Pressure data acquisition device for oil field

Abstract

The invention discloses a pressure data acquisition device for an oil field, and relates to the field of pressure monitoring. During normal detection, pressure enters a fluid chamber through a three-way pipe, a water body compresses air in an air compression chamber, the pressure enables a membrane body cavity to detect deformation of a membrane body and a strain gauge, and an electronic bin sends data of the strain gauge and a liquid level sensor to an upper computer. When instant high pressure exceeds a rated range, the impact piston responds firstly, and the spring shrinks to realize primary pressure reduction; the connecting rod drives the sealing piston to pump part of air in the pumping chamber, so that the telescopic cylinder retracts, the sealing plate and the inlet of the three-way pipe are staggered, and secondary buffering is completed; and the air compression chamber pumps fluid and supplements solution in the fluid chamber to realize tertiary buffering. After the pressure is recovered, the spring and the telescopic cylinder are reset. After petroleum enters, heavy gravels settle, light oil bodies and wax float upwards, pressure is transmitted through water, the detection end is prevented from making direct contact with the oil bodies, and adverse effects are reduced. The large communicating opening guarantees the response speed, and the automatic necking-down effect is reduced when the pressure is suddenly increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pressure monitoring, in particular to a pressure data acquisition device for oilfields. BACKGROUND

[0002] In the process of oilfield exploitation, pressure fluctuation in the wellbore and surface pipeline is inevitable, and in some special working conditions, the pressure will suddenly increase in a short time. This transient overpressure not only affects production safety, but also can cause damage to pressure detection devices.

[0003] When high-pressure oil and gas suddenly appear in the formation and channel into the wellbore, the fluid pressure in the wellbore will instantaneously rise, forming a shock wave that directly acts on the detection device. In water injection or fracturing operations, if the pumping pressure suddenly changes or the back pressure valve fails, the liquid is quickly squeezed into the confined space, which can cause a transient high-pressure impact. When gas and liquid are mixed in the pipeline, the gas slug is pushed to the pressure detection position by the liquid during flow, and the sudden release of gas can cause severe pressure fluctuations. In downhole operations, if the wellhead valve or throttling device is suddenly closed due to improper operation, the high-speed fluid is instantaneously cut off, which can also cause a sharp increase in pressure.

[0004] These abnormal pressure pulses usually exceed the design pressure limit of the detection device, causing mechanical deformation, failure or even rupture of the internal sensitive elements, which in turn affects the pressure monitoring accuracy and service life of the equipment.

[0005] The traditional method delays the fluid impact by limiting the size of the connection opening of the pressure detector pipeline, thereby weakening the direct effect of the transient pressure fluctuation on the detection device. Although this structure can filter out most of the short-time pressure pulses to some extent, the transmission speed of the pressure signal is significantly slowed down due to the limited opening cross-sectional area, resulting in a delayed response of the detector to the real pressure change and an inability to accurately reflect the transient pressure state inside the pipeline or wellbore. In addition, a too small connection opening is easily blocked by solid particles, deposits or wax in long-term operation, further increasing the response delay and even causing detection data distortion, thereby affecting the real-time and safety of oilfield production control. SUMMARY

[0006] The purpose of the present application is to solve the problem of the influence of transient pressure on the service life of traditional pressure transmitters during pressure detection in oilfield pipelines.

[0007] In order to achieve the above object, the present application adopts the following technical scheme: the oilfield pressure data acquisition device comprises a Pascal pressure chamber communicated with an oilfield pipeline and a pressure transmitter mounted thereon, further comprises a buffer and a responder for buffering instantaneous high pressure, the Pascal pressure chamber comprises a fluid chamber and a sedimentation chamber communicated at the bottom of the fluid chamber, the responder comprises a tee communicated with the oilfield pipeline and the fluid chamber, and the other end of the tee is provided with an extraction chamber, and an elastic air-tight member for responding and buffering the instantaneous high pressure of the oilfield pipeline is slidably arranged in the tee and the extraction chamber; The buffer comprises an air chamber communicated with the fluid chamber and the extraction chamber, one side of the air chamber is communicated with a telescopic cylinder, and a sealing plate is fixed at the telescopic end of the cylinder. When the instantaneous high pressure occurs, the end advantage causes the elastic air-tight member to first respond and form an air chamber in a negative pressure state in an instant, the telescopic cylinder displaces the sealing plate to reduce the size of the inlet of the fluid chamber, and the air chamber extracts part of the liquid in the fluid chamber, so that the instantaneous pressure is reduced after the instantaneous high pressure of the tee passes through the reduced inlet and combines with the reduction of the liquid in the fluid chamber.

[0008] As a further description of the above technical scheme, the Pascal pressure chamber further comprises a hand valve communicated with the fluid chamber and the sedimentation chamber, and the top of the fluid chamber is provided with a liquid supplementing port.

[0009] As a further description of the above technical scheme, the pressure transmitter comprises a detection end mounted and communicated at the top of the fluid chamber, a diaphragm cavity communicated with the detection end, an electronic bin for detecting the strain gauge deformation amount of the diaphragm threadedly connected at the top of the diaphragm cavity, and a socket for wiring and power supply.

[0010] As a further description of the above technical scheme, the sealing plate is slidably arranged on one side of the fluid chamber, and a through hole coinciding with the inlet of the tee at the corresponding position is formed in the sealing plate, the air chamber is arranged in a spherical shape and is provided with a liquid level sensor on the side wall, and the liquid level sensor monitors the change of the liquid level height of the air chamber according to the change of the pressure data to obtain the change amplitude of the instantaneous pressure.

[0011] As a further description of the above technical scheme, the elastic air-tight member comprises an impact piston slidably arranged in the tee and a sealing piston slidably arranged in the inner wall of the extraction chamber, a connecting rod is fixedly arranged on the opposite sides of the impact piston and the sealing piston, the connecting rod is slidably arranged on one side of the extraction chamber, and a spring for supporting the impact piston to return is spirally wound on the surface of the connecting rod.

[0012] As a further description of the above technical scheme, the bottom of the fluid chamber is arranged in a bucket shape, the top is arranged in an inclined surface, and the communication point of the air chamber in the fluid chamber is lower than the communication point of the tee and the fluid chamber.

[0013] As a further description of the above technical solution: one end of the tee pipe is communicated with a connecting piece communicated with the oil field pipeline installation, and a plurality of constant pressure holes are formed in the surface of the tee pipe.

[0014] As a further description of the above technical solution: the fluid chamber is filled with an aqueous solution, the air chamber is filled with air, and the water level is located at the bottom quarter of the air chamber.

[0015] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are: Under normal working conditions, the fluid chamber filled with an aqueous solution as a stabilizing medium quickly and accurately transmits the pipeline pressure to the pressure transmitter, the detection end at the top of the fluid chamber, the membrane cavity and the electronic bin ensure the direct collection and timely uploading of the strain gauge signal, so that real-time monitoring and control can be based on real pressure values, thereby avoiding the problem of response lag caused by a small opening. Through a larger communication opening, the speed of pressure response is ensured, and the displacement of the sealing plate is ensured during the process of instantaneous pressure increase, and the size of the opening is reduced in a short time to reduce the influence of instantaneous pressure.

[0016] When a transient high pressure impact occurs, the impact piston first responds with an end advantage and realizes preliminary energy absorption and instantaneous pressure reduction through the spring, then the connecting rod drives the sealing piston to make the extraction chamber pressure drop to trigger the telescopic cylinder to act and make the sealing plate dislocation to reduce the tee pipe inlet to realize the second attenuation, and the air chamber extracts fluid to supplement itself to form the third buffer, and the three physical mechanisms successively share the impact energy and significantly reduce the peak pressure transmitted to the fluid chamber and the transmitter, thereby effectively avoiding damage to the detection end due to overload.

[0017] In terms of structure maintenance and anti-pollution, the sedimentation function of the sedimentation chamber isolates particles with greater density, and light media float on water, avoiding direct contact of the pressure transmitter, reducing the frequency of manual intervention and improving the availability during online operation, and ensuring the stability of long-term use.

[0018] The liquid level sensor and the strain gauge deformation variable data are jointly output to provide double-channel physical quantities for the upper computer, and based on the joint criterion of the two signals, the instantaneous impact amplitude and abnormal mode can be more accurately identified, thereby realizing more reliable alarm threshold setting and subsequent protection action strategy, and comprehensively improving the stability, impact resistance and operation safety of the oil field pressure monitoring system. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of the present application; Figure 2 is another perspective view of the present application; Figure 3 is a sectional view of the present application; Figure 4This is an exploded view of the present invention; Figure 5 This is a frontal cross-sectional view of the present invention; Figure 6 This is an exploded view of the buffer and responder of the present invention.

[0020] Legend: 10. Pascal pressure chamber; 11. Fluid chamber; 12. Inlet; 13. Hand valve; 14. Settling chamber; 20. Pressure transmitter; 21. Membrane cavity; 22. Detection end; 23. Electronic compartment; 24. Port; 30. Buffer; 31. Air compressor chamber; 32. Telescopic cylinder; 33. Sealing plate; 34. Through hole; 35. Liquid level sensor; 40. Responder; 41. Tee; 42. Extraction chamber; 43. Elastic airtight component; 431. Connecting rod; 432. Impact piston; 433. Sealing piston; 434. Spring; 44. Constant pressure orifice; 50. Connectors. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 - Figure 6 As shown, the present invention provides an oilfield pressure data acquisition device, including a Pascal pressure chamber 10 connected to an oilfield pipeline and a pressure transmitter 20 installed thereon, and also includes a buffer 30 and a responder 40 located on the Pascal pressure chamber 10 to buffer instantaneous high pressure. The Pascal pressure chamber 10 includes a fluid chamber 11 and a settling chamber 14 connected to its bottom. The responder 40 includes a three-way pipe 41 connecting the oilfield pipeline and the fluid chamber 11, and an extraction chamber 42 is installed at the other end of the three-way pipe 41. An elastic airtight component 43 that responds to and buffers instantaneous high pressure in the oilfield pipeline slides together in the three-way pipe 41 and the extraction chamber 42. The buffer 30 includes an air compressor chamber 31 that connects the fluid chamber 11 and the extraction chamber 42, and a telescopic cylinder 32 is connected to one side of the air compressor chamber 31, as well as a sealing plate 33 fixed to the telescopic end of the cylinder. When the instantaneous high pressure occurs, the end advantage causes the elastic air-tight piece 43 to respond first and form the negative pressure state of the air compression chamber 31 instantaneously, the telescopic cylinder 32 displaces the sealing plate 33 to reduce the size of the inlet of the fluid chamber 11, and the air compression chamber 31 extracts the liquid of the fluid chamber 11, so that the instantaneous high pressure of the three-way pipe 41 is combined with the reduction of the liquid of the fluid chamber 11 to reduce the instantaneous pressure.

[0023] When the scheme is used, the connecting pipe is installed through the connecting piece 50, and the three-way pipe 41 of the responder 40 is connected with the connecting piece 50. When the normal detection pressure occurs, the pressure enters the fluid chamber 11 through the three-way pipe 41 (at this time, the spring 434 does not compress and supports the impact piston 432), the water body of the fluid chamber 11 compresses the air of the air compression chamber 31 according to the pressure change, the pressure acts on the membrane cavity 21 of the detection end 22 of the pressure transmitter 20, the detection membrane and the strain gauge are deformed, and the electronic bin 23 sends the data of the strain gauge and the data of the liquid level sensor 35 to the upper computer. When the instantaneous high pressure occurs and exceeds the rated range, the impact piston 432 responds first due to the end advantage, the spring 434 is compressed to realize the first instantaneous pressure reduction, the sealing piston 433 is displaced through the connecting rod 431 to extract part of the air of the extraction chamber 42, the telescopic cylinder 32 is retracted to displace the sealing plate 33, the through hole 34 of the sealing plate 33 is misaligned with the inlet of the three-way pipe 41 to reduce the opening, the second buffering is realized, the air compression chamber 31 extracts the solution of the fluid chamber 11 to complete the third buffering, and the spring 434 and the telescopic cylinder 32 are reset after the pressure is restored. During the process, the oil enters the three-way pipe 41 and the fluid chamber 11, the heavy sand and gravel are settled, the light oil body and the wax are floated, the pressure is transmitted through the water, the detection end 22 of the pressure transmitter 20 is prevented from directly contacting the oil body, the wax adhesion, impurity abrasion, chemical corrosion and measurement error are reduced, the pressure transmission stability and the detection long-term reliability are ensured, the large communication opening guarantees the pressure response speed, and the opening is automatically reduced to reduce the instantaneous influence when the pressure suddenly increases.

[0024] Specifically, as shown in Figure 2 and Fig. 5, the Pascal pressure chamber 10 further comprises a hand valve 13 communicating the fluid chamber 11 and the sedimentation chamber 14, and the top of the fluid chamber 11 is provided with a liquid supplementing port 12.

[0025] The Pascal pressure chamber 10 utilizes the Pascal principle, that is, the pressure applied on the closed liquid (or gas) can be transmitted to all directions of the liquid (or gas) with the same size. The pressure in the fluid chamber 11 is taken as a pressure relief point through the air compression chamber 31 in communication with the fluid chamber 11, so that the pressure can be filtered and buffered through the high-frequency pressure fluctuation of the compressed air, and the pressure fluctuation is understood by combining the liquid level change detected by the liquid level sensor 35, so that the numerical fluctuation of the pressure transmitter 20 is greatly reduced.

[0026] By setting the hand valve 13, the communication state of the fluid chamber 11 and the settling chamber 14 can be conveniently switched, so that the settling chamber 14 can be conveniently removed for cleaning or sampling to understand the distribution and content of heavy impurities in the pipeline.

[0027] By setting the liquid supplementing port 12, the water level in the fluid chamber 11 can be supplemented when it is reduced. The liquid supplementing port 12 is a one-way valve with a cover plate. By opening the protective cover plate, a syringe needle can be screwed in and water can be pushed in, so that the water can be conveniently supplemented quantitatively, and maintenance does not need to be disassembled or stopped.

[0028] Specifically, as shown in Figure 3 The pressure transmitter 20 includes a detection end 22 mounted and communicated at the top of the fluid chamber 11, and a diaphragm cavity 21 communicated with the detection end 22. The top of the diaphragm cavity 21 is threadedly connected with an electronic bin 23 for detecting the strain gauge deformation of the diaphragm. The pressure transmitter 20 also includes a socket 24 for wiring and power supply.

[0029] The detection end 22 of the pressure transmitter 20 is immersed in the water solution and does not contact the crude oil, so there is no wear or wax impurities to block the detection end 22. At the same time, the diaphragm cavity 21 and the electronic bin 23 can be separated by threads, so that the diaphragm inside can be checked and maintained. After the diaphragm is replaced, the electronic bin 23 and the diaphragm cavity 21 are kept closed, and then the communication valve on the detection end 22 can be opened Specifically, as shown in Figure 3 and Figure 6 The sealing plate 33 is sealingly and slidingly arranged on one side of the fluid chamber 11. The sealing plate 33 is provided with a through hole 34 coinciding with the inlet of the corresponding communication tee pipe 41. The air chamber 31 is spherical and provided with a liquid level sensor 35 on the side wall. The liquid level sensor 35 monitors the change of the liquid level of the air chamber 31 to obtain the instantaneous pressure change amplitude according to the pressure data change.

[0030] By sealingly and slidingly arranging the sealing plate 33 in the fluid chamber 11, the inlet position of the tee pipe 41 and the fluid chamber 11 can be blocked when the sealing plate 33 is displaced.

[0031] Specifically, as shown in Figure 6 The elastic air-tight member 43 includes an impact piston 432 sliding in the tee pipe 41 and a sealing piston 433 sliding in the inner wall of the extraction chamber 42. The opposite sides of the impact piston 432 and the sealing piston 433 are fixedly connected with a connecting rod 431. The connecting rod 431 is sealingly and slidingly arranged on one side of the extraction chamber 42. The surface of the connecting rod 431 is spirally wound with a spring 434 for supporting the impact piston 432 to reset.

[0032] By setting the elastic air-tight member 43, the impact piston 432 has a better impact response effect, and the displacement of the sealing piston 433 is brought along by the connecting rod 431, and the spring 434 has a larger elastic coefficient, so that the elastic compression does not occur in the normal pressure detection process, and when the normal detection value is exceeded, the spring 434 is compressed to displace the impact piston 432.

[0033] Specifically, as shown in Figure 1 and Figure 3 , the bottom of the fluid chamber 11 is in the shape of a bucket, the top is in the shape of a slope, and the air chamber 31 is located at the communication point of the fluid chamber 11, which is lower than the communication point of the three-way pipe 41 and the fluid chamber 11.

[0034] The bottom of the fluid chamber 11 is in the shape of a bucket, which can better concentrate the sediment, and the top is in the shape of a slope, which can isolate the air chamber 31 from the three-way pipe 41, so that light materials floating on water cannot enter the air chamber 31, and only part of the water in the air chamber 31 can enter.

[0035] Specifically, as shown in Figure 3 , one end of the three-way pipe 41 is communicated with the connecting piece 50 communicated with the oil field pipeline installation, and a plurality of constant pressure holes 44 are arranged on the surface of the three-way pipe 41.

[0036] By adopting the connecting piece 50, the three-way pipe 41 can be conveniently communicated with it, and by adopting the constant pressure holes 44 arranged on the surface of the three-way pipe 41, the air on one side can flow with the outside when the impact piston 432 is displaced, so that the pressure difference is avoided.

[0037] Specifically, as shown in Figure 5 , the fluid chamber 11 is filled with water solution, and the air chamber 31 is filled with air and the water level is located at the bottom quarter of the air chamber 31.

[0038] The water level at the quarter of the fluid chamber 11 is the basic water level, which increases when the pressure is high and compresses the air, and when the pressure decreases, the air leakage into the fluid chamber 11 is avoided, which plays a redundant role in avoiding gas leakage when the pressure changes.

[0039] In use, the connecting piece 50 is installed and communicated on the oil field pipeline, while the tee pipe 41 of the response device 40 is kept in communication with the connecting piece 50, when detecting pressure, the pressure enters the fluid chamber 11 through the tee pipe 41 (the spring 434 will not be compressed and support the impact piston 432 in the normal pressure range of the pressure transmitter 20), the water in the fluid chamber 11 compresses the air in the air chamber 31 with the change of pressure, and the pressure acts on the membrane cavity 21 through the detection end 22 of the pressure transmitter 20, so that the detection membrane in the membrane cavity deforms, the strain gauge on the membrane deforms, and the electronic cabinet 23 sends the data of the strain gauge to the upper computer together with the data of the liquid level sensor 35; When the instantaneous high pressure occurs, the pressure exceeds the rated detection range of the pressure transmitter 20, the instantaneous increased pressure impacts the spring 434 to contract (the impact piston has the advantage of the top end of the pressure, so it responds first), the displacement of the impact piston performs an instantaneous pressure reduction, and the impact piston displaces the sealing piston 433 through the connecting rod 431, so that the sealing piston 433 instantaneously extracts part of the air in the extraction chamber 42, the telescopic cylinder 32 is first retracted under the action of the sudden pressure reduction in the extraction chamber 42, so that it displaces the partition plate, the through hole 34 opened on the sealing plate 33 is misaligned with the inlet connected with the fluid chamber 11 at one end of the tee pipe 41, so that the opening is reduced, realizing the secondary buffering of the high pressure of the tee pipe 41, and the air chamber 31 extracts part of the solution in the fluid chamber 11, so that the tee pipe 41 supplements the fluid chamber 11, realizing the third buffering, and after the pressure returns to the rated detection range, the spring 434 resets, so that the air chamber 31 maintains a high pressure state under the action of the pressure, and the telescopic cylinder 32 resets; In the above process, the oil in the pipeline enters the fluid chamber 11 after entering the tee pipe 41, a small amount of sand heavier than water enters the settling chamber 14, and the oil body and wax are lighter than water and float on the top to provide pressure. This way avoids the detection end 22 of the pressure transmitter 20 directly contacting the oil body, through this structure, the detection end 22 of the pressure transmitter 20 is in a relatively isolated state with the oil body, effectively avoiding the oil body directly contacting the detection element, thereby reducing the influence of wax adhesion, impurity abrasion and chemical corrosion in the oil on the detection end 22, and reducing the measurement error caused by the change of oil temperature and the complexity of components, ensuring the stability of pressure transmission and the long-term reliability of detection.

[0040] Meanwhile, the present application ensures the speed of pressure response through a larger communication opening, and reduces the influence of instantaneous pressure through the way of automatically reducing the size of the connecting port for a short time during the process of instantaneous pressure increase.

[0041] The above merely describes preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical scope disclosed by the present application and according to the technical solutions and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An oilfield pressure data acquisition device, comprising a Pascal pressure chamber (10) in communication with an oilfield pipeline and a pressure transmitter (20) mounted thereon, further comprising a buffer (30) and a responder (40) located on the Pascal pressure chamber (10) to communicate a buffer transient high pressure, characterized in that: The Pascal pressure chamber (10) comprises a fluid chamber (11) and a settling chamber (14) communicated with the bottom of the fluid chamber (11), the responder (40) comprises a tee (41) communicated with the fluid chamber (11) and the oilfield pipeline, and the other end of the tee (41) is provided with an extraction chamber (42), and the tee (41) and the extraction chamber (42) are jointly provided with an elastic air-tight member (43) slidably arranged therein, the elastic air-tight member (43) is used for responding and buffering the transient high pressure of the oilfield pipeline; The buffer (30) comprises an air pressure chamber (31) communicated with the fluid chamber (11) and the extraction chamber (42), one side of the air pressure chamber (31) is communicated with a telescopic cylinder (32), and the air pressure chamber (31) is provided with a sealing plate (33) fixed at the telescopic end of the telescopic cylinder (32). When the transient high pressure occurs, the end advantage causes the elastic air-tight member (43) to first respond and instantaneously form a negative pressure state of the air pressure chamber (31), the telescopic cylinder (32) is displaced to reduce the size of the fluid chamber (11) inlet with the sealing plate (33), and the air pressure chamber (31) extracts part of the liquid in the fluid chamber (11), the transient high pressure of the tee (41) passes through the reduced inlet, and the liquid in the fluid chamber (11) is reduced, so that the transient pressure is reduced.

2. The pressure data acquisition device for oil fields according to claim 1, characterized by The Pascal pressure chamber (10) further comprises a hand valve (13) communicated with the fluid chamber (11) and the settling chamber (14), and the top of the fluid chamber (11) is provided with a liquid supplementing port (12).

3. The oilfield pressure data acquisition device of claim 1, wherein, The pressure transmitter (20) comprises a detection end (22) installed and communicated at the top of the fluid chamber (11), a diaphragm cavity (21) communicated with the detection end (22), a top of the diaphragm cavity (21) is threadedly connected with an electronic bin (23) for detecting the deformation amount of the upper strain gauge of the diaphragm, and the electronic bin (23) is further provided with a socket (24) for wiring and power supply.

4. The pressure data acquisition device for oil fields according to claim 1, characterized by The sealing plate (33) is sealingly and slidably arranged on one side of the fluid chamber (11), the sealing plate (33) is provided with a through hole (34) coinciding with the inlet of the corresponding communicated tee (41) position, the air pressure chamber (31) is provided in a spherical shape, and a liquid level sensor (35) is mounted on the side wall of the air pressure chamber (31), the liquid level sensor (35) is used for monitoring the liquid level height change of the air pressure chamber (31) to obtain the transient pressure change amplitude according to the pressure data change.

5. The oilfield pressure data acquisition device of claim 1, wherein, The elastic air-tight member (43) comprises an impact piston (432) slidably arranged in the tee (41) and a sealing piston (433) slidably arranged in the inner wall of the extraction chamber (42), opposite sides of the impact piston (432) and the sealing piston (433) are jointly fixed with a connecting rod (431), the connecting rod (431) is sealingly and slidably arranged on one side of the extraction chamber (42), and the surface of the connecting rod (431) is spirally wound with a spring (434) for resiliently supporting the impact piston (432) to reset.

6. The pressure data acquisition device for oil fields according to claim 1, characterized by The bottom of the fluid chamber (11) is provided in a bucket shape, the top is provided in an inclined surface, and the communication point of the air pressure chamber (31) is lower than the communication point of the tee (41) and the fluid chamber (11).

7. The pressure data acquisition device for oil fields according to claim 1, characterized by One end of the tee (41) is communicated with a connecting piece (50) communicated with the oilfield pipeline, and a plurality of constant pressure holes (44) are formed in the surface of the tee (41).

8. The pressure data acquisition device for use in an oilfield of claim 1, wherein, The fluid chamber (11) is filled with an aqueous solution, and the air pressure chamber (31) is filled with air, and the water level is located at the bottom quarter of the air pressure chamber (31).

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