Inflatable screen pipe hanger

Abstract

The present application belongs to the technical field of petroleum engineering, and discloses an expansion type screen pipe hanger, wherein a center pipe string is arranged in an outer pipe string. The outer pipe string comprises an expansion pipe and an extension pipe connected with each other, and the inner side of the extension pipe is provided with a locking part. A hydraulic expansion cone is arranged between the outer pipe string and the center pipe string. A first stopper, an elastic locking part and a second stopper are all located between the center pipe string and the outer pipe string. The first stopper is connected with the hydraulic expansion cone, is fixedly connected with the center pipe string and can be disconnected with the center pipe string. The second stopper is fixed in the axial direction relative to the center pipe string. When the first stopper is fixedly connected with the center pipe string, the first stopper and the second stopper jointly stop the elastic locking part to keep the elastic locking part locked with the locking part. When the first stopper is disconnected with the center pipe string, the first stopper is driven by the hydraulic expansion cone to move to release the stop of the elastic locking part, so that the elastic locking part is separated from the locking part.

Description

Technical Field

[0001] This invention relates to the field of petroleum engineering technology, and in particular to an expandable screen pipe hanger. Background Technology

[0002] Screen completion has advantages such as simple construction procedures, low operating costs, and high success rates, making it the main completion method for horizontal wells. A screen hanger is an important completion tool that sends the completion screen to a predetermined position within the well and suspends it on the inner wall of the upper casing using hydraulic or mechanical action, thus completing the sand control construction of the oil well.

[0003] The expandable screen hanger is an advanced screen hanger that, through a rubber structure on the expansion tube, can permanently seal the top of the screen while suspending the screen string, preventing sand from the formation from flowing out from the top of the screen. During on-site construction with the expandable screen hanger, it is crucial to first determine if the screen has been successfully released. If a mechanical release method is used, the screen needs to be brought to the bottom of the well for inverted release, which may prevent the screen from being suspended at any predetermined position and could lead to complex accidents such as stuck drill bits. Furthermore, since mechanical release relies on changes in suspended weight to determine whether release has been completed, it is very difficult to determine the success of release when suspending short screens, such as 20 to 30 meters long, as their weight is very small and not easily observed from the ground. Summary of the Invention

[0004] The purpose of this invention is to provide an expandable screen tube hanger that allows for easy release at any position, with simple and accurate release judgment and simple and accurate suspension operation judgment.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An expandable screen tube hanger includes:

[0007] An outer tube string, the outer tube string including a connected expansion tube and an extension tube, the inner side of the extension tube being provided with a locking part;

[0008] A central tube string, which is inserted inside the outer tube string;

[0009] A hydraulic expansion cone, wherein the hydraulic expansion cone is sleeved between the outer tube string and the central tube string;

[0010] A first stop, an elastic locking member, and a second stop are located between the central tube string and the outer tube string. The first stop is connected to the hydraulic expansion cone and is fixedly connected to the central tube string, but can be disconnected from the central tube string. The second stop is axially fixed relative to the central tube string. When the first stop is fixedly connected to the central tube string, the first stop and the second stop together stop the elastic locking member to keep the elastic locking member locked with the locking part. When the first stop is disconnected from the central tube string, the first stop moves under the action of the hydraulic expansion cone to release the stop on the elastic locking member, allowing the elastic locking member to separate from the locking part under its own elastic force.

[0011] Optionally, the first stop member is provided with a circumferential stop portion and an axial stop portion. When the first stop member is fixedly connected to the central tube string, the axial stop portion stops on one side of the axial direction of the elastic locking member, the second stop member stops on the other side of the axial direction of the elastic locking member, and the circumferential stop portion stops on the inner circumferential side of the elastic locking member, so that the elastic locking member and the locking portion remain locked. When the first stop member is disconnected from the central tube string, under the action of the hydraulic expansion cone, both the axial stop portion and the circumferential stop portion move away from the second stop member to release the stop on the elastic locking member. The elastic locking member contracts its outer diameter under its own elastic force to separate from the locking portion.

[0012] Optionally, the second stop member is provided with a guide surface, which forms a receiving groove with the central tube string. When the hydraulic expansion cone is fixedly connected to the central tube string, the guide surface stops the elastic locking member. When the hydraulic expansion cone is disconnected from the central tube string, the elastic locking member can enter the receiving groove along the guide surface.

[0013] Optionally, the extension tube includes a first tube and a second tube, the second tube being detachably connected to the expansion tube, the first stop extending from the hydraulic expansion cone from inside the expansion tube to inside the second tube, the first tube being detachably connected to the second tube, one of the first tube and the second tube having a locking step, and the other forming a recessed locking portion with the locking step.

[0014] Optionally, one end of the second tube is fitted over the first tube, and one end of the expansion tube is fitted over the second tube.

[0015] Optionally, the system also includes a retrieval rod and a bottom plug. The first end of the retrieval rod passes through the central tube string, and the second end extends out of the central tube string and enters the extension tube. The bottom plug is located at the second end of the retrieval rod and seals the extension tube. The central tube string has a first stop portion, and the retrieval rod has a second stop portion. The central tube string moves relative to the retrieval rod along a first direction, enabling the first stop portion and the second stop portion to stop each other. The stroke of the hydraulic expansion cone moving out of the expansion tube along the first direction is less than the distance between the first stop portion and the second stop portion. The first direction is the direction from the extension tube to the expansion tube.

[0016] Optionally, the extension tube includes a first inner diameter section and a second inner diameter section connected together. The first inner diameter section is connected to the expansion tube, and the inner diameter of the second inner diameter section is smaller than that of the first inner diameter section to form a limiting step at the connection between the two. The bottom plug includes a first plug and a second plug connected together. The first plug is sealed in the first inner diameter section and abuts against the limiting step, and the second plug is sealed in the second inner diameter section.

[0017] Optionally, the first stop portion includes a first stop step protruding from the inner peripheral wall of the central tube string, and the second stop portion includes a second stop step protruding from the outer peripheral wall of the retrieval rod.

[0018] Optionally, the expandable screen tube hanger also includes a sand shield at the end of the expandable tube away from the extension tube, which seals the gap between the central tube string and the expandable tube.

[0019] Optionally, the first stop is fixedly connected to the central tube string by a shearable cutting element.

[0020] The beneficial effects of this invention are:

[0021] The expandable screen pipe hanger provided by this invention uses a pump to drive a hydraulic expansion cone through hydraulic pressure. When the hydraulic pressure acting on the expansion cone meets the release pressure, the expansion cone causes the first stop to disconnect from the central pipe string. The movement of the first stop releases the stop on the elastic locking member, which then separates from the locking part under its own elastic force. At this point, the central pipe string and the outer pipe string are no longer relatively fixed, achieving the release effect. Since the release of the outer pipe string from the central pipe string is achieved through hydraulic pressure, the pump pressure will drop significantly and suddenly when the first stop disconnects from the central pipe string, thus providing an accurate basis for judging the release during on-site construction. The release operation can be carried out at any position in the well via pump pressure, without having to go down to the bottom of the well. After successful release, the expandable screen pipe hanger is suspended. Under the action of hydraulic pressure, the hydraulic expansion cone moves upward, thereby expanding the expansion pipe and pressing it tightly against the well, achieving suspension and sealing. When the hydraulic expansion cone moves upward out of the expansion pipe, the pump pressure will drop suddenly and sharply, indicating that the suspension operation is over, achieving accurate judgment of the suspension operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the expandable screen tube hanger provided in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Schematic diagram of the structure at point A;

[0024] Figure 3 yes Figure 2 Schematic diagram of the structure at point D;

[0025] Figure 4 yes Figure 2 Schematic diagram of the structure at point E;

[0026] Figure 5 yes Figure 1 Schematic diagram of the structure at point B;

[0027] Figure 6 yes Figure 1 A schematic diagram of the structure at point C.

[0028] In the picture:

[0029] 100. Outer tube string; 110. Expansion tube; 121. First tube; 122. Second tube; 123. Locking step; 124. First inner diameter section; 125. Second inner diameter section; 126. Limiting step; 130. Locking part;

[0030] 200. Central tube string; 201. First stop step; 202. Upper central tube; 203. Lower central tube; 204. Central tube connector;

[0031] 300. Hydraulic expansion cone;

[0032] 410. First stop; 411. Circumferential stop; 412. Axial stop; 420. Elastic locking element; 430. Second stop; 431. Guide surface; 440. Receiving groove;

[0033] 500. Salvage rod; 501. Second stop step;

[0034] 600, bottom plug; 601, first blockage; 602, second blockage;

[0035] 700, sand shield;

[0036] 800, sealing sleeve;

[0037] 900. Cutting component. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0042] like Figure 1 As shown, this embodiment provides an expandable screen tube hanger, which includes an outer tube string 100, a central tube string 200, a hydraulic expansion cone 300, a first stop 410, an elastic locking member 420, and a second stop 430.

[0043] See also Figure 1 As shown, the central tube string 200 passes through the outer tube string 100. The outer tube string 100 includes a connected expansion tube 110 and an extension tube, with a locking part 130 on the inner side of the extension tube. A hydraulic expansion cone 300 is sleeved between the outer tube string 100 and the central tube string 200. The hydraulic expansion cone 300 refers to an expansion cone that is hydraulically driven and can move upward along the axial direction of the expansion screen tube hanger; its specific structure will not be described in detail here.

[0044] In this embodiment, as Figure 1 As shown, the central tube string 200 includes an upper central tube 202, a lower central tube 203, and a central tube connector 204. The upper end of the upper central tube 202 is located above the expansion tube 110, and the lower end extends into the expansion tube 110. The lower central tube 203 is located inside the outer tube string 100, and the upper central tube 202 is connected to the lower central tube 203 through the central tube connector 204.

[0045] like Figure 2 and Figure 3 As shown, the first stop 410, the elastic locking member 420, and the second stop 430 are all located between the central tube string 200 and the outer tube string 100. The first stop 410 is connected to the hydraulic expansion cone 300 and is fixedly connected to the central tube string 200, but can also be disconnected from the central tube string 200. The second stop 430 is fixed axially relative to the central tube string 200. When the first stop 410 is fixedly connected to the central tube string 200, the first stop 410 and the second stop 430 together stop the elastic locking member 420 to keep the elastic locking member 420 locked with the locking part 130. When the first stop 410 is disconnected from the central tube string 200, the first stop 410 moves under the action of the hydraulic expansion cone 300 to release the stop on the elastic locking member 420, so that the elastic locking member 420 separates from the locking part 130 under its own elastic force.

[0046] In this embodiment, a sealing sleeve 800 is provided outside the expansion tube 110. The sealing sleeve 800 expands as the expansion tube 110 expands, thus achieving a sealed fit inside the well. Specifically, the sealing sleeve 800 is a rubber sleeve.

[0047] The first stop 410 and the second stop 430 lock the elastic locking member 420 with the locking part 130. The first stop 410 is fixedly connected to the central tube string 200, and the second stop 430 is relatively fixed with the central tube string 200. Therefore, the elastic locking member 420 is relatively fixed with the central tube string 200, and the elastic locking member 420 is locked with the locking part 130. The locking part 130 is provided on the extension tube. Therefore, the central tube string 200 and the outer tube string 100 can remain relatively fixed during the process of being lowered into the well.

[0048] The pump is started, and the hydraulic expansion cone 300 is driven by hydraulic pressure. When the hydraulic pressure acting on the expansion cone 300 meets the release pressure, the expansion cone 300 causes the first stop 410 to disconnect from the central tube string 200. The movement of the first stop 410 releases the stop on the elastic locking member 420, and the elastic locking member 420 separates from the locking part 130 under its own elastic force. At this time, the central tube string 200 and the outer tube string 100 are no longer relatively fixed, achieving the release effect. Since the release of the outer tube string 100 from the central tube string 200 is achieved by hydraulic pressure, the pump pressure will drop significantly and suddenly when the first stop 410 disconnects from the central tube string 200, thus providing an accurate basis for judging the release during on-site construction.

[0049] After successful release, the expansion screen pipe hanger is suspended. Under hydraulic pressure, the hydraulic expansion cone 300 moves upward, thereby expanding the expansion pipe 110 and pressing it tightly against the well, achieving suspension and sealing. When the hydraulic expansion cone 300 moves upward out of the expansion pipe 110, the pump pressure will suddenly drop sharply, indicating that the suspension operation is complete.

[0050] like Figure 2 As shown, optionally, the first stop 410 is fixedly connected to the central tube string 200 by a shearable shearing member 900. Specifically, the shearing member 900 is a shearing pin, which is arranged perpendicular to the axis of the expansion screen tube hanger, with one end connected to the first stop 410 and the other end connected to the central tube string 200.

[0051] like Figure 3As shown, optionally, the first stop 410 is provided with a circumferential stop 411 and an axial stop 412. When the first stop 410 is fixedly connected to the central tube string 200, the axial stop 412 stops on one side of the axial direction of the elastic locking member 420, the second stop 430 stops on the other side of the axial direction of the elastic locking member 420, and the circumferential stop 411 stops on the inner circumferential side of the elastic locking member 420, so that the elastic locking member 420 and the locking part 130 remain locked. When the first stop 410 is disconnected from the central tube string 200, under the action of the hydraulic expansion cone 300, the axial stop 412 and the circumferential stop 411 move away from the second stop 430 to release the stop on the elastic locking member 420. The elastic locking member 420 shrinks its outer diameter under its own elastic force to separate from the locking part 130. With the above settings, the elastic locking member 420 is stable and highly reliable when locked, and its movement trajectory is stable and highly reliable when switching from locked to unlocked. Specifically, both the first stop 410 and the second stop 430 are sleeve-shaped, the axial stop 412 and the circumferential stop 411 are integrally formed as a stepped structure at the end of the first stop 410, and the elastic locking member 420 is a resilient snap ring with a C-shaped structure.

[0052] In this embodiment, the expansion cone is threadedly connected to the first stop 410. The second stop 430 is fitted over the central tube string 200 and fixed to the central tube string 200 by a step.

[0053] like Figure 3 As shown, optionally, the second stop 430 is provided with a guide surface 431, which, together with the central tube string 200, forms a receiving groove 440. When the hydraulic expansion cone 300 is fixedly connected to the central tube string 200, the guide surface 431 stops against the elastic locking member 420. When the hydraulic expansion cone 300 is disconnected from the central tube string 200, the elastic locking member 420 can enter the receiving groove 440 along the guide surface 431. The receiving groove 440 is used to receive the elastic locking member 420 whose outer diameter has contracted, preventing the unlocked elastic locking member 420 from affecting the relative movement between the central tube string 200 and the outer tube string 100. In this embodiment, the receiving groove 440 is an annular groove, and the guide surface 431 is inclined to the axis of the central tube string 200 and extends to the bottom of the receiving groove 440.

[0054] like Figure 3As shown, optionally, the extension tube includes a first tube 121 and a second tube 122. The second tube 122 is detachably connected to the expansion tube 110. A first stop 410 extends from the hydraulic expansion cone 300 from inside the expansion tube 110 to inside the second tube 122. The first tube 121 is detachably connected to the second tube 122. One of the first tube 121 and the second tube 122 is provided with a locking step 123, and the other tube and the locking step 123 form a recessed locking portion 130. During installation, the first stop 410, the elastic locking member 420, and the second stop 430 are first installed outside the central tube string 200. Then, the first tube 121 and the second tube 122 are installed from opposite directions in the axial direction, so that the locking step 123 cooperates with the other to form a recessed locking portion 130, and the locking portion 130 is precisely locked and covers the elastic locking member 420, that is, the elastic locking member 420 is inserted into the locking portion 130. The first tube 121 and the second tube 122 are detachably connected, and the second tube 122 is detachably connected to the expansion tube 110, thereby enabling the above-described installation process and achieving the manufacturability of the expansion-type screen tube hanger. In this embodiment, the locking step 123 is provided on the inner circumferential side of the second tube 122. In this embodiment, the second tube 122 is threadedly connected to the first tube 121, and the second tube 122 is threadedly connected to the expansion tube 110.

[0055] To further improve the manufacturability of the expandable screen tube hanger, one end of the second tube 122 is fitted over the first tube 121, and one end of the expansion tube 110 is fitted over the second tube 122. During installation, firstly, the first tube 121 is fitted over the central tube string 200, then the second tube 122 is fitted over the central tube string 200 and connected to the first tube 121, and finally, the expansion tube 110 is fitted over and installed on the second tube 122.

[0056] After the expandable screen pipe hanger is expanded and suspended, a pressure test is required to verify its sealing performance. During this test, the bottom plug 600 needs to remain at the bottom of the well to provide a sealed space for the pressure test. Currently, after the pressure test is completed and the center pipe string 200 is pulled out of the well, the bottom plug 600 is often handled by either lowering a fishing tool for retrieval or milling with a milling tool. This reduces construction efficiency and increases well completion costs.

[0057] like Figure 1As shown, to solve the above problems, the expandable screen tube hanger also includes a retrieval rod 500 and a bottom plug 600. The first end of the retrieval rod 500 passes through the central tube string 200, and the second end extends out of the central tube string 200 and enters the extension tube. The bottom plug 600 is located at the second end of the retrieval rod 500 and seals the extension tube. The central tube string 200 has a first stop, and the retrieval rod 500 has a second stop. The central tube string 200 moves relative to the retrieval rod 500 along a first direction, allowing the first and second stops to stop each other. The stroke of the hydraulic expansion cone 300 moving out of the expansion tube 110 along the first direction is less than the distance between the first and second stops. The first direction is from the extension tube to the expansion tube 110. In this embodiment, the first direction is from bottom to top. The stroke of the hydraulic expansion cone 300 moving out of the expansion tube 110 along the first direction is less than the distance between the first and second stops, thereby preventing the bottom plug 600 from moving during suspension operations.

[0058] After the suspension operation is completed, the rubber sleeve outside the expansion tube 110 seals the annular space around the expansion tube 110, while the bottom plug 600 inside the expansion tube 110 seals the internal space. Together, they form a closed space downhole. At this point, closing the blowout preventer at the wellhead allows for a pressure test of this closed space to verify its sealing performance. If the pressure remains stable after reaching the predetermined pressure on the surface, it indicates that the seal of this closed space is reliable, demonstrating that the rubber sleeve outside the expansion tube 110 effectively seals the annular space around the expansion tube 110, thus verifying the sealing performance of the expandable screen pipe hanger.

[0059] After the pressure test, the blowout preventer at the wellhead was opened, and the center pipe string 200 was continued to be raised. The center pipe string 200 and the fishing rod 500 form a double-layer structure. When the center pipe string 200 rises a certain distance relative to the fishing rod 500, the first and second stops stop each other, and the center pipe string 200 drives the fishing rod 500 upward together, thereby lifting the bottom plug 600 away from the bottom of the well. After the bottom plug 600, fishing rod 500, expansion cone, etc., are lifted to the surface along with the entire center pipe string 200, the expandable screen pipe hanger left at the bottom of the well is a bare pipe structure, achieving self-draining. Its diameter can meet the needs of subsequent operations, thus avoiding the need to separately retrieve or mill the bottom plug 600, saving operation time and reducing operation costs.

[0060] like Figure 4 and Figure 5 As shown, specifically, the first stop portion includes a first stop step 201 protruding from the inner peripheral wall of the central tube string 200, and the second stop portion includes a second stop step 501 protruding from the outer peripheral wall of the retrieval rod 500.

[0061] like Figure 6As shown, in order to achieve the positioning and sealing of the bottom plug 600 within the outer pipe string 100, and to ensure that the bottom plug 600 can also be lifted relative to the outer pipe string 100, optionally, the extension pipe includes a first inner diameter section 124 and a second inner diameter section 125 connected together. The first inner diameter section 124 is connected to the expansion pipe 110, and the inner diameter of the second inner diameter section 125 is smaller than that of the first inner diameter section 124, so as to form a limiting step 126 at the connection between the two. The bottom plug 600 includes a first plug 601 and a second plug 602 connected together. The first plug 601 is sealed within the first inner diameter section 124 and abuts against the limiting step 126, and the second plug 602 is sealed within the second inner diameter section 125.

[0062] like Figure 1 As shown, optionally, the expandable screen tube hanger also includes a sand shield 700, which is located at the end of the expansion tube 110 away from the extension tube and seals the gap between the central tube string 200 and the expansion tube 110. This prevents debris from entering the outer tube string 100 and the central tube string 200.

[0063] The expandable screen pipe hanger provided in this embodiment can be released at any location according to site requirements and can accurately determine whether the release operation is successful, providing a basis for subsequent construction. After the expansion pipe 110 has completed expansion, it can be directly pressure tested, and after the pressure test is completed, the bottom plug 600 can be pulled out of the well along with the central pipe string 200. Thus, the processes of lowering, releasing, suspension, pressure testing, and retrieving the bottom plug 600 are completed in one trip, realizing the self-diametering of the expandable screen pipe hanger.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An expandable screen tube hanger, characterized in that, include: The outer tube string (100) includes an expansion tube (110) and an extension tube connected together, and the inner side of the extension tube is provided with a locking part (130). A central tube string (200) is inserted inside the outer tube string (100); A hydraulic expansion cone (300) is sleeved between the outer tube string (100) and the central tube string (200); A first stop (410), an elastic locking member (420), and a second stop (430) are located between the central tube string (200) and the outer tube string (100). The first stop (410) is connected to the hydraulic expansion cone (300) and is fixedly connected to the central tube string (200), but can be disconnected from the central tube string (200). The second stop (430) remains fixed axially relative to the central tube string (200). When the first stop (410) is fixedly connected to the central tube string... When (200), the first stop (410) and the second stop (430) jointly stop the elastic locking member (420) to keep the elastic locking member (420) locked with the locking part (130). When the first stop (410) is disconnected from the central tube string (200), the first stop (410) moves under the drive of the hydraulic expansion cone (300) to release the stop on the elastic locking member (420) and make the elastic locking member (420) separate from the locking part (130) under its own elastic force.

2. The expandable screen tube hanger according to claim 1, characterized in that, The first stop (410) is provided with a circumferential stop (411) and an axial stop (412). When the first stop (410) is fixedly connected to the central tube string (200), the axial stop (412) stops on one side of the axial direction of the elastic locking member (420), the second stop (430) stops on the other side of the axial direction of the elastic locking member (420), and the circumferential stop (411) stops on the inner circumferential side of the elastic locking member (420), so that the elastic locking member (420) is in a more stable position. The stop (420) remains locked to the locking part (130). When the first stop (410) is disconnected from the central tube string (200), under the drive of the hydraulic expansion cone (300), the axial stop (412) and the circumferential stop (411) move away from the second stop (430) to release the stop on the elastic locking part (420). The elastic locking part (420) shrinks its outer diameter under its own elastic force to separate from the locking part (130).

3. The expandable screen tube hanger according to claim 2, characterized in that, The second stop (430) is provided with a guide surface (431), which together with the central tube string (200) forms a receiving groove (440). When the hydraulic expansion cone (300) is fixedly connected to the central tube string (200), the guide surface (431) stops against the elastic locking member (420). When the hydraulic expansion cone (300) is disconnected from the central tube string (200), the elastic locking member (420) can enter the receiving groove (440) along the guide surface (431).

4. The expandable screen tube hanger according to claim 2, characterized in that, The extension tube includes a first tube (121) and a second tube (122). The second tube (122) is detachably connected to the expansion tube (110). The first stop (410) extends from the hydraulic expansion cone (300) from inside the expansion tube (110) to inside the second tube (122). The first tube (121) is detachably connected to the second tube (122). One of the first tube (121) and the second tube (122) is provided with a locking step (123), and the other tube and the locking step (123) form a recessed locking portion (130).

5. The expandable screen tube hanger according to claim 4, characterized in that, One end of the second tube (122) is fitted over the first tube (121), and one end of the expansion tube (110) is fitted over the second tube (122).

6. The expandable screen tube hanger according to claim 1, characterized in that, It also includes a retrieval rod (500) and a bottom plug (600). The first end of the retrieval rod (500) passes through the central tube string (200), and the second end extends out of the central tube string (200) and enters the extension tube. The bottom plug (600) is located at the second end of the retrieval rod (500) and blocks the extension tube. The central tube string (200) is provided with a first stop and the retrieval rod (500) is provided with a second stop. The central tube string (200) moves relative to the retrieval rod (500) in a first direction, so that the first stop and the second stop can stop each other. The stroke of the hydraulic expansion cone (300) moving out of the expansion tube (110) in the first direction is less than the distance between the first stop and the second stop. The first direction is the direction from the extension tube to the expansion tube (110).

7. The expandable screen tube hanger according to claim 6, characterized in that, The extension tube includes a first inner diameter section (124) and a second inner diameter section (125) connected together. The first inner diameter section (124) is connected to the expansion tube (110). The inner diameter of the second inner diameter section (125) is smaller than that of the first inner diameter section (124) to form a limiting step (126) at the connection between the two. The bottom plug (600) includes a first plug (601) and a second plug (602) connected together. The first plug (601) is sealed in the first inner diameter section (124) and abuts against the limiting step (126). The second plug (602) is sealed in the second inner diameter section (125).

8. The expandable screen tube hanger according to claim 6, characterized in that, The first stop portion includes a first stop step (201) protruding from the inner peripheral wall of the central tube string (200), and the second stop portion includes a second stop step (501) protruding from the outer peripheral wall of the retrieval rod (500).

9. The expandable screen tube hanger according to any one of claims 1-8, characterized in that, It also includes a sand shield (700) at the end of the expansion tube (110) away from the extension tube, and seals the gap between the central tube string (200) and the expansion tube (110).

10. The expandable screen tube hanger according to any one of claims 1-8, characterized in that, The first stop (410) is fixedly connected to the central tube string (200) by a shearable cutting element (900).

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