A 175MPa anti-vibration durable casing head and its use method

Abstract

The present invention discloses a 175MPa anti-vibration durable casing head and a method for using the same. The present invention relates to the technical field of anti-vibration casing head structures, which include a hanger body, a fixing assembly B for installing and fixing the hanger body, rectangular blocks are welded on the left and right sides of the upper end of the hanger body, and fixing blocks are welded on the left and right sides of the lower end of the hanger body; the locking assembly located on the right side includes a first cylinder body fixed on the top surface of the valve body, a movable plate is fixed on the left end of the first rod, and a U-shaped seat and a clamping block are fixed on the left end surface of the movable plate; the tightening assembly located on the right side includes a bracket fixed on the right side wall of the valve body, a second cylinder body fixed on the bracket, and a base welded on the right side wall of the inner cavity of the valve body, and the extended end of the second rod is hinged to the right end of the connecting rod through the pin II. The beneficial effects of the present invention are: it can prevent the hanger body from vibrating and skewing, and has a longer service life.

Description

Technical Field

[0001] The invention relates to the technical field of anti-vibration casing head structures, in particular to a 175MPa anti-vibration durable casing head and a use method thereof. Background Art

[0002] The process of oil extraction is inseparable from drilling equipment, which is equipped with casing heads. The role of the casing head is to transport the fluid returned from the well. The structure of the casing head used in a drilling equipment is as follows: Figure 1~Figure 3 As shown, it includes a hanger body 1, a fixing component A for installing and fixing the hanger body 1, an upper annular plate 2, a sealing ring 3 and a lower annular plate 4 are sequentially sleeved on the hanger body 1 from top to bottom, the fixing component A includes a valve body 5, a step surface 7 opened in the inner cavity 6 of the valve body 5, threaded holes connected to the inner cavity 6 of the valve body 5 are opened in the left and right side walls of the valve body 5, and top screw caps 8 are threadedly connected in the two threaded holes, and a top screw rod 9 is fixed on the inner end of the top screw cap 8; pressure regulating valves 10 are connected to the left and right side walls of the valve body 5.

[0003] The method of using the casing head is:

[0004] S1. Assemble the casing head. The specific operation steps are as follows:

[0005] S11, the worker inserts the hanger body 1 into the inner cavity 6 of the valve body 5 of the fixing assembly A from top to bottom, and ensures that the lower annular plate 4 of the hanger body 1 is supported on the step surface 7 of the valve body 5, thereby achieving the preliminary installation of the hanger body 1;

[0006] S12, the worker tightens the top screw caps 8 located on the left and right sides of the valve body 5, and the top screw caps 8 drive the top screw rods 9 to move inward synchronously. The two top screw rods 9 are respectively pressed against the left and right sides of the upper annular plate 2 of the hanger body 1, thereby fixing the hanger body 1 in the valve body 5, and then assembling the casing head;

[0007] S2. The worker fixes the bottom end of the valve body 5 of the casing head on the top of the drilling equipment and ensures that the inner cavity 6 of the valve body 5 is connected to the drilling equipment;

[0008] S3. After the drilling operation is completed, the fluid returned from the wellhead passes through the drilling equipment, the inner cavity 6 of the valve body 5, the hollow channel of the hanger body 1, and finally flows into the next-level pipeline. The flow direction of the fluid is as follows: Figure 4 As shown by the solid arrow in the middle, workers can adjust the pressure of the fluid by starting or closing the relevant valve on the control valve body 5.

[0009] However, although this casing head can be used, it still has the following technical defects:

[0010] Since the pressure of the fluid is as high as 175 MPa, when the fluid entering the valve body 5 impacts the bottom surface of the hanger body 1, the impact direction is as follows: Figure 4 As shown by the hollow arrow, the hanger body 1 will vibrate continuously in the valve body 5. Under long-term vibration, the sealing ring 3 between the hanger body 1 and the valve body 5 is damaged, which causes the fluid to leak from the sealing ring 3 to the outside, thereby shortening the service life of the casing head.

[0011] In addition, when the bottom surface of the hanger body 1 is impacted by the fluid, the hanger body 1 will also move upward. After a long period of movement, the hanger body 1 will break free from the restraint of the top screw 9 and fall out of the valve body 5. After falling out, the entire casing head cannot be used anymore, thereby further shortening the service life of the casing head.

[0012] Therefore, there is an urgent need for a casing head that can prevent the hanger body from vibrating and twitching and has a longer service life and a method for using the casing head. Summary of the invention

[0013] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a 175MPa anti-vibration durable casing head and a method of using the same which can prevent the hanger body from vibrating and tumbling and has a longer service life.

[0014] The purpose of the present invention is achieved by the following technical solutions: a 175MPa anti-vibration durable casing head, which includes a hanger body, a fixing assembly B for installing and fixing the hanger body, an upper annular plate, a sealing ring and a lower annular plate are sequentially sleeved on the hanger body from top to bottom, rectangular blocks are welded on the left and right sides of the upper end of the hanger body, through holes are opened in the two rectangular blocks, and fixing blocks are welded on the left and right sides of the lower end of the hanger body, and grooves are opened on the bottom surfaces of the two fixing blocks;

[0015] The fixing assembly B comprises a valve body, a step surface provided in the inner cavity of the valve body, two positioning posts respectively located on the left and right sides of the inner cavity are fixed on the top surface of the valve body, locking assemblies for preventing the hanger body from moving upward and for preventing the hanger body from vibrating are provided on both the left and right sides of the valve body, and tightening assemblies for preventing the hanger body from vibrating are also provided on both the left and right sides of the valve body, and the two tightening assemblies are respectively located directly below the two locking assemblies;

[0016] The locking assembly on the right side includes a first cylinder body fixedly arranged on the right side wall of the valve body, a first piston is slidably installed in the first cylinder body, the first piston divides the cavity of the first cylinder body into a left chamber and a right chamber, a first rod member is welded on the left end surface of the first piston and penetrates the first cylinder body to the left, a movable plate is fixedly arranged on the left end portion of the first rod member, a U-shaped clamping seat and a clamping block are fixedly arranged on the left end surface of the movable plate, and a U-shaped groove of the U-shaped clamping seat is arranged opposite to the positioning column on the left and right sides;

[0017] The tightening assembly on the right side includes a bracket fixed on the right side wall of the valve body, a second cylinder body fixed on the bracket, and a base welded on the right side wall of the inner cavity of the valve body. A vertically arranged pressure block is hinged on the top surface of the base, and a connecting rod is hinged on the right end surface of the pressure block via a pin I. A second piston is slidably installed in the second cylinder body, and the second piston divides the cavity of the second cylinder body into a left chamber and a right chamber. A second rod member is welded on the left end surface of the second piston, which sequentially passes through the left side wall of the second cylinder body, the bracket, and the right side wall of the valve body to the left, and the extended end of the second rod member is hinged to the right end of the connecting rod via a pin II;

[0018] The left and right side walls of the valve body are both provided with drainage channels located below the second rod, and a filter and a pressure reducing valve are connected in sequence to the outer port of the drainage channel located on the right side, and the other port of the pressure reducing valve is connected to the left chamber of the second cylinder body, and a pipe connected to its left chamber is connected to the top surface of the second cylinder body, and the other port of the pipe is connected to the right chamber of the first cylinder body.

[0019] The two locking components are symmetrically arranged with respect to the inner cavity of the valve body, and the two tightening components are symmetrically arranged with respect to the inner cavity of the valve body.

[0020] A mounting frame is fixedly arranged on the right side wall of the valve body, and the first cylinder body is fixedly arranged on the right end surface of the mounting frame.

[0021] The first rod is sleeved with a first spring, the left end of the first spring is fixed on the left side wall of the first cylinder body, and the right end of the first spring is fixed on the left end surface of the first piston.

[0022] The second rod is sleeved with a second spring, the left end of the second spring is fixed on the left side wall of the second cylinder body, and the right end of the second spring is fixed on the left end surface of the second piston.

[0023] The width of the U-shaped groove of the U-shaped holder is equal to the outer diameter of the positioning column.

[0024] A stop valve is fixedly arranged on the right side wall of the second cylinder body, and the stop valve is communicated with the right chamber of the second cylinder body.

[0025] The left and right side walls of the valve body are both connected with pressure regulating valves.

[0026] A method for using a 175MPa vibration-proof and durable casing head, comprising the following steps:

[0027] S1. Assemble the casing head. The specific operation steps are as follows:

[0028] S11, the worker inserts the two fixing blocks located at the lower end of the hanger body into the inner cavity of the valve body of the fixing assembly B from top to bottom;

[0029] S12, respectively sleeve the grooves of the two fixing blocks on the pressure blocks of the two tightening assemblies; then sleeve the through holes of the two rectangular blocks located at the upper end of the hanger body on the two positioning columns; then support the two rectangular blocks on the top surface of the valve body, and finally assemble the casing head; at this time, the lower annular plate of the hanger body is just supported on the step surface of the valve body, and the sealing ring is in the sealing position, and at the same time, the two rectangular blocks are respectively opposite to the holding blocks of the two locking assemblies on the left and right, and the two positioning columns are respectively opposite to the U-shaped grooves of the U-shaped holders of the two locking assemblies on the left and right;

[0030] S2. The worker fixes the bottom end of the valve body of the casing head on the top of the drilling equipment and ensures that the inner cavity of the valve body is connected to the drilling equipment;

[0031] S3. When the drilling operation is completed, the fluid I returned from the wellhead passes through the drilling equipment, the inner cavity of the valve body, and the hollow channel of the hanger body in sequence, and finally flows into the next-level pipeline to realize the transportation of the fluid I; wherein, the fluid I entering the inner cavity of the valve body will also enter the two drainage channels, and the fluid II entering the drainage channel passes through the drainage channel, the outer port of the drainage channel, the filter, and the pressure reducing valve in sequence, and then enters the left chamber of the second cylinder body of the tightening assembly, and the fluid II entering the left chamber of the second cylinder body pushes the second piston in the second cylinder body outward, and the second piston stretches the second spring outward, and at the same time, the second piston drives the second rod to pull the second rod outward, and the second rod pulls the connecting rod to move outward, and the connecting rod drives the pressure block to rotate outward relative to the base, and the pressure block is pressed on the outer wall of the groove of the fixed block, thereby tightening and fixing the fixed block outward, and the fixed block is fixedly connected to the hanger body, thereby tightening and fixing the lower end of the hanger body outward, and then tightening and fixing the lower end of the hanger body;

[0032] When the left chamber of the second cylinder is filled with fluid II, the fluid II in the left chamber of the second cylinder enters the right chamber of the first cylinder of the locking assembly through the pipeline, and the fluid II entering the right chamber of the first cylinder pushes the first piston in the first cylinder inwardly, and the first piston compresses the first spring inwardly, and the first piston drives the first rod to move inwardly, and the first rod drives the movable plate to move inward synchronously, and the movable plate drives the U-shaped clamping seat and the clamping block to move inward synchronously, and the U-shaped groove of the U-shaped clamping seat is clamped on the outside of the positioning column, and at the same time, the clamping block abuts against the outer surface of the rectangular block, and the rectangular block is fixedly connected to the hanger body, so that the upper end of the hanger body is locked and fixed;

[0033] S4. Workers can adjust the pressure of the fluid I returned from the wellhead by starting or closing the pressure regulating valve on the control valve body;

[0034] S5. After all the fluid I in the wellhead has been collected, the steps for recovering the casing head are as follows:

[0035] The liquid extraction port of the liquid extraction pump is connected to the external port of the stop valve, and the worker opens the stop valve and the liquid extraction pump. Under the pump pressure, the liquid extraction pump extracts the fluid II in the right chamber of the first cylinder, the fluid II in the pipeline, and the fluid II in the left chamber of the second cylinder to the outside. During the extraction process, under the action of the restoring force of the second spring, the second spring pushes the second piston to reset, thereby separating the pressure block from the fixed block. At the same time, under the action of the restoring force of the first spring, the first spring pushes the first piston to reset, thereby separating the U-shaped seat from the positioning column, and the clamping block from the rectangular block. After separation, the worker removes the hanger body from the valve body, thereby realizing the recovery of the casing head.

[0036] The invention has the following advantages: it can prevent the hanger body from vibrating and skewing, and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a hanger body of a casing head;

[0038] Figure 2 It is a structural schematic diagram of a fixing component A of a casing head;

[0039] Figure 3 is a schematic diagram of the structure of the assembled casing head;

[0040] Figure 4 is a working schematic diagram of the casing head;

[0041] Figure 5 It is a schematic diagram of the connection between the hanger body, the rectangular block and the fixing block of the present invention;

[0042] Figure 6 It is a structural schematic diagram of the fixing component B of the present invention;

[0043] Figure 7 for Figure 6 A partial enlarged view of the C part;

[0044] Figure 8 This is the axonometric view of the press block;

[0045] Fig. 9 It is a schematic diagram of the connection between the pressure block, the connecting rod, the base, the second rod and the second piston;

[0046] Fig.10 for Figure 6 A partial enlarged view of the D part;

[0047] Fig.11 This is the axonometric drawing of the U-shaped seat;

[0048] Fig.12It is a connection diagram of the U-shaped card seat, the clamping block, the movable plate, the first rod and the first piston;

[0049] Fig.13 for Fig.12 The main cross-sectional diagram of

[0050] Fig.14 A schematic diagram of inserting two fixing blocks located at the lower end of the hanger body into the inner cavity of the valve body from top to bottom;

[0051] Fig.15 It is a schematic diagram of the structure of the casing head finally assembled;

[0052] Fig.16 for Fig.15 A partial enlarged view of part E;

[0053] Fig.17 for Fig.15 A partial enlarged view of the F part;

[0054] Fig.18 The working diagram of the assembled casing head is shown in FIG.

[0055] Fig.19 A schematic diagram of a pressing block tightening and fixing the fixing block of the hanger body outward;

[0056] Fig. 20 for Fig.19 A partial enlarged view of the M part;

[0057] Fig.21 It is a schematic diagram of the U-shaped card holder being sleeved on the outside of the positioning column;

[0058] Fig. 22 for Fig.21 N partial enlarged diagram of the part;

[0059] In the figure:

[0060] 1- hanger body, 2- upper annular plate, 3- sealing ring, 4- lower annular plate, 5- valve body, 6- inner cavity, 7- step surface, 8- top screw cap, 9- top screw rod, 10- pressure regulating valve;

[0061] 11- rectangular block, 12- through hole, 13- fixed block, 14- groove;

[0062] 15-positioning column, 16-locking assembly, 17-tightening assembly, 18-first cylinder, 19-first piston, 20-first rod, 21-movable plate, 22-U-shaped seat, 23-holding block;

[0063] 24-second cylinder body, 25-base, 26-pressing block, 27-pin shaft I, 28-connecting rod, 29-second piston, 30-second rod, 31-pin shaft II;

[0064] 32 - drainage channel, 33 - pressure reducing valve, 34 - pipeline, 35 - first spring, 36 - second spring, 37 - stop valve. DETAILED DESCRIPTION

[0065] The present invention is further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited to the following:

[0066] like Figure 5~Figure 13 As shown, a 175MPa vibration-proof and durable casing head includes a hanger body 1, a fixing assembly B for installing and fixing the hanger body 1, an upper annular plate 2, a sealing ring 3 and a lower annular plate 4 are sequentially sleeved on the hanger body 1 from top to bottom, rectangular blocks 11 are welded on the left and right sides of the upper end of the hanger body 1, and through holes 12 are provided in the two rectangular blocks 11, and fixing blocks 13 are welded on the left and right sides of the lower end of the hanger body 1, and grooves 14 are provided on the bottom surfaces of the two fixing blocks 13.

[0067] The fixing component B includes a valve body 5 and a step surface 7 opened in the inner cavity 6 of the valve body 5. The left and right side walls of the valve body 5 are connected to a pressure regulating valve 10. Two positioning columns 15 are fixed on the top surface of the valve body 5 and are respectively located on the left and right sides of the inner cavity 6. The left and right sides of the valve body 5 are provided with locking components 16 for preventing the hanger body 1 from moving upward and for preventing the hanger body 1 from vibrating. The left and right sides of the valve body 5 are also provided with tightening components 17 for preventing the hanger body 1 from vibrating. The two tightening components 17 are respectively located directly below the two locking components 16; the two locking components 16 are symmetrically arranged with respect to the inner cavity 6 of the valve body 5, and the two tightening components 17 are symmetrically arranged with respect to the inner cavity 6 of the valve body 5.

[0068] The locking assembly 16 on the right side includes a first cylinder 18 fixedly mounted on the right side wall of the valve body 5, a mounting frame fixedly mounted on the right side wall of the valve body 5, and the first cylinder 18 fixedly mounted on the right end face of the mounting frame. A first piston 19 is slidably mounted in the first cylinder 18, and the first piston 19 divides the cavity of the first cylinder 18 into a left chamber and a right chamber. A first rod 20 is welded on the left end face of the first piston 19 and passes through the first cylinder 18 to the left. A movable plate 21 is fixedly mounted on the left end of the first rod 20, and a U-shaped holder 22 and a clamping block 23 are fixedly mounted on the left end face of the movable plate 21. The U-shaped groove of the U-shaped holder 22 is arranged opposite to the positioning column 15 on the left and right sides; the width of the U-shaped groove of the U-shaped holder 22 is equal to the outer diameter of the positioning column 15.

[0069] The tightening assembly 17 located on the right side includes a bracket fixed on the right side wall of the valve body 5, a second cylinder body 24 fixed on the bracket, and a base 25 welded on the right side wall of the inner cavity 6 of the valve body 5. A vertically arranged pressure block 26 is hinged on the top surface of the base 25, and a connecting rod 28 is hinged on the right end surface of the pressure block 26 via a pin I27. A second piston 29 is slidably installed in the second cylinder body 24. The second piston 29 divides the cavity of the second cylinder body 24 into a left chamber and a right chamber. A second rod member 30 is welded on the left end surface of the second piston 29, which passes through the left side wall of the second cylinder body 24, the bracket, and the right side wall of the valve body 5 in sequence to the left. The extended end of the second rod member 30 is hinged to the right end of the connecting rod 28 via the pin II31; a stop valve 37 is fixed on the right side wall of the second cylinder body 24, and the stop valve 37 is connected to the right chamber of the second cylinder body 24.

[0070] The left and right side walls of the valve body 5 are both provided with drainage channels 32 located below the second rod 30. The outer port of the drainage channel 32 located on the right side is connected with a filter and a pressure reducing valve 33 in sequence. The other port of the pressure reducing valve 33 is connected to the left chamber of the second cylinder 24. The top surface of the second cylinder 24 is connected with a pipe 34 connected to its left chamber, and the other port of the pipe 34 is connected to the right chamber of the first cylinder 18.

[0071] The first rod 20 is sleeved with a first spring 35, the left end of the first spring 35 is fixedly mounted on the left side wall of the first cylinder 18, and the right end of the first spring 35 is fixedly mounted on the left end surface of the first piston 19. The second rod 30 is sleeved with a second spring 36, the left end of the second spring 36 is fixedly mounted on the left side wall of the second cylinder 24, and the right end of the second spring 36 is fixedly mounted on the left end surface of the second piston 29.

[0072] A method for using a 175MPa vibration-proof and durable casing head, comprising the following steps:

[0073] S1. Assemble the casing head. The specific operation steps are as follows:

[0074] S11, the worker inserts the two fixing blocks 13 at the lower end of the hanger body 1 into the inner cavity 6 of the valve body 5 of the fixing assembly B from top to bottom, as shown in FIG. Fig.14 As shown;

[0075] S12, respectively sleeve the grooves 14 of the two fixing blocks 13 onto the pressing blocks 26 of the two tightening assemblies 17; then sleeve the through holes 12 of the two rectangular blocks 11 located at the upper end of the hanger body 1 onto the two positioning columns 15; then support the two rectangular blocks 11 on the top surface of the valve body 5, and finally assemble the casing head, as shown in FIG. Figure 15~Figure 17As shown; at this time, the lower annular plate 4 of the hanger body 1 is just supported on the step surface 7 of the valve body 5, and the sealing ring 3 is in the sealing position. At the same time, the two rectangular blocks 11 are respectively opposite to the holding blocks 23 of the two locking components 16, and the two positioning columns 15 are respectively opposite to the U-shaped grooves of the U-shaped seats 22 of the two locking components 16;

[0076] S2. The worker fixes the bottom end of the valve body 5 of the casing head on the top of the drilling equipment and ensures that the inner cavity 6 of the valve body 5 is connected to the drilling equipment;

[0077] S3. After the drilling operation is completed, the fluid I returned from the wellhead passes through the drilling equipment, the inner cavity 6 of the valve body 5, the hollow channel of the hanger body 1, and finally flows into the next-level pipeline to realize the transportation of the fluid I. The flow direction of the fluid I is as follows: Fig.18 As shown by the solid arrow in the middle; wherein, the fluid I entering the inner cavity of the valve body 5 will also enter the two drainage channels 32, and the fluid II entering the drainage channel 32 will sequentially pass through the drainage channel 32, the outer port of the drainage channel 32, the filter, and the pressure reducing valve 33, and then enter the left chamber of the second cylinder 24 of the tightening assembly 17, and the fluid II entering the left chamber of the second cylinder 24 pushes the second piston 29 in the second cylinder 24 outward, and the second piston 29 stretches the second spring 36 outward, and at the same time The second piston 29 drives the second rod 30 to pull the second rod 30 outward, and the second rod 30 pulls the connecting rod 28 to move outward. The connecting rod 28 drives the pressing block 26 to rotate outward relative to the base 25. The pressing block 26 presses on the outer side wall of the groove 14 of the fixing block 13, thereby tightening and fixing the fixing block 13 outward, and the fixing block 13 is fixedly connected to the hanger body 1 as a whole, thereby tightening and fixing the lower end of the hanger body 1 outward, and then tightening and fixing the lower end of the hanger body 1, as shown in FIG. Figure 19~Figure 20 As shown;

[0078] When the left chamber of the second cylinder 24 is filled with fluid II, the fluid II in the left chamber of the second cylinder 24 enters into the right chamber of the first cylinder 18 of the locking assembly 16 through the pipeline 34, and the fluid II entering into the right chamber of the first cylinder 18 pushes the first piston 19 in the first cylinder 18 inwardly, and the first piston 19 compresses the first spring 35 inwardly, and the first piston 19 drives the first rod 20 to move inwardly, and the first rod 20 drives the movable plate 21 to move inwardly synchronously, and the movable plate 21 drives the U-shaped seat 22 and the clamping block 23 to move inwardly synchronously, and the U-shaped groove of the U-shaped seat 22 is clamped on the outside of the positioning column 15, and at the same time, the clamping block 23 abuts against the outer surface of the rectangular block 11, and the rectangular block 11 is fixedly connected to the hanger body 1, so that the upper end of the hanger body 1 is locked and fixed, as shown in FIG. Figure 21-22 As shown;

[0079] S4, the worker can adjust the pressure of the fluid I returned from the wellhead by starting or closing the pressure regulating valve 10 on the control valve body 5;

[0080] S5. When all the fluid I in the wellhead has been collected, the operating steps for recovering the casing head are as follows: connect the suction port of the suction pump to the external port of the stop valve 37, and the worker opens the stop valve 37 and the suction pump. Under the pump pressure, the suction pump pumps the fluid II in the right chamber of the first cylinder 18, the fluid II in the pipeline 34, and the fluid II in the left chamber of the second cylinder 24 to the outside. During the pumping process, under the restoring force of the second spring 36, the second spring 36 pushes the second piston 29 to reset, thereby separating the pressure block 26 from the fixed block 13. At the same time, under the restoring force of the first spring 35, the first spring 35 pushes the first piston 19 to reset, thereby separating the U-shaped seat 22 from the positioning column 15, and the clamping block 23 from the rectangular block 11. After separation, the worker takes out the hanger body 1 from the valve body 5, thereby realizing the recovery of the casing head.

[0081] Among them, it can be known from step S3 that after the fluid II flowing out of the two drainage channels 32 respectively enters the left chambers of the second cylinder bodies 24 of the two tightening assemblies 17, under the pressure of the fluid II itself, the two fluid IIs respectively drive the two second pistons 29 to move outward synchronously, and the second pistons 29 drive the second rods 30 to move outward, and the second rods 30 pull the pressure block 26 to rotate outward, and the pressure block 26 tightens and fixes the fixing block 13 of the hanger body 1 outward, thereby achieving the tightening and fixing of the lower end of the hanger body 1;

[0082] At the same time, after the two fluids II enter the right chambers of the two first cylinders 18 of the two locking assemblies 16 respectively through the pipeline 34, the two fluids II enter the right chambers of the locking assemblies 16 respectively, and under the pressure of the fluid II itself, the two fluids II respectively drive the two first pistons 19 to move inward synchronously, and the first piston 19 drives the first rod 20 to move inward, and the first rod 20 drives the U-shaped seat 22 and the clamping block 23 to move synchronously, and the clamping block 23 clamps the rectangular block 11 of the hanger body 1, and at the same time, the U-shaped seat 22 is clamped on the outside of the positioning column 15, thereby achieving the locking and fixing of the upper end of the hanger body 1.

[0083] It can be seen that the lower end of the hanger body 1 is fixed by the two tightening assemblies 17, and at the same time, the upper end of the hanger body 1 is locked and fixed by the two locking assemblies 16, so that the hanger body 1 is firmly fixed in the valve body 5. Therefore, when the fluid I entering the valve body 5 impacts the bottom surface of the hanger body 1, the hanger body 1 will not vibrate in the valve body 5, which plays a good role in protecting the sealing ring 3, thereby preventing the fluid I from leaking from the sealing ring 3 to the outside. Therefore, compared with the above-mentioned Figure 1~Figure 4 The casing head shown has a longer service life.

[0084] In addition, the U-shaped seats 22 of the two locking assemblies 16 are respectively clamped on the outside of the two positioning columns 15 and are blocked directly above the two rectangular blocks 11. Therefore, when the bottom surface of the hanger body 1 is impacted by the fluid I, the hanger body 1 is effectively prevented from moving upward and coming out of the valve body 5, ensuring that the casing head can be used for a long time. Therefore, compared with the casing head of Figure 1~Figure 4 The casing head shown has a longer service life.

Claims

1. A 175MPa shockproof and durable casing head, characterized by: It comprises a hanger body (1), a fixing assembly B for installing and fixing the hanger body (1), an upper annular plate (2), a sealing ring (3) and a lower annular plate (4) being sequentially sleeved on the hanger body (1) from top to bottom, rectangular blocks (11) being welded on the left and right sides of the upper end of the hanger body (1), through holes (12) being provided in the two rectangular blocks (11), and fixing blocks (13) being welded on the left and right sides of the lower end of the hanger body (1), and grooves (14) being provided on the bottom surfaces of the two fixing blocks (13); The fixing assembly B comprises a valve body (5), a step surface (7) formed in an inner cavity (6) of the valve body (5), two positioning columns (15) respectively located on the left and right sides of the inner cavity (6), and locking assemblies (16) for preventing the hanger body (1) from moving upward and for preventing the hanger body (1) from vibrating are arranged on the left and right sides of the valve body (5). The left and right sides of the valve body (5) are also provided with tightening assemblies (17) for preventing the hanger body (1) from vibrating. The two tightening assemblies (17) are respectively located directly below the two locking assemblies (16); The locking assembly (16) located on the right side comprises a first cylinder (18) fixedly mounted on the right side wall of the valve body (5), a first piston (19) being slidably mounted in the first cylinder (18), the first piston (19) dividing the cavity of the first cylinder (18) into a left cavity and a right cavity, a first rod (20) being welded on the left end surface of the first piston (19) and penetrating the first cylinder (18) to the left, a movable plate (21) being fixedly mounted on the left end portion of the first rod (20), a U-shaped holder (22) and a clamping block (23) being fixedly mounted on the left end surface of the movable plate (21), the U-shaped groove of the U-shaped holder (22) being arranged opposite to the positioning column (15) on the left and right sides; The tightening assembly (17) located on the right side comprises a bracket fixed on the right side wall of the valve body (5), a second cylinder body (24) fixed on the bracket, and a base (25) welded to the right side wall of the inner cavity (6) of the valve body (5); a vertically arranged pressure block (26) is hinged on the top surface of the base (25); a connecting rod (28) is hinged on the right end surface of the pressure block (26) via a pin I (27); a second piston (29) is slidably mounted in the second cylinder body (24); the second piston (29) divides the cavity of the second cylinder body (24) into a left chamber and a right chamber; a second rod (30) is welded on the left end surface of the second piston (29) and passes through the left side wall of the second cylinder body (24), the bracket, and the right side wall of the valve body (5) in sequence to the left; an extended end of the second rod (30) is hinged to the right end of the connecting rod (28) via a pin II (31); The left and right side walls of the valve body (5) are each provided with a drainage channel (32) located below the second rod (30); a filter and a pressure reducing valve (33) are sequentially connected to the outer port of the drainage channel (32) on the right side; the other port of the pressure reducing valve (33) is connected to the left chamber of the second cylinder (24); a pipe (34) connected to the left chamber of the second cylinder (24) is connected to the top surface of the second cylinder (24); the other port of the pipe (34) is connected to the right chamber of the first cylinder (18).

2. A 175MPa shockproof and durable casing head according to claim 1, characterized in that: The two locking assemblies (16) are symmetrically arranged with respect to the inner cavity (6) of the valve body (5), and the two tightening assemblies (17) are symmetrically arranged with respect to the inner cavity (6) of the valve body (5).

3. A 175MPa shockproof and durable casing head according to claim 2, characterized in that: A mounting frame is fixedly arranged on the right side wall of the valve body (5), and the first cylinder body (18) is fixedly arranged on the right end surface of the mounting frame.

4. A 175MPa shockproof and durable casing head according to claim 3, characterized in that: A first spring (35) is sleeved on the first rod (20), the left end of the first spring (35) is fixedly mounted on the left side wall of the first cylinder body (18), and the right end of the first spring (35) is fixedly mounted on the left end surface of the first piston (19).

5. A 175MPa shockproof and durable casing head according to claim 4, characterized in that: A second spring (36) is sleeved on the second rod (30), the left end of the second spring (36) is fixedly mounted on the left side wall of the second cylinder body (24), and the right end of the second spring (36) is fixedly mounted on the left end surface of the second piston (29).

6. A 175MPa shockproof and durable casing head according to claim 5, characterized in that: The width of the U-shaped groove of the U-shaped holder (22) is equal to the outer diameter of the positioning column (15).

7. A 175MPa shockproof and durable casing head according to claim 6, characterized in that: A stop valve (37) is fixedly provided on the right side wall of the second cylinder body (24), and the stop valve (37) is communicated with the right chamber of the second cylinder body (24).

8. The 175MPa shock-proof and durable casing head according to claim 7, characterized in that: The left and right side walls of the valve body (5) are both connected to a pressure regulating valve (10).

9. A method for using a 175 MPa vibration-proof durable casing head, using the 175 MPa vibration-proof durable casing head according to claim 8, characterized in that: It includes the following steps: S1. Assemble the casing head. The specific operation steps are as follows: S11, a worker inserts two fixing blocks (13) located at the lower end of the hanger body (1) into the inner cavity (6) of the valve body (5) of the fixing assembly B from top to bottom; S12, respectively sleeve the grooves (14) of the two fixing blocks (13) onto the pressing blocks (26) of the two tightening assemblies (17); then sleeve the through holes (12) of the two rectangular blocks (11) located at the upper end of the hanger body (1) onto the two positioning columns (15); then support the two rectangular blocks (11) on the top surface of the valve body (5), and finally assemble the casing head; at this time, the lower annular plate (4) of the hanger body (1) is just supported on the step surface (7) of the valve body (5), and the sealing ring (3) is in the sealing position, and at the same time, the two rectangular blocks (11) are respectively opposite to the holding blocks (23) of the two locking assemblies (16) on the left and right, and the two positioning columns (15) are respectively opposite to the U-shaped grooves of the U-shaped holders (22) of the two locking assemblies (16) on the left and right; S2. A worker fixes the bottom end of the valve body (5) of the casing head on the top of the drilling equipment and ensures that the inner cavity (6) of the valve body (5) is connected to the drilling equipment; S3. When the drilling operation is completed, the fluid I returned from the wellhead passes through the drilling equipment, the inner cavity (6) of the valve body (5), and the hollow channel of the hanger body (1) in sequence, and finally flows into the next-level pipeline to realize the transportation of the fluid I; wherein, the fluid I entering the inner cavity of the valve body (5) will also enter the two drainage channels (32), and the fluid II entering the drainage channel (32) will pass through the drainage channel (32), the outer port of the drainage channel (32), the filter, the pressure reducing valve (33) and then enter the left chamber of the second cylinder (24) of the tightening assembly (17), and the fluid II entering the left chamber of the second cylinder (24) pushes the inner cavity of the second cylinder (24) outward. The second piston (29) is moved, the second piston (29) stretches the second spring (36) outward, and at the same time, the second piston (29) drives the second rod (30) to pull the second rod (30) outward, the second rod (30) pulls the connecting rod (28) to move outward, the connecting rod (28) drives the pressure block (26) to rotate outward relative to the base (25), the pressure block (26) is pressed on the outer side wall of the groove (14) of the fixed block (13), and the fixed block (13) is tightened and fixed outward, and the fixed block (13) is fixedly connected to the hanger body (1), so that the lower end of the hanger body (1) is tightened and fixed outward, and the lower end of the hanger body (1) is tightened and fixed; When the left chamber of the second cylinder (24) is filled with fluid II, the fluid II in the left chamber of the second cylinder (24) enters the right chamber of the first cylinder (18) of the locking assembly (16) through the pipe (34). The fluid II that has entered the right chamber of the first cylinder (18) pushes the first piston (19) in the first cylinder (18) inwardly. The first piston (19) compresses the first spring (35) inwardly. The first piston (19) drives the first rod (20) inwardly. The first rod (20) drives the movable plate (21) to move inward synchronously, and the movable plate (21) drives the U-shaped clamping seat (22) and the clamping block (23) to move inward synchronously, and the U-shaped groove of the U-shaped clamping seat (22) is clamped on the outside of the positioning column (15). At the same time, the clamping block (23) abuts against the outer surface of the rectangular block (11), and the rectangular block (11) is fixedly connected to the hanger body (1), so that the upper end of the hanger body (1) is locked and fixed; S4. The worker can adjust the pressure of the fluid I returned from the wellhead by starting or closing the pressure regulating valve (10) on the control valve body (5); S5. After all the fluid I in the wellhead has been collected, the steps for recovering the casing head are as follows: The liquid extraction port of the liquid extraction pump is connected to the external port of the stop valve (37). The worker opens the stop valve (37) and the liquid extraction pump. Under the pump pressure, the liquid extraction pump extracts the fluid II in the right chamber of the first cylinder (18), the fluid II in the pipeline (34), and the fluid II in the left chamber of the second cylinder (24) to the outside. During the extraction process, under the action of the restoring force of the second spring (36), the second spring (36) pushes the second piston (29) to reset, thereby separating the pressure block (26) from the fixed block (13). At the same time, under the action of the restoring force of the first spring (35), the first spring (35) pushes the first piston (19) to reset, thereby separating the U-shaped seat (22) from the positioning column (15), and the clamping block (23) from the rectangular block (11). After separation, the worker removes the hanger body (1) from the valve body (5), thereby realizing the recovery of the casing head.

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