Thickened oil huff and puff development sealed set transportation method and device based on liquid holdup equalizer

Abstract

The present application belongs to the oil and gas field ground engineering technical field, disclose a kind of based on liquid holdup equalizer's heavy oil huff and puff development closed set transport method and device.Method includes: oil gathering: the produced liquid of several heavy oil huff and puff development oil production well enters metering station to carry out produced liquid collection and single well metering;Closed transport: the produced liquid of several seats metering station is closed transported to closed transfer equipment by pipeline;Gas-liquid equalization: liquid enters liquid holdup equalizer and is carried out gas-liquid equalization regulation by closed transfer equipment;Mixing transport pressurization: after buffering regulation by liquid holdup equalizer, produced liquid enters mixing pump by pressure transmitter and frequency converter interlock control, and is transported to centralized treatment station or joint station for crude oil treatment by mixing pump pressurization export.This application can effectively solve the problem of oil and gas pollution and safety risk caused by no assembly discharge in the existing heavy oil huff and puff open set transport process, and process flow is simple, working condition adaptability is strong, and closed set transport has good adaptability for heavy oil huff and puff development condition with lower steam-carrying capacity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas field surface engineering, and particularly relates to a closed gathering and transportation method and device suitable for steam huff and puff development of heavy oil, and especially relates to a closed gathering and transportation method and device for heavy oil huff and puff development based on a liquid holdup equalizer. BACKGROUND

[0002] Steam huff and puff development of heavy oil is a method for exploiting heavy oil by first injecting a certain amount of steam into an oil well, shutting in for a period of time, and then producing after the heat energy of the steam diffuses to the oil layer.

[0003] The current domestic and foreign heavy oil field gathering and transportation status is as follows:

[0004] Canada: Alberta Province of Canada is an important heavy oil production base in the world, mainly adopts SAGD method for heavy oil development, and the SAGD production accounts for more than 90% of the entire heavy oil production, and the gathering and treatment all adopt full-closed process.

[0005] Venezuela: mainly adopts cold production development method, and a small range of thermal production pilot test is carried out in some blocks, the gathering and dehydration process of the cold production block is similar to the light oil gathering and treatment process in Xinjiang Oilfield of China, and belongs to closed and semi-closed process.

[0006] Kazakhstan: mainly adopts huff and puff development, and generally adopts three-stage open process of well site-metering station-transfer station-treatment station, and the crude oil dehydration adopts large tank thermal chemical sedimentation dehydration process, wherein the well site, transfer station and crude oil treatment station all have non-closed links.

[0007] Liaohe Oilfield in China: covers huff and puff, steam drive, SAGD, fire drive and other development methods. Huff and puff and steam drive development adopt traditional open process, i.e. "single well→multi-valve metering manifold→transfer station→treatment station", in recent years, some transfer stations are transformed into semi-closed transfer process of "oil-gas separator+ booster pump", and the associated gas is mostly dispersed through a dispersion pipe or dispersed after desulfurization. SAGD development blocks have open (mixed with huff and puff produced liquid after heat exchange) and closed (high-temperature centrifugal pump) two modes.

[0008] Xinjiang Oilfield in China: the steam content (%w) of the huff and puff development area in Fengcheng Oilfield of Xinjiang is as high as 15% to 20%, and currently adopts "micro-positive pressure oil-gas separation, circulating spray cooling, high-temperature closed transfer" process, which is the first to realize closed gathering and transportation in the field of super heavy oil huff and puff development at home and abroad.

[0009] In summary, the domestic thickened oil huff and puff development generally adopts a three-stage station arrangement process of 'wellhead→ metering station→ transfer station→ treatment station'. The transfer station is provided with an open buffer tank, which can buffer the incoming liquid and flash and cool the produced liquid during the blowout period, so as to ensure the smooth operation of the back-end treatment station. However, during the normal pressure flashing and separation process of the high-temperature produced liquid on the top of the buffer tank of the transfer station, a certain amount of steam, associated gas and hydrogen sulfide will be directly discharged into the atmosphere without organization, thereby causing obvious oil and gas odor in the oilfield and nearby residential areas, which does not meet the overall requirements of safety and environmental protection. SUMMARY

[0010] The present application aims to solve at least one of the technical problems existing in the prior art or related art, and provides a thickened oil huff and puff development closed gathering and transportation method and device based on a liquid holdup rate equalizer, which can effectively solve the problems of oil and gas odor pollution and safety risks caused by unorganized discharge in the conventional open gathering and transportation process of the existing thickened oil huff and puff development block, and has the characteristics of simple process flow and strong working condition adaptability, and has good adaptability to the closed gathering and transportation of the thickened oil huff and puff development working condition with low steam carrying capacity.

[0011] In order to achieve the above technical purposes, the present application adopts the following technical solutions:

[0012] A thickened oil huff and puff development closed gathering and transportation method based on a liquid holdup rate equalizer, the method comprising the following steps:

[0013] Gathering oil: the produced liquid of a plurality of thickened oil huff and puff development oil production wells enters a metering station for produced liquid gathering and single well metering;

[0014] Closed transportation: the produced liquid of a plurality of metering stations is transported to a closed transfer device through a pipeline;

[0015] Gas-liquid equalization: the incoming liquid of the closed transfer device enters a liquid holdup rate equalizer for gas-liquid equalization adjustment;

[0016] Mixed transportation and pressure boosting: after the buffering and adjustment of the liquid holdup rate equalizer, the produced liquid enters a mixed transportation pump under the interlocking control of a pressure transmitter and a frequency converter, and is transported to a centralized treatment station or a joint station for crude oil treatment after being boosted by the mixed transportation pump.

[0017] In addition, the present application provides a thickened oil huff and puff development closed gathering and transportation device based on a liquid holdup rate equalizer, which is used to implement the above-mentioned thickened oil huff and puff development closed gathering and transportation method based on a liquid holdup rate equalizer, and comprises a plurality of thickened oil huff and puff development oil production wells, a metering station, a closed transfer device and a crude oil treatment station which are sequentially connected by pipelines;

[0018] The closed transfer device comprises a liquid holdup rate equalizer and a mixed transportation and pressure boosting device which is in communication with the liquid holdup rate equalizer, and the liquid holdup rate equalizer is used to transport the gas-liquid equalization adjusted liquid of the closed transfer device to the mixed transportation and pressure boosting device;

[0019] The mixed-conveyance booster device comprises a pressure transmitter, a frequency converter and a mixed-conveyance pump; the produced liquid is buffered and adjusted by the liquid holdup rate equalizer, then enters the mixed-conveyance pump through the interlocking control of the pressure transmitter and the frequency converter, and is boosted by the mixed-conveyance pump to be externally output to a centralized treatment station or a joint station for crude oil treatment;

[0020] The liquid holdup rate equalizer comprises an inlet, an outlet, an equalizing liquid distribution pipe and a buffer cavity; the inlet is arranged at one side of the buffer cavity, and the outlet is arranged at the bottom end of the buffer cavity; the equalizing liquid distribution pipe is located in the buffer cavity, and the lower end of the equalizing liquid distribution pipe is communicated with the outlet at the bottom end of the buffer cavity.

[0021] Further, the equalizing liquid distribution pipe of the liquid holdup rate equalizer is in a cylindrical structure, and the outer wall of the cylinder is uniformly provided with sieve holes from top to bottom.

[0022] Further, the shape of the sieve hole includes a square, a rectangle or a circle, and the size, number and arrangement spacing of the sieve hole are set according to actual mixed-conveyance needs.

[0023] Further, the outlet of the liquid holdup rate equalizer is connected with the mixed-conveyance pump through a pipeline; the mixed-conveyance pump is connected with a frequency converter, and a pressure transmitter is arranged on the pipeline between the outlet of the liquid holdup rate equalizer and the mixed-conveyance pump; the pressure transmitter is signal-connected with the frequency converter; the pressure transmitter feeds back the monitored liquid pressure before the pump to the frequency converter, and the frequency converter dynamically adjusts and controls the output flow of the mixed-conveyance pump.

[0024] Further, the inlet is arranged at one side of the upper end in the buffer cavity.

[0025] Further, the liquid holdup rate equalizer further comprises a support base, the buffer cavity is fixedly arranged on the support base, and the support base comprises support legs at two sides and a base at the bottom.

[0026] Further, the closed transfer device is connected with an instrument control cabinet, a power distribution cabinet and a frequency converter cabinet together, overall skid assembly pipeline design is performed, and integration is realized as a mobile and relocatable integrated device.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] (1) The liquid holdup rate equalizer of the present application can realize self-balancing regulation of gas and liquid, and the gas and liquid are automatically buffered and separated in the buffer cavity of the liquid holdup rate equalizer, and then the gas-liquid interface is self-balanced and regulated under a certain pressure (0.3-0.6 MPa) through the equalizing liquid distribution pipe, and the number and flow area of the gas outlet and liquid outlet flow holes are changed through the self-balancing regulation of the gas-liquid interface, so that the gas and liquid are evenly introduced into the rear-end mixed-transport pump after being buffered and rectified, thereby realizing self-balancing mixed-phase output of the gas and liquid, eliminating the gas-liquid slug phenomenon, avoiding the high-temperature failure of the mixed-transport pump caused by the high gas phase slug, and playing a role in stabilizing the liquid level and ensuring the liquid holdup rate of the mixed-transport pump (i.e., under the mixed-transport working condition, a part of the liquid phase is maintained to pass through the pump to avoid dry pumping of the pump);

[0029] (2) The closed gathering and transportation device of the present application has simple overall process flow and strong working condition adaptability, and has good adaptability to the closed gathering and transportation of the heavy oil huff and puff development working condition with low steam carrying capacity, can adapt to a maximum of 5% steam carrying capacity in produced liquid, and can adapt to a maximum of 1:20 gas-liquid ratio working condition; at the same time, the closed gathering and transportation device of the present application has small occupied area, and can reduce the occupied area by about 400 m 2 , compared with the traditional open gathering and transportation, and is more economical and implementable for dispersed and remote blocks;

[0030] (3) The liquid holdup rate equalizer of the present application uses a mechanical structure to replace the traditional liquid level and pressure control system, and compared with the traditional separator, the buffer separation effect is equivalent, and the engineering investment can be reduced by more than 80%, thereby significantly reducing the production investment cost;

[0031] (4) The closed gathering and transportation device of the present application is convenient for skid design, and the closed connection device in the present application is connected with basic devices such as an instrument control cabinet, a power distribution cabinet and a frequency converter cabinet, and the whole is designed as a skid assembly pipe, integrated into a mobile and relocatable integrated device, the device is easy to relocate and maintain after being skid-mounted, can be used multiple times in different places, and saves the whole life cycle engineering investment. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a heavy oil huff and puff development closed gathering and transportation method flowchart of the embodiment of the present application;

[0033] Figure 2 It is a structure schematic diagram of the liquid holdup rate equalizer of the embodiment of the present application;

[0034] Figure 3 It is a structure schematic diagram of the equalizing liquid distribution pipe of the embodiment of the present application;

[0035] Mark explanation in the figure: 1-liquid holdup rate equalizer; 2-pressure transmitter; 3-mixed-transport pump; 4-frequency converter; 101-liquid inlet; 102-liquid outlet; 103-equalizing liquid distribution pipe; 104-buffer cavity; 105-leg; 106-base. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0037] Embodiment 1

[0038] The embodiments of the present application provide a thickened oil huff and puff development closed gathering and transportation method based on a holdup rate equalizer, which combines the advantages of the thickened oil huff and puff development closed gathering and transportation method and the open gathering and transportation method. Figure 1 As shown in the figure, the specific steps of the method are as follows:

[0039] Gathering: The produced liquid of 6-15 thickened oil huff and puff development production wells enters a metering station to gather and meter the produced liquid of each well.

[0040] Closed transportation: The produced liquid of 1-6 metering stations is transported to a closed transfer device through a pipeline.

[0041] Gas-liquid equalization: The liquid entering the closed transfer device enters a holdup rate equalizer 1 to perform gas-liquid equalization adjustment.

[0042] Mixed transportation and pressure boosting: After the buffer adjustment of the holdup rate equalizer 1, the produced liquid enters a mixed transportation pump 3 through interlocking control of a pressure transmitter 2 and a frequency converter 4, and is boosted by the mixed transportation pump 3 to be transported to a centralized treatment station or a joint station for crude oil treatment.

[0043] The thickened oil huff and puff development closed gathering and transportation method provided by the embodiments of the present application is compared with the traditional open gathering and transportation method, and the comparison results are shown in Table 1. As can be seen from Table 1, the closed gathering and transportation device of the embodiments of the present application has a simple overall process flow and strong working condition adaptability, has good adaptability for the closed gathering and transportation of the thickened oil huff and puff development working condition with low steam carrying capacity, can adapt to the working condition with a maximum steam carrying capacity of 5% in the produced liquid and a maximum gas-liquid ratio of 1:20; at the same time, the closed gathering and transportation device of the embodiments of the present application has a small occupied area, and compared with the traditional open gathering and transportation, the occupied area can be reduced by about 400 m 2 , which is more economical and implementable for scattered and remote blocks.

[0044] Table 1 Technical Comparison Table

[0045]

[0046] Embodiment 2

[0047] The embodiments of the present application provide a device capable of realizing the thickened oil huff and puff development closed gathering and transportation method based on the holdup rate equalizer in Embodiment 1. As shown in the figure,Figure 1 As shown, the device comprises a plurality of thickened oil huff and puff development oil wells, a metering station, a closed transfer device and a crude oil processing station connected in sequence through pipelines;

[0048] The closed transfer device comprises a liquid holdup rate equalizer and a mixed transportation booster device in communication with the liquid holdup rate equalizer, and the liquid holdup rate equalizer is used to transport the liquid from the closed transfer device to the mixed transportation booster device after gas-liquid equalization adjustment;

[0049] The mixed transportation booster device comprises a pressure transmitter 2, a frequency converter 4 and a mixed transportation pump 3; after the produced liquid is buffered and adjusted by the liquid holdup rate equalizer, it is controlled by the pressure transmitter 2 and the frequency converter 4 in series to enter the mixed transportation pump 3, and then is boosted by the mixed transportation pump 3 to be transported to the centralized processing station or the joint station for crude oil processing.

[0050] The core of the closed gathering process is the liquid holdup rate equalizer, which mainly consists of a buffer cavity 104 and an equalization liquid distribution pipe 103. Figure 2 As shown, the liquid holdup rate equalizer comprises a support base, an inlet 101, an outlet 102, an equalization liquid distribution pipe 103 and a buffer cavity 104; the inlet 101 is arranged at one side of the upper middle end of the buffer cavity 104, and can be arranged at 2 / 3-4 / 5 of the height of the buffer cavity 104 to ensure that there is enough height space for the liquid phase interface, so as to avoid the liquid phase covering the gas phase and hindering the gas-liquid buffer separation; the outlet 102 is arranged at the bottom end of the buffer cavity 104; the buffer cavity 104 is fixedly arranged on the support base; the support base comprises support legs 105 on both sides and a base 106 at the bottom; the equalization liquid distribution pipe 103 is located in the buffer cavity 104, with an upper end opening and a lower end communicating with the outlet 102 at the bottom end of the buffer cavity 104. Figure 3 As shown, the equalization liquid distribution pipe 103 of the liquid holdup rate equalizer is a cylindrical structure, the outer wall of the cylinder is uniformly distributed with sieve holes 1031 from top to bottom, the shape of the sieve holes includes square, rectangular or circular, and the size, number and arrangement spacing of the sieve holes 1031 are set according to actual mixed transportation needs.

[0051] In the embodiment of the present application, the liquid outlet 102 of the liquid holdup equalizer is connected to the mixed delivery pump 3 through a pipeline, the mixed delivery pump 3 is connected to the frequency converter 4, and the pressure transmitter 2 is arranged on the pipeline between the liquid outlet 102 of the liquid holdup equalizer and the mixed delivery pump 3; the pressure transmitter 2 is signal connected to the frequency converter 4; the pressure transmitter 2 feeds back the monitored pre-pump liquid pressure to the frequency converter 4, and the frequency converter 4 dynamically adjusts and controls the output flow of the mixed delivery pump 3. Specifically, when the amount of gas-liquid mixed phase before the pump increases, the pre-pump liquid pressure monitored by the pressure transmitter increases, the frequency converter controlled by the pressure transmitter increases the frequency, thereby increasing the output flow of the pump; when the amount of gas-liquid mixed phase before the pump decreases, the pre-pump liquid pressure monitored by the pressure transmitter decreases, the frequency converter controlled by the pressure transmitter decreases the frequency, thereby reducing the output flow of the pump; through the above-mentioned frequency conversion pressure adjustment of the pump to respond to the change of the liquid, the stable operation of the system is maintained, and the phenomena of pressure blocking (the liquid cannot be output in time) and dry pumping (the liquid is very little and the pump is idling) of the pump caused by the change of the liquid are avoided.

[0052] When the liquid holdup equalizer works, the mixed gas-liquid enters the buffer cavity 104 through the liquid inlet 101 to be automatically buffered and separated, so that the gas enters the equalization liquid distribution pipe 103 from the upper end screen hole of the equalization liquid distribution pipe 103, and the liquid enters the equalization liquid distribution pipe 103 from the lower end screen hole of the equalization liquid distribution pipe 103. Under the self-balancing adjustment of the equalization liquid distribution pipe 103, the gas-liquid interface is self-balanced and adjusted at a certain pressure (0.3-0.6 MPa), the number of gas-liquid interface self-balancing adjustment changes the number and flow area of the gas and liquid flow through holes, and the gas and liquid are uniformly introduced into the rear-end mixed delivery pump after being buffered and rectified, so as to realize the self-balancing mixed phase output of the gas and liquid, eliminate the gas-liquid slug phenomenon, avoid the high-temperature failure of the mixed delivery pump caused by the high gas phase slug, and stabilize the liquid level and ensure the liquid holdup rate of the mixed delivery pump.

[0053] The structural and functional characteristics of the liquid holdup equalizer are as follows:

[0054] 1) When the amount of liquid is large and the amount of gas is small, the liquid in the buffer cavity 104 is at a high liquid level, the contact area between the equalization liquid distribution pipe 103 and the liquid phase increases, the number and area of the liquid phase flow screen holes increase, and the liquid discharge speed is accelerated;

[0055] 2) When the amount of liquid is small and the amount of gas is large, the liquid in the buffer cavity 104 is at a low liquid level, the contact area between the equalization liquid distribution pipe 103 and the liquid phase decreases, the number and area of the liquid phase flow screen holes decrease, the liquid discharge speed is effectively controlled, and the bottom end always has liquid phase entering the rear-end mixed delivery pump 3, which can effectively avoid the dry grinding of the mixed delivery pump 3;

[0056] 3) According to the specific working condition of the liquid (temperature, pressure, gas-liquid ratio, etc.), the screen size and arrangement spacing of the liquid holdup rate equalization pipe 1 are set, the functional relationship between the liquid quantity, gas quantity, leakage flow rate, buffer time and liquid holdup rate is established, the relative stability of the liquid quantity into the pump is ensured, and the fluid into the mixed delivery pump 3 always has a certain liquid holdup rate (the liquid holdup rate is also called the true liquid content rate or the cross-sectional liquid content rate, which refers to the proportion of the liquid phase flow cross-sectional area to the total flow area in the water-gas two-phase flow process); Specifically, taking the total length L of the equalization liquid distribution pipe 103, the ring wall of the pipeline with N screen holes per unit length, and the area of each screen hole s as an example, when the gas-liquid interface is at L1 position, the total leakage area of the upper gas phase is S1, S1=(L-L1)*N*s; the total leakage area of the lower liquid phase is S2, S2=L1*N*s, the fluctuation of the gas-liquid interface is the height change of L1, the equalization liquid distribution pipe 103 changes the leakage area of the gas and liquid phases by automatic adjustment, so as to realize the relative uniform mixing and output of the gas and liquid phases.

[0057] The liquid holdup rate equalizer of the mechanical structure in the embodiment of the application replaces the traditional liquid level and pressure control system, and compared with the traditional separator, under the condition that the buffer separation effect is equivalent, the engineering investment can be reduced by more than 80%, and the production investment cost is significantly reduced.

[0058] Embodiment 3

[0059] In the embodiment of the application, the closed transfer equipment in the above-mentioned embodiment 2 is connected with basic equipment such as an instrument control cabinet, a power distribution cabinet and a frequency converter cabinet, overall skid assembly pipe design is carried out, and integration is realized as a mobile and relocatable integrated device.

[0060] After the closed gathering and transportation device in the embodiment of the application is designed as a skid, relocation and maintenance are easy, the device can be used repeatedly in different places, and the whole life cycle engineering investment is saved.

[0061] The above description is only the preferred embodiment of the application, and does not limit the application in any form. Although the preferred embodiment of the application is described above, it is not intended to limit the application. Any person with ordinary knowledge in the art can make some changes or modifications to the above-mentioned technical content to obtain equivalent embodiments with equivalent changes, as long as the changes do not deviate from the technical solution of the application. Any modification, equivalent change and modification improvement of the above-mentioned embodiments according to the technical essence of the application shall be included in the protection scope of the application.

Claims

1. A closed-loop gathering and transportation system for heavy oil production based on a liquid holdup equalizer, the system comprising a plurality of heavy oil production wells, a metering station, a closed transfer device, and a crude oil processing station connected sequentially by pipelines, characterized in that, The closed transfer device includes a liquid holdup equalizer and a mixed-transport pressurization device connected to the liquid holdup equalizer. The liquid holdup equalizer is used to adjust the gas-liquid balance of the liquid coming into the closed transfer device and then transport it to the mixed-transport pressurization device. The mixed-transmission booster equipment includes a pressure transmitter, a frequency converter, and a mixed-transmission pump; After being buffered and regulated by the liquid holdup equalizer, the produced fluid enters the mixed transport pump through the interlocking control of the pressure transmitter and frequency converter. The mixed transport pump then pressurizes and transports the fluid to a centralized processing station or combined station for crude oil processing. The liquid holding capacity equalizer includes an inlet, an outlet, a liquid distribution pipe, and a buffer chamber; the inlet is located on one side of the buffer chamber, and the outlet is located at the bottom of the buffer chamber; the liquid distribution pipe is located in the buffer chamber, and the lower end of the liquid distribution pipe is connected to the outlet at the bottom of the buffer chamber. The liquid distribution tube of the liquid holding rate equalizer is a cylindrical structure, and the outer wall of the cylinder is evenly distributed with sieve holes from top to bottom.

2. The apparatus according to claim 1, characterized in that, The shape of the sieve holes includes square, rectangular or circular, and the size, number and spacing of the sieve holes are set according to the actual mixing and conveying needs.

3. The apparatus according to claim 1, characterized in that, The outlet of the liquid holdup equalizer is connected to the mixed-transfer pump via a pipeline; the mixed-transfer pump is externally connected to a frequency converter, and a pressure transmitter is installed on the pipeline between the outlet of the liquid holdup equalizer and the mixed-transfer pump; the pressure transmitter is signal-connected to the frequency converter; the pressure transmitter feeds back the monitored inlet liquid pressure to the frequency converter, which dynamically adjusts and controls the output flow of the mixed-transfer pump.

4. The apparatus according to claim 1, characterized in that, The liquid inlet is located on the upper side of the buffer cavity.

5. The apparatus according to any one of claims 1-4, characterized in that, The liquid holdup equalizer also includes a support base, and the buffer cavity is fixedly mounted on the support base. The support base includes legs on both sides and a base at the bottom.

6. The apparatus according to any one of claims 1-4, characterized in that, The sealed transfer device is connected to the instrument control cabinet, power distribution cabinet and frequency converter cabinet, and the whole is designed with skid-mounted pipe assembly, integrating it into a mobile and relocatable integrated device.

7. A closed-loop gathering and transportation method for heavy oil throughput based on a liquid holdup equalizer, characterized in that, The method is implemented using the closed-loop gathering and transportation device for heavy oil throughput development based on the liquid holdup equalizer as described in claim 1, and includes the following steps: Oil collection: The produced fluid from several heavy oil wells is collected at the metering station for individual well metering. Closed-loop transport: The produced fluid from several metering stations is transported via pipelines to a closed-loop transfer device. Gas-liquid balance: Liquid from the sealed transfer equipment enters the liquid holdup equalizer for gas-liquid balance adjustment; Mixed transport pressurization: After being buffered and regulated by the liquid holdup equalizer, the produced fluid enters the mixed transport pump through the interlocking control of the pressure transmitter and frequency converter. The mixed transport pump pressurizes the fluid and transports it to the centralized processing station or combined station for crude oil processing.

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