Self-heating oil well sampling valve

Abstract

A self-heating oil well sampling valve belongs to the technical field of sampling valves. The utility model solves the problems that the sampling port of the sampling valve is usually frozen under the influence of low temperature in northern winter, the efficiency is low by adopting a hot water melting method, and the sampling valve is easily damaged by adopting a tool knocking method. A sampling valve body is communicated with a sampling pipe, a sampling valve plug is connected with the sampling pipe in a matched mode to plug an outlet of the sampling pipe, a heat preservation sleeve is wrapped outside the sampling pipe, the sampling valve plug comprises a valve plug shell, a valve plug electric heating layer and a second power connection wire, and the valve plug electric heating layer is arranged in the valve plug shell. The valve plug electric heating layer is connected with a second power connection wire, and the second power connection wire penetrates through the valve plug shell and is arranged on the outer side of the valve plug shell. According to the self-heating oil well sampling valve, the internal structure of the sampling valve is improved, an electric heating mode is adopted, the flowability of accumulated oil is improved, and the sampling efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sampling valves, in particular to a self-heating oil well sampling valve. Background Art

[0002] Oil well sampling is the main content of daily oil well work. The oil well output fluid is sampled and analyzed to understand the various indicators of the output fluid, such as water content, sand content, wax deposition, viscosity, etc., and to grasp the dynamic change data of the oil well in order to maintain the normal production of the oil well.

[0003] Sampling is achieved through a sampling valve. Currently, the most common sampling valve is installed on the ground oil pipeline at the outlet of the oil well, which is convenient for sampling and analysis at the wellhead at any time. The oil enters the inlet of the sampling valve from the oil pipeline, flows into the sampling port of the sampling valve along a certain path, and forms a sampling oil circuit of a certain distance. Some sampling oil circuits are designed to be curved, and after each sampling, oil will remain inside the sampling oil circuit. Therefore, each time sampling is performed, the residual oil remaining in the sampling oil circuit from the previous sampling must be drained, and sampling can only be started when fresh oil is seen flowing out. However, crude oil has a high freezing point, high wax content, high viscosity, and large flow resistance at room temperature. Especially in winter, crude oil will solidify or freeze at the sampling oil circuit and the sampling port of the sampling valve, making the sampling port unable to be opened. Therefore, at each sampling, the current existing solution is to heat the sampling port, heat the wellhead, or hold the pressure at the wellhead. For example, hot water can be used to melt the solidified and frozen residual oil before sampling. This operation is very troublesome. In the winter in the north, water freezes. It is very inconvenient to operate in the field. In addition, according to the operating rules, the sampling port cannot be heated by baking with an open flame. In addition, the frozen valve is hit with a sledgehammer, which causes the sampling valve to break.

[0004] Therefore, the present application proposes a self-heating oil well sampling valve to solve the above problems. Utility Model Content

[0005] The purpose of the research and development of the utility model is to solve the problem that in the winter in the north, the sampling port of the sampling valve is usually frozen due to the low temperature, the method of melting with hot water is inefficient, and the sampling valve is easily damaged by knocking with tools. A brief overview of the utility model is given below to provide a basic understanding of certain aspects of the utility model. It should be understood that this overview is not an exhaustive overview of the utility model. It is not intended to determine the key or important parts of the utility model, nor is it intended to limit the scope of the utility model.

[0006] The technical solution of this utility model:

[0007] A self-heating oil well sampling valve comprises a sampling valve body, a sampling tube, a sampling valve plug and a thermal insulation sleeve. The sampling valve body is connected to the sampling tube, the sampling valve plug cooperates with the sampling tube to seal the outlet of the sampling tube, the outside of the sampling tube is wrapped with a thermal insulation sleeve, the sampling valve plug comprises a valve plug shell, a valve plug electric heating layer and a second power connection wire, the valve plug shell is provided with a valve plug electric heating layer, the valve plug electric heating layer is connected to the second power connection wire, and the second power connection wire passes through the valve plug shell and is arranged outside the valve plug shell.

[0008] Furthermore, a valve plug heat-conducting insulation layer is provided on the inner side of the valve plug shell, and the valve plug heat-conducting insulation layer is arranged between the valve plug electric heating layer and the valve plug shell.

[0009] Furthermore, the sampling tube includes a sampling tube outer shell, a sampling tube heating layer and a sampling tube inner shell. A cavity is provided between the sampling tube outer shell and the sampling tube inner shell. The sampling tube heating layer is arranged in the cavity. A first power connection wire is connected to the sampling tube heating layer. The first power connection wire passes through the sampling tube outer shell and is arranged on the outside of the sampling tube outer shell.

[0010] Furthermore, a sampling tube insulation layer is provided between the sampling tube outer shell and the sampling tube inner shell, and the sampling tube insulation layer is wrapped around the outer side of the sampling tube heating layer.

[0011] Furthermore, the inner shell of the sampling tube is processed with internal threads, the outer shell of the valve plug is processed with external threads, and the outer shell of the valve plug and the inner shell of the sampling tube are connected by threads.

[0012] Furthermore, the thermal insulation sleeve includes an outer layer, an inner layer and a heating layer. The heating layer is arranged between the outer layer and the inner layer. The inner layer is cooperatively connected to the outer wall of the sampling tube. A power cord is connected to the heating layer. An insulation layer is also arranged between the heating layer and the outer layer.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model is a self-heating oil well sampling valve. By improving the internal structure of the sampling valve, a valve plug electric heating layer is set in the valve plug used for sealing the outlet of the sampling tube. The valve plug electric heating layer is heated by connecting an external power supply through a second power connecting wire. By increasing the temperature of the valve plug itself, the temperature at the sampling tube mouth is increased to melt the accumulated oil at the sampling tube mouth, and then the accumulated oil at the sampling tube mouth is discharged, and the new oil is sampled and analyzed. The improvement of the sampling valve plug does not require the replacement of the original sampling valve, and only needs to configure and process a matching sampling valve plug according to the inner wall size of the original sampling tube.

[0015] 2. The utility model provides a self-heating oil well sampling valve. In addition to modifying the sampling valve plug, a sampling tube heating layer is designed in the structure of the sampling tube. The sampling tube heating layer is energized and heated by a first electrical conductor. With the synchronous heating of the sampling tube and the sampling valve plug, the overall temperature of the pipeline is increased more quickly, thereby improving the crude oil sampling efficiency.

[0016] 3. A self-heating oil well sampling valve of the utility model is also connected to an insulation sleeve on the outside of the sampling tube. The insulation layer of the insulation sleeve can slow down the temperature loss at the sampling tube. In addition, a heating layer is arranged inside the insulation sleeve, and the heating layer is also heated by a power cord. When the sampling valve is blocked and the sampling tube and the insulation sleeve are heated at the same time, the temperature at the outlet of the sampling tube is rapidly increased, thereby accelerating the sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a self-heating oil well sampling valve;

[0018] Figure 2 is a longitudinal cross-sectional view of the sampling valve plug;

[0019] Figure 3 is a cross-sectional view of the sampling valve plug;

[0020] Figure 4 is a schematic diagram of a thermal insulation sleeve;

[0021] Figure 5 is a longitudinal cross-sectional view of the sampling tube;

[0022] Figure 6 It is a cross-sectional view of the sampling tube.

[0023] In the figure, 1-sampling valve body, 2-sampling tube, 3-sampling valve plug, 4-insulation sleeve, 21-sampling tube outer shell, 22-sampling tube heating layer, 23-sampling tube inner shell, 24-sampling tube insulation layer, 25-first power connecting wire, 31-valve plug outer shell, 32-valve plug electric heating layer, 33-valve plug heat-conducting insulation layer, 34-second power connecting wire, 41-outer layer, 42-inner layer, 43-insulation layer, 44-heating layer, 45-power cord. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described below by specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0025] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection, and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection, and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment 1, combination Figure 1-Figure 6 The present embodiment is described. A self-heating oil well sampling valve of the present embodiment includes a sampling valve body 1, a sampling tube 2, a sampling valve plug 3 and a thermal insulation sleeve 4. The sampling valve body 1 is connected to the sampling tube 2. The sampling valve plug 3 cooperates with the sampling tube 2 to seal the outlet of the sampling tube 2. The outside of the sampling tube 2 is wrapped with the thermal insulation sleeve 4. The sampling valve plug 3 includes a valve plug shell 31, a valve plug electric heating layer 32 and a second power connection wire 34. The valve plug shell 31 is provided with a valve plug electric heating layer 32. The valve plug electric heating layer 32 is connected to the second power connection wire 34. The second power connection wire 34 passes through the valve plug shell 31 and is arranged on the outside of the valve plug shell 31.

[0028] When the accumulated oil at the mouth of the sampling tube 2 solidifies or has poor fluidity due to the low temperature, before sampling, the second power lead 34 is connected to an external power source, and electric heating is used to increase the temperature of the valve plug electric heating layer 32. A valve plug thermal insulation layer 33 is provided on the outer side of the valve plug electric heating layer 32. The valve plug thermal insulation layer 33 is a thermally conductive adhesive with good thermal conductivity and insulation effect. Under the action of the thermally conductive adhesive, the risk of leakage is avoided and the transfer effect of the valve plug electric heating layer 32 after the temperature is increased is improved.

[0029] There is a cavity between the sampling tube outer shell 21 and the sampling tube inner shell 23 of the sampling tube 2, and a sampling tube heating layer 22 is provided in the cavity. The outer side of the sampling tube heating layer 22 is also wrapped with a sampling tube insulation layer 24. The sampling tube insulation layer 24 and the valve plug thermal insulation layer 33 are made of the same material, both of which are thermal conductive glue, which improves the thermal conductivity while also having electrical insulation properties. A first power connection wire 25 is connected to the sampling tube heating layer 22, and the first power connection wire 25 passes through the sampling tube insulation layer 24 and the sampling tube outer shell 21 to be connected to an external power source, and the temperature of the sampling tube heating layer 22 is increased by electric heating. An internal thread is processed on the sampling tube inner shell 23, and an external thread is processed on the valve plug outer shell 31. The sampling valve plug 3 is connected to the internal thread of the sampling tube inner shell 23 through the external thread of the valve plug outer shell 31. The sampling tube 2 is connected to the sampling valve body 1 by welding. With this arrangement, based on the existing sampling valve, the original sampling tube can be removed and the sampling tube 2 can be welded to the sampling valve body 1, thus saving modification costs.

[0030] In order to improve the temperature raising efficiency and heat preservation effect of the sampling tube 2, a heat preservation sleeve 4 is installed on the outer side of the sampling tube 2. The heat preservation sleeve 4 includes an outer layer 41 and an inner layer 42. A heating layer 44 is arranged between the outer layer 41 and the inner layer 42. A power line 45 is connected to the heating layer 44. The power line 45 is connected to an external power supply. The temperature of the heating layer 44 is raised by electric heating. A heat preservation layer 43 is arranged between the heating layer 44 and the outer layer 41. The heat preservation layer 43 is made of mineral wool. The heat preservation layer 43 prevents the temperature of the sampling tube 2 from dissipating too quickly. Under the simultaneous action of the heating layer 44, the sampling tube heating layer 22 and the valve plug electric heating layer 32, the temperature at the sampling tube 2 is rapidly raised, the accumulated oil condensed at the outlet of the sampling tube 2 is melted, and the fluidity of the accumulated oil is improved. After heating for a certain period of time, the sampling valve plug 3 is screwed out of the sampling tube 2, and the accumulated oil is drained before sampling the crude oil.

[0031] This embodiment is only an illustrative description of the present application and does not limit its protection scope. Those skilled in the art may also make partial changes thereto, and as long as they do not exceed the spirit of the present application, they are all within the protection scope of the present application.

Claims

1. A self-heating oil well sampling valve, characterized in that: The invention comprises a sampling valve body (1), a sampling tube (2), a sampling valve plug (3) and a heat-insulating sleeve (4); the sampling valve body (1) is connected to the sampling tube (2); the sampling valve plug (3) is connected to the sampling tube (2) to seal the outlet of the sampling tube (2); the outside of the sampling tube (2) is wrapped with a heat-insulating sleeve (4); the sampling valve plug (3) comprises a valve plug shell (31), a valve plug electric heating layer (32) and a second power connection wire (34); the valve plug shell (31) is provided with a valve plug electric heating layer (32); the valve plug electric heating layer (32) is connected to the second power connection wire (34); the second power connection wire (34) passes through the valve plug shell (31) and is arranged outside the valve plug shell (31).

2. A self-heating oil well sampling valve according to claim 1, characterized in that: A valve plug heat-conducting insulating layer (33) is provided on the inner side of the valve plug shell (31), and the valve plug heat-conducting insulating layer (33) is arranged between the valve plug electric heating layer (32) and the valve plug shell (31).

3. A self-heating oil well sampling valve according to claim 1, characterized in that: The sampling tube (2) comprises a sampling tube outer shell (21), a sampling tube heating layer (22) and a sampling tube inner shell (23); a cavity is provided between the sampling tube outer shell (21) and the sampling tube inner shell (23); the sampling tube heating layer (22) is arranged in the cavity; a first power connection wire (25) is connected to the sampling tube heating layer (22); the first power connection wire (25) passes through the sampling tube outer shell (21) and is arranged outside the sampling tube outer shell (21).

4. A self-heating oil well sampling valve according to claim 3, characterized in that: A sampling tube insulation layer (24) is also provided between the sampling tube outer shell (21) and the sampling tube inner shell (23), and the sampling tube insulation layer (24) is wrapped around the outside of the sampling tube heating layer (22).

5. A self-heating oil well sampling valve according to claim 4, characterized in that: The sampling tube inner shell (23) is processed with an internal thread, the valve plug outer shell (31) is processed with an external thread, and the valve plug outer shell (31) and the sampling tube inner shell (23) are connected by threads.

6. The self-heating oil well sampling valve according to claim 1, characterized in that: The heat-insulating sleeve (4) comprises an outer layer (41), an inner layer (42) and a heating layer (44); the heating layer (44) is arranged between the outer layer (41) and the inner layer (42); the inner layer (42) is cooperatively connected to the outer wall of the sampling tube (2); a power line (45) is connected to the heating layer (44); and a heat-insulating layer (43) is further arranged between the heating layer (44) and the outer layer (41).

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