CN111252943A - Sulfur removal skid-mounted device and method in high-sulfur-content oil field sewage combined station - Google Patents

Sulfur removal skid-mounted device and method in high-sulfur-content oil field sewage combined station Download PDF

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CN111252943A
CN111252943A CN202010113162.1A CN202010113162A CN111252943A CN 111252943 A CN111252943 A CN 111252943A CN 202010113162 A CN202010113162 A CN 202010113162A CN 111252943 A CN111252943 A CN 111252943A
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sewage
sulfur
tank body
sulfur removal
oil field
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尹志福
刘凌
刘明霞
畅庚榕
谢燕翔
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Xian Unversity of Arts and Science
Xian University
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Xian Unversity of Arts and Science
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/101—Sulfur compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a sulphur removal skid-mounted device and a sulphur removal skid-mounted method in a high-sulphur hydrogen-sulphide oil field sewage combined station, which comprises a sulphur removal tank body, wherein one path of the sulphur removal tank body is sequentially communicated with a valve, a solid-liquid separator and a feed pump to a sewage treatment system through a sewage discharge pipeline, and the top of the sulphur removal tank body is respectively provided with a pressure gauge and an H pump2S, a gas detector and an exhaust port, wherein the exhaust port is communicated with an emptying pipe; still be equipped with pH sensor, temperature sensor and level sensor on the sulphur removal jar body, be equipped with the solid-state sulphur removal module that is used for sewage treatment in the sulphur removal jar body, the sewage water inlet department of sulphur removal jar body is located to solid-state sulphur removal module layer. The invention can not only effectively slow down the sewage of the high-sulfur-content oil field from the pipelines and the tanks in the stationThe corrosion of the body and other metal facilities can also effectively improve the standard treatment difficulty of sewage and protect the ecological environment and personal safety.

Description

Sulfur removal skid-mounted device and method in high-sulfur-content oil field sewage combined station
Technical Field
The invention relates to the field of anticorrosion technology and environmental protection in oilfield development, in particular to a skid-mounted device and a skid-mounted method for removing sulfur in a combined station by serious corrosion of metal pipelines, tank bodies and facilities of an oilfield in high-sulfur hydrogen sulfide sewage.
Background
During the development of oil fields containing sulfur, especially high-content hydrogen sulfide, H is dissolved in the formation water (hereinafter referred to as oil field sewage) produced by oil wells2S aggressive gas, or H may be generated due to a long-term growth of sulfate-reducing bacteria (SRB) in the pipeline2S gas is dissolved in the oil field sewage. After the oil field sewage enters the combined station, H is dissolved in metal pipelines and tank bodies in the station2S sulfur-containing sewage or sewage tank with large temperature and pressure change, such as the sewage in oil field from pressure pipeline to normal pressure environment, resulting in H escaping2The S gas causes severe electrochemical corrosion, stress corrosion cracking and hydrogen induced cracking, can obviously reduce the service life of the pipeline or equipment, and simultaneously, the H gas causes the H gas2S has unpleasant smell and high toxicity, and can cause environmental pollution and even threaten the personal safety of personnel in the station and people around the station.
At present, the sulfur removal method in the oil field hydrogen sulfide-containing sewage at home and abroad mainly comprises two main types of physical chemical sulfur removal methods and biochemical sulfur removal methods. For example, the sulfur removal method by physical gas stripping is to utilize H2S has low solubility in sewage, and adopts fuel gas, air and the like to reduce H2S partial pressure of gas phase, such that H2S and separation, but the method has large investment on equipment and high cost; the chemical oxidation method (air oxidation, chemical oxidation and photocatalytic oxidation) is to oxidize sulfide into elemental sulfur for removal, but has high cost, large energy consumption and easy secondary pollution; the chemical deposition method is to utilize metal ions and S in sewage2-、HS-、H2S and the like form a separation method of sediment, but the addition of a sediment medicament has large dosage and contains a large amount of water and sludge, and is easy to cause secondary pollution; the biochemical treatment is often combined with other sulfur removal methods for use, the selection of strains is key, the oxidation effect is fast, the energy consumption is low, the investment is high, and special requirements are made on equipment materials.
In order to economically and effectively remove the high-hydrogen-sulfide oil field sewage in the combined station, a chemical oxidation and chemical deposition combined desulphurization process related to a liquid desulphurization agent and a solid desulphurization agent is designed, and considering that the oil field sewage output is unstable, corrosion resistance and sewage standard treatment are considered, and a skid-mounted desulphurization device which is simple and convenient to mount and easy to detach is adopted at an inner inlet of the combined station.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a sulfur removal skid-mounted device and a sulfur removal skid-mounted method for high-sulfur-content oil field sewage at an inlet of a united station, which can effectively slow down the corrosion of the sulfur-containing sewage on oil field ground pipelines, tank bodies and other metal facilities, can also effectively improve the standard treatment difficulty of the sewage, and protect the ecological environment and the personal safety.
The invention is realized by the following technical scheme.
The utility model provides a sulphur removal skid-mounted device in high sulphur hydrogen sulfide oil field sewage combined station, including the sulphur removal jar body, the sulphur removal jar body is all the way through sewage discharge pipeline intercommunication valve, solid-liquid separator and feed pump to sewage treatment system in proper order, is equipped with second pressure gauge, H respectively at sulphur removal jar body top2The gas detector and the exhaust port are communicated with an emptying pipe, and a flowmeter is arranged on the emptying pipe; still be equipped with pH sensor, temperature sensor and level sensor on the sulphur removal jar body, be equipped with the solid-state sulphur removal module that is used for sewage treatment in the sulphur removal jar body, the sewage water inlet department of sulphur removal jar body is located to solid-state sulphur removal module layer.
With respect to the above technical solutions, the present invention has a further preferable solution:
in the device, the sewage pipeline adopts a L245NS sulfur-resistant steel grade ground metal pipeline.
In the device, the thermometer is H-resistant2S/CO2Corroded contact thermocouple digital display thermometer. .
In the device, the pressure gauge adopts a diaphragm pressure gauge.
In the device, the flow meter is a liquid double-rotor flow meter.
In the device, the tubular mixer is a vertical tube for mixing and reacting bactericide C12 alkyl biquaternary ammonium salt, pH regulator NaOH and liquid desulfurizing agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine which are added from a medicine adding port.
In the device, the desulphurizing tank body is made of A3 steel, and the inner wall of the desulphurizing tank body is subjected to sand blasting treatment and then is sprayed with anti-corrosion glass flake coating with a thermal expansion coefficient similar to that of the metal material of the tank body.
Correspondingly, the invention provides a sulphur removal skid-mounted method in a high-sulphur-content oil field sewage combined station, which comprises the following steps:
1) conveying the oilfield sewage to a sewage inlet through a sewage pipeline, and carrying out mixing reaction on bactericide C12 alkyl biquaternary ammonium salt, pH regulator NaOH and liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine which are added through a medicine adding port in a tubular mixer;
2) monitoring the temperature and pressure of the oilfield wastewater in the wastewater pipeline through a first pressure gauge and a thermometer; controlling the sewage flow through an adjusting valve according to the mixing time of the tubular mixer and the capacity of the sulfur-containing sewage treatment tank body;
3) testing the pH value of the oil field sulfur-containing sewage by using an online pH meter in front of a chemical adding port, and adjusting the pH value of the sewage to be within the range of 7.8-8.0 by adding a pH regulator into a chemical adding module, wherein the value can be reflected by a pH sensor arranged on a sulfur removal tank body;
4) the oil field sewage flows through a solid sulfur removal module in the sulfur removal tank body and fully contacts and reacts with the solid sulfur removal agent iron oxide on the upper supporting frame, and the liquid H with the liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine not fully removed2S is used for removing sulfur, and H newly escaped from the sulfur removal tank body2S gas is discharged through an exhaust port;
5) and (4) discharging the sewage subjected to solid-state desulfurization from the desulfurization tank body, allowing the sewage to flow through a solid-liquid separator for solid-liquid separation, and conveying the sewage to an oilfield sewage treatment system by using a feed pump.
In the method, in the step 2), the temperature of the oilfield sewage is 20-70 ℃, and the pressure is 1-10 Mpa; the time for mixing the medicament is 2-3 min, and the sewage flow is less than10m3/h。
The invention adopts the technical scheme that the technical effects are as follows:
through this sulphur removal sled dress process units in high sulphur hydrogen sulfide oil field sewage combination station, can realize that the sulphur sewage after oil recovery produces liquid and oil water separation is carrying the sulphur material and the hydrogen sulfide gas body of dissolved in getting into the combination station entrance and basically handling the sewage completely to effectively slow down the corruption of sulphur sewage to the in-station pipeline, jar body and other metal facilities, effectively improve the sewage treatment degree of difficulty of reinjecting after reaching standard, also can reduce the back injection water injection well after the sewage treatment and to the tubular column degree of corrosion, reduce environmental pollution simultaneously, reduce the potential safety hazard. Therefore, the invention has obvious economic benefit and social benefit and stronger oil field applicability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
In the figure: 1-sewer line, 2-first pressure gauge, 3-thermometer, 4-stop valve, 5-regulating valve, 6-flowmeter, 7-pipeline online pH meter, 8-dosing port, 9-lift pump, 10-tubular mixer, 11-sewage inlet, 12-desulfurizing tank, 13-second pressure gauge, 14-exhaust port, 15-H2The system comprises an S gas detector, a 16-pressure reducing valve, a 17-pH sensor, a 18-temperature sensor, a 19-liquid level sensor, a 20-solid sulfur removal module, a 21-sewage discharge port, a 22-solid-liquid separator and a 23-liquid feeding pump.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
As shown in figure 1, the sulphur removal skid-mounted device in the high-sulphur hydrogen sulfide oil field sewage combined station comprises a sulphur removal tank body 12, a sewage pipeline 1, an exhaust pipeline and a sewage discharge pipeline. Wherein, one way of the sulfur removal tank body 12 is communicated with the sewage pipeline 1The sewage treatment system comprises station sewage, a sewage pipeline 1 is sequentially provided with a first pressure gauge 2, a thermometer 3, a stop valve 4, a regulating valve 5, a flowmeter 6, a pipeline type online pH meter 7, a dosing port 8, a lifting pump 9, a tubular mixer 10 and a sewage inlet 11, a sulfur removal tank body 12 is sequentially communicated with a valve, a solid-liquid separator 22 and a liquid feeding pump 23 to a sewage treatment system through a sewage discharge pipeline, the top of the sulfur removal tank body 12 is respectively provided with a second pressure gauge 13, a H pressure gauge and a water feeding pump 23, and the top of the sulfur removal tank body2S, a gas detector 15 and an exhaust port 14, wherein the exhaust port 14 is communicated with an emptying pipe, and a flowmeter 6 is arranged on the emptying pipe; a pH sensor 17, a temperature sensor 18 and a liquid level sensor 19 are also arranged on the sulfur removal tank body 12, a solid sulfur removal module 20 for sewage treatment is arranged in the sulfur removal tank body 12, and the solid sulfur removal module 20 is arranged at the sewage inlet 11 of the sulfur removal tank body 12 in a layered manner.
The sewage pipeline is used for connecting the tubular mixer, the sulfur removal tank, the solid-liquid separator and the sewage treatment system at a sewage inlet of the oil field united station. Wherein, the pipeline adopts a L245NS sulfur-resistant steel grade ground metal pipeline.
Wherein the thermometer is H-resistant2S/CO2A corrosion contact digital thermocouple thermometer is used to measure the temperature of the sewage flowing through the pipeline. The pressure gauge adopts a diaphragm pressure gauge which is suitable for a strong-corrosion high-temperature liquid medium environment with solid suspended matters and is used for measuring the pressure of sewage flowing through the pipeline. The flowmeter is a corrosion-resistant liquid dual-rotor flowmeter used for accurately measuring the sewage flow flowing through a pipeline. The pipeline type online pH meter is designed before a medicine adding port in a pipeline flow, and aims to test the pH value of sewage so as to determine the dosage of a pH regulator in a medicine adding module and meet the optimal pH value of the sewage desulfurization environment. The stop valve and the regulating valve are respectively used for blocking sewage flow and regulating the sewage flow.
The pump body is used for lifting sewage to the tubular mixer and the desulphurization tank or used as a liquid feeding device for conveying the sewage to the sewage treatment system, the lifting pump adopts a sewage spiral centrifugal pump with good anti-blocking performance, and the liquid feeding pump adopts a diaphragm pump capable of well realizing the regulation and control of certain parameters of the technological process, such as flow and liquid level.
Wherein the tube mixer isAnd (3) fully mixing and reacting the oilfield sewage with the bactericide, the pH regulator and the liquid desulfurizing agent which are added into the chemical injection module by the chemical injection module. The bactericide is selected mainly against iron bacteria, saprophytic bacteria and sulfate reducing bacteria, especially sulfate reducing bacteria can generate new H in closed anoxic environment2S, selecting a C12 alkyl biquaternary ammonium salt bactericide with a good effect; the pH regulator is used for regulating the pH value of the sewage to be 7.8-8.0, and usually NaOH is adopted for regulating to form a weakly alkaline sewage environment; the liquid desulfurizing agent is prepared through first eliminating H from sulfur-containing sewage2S、HS-、S2-The sulfur-containing substances in the same form are primarily removed, and a 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine liquid sulfur remover with excellent sulfur removal effect in a weak alkali environment is adopted.
The desulfurizing tank body is made of A3 steel, and the inner wall of the desulfurizing tank body is sprayed with corrosion-resistant glass flake coating with thermal expansion coefficient similar to that of the metal material of the tank body after sand blasting treatment. Wherein, the sewage water inlet is provided with an electromagnetic valve which is a switch valve for leading the sewage to enter the desulphurization tank together with the mixer, and the electromagnetic force is generated by an electromagnetic coil, and the sewage water inlet is made of corrosion-resistant 316L stainless steel. The second pressure gauge is a pressure gauge for testing gas in the tank, and a floating ball type pressure gauge capable of continuously and stably outputting pressure signals with high reliability is adopted. The gas vent realizes that the pressure of the tank body is too high and is released to a certain pressure range, and a stop valve and a pressure reducing valve are arranged on the gas vent pipeline. H2The S gas detector is used for detecting the gaseous H existing in the tank body in real time2S concentration to ensure H discharge from the exhaust port2The S gas does not exceed the standard. The pH sensor is used for continuously monitoring the pH value of the sewage in the desulphurization tank and has a sealing function with an automatic temperature compensation function. The temperature sensor is a thermocouple type temperature sensor which continuously monitors the temperature of the sewage in the desulphurization tank and is made of 316L stainless steel. The liquid level sensor is a static pressure type liquid level sensor which converts static pressure into an electric signal and outputs the electric signal in a current mode by using a measurement principle of the static pressure of liquid and an advanced isolation type diffused silicon sensitive sensor. The solid-state sulfur removal module is characterized in that iron oxide serving as a solid-state sulfur removal agent is loaded on a support frame at the upper part of a sulfur removal tank, and liquid H is not removed from the sewage subjected to sulfur removal by the liquid-state sulfur removal agent2S molecule or inH escaping from the environment in the sulfur tank2S gas is fully contacted and reacted with ferric oxide to achieve the aim of removing sulfur.
Wherein, the sewage discharge port discharges the sewage of the sulfur removal tank from the tank body to flow to the solid-liquid separator. The solid-liquid separator adopts a centrifugal solid-liquid separator, solid-liquid separation is carried out on the sewage containing certain solid substances such as iron sulfide after the sulfur removal treatment in the sulfur removal tank, and the separated sewage is conveyed to an oil field sewage treatment system by a stop valve and an adjusting valve by a liquid feeding pump.
The solid-state sulfur removal module mainly comprises oil removal, sedimentation, filtration and purification processes of a sewage treatment station in the combined station, chemical adding treatment in the link and the like.
The bactericide filling, the pH regulator filling and the liquid sulfur removing agent filling are added into the medicament filling of the medicament filling port 8 before tubular mixing.
The implementation process comprises the following steps:
opening a stop valve 4 on a sulfur-resistant steel-grade sewage pipeline 1 for conveying oil field sewage to an inlet of a combined station, and continuously and stably monitoring the temperature and the pressure of the sewage in the pipeline respectively by a diaphragm type first pressure gauge 2 and a contact type thermocouple digital display thermometer 3; according to the design requirement of the mixing time of the agent by the tubular mixer 10 and the treatment capacity of the sulfur-containing sewage by the sulfur removal tank, the flow of the sewage is controlled by the adjusting valve 5, and the sewage can be accurately measured by the corrosion-resistant liquid dual-rotor flowmeter 6; a pipeline type online pH meter 7 is arranged in front of a dosing port 8 to test the pH value of the sewage, so that the dosage of a pH regulator added into a medicament adding module is estimated to adjust the pH value of the sulfur-containing sewage treatment to reach the optimal range of 7.8-8, and the optimal pH value of the sewage desulfurization environment is met.
And then, in the agent filling module, firstly filling a bactericide by using a dosing pry to effectively kill bacteria such as sulfate reducing bacteria, then filling a pH regulator to regulate the optimal sewage weak alkaline environment of liquid desulfurization of the sewage, namely the pH value range of 7.8-8.0, and finally filling the liquid desulfurization agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine to remove the most part of sulfur-containing substances.
Then, the lift pump 9 is started to lift the sewage to the tubular mixer 10, then the power is supplied, the electromagnetic valve of the sewage inlet 11 is opened under the action of the electromagnetic coil, and the sewage enters the desulphurization tank 12.
Then, the sewage flows through the solid-state desulphurization module 20 arranged in the desulphurization tank body 12 and fully contacts and reacts with the solid-state desulphurization agent ferric oxide on the upper supporting frame, so that the liquid-state desulphurization agent in the previous process can not fully remove the liquid-state H2S molecules or H newly escaped from the environment in the sulfur removal tank2And (4) S gas.
The air pressure and H in the upper space of the sulfur removal tank 122The S content was measured by a second pressure gauge 13 and H, respectively2 S gas detector 15 for continuous monitoring, when the upper gas pressure in the desulfurizing tank reaches a certain set value and H2When the S content is lower than a certain value, the stop valve and the reducing valve 16 are opened, and the waste is discharged out through the exhaust port 14.
Then, the sewage after solid-state desulfurization falls into the lower part of the desulfurization tank 12, the pH value of the sewage in the desulfurization tank 12 is continuously monitored by using a pH sensor 17 having an automatic temperature compensation function, the temperature of the sewage in the desulfurization tank is continuously monitored by using a thermocouple type temperature sensor 18, and the liquid level in the desulfurization tank 12 is monitored by using a static pressure type liquid level sensor 19.
When the liquid level reaches a certain set value, the stop valve of the sewage discharge port 21 is opened, and the sewage is discharged from the tank body and flows to the centrifugal solid-liquid separator 22.
Then, the solid-liquid separator 22 performs solid-liquid separation on the sewage containing a certain amount of solid matter such as iron sulfide after the sulfur removal treatment in the tank body, and the separated sewage is transported to an oilfield sewage treatment system by a feed pump 23 through a stop valve and an adjusting valve.
And finally, the sewage treatment module in the combined station realizes sewage purification and standard discharge to meet the requirements of ecological environment through oil removal, sedimentation, filtration, purification processes, medicine adding treatment in links and the like, or injects back to supplement formation energy to improve the recovery ratio by water flooding.
The effect of the process according to the invention is further illustrated by the following specific examples.
In one embodiment, a sulfur removal skid device for sulfur-containing sewage is installed at an inlet of a certain oil field united station,wherein the incoming water property is as follows: degree of mineralization of about 3200mg/L, Ca2+And Mg2+The concentrations were about 430mg/L and 128mg/L, respectively, SO4 2-And HCO3 -The concentration was about 670mg/L and 960mg/L, respectively, Cl-The concentration was about 1540mg/L, S2-The concentration was about 210mg/L and the pH was about 7.3.
Conveying the oilfield sewage to a sewage inlet through a sewage pipeline, controlling the dosage of each medicament according to the concentrations of 15mg/L, 15mg/L and 120mg/L respectively by adding a sulfate reducing bacteria bactericide C12 alkyl biquaternary ammonium salt, a pH regulator NaOH and a liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine through a medicament adding port, and carrying out mixing reaction in a tubular mixer; monitoring the temperature of the oil field sewage in the sewage pipeline to be 28 ℃ and the pressure to be 1.8Mpa by a first pressure gauge and a thermometer; the time for mixing the medicament by designing the tubular mixer is controlled to be about 3min, and the flow of the sewage is controlled to be about 8m according to the capability of the sulfur-containing sewage treatment tank body to treat the sulfur-containing sewage3H; in the embodiment, the pH value of a pH sensor on the sulfur removal tank body is controlled to be 8.0, and the dosage of NaOH used as a pH regulator is controlled to be 0.27g/h in a medicament filling module; the oil field sewage flows through the solid sulfur removal module and fully contacts and reacts with the solid sulfur removal agent ferric oxide, and the liquid H which is not fully removed by the liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine2S is desulfurized and newly escaped H2S gas is discharged through an exhaust port; the sewage after solid-state desulphurization is detected by S2-The concentration is reduced from 410mg/L to nearly 6mg/L, then the sulfur removal tank body is discharged, flows through a solid-liquid separator for solid-liquid separation, and the feed liquid pump is conveyed to an oil field sewage treatment system.
The above embodiments show that the method can realize that the sulfur-containing sewage obtained after oil-water separation of the oil production liquid is conveyed to an entrance of the united station to basically and completely treat the sulfur-containing substances and the escaped hydrogen sulfide gas in the sewage, thereby effectively slowing down the corrosion of the sulfur-containing sewage to pipelines, tanks and other metal facilities in the station, and playing an important role in the basic research of the evaluation of the corrosion degree of the tubular column by the reinjection water injection well for the subsequent treatment of the oil field sewage.
The invention designs the sulphur removal skid-mounted device at the entrance of the combined stationFirstly, the sulfur-containing sewage is subjected to desulphurization treatment, a process method combining a liquid desulfurizing agent and solid desulphurization is fully applied, the sulfur content is greatly reduced, the technical difficulty of the subsequent sewage treatment process is reduced, and the whole sewage treatment cost can be saved by more than 15 percent. Simultaneously, the method is also helpful to basically prevent the high-sulfur sewage H from appearing in the non-closed system link of the subsequent sewage treatment system2The escaping S pollutes the environment and even causes human body injury.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims (9)

1. The utility model provides a sulphur removal skid-mounted device in high sulphur hydrogen sulfide oil field sewage combination station, its characterized in that, including sulphur removal jar body (12), sulphur removal jar body (12) are all the way through sewage discharge pipeline intercommunication valve, solid-liquid separator (22) and feed pump (23) to sewage treatment system in proper order, are equipped with second pressure gauge (13), H respectively at sulphur removal jar body (12) top2S, a gas detector (15) and an exhaust port (14), wherein the exhaust port (14) is communicated with a vent pipe, and a flowmeter (6) is arranged on the vent pipe; a pH sensor (17), a temperature sensor (18) and a liquid level sensor (19) are also arranged on the sulfur removal tank body (12), a solid sulfur removal module (20) for sewage treatment is arranged in the sulfur removal tank body (12), and the solid sulfur removal module (20) is arranged at the sewage inlet (11) of the sulfur removal tank body (12).
2. The integrated station sulfur removal skid-mounted device for high-sulfur hydrogen sulfide oilfield sewage according to claim 1, wherein the sewage pipeline is a ground metal pipeline of L245NS sulfur-resistant steel grade.
3. The integrated station sulfur removal skid-mounted device for high-sulfur hydrogen sulfide oilfield sewage as claimed in claim 1, wherein the thermometer is H-resistant2S/CO2Corroded contact thermoelectric even numberAnd a thermometer is displayed.
4. The desulfurization skid-mounted device in the high-sulfur-content oilfield sewage combination station according to claim 1, wherein the pressure gauge is a diaphragm pressure gauge.
5. The integrated station desulfurization skid-mounted device for the high-sulfur hydrogen sulfide oilfield sewage according to claim 1, wherein the flowmeter is a liquid dual-rotor flowmeter.
6. The sulfur removal skid-mounted device in the high-sulfur hydrogen sulfide oil field sewage combined station as claimed in claim 1, wherein the tubular mixer is a vertical tube for mixing and reacting bactericide C12 alkyl biquaternary ammonium salt, pH regulator NaOH and liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine which are added from a feeding port.
7. The integrated station desulfurization skid-mounted device for the high-sulfur-content hydrogen sulfide oilfield sewage according to claim 1, wherein the desulfurization tank body is made of A3 steel, and the inner wall of the desulfurization tank body is subjected to sand blasting treatment and then is coated with anti-corrosion glass flake coating with a thermal expansion coefficient similar to that of the metal material of the tank body.
8. The desulfurization skid-mounted method in the high-sulfur-content oil field sewage combined station of the device of claims 1-7 is characterized by comprising the following steps:
1) conveying oilfield sewage to a sewage inlet (11) through a sewage pipeline (1), and carrying out mixing reaction on bactericide C12 alkyl biquaternary ammonium salt, pH regulator NaOH and liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine which are added through a medicine adding port (8) in a tubular mixer (10);
2) monitoring the temperature and the pressure of the oil field sewage in the sewage pipeline (1) through a first pressure gauge (2) and a thermometer (3), and controlling the sewage flow through a regulating valve (5) according to the mixing time of the chemicals in a tubular mixer (10) and the designed value of the sulfur-containing sewage treatment capacity of a sulfur removal tank body (12);
3) the pH value of the oil field sulfur-containing sewage is tested by an online pH meter (7) in front of a dosing port (8), and meanwhile, the pH value of the sewage is adjusted to be within the range of 7.8-8.0 by adding a pH regulator into a medicament injection module, and the value can be reflected by a pH sensor (17) arranged on a sulfur removal tank body (12);
4) the oil field sewage flows through a solid sulfur removal module (20) in a sulfur removal tank body (12) and fully contacts and reacts with a solid sulfur removal agent ferric oxide on an upper supporting frame, and the liquid H of the liquid sulfur removal agent 1,3, 5-tri- (2-hydroxyethyl) -hexahydro-s-triazine which is not fully removed2S carries out sulfur removal, and H newly escapes from the sulfur removal tank body (12)2S gas is discharged out through an exhaust port (14);
5) the sewage after solid-state desulfurization is discharged from the desulfurization tank body (12) and flows through a solid-liquid separator (22) for solid-liquid separation, and then a feed pump (23) is conveyed to an oil field sewage treatment system.
9. The desulfurization skid-mounted method for the high-sulfur hydrogen sulfide oil field sewage combined station according to claim 8, wherein in the step 2), the temperature of the oil field sewage is 20-70 ℃, and the pressure is 1-10 MPa; the time for mixing the medicament is 2-3 min, and the sewage flow is less than 10m3/h。
CN202010113162.1A 2020-02-24 2020-02-24 Sulfur removal skid-mounted device and method in high-sulfur-content oil field sewage combined station Pending CN111252943A (en)

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CN115594236A (en) * 2021-07-07 2023-01-13 中国石油化工股份有限公司（Cn） Automatic sulfur removal device and method for sulfur-containing gas field sewage

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