Natural gas wellhead filtering and sampling device

Abstract

The utility model discloses a natural gas wellhead filtering and sampling device which comprises a cylinder body, the lower end of the cylinder body is sealed, the upper end of the cylinder body is provided with an opening, a flange cover is detachably arranged at the upper end of the cylinder body, and an inlet pipe, an output pipe and a sampling pipe are arranged on the side wall of the cylinder body; a filter screen is arranged on the inner side of the cylinder body and divides the cylinder body 1 into a dirt collection chamber and a liquid sample storage chamber, the sampling pipe is communicated with the liquid sample storage chamber, and the dirt collection chamber is adjacent to the inlet pipe; the device can be installed at a wellhead where a gas-liquid separator cannot be installed, liquid sampling is achieved on the premise that gas circulation is not affected, the mode of collecting liquid samples through loss of natural gas is changed, sampling cost is reduced, and meanwhile pollution of hydrogen sulfide natural gas to the environment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid sampling in oil and gas fields, in particular to a natural gas wellhead filtering sampling device. Background Art

[0002] Natural gas liquid sampling is one of the important means to understand the production status of gas wells during gas field development. The physical and chemical properties of liquid samples are used to determine the formation water production and gas well liquid conditions, providing a basis for gas well parameter adjustment.

[0003] At present, there are two methods for taking liquid samples from natural gas wellheads. One is to take samples with the help of a gas-liquid separator at the wellhead; the other is to take liquid samples by exhausting gas at the wellhead. Sampling with a gas-liquid separator at the wellhead is to take liquid samples from the gas-liquid separator drainage pipe. Due to the limitations of wellhead equipment, liquid samples cannot be taken from natural gas wellheads that are not equipped with a gas-liquid separator by this method. Taking liquid samples by exhausting gas at the wellhead is to lead a portion of the natural gas at the wellhead through a conduit into a sampling container, with the liquid retained in the sampling container and the gas discharged. This method of taking liquid samples results in natural gas loss and is not suitable for taking liquid samples from natural gas containing hydrogen sulfide.

[0004] Although there are filtering devices on the market, for example, a Chinese patent with patent publication number CN218444641U discloses a chemical filtering sampling pipeline, which is suitable for filtering and sampling operations of liquid fluids, but is difficult to complete liquid sampling operations of gas-liquid mixed fluids; another example is a Chinese patent with patent publication number CN208795537U discloses an on-site closed filtering sampling device, whose cylinder body does not have the function of storing and discharging sewage, and is used for sampling at the natural gas wellhead, which may cause the upper and lower cavity sieve plate filter membranes to be blocked, and the device does not have the function of storing liquid, and the operation time required for liquid sampling in an environment with relatively low water vapor is relatively long. Utility Model Content

[0005] The utility model aims to provide a natural gas wellhead filtering sampling device, aiming to improve the problem of natural gas loss when taking liquid samples at a wellhead where a gas-liquid separator is not installed.

[0006] The utility model is implemented as follows: a natural gas wellhead filtering sampling device comprises a cylinder, the lower end of the cylinder is sealed, the upper end is set to be open, a flange cover is detachably provided at the upper end of the cylinder, an inlet pipe, an outlet pipe and a sampling pipe are provided on the side wall of the cylinder; a filter screen is provided on the inner side of the cylinder, the filter screen divides the cylinder 1 to form a dirt collecting chamber and a liquid sample retention chamber, the sampling tube is communicated with the liquid sample retention chamber, and the dirt collecting chamber is adjacent to the inlet pipe.

[0007] Preferably, the filter screen is configured as an S-shaped structure, a plurality of filter holes are provided at the upper end of the filter screen, and the upper and lower ends of the filter screen are respectively in sealing contact with the bottom of the cylinder and the bottom surface of the flange cover.

[0008] Preferably, a baffle is provided on the side of the filter screen, and the baffle is provided below the inlet pipe and the outlet pipe.

[0009] Preferably, the baffle is located in the liquid sample retention chamber and divides the liquid sample retention chamber into an upper space and a lower space, and the sampling tube is connected to the bottom of the lower space.

[0010] Preferably, a bracket is arranged outside the filter screen, the bracket includes two vertical plates and two ring plates, the two ring plates are respectively arranged at the upper and lower ends of the two vertical plates; the upper and lower ends of the bracket are respectively in sealing contact with the bottom of the cylinder and the bottom surface of the flange cover.

[0011] Preferably, the two ends of the filter screen are respectively sealed and fixedly connected to the two vertical plates, and sealing layers are provided on the outer sides of the vertical plates and the annular plates, and the sealing layers are in contact with the side walls of the cylinder.

[0012] Preferably, a plurality of bolts are provided through the edge of the flange cover, and the lower ends of the bolts pass through the flange provided at the top of the cylinder body.

[0013] Preferably, a flange is provided on the top of the cylinder, a convex plate is fixedly provided on the side of the flange, a screw is fixedly provided on the convex plate, a pressure plate is sleeved on the screw and a nut is sleeved on the threaded sleeve, an insertion rod is provided on the edge of the lower side of the flange cover, the insertion rod is inserted into the hole of the flange, and the pressure plate presses down the edge of the flange cover.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model can be installed at the wellhead where the gas-liquid separator cannot be installed, so that liquid sampling can be achieved without affecting the gas circulation, changing the method of collecting liquid samples by wasting natural gas, reducing the sampling cost, and avoiding the pollution of hydrogen sulfide natural gas to the environment.

[0016] 2. The utility model is provided with a filter screen to divide the cylinder into a dirt collecting chamber and a liquid sample retention chamber, so as to achieve solid-liquid separation and prevent impurities from flowing with the liquid and causing blockage of the sampling tube. At the same time, with the cooperation of the baffle, the liquid volume is stored in the liquid sample retention chamber to prevent gas circulation from causing liquid to be output from the liquid sample retention chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the first three-dimensional structure of an embodiment of the utility model;

[0018] Figure 2 This utility model Figure 1 A schematic diagram of the three-dimensional structure of the middle cylinder;

[0019] Figure 3 This utility model Figure 1 Schematic diagram of the three-dimensional structure of the middle filter;

[0020] Figure 4 This utility model Figure 3 A schematic diagram of the three-dimensional structure of the middle bracket;

[0021] Figure 5 It is a schematic diagram of the second three-dimensional structure of an embodiment of the utility model.

[0022] In the figure: 1, cylinder; 11, sampling tube; 12, inlet tube; 13, outlet tube; 14, convex plate; 15, pressure plate; 2, flange cover; 21, plug rod; 3, filter screen; 31, filter hole; 32, baffle; 4, bracket; 41, vertical plate; 42, ring plate; 43, sealing layer. DETAILED DESCRIPTION

[0023] 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.

[0024] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0025] Example 1

[0026] like Figure 1 , Figure 2 , Figure 3As shown, a natural gas wellhead filtering sampling device comprises a cylinder 1, a filter screen 3 and a bracket 4. The lower end of the cylinder 1 is sealed, and the upper end is set to be open. A flange cover 2 is detachably set at the upper end of the cylinder 1. The flange cover 2 is sealed and set at the upper end of the cylinder 1 so as to cooperate with the cylinder 1 to form a space for liquid and gas circulation and liquid retention. An inlet pipe 12, an outlet pipe 13 and a sampling tube 11 are set on the side wall of the cylinder 1. The inlet pipe 12 and the outlet pipe 13 are connected to the gas delivery pipeline so that the device is connected to the gas delivery pipeline. The sampling tube 11 can be opened to achieve gas and liquid sampling. The filter screen 3 is set to an S-shaped structure, the bracket 4 is set on the outside of the filter screen 3, the filter screen 3 and the bracket 4 are set in the space formed by the cylinder 1 and the flange cover 2, and a plurality of filter holes 31 are set at the upper end of the filter screen 3. The filter screen 3 divides the cylinder 1 to form a dirt collection chamber and a liquid sample retention chamber, and the sampling tube 11 is connected to the liquid sample retention chamber. During the gas circulation process, it first flows into the dirt collection chamber through the inlet pipe 12. The fixed substances are retained in the dirt collection chamber under the action of gravity and the filter 3. When the liquid level in the dirt collection chamber rises to the lower end of the filter hole 31, the liquid passes through the filter hole 31 and flows into the liquid sample retention chamber and accumulates. Because the sampling tube 11 is connected to the liquid sample retention chamber, the liquid can be sampled by rotating the valve of the sampling tube 11. During the liquid sampling process, if the sound of airflow is heard, the sampling tube 11 can be closed to complete the liquid sampling work. If gas sampling is required, the gas sampling work can be carried out when the sound of airflow is heard during the process of discharging the liquid.

[0027] like Figure 3 As shown, in order to prevent the liquid from escaping from the liquid sample retention chamber during the gas circulation process, a baffle 32 is provided on the side of the filter screen 3. The baffle 32 is provided below the inlet pipe 12 and the outlet pipe 13, and is located above the lower end of the filter hole 31. The baffle 32 is located in the liquid sample retention chamber and divides the liquid sample retention chamber into an upper space and a lower space. The sampling tube 11 is connected to the bottom of the lower space. Under the action of the baffle 32, the channel for the liquid to be output from the upper end of the liquid sample retention chamber is blocked, effectively avoiding the effect of gas on the liquid.

[0028] like Figure 4As shown, in order to achieve stable installation of the filter 3 in the cylinder 1, the bracket 4 includes two vertical plates 41 and two ring plates 42, and the two ring plates 42 are respectively arranged at the upper and lower ends of the two vertical plates 41, and the two ends of the filter 3 are respectively sealed and fixedly connected to the two vertical plates 41, and sealing layers 43 are arranged on the outer sides of the vertical plates 41 and the ring plates 42, and the sealing layer 43 contacts the side wall of the cylinder 1. Since the sealing layers 43 are arranged on the outer sides of the vertical plates 41 and the ring plates 42, and the filter 3 is sealed and fixedly connected to the vertical plates 41, the filter 3 can effectively divide the cylinder 1 to prevent impurities from entering the liquid sample retention chamber through the gap between the filter 3 and the cylinder 1. The upper and lower ends of the filter screen 3 and the bracket 4 are in sealing contact with the bottom of the cylinder 1 and the bottom surface of the flange cover 2, respectively, that is, a sealing layer 43 is provided between the filter screen 3 and the bracket 4 and the bottom of the cylinder 1 and the flange cover 2. Due to the existence of the sealing layer 43, the filter screen 3 is sealed with the cylinder 1 and the flange cover 2, and the resistance of the filter screen 3 to the rotation of the cylinder 1 is increased, so that the filter screen 3 is stably placed relative to the cylinder 1, and the state of the filter screen 3 is prevented from changing due to gas circulation. If necessary, the bracket 4 and the cylinder 1 can also be connected by bolts.

[0029] like Figure 1 As shown, in order to achieve the detachable connection of the flange cover 2, multiple bolts can be set through the edge of the flange cover 2, and the lower ends of the bolts penetrate the flange setting at the top of the cylinder 1. This setting makes it easy for the staff to disassemble the flange cover 2 and clean the impurities in the cylinder 1.

[0030] Example 2

[0031] like Figure 1 , Figure 2 , Figure 3As shown, a natural gas wellhead filtering sampling device comprises a cylinder 1, a filter screen 3 and a bracket 4. The lower end of the cylinder 1 is sealed, and the upper end is set to be open. A flange cover 2 is detachably set at the upper end of the cylinder 1. The flange cover 2 is sealed and set at the upper end of the cylinder 1 so as to cooperate with the cylinder 1 to form a space for liquid and gas circulation and liquid retention. An inlet pipe 12, an outlet pipe 13 and a sampling tube 11 are set on the side wall of the cylinder 1. The inlet pipe 12 and the outlet pipe 13 are connected to the gas delivery pipeline so that the device is connected to the gas delivery pipeline. The sampling tube 11 can be opened to achieve gas and liquid sampling. The filter screen 3 is set to an S-shaped structure, the bracket 4 is set on the outside of the filter screen 3, the filter screen 3 and the bracket 4 are set in the space formed by the cylinder 1 and the flange cover 2, and a plurality of filter holes 31 are set at the upper end of the filter screen 3. The filter screen 3 divides the cylinder 1 to form a dirt collection chamber and a liquid sample retention chamber, and the sampling tube 11 is connected to the liquid sample retention chamber. During the gas circulation process, it first flows into the dirt collection chamber through the inlet pipe 12. The fixed substances are retained in the dirt collection chamber under the action of gravity and the filter 3. When the liquid level in the dirt collection chamber rises to the lower end of the filter hole 31, the liquid passes through the filter hole 31 and flows into the liquid sample retention chamber and accumulates. Because the sampling tube 11 is connected to the liquid sample retention chamber, the liquid can be sampled by rotating the valve of the sampling tube 11. During the liquid sampling process, if the sound of airflow is heard, the sampling tube 11 can be closed to complete the liquid sampling work. If gas sampling is required, the gas sampling work can be carried out when the sound of airflow is heard during the process of discharging the liquid.

[0032] like Figure 3 As shown, in order to prevent the liquid from escaping from the liquid sample retention chamber during the gas circulation process, a baffle 32 is provided on the side of the filter screen 3. The baffle 32 is provided below the inlet pipe 12 and the outlet pipe 13, and is located above the lower end of the filter hole 31. The baffle 32 is located in the liquid sample retention chamber and divides the liquid sample retention chamber into an upper space and a lower space. The sampling tube 11 is connected to the bottom of the lower space. Under the action of the baffle 32, the channel for the liquid to be output from the upper end of the liquid sample retention chamber is blocked, effectively avoiding the effect of gas on the liquid.

[0033] like Figure 4As shown, in order to achieve stable installation of the filter 3 in the cylinder 1, the bracket 4 includes two vertical plates 41 and two ring plates 42, and the two ring plates 42 are respectively arranged at the upper and lower ends of the two vertical plates 41, and the two ends of the filter 3 are respectively sealed and fixedly connected to the two vertical plates 41, and sealing layers 43 are arranged on the outer sides of the vertical plates 41 and the ring plates 42, and the sealing layer 43 contacts the side wall of the cylinder 1. Since the sealing layers 43 are arranged on the outer sides of the vertical plates 41 and the ring plates 42, and the filter 3 is sealed and fixedly connected to the vertical plates 41, the filter 3 can effectively divide the cylinder 1 to prevent impurities from entering the liquid sample retention chamber through the gap between the filter 3 and the cylinder 1. The upper and lower ends of the filter screen 3 and the bracket 4 are in sealing contact with the bottom of the cylinder 1 and the bottom surface of the flange cover 2, respectively, that is, a sealing layer 43 is provided between the filter screen 3 and the bracket 4 and the bottom of the cylinder 1 and the flange cover 2. Due to the existence of the sealing layer 43, the filter screen 3 is sealed with the cylinder 1 and the flange cover 2, and the resistance of the filter screen 3 to the rotation of the cylinder 1 is increased, so that the filter screen 3 is stably placed relative to the cylinder 1, and the state of the filter screen 3 is prevented from changing due to gas circulation. If necessary, the bracket 4 and the cylinder 1 can also be connected by bolts.

[0034] like Figure 4 As shown, in order to realize the detachable connection of the flange cover 2, a flange is provided on the top of the cylinder 1, a convex plate 14 is fixedly provided on the side of the flange, a screw is fixedly provided on the convex plate 14, a pressing plate 15 and a nut are sleeved on the screw, an insertion rod 21 is provided on the edge of the lower side of the flange cover 2, the insertion rod 21 is inserted into the hole of the flange, and the pressing plate 15 presses down the edge of the flange cover 2, and the position of the flange cover 2 relative to the cylinder 1 is limited under the cooperation of the insertion rod 21 and the hole of the flange. In addition, under the action of the nut, the pressing plate 15 is forced to press down the flange cover 2, so that the flange cover 2 is stably installed relative to the cylinder 1. When the flange cover 2 needs to be removed, the nut can be rotated to loosen the pressing plate 15, and the loosened pressing plate 15 can be rotated to separate it from the flange cover 2, and the removal of the flange cover 2 can be completed.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A natural gas wellhead filtration sampling device, characterized in that: The invention comprises a cylinder (1), wherein the lower end of the cylinder (1) is sealed and the upper end is arranged to be open, a flange cover (2) is detachably arranged at the upper end of the cylinder (1), an inlet pipe (12), an outlet pipe (13) and a sampling tube (11) are arranged on the side wall of the cylinder (1); a filter screen (3) is arranged on the inner side of the cylinder (1), the filter screen (3) divides the cylinder (1) into a dirt collection chamber and a liquid sample retention chamber, the sampling tube (11) is communicated with the liquid sample retention chamber, and the dirt collection chamber is adjacent to the inlet pipe (12).

2. A natural gas wellhead filtration sampling device according to claim 1, characterized in that: The filter screen (3) is arranged in an S-shaped structure, a plurality of filter holes (31) are arranged at the upper end of the filter screen (3), and the upper and lower ends of the filter screen (3) are respectively in sealing contact with the bottom of the cylinder (1) and the bottom surface of the flange cover (2).

3. A natural gas wellhead filtration sampling device according to claim 2, characterized in that: A baffle (32) is arranged on the side of the filter screen (3), and the baffle (32) is arranged below the inlet pipe (12) and the outlet pipe (13).

4. A natural gas wellhead filtration sampling device according to claim 3, characterized in that: The baffle (32) is located in the liquid sample storage chamber and divides the liquid sample storage chamber into an upper space and a lower space, and the sampling tube (11) is connected to the bottom of the lower space.

5. A natural gas wellhead filtration sampling device according to claim 2, characterized in that: A bracket (4) is arranged on the outside of the filter screen (3), and the bracket (4) comprises two vertical plates (41) and two ring plates (42). The two ring plates (42) are respectively arranged at the upper and lower ends of the two vertical plates (41); the upper and lower ends of the bracket (4) are respectively in sealing contact with the bottom of the cylinder (1) and the bottom surface of the flange cover (2).

6. A natural gas wellhead filtration sampling device according to claim 5, characterized in that: The two ends of the filter screen (3) are respectively sealed and fixedly connected to two vertical plates (41), and sealing layers (43) are provided on the outer sides of the vertical plates (41) and the ring plates (42), and the sealing layers (43) are in contact with the side walls of the cylinder (1).

7. A natural gas wellhead filtration sampling device according to claim 1, characterized in that: A plurality of bolts are provided through the edge of the flange cover (2), and the lower ends of the bolts pass through the flange provided at the top of the cylinder (1).

8. A natural gas wellhead filtration sampling device according to claim 1, characterized in that: A flange is arranged on the top of the cylinder (1), a convex plate (14) is fixedly arranged on the side of the flange, a screw is fixedly arranged on the convex plate (14), a pressure plate (15) is sleeved on the screw and a nut is sleeved on the thread, an insertion rod (21) is arranged on the edge of the lower side of the flange cover (2), the insertion rod (21) is inserted into the hole of the flange, and the pressure plate (15) presses down the edge of the flange cover (2).

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