A combined skid-mounted oilfield water treatment plant

Abstract

The application provides a combined pry-mounted oilfield water treatment device, comprising: at least one core treatment pry block for mounting at least one oilfield water treatment process unit, at least one auxiliary system pry block for mounting at least one auxiliary system, and a detachable connecting mechanism, wherein the core treatment pry block is connected with the auxiliary system pry block through the connecting mechanism. The oilfield water treatment device with the modular and pry-mounted design realizes rapid deployment, flexible transfer and convenient maintenance of the oilfield water treatment device. The pry block is convenient for repeated use, and the construction period is shortened. Different functional pry blocks can be flexibly selected and combined according to the water quality characteristics and treatment scale of different oilfields. The system upgrading or modification can be easily realized by adding or replacing pry blocks.

Description

Technical Field

[0001] This invention relates to the field of oilfield produced water treatment equipment, and in particular to a combined skid-mounted oilfield water treatment equipment. Background Technology

[0002] During oilfield extraction, a large amount of produced water is generated. This wastewater must be effectively treated before it can be reinjected into the formation or discharged in compliance with standards. Traditional oilfield water treatment plants are typically constructed using reinforced concrete structures, which have the following significant drawbacks:

[0003] 1. Long construction period: Civil construction, equipment installation and pipeline laying take months or even years, which cannot meet the needs of rapid production in oil fields.

[0004] 2. High investment costs: The on-site construction work involves a large amount of manpower and material resources, and is greatly affected by the region and climate.

[0005] 3. Poor flexibility: The fixed structure cannot be moved. When an oilfield block is exhausted or the water volume changes, the treatment facility is abandoned, resulting in a waste of resources.

[0006] 4. Difficulty in maintenance and upgrading: The equipment layout is fixed and the space is compact, making it very inconvenient to inspect, replace or upgrade the core components or the process.

[0007] While existing technologies include individual skid-mounted devices such as skid-mounted filters or dosing units, they typically offer limited functionality and fail to address all issues from the perspective of the entire treatment system. A key technical challenge in this field is how to highly integrate the entire water treatment system (including units for oil removal, suspended solids removal, silica removal, and softening) while simultaneously meeting the requirements for rapid deployment, flexible allocation, and easy maintenance. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a combined skid-mounted oilfield water treatment equipment to address the shortcomings of the prior art.

[0009] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A combined skid-mounted oilfield water treatment equipment includes: at least one core treatment skid for installing at least one of a hydrocyclone separator, an air flotation machine, a filter module, a softening device, and a membrane treatment system; at least one auxiliary system skid for installing at least one of a dosing system, a power system, a control system, and an instrument monitoring system; and a detachable connecting mechanism. The core treatment skid is connected to the auxiliary system skid through the connecting mechanism. The connecting mechanism consists of a structural quick-connect flange and an integrated electro-hydraulic plug-in interface. The hydrocyclone separator is connected to the air flotation machine, the air flotation machine is connected to the filter module, the filter module is connected to the softening device, and the softening device is connected to the membrane treatment system. The dosing system is connected to the hydrocyclone separator, the air flotation machine, the filter module, and the softening device respectively. The power system is connected to the hydrocyclone separator, the air flotation machine, the filter module, the softening device, and the membrane treatment system respectively. The control system is connected to the dosing system, the power system, and the instrument monitoring system respectively. The instrument monitoring system is connected to the dosing system.

[0010] The beneficial effects of adopting the technical solution of this invention are as follows: The modular, skid-mounted design of the oilfield water treatment equipment enables rapid deployment, flexible transportation, and convenient maintenance. It facilitates the reuse of skids, shortening the construction cycle. Different functional skids can be flexibly selected and combined according to the water quality characteristics and treatment scale of different oilfields. System upgrades or modifications can be easily achieved by adding or replacing skids.

[0011] Furthermore, the dimensions of the core processing skid and the auxiliary system skid are adapted to the dimensions of the container used to transport the core processing skid and the auxiliary system skid; the core processing skid and the auxiliary system skid are independent functional skids.

[0012] The advantages of adopting the above-mentioned further technical solution are: each skid is a standard container-sized structure, which facilitates the transportation of functional skids. Two independent functional skids are assembled through a field quick-connect system, enabling rapid deployment, flexible relocation, and convenient maintenance of oilfield water treatment equipment.

[0013] Furthermore, the connection mechanism includes a structural quick-connect flange and an integrated electro-hydraulic plug-in interface, and the core processing skid is connected to the auxiliary system skid through the structural quick-connect flange and the integrated electro-hydraulic plug-in interface.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that the connection between pipes and lines is achieved through structural quick-connect flanges and integrated electro / hydraulic plug-in interfaces between each skid.

[0015] Furthermore, the structural quick-connect flange is a flat flange or a flange flange with a locating pin and a clamp.

[0016] The beneficial effects of adopting the above-mentioned further technical solutions are: the structural quick-connect flange is a flat flange or flange flange with locating pins and clamps, which ensures that the skids can be automatically corrected and aligned when docking.

[0017] Furthermore, the integrated electro-hydraulic plug-in interface includes a power cable, a signal line, and a hydraulic line, wherein the hydraulic line is a flexible hose or a rigid pipe with universal joint compensation.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that the core processing skid and the auxiliary system skid are finally connected by a flexible hose or a rigid tube with universal joint compensation to allow for minor alignment errors.

[0019] Furthermore, both the core processing skid and the auxiliary system skid are provided with inspection channels, which are arranged along the operating surfaces of the equipment in the core processing skid and the auxiliary system skid.

[0020] The beneficial effects of adopting the above-mentioned further technical solution are: a centralized inspection channel is provided inside the skid, which is arranged along the main operating surface of the equipment, facilitating the inspection of the internal equipment. The centralized inspection channel ensures that operators can safely and conveniently access all major equipment for daily inspections.

[0021] Furthermore, the width of the inspection channel is not less than 600mm, and the equipment on both sides of the inspection channel is equipped with front operation and maintenance doors.

[0022] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the inspection passage width is not less than 600mm, and both sides of the passage are equipped with front operation and maintenance doors. These doors avoid the difficulties of traditional equipment requiring maintenance from confined spaces or the top, facilitating internal equipment inspections. The centralized inspection passage ensures that operators can safely and conveniently access all major equipment for daily inspections.

[0023] Furthermore, when the auxiliary system is a control system skid, the control system skid is equipped with a SCADA system and a wireless communication module, and the SCADA system is electrically connected to the wireless communication module.

[0024] The beneficial effects of adopting the above-mentioned further technical solutions are: the control system skid integrates a SCADA system and is equipped with a wireless communication module, which can realize remote monitoring and fault diagnosis.

[0025] Furthermore, the top of both the core processing skid and the auxiliary system skid are connected by hinges or quick-release bolts to a top cover or multiple maintenance covers that can be opened as a whole; both the core processing skid and the auxiliary system skid are equipped with a prefabricated frame inside the skid for fixing and supporting internal equipment and pipelines.

[0026] The beneficial effects of adopting the above-mentioned further technical solution are: the top of the skid is equipped with a top cover or multiple large maintenance covers that can be opened as a whole, and the top cover or covers are fixed by hinges or quick-release bolts. The openable top cover or large maintenance covers greatly facilitate the hoisting and replacement of large internal components, and greatly reduce maintenance time and costs.

[0027] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is one of the process flow diagrams for the combined skid-mounted oilfield water treatment equipment provided in the embodiments of the present invention.

[0030] Figure 2 This is the second process flow diagram of the combined skid-mounted oilfield water treatment equipment provided in the embodiments of the present invention.

[0031] Figure 3 This is one of the structural schematic diagrams of the combined skid-mounted oilfield water treatment equipment provided in an embodiment of the present invention.

[0032] Figure 4 This is the second structural schematic diagram of the combined skid-mounted oilfield water treatment equipment provided in an embodiment of the present invention.

[0033] Figure 5 This is the third structural schematic diagram of the combined skid-mounted oilfield water treatment equipment provided in the embodiments of the present invention.

[0034] Figure 6 The fourth schematic diagram of the combined skid-mounted oilfield water treatment equipment provided in the embodiments of the present invention.

[0035] Figure 7 The fifth schematic diagram of the combined skid-mounted oilfield water treatment equipment provided in the embodiments of the present invention.

[0036] Figure 8 This is the sixth structural schematic diagram of the combined skid-mounted oilfield water treatment equipment provided in the embodiments of the present invention. Detailed Implementation

[0037] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0043] like Figures 3 to 8As shown, an embodiment of the present invention provides a combined skid-mounted oilfield water treatment equipment, including: at least one core treatment skid for installing at least one oilfield water treatment process unit, at least one auxiliary system skid for installing at least one auxiliary system, and a detachable connecting mechanism, wherein the core treatment skid is connected to the auxiliary system skid through the connecting mechanism.

[0044] The beneficial effects of adopting the technical solution of this invention are as follows: The modular, skid-mounted design of the oilfield water treatment equipment enables rapid deployment, flexible transportation, and convenient maintenance. It facilitates the reuse of skids, shortening the construction cycle. Different functional skids can be flexibly selected and combined according to the water quality characteristics and treatment scale of different oilfields. System upgrades or modifications can be easily achieved by adding or replacing skids.

[0045] This invention relates to the field of oilfield produced water treatment technology, specifically to an oilfield water treatment equipment with a modular, skid-mounted design, particularly suitable for remote, dispersed oilfields or operating areas requiring rapid production. This invention provides a combined skid-mounted oilfield water treatment equipment, designed to address the shortcomings of traditional fixed water treatment stations, such as long construction cycles, high investment, and immobility. It also overcomes the limitations of single skid-mounted equipment in terms of limited processing capacity and low system integration, enabling rapid deployment, flexible transportation, and convenient maintenance of oilfield water treatment equipment.

[0046] This invention provides a combined skid-mounted oilfield water treatment equipment, which is assembled from at least two independent functional skids through a field quick-connect system; the functional skids include a core treatment skid and an auxiliary system skid.

[0047] The core processing skid integrates at least one water treatment process unit.

[0048] The auxiliary system skid integrates at least one auxiliary system.

[0049] Each skid is a standard container-sized structure with a uniform structural quick-connect flange and integrated electro / hydraulic plug-in interface on the outside. The internal equipment and pipelines are fixedly supported by a prefabricated frame inside the skid.

[0050] The various skids are connected to each other via structural quick-connect flanges and integrated electro / hydraulic plug-in interfaces to enable the connection of pipes and lines.

[0051] Structural quick-connect flanges are flat flanges or flange flanges with locating pins and clamps.

[0052] The skid has a central inspection channel inside, which is arranged along the main operating surface of the equipment and is no less than 600mm wide. Both sides of the equipment are equipped with front operation and maintenance doors.

[0053] The top of the skid is equipped with a top cover that can be opened as a whole or multiple large inspection covers.

[0054] The core processing skid and the auxiliary system skid are ultimately connected by a flexible hose or a rigid tube with universal joint compensation.

[0055] The auxiliary system skid is a control system skid that integrates a SCADA system and is equipped with a wireless communication module.

[0056] This invention provides a modular skid-mounted oilfield water treatment equipment, relating to the field of oilfield water treatment technology. The equipment is assembled from at least two independent functional skids via a field quick-connect system. Each skid includes a core treatment skid integrating the water treatment process unit and an auxiliary system skid integrating the auxiliary system. Each skid is of standard container size, externally equipped with a standardized structural quick-connect flange and integrated electro / hydraulic plug-in interface, and internally fixed and supported by a prefabricated frame. This invention, through its modular and standardized skid-mounted design, achieves rapid transportation, convenient installation, flexible combination, and efficient maintenance of the oilfield water treatment equipment. It is particularly suitable for remote oilfields and those requiring rapid commissioning, effectively overcoming the inherent defects of traditional fixed water treatment stations.

[0057] Furthermore, the dimensions of the core processing skid and the auxiliary system skid are adapted to the dimensions of the container used to transport the core processing skid and the auxiliary system skid; the core processing skid and the auxiliary system skid are independent functional skids.

[0058] The advantages of adopting the above-mentioned further technical solution are: each skid is a standard container-sized structure, which facilitates the transportation of functional skids. Two independent functional skids are assembled through a field quick-connect system, enabling rapid deployment, flexible relocation, and convenient maintenance of oilfield water treatment equipment.

[0059] Furthermore, the connection mechanism includes a structural quick-connect flange and an integrated electro-hydraulic plug-in interface, and the core processing skid is connected to the auxiliary system skid through the structural quick-connect flange and the integrated electro-hydraulic plug-in interface.

[0060] The beneficial effect of adopting the above-mentioned further technical solution is that the connection between pipes and lines is achieved through structural quick-connect flanges and integrated electro / hydraulic plug-in interfaces between each skid.

[0061] Furthermore, the structural quick-connect flange is a flat flange or a flange flange with a locating pin and a clamp.

[0062] The beneficial effects of adopting the above-mentioned further technical solutions are: the structural quick-connect flange is a flat flange or flange flange with locating pins and clamps, which ensures that the skids can be automatically corrected and aligned when docking.

[0063] like Figures 3 to 8 As shown, the integrated electro-hydraulic plug-in interface further includes a power cable, a signal line, and a hydraulic line, wherein the hydraulic line is a flexible hose or a rigid pipe with universal joint compensation.

[0064] The beneficial effect of adopting the above-mentioned further technical solution is that the core processing skid and the auxiliary system skid are finally connected by a flexible hose or a rigid tube with universal joint compensation to allow for minor alignment errors.

[0065] like Figures 3 to 8 As shown, furthermore, both the core processing skid and the auxiliary system skid are provided with inspection channels, which are arranged along the operating surfaces of the equipment in the core processing skid and the auxiliary system skid.

[0066] The beneficial effects of adopting the above-mentioned further technical solution are: a centralized inspection channel is provided inside the skid, which is arranged along the main operating surface of the equipment, facilitating the inspection of the internal equipment. The centralized inspection channel ensures that operators can safely and conveniently access all major equipment for daily inspections.

[0067] Furthermore, the width of the inspection channel is not less than 600mm, and the equipment on both sides of the inspection channel is equipped with front operation and maintenance doors.

[0068] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the inspection passage width is not less than 600mm, and both sides of the passage are equipped with front operation and maintenance doors. These doors avoid the difficulties of traditional equipment requiring maintenance from confined spaces or the top, facilitating internal equipment inspections. The centralized inspection passage ensures that operators can safely and conveniently access all major equipment for daily inspections.

[0069] Furthermore, the oilfield water treatment process unit is one or more of a hydrocyclone separator, an air flotation machine, a filtration module, a softening device, or a membrane treatment system; the auxiliary system is one or more of a dosing system, a power system, a control system, or an instrument monitoring system.

[0070] The beneficial effects of adopting the above-mentioned further technical solutions are: it facilitates the integration of oilfield water treatment process units into the core treatment skid according to actual needs, and it facilitates the integration of auxiliary systems into the auxiliary system skid according to actual needs, thereby improving applicability and flexibility.

[0071] Furthermore, when the auxiliary system is a control system skid, the control system skid is equipped with a SCADA system and a wireless communication module, and the SCADA system is electrically connected to the wireless communication module.

[0072] The beneficial effects of adopting the above-mentioned further technical solutions are: the control system skid integrates a SCADA system and is equipped with a wireless communication module, which can realize remote monitoring and fault diagnosis.

[0073] Furthermore, the top of both the core processing skid and the auxiliary system skid are connected by hinges or quick-release bolts to a top cover or multiple maintenance covers that can be opened as a whole; both the core processing skid and the auxiliary system skid are equipped with a prefabricated frame inside the skid for fixing and supporting internal equipment and pipelines.

[0074] The beneficial effects of adopting the above-mentioned further technical solution are: the top of the skid is equipped with a top cover or multiple large maintenance covers that can be opened as a whole, and the top cover or covers are fixed by hinges or quick-release bolts. The openable top cover or large maintenance covers greatly facilitate the hoisting and replacement of large internal components, and greatly reduce maintenance time and costs.

[0075] Example 1:

[0076] This invention provides a combined skid-mounted oilfield water treatment device, which is assembled from at least two independent functional skids via a field quick-connect system. The functional skids include a core treatment skid and auxiliary system skids.

[0077] The core processing skid integrates at least one water treatment process unit, which includes, but is not limited to, one or more of a hydrocyclone oil separator, an air flotation machine, a filtration module, a softening device, or a membrane treatment system.

[0078] The auxiliary system skid integrates at least one auxiliary system, including but not limited to one or more of a dosing system, a power system, a control system, or an instrument monitoring system.

[0079] Each skid is a standard container-sized structure, with a uniform structural quick-connect flange and integrated electro / hydraulic plug-in interface on the outside. The internal equipment and piping are fixedly supported by a prefabricated frame inside the skid. Each skid is less than 3m wide, less than 3m high, and less than 18m long.

[0080] The various skids are connected to each other via structural quick-connect flanges and integrated electro / hydraulic plug-in interfaces to achieve pipe and line connections. The liquid phase interface can use a flange or a quick-connect plug. Explosion-proof plugs can be used for electrical connections.

[0081] Preferably, the structural quick-connect flange is a flat flange or flange flange with locating pins and clamps to ensure automatic correction and alignment when the skids are connected.

[0082] Preferably, the skid contains a centralized inspection channel, which is arranged along the main operating surface of the equipment and has a width of not less than 600mm. Both sides of the channel have front-facing operation and maintenance doors. The width of the inspection channel ranges from 800mm to 1000mm and is located on one or both sides of the equipment inside the skid. The main operating surface can be the side of the equipment requiring maintenance, parts replacement, or pressure checks.

[0083] Preferably, the top of the skid is provided with a top cover or multiple large maintenance covers that can be opened as a whole, and the top cover or covers are fixed by hinges or quick-release bolts.

[0084] Preferably, the core processing skid and the auxiliary system skid are finally connected by a flexible hose or a rigid tube with universal joint compensation to allow for minor alignment errors.

[0085] Preferably, the control system skid integrates a SCADA (Supervisory Control and Data Acquisition) system and is equipped with a wireless communication module, enabling remote monitoring and fault diagnosis. The SCADA system can be connected to electronic signal connectors for pressure, flow, and monitoring functions.

[0086] like Figures 3 to 8 As shown, Figure 3 The implementation in the diagram is a pipe connection, and the dashed line represents a circuit connection.

[0087] The core processing skid is a containerized core processing skid, and the auxiliary system skid is a containerized auxiliary system skid. The connection mechanism consists of a structural quick-connect flange and an integrated electro / hydraulic plug-in interface. The cyclone separator is connected to the air flotation machine, the air flotation machine is connected to the filter module, the filter module is connected to the softening device, and the softening device is connected to the membrane treatment system. The dosing system is connected to the cyclone separator, air flotation machine, filter module, and softening device. The power system is connected to the cyclone separator, air flotation machine, filter module, softening device, and membrane treatment system. The control system is connected to the dosing system, power system, and instrument monitoring system. The instrument monitoring system is connected to the dosing system.

[0088] Specifically, the hydrocyclone oil separator is connected to the air flotation machine: the outlet of the hydrocyclone oil separator is connected to the inlet of the air flotation machine through a pipe and flange to further remove suspended oil and fine oil droplets.

[0089] Air flotation separator connected to filtration module: Water treated by air flotation separator enters filtration module (such as multi-media filter, activated carbon filter, etc.) through pipe + quick connector to remove suspended solids and colloids.

[0090] The filter module (multi-media / activated carbon) is connected to the softening device: the filtered water enters the softening device (such as an ion exchanger) through a rigid pipe or flexible pipe + flange for hardness ion removal.

[0091] The softening unit (ion exchanger) is connected to the membrane treatment system (RO / UF / MF): the softened water enters the membrane treatment system (such as reverse osmosis or ultrafiltration) through a pressure-resistant pipe and clamp joint for deep desalination or separation.

[0092] Note: The above process units can be flexibly combined according to water quality requirements. All pipe connections between units use quick-connect flanges of the same diameter, which support quick on-site docking and disassembly.

[0093] The dosing system connects to various process units: The dosing system (metering pump / storage tank) is connected via metering pumps, hoses, and injection valves to: before the hydrocyclone separator (dosing demulsifier), before the air flotation machine (dosing flocculant), before the membrane treatment system (dosing scale inhibitor and disinfectant), and during the regeneration stage of the softening unit (dosing regeneration agents). The hoses can be used as chemical pipelines.

[0094] The power system connects to various electrical equipment: The power system (power distribution / frequency conversion) supplies power to the following equipment through explosion-proof cables and plug-in electrical interfaces: cyclone separator drive motor, air flotation machine blower and scraper, filter module backwash pump, softening unit regeneration pump, and membrane treatment system high-pressure pump and circulation pump.

[0095] The control system (SCADA / wireless) connects all system equipment: The control system (including the SCADA system) communicates with the following equipment via signal cables and junction boxes / wireless modules: pressure, flow, and water quality sensors in each process unit, metering pump controllers in the dosing system, power distribution cabinets and frequency converters in the power system, and data acquisition modules in the instrumentation and monitoring system.

[0096] The instrument monitoring system connects to the process and auxiliary systems: The instrument monitoring system (sensors / analyzers) is connected via signal lines and data buses to: the online water quality analyzer (oil content, turbidity, hardness, etc.) at the process unit outlet, flow meters on pipelines, pressure transmitters, level sensors in the dosing system, and the data receiving end of the control system.

[0097] Pipe connections: All use structural quick-connect flanges (with locating pins and clamps), supporting automatic alignment and quick locking.

[0098] Electrical connections: An integrated pluggable interface (explosion-proof plug / socket) is used, including power cable, control signal line, and grounding wire. Electrical connections are achieved via power / signal cables.

[0099] Hydraulic / pneumatic connection: uses hoses or rigid pipes with universal joints, allowing for minor alignment errors, and the interface is a quick-connect coupling.

[0100] Data connectivity: Centralized data monitoring is achieved using industrial buses (such as Modbus and Profibus) or wireless transmission modules.

[0101] Piping connections between process units: Each process unit is arranged in the order of the water treatment process, and the pipelines are connected through quick-connect flanges of the same diameter: the outlet of the hydrocyclone oil separator is connected to the inlet of the air flotation machine through a DN150 flange + clamp; the outlet of the air flotation machine is connected to the main inlet pipe of the filter module through a DN125 flange + clamp; the outlet of the filter module is connected to the inlet valve of the softening unit through a DN100 flange + clamp; the outlet of the softening unit is connected to the high-pressure pump inlet of the membrane treatment system through a DN80 flange + clamp.

[0102] All flange connections are equipped with locating pins and quick-locking clamps to ensure automatic alignment and reliable sealing during on-site connection.

[0103] Connection between auxiliary systems and process units: Dosing system connection: The dosing system has multiple dosing points, which are connected to the following via flexible hoses and quick-connect valves: Demulsifier dosing point: connected to the inlet pipe of the cyclone separator; Flocculant dosing point: connected to the inlet pipe of the air flotation machine; Scale inhibitor dosing point: connected to the inlet section of the membrane treatment system; Regenerant dosing point: connected to the regenerant inlet of the softening unit.

[0104] Power system connection: The power system supplies power to each process unit through explosion-proof cables and industrial connectors: Three-phase power cables (380V) connect the cyclone separator motor, air flotation blower, filter backwash pump, and membrane system high-pressure pump; control cables (24VDC) connect the electric valves, level switches, and pressure switches of each unit.

[0105] Control System Connection: The control system (SCADA) achieves signal acquisition and control through shielded twisted pair cables + terminal blocks / wireless transmission modules: Analog Input: connects to pressure transmitters, flow meters, and water quality analyzers of each process unit; Digital Output: connects to start / stop of dosing metering pumps, electric valve switches, and alarm indicator lights; Wireless Communication Module: uploads operating data to the cloud monitoring platform.

[0106] Instrument monitoring system connection: The instrument monitoring system is connected via signal cable and data acquisition unit: Online oil content analyzer: installed at the outlet of the hydrocyclone oil separator; Turbidity meter: installed at the outlet of the filter module; Online hardness monitor: installed at the outlet of the softening unit; Conductivity meter: installed on the product water side of the membrane system.

[0107] Overall interface layout between skids: Each skid has the following features at a uniform location on its side: a structural quick-connect flange (for process piping connection); an integrated electro / hydraulic plug-in interface box (containing a power socket, signal terminals, and hydraulic quick connectors); and positioning guide posts (to ensure skid alignment accuracy).

[0108] During on-site installation, simply bring the two skids close together, the guide column will automatically guide them into alignment, and then tighten the flange clamps and plug in the electro-hydraulic interface to complete the connection.

[0109] Figure 6 In this configuration, skid A has a pipe outlet (flange end) and a positioning hole, while skid B has a pipe inlet (flange end) and a positioning pin. The two skids can be connected by a quick-locking clamp (with handle / hydraulic locking).

[0110] Figure 7 The integrated interface box (IP67 protection rating) can be equipped with a power socket (3P), signal terminals (RJ45), hydraulic quick connectors (DN25), and pneumatic quick connectors (DN15). The power socket can be connected to a cable, the signal terminals can be connected to a network cable, the hydraulic quick connectors can be connected to a flexible hose, and the pneumatic quick connectors can be connected to an air hose.

[0111] Figure 8 In the process, pry bar A and pry bar B are hoisted into place, aligned and guided, and then locked together to complete the assembly.

[0112] Compared with the prior art, the present invention has the following significant advantages:

[0113] 1. Ultimate ease of transportation and installation: Utilizing standard container dimensions and standardized quick-connect interfaces, all skids can be transported long distances via standard land and sea transport. Upon arrival at the site, only simple skid alignment, flange connection, and plug docking are required to complete the main installation, reducing the construction cycle from the traditional months to just a few weeks.

[0114] 2. Unparalleled convenience for on-site maintenance and inspection: Centralized inspection access ensures that operators can safely and conveniently access all major equipment for daily inspections.

[0115] Front-facing operation and access doors eliminate the difficulties of traditional equipment requiring maintenance from confined spaces or the top.

[0116] The openable top cover or large access cover greatly facilitates the hoisting and replacement of large internal components (such as pumps and diaphragm housings), significantly reducing maintenance time and costs.

[0117] 3. High Flexibility and Scalability: Adopting a "Lego-like" modular design, different functional skids can be flexibly selected and combined according to the water quality characteristics and treatment scale of different oilfields. When process requirements change, system upgrades or modifications can be easily achieved by adding or replacing skids. The modular design facilitates disassembly and assembly.

[0118] 4. Maximize investment benefits: After the service of an oilfield block is completed, the entire set of equipment can be easily disassembled and transported to the next block for reuse, realizing the recycling of assets, avoiding the abandonment of fixed assets, and significantly reducing the total life cycle cost.

[0119] Example 2:

[0120] A combined skid-mounted system for treating produced water from heavy oil (combined skid-mounted oilfield water treatment system) is designed with a treatment capacity of 5000 m³ / d. It consists of the following skids:

[0121] 1. Oil removal skid: 40-foot standard container, with built-in cyclone oil remover and pipeline mixer.

[0122] 2. Dissolved air flotation filter skid: 40-foot standard container, with built-in dissolved air flotation machine and multi-media filter.

[0123] 3. Softening skid: 20-foot standard container, with built-in ion exchange softener and regeneration system.

[0124] 4. Utility skid: 20-foot standard container, integrating dosing device, control system and instrument ventilation system.

[0125] Installation process:

[0126] 1. On the pre-leveled site, use a crane to lift and place the four pry bars into position according to the process flow diagram. The process flow diagram is as follows: Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram of the combined skid-mounted system is shown. Figure 1 The following skids are available: Utility skids (compatible with 20-foot containers, including chemical dosing / control / power systems); Oil removal skids (compatible with 40-foot containers, including hydrocyclone oil separators); Air flotation filter skids (compatible with 40-foot containers, including air flotation unit and filter); and Softening skids (compatible with 20-foot containers, including ion exchangers). The oil removal skids can be detachably connected to the air flotation filter skids via quick-connect flanges and integrated interfaces. The air flotation filter skids can also be detachably connected to the softening skids via quick-connect flanges and integrated interfaces.

[0127] Figure 2 The internal layout of a single pry bar is shown. Figure 2In this configuration, a single skid structure may include: a structural quick-connect flange, a prefabricated frame inside the skid, a centralized inspection passage, an equipment area (front access control), and an openable top cover / access cover.

[0128] 2. Using tools such as pry bars and locating pins, operators align the structural quick-connect flanges of adjacent pry bars and quickly tighten them with clamps. The locating pins can be used to connect the two pry bars. This facilitates connection during installation, such as with a pagoda-style connector or a single-sided protruding insertion connection, eliminating the need for hoisting and adjustment. The clamps can be placed on the outside of the connection point for fixation, and the locking mechanism serves as a safety measure against loosening. The locking method is either a clamp or a quick-release threaded clamp.

[0129] 3. Connect the integrated electro-hydraulic plug-in interfaces (including power cables, signal lines, and hydraulic lines) of each skid.

[0130] 4. Use a small number of flexible hoses to connect pipe interfaces that are far apart or have slight misalignment.

[0131] 5. Connect the main power supply and perform debugging on the control system skid. The system is then ready for operation.

[0132] Maintenance scenario:

[0133] When the booster pump inside the air flotation filter skid needs to be replaced, the operator can:

[0134] The pump can be safely accessed through a centralized inspection channel.

[0135] Open the front access door and disconnect the pump's power supply and piping.

[0136] Open the large inspection cover at the corresponding position on the top of the skid, and use the on-site crane to lift out the old pump and lift in the new pump.

[0137] Reconnection and replacement complete. The entire process can be completed within hours without hot work or extensive dismantling of the piping.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined skid-mounted oilfield water treatment equipment, characterized in that, include: The system includes at least one core processing skid for installing a hydrocyclone separator, an air flotation machine, a filter module, a softening device, and a membrane treatment system; at least one auxiliary system skid for installing at least one of a dosing system, a power system, a control system, and an instrumentation monitoring system; and a detachable connecting mechanism. The core processing skid is connected to the auxiliary system skid via the connecting mechanism. The connecting mechanism consists of a structural quick-connect flange and an integrated electro-hydraulic plug-in interface. The hydrocyclone separator is connected to the air flotation machine, the air flotation machine is connected to the filter module, the filter module is connected to the softening device, and the softening device is connected to the membrane treatment system. The dosing system is connected to the hydrocyclone separator, the air flotation machine, the filter module, and the softening device, respectively. The power system is connected to the hydrocyclone separator, the air flotation machine, the filter module, and the softening device, respectively. The system is connected to the membrane treatment system, and the control system is connected to the dosing system, the power system, and the instrument monitoring system. The instrument monitoring system is connected to the dosing system. The dimensions of the core treatment skid and the auxiliary system skid are adapted to the dimensions of the container used to transport the core treatment skid and the auxiliary system skid. The core treatment skid and the auxiliary system skid are independent functional skids. The core treatment skid is connected to the auxiliary system skid through the structural quick-connect flange and the integrated electro-hydraulic plug-in interface. The structural quick-connect flange is a flat flange or a flange flange with locating pins and clamps. The integrated electro-hydraulic plug-in interface includes a power cable, a signal line, and a hydraulic line. The hydraulic line is a hose or a rigid pipe with universal joint compensation.

2. The combined skid-mounted oilfield water treatment equipment according to claim 1, characterized in that, Both the core processing skid and the auxiliary system skid are equipped with inspection channels, which are arranged along the operating surfaces of the equipment in the core processing skid and the auxiliary system skid.

3. The combined skid-mounted oilfield water treatment equipment according to claim 2, characterized in that, The width of the inspection channel is not less than 600mm, and the equipment on both sides of the inspection channel is equipped with front operation and maintenance doors.

4. The combined skid-mounted oilfield water treatment equipment according to claim 1, characterized in that, When the auxiliary system is a control system skid, the control system skid is equipped with a SCADA system and a wireless communication module, and the SCADA system is electrically connected to the wireless communication module.

5. A combined skid-mounted oilfield water treatment equipment according to claim 1, characterized in that, The top of the core processing skid and the top of the auxiliary system skid are both connected by hinges or quick-release bolts to a top cover or multiple maintenance covers that can be opened as a whole; both the core processing skid and the auxiliary system skid are equipped with a prefabricated frame inside the skid for fixing and supporting the internal equipment and pipelines.

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