Corrosion-resistant oil well packer and method of using same

Abstract

The present application relates to the technical fields of packer, and discloses a corrosion-resistant packer for oil well and a using method thereof, which comprises an input pipe and an output pipe, the output pipe is vertically inserted into the input pipe and is in communication with each other, a packer body is slidably arranged on the inner wall of the input pipe along the axis, the packer body is slid by the flow impact at both ends, the outer wall of the packer body is provided with an input pipe annular sealing ring at both ends, the outer wall of the packer body is further provided with a sealing pipe which is inserted into the output pipe, and the outer wall of the sealing pipe is provided with an output pipe annular sealing ring. The oil liquid is extruded into the cavity in the input pipe annular sealing ring, so that the input pipe annular sealing ring is in an expanded state, the input pipe annular sealing ring is tightly attached to the inner wall of the input pipe, and the sealing effect of the packer body and the inner wall of the input pipe is achieved, therefore, as long as the liquid impact on the packer body, the input pipe annular sealing ring can be opened to complete the sealing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packer, in particular to a corrosion-resistant packer for oil well and a use method thereof. BACKGROUND

[0002] In the process of oil field operation, the downhole layering operation is often carried out in the condition of containing carbon dioxide and other corrosive media. The packer used does not have corrosion prevention function, and corrosion damage often occurs, resulting in construction failure. In the process of oil field operation, multiple pipelines are usually connected to each other, and then the corresponding materials are discharged through the same pipeline, for example, the use of T-shaped pipeline. The conventional packer cannot realize the following operation:

[0003] Firstly, the conventional packer can only seal one complete pipeline, but cannot achieve zoned sealing for T-shaped pipeline, that is, cannot control the flow direction by sealing, and the traditional packer cannot select sealing according to the flow direction.

[0004] Secondly, the existing packer usually only has one sealing, that is, only one rubber ring is used to seal between the packer body and the pipeline. This will undoubtedly lead to sealing failure due to pressure and other factors, so multiple sealing is required. However, there is no additional technical means for this scheme in the prior art.

[0005] Therefore, the present application provides a corrosion-resistant packer for oil well and a use method thereof. SUMMARY

[0006] The present application aims to solve the problem that the conventional packer in the prior art can only seal one complete pipeline, but cannot achieve zoned sealing for T-shaped pipeline, and provides a corrosion-resistant packer for oil well and a use method thereof.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0008] The corrosion-resistant packer for oil well comprises an oil well input pipe and an oil well output pipe. The oil well output pipe is vertically inserted into the oil well input pipe and is in communication with each other. A packer body is slidably arranged on the inner wall of the oil well input pipe along the axis. The packer body is slid by the flow impact at both ends. Input pipe annular sealing rings are arranged at both ends of the outer side wall of the packer body. A sealing insert pipe is arranged on the outer side wall of the packer body and inserted into the oil well output pipe. Output pipe annular sealing rings are arranged on the outer side wall of the sealing insert pipe.

[0009] Preferably, first and second limiting rings are fixed on the inner wall of the oil well input pipe. The packer body is located between the first and second limiting rings. The packer body is slid along the axis on the inner wall of the oil well input pipe through the sliding groove and the sliding block. The sealing insert pipe faces the oil well output pipe.

[0010] Preferably, the packer body is provided with a first extrusion cavity and a second extrusion cavity at both ends respectively, the first extrusion cavity and the second extrusion cavity are filled with oil, and a blocking film is arranged in the first extrusion cavity and the second extrusion cavity, the blocking film is a curved surface film, a cavity is arranged in the annular blocking ring of the input pipe, and the two annular blocking rings of the input pipe at both ends of the packer body are respectively communicated with the first extrusion cavity and the second extrusion cavity through a plurality of communication pipes.

[0011] Preferably, the packer body is provided with a first movable cavity and a second movable cavity, the first movable cavity and the second movable cavity are communicated with the first extrusion cavity and the second extrusion cavity through a through hole, and a plug rod sliding along the axis is arranged between the first extrusion cavity and the first movable cavity and between the second extrusion cavity and the second movable cavity, and a sealing rubber layer is arranged on the outer side wall of the plug rod.

[0012] Preferably, the plug rod slides along the axis in the packer body through the through hole, and a tray and a pressing piston are arranged at both ends of the plug rod respectively, the pressing piston drives the plug rod to extend and retract through a second return spring, and the tray abuts against the blocking film.

[0013] Preferably, the packer body is further provided with an annular groove, the axis of the annular groove is perpendicular to the axis of the packer body, the blocking plug pipe slides in the annular groove, and the blocking plug pipe is provided with a curved surface matched with the outer side wall of the packer body on the side facing the output pipe of the oil well.

[0014] Preferably, the first movable cavity and the second movable cavity are communicated with the annular groove through a second communication hole, the first movable cavity, the second movable cavity and the annular groove are filled with oil, and the blocking plug pipe slides in the annular groove through a first return spring.

[0015] Preferably, the blocking plug pipe is provided with a first communication hole, the annular blocking ring of the output pipe is provided with an expansion cavity, and the expansion cavity is communicated with the annular groove through the first communication hole.

[0016] Preferably, the input pipe annular blocking ring and the output pipe annular blocking ring are made of perfluorinated rubber.

[0017] The use method of the oil well corrosion-resistant packer is as follows:

[0018] S1: first, place the packer body in the input pipe of the oil well by disassembling and assembling, then input different types of liquid from both ends of the input pipe of the oil well, when one type of liquid needs to be blocked, only the input state of one type of liquid needs to be closed, and the input state of the other type of liquid is continuous, for example, the liquid in the input state first impacts slowly on the top of the packer body, so that the packer body abuts against the second limiting ring, at this time, the packer body does not block the output pipe of the oil well, so the liquid in the input state impacts on the top of the packer body, then turns into the output pipe of the oil well, and flows out from the output pipe of the oil well, while the other type of liquid is blocked by the packer body.

[0019] S2: Then increase the liquid flow rate, when the liquid impact on the top of the packer body, the originally inflated sealing membrane is concave under the impact of the liquid, at the same time, the push rod in the first extrusion cavity is pushed down, when the sealing membrane is concave, the oil in the first extrusion cavity is extruded, and the oil enters the input pipe annular sealing ring in the same horizontal plane of the first extrusion cavity along the communication pipe, that is, the oil is extruded into the cavity of the input pipe annular sealing ring, so that the input pipe annular sealing ring is in an inflated state, and at this time, the input pipe annular sealing ring is tightly attached to the inner wall of the oil well input pipe, thereby completing the sealing effect of the packer body and the inner wall of the oil well input pipe, that is, as long as the liquid impacts on the packer body, the input pipe annular sealing ring can be opened to complete the sealing.

[0020] S3: When the push rod in the first extrusion cavity is pushed down, the oil below the pressing piston in the first movable cavity can be extruded into the annular groove through the second communication hole, and at this time, the oil below the pressing piston in the first movable cavity cannot push the sealing cannula away from the annular groove.

[0021] S4: When it is necessary to terminate the flow of any kind of liquid out of the oil well output pipe, it is only necessary to intermittently slowly introduce liquid into both sides of the oil well input pipe and push the packer body to reciprocate in the oil well input pipe, since the packer body has liquid impact extrusion on both sides, the sealing membrane at both ends can be concave at the same time, so that the oil in the first movable cavity and the second movable cavity can be extruded into the annular groove at the same time, at this time, the sealing cannula can be pushed away from the annular groove, when the packer body carrying the sealing cannula moves to the coaxial position of the oil well output pipe, the sealing cannula is inserted into the oil well output pipe, at the same time, the input pipe annular sealing ring on both sides and the output pipe annular sealing ring on the sealing cannula are opened, so that triple sealing of the oil well input pipe and the oil well output pipe can be achieved.

[0022] The beneficial effects of the present application are:

[0023] 1、The oil is extruded into the cavity of the input pipe annular sealing ring, so that the input pipe annular sealing ring is in an inflated state, at this time, the input pipe annular sealing ring is tightly attached to the inner wall of the oil well input pipe, thereby completing the sealing effect of the packer body and the inner wall of the oil well input pipe, so as long as the liquid impacts on the packer body, the input pipe annular sealing ring can be opened to complete the sealing.

[0024] 2、When the packer body carrying the sealing cannula moves to the coaxial position of the oil well output pipe, the sealing cannula is inserted into the oil well output pipe, at the same time, the input pipe annular sealing ring on both sides and the output pipe annular sealing ring on the sealing cannula are opened, so that triple sealing of the oil well input pipe and the oil well output pipe can be achieved, which prevents any kind of liquid from entering the oil well output pipe. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Structure diagram of the oil well corrosion-resistant packer according to the present application;

[0026] Figure 2 Structure diagram of the single-side flow state of the oil well corrosion-resistant packer according to the present application;

[0027] Figure 3 Structure diagram of the plugging state of the oil well corrosion-resistant packer according to the present application;

[0028] Figure 4 Structure diagram of the packer body of the oil well corrosion-resistant packer according to the present application;

[0029] Figure 5 Structure diagram of the first state of the packer body of the oil well corrosion-resistant packer according to the present application; Figure 4 Structure diagram of the enlarged view of position A in the packer body of the oil well corrosion-resistant packer according to the present application;

[0030] Figure 6 Structure diagram of the enlarged view of position B in the packer body of the oil well corrosion-resistant packer according to the present application; Figure 4 Structure diagram of the second state of the packer body of the oil well corrosion-resistant packer according to the present application;

[0031] Figure 7 Structure diagram of the second state of the packer body of the oil well corrosion-resistant packer according to the present application;

[0032] Figure 8 Structure diagram of the second state of the packer body of the oil well corrosion-resistant packer according to the present application.

[0033] In the figure: 1, oil well input pipe; 2, oil well output pipe; 3, first limiting stop ring; 4, second limiting stop ring; 5, packer body; 6, input pipe annular plugging ring; 7, plugging membrane; 8, plugging insert pipe; 9, first extrusion cavity; 10, second extrusion cavity; 11, communication pipe; 12, insert rod; 13, tray; 14, pressing piston; 15, first movable cavity; 16, second movable cavity; 17, annular groove; 18, first communication hole; 19, output pipe annular plugging ring; 20, second communication hole; 21, first reset spring; 22, second reset spring. DETAILED DESCRIPTION

[0034] With reference to Figures 1-8 , the oil well corrosion-resistant packer comprises an oil well input pipe 1 and an oil well output pipe 2, the oil well output pipe 2 is vertically inserted on the oil well input pipe 1 and is in communication with each other, thus being able to input different types of liquid through both ends of the oil well input pipe 1, and the inner wall of the oil well input pipe 1 is slidably provided with a packer body 5, the packer body 5 is slid by the flow impact at both ends, then pushes the packer body 5 in the oil well input pipe 1, and drives the packer body 5 to complete the plugging operation.

[0035] The first limiting ring 3 and the second limiting ring 4 are fixed on the inner wall of the oil well input pipe 1 respectively, the packer body 5 is located between the first limiting ring 3 and the second limiting ring 4, the packer body 5 slides along the axis in the inner wall of the oil well input pipe 1 through the sliding groove and the sliding block, and the blocking pipe 8 faces the oil well output pipe 2.

[0036] Therefore, for the T-shaped pipe composed of the oil well input pipe 1 and the oil well output pipe 2, the following three blocking modes can be realized:

[0037] Mode one: a kind of liquid flows into from above the oil well input pipe 1, then drives the packer body 5 to impact on the second limiting ring 4 on the oil well input pipe 1 to complete limiting, and then flows out from the oil well output pipe 2;

[0038] Mode two: another kind of liquid flows into from below the oil well input pipe 1, then drives the packer body 5 to impact on the first limiting ring 3 on the oil well input pipe 1 to complete limiting, and then flows out from the oil well output pipe 2;

[0039] Mode three: two kinds of liquids enter the oil well input pipe 1 from above and below the oil well input pipe 1 at the same time, then push the packer body 5 to the oil well output pipe 2, the outer side wall of the packer body 5 is further provided with the blocking pipe 8 inserted into the oil well output pipe 2, and then the blocking pipe 8 is inserted into the oil well output pipe 2 to complete simultaneous blocking of the oil well input pipe 1 and the oil well output pipe 2.

[0040] For the blocking of mode one and mode two:

[0041] Referring to Figures 4-6 The outer side wall of the packer body 5 is provided with an input pipe annular blocking ring 6 at both ends in the state, the liquid in the passing state first impacts slowly on the top of the packer body 5, so that the packer body 5 abuts against the second limiting ring 4, at this time, the packer body 5 does not block the oil well output pipe 2, it needs to be explained that the liquid is slowly injected in the initial state, only to push the packer body 5 to move, and does not have the effect of pushing the oil into the input pipe annular blocking ring 6.

[0042] Therefore, the liquid in the passing state impacts on the top of the packer body 5, then turns into the oil well output pipe 2, and flows out from the oil well output pipe 2, and another kind of liquid is blocked by the packer body 5.

[0043] Then increase the liquid flow rate, the first extrusion cavity 9 and the second extrusion cavity 10 are provided with the blocking film 7, the blocking film 7 is a curved surface film, the plug rod 12 slides in the packer body 5 through the through hole, and the plug rod 12 is provided with the tray 13 and the pressing piston 14 at both ends respectively, the pressing piston 14 drives the plug rod 12 to extend and retract through the second reset spring 22, the tray 13 is in abutment with the blocking film 7, when the liquid impacts on the top of the packer body 5, the originally bulged blocking film 7 is concave under the impact of the liquid, wherein the packer body 5 is provided with the first extrusion cavity 9 and the second extrusion cavity 10 at both ends respectively, the first extrusion cavity 9 and the second extrusion cavity 10 are filled with oil, so that the deformed blocking film 7 extrudes the oil in the first extrusion cavity 9 or the second extrusion cavity 10.

[0044] The input pipe annular blocking ring 6 is provided with a cavity, and the two input pipe annular blocking rings 6 at both ends of the packer body 5 are respectively communicated with the first extrusion cavity 9 and the second extrusion cavity 10 through a plurality of communication pipes 11, so that when the blocking film 7 is concave, the oil in the first extrusion cavity 9 can be extruded to enter the input pipe annular blocking ring 6 at the same horizontal plane of the first extrusion cavity 9 through the communication pipe 11, that is, the oil is extruded into the cavity in the input pipe annular blocking ring 6, so that the input pipe annular blocking ring 6 is in an expanded state, and at this time, the input pipe annular blocking ring 6 is tightly attached to the inner wall of the oil well input pipe 1, thereby completing the sealing effect of the packer body 5 and the inner wall of the oil well input pipe 1.

[0045] Therefore, as long as the liquid impacts on the packer body 5, the input pipe annular blocking ring 6 can be opened to complete the blocking.

[0046] The first movable cavity 15 and the second movable cavity 16 are communicated with the annular groove 17 through the second communication hole 20, the first movable cavity 15, the second movable cavity 16 and the annular groove 17 are filled with oil, the blocking plug 8 slides in the annular groove 17 through the first reset spring 21, the originally bulged blocking film 7 is concave under the impact of the liquid, and the plug rod 12 in the first extrusion cavity 9 is pushed down, the packer body 5 is also provided with the first movable cavity 15 and the second movable cavity 16 symmetrically, the first movable cavity 15 and the second movable cavity 16 are communicated with the first extrusion cavity 9 and the second extrusion cavity 10 through the through hole respectively, and the first extrusion cavity 9 and the first movable cavity 15 and the second extrusion cavity 10 and the second movable cavity 16 are both provided with the plug rod 12 which slides along the axis, and the outer wall of the plug rod 12 is provided with a sealing rubber layer, so that the oil in the first extrusion cavity 9 and the second extrusion cavity 10 cannot be extruded into the first movable cavity 15 and the second movable cavity 16.

[0047] The slow-release hole assembly is arranged in the first movable cavity 15 and the second movable cavity 16, is used for balancing the air pressure change caused by the movement of the pressing piston 14 in the first movable cavity 15 and the second movable cavity 16, and guarantees the stable sliding of the pressing piston 14. The slow-release hole assembly is a prior art and will not be described again.

[0048] When the push rod 12 in the first extrusion cavity 9 is pushed down, the oil below the pressing piston 14 in the first movable cavity 15 can be extruded into the annular groove 17 through the second communication hole 20, and at this time, the oil below the pressing piston 14 in the first movable cavity 15 cannot push the blocking pipe 8 away from the annular groove 17.

[0049] Therefore, when the annular blocking ring 6 of the input pipe is in an expanded state and tightly abuts against the inner wall of the oil well input pipe 1, the sealing effect of the packer body 5 and the inner wall of the oil well input pipe 1 is completed, that is, as long as the liquid impacts on the packer body 5, the annular blocking ring 6 of the input pipe can be expanded to complete the blocking.

[0050] For the third mode of blocking:

[0051] The annular groove 17 is further arranged in the packer body 5, and the axis of the annular groove 17 is perpendicular to the axis of the packer body 5. Only intermittent liquid is needed to be slowly introduced into the oil well input pipe 1 on both sides, and the packer body 5 is pushed to reciprocate in the oil well input pipe 1. Since the liquid on both sides of the packer body 5 is impacted and extruded, the blocking membrane 7 at both ends can be simultaneously changed to a concave state, so that the oil in the first movable cavity 15 and the second movable cavity 16 can be simultaneously extruded into the annular groove 17.

[0052] The blocking pipe 8 is telescopic and slides in the annular groove 17. The blocking pipe 8 is arranged with a curved surface on the side facing the oil well output pipe 2, which is matched with the outer side wall of the packer body 5. Since the oil in the first movable cavity 15 and the second movable cavity 16 enters the annular groove 17, the blocking pipe 8 can be pushed away from the annular groove 17.

[0053] The first communication hole 18 is arranged on the blocking pipe 8, and the output pipe annular blocking ring 19 is arranged on the outer side wall of the blocking pipe 8. The output pipe annular blocking ring 19 is arranged with an expansion cavity, and the expansion cavity is communicated with the annular groove 17 through the first communication hole 18. The material of the input pipe annular blocking ring 6 and the output pipe annular blocking ring 19 is perfluorinated rubber, which has the characteristics of corrosion resistance to carbon dioxide and hydrogen sulfide.

[0054] Therefore, the oil entering the first communication hole 18 enters the expansion cavity in the output pipe annular blocking ring 19, and then the expanded output pipe annular blocking ring 19 abuts against the inner wall of the oil well output pipe 2 due to the abutment of the blocking pipe 8 and the inner wall of the oil well output pipe 2, thereby achieving the blocking of the oil well output pipe 2.

[0055] When the packer body 5 carries the blocking cannula 8 to move to the coaxial position of the oil well output pipe 2, the blocking cannula 8 is inserted into the oil well output pipe 2, and the input pipe annular blocking ring 6 on both sides and the output pipe annular blocking ring 19 on the blocking cannula 8 are expanded, so that the triple blocking of the oil well input pipe 1 and the oil well output pipe 2 can be realized, and any kind of liquid is prevented from entering the oil well output pipe 2.

[0056] The working principle of the present application is as follows:

[0057] S1: First, the packer body 5 is placed in the oil well input pipe 1 by disassembly and installation, then different types of liquids are input from both ends of the oil well input pipe 1, and when one of the liquids needs to be blocked, only the input state of one of the liquids needs to be closed, and the input state of the other liquid is continuous, for example, the liquid in the input state first impacts slowly on the top of the packer body 5, so that the packer body 5 abuts against the second limiting ring 4, at this time the packer body 5 does not block the oil well output pipe 2, so the liquid is impacted on the top of the packer body 5, then turns into the oil well output pipe 2, and flows out of the oil well output pipe 2, while the other liquid is blocked by the packer body 5;

[0058] S2: Then increase the liquid inflow rate, when the liquid impacts on the top of the packer body 5, the originally bulging blocking membrane 7 is concave under the impact of the liquid, and the push rod 12 in the first extrusion cavity 9 is pushed down, when the blocking membrane 7 is concave, the oil in the first extrusion cavity 9 is extruded, so that the oil enters the input pipe annular blocking ring 6 in the same horizontal plane as the first extrusion cavity 9 through the communication pipe 11, that is, the oil is extruded into the cavity in the input pipe annular blocking ring 6, so that the input pipe annular blocking ring 6 is in an inflated state, at this time the input pipe annular blocking ring 6 is tightly attached to the inner wall of the oil well input pipe 1, and the sealing effect of the packer body 5 and the inner wall of the oil well input pipe 1 is completed, that is, as long as the liquid impacts on the packer body 5, the input pipe annular blocking ring 6 can be expanded to complete the blocking;

[0059] S3: When the push rod 12 in the first extrusion cavity 9 is pushed down, the oil below the pressing piston 14 in the first movable cavity 15 is extruded into the annular groove 17 through the second communication hole 20, at this time the oil below the pressing piston 14 in the first movable cavity 15 cannot push the blocking cannula 8 away from the annular groove 17;

[0060] S4: when it is necessary to terminate any one liquid out of the oil well output pipe 2, only need to intermittent slow into the liquid on both sides of the oil well input pipe 1, and push the packer body 5 reciprocating sliding in the oil well input pipe 1, because the packer body 5 both sides have liquid impact extrusion, can be simultaneously both ends of the sealing membrane 7 are changed into concave state, therefore can extrude the oil in the first movable cavity 15 and the second movable cavity 16 into the annular groove 17, at this time can push the sealing cannula 8 away from the annular groove 17, when the packer body 5 carries the sealing cannula 8 moves to the oil well output pipe 2 coaxial position, the sealing cannula 8 is inserted into the oil well output pipe 2, simultaneously open the input pipe annular sealing ring 6 on both sides and the output pipe annular sealing ring 19 on the sealing cannula 8, therefore can realize the triple sealing of the oil well input pipe 1 and the oil well output pipe 2.

[0061] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, should be covered in the protection scope of the present application.

Claims

1. A corrosion-resistant packer for oil well, comprising an oil well input pipe (1) and an oil well output pipe (2), the oil well output pipe (2) being vertically inserted on the oil well input pipe (1) and being in communication with each other, characterized in that, The oil well input pipe (1) is provided with a packer body (5) sliding along the axis of the inner wall of the oil well input pipe (1), the packer body (5) slides through the flow impact at both ends, the outer wall of the packer body (5) is provided with an input pipe annular sealing ring (6) at both ends, the outer wall of the packer body (5) is further provided with a sealing plug pipe (8) inserted into the oil well output pipe (2), the outer wall of the sealing plug pipe (8) is provided with an output pipe annular sealing ring (19), the inner wall of the oil well input pipe (1) is respectively provided with a first limiting ring (3) and a second limiting ring (4), the packer body (5) is located between the first limiting ring (3) and the second limiting ring (4), the packer body (5) slides along the axis of the inner wall of the oil well input pipe (1) through the sliding slot, the sealing plug pipe (8) faces the oil well output pipe (2), the packer body (5) is respectively provided with a first extrusion cavity (9) and a second extrusion cavity (10) at both ends, the first extrusion cavity (9) and the second extrusion cavity (10) are filled with oil, the first extrusion cavity (9) and the second extrusion cavity (10) are respectively provided with a sealing membrane (7), the sealing membrane (7) is an arc membrane, a cavity is formed in the input pipe annular sealing ring (6), and the two input pipe annular sealing rings (6) at both ends of the packer body (5) are respectively communicated with the first extrusion cavity (9) and the second extrusion cavity (10) through a plurality of communication pipes (11), the packer body (5) is further provided with a first movable cavity (15) and a second movable cavity (16) symmetrically, the first movable cavity (15) and the second movable cavity (16) are respectively communicated with the first extrusion cavity (9) and the second extrusion cavity (10) through a through hole, and the first extrusion cavity (9) and the first movable cavity (15) and the second extrusion cavity (10) and the second movable cavity (16) are respectively provided with a plug rod (12) sliding along the axis, the outer wall of the plug rod (12) is provided with a sealing rubber layer, the plug rod (12) slides along the axis in the packer body (5) through the through hole, and the plug rod (12) is respectively provided with a tray (13) and a pressing piston (14) at both ends, the pressing piston (14) drives the plug rod (12) to stretch and retract through a second return spring (22), and the tray (13) abuts against the sealing membrane (7).

2. The corrosion-resistant packer for oil wells according to claim 1, characterized in that, The packer body (5) is further provided with an annular groove (17), and the axis of the annular groove (17) is perpendicular to the axis of the packer body (5), the sealing plug pipe (8) slides in the annular groove (17), and the sealing plug pipe (8) is provided with a curved surface matched with the outer wall of the packer body (5) on the side facing the oil well output pipe (2).

3. The corrosion-resistant packer for oil wells according to claim 2, characterized in that, The first movable cavity (15) and the second movable cavity (16) are communicated with the annular groove (17) through a second communication hole (20), the first movable cavity (15), the second movable cavity (16) and the annular groove (17) are filled with oil, and the sealing plug pipe (8) slides in the annular groove (17) through a first return spring (21).

4. The corrosion-resistant packer for oil wells according to claim 3, characterized in that, The sealing plug pipe (8) is provided with a first communication hole (18), the output pipe annular sealing ring (19) is provided with an expansion cavity, and the expansion cavity is communicated with the annular groove (17) through the first communication hole (18).

5. The corrosion-resistant packer for oil wells according to claim 4, characterized in that, The input pipe annular sealing ring (6) and the output pipe annular sealing ring (19) are made of perfluorinated rubber.

6. A method of using the corrosion resistant packer for oil wells as claimed in claim 5, wherein, The specific operation steps are as follows: S1: first, the packer body (5) is placed in the oil well input pipe (1) by disassembling and assembling, then different types of liquids are input from both ends of the oil well input pipe (1), when one of the liquids needs to be blocked, only the input state of one of the liquids needs to be closed, and the input of the other liquid is continuous, when the liquid with input state impacts slowly on the top of the packer body (5), the packer body (5) abuts against the second limiting ring (4), at this time, the packer body (5) does not block the oil well output pipe (2), so the liquid is impacted on the top of the packer body (5), then turns into the oil well output pipe (2), and flows out from the oil well output pipe (2), and the other liquid is blocked by the packer body (5); S2: then increase the liquid flow rate, when the liquid impacts on the top of the packer body (5), the originally bulging blocking membrane (7) is concave under the impact of the liquid, at the same time, the push rod (12) in the first extrusion cavity (9) is pushed down, when the blocking membrane (7) is concave, the oil in the first extrusion cavity (9) can be extruded, so that the oil enters the input pipe annular blocking ring (6) in the same horizontal plane as the first extrusion cavity (9) through the communication pipe (11), that is, the oil is extruded into the cavity of the input pipe annular blocking ring (6), so that the input pipe annular blocking ring (6) is in an inflated state, at this time, the input pipe annular blocking ring (6) is tightly attached to the inner wall of the oil well input pipe (1), thereby completing the sealing effect of the packer body (5) and the inner wall of the oil well input pipe (1), that is, as long as the liquid impacts on the packer body (5), the input pipe annular blocking ring (6) can be opened to complete the blocking; S3: when the push rod (12) in the first extrusion cavity (9) is pushed down, the oil below the pressing piston (14) in the first movable cavity (15) can be extruded into the annular groove (17) through the second communication hole (20), at this time, the oil below the pressing piston (14) in the first movable cavity (15) cannot push the blocking insert pipe (8) away from the annular groove (17); S4: when it is needed to stop any kind of liquid flowing out of the oil well output pipe (2), only the liquid is intermittently and slowly input on both sides of the oil well input pipe (1), and the packer body (5) is reciprocally slid in the oil well input pipe (1), because the packer body (5) has liquid impact extrusion on both sides, the blocking membrane (7) on both sides can be concave at the same time, so that the oil in the first movable cavity (15) and the second movable cavity (16) can be extruded into the annular groove (17) at the same time, at this time, the blocking insert pipe (8) can be pushed away from the annular groove (17), when the packer body (5) carrying the blocking insert pipe (8) moves to the coaxial position of the oil well output pipe (2), the blocking insert pipe (8) is inserted into the oil well output pipe (2), at the same time, the input pipe annular blocking ring (6) on both sides and the output pipe annular blocking ring (19) on the blocking insert pipe (8) are opened, so that the triple blocking of the oil well input pipe (1) and the oil well output pipe (2) can be realized.

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