Multifunctional sampling device for rod-pumped well

Abstract

The utility model relates to the technical field of oil production engineering, in particular to a multifunctional sampling device for a rod-pumped well. The multifunctional sampling device for the rod pumped well comprises a device shell, a sampling valve, a partition plate, rotating shafts and valve covers, the device shell is of a hollow cylindrical structure, the sampling valve and the partition plate are arranged in the device shell, the partition plate is an annular step, a circular liquid channel is formed in the center of the partition plate, the two symmetrical rotating shafts are arranged on the right end face, and the valve covers are arranged on the rotating shafts and rotationally connected with the rotating shafts. The multifunctional sampling device for the rod pumped well is connected with a production valve of a Christmas tree of the rod pumped well through the hoop connector, the right side of the multifunctional sampling device is welded and connected with an oil return flow of the Christmas tree, and normal flowing of oil is not affected; the sampling valve is arranged in the device shell, so that a sampling hole of the sampling valve is wrapped by well fluid, and the sampling valve is prevented from being blocked and frozen; when the watering valve is not tight, the valve cover can be closed under the action of pressure difference to prevent watering from flowing out along with well fluid, and sampling data are ensured to be accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production engineering, in particular to a multifunctional sampling device for a pumping well. Background Art

[0002] Sampling from machine-drilled wells is one of the key operations for determining the water content of crude oil and calculating production indicators. To ensure the accuracy of sampling, the traditional sampling process requires stopping water addition for 5 to 10 minutes before sampling and draining the "dead oil" in the sampling valve. This operation method is not only time-consuming, but also easily causes environmental pollution during the process of discharging the "dead oil".

[0003] In the traditional method, the operator first needs to close the water injection valve, wait 5 to 10 minutes to ensure that the water injection has completely stopped, and then open the sampling valve to discharge the "dead oil" in it. This "dead oil" is usually crude oil that has been standing for a period of time and may contain high moisture and other impurities. Discharging this "dead oil" not only wastes precious resources, but may also pollute the environment. Especially if the operation is improper, this waste oil may leak into the soil and water sources, causing long-term ecological damage.

[0004] Inaccurate sampling results can occur due to problems with the water injection valve sealing or improper sampling by operators. This not only affects the judgment of the water content of the crude oil and the calculation of production indicators, but may also lead to more serious problems, such as frozen wells. Frozen wells refer to the situation in which, in a low-temperature environment, water enters the wellbore due to a loose seal of the water injection valve and freezes, causing blockage of the wellbore, seriously affecting the normal production of the oil field. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] The utility model provides a multifunctional sampling device for oil pumping wells, which overcomes the problem in the prior art that the traditional sampling operation of machine-pumped wells is easy to cause loose water addition and affect data collection by adjusting the water addition valve.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides a multifunctional sampling device for a pumping well, comprising: a device housing;

[0009] The device housing is a hollow cylindrical structure, and a sampling valve is provided in the device housing;

[0010] A partition is provided in the housing of the device, the partition is an annular step provided on the inner wall of the housing of the device, and a circular liquid passage is provided in the center of the partition;

[0011] The right end surface of the partition is provided with two symmetrical rotation shafts, and the rotation shafts are provided with valve covers, and the valve covers are rotatably connected to the two rotation shafts;

[0012] A clamp connector is provided at the left end of the device housing, and a discharge channel communicating with the interior of the device housing is provided on the right outer wall of the device housing;

[0013] The sampling valve comprises: a sampling valve housing and a sampling valve stem, wherein the sampling valve stem is arranged in the sampling valve housing and the sampling valve stem is threadedly connected to the sampling valve housing;

[0014] The outer wall of the lower end of the sampling valve stem is provided with a plurality of sealing rings.

[0015] Preferably, the sampling valve is vertically embedded in the device housing, and the sampling valve is fixedly connected to the device housing.

[0016] Preferably, the sampling valve is arranged on the left side of the partition.

[0017] Preferably, the rotating shaft is a rectangular structure with a circular through hole provided at the center of the rectangular structure, and the rotating shaft and the partition are made as one piece.

[0018] Preferably, the valve cover is a cylindrical structure, and a rotating connecting arm is provided on one side of the valve cover. The rotating connecting arm consists of two parts. The lower end of the rotating connecting arm is a rectangular structure, and the rectangular structure is made as a whole with the valve cover. Two connecting columns are symmetrically provided at the upper end of the rectangular structure, and the two connecting columns are respectively embedded in the rotating shaft.

[0019] Preferably, the outer diameter of the valve cover matches the inner diameter of the liquid passage provided in the center of the partition, and the valve cover can completely close the liquid passage.

[0020] Preferably, the sampling valve housing is a hollow cylindrical structure, and the outer wall of the lower end of the sampling valve housing is provided with two mutually perpendicular through holes, and the inner wall of the lower end of the through hole is provided with a tapered surface.

[0021] Preferably, the sampling valve stem is a cylindrical structure with a center, the outer wall of the cylindrical structure is provided with threads, the upper end of the cylindrical structure is provided with a rectangular structure, the lower end of the cylindrical structure is a conical structure, and the taper of the conical structure matches the conical surface of the inner wall of the lower end of the through hole.

[0022] (3) Beneficial effects

[0023] The utility model provides a multifunctional sampling device for a pumping well, which can be connected to the production valve of the oil tree of the pumping well by a clamp connector provided at the left end of the device shell, and connected to the oil return flow of the oil tree by welding on the right side, without affecting the normal flow of oil during operation; the sampling valve stem provided in the sampling valve seals the center of the sampling valve, and the well fluid outflow pipeline can be sampled at any time by rotating the sampling valve stem; the sampling valve is arranged on the inner side of the pipeline and the sampling valve is always in direct contact with the well fluid, thereby avoiding the situation that the sampling valve is blocked and frozen during sampling; when the water injection valve is not tight during the process, a part of the water injection will flow from the right side to the left side of the device shell after the sampling valve is opened during the sampling process, and the valve cover will be closed under the action of the pressure difference, playing the role of a one-way valve, thereby preventing a part of the water injection from flowing out of the sampling valve together with the well fluid during sampling, resulting in inaccurate water injection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model shows a schematic structural diagram of a multifunctional sampling device for pumping wells;

[0025] Figure 2 A cross-sectional schematic diagram of a multifunctional sampling device for a pumping well according to the present invention is shown;

[0026] Figure 3 The utility model shows a cross-sectional schematic diagram of a sampling valve of a multifunctional sampling device for a pumping well.

[0027] Among them: 1: device housing; 2: valve cover; 3: partition; 4: rotating shaft; 5: sampling valve housing; 6: sealing ring; 7: sampling valve stem; 8: sampling valve. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] 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.

[0030] like Figure 1-3 As shown, the utility model provides a multifunctional sampling device for a pumping well, comprising: a device housing 1;

[0031] The device housing 1 is a hollow cylindrical structure. A sampling valve 8 is provided inside the device housing 1. A clamp connector is provided at the left end of the device housing 1 for connecting to the production valve of the Christmas tree of the pumping well. A discharge channel is provided on the right outer wall of the device housing 1 that is connected to the interior of the device housing 1. The left end of the device housing 1 is connected to the production valve of the Christmas tree of the pumping well through a clamp connector, and the right side is connected to the oil return process of the Christmas tree by welding, ensuring that the device can smoothly transport well fluid from the Christmas tree to the oil return process during operation. The sampling valve 8 is vertically embedded in the device housing 1, and the sampling valve 8 is fixedly connected to the device housing 1.

[0032] The sampling valve 8 is the core component of the device, including a sampling valve housing 5 and a sampling valve stem 7. The sampling valve housing 5 is a hollow cylindrical structure, and its lower outer wall is provided with two mutually perpendicular through holes. These two through holes are sampling holes. In order to prevent the sampling holes from freezing in a low temperature environment and facilitate the sampling liquid to flow out from the lower end of the sampling valve 8, the inner wall of the lower end of the through hole is designed to be a cone.

[0033] The sampling valve stem 7 is arranged inside the sampling valve housing 5 and is connected to the sampling valve housing 5 through threads. The outer wall of the lower end of the sampling valve stem 7 is provided with multiple sealing rings 6 to ensure the sealing performance of the sampling valve 8. The center of the sampling valve stem 7 is a cylindrical structure with threads on its outer wall. The upper end is a rectangular structure, which is convenient for operation with a wrench, and the lower end is designed as a conical structure. The taper of the conical structure matches the conical surface of the inner wall of the lower end of the sampling hole, thereby achieving precise control of the sampling hole.

[0034] In actual operation, the sampling valve stem 7 can be moved up and down by rotating the rectangular structure at the upper end of the sampling valve stem 7 with a wrench. When the sampling valve stem 7 moves upward, the sampling hole is opened, and the well fluid can flow out from the lower end of the sampling valve housing 5 to complete the sampling operation. Conversely, when the sampling valve stem 7 moves downward, the sampling hole is closed to prevent well fluid leakage.

[0035] Since the sampling valve 8 is vertically embedded in the device housing 1, the sampling hole is always in contact with the well fluid flowing through the device housing 1, thereby effectively avoiding the sampling hole from being blocked and frozen during sampling. This design not only improves the reliability of sampling, but also greatly simplifies the operation process and reduces maintenance costs.

[0036] In order to further enhance the functionality and reliability of the multifunctional sampling device for oil pumping wells, a partition 3 is provided in the device housing 1. The partition 3 is located on the right side of the sampling valve 8 and is an annular step provided on the inner wall of the device housing 1. A circular liquid passage is provided in the center of the partition 3, which not only helps to separate the internal space of the device, but also ensures the orderly flow of well fluid in the device.

[0037] The right end face of the partition 3 is provided with two symmetrical rotating shafts 4, which are connected to the valve cover 2. The valve cover 2 is rotatably connected to the rotating shaft 4 through a rotating connecting arm. The rotating shaft 4 adopts a rectangular structure with a circular through hole in the center. It is made integral with the partition 3. The valve cover 2 itself is a cylindrical structure, and its outer diameter matches the inner diameter of the liquid passage in the center of the partition 3, which means that the valve cover 2 can completely close the liquid passage and prevent liquid from passing through this path.

[0038] A rotating connecting arm is provided on one side of the valve cover 2. The rotating connecting arm consists of two parts. The end is a rectangular structure, which is made as a whole with the valve cover 2. Two connecting columns are symmetrically provided on the upper end. These connecting columns are respectively embedded in the rotating shaft 4, so that the valve cover 2 can rotate freely within a certain range and open or close the liquid passage as needed.

[0039] In actual operation, when sampling is carried out, if the water injection valve in the process is not tight, part of the water injection will flow from right to left along the inner wall of the device shell 1 during the sampling process. At this time, after the sampling hole of the sampling valve 8 is opened, the valve cover 2 will automatically close under the action of the pressure difference, acting as a one-way valve. This can effectively prevent the water injection from flowing out of the sampling hole along with the well fluid, ensuring the accuracy of the sampling data. After the sampling is completed, the sampling valve 8 is closed, and the valve cover 2 is reopened under the push of the bottom hole pressure to resume the normal production process. This design not only improves the reliability and accuracy of the sampling device, but also greatly reduces the data error caused by water injection, thereby improving the overall work efficiency.

[0040] The following is a detailed introduction to the actual working scenario of a multifunctional sampling device for oil pumping wells.

[0041] In actual operation, the multifunctional sampling device for oil pumping wells includes the following steps:

[0042] Work preparation stage:

[0043] Step S1: Connect the left end of the device housing 1 to the production valve of the Christmas tree of the pumping well via a clamp connector. The right end of the device housing 1 is welded to the oil return line of the Christmas tree to ensure that the device can smoothly transport well fluid from the Christmas tree to the oil return line during operation.

[0044] Step S12, confirm whether the sealing ring 6 of the sampling valve 8 is intact to ensure the sealing performance of the sampling valve 8, check whether the rotating connecting arm of the valve cover 2 is flexible to ensure that the valve cover 2 can rotate freely as needed.

[0045] Sampling operation stage:

[0046] Step S2: Use a wrench to rotate the rectangular structure at the upper end of the sampling valve stem 7 to move the sampling valve stem 7 upward. When the conical structure of the sampling valve stem 7 is separated from the sampling hole, the sampling hole is opened and the well fluid begins to flow out from the lower end of the sampling valve housing 5.

[0047] During the sampling process, if the water injection valve in the process is not tight, some of the water injection may flow from right to left along the inner wall of the device housing 1. The valve cover 2 will automatically close under the action of the pressure difference, acting as a one-way valve to prevent the water injection from flowing out of the sampling hole along with the well fluid, thereby ensuring the accuracy of the sampling data.

[0048] Step S22, when sampling is completed, the sampling valve stem 7 is rotated in the opposite direction to move it downward, and the conical structure re-closes the sampling hole to prevent well fluid leakage. The valve cover 2 is reopened under the push of the bottom hole pressure, and the normal production process is restored.

[0049] 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.

[0050] 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.

[0051] The utility model provides a multifunctional sampling device for a pumping well, which is connected to the production valve of the oil tree of the pumping well by a clamp connector provided at the left end of the device shell 1, and is connected to the oil return process of the oil tree by welding on the right side, so that the normal flow of oil is not affected during operation; the sampling valve stem 7 provided in the sampling valve 8 closes the center of the sampling valve 8, and the well fluid outflow pipeline can be sampled at any time by rotating the sampling valve stem 7; the sampling valve 8 is arranged on the inner side of the pipeline and the sampling valve 8 is always in direct contact with the well fluid, thereby avoiding the situation where the sampling valve is blocked and frozen during sampling; when the water injection valve is not tight during the sampling process, after the sampling valve 8 is opened during the sampling process, a part of the water injection will flow from the left side to the right side of the device shell, and the valve cover 2 will be closed under the action of the pressure difference, playing the role of a one-way valve, thereby preventing a part of the water injection from flowing out of the sampling valve together with the well fluid during sampling, resulting in inaccurate water injection data.

[0052] 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 multifunctional sampling device for a pumping well, characterized in that: include: Device housing (1); The device housing (1) is a hollow cylindrical structure, and a sampling valve (8) is provided in the device housing (1); A partition (3) is provided in the device housing (1), the partition (3) being an annular step provided on the inner wall of the device housing (1), and a circular liquid passage being provided at the center of the partition (3); The right end surface of the partition (3) is provided with two symmetrical rotation shafts (4), the rotation shafts (4) are provided with a valve cover (2), and the valve cover (2) is rotatably connected to the two rotation shafts (4); The left end of the device housing (1) is provided with a clamp connector, and the right outer wall of the device housing (1) is provided with a discharge channel communicating with the interior of the device housing (1); The sampling valve (8) comprises: a sampling valve housing (5) and a sampling valve stem (7), wherein the sampling valve stem (7) is arranged in the sampling valve housing (5), and the sampling valve stem (7) is threadedly connected to the sampling valve housing (5); The outer wall of the lower end of the sampling valve stem (7) is provided with a plurality of sealing rings (6).

2. The multifunctional sampling device for pumping wells according to claim 1, characterized in that: The sampling valve (8) is vertically embedded in the device housing (1), and the sampling valve (8) is fixedly connected to the device housing (1).

3. The multifunctional sampling device for pumping wells according to claim 1, characterized in that: The sampling valve (8) is arranged on the left side of the partition (3).

4. The multifunctional sampling device for pumping wells according to claim 1, characterized in that: The rotating shaft (4) is a rectangular structure, a circular through hole is provided at the center of the rectangular structure, and the rotating shaft (4) and the partition (3) are made into one piece.

5. The multifunctional sampling device for pumping wells according to claim 4, characterized in that: The valve cover (2) is a cylindrical structure. A rotating connecting arm is provided on one side of the valve cover (2). The rotating connecting arm is composed of two parts. The lower end of the rotating connecting arm is a rectangular structure. The rectangular structure and the valve cover (2) are made as one body. Two connecting columns are symmetrically provided on the upper end of the rectangular structure. The two connecting columns are respectively embedded in the rotating shaft (4).

6. The multifunctional sampling device for pumping wells according to claim 5, characterized in that: The outer diameter of the valve cover (2) matches the inner diameter of the liquid passage provided at the center of the partition (3), and the valve cover (2) can completely close the liquid passage.

7. The multifunctional sampling device for pumping wells according to claim 1, characterized in that: The sampling valve housing (5) is a hollow cylindrical structure. The outer wall of the lower end of the sampling valve housing (5) is provided with two mutually perpendicular through holes, and the inner wall of the lower end of the through hole is provided with a tapered surface.

8. The multifunctional sampling device for pumping wells according to claim 7, characterized in that: The sampling valve stem (7) is a cylindrical structure with a center, a thread is provided on the outer wall of the cylindrical structure, a rectangular structure is provided on the upper end of the cylindrical structure, and a conical structure is provided on the lower end of the cylindrical structure, the taper of the conical structure matches the conical surface of the inner wall of the lower end of the through hole.

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