing requirements, and generally the flow rate of the flushing fluid is not too large during flushing to avoid too high pump pressure.

[0054] Thus, the sand control tool in this embodiment can prevent solid object particles falling from the space above the sand control cup 4 when being lowered into the well under the expansion pipe 201 and during the expansion operation through the setting of the sand control cup 4, and it will not affect the expansion operation of the expansion cone 202, increasing the safety of the expansion operation. If there are small particles that cannot be blocked by the sand control cup 4 and fall, and the accumulation of the small particles affects or blocks the movement of the expansion cone 202, the inner pipe string 100 can be appropriately lowered and then pressured. By using the liquid circulation channel composed of the second circulation hole 22, the annular chamber 3, and the first circulation hole 21, the solid object particles on the surface of the expansion cone 202 or in the space above the expansion cone 202 can be flushed out to resume the expansion operation. The entire sand control tool has a simple structure, is easy to operate, can be reused after replacing the vulnerable parts, is safe and reliable, and has a wide application prospect.

[0055] In a specific implementation manner, since the general sand control pipe 2 is relatively long, for the convenience of installing the sand control pipe 2, as Figure 2 , Figure 4 , Figure 7 and Figure 8 shown, multiple groups of support components are formed at intervals along the axial direction on the outer wall of the core pipe 1 and within the annular chamber 3. Each group of support components includes a plurality of support blocks 111 arranged at intervals along the circumferential direction of the core pipe 1, and the outer wall of each support block 111 is an arc surface (an arc surface extending along the circumferential direction of the core pipe 1).

[0056] Among them, the outer wall of each support block 111 is in clearance fit with the inner wall of the sand control pipe 2, playing a certain supporting role for the sand control pipe 2. At the same time, the intervals between the support blocks 111 communicate with the annular chamber 3 and can serve as a liquid circulation channel. The number of groups of support components and the number of support blocks 111 are determined according to actual needs. For example, in this embodiment, a total of two groups of support components are provided, and each group of support components includes four support blocks 111 arranged at uniform intervals.

[0057] In practical applications, to ensure that the sand control tool has sufficient strength, as Figure 2 shown, a plurality of first circulation holes 21 and a plurality of second circulation holes 22 are respectively arranged on the upper and lower pipe walls of the sand control pipe 2 and are arranged at intervals along the circumferential direction of the sand control pipe 2. Of course, when the strength requirements are met, according to needs, a plurality of first circulation holes 21 can also be arranged at other positions on the upper pipe wall of the sand control pipe 2 and a plurality of second circulation holes 22 can be arranged at other positions on the lower pipe wall of the sand control pipe 2. This embodiment is only for illustrative purposes.

[0058] Furthermore, for the convenience of processing and installation, as Figure 2 shown, the core pipe 1 includes an upper connection pipe 11 and a lower connection pipe 12 that are hermetically fixed up and down. The sand control pipe 2 is sleeved outside the upper connection pipe 11, and the support components are formed on the outer wall of the upper connection pipe 11.

[0059] For the convenience of installation and fixation of the sand control pipe 2, as Figure 2 , Figure 7 and Figure 9 shown, the inner wall of the upper end of the lower connecting pipe 12 forms a first stepped hole 121 and a second stepped hole 122 with gradually increasing inner diameters upwards. The lower end of the upper connecting pipe 11 is inserted into the first stepped hole 121 and sealed and fixed. The outer wall of the upper part of the upper connecting pipe 11 forms a first limiting step 112 and a second limiting step 113 with gradually increasing outer diameters upwards. The upper end of the sand control pipe 2 abuts against the second limiting step 113. The lower end of the sand control pipe 2 is inserted into the second stepped hole 122 and abuts against the bottom shoulder of the second stepped hole 122. An annular chamber 3 is formed between the outer wall of the upper connecting pipe 11, the inner wall of the sand control pipe 2, the first limiting step 112 and the bottom shoulder of the second stepped hole 122.

[0060] For the convenience of realizing the sealing and fixation of the upper connecting pipe 11 and the lower connecting pipe 12, as Figure 2 and Figure 7 shown, a first annular groove 114 is formed on the outer wall of the lower end of the upper connecting pipe 11, and a sealing ring 115 is embedded in the first annular groove 114. The outer wall of the lower end of the upper connecting pipe 11 is fixedly connected to the hole wall of the first stepped hole 121 by threads. Generally, in order to prevent rotation between the upper connecting pipe 11 and the lower connecting pipe 12 and ensure the stability of the structure, an anti-rotation screw 116 is inserted between the outer wall of the lower end of the upper connecting pipe 11 and the hole wall of the first stepped hole 121.

[0061] Since a cementing operation needs to be carried out first before the expansion operation, in order to facilitate the smooth passage of the special cementing plug for the expansion pipe, the inner diameter of the upper connecting pipe 11 is the same as the inner diameter of the lower connecting pipe 12 (i.e., the inner diameter of the part of the lower connecting pipe 12 below the first stepped hole 121).

[0062] Furthermore, for the convenience of fixing the sand control cup 4, as Figure 2 , Figure 11 and Figure 12 shown, a cup seat 5 is sleeved and fixed on the outer wall of the lower part of the sand control pipe 2 and below the sand control cup 4. The sand control cup 4 is fixedly connected to the cup seat 5. Generally, a second annular groove 51 is formed on the upper end surface of the cup seat 5. The bottom end of the sand control cup 4 protrudes downwards to form a convex ring 41, and the convex ring 41 is embedded in the second annular groove 51 and vulcanized and fixed to the cup seat 5.

[0063] During actual use, for the convenience of fixing and limiting the cup seat 5, as Figure 2 , Figure 6 , Figure 9 and Figure 10As shown, a third limiting step 23 with an enlarged outer diameter is formed upward on the lower outer wall of the sand control pipe 2, and the upper and lower ends of the cup seat 5 respectively abut against the third limiting step 23 and the upper end face of the lower connecting pipe 12. A plurality of through grooves 123 are circumferentially spaced on the pipe wall of the lower connecting pipe 12 corresponding to the second stepped hole 122, and the through grooves 123 extend upward to the top of the lower connecting pipe 12, and the second circulation holes 22 are communicated with the through grooves 123.

[0064] In this way, the third limiting step 23 and the upper end face of the lower connecting pipe 12 can play an axial limiting role on the cup seat 5, preventing the sand control cup 4 and the cup seat 5 from moving up and down along the axis of the sand control pipe 2. At the same time, the arrangement of the through grooves 123 can ensure that the second circulation holes 22 can be communicated with the inner and outer annuli, ensuring the normal liquid passing of the second circulation holes 22.

[0065] Furthermore, in order to facilitate the connection of both ends of the sand control tool to the corresponding drill pipes 101, an internal thread is formed on the inner wall of the upper end of the upper connecting pipe 11, and an external thread is formed on the outer wall of the lower end of the lower connecting pipe 12.

[0066] The above is only a schematic specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for using a sand control tool for an expandable tubular open hole system, characterized in that, The sand control tool for the expandable tubular open hole system includes a core pipe arranged vertically; A sand control pipe is sleeved on the outer wall of the core pipe at intervals, and an annular chamber with both ends closed is formed by this interval. A sand control cup is sleeved and fixed on the lower outer wall of the sand control pipe, and the opening of the sand control cup faces upward; A plurality of first circulation holes and a plurality of second circulation holes are respectively formed in the pipe wall of the sand control pipe at positions above and below the sand control cup. Both the first circulation holes and the second circulation holes communicate with the annular chamber and the outside of the sand control pipe; The usage method of the sand control tool for the expandable tubular open hole system includes: The sand control tool is used to be installed in the expandable pipe of the outer pipe string and is installed between the drill pipe strings above the expansion cone as a part of the inner pipe string. The inner pipe string includes a connecting sub and a drill pipe arranged from bottom to top. The outer pipe string includes a bottom plug, an expansion cone assembly, and an expandable pipe arranged from bottom to top. When the expansion cone is stuck and unable to move, lower the inner pipe string so that there is a certain gap between the expansion cone and the inclined surface of the inner wall of the expandable pipe. Then start the pump for circulation and pressurize the inner pipe string. The liquid flows downward through the inner pipe string into the pressure chamber at the bottom of the expansion cone. After the high-pressure liquid flows into the bottom of the expansion cone, it flows out through the gap between the expansion cone and the inner wall of the already expanded expandable pipe below and the gap between the expansion cone and the inclined surface of the inner wall of the expandable pipe, then returns upward, and then flows into the annular chamber through the second circulation holes and flows out through the first circulation holes to the inner annular space between the inner pipe string and the outer pipe string to wash the surface of the expansion cone and the space above the expansion cone, thereby discharging the solid object particles entering the expandable pipe from the expandable pipe and resuming the expansion operation.

2. The usage method of the sand control tool for the expandable tubular open hole system according to claim 1, characterized in that On the outer wall of the core pipe and within the annular chamber, multiple groups of support components are formed at intervals along its axial direction. Each group of support components includes a plurality of support blocks arranged at intervals along the circumferential direction of the core pipe, and the outer wall of each support block is an arc surface.

3. The usage method of the sand control tool for the expandable tubular open hole system according to claim 1, characterized in that The multiple first circulation holes and the multiple second circulation holes are respectively arranged on the upper and lower pipe walls of the sand control pipe and are arranged at intervals along the circumferential direction of the sand control pipe.

4. The usage method of the sand control tool for the expandable tubular open hole system according to claim 1, characterized in that The core pipe includes an upper connecting pipe and a lower connecting pipe that are hermetically fixed up and down, and the sand control pipe is sleeved on the outside of the upper connecting pipe.

5. The usage method of the sand control tool for the expandable tubular open hole system according to claim 4, characterized in that The inner wall of the upper end of the lower connecting pipe forms a first stepped hole and a second stepped hole with gradually increasing inner diameters upward. The lower end of the upper connecting pipe is inserted into the first stepped hole and is hermetically fixed; The upper outer wall of the upper connecting pipe forms a first limiting step and a second limiting step with gradually increasing outer diameters upwards. The upper end of the sand control pipe abuts against the second limiting step, and the lower end of the sand control pipe is inserted into the second stepped hole and abuts against the bottom shoulder of the second stepped hole. An annular chamber is formed between the outer wall of the upper connecting pipe, the inner wall of the sand control pipe, the first limiting step and the bottom shoulder of the second stepped hole.

6. The method for using the sand control tool for an expandable pipe open hole system according to claim 5, wherein A first annular groove is formed in the lower outer wall of the upper connecting pipe, and a sealing ring is embedded in the first annular groove. The lower outer wall of the upper connecting pipe is fixedly connected to the hole wall of the first stepped hole by threads.

7. The method for using the sand control tool for an expandable pipe open hole system according to claim 6, wherein An anti-rotation screw is inserted between the lower outer wall of the upper connecting pipe and the hole wall of the first stepped hole.

8. The method for using the sand control tool for an expandable pipe open hole system according to claim 5, wherein The inner diameter of the upper connecting pipe is the same as the inner diameter of the lower connecting pipe.

9. The method for using the sand control tool for an expandable pipe open hole system according to claim 5, wherein A cup seat is sleeved and fixed on the lower outer wall of the sand control pipe and below the sand control cup. The sand control cup is fixedly connected to the cup seat.

10. The method for using the sand control tool for an expandable pipe open hole system according to claim 9, wherein A second annular groove is formed in the upper end face of the cup seat. The bottom end of the sand control cup protrudes downward to form a convex ring, and the convex ring is embedded in the second annular groove and vulcanized and fixed to the cup seat.

11. The method for using the sand control tool for an expandable pipe open hole system according to claim 9, wherein A third limiting step with an enlarged outer diameter is formed upwards on the lower outer wall of the sand control pipe. The upper end and the lower end of the cup seat respectively abut against the third limiting step and the upper end face of the lower connecting pipe. A plurality of through grooves are formed at intervals along the circumferential direction of the pipe wall of the lower connecting pipe corresponding to the second stepped hole, and the through grooves extend upwards to the top of the lower connecting pipe. The second circulation hole is communicated with the through grooves.

12. The method for using the sand control tool for an expandable pipe open hole system according to claim 4, wherein Internal threads are formed on the inner wall of the upper end of the upper connecting pipe, and external threads are formed on the outer wall of the lower end of the lower connecting pipe.

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