Aluminum alloy corrosion-resistant part and suspension packer

Abstract

The invention belongs to the technical field of petroleum engineering well completion, and particularly relates to an aluminum alloy corrosion-resistant part and a suspension packer. The aluminum alloy material is prepared from the following components in percentage by mass: 4.62 to 5.71 percent of Cu, 0.49 to 0.67 percent of Mg, 0.5 to 0.75 percent of Ag, 0.24 to 0.32 percent of Mn, 0.13 to 0.14 percent of Zr and the balance of Al. According to the aluminum alloy material, the component mass ratio is improved on the basis of an existing aluminum alloy, the yield strength of the aluminum alloy material optimized at the high temperature of 200 DEG C is 400 MPa or above, the tensile strength is 452 MPa or above, and the strength of the aluminum alloy material is equivalent to that of Q345 carbon steel.

Description

Technical Field

[0001] This invention belongs to the field of well completion technology in petroleum engineering, specifically relating to an aluminum alloy material, corrosion-resistant component, and suspension packer. Background Technology

[0002] Open-hole fracturing technology for horizontal wells is a rapidly developing new well completion technology in the field of oil and gas well engineering in recent years. The completion string consists of a back-insertion string, a suspended packer, a horizontal section fracturing string, an open-hole packer, and a ball-dropped sliding sleeve. This technology is applied to the fracturing and production enhancement of horizontal wells in unconventional oil and gas resource development. Based on the formation geological conditions and reservoir development needs, the horizontal well can be divided into several sections using open-hole packers to achieve layered operations and segmented production. Targeted segmented fracturing of the producing formation expands the drainage area of ​​the oil and gas producing formation, improves oil and gas recovery, and has significant technical advantages.

[0003] In multi-stage open-hole fracturing operations in horizontal wells, fracturing suspension packers are mainly used for well completion fracturing string deployment, bidirectional anchoring, and high-pressure sealing of the annulus. As one of the core tools in fracturing, the quality of the fracturing suspension packer directly affects the smooth progress of fracturing and well completion operations. Suspension packers mainly include two types: permanent and removable. Permanent packers, such as Halliburton's HPHT high-temperature and high-pressure bidirectional anchoring packer and Baker Hughes' S3-HR bidirectional anchoring packer, are made of steel and cannot be unsealed or drilled out. Removable fracturing anchoring packer suspensions, such as Baker Hughes' SC-2PAH packer, Weatherford's Blackcat H packer, and Halliburton's Retrevable Placker packer, are also made of steel. However, during long-term production, they also present problems such as difficulty in unsealing, affecting subsequent sidetracking and workover operations.

[0004] For ultra-deep fractured-vuggy carbonate reservoirs, sidetracking operations are required later, necessitating the removal of in-well tools. However, in deep and ultra-deep wells, due to reasons such as completion fluid sedimentation and insufficient tubing load, removable suspended packers often face difficulties in unsealing, affecting subsequent sidetracking operations.

[0005] Therefore, there is an urgent need to improve the current suspension packers. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems in the prior art, the present invention provides an aluminum alloy material, corrosion-resistant parts, and a suspended packer. The suspended packer realizes acid pressing, top suspension during production, sealing, and meets the side drilling requirements in the later stage of production.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] An aluminum alloy material comprising the following components in the following mass ratio:

[0009] Cu: 4.62-5.71%, Mg: 0.49-0.67%, Ag: 0.5-0.75%, Mn: 0.24-0.32%, Zr: 0.13-0.14%, balance Al.

[0010] Furthermore, the mass ratio of each component is as follows:

[0011] Cu: 4.62-5.68%, Mg: 0.49-0.63%, Ag: 0.5-0.56%, Mn: 0.32%, Zr: 0.14%, balance Al.

[0012] Furthermore, the mass ratio of each component is as follows:

[0013] Cu: 4.62%, Mg: 0.49%, Ag: 0.56%, Mn: 0.32%, Zr: 0.14%, balance Al.

[0014] The present invention also provides a corrosion-resistant component, comprising a substrate and a coating on the surface of the substrate, wherein the substrate is made of the aforementioned aluminum alloy material.

[0015] Furthermore, the coating includes a first coating and a second coating, wherein the first coating is disposed between the substrate and the second coating, the first coating is a nickel coating, and the second coating is a copper coating.

[0016] Furthermore, the thickness of the first coating is 9-11 μm, and the thickness of the second coating is 88-104 μm.

[0017] Furthermore, the thickness of the first coating is 10 μm, and the thickness of the second coating is 100 μm.

[0018] The present invention also provides a suspended packer, including the corrosion-resistant component described above.

[0019] Furthermore, the suspension packer also includes a rubber sleeve, and the corrosion-resistant component includes a central tube, a rigid anti-protrusion ring, a fixed pressure application component, a sliding pressure application component, and a hydraulic cylinder assembly. The rubber sleeve, rigid anti-protrusion ring, fixed pressure application component, sliding pressure application component, and hydraulic cylinder assembly are all sleeved on the central tube. The rubber sleeve can slide on the central tube. Two rigid anti-protrusion rings are fixed on both sides of the rubber sleeve. The fixed pressure application component and the sliding pressure application component are located on opposite sides of the two rigid anti-protrusion rings. The fixed pressure application component is fixed in position on the axis of the central tube. The hydraulic cylinder assembly is used to push the sliding pressure application component toward the fixed pressure application component.

[0020] Furthermore, the inner and outer surfaces of the rubber tube are both cylindrical surfaces collinear with the axis of the central tube, and the two end faces of the rubber tube are symmetrically arranged conical surfaces, with the side of the two conical surfaces away from the central tube inclined toward each other; each rigid anti-protrusion ring is attached to the end of its corresponding outer surface of the rubber tube and the conical surface of the rubber tube; the two sides of the two rigid anti-protrusion rings that are away from each other are symmetrical conical surfaces, with the side of the two conical surfaces away from the central tube inclined toward each other; the two end faces of the fixed pressure application component and the sliding pressure application component that are close to each other are both perpendicular to the axis of the central tube.

[0021] Furthermore, the corrosion-resistant component also includes a backstop assembly, which includes a backstop element and a backstop seat. The backstop element is connected to the output end of the hydraulic cylinder assembly, and the backstop seat is fixed on the outside of the central tube. The backstop element and the backstop seat cooperate with each other, and the backstop element can only move towards the fixed pressure assembly on the backstop seat.

[0022] Furthermore, the anti-reverse seat is a spring-loaded anti-reverse seat, which fits tightly with the anti-reverse component.

[0023] Furthermore, the rubber tube is composed of a first cylinder and two second cylinders. The first cylinder is located between the two second cylinders and is tightly fitted to the two second cylinders. The two conical surfaces of the rubber tube are the two opposite ends of the two second cylinders.

[0024] Furthermore, the two ends of the first cylinder are symmetrically arranged conical surfaces, with the side of the two conical surfaces away from the central tube inclined toward each other.

[0025] Furthermore, the angle between the conical surface of the rigid anti-surge ring away from the rubber sleeve and the axis of the central tube is greater than the angle between the conical surface of the rubber sleeve and the axis of the central tube.

[0026] Furthermore, the sliding pressure assembly includes a first conical ring, a first slip, a support ring, and a protective sleeve; the support ring is sleeved on the central tube and can slide linearly on the central tube, and the first slip is sleeved and fixed on the support ring; the first conical ring is located between the rubber sleeve and the support ring, and the end of the first conical ring away from the rubber sleeve is a conical surface, which contracts inward at the end away from the rubber sleeve; the protective sleeve is located between the central tube and the first slip, and between the first conical ring and the support ring; after the rubber sleeve is set, the protective sleeve deforms or cracks, and then the first conical ring wedges into the first slip.

[0027] Furthermore, the fixed pressure assembly includes a second conical ring and a second slip; the second slip is sleeved on the central tube and its position on the axis of the central tube is fixed; the second conical ring is located between the second slip and the rubber sleeve, and the end of the second conical ring away from the rubber sleeve is a conical surface, which tapers inward at the end away from the rubber sleeve; the second conical ring is used to wed in the second slip.

[0028] Furthermore, both the first and second slips are inlaid with tooth blocks, which are tungsten carbide particles with a diameter of 9-10 mm.

[0029] Furthermore, both the first and second slips have gaps on their surfaces, with the length of the gaps aligned with the axis of the first or second slip, and the gaps are 2mm wide and 8mm deep.

[0030] Furthermore, the suspension packer also includes a first protective pin, which passes through the first conical ring and inserts into the central tube wall. The shearing fracture of the first protective pin occurs before the protective sleeve deforms or cracks.

[0031] Furthermore, the suspension packer also includes a second protective pin and a first protective pin. The second protective pin passes through the second conical ring and inserts into the central tube wall, while the first protective pin passes through the first conical ring and inserts into the central tube wall. The shear fracture of the first protective pin occurs before the shear fracture of the second protective pin, and the shear fracture of the second protective pin occurs before the protective sleeve deforms or cracks.

[0032] Furthermore, the second valve is fixed relative to the central tube.

[0033] Furthermore, the hydraulic cylinder assembly includes a lower connector, an isolation sleeve, and a first cylinder body. The lower connector is sleeved and fixed on the central tube, and the isolation sleeve is sleeved and slidably sealed on the lower connector. The first cylinder body is sleeved on the central tube and slides linearly on the central tube, with its end away from the sliding pressure application assembly located between the isolation sleeve and the central tube. The lower connector, isolation sleeve, first cylinder body, and central tube form a first hydraulic chamber, and the central tube has a first injection hole communicating with the first hydraulic chamber. The end of the first cylinder body near the sliding pressure application assembly is used to push the sliding pressure application assembly toward the fixed pressure application assembly.

[0034] Furthermore, the hydraulic cylinder assembly also includes a starting pin, which passes through the isolation sleeve and connects to the lower connector. After the pressure in the first hydraulic chamber meets the shearing requirement of the starting pin, the isolation sleeve slides.

[0035] Furthermore, the hydraulic cylinder assembly also includes a fixed sleeve and a second cylinder body. The fixed sleeve is fitted and fixed on the central tube, located inside the first cylinder body, and slidably sealed with the first cylinder body. The second cylinder body is fitted on the central tube, with one end near the fixed sleeve between the first cylinder body and the central tube. The fixed sleeve, the first cylinder body, the second cylinder body, and the central tube form a second hydraulic chamber. The central tube has a second injection hole communicating with the second hydraulic chamber. The end of the second cylinder body near the sliding pressure component is used to push the sliding pressure component toward the fixed pressure component.

[0036] Furthermore, the hydraulic cylinder assembly also includes a protective ring, which is sleeved and fixed on the lower connector, and the protective ring is located on the side of the isolation sleeve away from the rubber tube.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The aluminum alloy material provided by this invention improves the component mass ratio based on the existing aluminum alloy. The optimized aluminum alloy material has a yield strength of over 400MPa and a tensile strength of over 452MPa at a high temperature of 200℃, which is comparable to the strength of Q345 carbon steel.

[0039] The corrosion-resistant parts made of aluminum alloy provided by this invention have nickel and copper plating on their surfaces. Experiments have verified that the corrosion-resistant parts can meet the acid resistance requirements for more than 9 hours in an environment of 180°C and 20% hydrochloric acid.

[0040] The suspended packer provided by this invention replaces the steel material in the prior art with the corrosion-resistant material provided by this invention. The corrosion-resistant material is made of aluminum alloy, which not only has high yield strength, tensile strength, and long-term corrosion resistance, but is also easy to drill out, meeting the requirements of subsequent side-drilling. Furthermore, the slips in the suspended packer are inlaid with tooth blocks made of tungsten carbide, improving the slips' anchoring capacity, with an ultimate load capacity of 75.6t, thus increasing the service life and fracturing performance of the suspended packer. Attached Figure Description

[0041] Figure 1 The tensile strength curves of the aluminum alloy materials provided in Examples 1 to 3 of the present invention are shown; wherein, alloy 1 is the aluminum alloy provided in Example 1, alloy 2 is the aluminum alloy provided in Example 2, and alloy 3 is the aluminum alloy provided in Example 3.

[0042] Figure 2 The figures are yield strength curves of aluminum alloy materials provided in Examples 1 to 3 of the present invention; wherein, alloy 1 is the aluminum alloy provided in Example 1, alloy 2 is the aluminum alloy provided in Example 2, and alloy 3 is the aluminum alloy provided in Example 3.

[0043] Figure 3 This is a schematic diagram of the overall structure of the suspended packer provided by the present invention.

[0044] Figure 4 A partial schematic diagram illustrating the structure of the rubber sleeve.

[0045] Figure 5 This is a schematic diagram illustrating a partial structure of the hydraulic cylinder assembly.

[0046] In the diagram: 1. Central tube; 21. First cylinder; 22. Second cylinder; 3. Hard anti-protrusion ring; 41. Second slip; 42. Second cone ring; 43. Anti-rotation ring; 44. Second protective pin; 51. Protective sleeve; 52. First cone ring; 53. First protective pin; 54. First slip; 55. Support ring; 611. Lower connector; 612. First cylinder; 613. Isolation sleeve; 621. Second cylinder; 622. Fixing sleeve; 63. Starting pin; 64. Protective ring; 71. Anti-reverse seat; 72. Anti-reverse component; 73. Locking sleeve. Detailed Implementation

[0047] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0048] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments should not be construed as limiting the scope of the invention. Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the drawings are not necessarily drawn to actual scale; for example, the thickness, width, length, or distance of some units may be enlarged relative to other structures.

[0049] The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0050] Aluminum alloy material

[0051] Example 1

[0052] This embodiment provides an aluminum alloy material comprising the following components in the following mass ratio:

[0053] Cu: 5.71%, Mg: 0.67%, Ag: 0.75%, Mn: 0.24%, Zr: 0.13%, balance Al.

[0054] The preparation method of the aluminum alloy is as follows: Alloy elements are proportioned and alloy ingots are prepared using existing casting methods. The ingots are then subjected to homogenization treatments at 420℃ for 6 hours and 515℃ for 6 hours, followed by rolling into thin plates of approximately 1.5 mm at 470℃. The thin plates are then solution-treated at 515℃ for 6 hours, water-quenched to room temperature, and aged at 165℃. The under-aged alloy (165℃ for 2 hours) is then subjected to a heat exposure test at 200℃ in a constant temperature drying oven for 0 hours, 100 hours, 300 hours, 500 hours, 700 hours, and 1000 hours. Tensile tests are then performed to obtain the yield strength and tensile strength.

[0055] Example 2

[0056] This embodiment provides an aluminum alloy material comprising the following components in the following mass ratio:

[0057] Cu: 4.62%, Mg: 0.49%, Ag: 0.56%, Mn: 0.32%, Zr: 0.14%, balance Al.

[0058] The aluminum alloy material in this embodiment is prepared using the same method as in Example 1.

[0059] Example 3

[0060] This embodiment provides an aluminum alloy material comprising the following components in the following mass ratio:

[0061] Cu: 5.68%, Mg: 0.63%, Ag: 0.50%, Mn: 0.32%, Zr: 0.14%, balance Al.

[0062] The aluminum alloy material in this embodiment is prepared using the same method as in Example 1.

[0063] Comparative Example 1

[0064] This comparative example uses 2A43 series aluminum alloy. After holding the 2A43 series aluminum alloy at 200℃ for 100h, it is subjected to high-temperature short-time tensile testing, and its yield strength and tensile strength are measured respectively.

[0065] Comparative Example 2

[0066] This comparative example uses 2A12 series aluminum alloy. After holding the 2A12 series aluminum alloy at 150℃ for 100h, it is subjected to high-temperature short-time tensile testing, and its yield strength and tensile strength are measured respectively.

[0067] Comparative Example 3

[0068] This comparative example uses 2024 series aluminum alloy. After holding the 2024 series aluminum alloy at 150℃ for 100h, it is subjected to high-temperature short-time tensile testing, and its yield strength and tensile strength are measured respectively.

[0069] Comparative Example 4

[0070] This comparative example uses 2014 series aluminum alloy. After holding the 2014 series aluminum alloy at 150℃ for 100h, it is subjected to high-temperature short-time tensile testing, and its yield strength and tensile strength are measured respectively.

[0071] Comparative Example 5

[0072] This comparative example provides an aluminum alloy material comprising the following components in the following mass ratio:

[0073] Cu: 6%, Mg: 0.4%, Ag: 0.4%, Mn: 0.45%, Zr: 0.18%, balance Al.

[0074] The aluminum alloy used in this comparative example was prepared using the same method as in Example 1. The treated aluminum alloy was subjected to a heat exposure test at 150°C in a constant temperature drying oven for 100 hours, followed by a tensile test to obtain the yield strength and tensile strength.

[0075] Comparative Example 6

[0076] This comparative example provides an aluminum alloy material comprising the following components in the following mass ratio:

[0077] Cu: 4.1%, Mg: 0.75%, Ag: 0.85%, Mn: 0.45%, Zr: 0.09%, balance Al.

[0078] The aluminum alloy used in this comparative example was prepared using the same method as in Example 1. The treated aluminum alloy was subjected to a heat exposure test at 150°C in a constant temperature drying oven for 100 hours, followed by a tensile test to obtain the yield strength and tensile strength.

[0079] Alloy parts prepared in each embodiment and comparative example were subjected to high-temperature short-time tensile testing after being held at the corresponding temperature for a certain time. Their yield strength and tensile strength were measured respectively, and the results are shown in Table 1.

[0080] Table 1. Tensile results of the examples and comparative examples.

[0081]

[0082] As shown in Table 1, the aluminum alloy material provided by this invention, compared to 2A43 series aluminum alloys, still exhibits higher yield strength and tensile strength even with a reduced silver content. Furthermore, it retains relatively high yield strength and tensile strength even after 1000 hours of heat exposure. Additionally, since yield strength and tensile strength tend to decrease with increasing heat exposure temperature, the aluminum alloy material provided by this invention demonstrates more significant performance advantages compared to other comparative examples. It is not only suitable for high-temperature environments downhole (above 180°C) but also maintains high performance even after prolonged use at high temperatures. Furthermore, the yield strength and tensile strength data of the aluminum alloy materials in Examples 1 to 3 at different heat exposure times are as follows: Figure 1 and Figure 2 As shown, its yield strength and tensile strength gradually decrease with increasing heat exposure time.

[0083] Corrosion-resistant parts

[0084] This invention provides a corrosion-resistant component, comprising a substrate and a coating on the surface of the substrate. The substrate is made of the aluminum alloy material provided in the above embodiments. The coating includes a first coating and a second coating, wherein the first coating is disposed between the substrate and the second coating. The first coating is a nickel coating, and the second coating is a copper coating. The thickness of the first coating is 9-11 μm, and the thickness of the second coating is 88-104 μm. Preferably, the thickness of the first coating is 10 μm, and the thickness of the second coating is 100 μm.

[0085] Both the first and second coatings are processed by electroplating. Experiments have shown that the corrosion-resistant parts provided by this invention can meet the requirements of 20% hydrochloric acid for more than 9 hours at 180℃ and 20% hydrochloric acid environment.

[0086] Suspended packer

[0087] like Figures 3 to 5 As shown, this invention provides a suspended packer, comprising a central tube 1, a rubber sleeve, rigid anti-push rings 3, a fixed pressure application component, a sliding pressure application component, and a hydraulic cylinder assembly. The rubber sleeve, rigid anti-push rings 3, fixed pressure application component, sliding pressure application component, and hydraulic cylinder assembly are all sleeved on the central tube 1. The rubber sleeve can slide on the central tube 1. Two rigid anti-push rings 3 are fixed on each side of the rubber sleeve. The fixed pressure application component and the sliding pressure application component are located on opposite sides of the two rigid anti-push rings 3. The fixed pressure application component is fixed in position on the axis of the central tube 1. The hydraulic cylinder assembly is used to push the sliding pressure application component toward the fixed pressure application component. The rubber sleeve is made of fluororubber. The central tube 1, rigid anti-push rings 3, fixed pressure application component, sliding pressure application component, and hydraulic cylinder assembly are all corrosion-resistant parts provided by this invention, i.e., all are processed from the aluminum alloy material provided by this invention, and the surfaces of the components are provided with corresponding coatings.

[0088] The inner and outer surfaces of the rubber sleeve are cylindrical surfaces collinear with the axis of the central tube 1. The two end faces of the rubber sleeve are symmetrically arranged conical surfaces, with the sides of the two conical surfaces away from the central tube 1 inclined towards each other. Each rigid anti-outburst ring 3 is attached to the corresponding outer end face of the rubber sleeve and the conical surface of the rubber sleeve. The two sides of the two rigid anti-outburst rings 3 that are away from each other are symmetrical conical surfaces, with the sides of the two conical surfaces away from the central tube 1 inclined towards each other. The two end faces of the fixed pressure application component and the sliding pressure application component that are close to each other are perpendicular to the axis of the central tube 1. The rigid anti-outburst rings 3 provide auxiliary support for the compressed rubber sleeve. Combined with the conical surface design of the rubber sleeve, this reduces deformation at both ends of the rubber sleeve, making the pressure distribution at the contact point between the rubber sleeve and the well wall more uniform. This helps improve the setting stability of the packer and extend its service life.

[0089] Specifically, the rubber tube is composed of a first cylinder 21 and two second cylinders 22. The first cylinder 21 is located between the two second cylinders 22 and is tightly fitted to the two second cylinders 22 to improve the load-bearing capacity of the rubber tube and further improve the stability of the packer. The two conical surfaces of the rubber tube are the two opposite ends of the two second cylinders 22.

[0090] Specifically, the two ends of the first cylinder 21 are also symmetrically arranged conical surfaces. The two conical surfaces are inclined towards each other on the side away from the central pipe 1, so that the pressure distribution at the contact point between the first cylinder 21 and the well wall is more uniform.

[0091] Specifically, the angle between the conical surface of the rigid anti-bulging ring 3 furthest from the rubber sleeve and the axis of the central tube 1 is greater than the angle between the conical surface of the rubber sleeve and the axis of the central tube 1. Along the radial direction of the rigid anti-bulging ring 3, the farther away from the central tube 1, the greater the supporting force provided by the rigid anti-bulging ring 3 to the rubber sleeve, thus improving the supporting effect of the rigid anti-bulging ring 3 on the rubber sleeve.

[0092] Specifically, the hydraulic cylinder assembly includes a lower connector 611, an isolation sleeve 613, and a first cylinder body 612. The lower connector 611 is sleeved and fixed on the central tube 1. The isolation sleeve 613 is sleeved and slidably sealed on the lower connector 611. The first cylinder body 612 is sleeved on the central tube 1 and slides linearly on the central tube 1, with its end away from the sliding pressure application assembly located between the isolation sleeve 613 and the central tube 1. The lower connector 611, isolation sleeve 613, first cylinder body 612, and central tube 1 form a first hydraulic chamber. A first injection hole communicating with the first hydraulic chamber is provided on the central tube 1. The end of the first cylinder body 612 near the sliding pressure application assembly is used to push the sliding pressure application assembly toward the fixed pressure application assembly.

[0093] Specifically, the hydraulic cylinder assembly also includes a starting pin 63, which passes through the isolation sleeve 613 and connects to the lower connector 611. The shear strength of the starting pin 63 limits the starting pressure of the first cylinder body 612 of the hydraulic cylinder, thus preventing accidental starting of the first cylinder body 612. Multiple starting pins 63 are provided in the suspension packer, and all starting pins 63 are circumferentially distributed around the axis of the central tube 1.

[0094] Specifically, the hydraulic cylinder assembly further includes a fixed sleeve 622 and a second cylinder body 621. The fixed sleeve 622 is fitted and fixed onto the central tube 1, located inside the first cylinder body 612 and slidably sealed to it. The second cylinder body 621 is fitted onto the central tube 1, with its end near the fixed sleeve 622 between the first cylinder body 612 and the central tube 1. The fixed sleeve 622, the first cylinder body 612, the second cylinder body 621, and the central tube 1 form a second hydraulic chamber. The central tube 1 has a second injection hole communicating with the second hydraulic chamber. The end of the second cylinder body 621 near the sliding pressure component is used to push the sliding pressure component toward the fixed pressure component. By using segmented pressure application between the first and second hydraulic chambers, the stability of the hydraulic drive is improved.

[0095] Specifically, the hydraulic cylinder assembly also includes a protective ring 64, which is sleeved and fixed on the lower connector 611. The protective ring 64 is located on the side of the isolation sleeve 613 away from the rubber tube and is used to define the position of the isolation sleeve 613, so that there is a gap between the first cylinder body 612 and the lower connector 611, and a gap between the second cylinder body 621 and the fixed sleeve 622, so as to facilitate the injection of fluid pressurization into the first hydraulic chamber and the second hydraulic chamber.

[0096] The suspension packer also includes a backstop assembly, which is also a corrosion-resistant component provided by the present invention. The backstop assembly includes a backstop element 72 and a backstop seat 71. The backstop element 72 is fixed relative to the second cylinder 621, and the backstop seat 71 is fixed on the outside of the central tube 1. The backstop element 72 and the backstop seat 71 cooperate with each other. The backstop seat 71 is provided with ratchet teeth that cooperate with the backstop element 72. Under the limitation of the ratchet teeth, the backstop element 72 can only move towards the fixed pressure assembly on the backstop seat 71, effectively preventing the second cylinder 621 from retracting.

[0097] Specifically, the anti-reverse assembly also includes a locking sleeve 73 sleeved on the central tube 1. The locking sleeve 73 is inserted between the second cylinder 621 and the central tube 1 and is fixedly connected to the second cylinder 621. The anti-reverse component 72 is fixedly connected to the locking sleeve 73.

[0098] Specifically, the anti-reverse seat 71 is a spring anti-reverse seat, which includes a ratchet and a spring. The spring is located between the ratchet and the central tube 1, so that the ratchet and the anti-reverse component 72 are tightly engaged, which not only achieves the anti-reverse effect, but also makes it less likely to cause the wall of the second cylinder 621 to jump, thus helping to protect the second cylinder 621.

[0099] Specifically, the sliding pressure application assembly includes a first conical ring 52, a first slip 54, a support ring 55, and a protective sleeve 51. The support ring 55 is fitted onto the central tube 1, with its end away from the rubber sleeve inserted between the locking sleeve 73 and the central tube 1, and fixedly connected to the locking sleeve 73. The first slip 54 is fitted onto and fixed to the support ring 55. The first conical ring 52 is located between the rubber sleeve and the support ring 55, with the end of the first conical ring 52 away from the rubber sleeve being a conical surface that tapers inwards. The protective sleeve 51 is located between the central tube 1 and the first slip 54, and also between the first conical ring 52 and the support ring 55. As the distance between the fixed pressure application assembly and the first conical ring 52 decreases, the protective sleeve 51 experiences increased force, causing the rubber sleeve to deform and press against the well wall. Once the protective sleeve 51 meets the required force, it deforms or cracks, and then the first conical ring 52 wedges into the first slip 54, locking its position on the central tube 1 by friction.

[0100] Specifically, the fixed pressure application assembly includes a second conical ring 42 and a second slip 41. The second slip 41 is fitted onto the central tube 1, and its position on the axis of the central tube 1 is fixed. The second conical ring 42 is located between the second slip 41 and the rubber sleeve. The end of the second conical ring 42 away from the rubber sleeve is a conical surface, which tapers inward at the end away from the rubber sleeve. The second conical ring 42 is used to wed into the second slip 41, locking the position of the second conical ring 42 on the central tube 1 by means of friction.

[0101] To enhance the anchoring capability of the suspension packer and prevent the fracturing string from shifting upwards due to the enormous reaction force generated during fracturing, both the first and second slips are inlaid with toothed blocks on their inner surfaces. These toothed blocks, made of tungsten carbide particles, are used for anchoring. Tungsten carbide is characterized by its high hardness and sharpness, allowing it to be firmly anchored to the casing. Simultaneously, the particles detach during drilling out of the slips, ensuring drillability. The tungsten carbide particles used in the toothed blocks have a diameter of 9-10 mm, protrude 7 mm from the inner surface of the slip, and have a hardness of 91 HRA. Each slip has 24 tungsten carbide particles embedded on its inner surface. Furthermore, both the first and second slips are circumferentially cracked, with the crack direction aligned with the axis of the first or second slip. The crack width is 2 mm and the depth is 8 mm. The ultimate load capacity of the first and second slips is 75.6 tons.

[0102] The suspension packer also includes a first protective pin 53, which passes through the first conical ring 52 and inserts into the wall of the central tube 1. The shear strength of the first protective pin 53 limits the starting pressure of the first conical ring 52 to prevent the first cone from being accidentally activated. Multiple first protective pins 53 are provided in the suspension packer, and all first protective pins 53 are circumferentially distributed around the axis of the central tube 1.

[0103] The suspension packer also includes a second protective pin 44, which passes through the second conical ring 42 and inserts into the wall of the central tube 1. The shear strength of the second protective pin 44 limits the starting pressure of the second conical ring 42, thus preventing the second conical ring 42 from being accidentally activated. Multiple second protective pins 44 are provided in the suspension packer, and all second protective pins 44 are circumferentially distributed around the axis of the central tube 1.

[0104] Specifically, the second slip 41 is fixed relative to the central tube 1, so that the set packer is relatively fixed to the central tube 1, improving the setting stability. The fixed pressure assembly in the suspended packer also includes an anti-rotation ring 43, which is sleeved and fixed on the central tube 1, and the second slip 41 is fixedly connected to the anti-rotation ring 43.

[0105] When using the suspended packer, the fracturing string consisting of "drill pipe + matching feed tool + the above-mentioned suspended packer + lower acid fracturing string + setting ball seat" is sent to the bottom of the well. The suspended packer is then set by dropping the ball and applying pressure: fluid first enters the first hydraulic chamber, pushing the first cylinder 612 to the left. The first cylinder 612, carrying the isolation sleeve 613, moves to the left, pressurizing and shearing the starting pin 63. Fluid then enters the second hydraulic chamber, pushing the second cylinder 621 to the left. The second cylinder 621 pushes the locking sleeve 73 to the left. The anti-reverse element 72 and the anti-reverse seat 71 cooperate to prevent the locking sleeve 73 and the second cylinder 621 from reversing to the right. The pressure in the first and second hydraulic chambers continues to increase. The locking sleeve 73 moves to the left, shearing off the first protective pin 53. The first conical ring 52 moves to the left, squeezing the rubber sleeve. The rubber sleeve then squeezes the second conical ring 42. When the second conical ring 42 is squeezed to the point where the shear strength of the second protective pin 44 is met, the second protective pin 44 shears off, and the second slip 41 is fully seated. The pressure in the first and second hydraulic chambers continues to increase, causing the rubber sleeve to be fully seated. Subsequently, the protective sleeve 51 deforms or cracks, and the second slip 41 crawls along the conical surface of the second conical ring 42 and sits on.

[0106] In summary, the suspended packer provided by this invention uses a rigid anti-outburst ring 3 to provide auxiliary support for the compressed rubber cylinder. Combined with the conical surface design of the rubber cylinder, it reduces the deformation at both ends of the rubber cylinder, making the pressure distribution at the contact point between the rubber cylinder and the well wall more uniform. This helps to improve the setting stability of the packer and extend its service life.

[0107] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An aluminum alloy material, characterized in that, It includes the following components in the following mass ratio: Cu: 4.62-5.71%, Mg: 0.49-0.67%, Ag: 0.5-0.75%, Mn: 0.24-0.32%, Zr: 0.13-0.14%, balance Al.

2. The aluminum alloy material according to claim 1, characterized in that, The mass ratio of each component is: Cu: 4.62-5.68%, Mg: 0.49-0.63%, Ag: 0.5-0.56%, Mn: 0.32%, Zr: 0.14%, balance Al.

3. The aluminum alloy material according to claim 2, characterized in that, The mass ratio of each component is: Cu: 4.62%, Mg: 0.49%, Ag: 0.56%, Mn: 0.32%, Zr: 0.14%, balance Al.

4. A corrosion-resistant component, comprising a substrate and a coating on the surface of the substrate, characterized in that, The substrate is made of the aluminum alloy material described in any one of claims 1-3.

5. The corrosion-resistant component according to claim 4, characterized in that, The coating includes a first coating and a second coating, wherein the first coating is disposed between the substrate and the second coating, the first coating is a nickel coating, and the second coating is a copper coating.

6. The corrosion-resistant component according to claim 5, characterized in that, The thickness of the first coating is 9-11 μm, and the thickness of the second coating is 88-104 μm.

7. The corrosion-resistant component according to claim 6, characterized in that, The thickness of the first coating is 10 μm, and the thickness of the second coating is 100 μm.

8. A suspended packer, characterized in that, Includes the corrosion-resistant component as described in any one of claims 4-7.

9. The suspended packer according to claim 8, characterized in that, The suspension packer also includes a rubber sleeve. The corrosion-resistant component includes a central tube, a rigid anti-protrusion ring, a fixed pressure application component, a sliding pressure application component, and a hydraulic cylinder assembly. The rubber sleeve, rigid anti-protrusion ring, fixed pressure application component, sliding pressure application component, and hydraulic cylinder assembly are all sleeved on the central tube. The rubber sleeve can slide on the central tube. Two rigid anti-protrusion rings are fixed on both sides of the rubber sleeve. The fixed pressure application component and the sliding pressure application component are located on opposite sides of the two rigid anti-protrusion rings. The fixed pressure application component is fixed in position on the axis of the central tube. The hydraulic cylinder assembly is used to push the sliding pressure application component toward the fixed pressure application component.

10. The suspended packer according to claim 9, characterized in that, The inner and outer surfaces of the rubber sleeve are cylindrical surfaces collinear with the axis of the central tube. The two end faces of the rubber sleeve are symmetrically arranged conical surfaces, with the side of the two conical surfaces away from the central tube inclined toward each other. Each rigid anti-protrusion ring is attached to the end of the outer surface of its corresponding rubber sleeve and the conical surface of the rubber sleeve. The two sides of the two rigid anti-protrusion rings that are away from each other are symmetrical conical surfaces, with the side of the two conical surfaces away from the central tube inclined toward each other. The two end faces of the fixed pressure application component and the sliding pressure application component that are close to each other are perpendicular to the axis of the central tube.

11. The suspended packer according to claim 9, characterized in that, The corrosion-resistant component also includes a backstop assembly, which includes a backstop element and a backstop seat. The backstop element is connected to the output end of the hydraulic cylinder assembly, and the backstop seat is fixed on the outside of the central tube. The backstop element and the backstop seat cooperate with each other, and the backstop element can only move towards the fixed pressure assembly on the backstop seat.

12. The suspended packer according to claim 11, characterized in that, The anti-reverse seat is an elastic anti-reverse seat, and the anti-reverse seat is tightly fitted with the anti-reverse component.

13. The suspended packer according to claim 10, characterized in that, The rubber tube is composed of a first tube and two second tubes. The first tube is located between the two second tubes and is tightly fitted to the two second tubes. The two conical surfaces of the rubber tube are the two opposite ends of the two second tubes.

14. The suspended packer according to claim 13, characterized in that, The two ends of the first cylinder are symmetrically arranged conical surfaces, and the two conical surfaces on the side away from the central tube are inclined towards each other.

15. The suspended packer according to claim 14, characterized in that, The angle between the conical surface of the rigid anti-surge ring away from the rubber sleeve and the axis of the central tube is greater than the angle between the conical surface of the rubber sleeve and the axis of the central tube.

16. The suspended packer according to claim 9, characterized in that, The sliding pressure assembly includes a first conical ring, a first slip, a support ring, and a protective sleeve. The support ring is fitted onto the central tube and can slide linearly on the central tube. The first slip is fitted onto and fixed to the support ring. The first conical ring is located between the rubber sleeve and the support ring. The end of the first conical ring away from the rubber sleeve is a conical surface, and the end of the conical surface away from the rubber sleeve contracts inward. The protective sleeve is located between the central tube and the first slip, and between the first conical ring and the support ring. After the rubber sleeve is set, the protective sleeve deforms or cracks, and then the first conical ring wedges into the first slip.

17. The suspended packer according to claim 16, characterized in that, The fixed pressure assembly includes a second conical ring and a second slip; the second slip is sleeved on the central tube and its position on the axis of the central tube is fixed; the second conical ring is located between the second slip and the rubber sleeve, and the end of the second conical ring away from the rubber sleeve is a conical surface, which is concave inward at the end away from the rubber sleeve; the second conical ring is used to wed in the second slip.

18. The suspended packer according to claim 17, characterized in that, Both the first and second slips are inlaid with tooth blocks, which are tungsten carbide particles with a diameter of 9-10 mm.

19. The suspended packer according to claim 18, characterized in that, Both the first and second slips have gaps on their surfaces. The length of the gaps is along the axis of the first or second slip, and the gap width is 2 mm and the depth is 8 mm.

20. The suspended packer according to claim 16, characterized in that, The suspension packer also includes a first protective pin, which passes through the first conical ring and inserts into the central tube wall. The shear fracture of the first protective pin occurs before the protective sleeve deforms or cracks.

21. The suspended packer according to claim 17, characterized in that, The suspension packer also includes a second protective pin and a first protective pin. The second protective pin passes through the second conical ring and inserts into the central tube wall, and the first protective pin passes through the first conical ring and inserts into the central tube wall. The shear fracture of the first protective pin occurs before the shear fracture of the second protective pin, and the shear fracture of the second protective pin occurs before the protective sleeve deforms or cracks.

22. The suspended packer according to claim 9, characterized in that, The hydraulic cylinder assembly includes a lower connector, an isolation sleeve, and a first cylinder body. The lower connector is sleeved and fixed on the central tube. The isolation sleeve is sleeved and slidably sealed on the lower connector. The first cylinder body is sleeved on the central tube and slides linearly on the central tube. The end of the first cylinder body away from the sliding pressure application assembly is between the isolation sleeve and the central tube. The lower connector, isolation sleeve, first cylinder body, and central tube form a first hydraulic chamber. The central tube has a first injection hole communicating with the first hydraulic chamber. The end of the first cylinder body near the sliding pressure application assembly is used to push the sliding pressure application assembly toward the fixed pressure application assembly.

23. The suspended packer according to claim 22, characterized in that, The hydraulic cylinder assembly also includes a starting pin, which passes through the isolation sleeve and connects to the lower connector. After the pressure in the first hydraulic chamber meets the shearing requirement of the starting pin, the isolation sleeve slides.

24. The suspended packer according to claim 23, characterized in that, The hydraulic cylinder assembly further includes a fixed sleeve and a second cylinder body. The fixed sleeve is fitted and fixed on the central tube, located inside the first cylinder body, and slidably sealed with the first cylinder body. The second cylinder body is fitted on the central tube, with one end near the fixed sleeve positioned between the first cylinder body and the central tube. The fixed sleeve, the first cylinder body, the second cylinder body, and the central tube together form a second hydraulic chamber. The central tube has a second injection hole communicating with the second hydraulic chamber. The end of the second cylinder body near the sliding pressure component is used to push the sliding pressure component toward the fixed pressure component.

25. The suspended packer according to claim 24, characterized in that, The hydraulic cylinder assembly also includes a protective ring, which is sleeved and fixed on the lower connector and is located on the side of the isolation sleeve away from the rubber tube.

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