Single-well oil measuring device for simulating oil return pressure of oil well

Abstract

The utility model relates to the technical field of underground testing of water injection wells, in particular to a single-well oil measuring device for simulating oil return pressure of an oil well. Comprising a tank body, an emptying valve, an oil inlet pipe, an adjusting valve and a pressure gauge, the emptying valve, the oil inlet pipe, the adjusting valve and the pressure gauge are arranged on the outer wall of the tank body, the oil inlet pipe is communicated with the interior of the tank body, the adjusting valve comprises an adjusting valve shell and an adjusting lead screw, the adjusting valve shell is embedded into the tank body and internally provided with the adjusting lead screw, and an oil outlet is formed in the outer wall of the right side and connected with an oil outlet pipe. A threaded sealing cover is sleeved on the outer wall of the adjusting screw rod, the adjusting screw rod is inserted from the right end of the adjusting valve shell, a gland, a piston, a spring and a valve core are respectively arranged at the left end of the adjusting screw rod, and a valve seat is arranged on the inner wall of the left end of the adjusting valve shell. The oil return pressure is simulated by adjusting the lead screw to control the piston to compress or release the spring and adjusting the gap between the valve element and the valve seat, the emptying valve is arranged on the tank body, the tank body is prevented from being damaged due to too large pressure, and the device ensures the accuracy of single-well oil gauging and effectively improves the accuracy of single-well oil gauging of an oil well.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole testing of water injection wells, in particular to a single-well oil measuring device for simulating oil return pressure of an oil well. Background Art

[0002] Currently, many low-yield, low-efficiency wells in oil fields are commonly produced using a ring flow process. This process is characterized by the collection of production fluids from multiple wells into a common pipeline, which is then transported to a centralized processing facility. While this design simplifies equipment configuration and operational management to a certain extent, traditional glass tube oil measurement methods are ineffective in this process. In the absence of dedicated metering devices in the ring flow and metering room, single-well measurement is typically achieved using the following methods: liquid level recovery, work chart method, and vehicle-mounted weighing method. Each of these methods has its advantages and disadvantages, but all have limitations in practical application.

[0003] The liquid level recovery method and the work chart method rely primarily on data recorded by testing instruments and employ corresponding calculation methods to estimate oil well production. The liquid level recovery method estimates production by measuring the rate at which the oil well's liquid level recovers, while the work chart method estimates oil well output by analyzing the pumping unit's operating curve. However, the test data from these two methods often fail to fully and accurately reflect the actual oil well production, and contain certain errors.

[0004] The on-board weighing method involves directly releasing the well's output into a tanker truck and calculating the well's daily production by weighing it. This method seems straightforward, but because the well's output is transported through pipelines, there is a certain amount of pressure within the pipelines. This pressure is released during the direct release of the well's output into the tanker truck, leading to inaccurate measurement results. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] The utility model provides a single-well oil measuring device for simulating oil return pressure of an oil well, so as to overcome the problem in the prior art that there is no special oil measuring device for annular flow production oil wells.

[0007] (2) Technical solution

[0008] In order to achieve the above-mentioned object, the utility model provides a single-well oil measuring device for simulating oil return pressure of an oil well, comprising: a tank body;

[0009] The tank body is a hollow structure, and the outer wall of the tank body is respectively provided with a vent valve, an oil inlet pipe, a regulating valve and a pressure gauge;

[0010] The oil inlet pipe is arranged at the front end of the tank body, the oil inlet pipe is connected to the inside of the tank body, and the regulating valve is symmetrically arranged with the oil inlet pipe;

[0011] The regulating valve comprises: a regulating valve housing, the regulating valve housing being embedded in the tank body, an adjusting screw being provided in the regulating valve housing, an oil outlet hole being provided on the right outer wall of the regulating valve housing, and an oil outlet pipe being connected to the oil outlet hole;

[0012] The outer wall of the adjusting screw rod is covered with a threaded sealing cover, and the outer wall of the threaded sealing cover is in close contact with the inner wall of the adjusting valve housing;

[0013] The adjusting screw is inserted from the right end of the adjusting valve housing, the left end of the adjusting screw is provided with a pressure cover, and the left end of the pressure cover is provided with a piston;

[0014] The left end of the piston is provided with a spring, the left end of the spring is provided with a valve core, the inner wall of the left end of the regulating valve housing is provided with a valve seat, and the valve core can completely close the valve seat.

[0015] Preferably, the vent valve and the pressure gauge are arranged on one side, the vent valve and the pressure gauge are connected to the interior of the tank, and the vent valve is arranged at the upper end of the pressure gauge.

[0016] Preferably, the regulating valve housing is a hollow cylindrical structure, a sealing plate is provided at the right end of the regulating valve housing, and a through hole is provided at the center of the sealing plate.

[0017] Preferably, the adjusting screw consists of two parts, the left end of the adjusting screw is a cylindrical structure, and the right end is provided with a rotating handle, and the size of the through hole provided in the center of the sealing plate matches the radius size of the outer wall of the cylindrical structure at the left end of the adjusting screw.

[0018] Preferably, the adjusting screw is rotatably connected to the threaded sealing cover, and the threaded sealing cover is fixedly connected to the inner wall of the adjusting valve housing.

[0019] Preferably, it further comprises a plurality of sealing rings, wherein the sealing ring is an annular structure, the piston is a cylindrical structure, and the outer wall of the piston is provided with a plurality of annular grooves, wherein the sealing rings are respectively embedded in the annular grooves.

[0020] Preferably, the outer diameter of the piston matches the inner diameter of the regulating valve housing, and the piston can slide axially in the regulating valve housing.

[0021] Preferably, the left end of the valve core is a conical structure and the right end is a cylindrical structure. The outer wall of the cylindrical structure is covered with a spring. The valve seat is a hollow cylindrical structure. The right end of the valve seat is provided with a bevel that matches the taper of the left end of the valve core.

[0022] (3) Beneficial effects

[0023] The utility model provides a single-well oil measuring device for simulating the return oil pressure of an oil well, which can simulate the return oil pressure of the oil well through an adjusting valve in the device. The measured oil liquid is the same as the oil transported in the system, and is output under a stable oil pressure, avoiding the previous method of outputting oil by pressure relief and oil discharge, thereby ensuring the accuracy of the oil measuring of the single well; by controlling the screw rod to be screwed in and out according to the return oil pressure value, the piston is compressed or released to adjust the gap between the valve core and the valve seat, thereby ensuring that the oil output pressure and the return oil pressure of the device are consistent, achieving the purpose of simulating the back pressure; a vent valve is provided on the tank body of the device, when the device is filled with gas produced by the oil well and is blocked in the device by oil, when the gas pressure in the tank body is greater than 5Mpa, the vent valve will automatically open to release the pressure, avoiding damage and leakage of the tank body due to excessive pressure, thereby achieving the purpose of effectively improving the accuracy of the oil measuring of the single well of the oil well. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic cross-sectional view of a single-well oil measuring device for simulating oil return pressure in an oil well according to the present invention is shown;

[0025] Figure 2 The utility model shows a side structural schematic diagram of a single-well oil measuring device for simulating oil return pressure of an oil well.

[0026] Among them: 1: oil pipe; 2: tank body; 3: adjusting valve housing; 4: adjusting screw; 5: valve seat; 6: threaded sealing cover; 7: pressure cover; 8: piston; 9: valve core; 10: spring; 11: sealing ring; 12: vent valve; 13: oil outlet pipe; 14: pressure gauge. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.

[0029] like Figure 1-2 As shown, the utility model provides a single-well oil measuring device for simulating oil return pressure of an oil well, comprising: a tank body 2;

[0030] The tank body 2 is a hollow structure. The outer wall of the tank body 2 is respectively provided with a vent valve 12, an oil inlet pipe 1, an adjusting valve and a pressure gauge 14. The vent valve 12 and the pressure gauge 14 are arranged on one side. The vent valve 12 and the pressure gauge 14 are connected to the inside of the tank body 2. The vent valve 12 is arranged on the upper end of the pressure gauge 14. When the air pressure in the tank body 2 increases to 5MPa, the vent valve 12 will be opened by the air pressure, thereby performing a pressure relief operation to prevent the tank body 2 from being damaged due to excessive pressure. The oil inlet pipe 1 is arranged on the tank body 2. At the front end, the oil inlet pipe 1 is connected to the interior of the tank body 2. The oil inlet pipe 1 is used to connect to the oil pipe vent valve of the oil well, close the oil well production valve, open the oil pipe vent valve, and let the oil enter the tank body 2 of the device. The adjusting valve is symmetrically arranged with the oil inlet pipe 1. The adjusting valve is used to regulate the pressure in the tank body 2. The pressure in the tank body can be adjusted by cooperating with the adjusting valve and the pressure gauge 14 to ensure that the oil flowing out of the device is equivalent to the oil output under stable oil pressure, and there will be no pressure difference problem.

[0031] The regulating valve includes: an regulating valve housing 3, which is embedded in the tank body 2, and is a hollow cylindrical structure. A sealing plate is provided at the right end of the regulating valve housing 3, and a through hole is provided in the center of the sealing plate. The size of the through hole matches the radius size of the outer wall of the cylindrical structure at the left end of the adjusting screw 4, ensuring a tight fit. An oil outlet hole is provided on the right outer wall of the regulating valve housing 3, and the oil outlet hole guides the flow of oil by connecting to the oil outlet pipe 13.

[0032] The adjusting valve housing 3 is provided with an adjusting screw 4, which consists of two parts. The left end of the adjusting screw 4 is a cylindrical structure, and the right end is provided with a rotating handle for easy manual operation. The through hole in the center of the sealing plate allows the adjusting screw 4 to pass through while maintaining a sealed state. In order to achieve this, the outer wall of the adjusting screw 4 is covered with a threaded sealing cover 6. The outer wall of the threaded sealing cover 6 is close to the inner wall of the adjusting valve housing 3 to form a tight seal. The threaded sealing cover 6 is a hollow cylindrical structure, and the inner wall of the threaded sealing cover 6 is provided with threads. The adjusting screw 4 and the threaded sealing cover 6 are connected in a rotating manner, and the threaded sealing cover 6 is fixedly connected to the inner wall of the adjusting valve housing 3, ensuring that the adjusting screw 4 can rotate while ensuring the stability of the structure.

[0033] The adjusting screw 4 is inserted from the right end of the adjusting valve housing 3, and a pressure cover 7 is provided at the left end of the adjusting screw 4. A piston 8 is connected to the left end of the pressure cover 7. The piston 8 has a cylindrical structure, and its outer wall is provided with several annular grooves. A sealing ring 11 is embedded in each groove. These sealing rings are annular structures, which ensure the sealing between the piston 8 and the adjusting valve housing 3. The outer diameter of the piston 8 matches the inner diameter of the adjusting valve housing 3, so that it can slide axially in the housing 3.

[0034] A spring 10 is provided at the left end of the piston 8, and a valve core 9 is provided at the left end of the spring 10. A valve seat 5 is provided on the inner wall of the left end of the regulating valve housing 3. The left end of the valve core 9 is a conical structure and the right end is a cylindrical structure. The outer wall of the cylindrical structure is sleeved with a spring 10. The valve seat 5 is a hollow cylindrical structure. The right end of the valve seat 5 is provided with a bevel that matches the taper of the left end of the valve core 9. The valve core 9 can completely close the valve seat 5 to effectively control the flow of oil.

[0035] The design of the adjustment screw 4 allows it to rotate within the threaded sealing cap 6, enabling inward and outward rotation. This rotational movement directly affects the position of the piston 8, which in turn compresses or releases the spring 10. In this way, the opening and closing gap between the valve core 9 and the valve seat 5 can be precisely controlled, thereby regulating the pressure within the tank 2.

[0036] In actual operation, the user can adjust the position of the adjusting screw 4 according to the original oil pressure value of the oil well. Specifically, when the pressure in the tank body 2 needs to be increased, the spring 10 can be compressed by screwing in the adjusting screw 4, so that the valve core 9 is close to the valve seat 5, the opening and closing gap is reduced, and the flow of oil is restricted; on the contrary, when the pressure in the tank body 2 needs to be reduced, the spring 10 can be released by screwing out the adjusting screw 4, so that the valve core 9 is away from the valve seat 5, the opening and closing gap is increased, and the flow of oil is promoted.

[0037] During the entire adjustment process, the pressure gauge 14 plays a vital monitoring role. The user can understand the pressure changes in the tank body 2 in real time by observing the reading of the pressure gauge 14. When the pressure value displayed by the pressure gauge 14 is consistent with the original oil pressure value of the oil well, it can be considered that the pressure in the tank body 2 has reached the required stable state. The oil flowing out of the device is the oil production under the simulated system pressure, which can truly reflect the production of the oil well under specific pressure conditions.

[0038] The following is a detailed introduction to the actual working scenario of a single-well oil measuring device for simulating oil return pressure in an oil well.

[0039] The actual working process of the single-well oil measuring device for simulating oil return pressure of oil wells includes the following steps:

[0040] Step S1: First, the return oil pressure of the target oil well needs to be measured. This is the basis for subsequent adjustments and operations. The oil inlet pipe 1 of the single-well oil measuring device that simulates the return oil pressure of the oil well is installed on the oil pipe vent gate of the oil well to ensure the sealing of all connection parts.

[0041] Step S2: Open the oil pipe vent gate to allow the oil to enter the tank body 2. At the same time, close the production gate to ensure that the oil only flows into the oil measuring device. As the oil continues to flow in, the pressure in the tank body 2 gradually increases.

[0042] Step S3: When the tank 2 is filled with oil, the pressure continues to rise. At this time, the spring 10 is in a fully released state. Under the action of the oil pressure, the valve core 9 is pushed away from the valve seat 5. When the valve core 9 is pushed past the oil outlet position of the adjustment valve housing 3, the oil begins to flow out of the oil outlet.

[0043] Step S4: Turn the rotary handle to screw in the adjusting screw 4, push the piston 8 inward to compress the spring 10 and push the valve core 9, observe the value indicated by the pressure gauge 14 installed on the device, and gradually adjust the adjusting screw 4 until the pressure in the tank 2 is consistent with the previously measured return oil pressure;

[0044] Step S5: When the pressure value displayed by the pressure gauge 14 is consistent with the return oil pressure, stop adjusting the adjusting screw 4. At this time, the oil flowing out of the oil outlet pipe 13 is the oil production under the simulated system pressure.

[0045] Step S6: Use the weighing method to weigh the outflowing oil, record the time of oil measurement, and calculate the daily production of the well based on the measured data.

[0046] It can be understood that the above-mentioned embodiments mentioned in the present invention can be combined with each other to form combined embodiments without violating the principle logic. Due to space limitations, the present invention will not elaborate on them.

[0047] Those skilled in the art will understand that in the above-mentioned method of the specific implementation method, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0048] The utility model provides a single-well oil measuring device for simulating the return oil pressure of an oil well. The regulating valve in the device simulates the return oil pressure of the oil well. The measured oil is the same as the oil transported in the system, and is output under a stable oil pressure, avoiding the previous method of outputting oil by pressure relief and oil discharge, thereby ensuring the accuracy of single-well oil measuring; by controlling the adjusting screw rod, the screwing in and out of the adjusting screw rod is controlled according to the return oil pressure value, so that the piston compresses or releases the spring to adjust the gap between the valve core and the valve seat, thereby ensuring that the oil output pressure and the return oil pressure of the device are consistent, achieving the purpose of simulating back pressure; a vent valve is provided on the tank body of the device. When the device is filled with gas produced by the oil well and is blocked by oil in the device, when the gas pressure in the tank body is greater than 5Mpa, the vent valve will automatically open to release the pressure, avoiding damage and leakage of the tank body due to excessive pressure, thereby achieving the purpose of effectively improving the accuracy of single-well oil measuring

[0049] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A single-well oil measuring device for simulating oil return pressure in an oil well, characterized in that: include: Tank (2); The tank body (2) is a hollow structure, and the outer wall of the tank body (2) is respectively provided with a vent valve (12), an oil inlet pipe (1), a regulating valve and a pressure gauge (14); The oil inlet pipe (1) is arranged at the front end of the tank body (2), the oil inlet pipe (1) is communicated with the interior of the tank body (2), and the regulating valve and the oil inlet pipe (1) are symmetrically arranged; The regulating valve comprises: a regulating valve housing (3), the regulating valve housing (3) being embedded in the tank body (2), an adjusting screw rod (4) being provided in the regulating valve housing (3), an oil outlet hole being provided on the right outer wall of the regulating valve housing (3), and an oil outlet pipe (13) being connected to the oil outlet hole; The outer wall of the adjusting screw rod (4) is covered with a threaded sealing cover (6), and the outer wall of the threaded sealing cover (6) is in close contact with the inner wall of the adjusting valve housing (3); The adjusting screw rod (4) is inserted from the right end of the adjusting valve housing (3), the left end of the adjusting screw rod (4) is provided with a pressure cover (7), and the left end of the pressure cover (7) is provided with a piston (8); A spring (10) is provided at the left end of the piston (8), a valve core (9) is provided at the left end of the spring (10), a valve seat (5) is provided on the inner wall of the left end of the regulating valve housing (3), and the valve core (9) can completely close the valve seat (5).

2. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 1, characterized in that: The vent valve (12) and the pressure gauge (14) are arranged on one side, the vent valve (12) and the pressure gauge (14) are connected to the interior of the tank body (2), and the vent valve (12) is arranged at the upper end of the pressure gauge (14).

3. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 1, characterized in that: The regulating valve housing (3) is a hollow cylindrical structure. A sealing plate is provided at the right end of the regulating valve housing (3), and a through hole is provided at the center of the sealing plate.

4. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 3, characterized in that: The adjusting screw rod (4) is composed of two parts. The left end of the adjusting screw rod (4) is a cylindrical structure, and the right end is provided with a rotating handle. The size of the through hole provided in the center of the sealing plate matches the radius size of the outer wall of the cylindrical structure at the left end of the adjusting screw rod (4).

5. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 1, characterized in that: The adjusting screw rod (4) is rotatably connected to the threaded sealing cover (6), and the threaded sealing cover (6) is fixedly connected to the inner wall of the adjusting valve housing (3).

6. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 1, characterized in that: It also includes a plurality of sealing rings (11), the sealing rings (11) are annular structures, the piston (8) is a cylindrical structure, and the outer wall of the piston (8) is provided with a plurality of annular grooves, wherein the sealing rings (11) are respectively embedded in the annular grooves.

7. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 1, characterized in that: The outer diameter of the piston (8) matches the inner diameter of the regulating valve housing (3), and the piston (8) can slide axially in the regulating valve housing (3).

8. The single-well oil measuring device for simulating oil return pressure of an oil well according to claim 1, characterized in that: The left end of the valve core (9) is a conical structure and the right end is a cylindrical structure. The outer wall of the cylindrical structure is covered with a spring (10). The valve seat (5) is a hollow cylindrical structure. The right end of the valve seat (5) is provided with a bevel that matches the taper of the left end of the valve core (9).

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