Skid-mounted gas field wellhead gas-solid two-phase flow measuring device

Abstract

The invention discloses a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, and relates to the technical field of two-phase flow measurement. Comprising a partial pressure scrap catching mechanism which is provided with a plurality of partial pressure pipes in parallel, each partial pressure pipe is sequentially connected with a throttling valve and a scrap catcher in series, and a metering air inlet pipe is used for being connected with a wellhead; the sand removing mechanism is provided with a first flow dividing pipe, the first flow dividing pipe is communicated with the air outlet end of the partial pressure scrap catching mechanism, and the first flow dividing pipe is connected with a first sand remover in series; the cooling metering mechanism is provided with a cooling pipe, the cooling pipe is sequentially connected with a heat exchanger, a separator and a flow meter in series, and the air inlet end of the cooling pipe is connected with the air outlet end of the first flow dividing pipe; and the sand collecting mechanism is provided with a sand collecting tank, and an inlet of the sand collecting tank is connected with the scrap discharging end of the scrap catcher, the sand discharging end of the first sand remover and the solid discharging end of the separator. The gas-solid two-phase flow measuring device can accurately measure the gas-solid two-phase flow at the field wellhead.

Description

Technical Field

[0001] The invention relates to the technical field of two-phase flow measurement, and in particular to a skid-mounted gas-solid two-phase flow measurement device at a gas field wellhead. Background Art

[0002] Natural gas is a colorless mixed gas with low carbon content and rich in alkanes. Its main use is as fuel. It can be used to make carbon black, chemicals and liquefied petroleum gas. Propane and butane produced from natural gas are important raw materials for modern industry. As a transition energy from traditional mineral energy to green energy such as hydrogen energy, wind energy and nuclear energy, natural gas will play a vital role in the industrial development in the next few decades.

[0003] Natural gas is stored in the strata and is a mixture of gases mainly composed of hydrocarbons and non-hydrocarbons. After the gas in the natural gas reservoir is extracted, it is necessary to further measure the total amount of gas extracted and verify the actual extraction volume of single wells, multiple wells and blocks. The obtained measurement value is an important indicator of industrial links such as natural gas handover, trade, and storage, and directly determines the technical implementation plan and trade fairness of each subsequent industrial link. In addition, accurate measurement at the wellhead of the gas field is a necessary pre-process for the safe extraction, transportation and storage of natural gas in Southwest my country, and it is also a key trade benchmark for transactions with downstream gas companies.

[0004] However, in the process of exploitation of natural gas in the main production areas of the Sichuan Basin, there are "three highs" gas field conditions of ultra-high pressure, high temperature and high sulfur content. When exploiting natural gas in sandstone reservoirs and deeper reservoirs, fracturing technology is often used to exploit natural gas reservoirs. In the fracturing process, in addition to the artificial addition of sand particles to break up the reservoir, the sand particles and sulfur elements in the original reservoir will also be carried out of the wellhead with the exploitation of the gas reservoir, and will be carried out of the wellhead by the high-pressure airflow, which will lead to the production of gas from the wellhead of the field field not being pure gas-phase natural gas, but a gas-solid two-phase medium mixed with sand particles and sulfur elements. At the existing conventional natural gas development and production sites, for gas-solid two-phase fluids, a desander plus a standard orifice flowmeter is used to achieve the metering of the wellhead output gas. However, the working conditions at the wellhead of the ultra-high pressure, high temperature and high sulfur gas fields in the Sichuan Basin are far different from the conventional medium and low pressure gas field wellhead metering working conditions, resulting in low metering accuracy. Therefore, the existing single-phase metering device cannot accurately measure the gas-solid two-phase flow rate at the wellhead of the gas field. Summary of the invention

[0005] In order to solve the technical problem that a single-phase metering device cannot accurately measure the gas-solid two-phase flow rate at a gas field wellhead, the present invention provides a skid-mounted gas-solid two-phase flow rate measuring device at a gas field wellhead, which can reduce the influence of ultra-high pressure and high temperature gas-solid two-phase flow on sensor measurement, thereby performing accurate measurement.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, comprising: a pressure-dividing and chip-catching mechanism, in which a plurality of pressure-dividing tubes are provided in parallel, each of the pressure-dividing tubes is sequentially connected in series with a throttle valve and a chip catcher, and the air inlet end of each of the pressure-dividing tubes is used to connect to a metering air inlet pipe, and the metering air inlet pipe is used to connect to a wellhead; a sand removal mechanism, in which a first shunt pipe is provided, the first shunt pipe is connected to an air outlet end of the pressure-dividing and chip-catching mechanism, and the first shunt pipe is serially connected to a first desander; a cooling and metering mechanism, in which a cooling pipe is provided, the cooling pipe is sequentially serially connected with a heat exchanger, a separator and a flow meter, and the air inlet end of the cooling pipe is connected to an air outlet end of the first shunt pipe; a sand collecting mechanism, in which a sand collecting tank is provided, and the inlet of the sand collecting tank is respectively connected to a chip discharge end of the chip catcher, a sand discharge end of the first desander and a solid discharge end of the separator.

[0008] The present invention provides a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, wherein the pressure dividing pipes of the pressure dividing and chip catching mechanism are sequentially connected in series with a throttle valve and a chip catcher, and the pressure of the introduced gas-solid two-phase flow at the field wellhead can be reduced through the throttle valve, and the chip catcher can preliminarily separate the gas and solid debris in the gas-solid two-phase flow at the field wellhead, and a plurality of pressure dividing pipes are arranged in parallel, and the gas-solid two-phase flow at the field wellhead can be diverted to reduce the pressure fluctuation of the gas-solid two-phase flow at the field wellhead and the impact on the chip catcher, and the pressure of the gas-solid two-phase flow at the field wellhead can be adjusted to a range that the flow meter can withstand; at the same time, the sand removal mechanism The first shunt pipe is provided with a first desander, which is connected to the pressure-dividing debris collection mechanism, so that further desandering is performed through the first desander, and the cooling pipe of the temperature-reducing metering mechanism is sequentially connected in series with a heat exchanger, a separator and a flow meter, so that the gas-solid two-phase flow at the wellhead of the field after further desandering is cooled through the heat exchanger, so that the temperature of the gas-solid two-phase flow at the wellhead of the field is adjusted to the range that the flow meter can bear, and then the cooled gas-solid two-phase flow at the wellhead of the field is separated into solid and gas through the separator, and the gas is input into the flow meter, so that the gas flow is measured through the flow meter. In addition, the inlet of the sand collecting tank is respectively connected to the chip discharge end of the chip catcher, the sand discharge end of the first desander and the solid discharge end of the separator, so that the solid debris separated from the gas-solid two-phase flow at the wellhead of the gas field is centrally processed through the sand collecting tank.

[0009] Therefore, the skid-mounted gas field wellhead gas-solid two-phase flow rate measuring device provided by the present invention can perform pressure separation, pressure reduction and temperature reduction treatment on the gas field wellhead gas-solid two-phase flow, and simultaneously perform three-stage two-phase separation through a chip collector, a sand remover and a separator, thereby removing debris in the gas field wellhead gas-solid two-phase flow, and reducing the pressure and temperature of the airflow to within the measurement conditions of the flowmeter, thereby avoiding pipeline burst, personnel scalding and flowmeter erosion, and realizing safe and efficient measurement of the gas-solid two-phase flow at the gas field wellhead.

[0010] In an optional embodiment, the pressure dividing tube is equipped with a first pressure gauge and a first thermometer to detect the pressure and temperature of the two-phase flow in each pressure dividing 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 to the gas outlet end of the pressure dividing tube to prevent gas backflow.

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

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

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

[0015] In an optional embodiment, the cooling pipe is equipped with a second pressure gauge and a second thermometer to detect the fluid pressure and temperature of the cooling pipe and provide data support for the closed-loop control of the throttle 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 end of the first sand collecting pipe is connected to a first three-way valve, the inlet of the first three-way valve is connected to the chip discharge end of the pressure-dividing chip catching mechanism, and an outlet of the first three-way valve is connected to the first sand collecting pipe; a second sand collecting pipe, the air inlet end of the second sand collecting pipe is connected to a second three-way valve, the inlet of the second three-way valve is connected to the solid discharge end of the separator, an outlet of the second three-way valve is connected to the second sand collecting pipe, and another outlet of the second three-way valve is connected to another outlet of the first three-way valve; a sand discharge pipe, two sand discharge pipes are provided, and the two sand discharge pipes are correspondingly provided with the first sand collecting pipe and the second sand collecting pipe; a switching partition is provided in the middle of the sand collecting tank, and the switching partition can rotate. Under the rotation of the switching partition, the inner cavity of the sand collecting tank can be divided into a first sand collecting chamber connected to the first sand collecting pipe and a second sand collecting chamber connected to 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. Through the control of the first three-way valve and the second three-way valve, the sand and gravel discharged by each sand removal mechanism are simultaneously or selectively input into the sand collecting tank, thereby realizing the sand transportation operation in the tank during the production separation process without interruption, and further ensuring production efficiency.

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

[0018] In an optional embodiment, it also includes a shell, and the pressure-dividing debris capturing mechanism, the sand removing mechanism, the temperature-lowering metering mechanism and the sand collecting mechanism are all installed in the shell to facilitate the movement and installation of the gas-solid two-phase flow measurement device at the wellhead of the gas field.

[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 the present invention has a pressure dividing pipe of a pressure dividing and chip catching mechanism which is sequentially connected in series with a throttle valve and a chip catcher, which can reduce the pressure of the introduced gas-solid two-phase flow at the field wellhead through the throttle valve, and the chip catcher can preliminarily separate the gas and solid impurities in the gas-solid two-phase flow at the field wellhead, and a plurality of pressure dividing pipes are arranged in parallel, which can divert the gas-solid two-phase flow at the field wellhead to reduce the pressure fluctuation of the gas-solid two-phase flow at the field wellhead and the impact on the chip catcher, and adjust the pressure of the gas-solid two-phase flow at the field wellhead to a range that the flow meter can withstand; at the same time, the first diverter pipe of the desanding mechanism is provided with a first desanding device, and the first desanding device is provided with a first desanding device. The sand collector is connected to the pressure-dividing debris collecting mechanism, so that further sand removal is carried out through the first sand remover, and the cooling pipe of the cooling metering mechanism is serially connected with a heat exchanger, a separator and a flow meter in sequence, so as to cool the gas-solid two-phase flow at the wellhead after further sand removal through the heat exchanger, so as to adjust the temperature of the gas-solid two-phase flow at the wellhead to the range that the flow meter can withstand, and then the cooled gas-solid two-phase flow at the wellhead is separated into solid and gas through the separator, and the gas is input into the flow meter, so as to measure the gas flow through the flow meter, and avoid pipe burst, personnel scalding and flow meter erosion, so as to realize safe and efficient metering of gas-solid two-phase flow at the wellhead of the gas field.

[0021] 2. The skid-mounted gas field wellhead gas-solid two-phase flow rate measuring device provided by the present invention simultaneously performs three-stage two-phase separation and separation of sulfur deposition through a chip catcher, a sand remover and a separator, thereby preventing the influence and damage of sand and sulfur deposition on the meter, reducing the separation amount of a single device, and being able to maximize the separation efficiency of each device.

[0022] 3. The skid-mounted gas field wellhead gas-solid two-phase flow rate measuring device provided by the present invention has multiple pressure divider pipes arranged in parallel, which can divert the gas-solid two-phase flow at the field wellhead, and at the same time perform three-stage two-phase separation and sulfur deposition separation through a chip collector, a sand remover and a separator, which can effectively reduce the pressure and temperature of the wellhead gas, and also ensure the feasibility of manufacturing.

[0023] 4. The skid-mounted gas field wellhead gas-solid two-phase flow rate measuring device provided by the present invention has multiple pressure divider pipes arranged in parallel, which can divert the gas-solid two-phase flow at the field wellhead, and at the same time perform three-stage two-phase separation and sulfur deposition separation through a chip catcher, a sand remover and a separator, thereby ensuring that the gas entering the metering process meets the gas quality requirements of the metering calibration and uniform flow field distribution, thereby ensuring the accuracy of the metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] In the attached picture:

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

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

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

[0029] Figure 4 This is a schematic diagram of the piping principle of the temperature reduction metering mechanism according to an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of the longitudinal structure of the switch partition in the sand catching tank in an embodiment of the present invention in a state ready for use;

[0031] Figure 6 It is a schematic cross-sectional structure diagram of a switch partition in a sand catching tank in an embodiment of the present invention in a state ready for use;

[0032] Figure 7 It is a schematic diagram of the longitudinal section structure of the switching partition in the sand catching tank in the embodiment of the present invention in the working state;

[0033] Figure 8 It is a schematic cross-sectional structure diagram of a switching partition in a sand catching tank in an embodiment of the present invention in a working state.

[0034] Marks and corresponding parts names in the attached drawings:

[0035] 10-pressure dividing chip catching mechanism, 11-pressure dividing pipe, 12-throttle valve, 13-chip catcher, 14-first pressure gauge, 15-first thermometer;

[0036] 20-sand removal mechanism, 21-first diverter pipe, 22-first desander, 23-second diverter pipe, 24-second desander;

[0037] 30-cooling metering mechanism, 31-cooling pipe, 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 partition, 48-rotating shaft, 49-fixing nut;

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

[0040] 60-metering intake pipe;

[0041] 70 - Metered exhaust pipe. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0043] It has been found through actual mining that the ultra-high pressure at the wellhead may cause the differential pressure flowmeters such as orifice flowmeters to undergo slight deformation at the orifice plate as the use time increases, thereby affecting the pressure difference before and after throttling, resulting in metering results that are inconsistent with the actual situation. Moreover, the production pressure at the wellhead is not stable. If the pressure exceeds the working pressure range of the flowmeter, it will directly cause damage to the equipment and fail to complete the wellhead metering operation. In addition, the ultra-high wellhead pressure poses a risk of overpressure vibration to the wellhead gathering and transportation pipelines and equipment, and may even cause production accidents such as pipeline bursts, resulting in serious consequences such as leakage and explosion. Moreover, if the wellhead is in a high temperature state, the higher temperature will interfere with the components of the flowmeter sensor, resulting in inaccurate metering accuracy. At the same time, the high temperature gas will also cause the temperature of the surrounding environment and production pipeline equipment to rise rapidly, posing a risk of scalding to on-site workers. Thirdly, sulfur deposition will occur during the mining process of high-sulfur gas. The solid elemental sulfur formed and the sand particles that are not completely removed will adhere to the flow meter and sensor. Since conventional gas flow meters require a uniform and stable gas flow field, it will have a huge impact on the accuracy of wellhead production measurement. Secondly, it will accelerate the erosion and damage of equipment pipelines and flow meters, increasing safety hazards.

[0044] In addition, due to the current increase in natural gas production, the amount of sand and sulfur particles carried at the wellhead is constantly increasing. The current conventional medium-low pressure and low-temperature single-phase metering devices on site can neither solve the problem of accurate metering of gas-solid two-phase flow carrying sand at the wellhead of ultra-high pressure, high temperature and high sulfur content gas fields, nor solve the impact of ultra-high pressure and high temperature on sensor accuracy, possible pipeline bursts, personnel burns and flowmeter erosion and other safety issues, as well as the erosion of flowmeters caused by sand and sulfur particles.

[0045] At present, the existing natural gas wellhead metering devices are mainly focused on the research under medium and low pressure, single phase or gas-liquid two-phase working conditions, and there is a general lack of research on wellhead flow measurement under ultra-high pressure (formation pressure greater than or equal to 70Mpa), high temperature (formation temperature greater than or equal to 150℃), and high sulfur content (0.226-18g / m3) gas-solid two-phase flow conditions. If the existing wellhead metering devices under medium and low pressure conditions are used to carry out wellhead metering work for ultra-high pressure, high temperature, and high sulfur content gas wells in the Sichuan Basin, it may cause pipeline overpressure, pipe burst, sensor accuracy reduction, flow meter erosion and other problems.

[0046] In summary, based on the unconventional working conditions of ultra-high pressure, high temperature, and high sulfur content gas-solid two-phase flow in some parts of the Sichuan Basin, and considering the safety and economic requirements of the above-mentioned unconventional characteristics for on-site devices, this embodiment proposes a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, which can achieve safe metering of ultra-high pressure, high temperature, and high sulfur content gas field wellheads on the basis of ensuring economy and mobility, avoiding production problems such as pipeline bursts, equipment erosion, and personnel burns, and at the same time can reduce the impact of the gas-solid two-phase flow at the wellhead on the metering accuracy of the flowmeter, thereby ensuring the safe exploitation and metering of natural gas in my country's Sichuan Basin. The details are as follows:

[0047] Example

[0048] Combination Figure 1-Figure 4 The present embodiment provides a skid-mounted gas field wellhead gas-solid two-phase flow measurement device, comprising: a pressure-dividing chip-catching mechanism 10, with a plurality of pressure-dividing pipes 11 connected in parallel, each of the pressure-dividing pipes 11 being sequentially connected in series with a throttle valve 12 and a chip-catching device 13, and the air inlet end of each of the pressure-dividing pipes 11 being used to connect to a metering air inlet pipe 60, the metering air inlet pipe 60 being used to connect to a wellhead; a sand removal mechanism 20, with a first shunt pipe 21, the first shunt pipe 21 being connected to the air outlet end of the pressure-dividing chip-catching mechanism 10 , and the first shunt pipe 21 is connected in series with the first desander 22; the cooling metering mechanism 30 is provided with a cooling pipe 31, and the cooling pipe 31 is sequentially connected in series with a heat exchanger 32, a separator 33 and a flow meter 34, and the air inlet end of the cooling pipe 31 is connected to the air outlet end of the first shunt pipe 21; the sand collecting mechanism 40 is provided with a sand collecting tank 41, and the inlet of the sand collecting tank 41 is respectively connected to the chip discharge end of the chip catcher 13, the sand discharge end of the first desander 22 and the solid discharge end of the separator 33. Among them, each branch is adapted with a corresponding switch valve to realize the on-off control of each branch.

[0049] Combination Figure 1 and Figure 2 Specifically, the pressure dividing 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 dividing tube 11, and provide data support for adjusting the throttle valve 12 and the cooling efficiency of the heat exchanger 32.

[0050] At the same time, a one-way valve is connected in series to the gas outlet end of the pressure dividing tube 11 to avoid gas backflow, thereby preventing the treated gas or gravel from backflowing due to pressure fluctuations and causing damage to the device.

[0051] As for the pressure dividing pipes 11, in the present embodiment, three pressure dividing pipes 11 are arranged in parallel, so as to perform three-way flow diversion, pressure reduction and preliminary treatment on the gas-solid two-phase flow at the wellhead of the gas field.

[0052] Therefore, the raw gas discharged from the metering air inlet pipe 60 is first diverted, depressurized and cooled by the pressure-collecting mechanism, and then the diverted raw gas is collected by the chip catcher 13 arranged in the pressure-dividing pipe 11, so that it is preliminarily separated in the pressure-dividing pipe 11; on this basis, a first-level separation manifold is arranged to collect the preliminarily separated solid particles, and then discharge them into the sand collecting tank 41.

[0053] Combination Figure 3 The desanding mechanism 20 is also provided with a second diverter pipe 23; the second diverter pipe 23 is connected in parallel with the first diverter pipe 21, and the second diverter pipe 23 is connected in series with a second desander 24, and the sand discharge end of the second desander 24 is connected to the inlet of the sand collecting 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 desanding operation.

[0054] That is to say, the sand removal mechanism 20 can remove sand in two stages, and can divert the initially separated incoming gas according to the diameter and density of the solid particles, thereby improving the working efficiency of a single sand removal operation. At the same time, the throttle valve 12 can also be set to throttle and reduce the pressure of the incoming gas after the initial separation, further preventing safety accidents caused by excessive pressure and temperature during the production process. Then, the solid particles separated by the second stage are discharged into the sand collecting tank 41 by setting a secondary separation manifold.

[0055] It should be understood that the desander mechanism 20 is determined according to actual needs. When the diameter and density of the incoming gas particles are large, more rotary desanders can be used. When the diameter and density of the incoming gas particles are small, multiple cartridge desanders are set. In this embodiment, the first desander 22 is a cartridge desander, and the second desander 24 is a rotary desander. Of course, a one-to-many setting method can also be used for further processing, which is specifically determined according to the incoming gas pressure in the pressure dividing tube 11. The greater the pressure, the more pressure dividing tubes 11 and shunt tubes can be connected to achieve better shunt and pressure reduction.

[0056] Among them, the vertical separator 33 of the cooling and metering mechanism 30 can capture the sand and gravel entering the cooling and metering mechanism 30 three times, thereby achieving an effective separation effect of the sand and gravel, and the gas component is measured by the flow meter 34 to measure the wellhead gas.

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

[0058] Combination Figure 5-8Specifically, the sand collecting tank 41 is provided with: a first sand collecting pipe 42, the air inlet end of the first sand collecting pipe 42 is 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 catching mechanism 10, and an outlet of the first three-way valve 43 is connected to the first sand collecting pipe 42; a second sand collecting pipe 44, the air inlet end of the second sand collecting pipe 44 is connected to a second three-way valve 45, the inlet of the second three-way valve 45 is connected to the solid discharge end of the separator 33, an outlet of the second three-way valve 45 is connected to the second sand collecting pipe 44, and the other outlet of the second three-way valve 45 is connected to the first three-way valve 43; a sand discharge pipe 46, two of which are provided, and the two sand discharge pipes 46 are provided corresponding to the first sand collecting pipe 42 and the second sand collecting pipe 44; a switching partition 47, which is provided in the middle of the sand collecting tank 41, and the switching partition 47 can rotate, and under the rotation of the switching partition 47, the inner cavity of the sand collecting tank 41 can be divided into a first sand collecting chamber 41a connected to the first sand collecting pipe 42 and a second sand collecting chamber 41b connected to the second sand collecting 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. Through the control of the first three-way valve 43 and the second three-way valve 45, the sand discharged by each sand removal mechanism 20 is simultaneously or selectively input into the sand collecting tank 41, thereby realizing the sand transportation operation in the tank during the production separation process without interruption, and further ensuring the production efficiency.

[0059] In this embodiment, a rotating shaft 48 is respectively provided at both radial ends of the switching partition 47; the rotating shaft 48 is rotatably connected to the sand collecting tank 41, and the outer end of the rotating shaft 48 extends to the outside of the sand collecting tank 41; the outer end of the rotating shaft 48 is adapted with a fixing nut 49, and the fixing nut 49 can fix the relative position of the switching partition 47 and the tank body of the sand collecting tank 41 to realize the rotation or fixation of the switching partition 47.

[0060] This can achieve rapid gas-solid separation in the three-stage throttling process under the condition of high sand content in the production gas. At the same time, the rotatable tank design can divide the tank into two independent parts ( Figure 7 and Figure 8 ), one side is cleaning the sand in the tank, and the other side continues to collect the separated solid particles, achieving the effect of "one tank with two uses", improving production efficiency, and a single tank body can realize uninterrupted sand collection, which can save space and reduce costs, and avoid the high cost, complicated process and large space occupied by multiple sand storage equipment in the device skid, which is not suitable for skid-mounted wellhead metering.

[0061] It can be understood that this embodiment also includes a shell 50, and the pressure-dividing chip capturing mechanism 10, the sand removal mechanism 20, the temperature reduction metering mechanism 30 and the sand collection mechanism 40 are all installed in the shell 50 to facilitate the movement and installation of the gas-solid two-phase flow measurement device at the wellhead of the gas field.

[0062] In summary, the skid-mounted gas field wellhead gas-solid two-phase flow rate measurement device provided by the present embodiment of the invention reduces the pressure of the introduced field wellhead gas-solid two-phase flow through the throttle valve 12, and the chip catcher 13 can preliminarily separate the gas and solid impurities in the field wellhead gas-solid two-phase flow, and divert the field wellhead gas-solid two-phase flow to reduce the pressure fluctuation of the field wellhead gas-solid two-phase flow and the impact on the chip catcher 13, and adjust the pressure of the field wellhead gas-solid two-phase flow to a range that the flowmeter 34 can withstand; at the same time, further desanding is performed by the first desander 22, and the field wellhead gas-solid two-phase flow after further desanding is cooled by the heat exchanger 32 to adjust the temperature of the field wellhead gas-solid two-phase flow to a range that the flowmeter 34 can withstand, and then the cooled field wellhead gas-solid two-phase flow is subjected to solid-gas separation by the separator 33, so as to measure the gas flow by the flowmeter 34. Finally, the solid impurities separated from the gas-solid two-phase flow at the wellhead of the gas field are centrally processed by the sand collecting tank 41 .

[0063] Therefore, this embodiment can perform pressure separation, pressure reduction and temperature reduction treatment on the gas-solid two-phase flow at the gas field wellhead, and simultaneously perform three-stage two-phase separation through the chip collector 13, the desander and the separator 33, thereby removing the debris in the gas-solid two-phase flow at the gas field wellhead, and reducing the pressure and temperature of the gas flow to the measuring conditions of the flowmeter 34, thereby avoiding pipe burst, personnel scalding and erosion of the flowmeter 34, and realizing safe and efficient measurement of the gas-solid two-phase flow at the gas field wellhead.

[0064] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in the scope of protection of the present invention.

Claims

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

4. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that: Three voltage dividing tubes (11) are arranged in parallel.

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 shunt pipe (23); The second shunt pipe (23) is connected in parallel with the first shunt pipe (21), and the second shunt pipe (23) is connected in series with a second desander (24), and the sand discharge end of the second desander (24) is connected to the inlet of the sand collecting 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 desander (22) is a cartridge type desander, and the second desander (24) is a rotary desander.

7. The skid-mounted gas field wellhead gas-solid two-phase flow measurement device according to claim 1, characterized in that: The cooling pipe (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 collecting tank (41) is provided with: A first sand collecting pipe (42), wherein the air inlet end of the first sand collecting pipe (42) is 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 catching mechanism (10), and an outlet of the first three-way valve (43) is connected to the first sand collecting pipe (42); a second sand collecting pipe (44), wherein the air inlet end of the second sand collecting pipe (44) is connected to a second three-way valve (45), the inlet of the second three-way valve (45) is connected to the solid discharge end of the separator (33), one outlet of the second three-way valve (45) is connected to the second sand collecting 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); A sand discharge pipe (46), wherein two sand discharge pipes (46) are provided, and the two sand discharge pipes (46) are provided corresponding to the first sand collection pipe (42) and the second sand collection pipe (44); A switching baffle (47) is arranged in the middle of the sand collecting tank (41), and the switching baffle (47) is rotatable. When the switching baffle (47) rotates, the inner cavity of the sand collecting tank (41) can be divided into a first sand collecting cavity (41a) communicating with the first sand collecting pipe (42) and a second sand collecting cavity (41b) communicating with the second sand collecting 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).

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 radial ends thereof; The rotating shaft (48) is rotatably connected to the sand collecting tank (41), and the outer end of the rotating shaft (48) extends outside the sand collecting tank (41); The outer end of the rotating shaft (48) is adapted to be equipped with a fixing nut (49), and the fixing nut (49) can fix the relative position between the switching partition (47) and the tank body of the sand collecting 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 comprises a shell (50), wherein the pressure-dividing chip-catching mechanism (10), the sand-removing mechanism (20), the temperature-lowering metering mechanism (30) and the sand-collecting mechanism (40) are all installed in the shell (50).

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