Shape memory alloy supporting buckle driving type plugging device

Abstract

The invention relates to the technical field of oil exploitation, and provides a shape memory alloy supporting buckle driving type plugging device. Comprising an oil well casing, an oil pipe is arranged in the oil well casing, a mounting base is fixedly arranged on the peripheral side of the oil pipe, and a plurality of corrosion-resistant high-temperature alloy sealing pieces are rotationally arranged on the mounting base; wherein each section of corrosion-resistant high-temperature alloy sealing part is provided with a shape memory alloy supporting buckle, and when the shape memory alloy supporting buckles deform, all the sections of corrosion-resistant high-temperature alloy sealing parts are attached to the inner wall of the oil well casing pipe to complete sealing. The anti-corrosion high-temperature alloy sealing piece has the beneficial effects that when the temperature reaches the phase change temperature of the shape memory alloy supporting buckle, due to the shape memory effect generated by phase change, the shape memory alloy supporting buckle restores and contracts to be in an initial linear shape, and therefore the anti-corrosion high-temperature alloy sealing piece loses support, and the sealing performance of the anti-corrosion high-temperature alloy sealing piece is improved. And the self-tightening state extends outwards to be tightly attached to the inner wall of the oil well casing, so that plugging is completed.

Description

Technical Field

[0001] The invention relates to the technical field of oil extraction, and in particular to a shape memory alloy supported buckle driven plugging device. Background Art

[0002] Shape memory alloys (SMA) are a new type of smart material with shape memory effect, superelastic effect and high power-to-weight ratio. As driving elements of actuators, they have been widely used in aviation, aerospace, medical and other fields.

[0003] The mechanism using shape memory alloy as the drive generally applies external force to the shape memory alloy first, imposes constraints on the shape memory alloy by mechanical means, and then heats the shape memory alloy. Due to the phase change inside, the shape memory alloy returns to its original shape, showing the shape memory effect, and will generate a certain restoring force when there are constraints at both ends. Due to the difficulties in installing, fixing and insulating shape memory alloys, most shape memory alloy drivers currently have complex structures.

[0004] The packer is a downhole tool used to seal the annulus between the pipe string (or open hole wall) and the wellbore (casing), isolate the target layer, control the injection or production of fluids, and withstand the pressure difference. The sealing parts of the packers used in the current oil production process are all made of rubber materials, which have the advantages of excellent filling and sealing performance, easy to implement setting and unsealing, suitable for various complex well conditions and low price. However, it also has the disadvantages of low strength, small usable internal diameter, low operating temperature, poor high temperature and high pressure resistance, easy aging, short service life, and complex mechanism for setting and unsealing.

[0005] From the above description, it can be seen that the current seals made of rubber materials as the sealing part are difficult to meet the requirements of normal oil extraction in certain specific environments. For example, in a high-temperature corrosive environment, if rubber materials are used, there will be a risk of failure and it is difficult to meet the sealing requirements. Therefore, it is extremely urgent to develop and design a sealing device suitable for oil extraction in a high-temperature environment.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The object of the present invention is to provide a shape memory alloy support buckle driven plugging device to solve the problems existing in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a shape memory alloy support buckle driven plugging device, comprising: an oil well casing, an oil pipe is arranged inside the oil well casing, a mounting base is fixedly arranged on the outer peripheral side of the oil pipe, and a multi-petal corrosion-resistant high-temperature alloy seal is rotatably arranged on the mounting base;

[0009] Among them, each petal of the corrosion-resistant high-temperature alloy seal is provided with a shape memory alloy support buckle. When the shape memory alloy support buckle is deformed, each petal of the corrosion-resistant high-temperature alloy seal fits the inner wall of the oil well casing to complete the sealing.

[0010] In an optional embodiment, the corrosion-resistant high-temperature alloy seals in each petal have the same structure, and each petal comprises a sealing portion, an arc transition portion and a connecting portion; wherein the sealing portion and the arc transition portion are arranged in a direction away from the oil pipe, and the connecting portion is arranged in a direction close to the oil pipe.

[0011] In an optional embodiment, the shape memory alloy support buckle includes a mounting portion, a first support leg and a second support leg; the mounting portion is connected to the threaded hole of the connecting portion of the corrosion-resistant high-temperature alloy seal by a screw passing through a threaded hole therein.

[0012] In an optional embodiment, top ends of the first supporting leg and the second supporting leg are both connected to the mounting portion, an angle between the first supporting leg and the second supporting leg can be changed, and lengths of the first supporting leg and the second supporting leg can be changed.

[0013] In an optional embodiment, the corrosion-resistant high-temperature alloy seal is configured with four petals, eight petals or sixteen petals, and all of the corrosion-resistant high-temperature alloy seals expand outward or contract inward in the form of petals.

[0014] The beneficial effect of the present invention is that: a shape memory alloy support buckle is used as a driving mechanism of the plugging device, the shape memory alloy support buckle is heat-set before installation to "remember" the "I" shape at high temperature, and then bent into a triangle by mechanical external force, and the fully formed shape memory alloy support buckle is fixed to the bottom of the corrosion-resistant high-temperature alloy seal by screws during installation, and the corrosion-resistant high-temperature alloy seal is placed in the installation base. When the packer is working, the corrosion-resistant high-temperature alloy seal is rotated inward and converged, and then the bent shape memory alloy support buckle is used to support the corrosion-resistant high-temperature alloy seal, and then the whole set of devices is moved to the working position, and the whole device is heated when it is needed to be set, and when the temperature reaches the phase change temperature of the shape memory alloy support buckle, due to the shape memory effect generated by the phase change, the shape memory alloy support buckle is restored, and it shrinks to the initial "I" shape, so that the corrosion-resistant high-temperature alloy seal loses support, and extends outward from the converged state to close to the inner wall of the oil well casing, thereby completing the plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic structural diagram of a shape memory alloy supported buckle driven sealing device provided in one embodiment of the present invention.

[0017] Figure 2 It is a left view of the supporting part of the shape memory alloy supporting buckle provided in one embodiment of the present invention before deformation recovery occurs.

[0018] Figure 3 The shape memory alloy support buckle provided in one embodiment of the present invention undergoes deformation recovery to enable the corrosion-resistant high-temperature alloy seal

[0019] Schematic diagram of the sealing action completed after outward rotation and deformation.

[0020] Figure 4 It is a left view of the supporting part of the shape memory alloy supporting buckle provided in one embodiment of the present invention after deformation recovery.

[0021] Figure 5 It is a schematic diagram of a shape memory alloy support buckle before and after deformation provided in one embodiment of the present invention.

[0022] Wherein, the accompanying drawings are marked as follows:

[0023] 1-oil pipe; 2-oil well casing; 3-corrosion-resistant high-temperature alloy seal, 31-sealing part, 32-arc transition part, 33-connecting part; 4-shape memory alloy support buckle, 41-installation part, 42-first support leg, 43-second support leg; 5-installation base. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] Please see attached Figure 1-5 The purpose of this embodiment is to provide a shape memory alloy support buckle driven plugging device, including: an oil well casing 2, an oil pipe 1 is arranged in the oil well casing 2, a mounting base 5 is fixedly arranged on the outer peripheral side of the oil pipe 1, and a plurality of petals of corrosion-resistant high-temperature alloy seals 3 are rotatably arranged on the mounting base 5, and the corrosion-resistant high-temperature alloy seals 3 are arranged to have four petals, eight petals or sixteen petals, and all the corrosion-resistant high-temperature alloy seals 3 are expanded outward or contracted inward in the form of petals; wherein each petal of the corrosion-resistant high-temperature alloy seal 3 is provided with a shape memory alloy support buckle 4, and when the shape memory alloy support buckle 4 is deformed, each petal of the corrosion-resistant high-temperature alloy seal 3 adheres to the inner wall of the oil well casing 2 to complete the sealing.

[0027] Specifically, the corrosion-resistant high-temperature alloy seal 3 of each petal has the same structure, and each petal includes a sealing portion 31, an arc transition portion 32, and a connecting portion 33; wherein the sealing portion 31 and the arc transition portion 32 are arranged in a direction away from the oil pipe 1, and the connecting portion 33 is arranged in a direction close to the oil pipe 1. The above structure (center of gravity is biased outward) makes it easier for the corrosion-resistant high-temperature alloy seal 3 to be extended outward.

[0028] In this embodiment, the shape memory alloy support buckle 4 includes a mounting portion 41, a first support leg 42 and a second support leg 43; the mounting portion 41 is connected to the threaded hole of the connecting portion 33 of the corrosion-resistant high-temperature alloy seal 3 by screws passing through the threaded hole therein. The top ends of the first support leg 42 and the second support leg 43 are both connected to the mounting portion 41, the angle between the first support leg 42 and the second support leg 43 can be changed, and the lengths of the first support leg 42 and the second support leg 43 can be changed, so the support is stable and easy to adjust.

[0029] The inner side of the top of the corrosion-resistant high-temperature alloy seal 3 may have a certain taper according to the actual working conditions, so that when the system is actuated, the liquid from the top of the system can press the corrosion-resistant high-temperature alloy seal 3 tighter in the radial direction to ensure the sealing performance; the mounting base 5 should meet a certain match with the corrosion-resistant high-temperature alloy seal 3 in size, so that it can move up and down in the gap between the oil pipe 1 and the oil well casing 2 before it rotates and deforms, and the diameter of the mounting base should ensure that the corrosion-resistant high-temperature alloy seal is tightly attached to the inner wall of the oil well casing 2 after rotating and deforming outward;

[0030] In addition, the mounting base 5 and the corrosion-resistant high-temperature alloy seal 3 should be made of high-temperature corrosion-resistant alloy (such as 304H stainless steel) to meet the requirements of the high temperature and corrosive environment of the current shale oil in-situ conversion production wellbore, so that it can be used for a long time. The shape memory alloy support buckle 4 should be made of a shape memory alloy with shape memory effect (usually nickel-titanium alloy is selected) so that it has a good shape memory effect. After being pre-strained and bent, it can recover and shrink when heated, so that the corrosion-resistant high-temperature alloy seal loses support and rotates outward to complete the drive; the mounting base 5 and the oil pipe 1 can be designed with different size structures or different matching methods according to the requirements of the application environment.

[0031] When installing the isolation system, the shape memory alloy support buckle 4 is installed on the bottom of the corrosion-resistant high-temperature alloy seal 3 by screws, the inner side of the installation base 5 is connected to the outer side of the oil pipe 1 by threads, and then the bottom of each piece of the corrosion-resistant high-temperature alloy seal 3 divided according to the working conditions is connected to the installation base 5, and the shape memory alloy support buckle 4 is bent to provide support for the corrosion-resistant high-temperature alloy seal 3. Before installation, lubricant should be applied to the contact parts of each component to ensure smooth setting action.

[0032] When the plugging device is working in the application scenario, the whole system is heated, and the shape memory alloy support buckle 4 after being heated will produce shape recovery due to the shape memory effect, as shown in the schematic diagram. Figure 5As shown, the shape memory effect restores its shape to the initial "I" shape, thereby releasing the restraint on the contracted corrosion-resistant high-temperature alloy seal 3, and the corrosion-resistant high-temperature alloy seal 3 will rotate outward again and rebound to fit tightly with the oil well casing 2, thereby achieving the sealing function.

[0033] Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shape memory alloy support buckle driven plugging device, characterized in that: include: An oil well casing (2), wherein an oil pipe (1) is arranged inside the oil well casing (2), a mounting base (5) is fixedly arranged on the outer peripheral side of the oil pipe (1), and a multi-petal corrosion-resistant high-temperature alloy seal (3) is rotatably arranged on the mounting base (5); Wherein, each petal of the corrosion-resistant high-temperature alloy seal (3) is provided with a shape memory alloy support buckle (4), and when the shape memory alloy support buckle (4) is deformed, each petal of the corrosion-resistant high-temperature alloy seal (3) fits the inner wall of the oil well casing (2) to complete the sealing.

2. The shape memory alloy support buckle driven plugging device according to claim 1, characterized in that: The corrosion-resistant high-temperature alloy seals (3) described in each petal have the same structure, and each petal of the corrosion-resistant high-temperature alloy seal (3) includes a sealing portion (31), an arc transition portion (32) and a connecting portion (33); wherein the sealing portion (31) and the arc transition portion (32) are arranged in a direction away from the oil pipe (1), and the connecting portion (33) is arranged in a direction close to the oil pipe (1).

3. The shape memory alloy support buckle driven plugging device according to claim 2, characterized in that: The shape memory alloy support buckle (4) comprises a mounting portion (41), a first support leg (42) and a second support leg (43); the mounting portion (41) is connected to the threaded hole of the connecting portion (33) of the corrosion-resistant high-temperature alloy seal (3) by means of a screw passing through a threaded hole therein.

4. The shape memory alloy support buckle driven plugging device according to claim 3, characterized in that: The top ends of the first supporting leg (42) and the second supporting leg (43) are both connected to the mounting portion (41); the angle between the first supporting leg (42) and the second supporting leg (43) can be changed, and the lengths of the first supporting leg (42) and the second supporting leg (43) can be changed.

5. The shape memory alloy support buckle driven plugging device according to claim 2, characterized in that: The corrosion-resistant high-temperature alloy seal (3) is configured to have four petals, eight petals or sixteen petals, and all of the corrosion-resistant high-temperature alloy seals (3) are spread outward or contracted inward in the form of petals.

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