Online anti-freezing pressure tapping device

Abstract

The utility model discloses an on-line anti-freezing pressure tapping device, and relates to the technical field of oil exploitation. A section of vertical pipe is arranged on the upper portion of the pressure tapping pipe, a step hole with the diameter reduced is machined in the bottom of an inner hole of the vertical pipe and communicated with the inner hole of the pressure tapping pipe, the upper portion of the vertical pipe is connected with a gland in a sealed mode, and the piston is connected with the vertical pipe in a clearance fit mode through a sealing ring. The switch lever is in clearance fit connection with the center hole of the gland through a sealing ring, the top of the switch lever extends out of the gland, and the bottom of the switch lever abuts against the upper end face of the piston. The utility model has the beneficial effects that the piston and the switch lever are arranged, so that the upper space of the vertical pipe can be connected or disconnected with the pressure in the pipe, when a pressure instrument is installed, the pressure between the vertical pipe and the pressure tapping pipe is cut off, and when the pressure is tapped, a pressure channel between the vertical pipe and the pressure tapping pipe is opened, the operation is safe, and the data is accurate; meanwhile, the anti-freezing effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to an online antifreeze pressure tap. Background Technology

[0002] During oil extraction, it is necessary to monitor the pressure inside the tubing and the casing to determine the operating status of the oil well. Currently, pressure gauges and pressure sensors are installed on the wellhead to monitor the oil pressure and casing pressure respectively. Since the wellhead is located at the top of the oil well, and the pressure gauge connector is located above the tubing, gas tends to accumulate here, leading to inaccurate pressure monitoring values. The pressure gauge connector is generally DN15 or DN20 in diameter, which is small and prone to freezing in winter. Utility Model Content

[0003] To address the problems of inaccurate readings and freezing during winter monitoring of oil pressure and sleeve pressure, this invention provides an online anti-freeze pressure tap.

[0004] The technical solution provided by this utility model is: an online anti-freeze pressure tapping device, including a pressure tapping tube, with clamp flanges at both ends of the pressure tapping tube, a section of vertical pipe at the upper part of the pressure tapping tube, a stepped hole with a reduced diameter machined at the bottom of the inner hole of the vertical pipe, the stepped hole communicating with the inner hole of the pressure tapping tube, a pressure cap connected to the upper part of the vertical pipe by threads and a sealing ring, a piston inside the vertical pipe, the piston being connected to the vertical pipe by a clearance fit through the sealing ring, a central hole opened at the center of the pressure cap, a switch rod being connected to the central hole of the pressure cap by threads, the switch rod being connected to the central hole of the pressure cap by a clearance fit through the sealing ring, the top of the switch rod extending out of the pressure cap, and the bottom of the switch rod abutting against the upper end face of the piston;

[0005] The pressure cap has a pressure tap hole that runs vertically through it. The top of the pressure tap hole is machined with a thread for connecting a pressure gauge. The space above the piston, extending all the way into the pressure tap hole, is filled with antifreeze hydraulic oil.

[0006] The piston extends downwards from the stepped hole position by a stepped shaft, which is clearance-fitted with the stepped hole, and the bottom surface of the stepped shaft is flush with the inner hole of the pressure tapping tube.

[0007] The bottom of the pressure cap has a conical hole, the lower end of which starts from the inner wall of the riser and the upper end of which ends at the pressure tapping hole.

[0008] The beneficial effects of this utility model are as follows: by setting a piston and a switch rod, the upper space of the riser can be connected or disconnected from the pressure in the pressure tapping pipe. When installing a pressure gauge, the pressure between the riser and the pressure tapping pipe is cut off. When taking pressure, the pressure channel between the riser and the pressure tapping pipe is opened. The operation is safe, the data is accurate, and it also has an antifreeze effect. Attached Figure Description

[0009] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Appendix Figure 2 This is a schematic diagram of the pressure tapping tube in this utility model;

[0011] Appendix Figure 3 This is a schematic diagram of the piston structure in this utility model;

[0012] Appendix Figure 4 This is a schematic diagram of the pressure cap structure in this utility model.

[0013] In the diagram, 1-pressure tapping tube, 2-riseer tube, 3-piston, 4-pressure cap, 5-switch rod, 6-pressure tapping hole, 7-stepped hole, 8-stepped shaft, 9-conical hole, 10-center hole. Detailed Implementation

[0014] like Figures 1-4 As shown, an online antifreeze pressure tapping device includes a pressure tapping pipe 1 with clamp flanges at both ends. A section of riser 2 is provided at the upper part of the pressure tapping pipe 1. A stepped hole 7 with a reduced diameter is machined at the bottom of the inner hole of the riser 2, which communicates with the inner hole of the pressure tapping pipe 1. A pressure cap 4 is connected to the upper part of the riser 2 by threads and a sealing ring. A piston 3 is provided inside the riser 2, which is connected to the riser 2 by a clearance fit through a sealing ring. A central hole 10 is opened at the center of the pressure cap 4. A switch rod 5 is connected to the central hole 10 of the pressure cap 4 by threads. The switch rod 5 is connected to the central hole 10 of the pressure cap 4 by a clearance fit through a sealing ring. The top of the switch rod 5 extends out of the pressure cap 4, and the bottom of the switch rod 5 abuts against the upper end face of the piston 3.

[0015] The pressure cap 4 has a pressure tapping hole 6 that runs vertically through it. The top of the pressure tapping hole 6 is machined with threads for connecting a pressure gauge. The space above the piston 3, extending up to the pressure tapping hole 6, is filled with antifreeze hydraulic oil so that it will not freeze in winter.

[0016] The pressure tapping tube 1 is installed in series on the oil pipe or casing. When no pressure is being tapped, the switch rod 5 is tightened to press down the piston 3. At this time, the antifreeze hydraulic oil in the riser 2 is at normal pressure. When tapping pressure, the pressure gauge is connected to the pressure tapping hole 6, and then the switch rod 5 is loosened to allow the piston 3 to be in a free state. The pressure in the oil pipe or casing is transmitted to the pressure gauge through the piston 3 and the antifreeze hydraulic oil. The pressure tapping data is accurate and the operation is safe.

[0017] By setting piston 3 and switch rod 5, the upper space of riser 2 can be connected or disconnected from the pressure in pressure tapping pipe 1. When installing pressure gauge, the pressure between riser 2 and pressure tapping pipe 1 is disconnected. When taking pressure, the pressure channel between riser 2 and pressure tapping pipe 1 is opened. The operation is safe, the data is accurate, and it also has an antifreeze effect.

[0018] The piston 3 extends downwards at the stepped hole 7 with a stepped shaft 8. The stepped shaft 8 is clearance-fitted with the stepped hole 7. The bottom surface of the stepped shaft 8 is flush with the inner hole of the pressure tapping tube 1, which means that there will be no gas accumulation at the bottom of the piston 3, thus improving the accuracy of monitoring.

[0019] The bottom of the pressure cap 4 has a conical hole 9. The lower end of the conical hole 9 starts from the inner wall of the riser 2 and the upper end of the conical hole 9 ends at the pressure tapping hole 6. When antifreeze hydraulic oil is injected into the riser 2, the air in the riser 2 flows out from the conical hole 9 and the pressure tapping hole 6. No air is left in the space above the piston 3, so as to prevent the presence of air bubbles from affecting the accuracy of pressure monitoring.

Claims

1. An online antifreeze pressure tapping device, comprising a pressure tapping tube (1), characterized in that: The pressure tapping pipe (1) is equipped with clamp flanges at both ends. A section of riser pipe (2) is provided at the top of the pressure tapping pipe (1). A stepped hole (7) with a reduced diameter is machined at the bottom of the inner hole of the riser pipe (2). The stepped hole (7) is connected to the inner hole of the pressure tapping pipe (1). The upper part of the riser pipe (2) is connected to the pressure cap (4) by threads and sealing rings. A piston (3) is provided inside the riser pipe (2). The piston (3) is connected to the riser pipe (2) by a clearance fit through a sealing ring. A center hole (10) is opened in the center of the pressure cap (4). The center hole (10) of the pressure cap (4) is connected to the switch rod (5) by threads. The switch rod (5) is connected to the center hole (10) of the pressure cap (4) by a clearance fit through a sealing ring. The top of the switch rod (5) extends out of the pressure cap (4), and the bottom of the switch rod (5) rests on the upper end face of the piston (3). The pressure cap (4) has a pressure tapping hole (6) that runs vertically through it. The top of the pressure tapping hole (6) is machined with a thread for connecting a pressure gauge. The space above the piston (3) up to the pressure tapping hole (6) is filled with antifreeze hydraulic oil.

2. The online antifreeze pressure tapping device according to claim 1, characterized in that: The piston (3) extends downwards from the stepped hole (7) by a stepped shaft (8), which is clearance-fitted with the stepped hole (7). The bottom surface of the stepped shaft (8) is flush with the inner hole of the pressure tapping tube (1).

3. The online antifreeze pressure tapping device according to claim 1, characterized in that: The cap (4) has a conical hole (9) at the bottom. The lower end of the conical hole (9) starts from the inner wall of the riser (2) and the upper end of the conical hole (9) ends at the pressure tapping hole (6).

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