A skid-mounted gas field wellhead gas-solid two-phase flow measurement device

Abstract

This invention discloses a skid-mounted gas-solid two-phase flow measurement device for gas field wellheads, relating to the field of two-phase flow measurement technology. It includes: a pressure-distributing debris-collecting mechanism with multiple pressure-distributing pipes connected in parallel, each pipe connected in series with a throttle valve and a debris collector; a metering inlet pipe for connecting to the wellhead; a sand removal mechanism with a first diverter pipe connected to the outlet of the pressure-distributing debris-collecting mechanism, and a first sand remover connected in series with the first diverter pipe; a cooling metering mechanism with a cooling pipe connected in series with a heat exchanger, a separator, and a flow meter, the inlet of the cooling pipe connected to the outlet of the first diverter pipe; and a sand collection mechanism with a sand collection tank, the inlet of which is connected to the debris discharge end of the debris collector, the sand discharge end of the first sand remover, and the solid discharge end of the separator. This invention can accurately measure the gas-solid two-phase flow rate at the wellhead.

Description

Technical Field

[0001] This invention relates to the field of two-phase flow measurement technology, specifically to a skid-mounted gas field wellhead gas-solid two-phase flow measurement device. Background Technology

[0002] Natural gas is a colorless, low-carbon mixture rich in alkanes. Its primary use is as fuel, and it can be used to manufacture carbon black, chemicals, and liquefied petroleum gas. Propane and butane produced from natural gas are important raw materials for modern industry. As a transitional energy source between traditional fossil fuels and green energy sources such as hydrogen, wind, and nuclear power, natural gas will play a crucial role in industrial development over the next few decades.

[0003] Natural gas, found in underground strata, is a mixture of gases, primarily hydrocarbons but also containing non-hydrocarbon compounds. After extracting gas from a natural gas reservoir, it is necessary to further measure the total amount extracted to verify the actual production volume of single wells, multiple wells, and entire blocks. The resulting measurement values ​​are crucial indicators for industrial processes such as natural gas transfer, trading, and storage, directly determining the technical implementation plans and trade fairness of each subsequent industrial stage. Furthermore, accurate wellhead measurement is a necessary prerequisite for the safe extraction, transportation, and storage of natural gas in Southwest my country, and a key trade benchmark for transactions with downstream gas companies.

[0004] However, the main natural gas producing areas in the Sichuan Basin face "three-high" field conditions during extraction: ultra-high pressure, high temperature, and high sulfur content. When extracting natural gas from sandstone reservoirs and deeper reservoirs, fracturing technology is often used. During fracturing, in addition to artificially adding sand particles to fracture the reservoir, sand particles and elemental sulfur from the original reservoir are also carried out of the wellhead by the high-pressure gas flow. This results in the wellhead producing not pure gaseous natural gas, but a gas-solid two-phase medium mixed with sand particles and elemental sulfur. Current conventional natural gas development and production sites use desanders and standard orifice flow meters to measure the gas produced at the wellhead for gas-solid two-phase fluids. However, the operating conditions at the wellhead of the ultra-high pressure, high temperature, and high sulfur content gas fields in the Sichuan Basin differ significantly from those of conventional medium- and low-pressure gas fields, leading to lower measurement accuracy. Therefore, existing single-phase metering devices cannot accurately measure the flow rate of the gas-solid two-phase flow at the gas field wellhead. Summary of the Invention

[0005] To address the technical problem that single-phase metering devices cannot accurately measure the flow rate of gas-solid two-phase flow at gas field wellheads, this invention provides a skid-mounted gas-solid two-phase flow measurement device for gas field wellheads. This device can reduce the impact of ultra-high pressure and high temperature gas-solid two-phase flow on sensor measurements, thereby enabling accurate measurement.

[0006] This invention is achieved through the following technical solution:

[0007] This invention provides a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, comprising: a pressure-distributing debris-collecting mechanism, wherein multiple pressure-distributing pipes are connected in parallel, each pressure-distributing pipe being sequentially connected to a throttle valve and a debris collector, and the inlet end of each pressure-distributing pipe being used to connect to a metering inlet pipe, the metering inlet pipe being used to connect to the wellhead; a sand removal mechanism, wherein a first diverter pipe is provided, the first diverter pipe being connected to the outlet end of the pressure-distributing debris-collecting mechanism, and the first diverter pipe being connected in series to a first sand remover; a cooling metering mechanism, wherein a cooling pipe is provided, the cooling pipe being sequentially connected to a heat exchanger, a separator, and a flow meter, the inlet end of the cooling pipe being connected to the outlet end of the first diverter pipe; and a sand collection mechanism, wherein a sand collection tank is provided, the inlet of the sand collection tank being connected to the debris discharge end of the debris collector, the sand discharge end of the first sand remover, and the solid discharge end of the separator, respectively.

[0008] The skid-mounted gas-solid two-phase flow measurement device at the wellhead of this invention features a pressure-distributing and debris-collecting mechanism. Each pressure-distributing pipe is sequentially connected in series with a throttle valve and a debris collector. The throttle valve reduces the pressure of the introduced gas-solid two-phase flow at the wellhead, while the debris collector performs preliminary separation of gas and solid impurities in the flow. Multiple pressure-distributing pipes are connected in parallel to divert the gas-solid two-phase flow, reducing pressure fluctuations and impact on the debris collector, and adjusting the pressure to a range that the flow meter can withstand. Simultaneously, a sand removal mechanism... The first diversion pipe is equipped with a first desander, which is connected to a pressure-distributing debris-collecting mechanism for further desandering. The cooling metering mechanism has a cooling pipe connected in series with a heat exchanger, a separator, and a flow meter. The heat exchanger cools the gas-solid two-phase flow at the wellhead after further desandering, adjusting its temperature to a range that the flow meter can handle. The separator then separates the cooled gas-solid two-phase flow into solid and gas phases, with the gas being fed into the flow meter for flow rate measurement. Additionally, the inlet of the sand collection tank is connected to the debris discharge end of the debris collector, the sand discharge end of the first desander, and the solid discharge end of the separator, allowing for centralized processing of solid debris separated from the gas-solid two-phase flow at the gas field wellhead.

[0009] Therefore, the skid-mounted gas-solid two-phase flow measurement device at the gas field wellhead provided by this invention can perform pressure reduction and temperature reduction on the gas-solid two-phase flow at the gas field wellhead, and simultaneously perform three-stage two-phase separation through a debris collector, a sand remover, and a separator. This removes impurities from the gas-solid two-phase flow at the gas field wellhead, reduces the pressure and temperature of the gas flow to within the measurement conditions of the flow meter, thereby avoiding pipe bursts, burns to personnel, and erosion of the flow meter, and achieving safe and efficient measurement of the gas-solid two-phase flow at the gas field wellhead.

[0010] In an optional embodiment, the pressure divider tube is equipped with a first pressure gauge and a first thermometer to facilitate the detection of the pressure and temperature of the two-phase flow within each pressure divider tube, providing data support for adjusting the throttle valve and the cooling efficiency of the heat exchanger.

[0011] In an optional embodiment, a one-way valve is connected in series at the outlet end of the pressure divider to prevent gas backflow.

[0012] In an optional embodiment, three pressure-dividing pipes are connected in parallel, which can perform three-way diversion and pressure reduction and preliminary treatment of the gas-solid two-phase flow at the gas field wellhead.

[0013] In an optional embodiment, the sand removal mechanism is further provided with a second diversion pipe; the second diversion pipe is connected in parallel with the first diversion pipe, and a second sand remover is connected in series with the second diversion pipe. The sand discharge end of the second sand remover is connected to the inlet of the sand collection tank, so as to divert the initially separated incoming gas according to the diameter and density properties of the solid particles, thereby improving the working efficiency of a single sand removal operation.

[0014] In an optional embodiment, the first sand separator is a cartridge sand separator and the second sand separator is a rotary sand separator.

[0015] In an optional embodiment, the cooling tube is adapted with a second pressure gauge and a second thermometer to detect the fluid pressure and temperature of the cooling tube, providing data support for the closed-loop control of the throttling valve and the heat exchanger.

[0016] In an optional embodiment, the sand collecting tank is provided with: a first sand collecting pipe, the air inlet of which is connected to a first three-way valve, the inlet of which is connected to the discharge end of the pressure-distributing debris-collecting mechanism, and one outlet of which is connected to the first sand collecting pipe; a second sand collecting pipe, the air inlet of which is connected to a second three-way valve, the inlet of which is connected to the solid discharge end of the separator, one outlet of which is connected to the second sand collecting pipe, and the other outlet of which is connected to the other outlet of the first three-way valve; two sand discharge pipes, which are correspondingly arranged with the first sand collecting pipe and the second sand collecting pipe; and a switching baffle, which is located in the middle of the sand collecting tank and is rotatable. Under the rotation of the switching baffle, the inner cavity of the sand collecting tank can be divided into a first sand collecting chamber communicating with the first sand collecting pipe and a second sand collecting chamber communicating with the second sand collecting pipe; wherein, the sand discharge end of the sand removal mechanism is connected between the first three-way valve and the second three-way valve. By controlling the first three-way valve and the second three-way valve, the sand and gravel discharged from each sand removal mechanism can be simultaneously or selectively input into the sand collection tank, thereby achieving uninterrupted sand transportation operations in the tank during the production separation process and further ensuring production efficiency.

[0017] In an optional embodiment, the switching partition is provided with a rotating shaft at each of its radial ends; the rotating shaft is rotatably connected to the sand collection tank, and the outer end of the rotating shaft extends to the outside of the sand collection tank; the outer end of the rotating shaft is fitted with a fixing nut, which can fix the relative position of the switching partition and the sand collection tank body to realize the rotation or fixation of the switching partition.

[0018] In an optional embodiment, a housing is also included, in which the pressure-distributing debris-collecting mechanism, the sand-removing mechanism, the cooling metering mechanism, and the sand-collecting mechanism are all installed to facilitate the movement and installation of the gas-solid two-phase flow measurement device at the gas field wellhead.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device provided by this invention has a pressure-dividing pipe in the pressure-dividing and debris-collecting mechanism, with a throttle valve and a debris collector connected in series. The throttle valve reduces the pressure of the introduced gas-solid two-phase flow at the wellhead, while the debris collector performs preliminary separation of gas and solid impurities in the gas-solid two-phase flow. Multiple pressure-dividing pipes are connected in parallel to divert the gas-solid two-phase flow at the wellhead, reducing pressure fluctuations and impact on the debris collector, and adjusting the pressure of the gas-solid two-phase flow to a range that the flow meter can withstand. Simultaneously, the first diversion pipe of the desandering mechanism is equipped with a first desander. The sand separator is connected to the pressure-dispersing debris removal mechanism, thereby enabling further sand removal through the first sand separator. The cooling metering mechanism has a cooling pipe connected in series with a heat exchanger, a separator, and a flow meter. The heat exchanger cools the gas-solid two-phase flow at the wellhead after further sand removal, adjusting the temperature of the gas-solid two-phase flow at the wellhead to a range that the flow meter can withstand. The separator then separates the solid and gas phases of the cooled gas-solid two-phase flow at the wellhead, and the gas is fed into the flow meter for gas flow measurement. This avoids pipe bursts, burns to personnel, and flow meter erosion, achieving safe and efficient metering of the gas-solid two-phase flow at the gas field wellhead.

[0021] 2. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device provided by the present invention simultaneously performs three-stage two-phase separation and sulfur deposition separation through a debris collector, a sand remover, and a separator, preventing the influence and damage of sand and sulfur deposition on the meter, reducing the separation amount of a single device, and maximizing the separation efficiency of each device.

[0022] 3. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device provided by the present invention has multiple pressure dividing pipes connected in parallel, which can divide the gas-solid two-phase flow at the wellhead. At the same time, it can perform three-stage two-phase separation and sulfur deposition separation through a debris collector, a sand remover and a separator, which can effectively reduce the pressure and temperature of the wellhead gas, while also ensuring the feasibility of manufacturing.

[0023] 4. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device provided by the present invention has multiple pressure dividing pipes connected in parallel, which can divide the gas-solid two-phase flow at the wellhead. At the same time, it performs three-stage two-phase separation and sulfur deposition separation through a debris collector, a sand remover and a separator, ensuring that the gas entering the metering process meets the gas quality requirements of the metering calibration and has a uniform flow field distribution, thus ensuring the accuracy of the metering. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] In the attached diagram:

[0026] Figure 1 This is a schematic diagram of the pipeline of the skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the pipeline of the pressure-distributing chip-collecting mechanism according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the pipeline of the sand removal mechanism according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the pipeline of the cooling metering mechanism according to an embodiment of the present invention;

[0030] Figure 5 This is a longitudinal section diagram of the switching baffle in the sand trap of the present invention in the state of being ready for use.

[0031] Figure 6 This is a cross-sectional view of the switching baffle in the sand trap of this invention in the state of being ready for use.

[0032] Figure 7 This is a longitudinal section diagram of the switching baffle in the sand trap of the present invention under working conditions.

[0033] Figure 8 This is a cross-sectional structural diagram of the switching baffle in the sand trap of this invention under working conditions.

[0034] The attached diagram shows the markings and corresponding component names:

[0035] 10-Pressure divider chip catching mechanism, 11-Pressure divider tube, 12-Throttle valve, 13-Chip catcher, 14-First pressure gauge, 15-First thermometer;

[0036] 20-Sand removal mechanism, 21-First diversion pipe, 22-First sand separator, 23-Second diversion pipe, 24-Second sand separator;

[0037] 30-Cooling metering mechanism, 31-Cooling tube, 32-Heat exchanger, 33-Separator, 34-Flow meter, 35-Second pressure gauge, 36-Second thermometer;

[0038] 40-Sand collecting mechanism, 41-Sand collecting tank, 41a-First sand collecting chamber, 41b-Second sand collecting chamber, 42-First sand collecting pipe, 43-First three-way valve, 44-Second sand collecting pipe, 45-Second three-way valve, 46-Sand discharge pipe, 47-Switching baffle, 48-Rotating shaft, 49-Fixing nut;

[0039] 50 - Outer shell, 51 - Flame-retardant sound insulation cotton;

[0040] 60 - Metering inlet pipe;

[0041] 70 - Metering exhaust pipe. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] Actual mining operations revealed that the extremely high pressure at the wellhead can cause slight deformation of orifice plate flowmeters and other differential pressure flowmeters over time. This deformation affects the pressure difference before and after throttling, leading to inaccurate measurement results. Furthermore, the wellhead production pressure is unstable. If the pressure exceeds the flowmeter's operating pressure range, it can directly damage the equipment, rendering wellhead metering operations impossible. In addition, the excessively high wellhead pressure poses a risk of overpressure vibration to the wellhead gathering pipelines and equipment, potentially leading to pipeline ruptures and other production accidents, resulting in serious consequences such as leaks and explosions. Moreover, if the wellhead is at a high temperature, the high temperature can interfere with the flowmeter sensor components, causing inaccurate measurement. Simultaneously, the high-temperature gas can cause a rapid increase in the temperature of the surrounding environment and production pipeline equipment, posing a risk of burns to on-site personnel. Secondly, high-sulfur gases will experience sulfur deposition during extraction. The solid elemental sulfur and incompletely removed sand particles will adhere to the flow meter and sensor. Since conventional gas flow meters require a uniform and stable gas flow field, this will have a significant impact on the accuracy of wellhead production measurement. Furthermore, it will accelerate the erosion and damage of equipment, pipelines, and flow meters, increasing safety hazards.

[0044] Furthermore, due to the current increase in natural gas production, the amount of sand carried at the wellhead and the content of sulfur particles are constantly increasing. Currently, conventional medium and low pressure, low temperature single-phase metering devices on site cannot solve the problem of accurate metering of sand-carrying gas-solid two-phase flow at the wellhead of ultra-high pressure, high temperature and high sulfur content gas fields. They also cannot solve the safety problems such as the impact of ultra-high pressure and high temperature on sensor accuracy, possible pipe bursts, personnel burns and flow meter erosion, as well as the erosion problem caused by sand particles and sulfur particles on the flow meter.

[0045] Currently, research on existing natural gas wellhead metering devices mainly focuses on low- and medium-pressure, single-phase, or gas-liquid two-phase operating conditions. There is a general lack of research on wellhead flow measurement under ultra-high pressure (formation pressure greater than or equal to 70 MPa), high temperature (formation temperature greater than or equal to 150℃), and high sulfur content (0.226–18 g / m³) gas-solid two-phase flow conditions. If existing wellhead metering devices used for low- and medium-pressure conditions are employed for wellhead metering of ultra-high pressure, high temperature, and high sulfur content gas wells in the Sichuan Basin, it could potentially lead to pipeline overpressure, pipe bursts, decreased sensor accuracy, flow meter erosion, and other problems.

[0046] In summary, based on the unconventional operating conditions of ultra-high pressure, high temperature, and high sulfur content gas-solid two-phase flow in parts of the Sichuan Basin, and considering the safety and economic requirements of the field equipment due to these unconventional characteristics, this embodiment proposes a skid-mounted gas field wellhead gas-solid two-phase flow measurement device. This device can achieve safe metering at the wellhead of ultra-high pressure, high temperature, and high sulfur content gas fields while ensuring economy and portability, avoiding production problems such as pipeline bursts, equipment erosion, and personnel burns. Simultaneously, it can reduce the impact of gas-solid two-phase flow at the wellhead on the flowmeter's measurement accuracy, thereby ensuring the safe extraction and metering of natural gas in the Sichuan Basin of my country. Details are as follows:

[0047] Example

[0048] Combination Figures 1-4 This embodiment provides a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, including: a pressure-distributing debris-collecting mechanism 10, with multiple pressure-distributing pipes 11 connected in parallel, each pressure-distributing pipe 11 being sequentially connected to a throttle valve 12 and a debris collector 13, and the air inlet end of each pressure-distributing pipe 11 being used to connect to a metering air inlet pipe 60, the metering air inlet pipe 60 being used to connect to the wellhead; and a sand removal mechanism 20, equipped with a first diversion pipe 21, the first diversion pipe 21 being connected to the air outlet end of the pressure-distributing debris-collecting mechanism 10. The first branch pipe 21 is connected in series with a first sand remover 22; the cooling metering mechanism 30 is provided with a cooling pipe 31, which is connected in series with a heat exchanger 32, a separator 33 and a flow meter 34, and the air inlet of the cooling pipe 31 is connected to the air outlet of the first branch pipe 21; the sand collection mechanism 40 is provided with a sand collection tank 41, the inlet of which is connected to the chip discharge end of the chip catcher 13, the sand discharge end of the first sand remover 22 and the solid discharge end of the separator 33 respectively. Each branch is equipped with a corresponding switching valve to control the on / off state of each branch.

[0049] Combination Figure 1 and Figure 2 Specifically, the pressure divider tube 11 is equipped with a first pressure gauge 14 and a first thermometer 15 to detect the pressure and temperature of the two-phase flow in each pressure divider tube 11, providing data support for adjusting the throttle valve 12 and the cooling efficiency of the heat exchanger 32.

[0050] Meanwhile, a one-way valve is connected in series at the outlet end of the pressure divider pipe 11 to prevent gas backflow. This can prevent the treated gas or gravel from backflowing due to pressure fluctuations, which could damage the device.

[0051] In this embodiment, three pressure-dividing pipes 11 are connected in parallel, which can perform three-way diversion and pressure reduction and preliminary treatment of the gas-solid two-phase flow at the gas field wellhead.

[0052] Thus, the raw material gas discharged from the metering inlet pipe 60 is first diverted and depressurized and cooled by the pressure-collecting mechanism. Then, the diverted raw material gas is collected by the dust collector 13 installed in the pressure-collecting pipe 11, so that it is initially separated in the pressure-collecting pipe 11. On this basis, the initially separated solid particles are collected by setting a first-stage separation manifold and then discharged into the sand collection tank 41.

[0053] Combination Figure 3 The sand removal mechanism 20 is also provided with a second diversion pipe 23; the second diversion pipe 23 is connected in parallel with the first diversion pipe 21, and the second diversion pipe 23 is connected in series with a second sand remover 24. The sand discharge end of the second sand remover 24 is connected to the inlet of the sand collection tank 41, so as to divert the initially separated incoming gas according to the diameter and density properties of the solid particles, thereby improving the working efficiency of a single sand removal operation.

[0054] In other words, the sand removal mechanism 20 can perform two-stage sand removal, diverting the initially separated incoming gas according to the diameter and density of the solid particles, thus improving the efficiency of a single sand removal operation. Simultaneously, the pressure of the initially separated incoming gas can be reduced by setting a throttling valve 12, further preventing safety accidents caused by excessive pressure or temperature during production. Then, the solid particles from the secondary separation are collected and discharged into the sand collection tank 41 through a secondary separation manifold.

[0055] It should be understood that the sand removal mechanism 20 is determined according to actual needs. When the diameter and density of the incoming gas particles are large, multiple rotary sand removers can be used, while when the diameter and density of the incoming gas particles are small, multiple cartridge sand removers can be set. In this embodiment, the first sand remover 22 is a cartridge sand remover and the second sand remover 24 is a rotary sand remover. Of course, a one-to-many configuration can also be used for further processing, depending on the incoming gas pressure in the pressure dividing pipe 11. The higher the gas pressure, the more pressure dividing pipes 11 and diversion pipes can be connected to achieve better diversion and pressure reduction.

[0056] Among them, the vertical separator 33 of the cooling metering mechanism 30 can collect the sand and gravel entering the cooling metering mechanism 30 three times to achieve effective separation of sand and gravel, and the gas components are measured by the flow meter 34 to measure the gas at the wellhead.

[0057] Combination Figure 4 The cooling tube 31 is equipped with a second pressure gauge 35 and a second thermometer 36 to detect the fluid pressure and temperature of the cooling tube 31, providing data support for the closed-loop control of the throttle valve 12 and the heat exchanger 32.

[0058] Combination Figure 5-8Specifically, the sand collection tank 41 is equipped with: a first sand collection pipe 42, the air inlet of which is connected to a first three-way valve 43, the inlet of which is connected to the discharge end of the pressure-distributing chip collection mechanism 10, and one outlet of which is connected to the first sand collection pipe 42; and a second sand collection pipe 44, the air inlet of which is connected to a second three-way valve 45, the inlet of which is connected to the discharge end of the separator 33, one outlet of which is connected to the second sand collection pipe 44, and the other outlet of which is connected to the first three-way valve 45. Another outlet of 43 is connected; two sand discharge pipes 46 are provided, which are correspondingly arranged with the first sand collection pipe 42 and the second sand collection pipe 44; a switching baffle 47 is provided in the middle of the sand collection tank 41, and the switching baffle 47 can rotate. Under the rotation of the switching baffle 47, the inner cavity of the sand collection tank 41 can be divided into a first sand collection chamber 41a connected to the first sand collection pipe 42 and a second sand collection chamber 41b connected to the second sand collection pipe 44; wherein, the sand discharge end of the sand removal mechanism 20 is connected between the first three-way valve 43 and the second three-way valve 45. By controlling the first three-way valve 43 and the second three-way valve 45, the sand discharged by each sand removal mechanism 20 can be simultaneously or selectively input into the sand collection tank 41, thereby realizing the sand transportation operation in the tank without interrupting the production separation process, and further ensuring production efficiency.

[0059] In this embodiment, the two ends of the switching partition 47 are respectively provided with rotating shafts 48; the rotating shafts 48 are rotatably connected to the sand collection tank 41, and the outer end of the rotating shafts 48 extends to the outside of the sand collection tank 41; the outer end of the rotating shafts 48 is fitted with a fixing nut 49, which can fix the relative position of the switching partition 47 and the tank body of the sand collection tank 41, so as to realize the rotation or fixation of the switching partition 47.

[0060] This enables rapid gas-solid separation using a three-stage throttling process even under conditions where the incoming gas contains a high sand content. Furthermore, the rotatable tank design allows the tank interior to be divided into two independent sections. Figure 7 and Figure 8 One side performs sand cleaning inside the tank, while the other side continues to collect the separated solid particles, achieving the effect of "one tank for two purposes" and improving production efficiency. The continuous sand collection of a single tank can save land and reduce costs, and avoid the high cost, complex process and large space occupation of multiple sand storage devices in the skid, which are not suitable for skid-mounted wellhead metering problems.

[0061] It is understood that this embodiment also includes a housing 50, in which the pressure-distributing debris-collecting mechanism 10, the sand-removing mechanism 20, the cooling metering mechanism 30, and the sand-collecting mechanism 40 are all installed, so as to facilitate the movement and installation of the gas-solid two-phase flow measurement device at the gas field wellhead.

[0062] In summary, the skid-mounted gas-solid two-phase flow measurement device for gas field wellheads provided in this embodiment reduces the pressure of the introduced gas-solid two-phase flow at the wellhead through the throttle valve 12. The debris collector 13 can initially separate the gas and solid impurities in the gas-solid two-phase flow at the wellhead and divert the gas-solid two-phase flow to reduce pressure fluctuations and impacts on the debris collector 13, adjusting the pressure of the gas-solid two-phase flow at the wellhead to a range that the flow meter 34 can withstand. At the same time, the first desander 22 performs further desanding treatment, and the heat exchanger 32 cools the gas-solid two-phase flow after further desanding treatment to adjust the temperature of the gas-solid two-phase flow at the wellhead to a range that the flow meter 34 can withstand. Then, the separator 33 performs solid-gas separation treatment on the cooled gas-solid two-phase flow at the wellhead, thereby measuring the gas flow rate through the flow meter 34. Finally, the solid impurities separated from the gas-solid two-phase flow at the gas field wellhead are centrally processed through the sand collection tank 41.

[0063] Therefore, this embodiment can perform pressure reduction and temperature reduction on the gas-solid two-phase flow at the gas field wellhead, and simultaneously perform three-stage two-phase separation through the debris collector 13, sand remover and separator 33, thereby removing impurities from the gas-solid two-phase flow at the gas field wellhead and reducing the pressure and temperature of the gas flow to within the measurement conditions of the flow meter 34, thus avoiding pipe bursts, personnel burns and erosion of the flow meter 34, and achieving safe and efficient metering of the gas-solid two-phase flow at the gas field wellhead.

[0064] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A skid-mounted gas-solid two-phase flow measurement device for gas field wellheads, characterized in that, include: The pressure-dividing debris-catching mechanism (10) is provided with multiple pressure-dividing pipes (11) in parallel. Each pressure-dividing pipe (11) is connected in series with a throttle valve (12) and a debris catcher (13). The air inlet end of each pressure-dividing pipe (11) is used to connect to a metering air inlet pipe (60), which is used to connect to the wellhead. The sand removal mechanism (20) is provided with a first diversion pipe (21), which is connected to the air outlet of the pressure-dividing debris collection mechanism (10), and a first sand remover (22) is connected in series with the first diversion pipe (21). The cooling metering mechanism (30) is equipped with a cooling pipe (31), and the cooling pipe (31) is connected in series with a heat exchanger (32), a separator (33) and a flow meter (34). The air inlet of the cooling pipe (31) is connected to the air outlet of the first diversion pipe (21). The sand collection mechanism (40) is equipped with a sand collection tank (41), the inlet of which is connected to the chip discharge end of the chip catcher (13), the sand discharge end of the first sand remover (22), and the solid discharge end of the separator (33).

2. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that, The pressure divider tube (11) is adapted to a first pressure gauge (14) and a first thermometer (15).

3. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1 or 2, characterized in that, A one-way valve is connected in series at the outlet end of the pressure divider pipe (11).

4. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that, The pressure divider tubes (11) are arranged in three parallel lines.

5. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that, The sand removal mechanism (20) is also provided with a second diversion pipe (23); The second diversion pipe (23) is connected in parallel with the first diversion pipe (21), and the second diversion pipe (23) is connected in series with a second sand remover (24). The sand discharge end of the second sand remover (24) is connected to the inlet of the sand collection tank (41).

6. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 5, characterized in that, The first sand separator (22) is a cartridge sand separator, and the second sand separator (24) is a rotary sand separator.

7. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that, The cooling tube (31) is equipped with a second pressure gauge (35) and a second thermometer (36).

8. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that, The sand collection tank (41) is equipped with: The first sand collecting pipe (42) has an air inlet end connected to a first three-way valve (43), the inlet of the first three-way valve (43) is connected to the chip discharge end of the pressure-dividing chip collection mechanism (10), and one outlet of the first three-way valve (43) is connected to the first sand collecting pipe (42). The second sand collection pipe (44) has an air inlet end connected to a second three-way valve (45), the inlet of the second three-way valve (45) is connected to the discharge end of the separator (33), one outlet of the second three-way valve (45) is connected to the second sand collection pipe (44), and the other outlet of the second three-way valve (45) is connected to the other outlet of the first three-way valve (43). Sand discharge pipe (46), two sand discharge pipes (46) are provided, and the two sand discharge pipes (46) are provided in correspondence with the first sand collection pipe (42) and the second sand collection pipe (44); A switching partition (47) is provided in the middle of the sand collection tank (41), and the switching partition (47) is rotatable. Under the rotation of the switching partition (47), the inner cavity of the sand collection tank (41) can be divided into a first sand collection cavity (41a) connected to the first sand collection pipe (42) and a second sand collection cavity (41b) connected to the second sand collection pipe (44). The sand discharge end of the sand removal mechanism (20) is connected between the first three-way valve (43) and the second three-way valve (45).

9. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 8, characterized in that, The switching partition (47) is provided with rotating shafts (48) at both ends in the radial direction; The rotating shaft (48) is rotatably connected to the sand collection tank (41), and the outer end of the rotating shaft (48) extends to the outside of the sand collection tank (41); The outer end of the rotating shaft (48) is fitted with a fixing nut (49), which can fix the relative position of the switching partition (47) and the sand collection tank (41).

10. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that, It also includes a housing (50), in which the pressure-distributing debris-collecting mechanism (10), the sand-removing mechanism (20), the cooling metering mechanism (30) and the sand-collecting mechanism (40) are all installed.

Images