CN205275333U - Oil field extraction water composite treatment system - Google Patents

Abstract

The utility model belongs to the technical field of water treatment, and specifically provides a composite treatment system for oilfield produced water, which includes an oil-water separator, a buffer water tank, an inorganic carbon film processor, a water storage tank, a filter adsorption processor, a backwash pump and Purify the water tank, separate the oil from water and treat it with an inorganic carbon membrane, and then filter and absorb, so that the slick oil and emulsified oil in the product water can be completely removed, the effect of removing dissolved oil in the water is better, and the residual dissolved oil content in the product water is extremely low , The utility model is simple in operation, convenient in maintenance, low in cost, does not need chemical agents such as pH regulators, flocculants and coagulants, has no secondary pollution, and has little environmental pollution.

Description

A composite treatment system for oilfield produced water

technical field

The utility model relates to a treatment system for oilfield produced water, which belongs to the technical field of water treatment.

Background technique

Due to the complex composition of oilfield sewage, which mainly contains oil, suspended solids, rock debris, corrosion products, gas and bacterial microorganisms, etc., the oil content and the form of oil in water are also different. In practical applications, a single water treatment method is usually adopted. Often the effect is not good and there are limitations, so two or more methods need to be used in combination.

The water quality characteristics, production methods, environmental conditions and uses of treated water in oilfields are different, and oilfield sewage treatment processes are quite different, but the main methods are through demulsification and removal of dispersed oil, gravity sedimentation separation, air flotation separation, coarse filtration, Processes such as fine filtration and membrane treatment are long, cumbersome, difficult to control, and the water quality fluctuates greatly. It also needs chemical treatment methods combined with demulsifiers, flocculants, and coagulant aids to make the effluent water quality meet the standard requirements. , which causes secondary pollution of water, and the current traditional treatment process for the removal of dirty oil in water is mainly for slick oil, dispersed oil and emulsified oil, it is difficult to remove the dissolved oil in water, and the oil in produced water Although the content can reach less than 5.0mg/L, it is difficult to meet the requirement of less than 1.0mg/L.

Utility model content

The purpose of this utility model is to provide a complex treatment system for oilfield produced water in view of the technical problems in the existing oilfield produced water treatment process, such as many processing equipment, long and complicated process route, difficult operation and control, and large fluctuation of effluent water quality. .

In order to achieve the above purpose, the technical solution adopted by the utility model is the oilfield produced water composite treatment system, including oil-water separator, buffer water tank, inorganic carbon film processor, water storage tank, filter adsorption processor, backwash pump and purification pitcher;

Wherein the water outlet of the oil-water separator is connected with the water inlet of the buffer water tank through the pipeline, the water outlet of the buffer water tank is connected with the water inlet of the inorganic carbon film processor through the pipeline, and the filter water port of the inorganic carbon film processor is connected with the water storage tank through the pipeline The water inlet is connected, the concentrated water outlet is connected with the water inlet of the oil-water separator through the pipeline, the water outlet of the storage tank is connected with the water inlet of the filter adsorption processor through the pipeline, and the water outlet of the filter adsorption processor is connected with the water inlet of the purified water tank connected, the purified water outlet of the purified water tank is connected with the purified water pipeline, and the backwash water outlet is connected with the backwash water inlet of the inorganic carbon film processor through the backwash pump.

The pore diameter of the inorganic carbon membrane of the above-mentioned inorganic carbon membrane processor is 0.01-0.6 μm, and the transmembrane pressure difference is 0.05-0.5 MPa.

The pressure difference of the filter adsorption processor is 0.02-0.1 MPa, and the filtration rate of the filter adsorption processor is 3-12 m/h.

The filter material of the filter adsorption processor is made by mixing chalk and diatomaceous earth according to the mass ratio of 1:3-1:8, and then roasting at 850-1150° C. for 40-90 minutes.

The oilfield produced water composite treatment system of the utility model mainly uses oil-water separation and inorganic carbon film treatment, and then uses roasted chalk and diatomaceous earth as filter materials to intercept the residual suspended matter in the water and absorb the dissolved oil, so that the effluent meets : Oil content < 1.0mg/L, suspended matter content < 1.0mg/L, particle size median < 1μm standard requirements, the utility model has simple processing route, short processing time, high removal efficiency, and fully utilizes the inorganic carbon film Strong anti-pollution and oil-resistant characteristics, effective interception and filtration of suspended solids, emulsified oil, and slick oil, and easy to wash, no need to stop during use, ensuring continuous operation of the system. The utility model is simple in operation and maintenance. Low cost, stable operation, continuous operation for 17 days after the test, stable oil content, suspended solids and median particle size content in the produced water, and the utility model does not require chemical agents such as pH regulators, flocculants and coagulants, without any difference secondary pollution, less environmental pollution, so that the slick oil and emulsified oil in the produced water can be completely removed. Analysis method"SY/T5329-2012 standard requirements.

Description of drawings

Fig. 1 is a structural block diagram of the composite treatment system for oilfield produced water of the present utility model.

detailed description

The technical solution of the utility model is further described in conjunction with the accompanying drawings and embodiments.

It can be seen from Figure 1 that the oilfield produced water composite treatment system is composed of oil-water separator 1, buffer water tank 2, inorganic carbon film processor 3, water storage tank 4, filter adsorption processor 5, backwash pump 7 and purified water tank 6 Constructed by pipe connections.

Among them: the oil-water separator 1 belongs to the pretreatment unit, which can be a cyclone or an inclined plate degreaser or a three-phase separator, which is a commonly used equipment. The pipeline is connected, and the water outlet of this oil-water separator 1 is communicated with the water inlet of buffer water tank 2 through pipeline, and the water outlet of buffer water tank 2 is communicated with the water inlet of inorganic carbon membrane processor 3 through pipeline, and the filtration of inorganic carbon membrane processor 3 The water outlet is connected to the water inlet of the storage tank 4 through a pipeline, and the concentrated water outlet of the inorganic carbon film processor 3 is connected to the water inlet of the oil-water separator 1 through a pipeline, and the concentrated water part containing suspended solids and slick oil is returned to the oil-water Separator 1 circulation process, the water outlet of storage tank 4 communicates with the water inlet of filter adsorption processor 5 through pipeline, the water outlet of filter adsorption processor 5 communicates with the water inlet of purified water tank 6, the purification of purified water tank 6 The water outlet communicates with the purified water pipeline, and the backwash water outlet communicates with the backwash water inlet of the inorganic carbon film processor 3 through the backwash pump 7 installed on the pipeline.

The above-mentioned inorganic carbon membrane processor 3 adopts a cross-flow method, and its filter material is a multi-channel membrane core made of composite silicon carbide material, and the membrane pore diameter is between 0.01-0.10 μm.

The structure of the above-mentioned filter adsorption processor 5 belongs to the structure of an ordinary filter element filter. The filter element filter material of the present utility model is a mixture of sintered chalk and diatomaceous earth. The substance is adsorbed and filtered, so as to achieve the effect of purification. The mixing mass ratio of the chalk and diatomite of the utility model can be arbitrarily selected between 1:3～1:8. The chalk and diatomite of the utility model are according to After proportional mixing, it needs to be roasted at a temperature of 850-1150°C for 40-90 minutes, and made into a filter element and packed in a filter.

The method for the above-mentioned system to realize the compound treatment of oilfield produced water is composed of the following steps:

(1) Preliminarily separate the oil and water after the oilfield produced water stays in the oil-water separator 1 for a certain period of time, and remove the slick oil and hard suspended matter, so that the oil content in the preliminary separated water is ≤100mg/L, and the suspended matter content is ≤100mg /L;

(2) The deoiled water obtained after preliminary separation is buffered by the buffer water tank 2, and then processed by cross-flow filtration at room temperature in the inorganic carbon film processor 3 to remove floating oil, emulsified oil and residual suspended matter in the water body, so that the oil content in the effluent is ≤5mg/L, suspended solids content≤2mg/L, the effluent of concentrated water containing suspended solids and slick oil is returned to oil-water separator 1 for circulation treatment, and the filtered effluent is transported to storage tank 4 for buffering;

(3) The outlet water buffered by the storage tank 4 enters the filtration and adsorption processor 5, passes through the filter material from top to bottom, and uses the filter material to filter and absorb, filter out trace suspended matter and remove the residual dissolved oil by adsorption , so that the effluent water meets the standard requirements of oilfield reinjection water, the oil content is ≤1mg/L, the suspended solid content is ≤1mg/L, and the median particle size is <1μm. The filtered water is stored in the purified water tank 6, and part of it enters as backwash water In the inorganic carbon film processor 3, backwash is carried out, and the rest enters the water injection system.

Claims (4)

1. an oil field extracted water Combined Processing system, it is characterised in that comprise water-and-oil separator (1), buffer tank (2), inorganic carbon film treater (3), ponding case (4), filtration and adsorption treatment device (5), purification water pot (6) and backwashing pump (7);

Wherein the water outlet of water-and-oil separator (1) is connected by the water-in of pipeline with buffer tank (2), the water outlet of buffer tank (2) is connected by the water-in of pipeline with inorganic carbon film treater (3), the filtered water outlet of inorganic carbon film treater (3) is connected by the water-in of pipeline with ponding case (4), dense water out is connected by the water-in of pipeline with water-and-oil separator (1), the water outlet of ponding case (4) is connected by the water-in of pipeline with filtration and adsorption treatment device (5), the water outlet of filtration and adsorption treatment device (5) is connected with the water-in of purification water pot (6), purify waste water outlet and the pipeline communication of purifying waste water of purification water pot (6), backwash water outlet is connected by the backwash water entrance of backwashing pump (7) with inorganic carbon film treater (3).

2. oil field extracted water Combined Processing system according to claim 1, it is characterised in that the inorganic carbon film membrane pore size of described inorganic carbon film treater (3) is 0.01��0.6 ��m, and transmembrane pressure is 0.05��0.5MPa.

3. oil field extracted water Combined Processing system according to claim 1, it is characterised in that the pressure reduction of described filtration and adsorption treatment device (5) is 0.02��0.1MPa, and the filtering velocity of filtration and adsorption treatment device (5) is 3��12m/h.

4. oil field extracted water Combined Processing system according to claim 1, it is characterised in that the filtering material of described filtration and adsorption treatment device (5) makes at 850��1150 DEG C of roasting 40��90min after mixing according to the ratio that mass ratio is 1:3��1:8 with diatomite by chalk.