CN204918224U - Oil field sewage treatment device - Google Patents

Abstract

The utility model discloses an oil field sewage treatment device, which comprises a filtering device for filtering floating oil in sewage, a separation device for separating solid impurities in sewage, a distillation device for purifying sewage, and a natural gas recovery device for recovering natural gas The filter device includes a filter tank and a sewage inlet pipe and a sewage outlet pipe connected to the filter tank. A scraper mechanism for scraping oil floating in the sewage is fixedly connected to the top of one side of the filter tank. The other side is provided with an oil storage pool for storing floating oil, the separation device includes a centrifugal separator and a residue recovery tank, the distillation device includes a distillation tower, a water inlet pipe and a gas outlet pipe, and the natural gas recovery device includes a natural gas separator and a gas storage tank for storing natural gas; the utility model has the advantages of high sewage treatment efficiency and good sewage treatment effect, and can realize resource recycling and utilization.

Description

An oilfield sewage treatment device

technical field

The utility model belongs to the technical field of sewage treatment equipment, in particular to an oilfield sewage treatment device.

Background technique

An oil field is the sum of oil and gas reservoirs in the same oil and gas production area under the control of a single geological structure (or formation) factor. A field may have one or more reservoirs. In the same area, the oil field is mainly composed of oil reservoirs, and the gas field is mainly composed of gas reservoirs. According to the geological factors controlling the oil and gas production area, the oil and gas fields are divided into three categories: ① Structural oil and gas fields. Refers to the oil and gas production area controlled by a single structural factor, such as folds and faults. ② Stratigraphic oil and gas fields, oil-bearing areas controlled by stratigraphic factors (such as stratum unconformity, pinch-out and lithological changes, etc.) on the regional anticline or monocline structural background. ③ Compound oil and gas fields. The oil and gas fields in the oil and gas production area are not controlled by a single structural or stratigraphic factor, but are controlled by multiple geological factors. Pumping units are common equipment in oilfield exploitation.

The composition of oilfield sewage is relatively complex, the oil content and the form of oil in water are also different, and in most cases it is often mixed with other wastewater, so a single method is often ineffective. At the same time, because various force methods have their limitations, in practical applications, two or three methods are usually used in combination to make the effluent water quality meet the discharge standard. In addition, the production methods, environmental requirements and uses of treated water in each oilfield are different, which makes the oilfield sewage treatment process quite different. In these processes, the common primary treatment includes gravity separation, flotation and centrifugal separation, mainly to remove slick oil and oil-wet solids; the secondary treatment includes filtration, coarse granulation, chemical treatment, etc., mainly to break emulsion and remove Dispersed oil; advanced treatment includes ultrafiltration, activated carbon adsorption, biochemical treatment, etc., mainly to remove dissolved oil. Therefore, the existing oilfield sewage treatment device has a complex structure, high manufacturing cost, and poor treatment effect on sewage, and the treated sewage cannot meet the use standard of domestic water.

Contents of the invention

In view of the above problems, the technical problem to be solved by the utility model is to provide an oilfield sewage treatment device with high sewage treatment efficiency, good sewage treatment effect and the ability to realize resource recycling.

The oilfield sewage treatment device of the utility model comprises a filter device for filtering floating oil in sewage, a separation device for separating solid impurities in sewage, a distillation device for purifying sewage, and a natural gas recovery device for recovering natural gas. The filter device includes a filter tank and a sewage inlet pipe and a sewage outlet pipe connected to the filter tank. The top of one side of the filter tank is fixedly connected with a scraping mechanism for scraping the floating oil in the sewage. The other side of the filter tank is An oil storage tank for storing slick oil is provided, the separation device includes a centrifuge and a residue recovery tank, the sewage outlet pipe is connected to the feed port of the centrifuge, and the centrifuge is provided with a residue outlet, so The residue recovery tank is arranged below the residue outlet. The distillation device includes a distillation tower, a water inlet pipe and an air outlet pipe. One end of the water inlet pipe is connected to the water outlet of the centrifuge, and the other end is connected to the distillation tower. One end of the gas pipe is connected to the distillation tower, and the natural gas recovery device includes a natural gas separator and a gas storage tank for storing natural gas, the natural gas separator is connected to the gas storage tank, and the other end of the gas outlet pipe is connected to the natural gas separator connect.

In the oil field sewage treatment device of the present utility model, a dissolved air pump is arranged on the sewage inlet pipe.

In the oilfield sewage treatment device of the present utility model, the scraping mechanism includes a scraper and a cylinder for pushing the scraper to move left and right, and the cylinder is fixed on the installation platform of the filter tank.

In the oilfield sewage treatment device of the present utility model, an electromagnetic valve is arranged on the water inlet pipe.

In the oilfield sewage treatment device of the present utility model, the centrifugal separator is a horizontal centrifugal separator.

Beneficial effects of the utility model: the utility model has high sewage treatment efficiency, good sewage treatment effect, and can realize resource recovery and utilization of oilfield sewage treatment device. When working, sewage enters the filter tank from the sewage inlet pipe. The inlet pipe is equipped with a dissolved air pump, so the sewage entering the filter tank will have air bubbles, and the slick oil contained in the sewage will float up into the filter tank, and the cylinder will drive the scraper to reciprocate in the horizontal direction to remove the floating oil in the filter tank. The slick oil is scraped into the oil storage tank; through the work of the centrifuge, the sewage with solid impurities in the filter tank is treated. After the centrifuge separates the solid impurities in the sewage, the solid impurities are discharged to the residue recovery In the tank, the sewage after removing solid impurities enters the distillation tower; the distillation tower heats the sewage, and the water-gas mixture in the sewage evaporates and enters the natural gas separator, which separates the natural gas from the water-gas mixture After being stored in the gas storage tank, the water vapor in the water-air mixture is discharged into the atmosphere; the utility model effectively realizes the treatment of oilfield sewage, and has the advantages of high sewage treatment efficiency and good sewage treatment effect. At the same time, the utility model It realizes the recovery of natural gas in the sewage, realizes the recovery of resources, and has the advantages of energy saving and environmental protection.

Description of drawings

For ease of illustration, the utility model is described in detail by the following specific implementation and accompanying drawings.

Fig. 1 is the structural representation of the utility model.

Detailed ways

The oil field sewage treatment device as shown in Figure 1 includes a filter device 1 for filtering floating oil in sewage, a separation device 2 for separating solid impurities in sewage, a distillation device 3 for purifying sewage and a device for recovering natural gas Natural gas recovery device 4, the filter device 1 includes a filter tank 11 and a sewage inlet pipe 12 and a sewage outlet pipe 13 connected to the filter tank 11, and the top of one side of the filter tank 11 is fixedly connected with a device for scraping off oil floating in the sewage Scraping mechanism 14, the other side of described filtering tank 11 is provided with the oil storage tank 15 that is used to store slick oil, and described separating device 2 comprises centrifuge 21 and residue recovery tank 22, and described sewage outlet pipe 13 and centrifuge The feeding port of the separator 21 is connected, the centrifuge 21 is provided with a residue outlet 211, the residue recovery tank 22 is arranged below the residue outlet 211, and the distillation device 3 includes a distillation tower 31, a water inlet pipe 32 and Gas outlet pipe 33, one end of the water inlet pipe 32 is connected to the water outlet of the centrifuge 21, the other end is connected to the distillation tower 31, one end of the gas outlet pipe 33 is connected to the distillation tower 31, and the natural gas recovery device 4 includes natural gas The separator 41 and the gas storage tank 42 for storing natural gas, the natural gas separator 41 is connected on the gas storage tank 42, the other end of the gas outlet pipe 33 is connected with the natural gas separator 41, and the sewage inlet pipe 12 is provided with There is a dissolved air pump 16, the scraping mechanism 14 includes a scraper 141 and a cylinder 142 for pushing the scraper 141 to move left and right, the cylinder 142 is fixed on the installation platform 111 of the filter tank 11, and the water inlet pipe 32 is set Electromagnetic valve 5 is arranged, and described centrifuge 21 is a horizontal centrifuge. During work, sewage enters the filter tank from the sewage inlet pipe. Since the sewage inlet pipe is provided with a dissolved air pump, the sewage entering the filter tank will bring If there are air bubbles, the slick oil contained in the sewage will float up into the filter tank, and the cylinder will drive the scraper to reciprocate in the horizontal direction to scrape off the slick oil floating in the filter tank into the oil storage tank; through the work of the centrifuge, The sewage with solid impurities in the filter tank is treated. After the centrifuge separates the solid impurities in the sewage, the solid impurities are discharged into the residue recovery tank, and the sewage after the solid impurities are removed enters the distillation tower; distillation The tower realizes the heating of sewage. The water-gas mixture in the sewage evaporates and enters the natural gas separator. The natural gas separator separates out the natural gas in the water-gas mixture and stores it in the gas storage tank. The water vapor in the water-gas mixture is discharged. into the atmosphere; the utility model effectively realizes the treatment of oilfield sewage, and has the advantages of high sewage treatment efficiency and good sewage treatment effect. The advantages of energy saving and environmental protection.

The above-mentioned embodiments are only descriptions of preferred implementations of the present utility model, and are not intended to limit the concept and scope of the present utility model. Under the premise of not departing from the design concept of the present utility model, various modifications and improvements made by ordinary persons in the art to the technical solution of the present utility model should fall into the protection scope of the present utility model, and the technology claimed by the utility model The contents are all described in the claims.

Claims (5)

1. a kind of oil field sewage treatment device, it is characterized in that: comprise the filtering device (1) that is used to filter floating oil in the sewage, the separation device (2) that is used to separate solid impurity in the sewage, the distilling device (for purifying sewage) 3) and a natural gas recovery device (4) for recovering natural gas, the filter device (1) includes a filter tank (11) and a sewage inlet pipe (12) and a sewage outlet pipe (13) connected to the filter tank (11) , the top of one side of the filter tank (11) is fixedly connected with a scraper mechanism (14) for scraping the oil slick in the sewage, and the other side of the filter tank (11) is provided with an oil storage tank for storing the slick oil (15), the separation device (2) includes a centrifuge (21) and a residue recovery tank (22), the sewage outlet pipe (13) is connected to the feed port of the centrifuge (21), and the centrifuge The separator (21) is provided with a residue outlet (211), the residue recovery tank (22) is arranged below the residue outlet (211), and the distillation device (3) includes a distillation tower (31), a water inlet pipe (32 ) and outlet pipe (33), one end of the water inlet pipe (32) is connected with the water outlet of the centrifuge (21), and the other end is connected with the distillation tower (31), and one end of the outlet pipe (33) is connected with the distillation The towers (31) are connected, and the natural gas recovery device (4) includes a natural gas separator (41) and a gas storage tank (42) for storing natural gas, and the natural gas separator (41) is connected to the gas storage tank (42) The other end of the gas outlet pipe (33) is connected to the natural gas separator (41). 2. The oilfield sewage treatment device according to claim 1, characterized in that: the sewage inlet pipe (12) is provided with a dissolved air pump (16). 3. The oilfield sewage treatment device according to claim 1, characterized in that: the scraping mechanism (14) comprises a scraper (141) and a cylinder (142) for pushing the scraper (141) to move left and right, the The cylinder (142) is fixed on the installation platform (111) of the filter tank (11). 4. The oilfield sewage treatment device according to claim 1, characterized in that: the water inlet pipe (32) is provided with a solenoid valve (5). 5. The oilfield sewage treatment device according to claim 1, characterized in that: the centrifugal separator (21) is a horizontal centrifugal separator.