Negative pressure flushing device for oil fishing wellhead

Abstract

The utility model discloses an oil bailing wellhead negative pressure flushing device which comprises a flushing assembly, the flushing assembly comprises a short circuit main body, the short circuit main body comprises a tank-shaped negative pressure tank, the upper portion of the negative pressure tank is provided with a tubular upper connecting pipe, the outer wall of the tail end of the upper connecting pipe is provided with a plurality of sealing grooves, and the sealing grooves are communicated with the negative pressure tank. A through lower connecting pipe is arranged on the lower portion of the negative pressure tank, a bottom screw thread is arranged on the outer wall of the tail end of the lower connecting pipe, a main injection port and a plurality of auxiliary injection ports are formed in the side wall of the negative pressure tank, a main injection unit is arranged on the main injection port, an auxiliary injection unit is arranged on each auxiliary injection port, and the main injection unit and the auxiliary injection units are communicated with each other. And the main injection unit is communicated with the auxiliary injection unit through a high-pressure hose. According to the utility model, the principle of negative pressure channel and nozzle flushing is utilized to replace the conventional flushing by using a paraffin remover or diesel oil, so that the material consumption is reduced, the labor intensity is reduced, and the environmental sanitation of a wellhead is protected.

Description

Technical Field

[0001] The utility model relates to oil production equipment, more specifically, to a negative pressure flushing device for an oil wellhead. Background Art

[0002] Currently, if Figure 8 As shown, the existing short-circuit main body 800 is a straight-cylinder type. During oil recovery operations, when the wire rope is raised to the wellhead, the crude oil from the upper part of the oil pump rubber to the wire rope cap cannot enter the tank truck or be lowered into the well. When the wire rope is further raised, this part of the crude oil overflows from the wellbore and falls to the ground, requiring manual recovery of the crude oil and cleaning of the wellhead. When the oil pump rubber is raised from the wellbore, a large amount of crude oil is adsorbed on the weighted rod, which also requires manual cleaning and recovery of the oil. This labor-intensive process requires large amounts of diesel or paraffin remover for flushing, which is costly and easily causes environmental pollution. Utility Model Content

[0003] Based on this, it is necessary to provide a negative pressure flushing device for oil wellhead in response to the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A negative pressure flushing device for an oil wellhead is characterized in that the negative pressure flushing device for an oil wellhead comprises a flushing assembly, the flushing assembly comprises a short-circuit main body, the short-circuit main body comprises a can-shaped negative pressure tank, the upper part of the negative pressure tank is provided with a tubular upper connecting pipe, the outer wall of the end of the upper connecting pipe is provided with a plurality of sealing grooves, the lower part of the negative pressure tank is provided with a penetrating lower connecting pipe, the outer wall of the end of the lower connecting pipe is provided with a bottom thread,

[0006] The side wall of the negative pressure tank is provided with a main injection port and several auxiliary injection ports. The main injection port is provided with a main injection unit, and the auxiliary injection ports are each provided with an auxiliary injection unit. The main injection unit and the auxiliary injection unit are connected through a high-pressure hose.

[0007] The main injection unit includes a quick connector, a four-way valve, a main check valve and a main nozzle.

[0008] The auxiliary injection unit comprises a three-way valve, a check valve and a nozzle.

[0009] As a preferred embodiment of the present invention, the quick connector is connected to an external high-pressure water source.

[0010] As a preferred embodiment of the present invention, a pair of handles are provided on the outer wall of the upper connecting pipe.

[0011] As a preferred embodiment of the present invention, four pairs of fixing pin seats are provided on the outer wall of the connecting pipe, and the fixing pin seats are provided with fixing pin holes passing through.

[0012] As a preferred embodiment of the present invention, the oil wellhead negative pressure flushing device also includes a water source component, the water source component includes a vehicle-mounted water pump and a vehicle-mounted water tank, the vehicle-mounted water tank is connected to the vehicle-mounted water pump through a water suction hose, and a water outlet hose is provided on the output port of the vehicle-mounted water pump, and the water outlet hose is connected to the quick connector.

[0013] As a preferred embodiment of the present invention, the vehicle-mounted water pump is connected to a control circuit.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The utility model provides a negative pressure flushing device for an oil wellhead. In the process of lifting the oil pump and the weighted rod, the power switch and start and stop of the onboard water pump can be controlled in the operating room. The outlet of the onboard water pump is connected to the flushing short circuit through a high-pressure hose and a quick connector. The clean water in the onboard water tank is passed through the nozzle inside the short circuit to flush the oil pump and the weighted rod. When the oil pump rubber is lifted to the negative pressure area, the crude oil on the top of the oil pump and the clean water for flushing are sucked into the wellbore. When the oil pump and the weighted rod are further lifted out of the wellhead, the nozzle will flush them from top to bottom. The utility model utilizes the principle of negative pressure channel and nozzle flushing, replacing the previous flushing method using paraffin remover or diesel, reducing material consumption, while reducing labor intensity and protecting the wellhead environment and hygiene. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the flushing assembly of the oil wellhead negative pressure flushing device of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of a partial three-dimensional structure of a flushing assembly of a negative pressure flushing device for an oil wellhead;

[0019] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure of the flushing component;

[0020] Figure 4for Figure 3 A schematic diagram of the exploded three-dimensional structure of the main injection unit A1 of the flushing assembly;

[0021] Figure 5 for Figure 3 A schematic diagram of the exploded three-dimensional structure of the auxiliary injection unit A2 of the flushing assembly;

[0022] Figure 6 This is a structural diagram of the water source assembly of the oil wellhead negative pressure flushing device of the present invention;

[0023] Figure 7 This is a schematic diagram of the use of the negative pressure flushing device for oil wellhead of the utility model;

[0024] Figure 8 It is a structural diagram of an existing short-circuit main body;

[0025] The markings in the figure are as follows: 1. Fixing pin hole; 10. Bottom thread; 11. Tee; 12. On-board water pump; 13. Water outlet hose; 14. On-board water tank; 15. Water suction hose; 16. Control circuit; 1S, Fixing pin seat; 2. Sealing groove; 3. Handle; 4. Quick connector; 5. High-pressure hose; 6. Main nozzle; 6A, auxiliary nozzle; 7. Main check valve; 7A, auxiliary check valve; 8. Short-circuit body; 80, Negative pressure tank; 801, Main injection port; 802, Auxiliary injection port; 81, Upper connecting pipe; 82, Lower connecting pipe; 9, Four-way; A1, Main injection unit; A2, Auxiliary injection unit; M1, Flushing assembly; M2, Water source assembly. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0027] like Figures 1 to 5 As shown, the oil wellhead negative pressure flushing device includes a flushing assembly M1, which includes a short-circuit body 8. The short-circuit body 8 includes a can-shaped negative pressure tank 80. The upper part of the negative pressure tank 80 is provided with a tubular upper connecting pipe 81, and the outer wall of the end of the upper connecting pipe 81 is provided with a plurality of sealing grooves 2. The lower part of the negative pressure tank 80 is provided with a penetrating lower connecting pipe 82, and the outer wall of the end of the lower connecting pipe 82 is provided with a bottom thread 10.

[0028] A main injection port 801 and several auxiliary injection ports 802 are provided on the side wall of the negative pressure tank 80. The main injection port 801 is provided with a main injection unit A1, and each auxiliary injection port 802 is provided with an auxiliary injection unit A2. The main injection unit A1 and the auxiliary injection unit A2 are connected through a high-pressure hose 5.

[0029] A pair of handles 3 are provided on the outer wall of the upper connecting tube 81. Four pairs of fixing pin seats 1S are provided on the outer wall of the connecting tube 81, and fixing pin holes 1 are provided through the fixing pin seats 1S.

[0030] The main injection unit A1 includes a quick connector 4 , a four-way valve 9 , a main check valve 7 and a main nozzle 6 .

[0031] The auxiliary injection unit A2 includes a three-way port 11, a secondary check valve 7A and a secondary nozzle 6A.

[0032] It should be noted that the main nozzle 6 and the auxiliary nozzle 6A adopt fan-shaped nozzles with a 60-degree angle.

[0033] The quick connector 4 is connected to an external high-pressure water source.

[0034] like Figure 6 As shown, the oil wellhead negative pressure flushing device also includes a water source component M2, which includes a vehicle-mounted water pump 12 and a vehicle-mounted water tank 14. The vehicle-mounted water tank 14 is connected to the vehicle-mounted water pump 12 through a water suction hose 15. A water outlet hose 13 is provided on the output port of the vehicle-mounted water pump 12, and the water outlet hose 13 is connected to the quick connector 4.

[0035] The vehicle-mounted water pump 12 is connected to a control circuit 16 for controlling the water pressure and water speed of the vehicle-mounted water pump 12. The control circuit 12 can be connected to the instrument panel in the vehicle operating room, including a power button, a power indicator light, a start / stop button, and a start / stop indicator light.

[0036] The working mode of the negative pressure flushing device for salvaging the oil wellhead will be described below.

[0037] like Figure 7 As shown, when in use, the bottom thread 10 of the short-circuit main body 8 is screwed into the sleeve coupling and tightened. The liquid outlet tee 21 is sleeved on the upper part of the short-circuit main body 8 and sealed by the sealing ring on the sealing groove 2 to prevent leakage.

[0038] Then, insert the fixing pin 22 of the liquid outlet tee 21 into the corresponding fixing pin hole 1 and fix it with a plug to prevent it from falling off during the lifting process.

[0039] Then, the liquid outlet high pressure hose 17 and the oil outlet joint 18 are fixed and tightened.

[0040] Then, the hydraulic packing box 19 is installed and tightened in the clockwise direction, the hydraulic hose 20 is connected, and the wire rope below is started to detect the liquid surface and salvage the oil.

[0041] When the oil pumping level approaches the wellhead, the speed is slowed down. After the liquid is discharged, the crude oil flows upward from the casing through the short-circuit body 8 to the liquid outlet tee 21, and enters the tank truck through the liquid outlet high-pressure hose 17.

[0042] When the oil pumping rubber in the well approaches the area of ​​the short-circuit main body 8, it is slowly lifted up. When the oil pumping rubber reaches the short-circuit main body 8, the strong negative pressure in the casing causes the crude oil in the upper part of the oil pumping rubber to be sucked back into the casing in the opposite direction to the liquid outlet tee 21 and the liquid outlet high-pressure hose 17. Most of the crude oil in the liquid outlet high-pressure hose 17 and the short-circuit main body 8 has flowed back into the casing, leaving only a small amount of residual oil adsorbed on the surface of the oil pumping rubber and the weighted rod.

[0043] During cleaning, the water outlet hose 13 of the water source assembly M2 is connected to the quick connector 4 of the flushing assembly M1.

[0044] Turn on the switch power supply of the control circuit 16 of the vehicle-mounted water pump 12 to start the vehicle-mounted water pump 12. At this time, the clean water in the vehicle-mounted water tank 14 flows into the vehicle-mounted water pump 12 through the water suction hose 15, directly enters the main injection unit A1 through the water outlet hose 13, and enters the auxiliary injection unit A2 through the high-pressure hose 5.

[0045] The inner wall of the negative pressure tank 80 is flushed using the main nozzle 6 on the main injection unit A1 and the auxiliary nozzle 6A on the auxiliary injection unit A2. The clean water is sprayed from four directions at 90-degree intervals toward the center. During the spraying process, the wire rope is slowly lifted, flushing the rope cap, oil pumping rubber, and weighted rod from top to bottom, thereby flushing any crude oil adsorbed on the surface into the casing.

[0046] After the flushing is completed, the oil pumping weighted rod is lifted up, the quick connector 4 is separated from the water outlet hose 13, the water outlet hose 13 is recovered, and the flushing assembly M1 is recovered into the vehicle tool box.

[0047] It should be noted that the function of the main check valve 7 and the auxiliary check valve 7A is to prevent the liquid from flowing back during the discharge and ensure that all the liquid flows to the liquid outlet tee 21 .

[0048] The negative pressure flushing device for oil wellheads can control the power switch and start and stop of the onboard water pump in the operation room during the process of lifting the oil pump and weighted rod. The outlet of the onboard water pump is connected to the flushing short circuit through a high-pressure hose and a quick connector. Clean water in the onboard water tank is passed through the nozzle inside the short circuit to flush the oil pump and weighted rod. When the oil pump rubber is lifted to the negative pressure area, the crude oil on the top of the oil pump and the clean water for flushing are sucked into the wellbore. When the oil pump and weighted rod are further lifted out of the wellhead, the nozzle will flush them from top to bottom. The utility model utilizes the principle of negative pressure channel and nozzle flushing, replacing the previous flushing method using paraffin remover or diesel, reducing material consumption, while reducing labor intensity and protecting the wellhead environment and hygiene.

[0049] Without limitation to this, any changes or substitutions that are not conceived through creative work should be included in the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be based on the scope of protection defined in the claims.

Claims

1. A negative pressure flushing device for oil wellhead, characterized in that: The oil wellhead negative pressure flushing device comprises a flushing assembly (M1), the flushing assembly (M1) comprises a short-circuit main body (8), the short-circuit main body (8) comprises a can-shaped negative pressure tank (80), the upper part of the negative pressure tank (80) is provided with a tubular upper connecting pipe (81), the end outer wall of the upper connecting pipe (81) is provided with a plurality of sealing grooves (2), the lower part of the negative pressure tank (80) is provided with a through lower connecting pipe (82), the end outer wall of the lower connecting pipe (82) is provided with a bottom thread (10), A main injection port (801) and a plurality of auxiliary injection ports (802) are provided on the side wall of the negative pressure tank (80), the main injection port (801) is provided with a main injection unit (A1), and each of the auxiliary injection ports (802) is provided with an auxiliary injection unit (A2), and the main injection unit (A1) and the auxiliary injection unit (A2) are connected via a high-pressure hose (5).

2. The negative pressure flushing device for oil wellhead according to claim 1, characterized in that: The main injection unit (A1) comprises a quick connector (4), a four-way valve (9), a main check valve (7) and a main nozzle (6). The auxiliary injection unit (A2) comprises a three-way valve (11), a check valve (7A) and a nozzle (6A).

3. The negative pressure flushing device for oil wellhead according to claim 1, characterized in that: The quick connector (4) is connected to an external high-pressure water source.

4. The negative pressure flushing device for oil wellhead according to claim 1, characterized in that: A pair of handles (3) are provided on the outer wall of the upper connecting tube (81).

5. The negative pressure flushing device for oil wellhead according to claim 1, characterized in that: Four pairs of fixing pin seats (1S) are provided on the outer wall of the connecting pipe (81), and the fixing pin seats (1S) are provided with fixing pin holes (1) passing through.

6. The negative pressure flushing device for oil wellhead according to claim 1, characterized in that: The oil wellhead negative pressure flushing device further comprises a water source component (M2), the water source component (M2) comprises a vehicle-mounted water pump (12) and a vehicle-mounted water tank (14), the vehicle-mounted water tank (14) is connected to the vehicle-mounted water pump (12) via a water suction hose (15), and a water outlet hose (13) is provided on the output port of the vehicle-mounted water pump (12), and the water outlet hose (13) is connected to the quick connector (4).

7. The negative pressure flushing device for oil wellhead according to claim 6, characterized in that: The vehicle-mounted water pump (12) is connected to a control circuit (16).

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