Skid-mounted sulfur-containing sewage mixing desulfurization device for offshore oilfield

Abstract

The utility model provides a skid-mounted sulfur-containing sewage mixing and desulfurizing device for an offshore oilfield, which relates to the technical field of offshore oilfield sulfur-containing sewage treatment and comprises a skid-mounted frame, and a chemical mixing unit, a buffer unit, an external liquid discharging unit and a control unit are arranged on the skid-mounted frame. The chemical mixing unit comprises a liquid inlet manifold, a chemical adding plunger pump, a jet mixer and two pipeline mixers, the chemical adding plunger pump is connected with the liquid inlet manifold, and the outlet end of the chemical adding plunger pump is connected with the inlets of the jet mixer and the two pipeline mixers respectively; the buffer unit comprises a desulfurization tank and a turning plate liquid level meter mounted on the desulfurization tank, a liquid inlet manifold of the desulfurization tank is connected with the outlet end of the liquid inlet manifold, and the turning plate liquid level meter is connected with the control unit; the output liquid discharging unit comprises a centrifugal pump, and an output manifold and a liquid discharging manifold are arranged at an outlet of the centrifugal pump; the control unit comprises a circuit control box, the dosing plunger pump and the centrifugal pump are both electrically connected with the circuit control box, and the desulfurization device is high in integration level and good in desulfurization effect.

Description

Technical Field

[0001] This utility model relates to the field of sulfur-containing wastewater treatment technology in offshore oil fields, and in particular to a skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields. Background Technology

[0002] Some offshore oilfield wells produce fluids containing hydrogen sulfide. Due to the complex composition of oilfield production water, hydrogen sulfide can also be generated during platform process handling due to bacterial action. Hydrogen sulfide accumulates in the process or dissolves in the production water, corroding processes, steel, and equipment. Furthermore, it is easily volatilized into the air during production water use, affecting the safety of production workers.

[0003] Existing desulfurization devices typically use multiple desulfurization towers connected in parallel or series to achieve the required sulfur content after desulfurization. Their overall structure is complex and they occupy a large area. However, offshore platforms have limited space and concentrated personnel, so current desulfurization devices cannot meet the actual application needs of offshore platforms. Utility Model Content

[0004] The purpose of this invention is to provide a skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields. This addresses the problem that existing desulfurization devices typically employ multiple desulfurization towers connected in parallel or series to achieve the required sulfur content after desulfurization. These devices have complex overall structures and large footprints, while offshore platforms have limited space and concentrated personnel, thus current desulfurization devices cannot meet the practical application requirements of offshore platforms. The preferred technical solutions provided by this invention offer numerous technical advantages, which are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides a skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields, including a skid frame. The skid frame is equipped with a chemical mixing unit, a buffer unit, an external discharge unit, and a control unit, wherein:

[0007] The drug mixing unit includes an inlet manifold, a dosing plunger pump, a jet mixer, and two pipeline mixers. The dosing plunger pump is connected to the inlet manifold, and the outlet end of the dosing plunger pump is connected to the inlet of the jet mixer and the inlet of the two pipeline mixers, respectively.

[0008] The buffer unit includes a desulfurization tank and a flap level gauge installed on the desulfurization tank. The inlet manifold of the desulfurization tank is connected to the outlet end of the inlet manifold, and the flap level gauge is connected to the control unit.

[0009] The external discharge unit includes a centrifugal pump, and the outlet of the centrifugal pump is respectively provided with an external discharge manifold and a discharge manifold. The external discharge manifold is used for external discharge, and the discharge manifold is connected to the inlet manifold for secondary desulfurization through the desulfurization tank.

[0010] The control unit includes a circuit control box, and the dosing plunger pump and the centrifugal pump are both electrically connected to the circuit control box.

[0011] Preferably, the inlet manifold is provided with a connector, a butterfly valve, a pressure gauge, and an inlet flow meter in sequence along the direction of liquid flow, and the butterfly valve, the pressure gauge, and the inlet flow meter are all electrically connected to the circuit control box.

[0012] Preferably, the jet mixer and the two pipe mixers are each provided with independent manifolds and control valves, and the control valves are electrically connected to the circuit control box.

[0013] Preferably, the inlet manifold adopts a "T"-shaped structure, including a first manifold and a second manifold vertically connected to the center of the first manifold and communicating with the first manifold, wherein:

[0014] The second manifold extends from the outside of the desulfurization tank into the inside of the desulfurization tank;

[0015] The first manifold is located inside the desulfurization tank.

[0016] Preferably, a one-inch ball valve is installed on the bottom manifold of the liquid inlet manifold and the upper manifold of the liquid inlet manifold of the desulfurization tank before entering the tank, respectively, to connect to a one-inch pressure handle quick-connect inlet.

[0017] Preferably, the external discharge unit further includes an outlet flow meter, which is electrically connected to the control unit, wherein:

[0018] The external delivery manifold is connected to the outlet flow meter, and the drain manifold is connected to the inlet flow meter;

[0019] Both the external pipeline manifold and the drainage pipeline manifold are equipped with connectors, which are 2-inch 1502 female union connectors.

[0020] Preferably, the drug mixing unit further includes a hydrogen sulfide detection probe, which is located between the jet mixer and the pipeline mixer, and is electrically connected to the control unit.

[0021] Preferably, the desulfurization tank is equipped with:

[0022] A low-pressure one-way valve for introducing air from outside the desulfurization tank into the desulfurization tank;

[0023] A low-pressure check valve for venting hydrogen sulfide gas from the desulfurization tank;

[0024] And / or, a manual venting valve for venting the desulfurization tank.

[0025] Preferably, the centrifugal pump is a variable frequency horizontal centrifugal pump.

[0026] Preferably, the connector is a 2-inch 1502 male unibody connector.

[0027] The beneficial effects of this invention are as follows: By coordinating a chemical mixing unit, a buffer unit, an external discharge unit, and a control unit on the skid, liquid desulfurizing agent is injected into the production water in a closed system. The desulfurizing agent and sulfur-containing production water are thoroughly mixed in a closed system within the device. Desulfurization is achieved through thorough mixing and extended reaction time. The overall device has high integration, excellent desulfurization effect, simple operation, small footprint, convenient installation, and high safety performance. It solves the problem of excessive hydrogen sulfide in the production water of offshore oilfield production platforms, preventing its open use. It is environmentally friendly, producing no pollutants or hazardous chemicals, and meets the requirements for sulfur-containing wastewater treatment in offshore oilfields. Furthermore, the skid-mounted structure allows for high-speed transportation, minimizes deck space requirements, and facilitates on-site hoisting. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an embodiment of the skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to this utility model;

[0030] Figure 2 yes Figure 1 A top-view structural diagram;

[0031] Figure 3 yes Figure 1 A structural diagram from another angle;

[0032] Figure 4 yes Figure 1 A schematic diagram of the left-side view structure;

[0033] Figure 5 This is a control principle diagram of a skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields.

[0034] Figure 6This is a schematic diagram of the desulfurization tank in the skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to this utility model;

[0035] Figure 7 yes Figure 6 A schematic diagram of the structure of the influent manifold.

[0036] In the picture: 1. Crowbar;

[0037] 2. Drug mixing unit; 21. Inlet manifold; 210. Bottom manifold at the inlet end; 211. Connector; 212. Butterfly valve; 213. Pressure gauge; 214. Inlet flow meter; 22. Dosing plunger pump; 23. Jet mixer; 241. First pipeline mixer; 242. Second pipeline mixer; 25. Hydrogen sulfide detection probe;

[0038] 3. Buffer unit; 31. Desulfurization tank; 310. Inlet manifold; 3100. Upper manifold before tank inlet; 3101. First manifold; 3102. Second manifold; 311. Low-pressure check valve for inlet gas; 312. Low-pressure check valve for outlet gas; 313. Manual exhaust valve; 314. Safety valve; 32. Flip-plate level gauge;

[0039] 4. External discharge unit; 41. Centrifugal pump; 411. External discharge manifold; 412. Drainage manifold; 42. Discharge flow meter;

[0040] 5. Control unit. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "side", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 this utility model.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Figure 1 This is a structural schematic diagram of this embodiment. Figure 2 yes Figure 1 Top view structural diagram, Figure 3 yes Figure 1 Another structural diagram, such as Figures 1-3 As shown, this embodiment provides a skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields, including a skid 1. A chemical mixing unit 2, a buffer unit 3, an external discharge unit 4, and a control unit 5 are mounted on the skid 1. In this embodiment, the skid has a rectangular structure. The chemical mixing unit 2, buffer unit 3, external discharge unit 4, and control unit 5 are integrated within the rectangular skid. Lifting lugs are welded to the four corners of the frame structure to facilitate hoisting and reduce equipment collisions during hoisting.

[0045] The chemical mixing unit 2 enables the closed-loop mixing of liquid desulfurizing agents. The chemical mixing unit 2 includes an inlet manifold 21, a dosing plunger pump 22, a jet mixer 23, and two pipeline mixers. The dosing plunger pump 22 is connected to the inlet manifold 21, and the outlet end of the dosing plunger pump 22 is connected to the inlet of the jet mixer 23 and the inlet of the two pipeline mixers, respectively, enabling the closed-loop injection of agents into the jet mixer 23 or the pipeline mixers.

[0046] Specifically, in this embodiment, a T-junction is installed at the outlet manifold of the dosing plunger pump 22, connecting the jet mixer 23 and the pipeline mixer respectively, facilitating the adjustment of the desulfurizing agent injection position. Independent manifolds and control valves are installed on the jet mixer 23 and the two pipeline mixers, with the control valves electrically connected to the circuit control box. By adjusting the control valves, the jet mixer 23 and the pipeline mixers can be used in series or individually. Adding the jet mixer 23 at the front end of the pipeline mixer, based on the negative pressure suction principle at the agent mixing inlet of the jet mixer 23, is more conducive to the injection of viscous desulfurizing agent. The two pipeline mixers, each 1m long, solve the problem of excessively long pipeline integration planning and extend the mixing time between the desulfurizing agent and the sulfur-containing production water.

[0047] The buffer unit 3 is used to buffer the production water and prolong the reaction time of the reagents. The buffer unit 3 includes a desulfurization tank 31 and a flap level gauge 32 installed on the desulfurization tank 31.

[0048] Figure 4 yes Figure 1 A schematic diagram of the left-side view structure. Figure 5 This is the control principle diagram of this embodiment, as shown below. Figure 4 and Figure 5 As shown, the inlet manifold 310 of the desulfurization tank 31 is connected to the outlet end of the inlet manifold 21, and the flap level gauge 32 is connected to the control unit 5, so that the liquid level in the desulfurization tank 31 can be monitored in real time during the operation of the equipment.

[0049] The external discharge unit 4 is used for the external discharge of qualified production water. The external discharge unit 4 includes a centrifugal pump 41, an external discharge manifold 411, and a discharge manifold 412. The outlet of the centrifugal pump 41 is respectively equipped with external discharge manifold 411 and discharge manifold 412. When the hydrogen sulfide in the externally discharged production water meets the standards, it is discharged through external discharge manifold 411. When the hydrogen sulfide in the externally discharged production water does not meet the standards, it can be connected to inlet manifold 21 or incoming liquid manifold 310 through discharge manifold 412 to achieve secondary desulfurization of the production water in the desulfurization tank.

[0050] In this embodiment, the centrifugal pump 41 is a variable frequency horizontal centrifugal pump, used for external transmission when the produced water meets the standards or for secondary desulfurization treatment when it does not. The variable frequency motor of the centrifugal pump 41 enables variable frequency regulation of the output produced water volume.

[0051] The control unit 5 includes a circuit control box for controlling the operation of the device. In this embodiment, the circuit control box uses a commercially available "waterproof, fireproof, and explosion-proof" tri-proof electrical control cabinet. Figure 5 As shown, both the dosing plunger pump 22 and the centrifugal pump 41 are electrically connected to the circuit control box, which is powered by the platform distribution cabinet connected by a cable. In this embodiment, the dosing plunger pump 22 is powered by the circuit control box, and the dosing flow rate is 40-100 L / h. Of course, under different usage conditions, the flow rate can be adjusted according to the hydrogen sulfide concentration in the production water on site.

[0052] This skid-mounted sulfur-containing wastewater mixing and desulfurization unit for offshore oilfields utilizes a skid 1, on which are mounted a chemical mixing unit 2, a buffer unit 3, an external discharge unit 4, and a control unit 5. These units respectively achieve closed-loop mixing of liquid desulfurization agents, buffering of production water to extend the reaction time of the agents, external discharge of compliant production water, secondary desulfurization of substandard production water, and circuit control of the unit's operation. Ultimately, it removes hydrogen sulfide from the production water. The overall unit features high integration, excellent desulfurization effect, simple operation, small footprint, convenient installation, and high safety performance. It solves the problem of excessive hydrogen sulfide in the production water of offshore oilfield production platforms, preventing its open use. It is environmentally friendly, producing no pollutants or hazardous chemicals, and meets the requirements for sulfur-containing wastewater treatment in offshore oilfields. Furthermore, its skid-mounted structure allows for high-speed transportation, minimizes deck space requirements, and facilitates on-site hoisting.

[0053] As an optional implementation method, such as Figure 1 As shown, the inlet manifold 21 is provided with a connector 211, a butterfly valve 212, a pressure gauge 213, and an inlet flow meter 214 in sequence along the direction of liquid flow.

[0054] Among them, connector 211 adopts a 2-inch 1502 Union male connector. The inlet of the skid-mounted sulfur-containing wastewater mixing and desulfurization device used in offshore oil fields adopts a 2-inch 1502 Union male connector, which can better match the commonly used manifold connectors and production water flow inlets in offshore oil field operations.

[0055] The butterfly valve 212, pressure gauge 213, and inlet flow meter 214 are all made of 316 stainless steel. The inlet manifold 21 includes a DN50 stainless steel pipe, made of 304 or higher grade stainless steel, preferably 316 stainless steel, which is resistant to hydrogen sulfide corrosion. The butterfly valve 212, pressure gauge 213, and inlet flow meter 214 are all electrically connected to the circuit control box. By sequentially installing the connector 211, butterfly valve 212, pressure gauge 213, and inlet flow meter 214 along the liquid flow direction on the inlet manifold 21, the system can monitor the inlet pressure and flow rate while meeting the requirements for resistance to hydrogen sulfide corrosion.

[0056] As an optional implementation method, Figure 6 This is a schematic diagram of the desulfurization tank in this embodiment. Figure 7 yes Figure 6 A schematic diagram of the structure of the influent manifold is shown below. Figure 6 and Figure 7 As shown, the liquid inlet manifold 310 adopts a "T" shaped structure, including a first manifold 3101 and a second manifold 3102 that is vertically connected to the center of the first manifold 3101 and communicates with the first manifold 3101.

[0057] The second manifold 3102 extends from the outside of the desulfurization tank 31 into the inside of the desulfurization tank 31; the first manifold 3101 is located inside the desulfurization tank 31.

[0058] By setting the liquid manifold 310 to adopt a "T"-shaped structure, the production water in front of the tank can be dispersed and diverted, avoiding the problem of perforation corrosion inside the desulfurization tank 31 caused by the impact of the production water containing hydrogen sulfide on a single point inside the desulfurization tank 31.

[0059] As an optional implementation, a one-inch ball valve is installed on the bottom manifold 210 at the inlet end of the inlet manifold 21 and on the upper manifold 3100 at the front of the tank inlet of the inlet manifold 310. This is used to connect a hose for cleaning the manifold lines of the device.

[0060] As an optional implementation, the external discharge unit 4 also includes an outlet flow meter 42, which is electrically connected to the control unit 5 and is used for flow monitoring when the production water is discharged, so as to facilitate the adjustment of the liquid level in the desulfurization tank.

[0061] Specifically, the external output manifold 411 is connected to the outlet flow meter 42, and the drain manifold 412 is connected to the back end of the inlet flow meter 214. When the hydrogen sulfide in the output production water does not meet the standard, the output can be stopped by the control valve to achieve secondary desulfurization of the production water in the desulfurization tank.

[0062] Both the external pipeline manifold 411 and the drainage manifold 412 are equipped with connectors, which are 2-inch 1502 female-threaded union connectors, to better match the connection of commonly used manifold connectors in offshore oilfield operations. Both the external pipeline manifold 411 and the drainage manifold 412 use DN50 pipes and are equipped with butterfly valves.

[0063] As an optional implementation, the drug mixing unit 2 also includes a hydrogen sulfide detection probe 25, which is located between the jet mixer 23 and the pipeline mixer and is electrically connected to the control unit 5.

[0064] In this embodiment, the hydrogen sulfide detection probe 25 is installed in the lower part of the skid-mounted sulfur-containing wastewater mixing and desulfurization device used in this offshore oilfield. By arranging the hydrogen sulfide detection probe 25 in the densely packed area of ​​the inlet manifold of the chemical mixing unit 2, real-time monitoring of hydrogen sulfide in the vicinity of this area can be achieved. In actual production and use, an alarm device can be installed and connected to the alarm device control unit 5, which will issue an alarm when hydrogen sulfide is detected.

[0065] As an optional implementation method, such as Figure 3 As shown, the desulfurization tank 31 is equipped with a low-pressure check valve 311 for introducing gas, a low-pressure check valve 312 for discharging gas, and / or a manual exhaust valve 313.

[0066] Specifically, a low-pressure check valve 311 for introducing gas, a low-pressure check valve 312 for discharging gas, and / or a manual exhaust valve 313 are installed on the top of the desulfurization tank 31 via a DN25 manifold. The low-pressure check valve 311 is used to introduce air from outside the desulfurization tank 31 into the tank; the low-pressure check valve 312 is used to discharge hydrogen sulfide gas from inside the tank 31. This achieves secondary treatment of introducing air from outside the desulfurization tank 31 and discharging hydrogen sulfide gas from inside the tank 31.

[0067] In some embodiments, a manual exhaust valve 313 may also be provided on the desulfurization tank 31. Specifically, the manual exhaust valve 313 is connected through a DN25 manifold for manually venting air from inside the desulfurization tank 31 to the outside of the desulfurization tank 31.

[0068] In some embodiments, a safety valve 314 may also be provided on the desulfurization tank 31 to ensure safety inside the desulfurization tank 31.

[0069] like Figure 1 As shown, the operation process of the above-mentioned skid-mounted desulfurization unit for sulfur-containing wastewater in offshore oil fields includes a process for achieving desulfurization standards for sulfur-containing production water and a process for when desulfurization of sulfur-containing production water fails to meet standards.

[0070] The process for desulfurizing sulfur-containing production water to meet standards includes at least the following:

[0071] Operation Flow 1: Flow → Connector 211 → Butterfly Valve 212 → Pressure Gauge 213 → Incoming Liquid Flow Meter 214 → Jet Mixer 23 → First Pipe Mixer 241 → Second Pipe Mixer 242 → Desulfurization Tank 31 → Centrifugal Pump 41 → External Transfer Manifold 411 → Mud Tank.

[0072] Operational process 2: Flow → Connector 211 → Butterfly valve 212 → Pressure gauge 213 → Incoming liquid flow meter 214 → Jet mixer 23 → Desulfurization tank 31 → Centrifugal pump 41 → External transmission manifold 411 → Mud tank.

[0073] Operational process 3: Process → Connector 211 → Butterfly Valve 212 → Pressure Gauge 213 → Incoming Liquid Flow Meter 214 → First Pipeline Mixer 241 → Second Pipeline Mixer 242 → Desulfurization Tank 31 → Centrifugal Pump 41 → External Output Manifold 411 → Slurry Tank.

[0074] Taking process flow one as an example, the process for handling sulfur-containing production water that fails to meet desulfurization standards includes:

[0075] The process flow is as follows: Connector 211 → Butterfly Valve 212 → Pressure Gauge 213 → Incoming Liquid Flow Meter 214 → Jet Mixer 23 → First Pipe Mixer 241 → Second Pipe Mixer 242 → Desulfurization Tank 31 → Centrifugal Pump 41 → Drainage Manifold 412 → Jet Mixer 23. After secondary desulfurization via the first pipe mixer 241 → second pipe mixer 242 → desulfurization tank 31, the sulfur-containing production water is tested to ensure it meets the desulfurization standards. If it does, the process continues with the centrifugal pump 41 → external discharge manifold 411 → mud tank.

[0076] When the desulfurization of sulfur-containing production water fails to meet the standards in operation process two and three, the process is the same as that in operation process one above, and will not be repeated here.

[0077] The method of using the above-mentioned skid-mounted desulfurization device for sulfur-containing wastewater in offshore oil fields includes the following steps:

[0078] Step 1: Placement, connection, and debugging of the device:

[0079] After the equipment arrives at the platform, it should be placed reasonably according to the site conditions. The equipment should be placed for easy operation and with an escape route. After obtaining the work permit, the platform electrician will connect the main power supply of the equipment to the platform distribution cabinet, and the equipment operator will conduct a test run to confirm that the motor rotation is correct. If the direction is reversed, the electrician will need to reverse the phase wire.

[0080] Confirm the processing procedure, connect the production manifold to connector 211 of the skid-mounted sulfur-containing wastewater treatment system via a high-pressure hose; the outlet is connected to the high-pressure manifold to the mud tank via the union female thread at the rear end of the influent flow meter 214, and the union is tightened to prevent liquid leakage.

[0081] Connect the reagent tank to the dosing plunger pump 22, and quickly connect the rear end of the low-pressure check valve 312 to the reagent tank pipeline; place the hose at the rear end of the low-pressure check valve 312 to a certain depth in the desulfurization reagent tank to ensure that the hydrogen sulfide contained in the gas discharged from the tank is effectively absorbed.

[0082] After all the equipment's connecting pipelines are tightened and effectively secured, and safety chains and other anti-detachment measures are installed at the joints, the equipment is test-run to confirm that the equipment and instruments are functioning normally.

[0083] Based on the hydrogen sulfide concentration surveyed in the water produced by the platform, the dosage plunger pump 22 is adjusted to regulate the dosage injection quantity.

[0084] Step 2, Use

[0085] After setting up warning and isolation areas in the work area, start the dosing plunger pump 22 to inject a measured amount of desulfurizing agent into the pipeline mixer and manifold in advance. Then close the ball valve between the outlet of the dosing plunger pump 22 and the pipeline mixer, and open the ball valve between the outlet of the dosing plunger pump 22 and the jet mixer 23.

[0086] Method 1 (External Output Testing Compliance): Following the flow path of process one, slowly open the production water supply valve at the platform's flow end. During water supply, start the dosing plunger pump 22. Periodically sample and record the hydrogen sulfide concentration at the front end of the desulfurization tank 31 (initially every 10 minutes, then every 30 minutes after stabilization). If the concentration meets the standard, the fluid volume in the desulfurization tank 31 should be 3 ± 0.5 m³. 3 When the tank is half full, start the variable frequency horizontal centrifugal pump 41 to transport the production water from the mud tank. During this period, adjust the discharge and inlet flow of the variable frequency horizontal centrifugal pump 41 to keep the volume of the desulfurization tank 31 within the range of 3±0.5m3.

[0087] Handling Method 2 (Handling of Excessive Output Testing): According to the procedure Figure 1 Open the equipment valves, and slowly open the production water supply valve at the platform process end. During water supply, start the dosing plunger pump 22. Take samples at the front end of the desulfurization tank 31 and record the hydrogen sulfide concentration regularly (record once every 10 minutes initially, and once every 30 minutes after stabilization). If the concentration does not meet the standard, contact the platform to close the production water supply process valve, close the butterfly valve 212 and the outgoing butterfly valve at the front end of the liquid flow meter 42, open the valve for handling the excessive detection, start the centrifugal pump 41, and simultaneously increase the dosing injection rate of the dosing plunger pump 22. Take samples at the front end of the desulfurization tank 31 and record the hydrogen sulfide concentration regularly until the detection standard is met (record once every 10 minutes during this period). Open the outgoing butterfly valve at the front end of the incoming liquid flow meter 214 and continue the operation according to the treatment method 1.

[0088] Verification experiment:

[0089]

[0090] As shown in the table above, when the hydrogen sulfide volatilization concentration in the incoming production water is less than 2000 ppm, the flow rate of the sulfur-containing production water is 15-25 m³ / h. 3 The treated production water has a hydrogen sulfide content of less than 10 ppm. Field experimental applications show that the chemically-treated desulfurization skid-mounted unit is very effective in treating hydrogen sulfide in production water from offshore platforms and can meet the hydrogen sulfide treatment requirements of process water from offshore oil platforms.

[0091] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields, characterized in that: The system includes a skid, on which a drug mixing unit, a buffer unit, an external delivery and drainage unit, and a control unit are mounted, wherein: The drug mixing unit includes an inlet manifold, a dosing plunger pump, a jet mixer, and two pipeline mixers. The dosing plunger pump is connected to the inlet manifold, and the outlet end of the dosing plunger pump is connected to the inlet of the jet mixer and the inlet of the two pipeline mixers, respectively. The buffer unit includes a desulfurization tank and a flap level gauge installed on the desulfurization tank. The inlet manifold of the desulfurization tank is connected to the outlet end of the inlet manifold, and the flap level gauge is connected to the control unit. The external discharge unit includes a centrifugal pump, and the outlet of the centrifugal pump is respectively provided with an external discharge manifold and a discharge manifold. The external discharge manifold is used for external discharge, and the discharge manifold is connected to the inlet manifold for secondary desulfurization through the desulfurization tank. The control unit includes a circuit control box, and the dosing plunger pump and the centrifugal pump are both electrically connected to the circuit control box.

2. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to claim 1, characterized in that: The inlet manifold is sequentially equipped with a connector, a butterfly valve, a pressure gauge, and an inlet flow meter along the direction of liquid flow. The butterfly valve, the pressure gauge, and the inlet flow meter are all electrically connected to the circuit control box.

3. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to claim 1, characterized in that: The jet mixer and the two pipe mixers are each equipped with independent manifolds and control valves, and the control valves are electrically connected to the circuit control box.

4. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to any one of claims 1-3, characterized in that: The inlet manifold adopts a "T" shaped structure, including a first manifold and a second manifold that is vertically connected to the center of the first manifold and communicates with the first manifold, wherein: The second manifold extends from the outside of the desulfurization tank into the inside of the desulfurization tank; The first manifold is located inside the desulfurization tank.

5. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to claim 4, characterized in that: A one-inch ball valve is installed on the bottom manifold of the liquid inlet manifold and the upper manifold of the liquid inlet manifold of the desulfurization tank, respectively, to connect to the inlet of a one-inch pressure handle quick connector.

6. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to claim 2 or 3, characterized in that: The external discharge unit further includes an outlet flow meter, which is electrically connected to the control unit, wherein: The external delivery manifold is connected to the outlet flow meter, and the drain manifold is connected to the inlet flow meter; Both the external pipeline manifold and the drainage pipeline manifold are equipped with connectors, which are 2-inch 1502 female union connectors.

7. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to any one of claims 1-3, characterized in that: The drug mixing unit also includes a hydrogen sulfide detection probe, which is located between the jet mixer and the pipeline mixer, and is electrically connected to the control unit.

8. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to any one of claims 1-3, characterized in that: The desulfurization tank is equipped with: A low-pressure one-way valve for introducing air from outside the desulfurization tank into the desulfurization tank; A low-pressure check valve for venting hydrogen sulfide gas from the desulfurization tank; And / or, a manual venting valve for venting the desulfurization tank.

9. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to claim 8, characterized in that: The centrifugal pump is a variable frequency horizontal centrifugal pump.

10. The skid-mounted sulfur-containing wastewater mixing and desulfurization device for offshore oil fields according to claim 2, characterized in that: The connector is a 2-inch 1502 male unibody connector.

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