A multi-microporous high-precision filter device for treating oilfield oily sewage

Abstract

The application relates to a multi-micropore high-precision filtering device for treating oilfield oily sewage, which relates to an oilfield oily sewage treatment device, wherein water inlet pipes and water outlet pipes are arranged on upper and lower heads of a tank body respectively, a high-strength supporting hole plate is fixed at the lower part of the tank body, a large-flux sand-blocking sieve plate is fixed on the high-strength supporting hole plate, and a multi-micropore ceramic filter material layer is laid on the large-flux sand-blocking sieve plate; a resistance cloth preventing water distributor is arranged in the upper head, one end of the water outlet pipe penetrates through the bottom of the tank body, is arranged below the high-strength supporting hole plate, and a plurality of water distribution branch pipes are uniformly arranged on the outer wall of the high-strength supporting hole plate; a plurality of through holes I are arranged on the water distribution branch pipes; and a multi-layer high-frequency gas rubbing and washing device is arranged in the multi-micropore ceramic filter material layer. The device can improve the capacity of containing impurities, reduce the head of the backwashing pump, improve the filtering precision, reduce the daily operation and maintenance cost, can effectively make all the filter materials in the whole filter bed be completely cleaned without dead angle, and can effectively avoid the phenomenon of backwashing material running and pressure holding.

Description

TECHNICAL FIELD

[0001] The present application relates to oilfield oily sewage treatment process, especially to a kind of for treating oilfield oily sewage multi-pore high-precision filter device. BACKGROUND

[0002] With oilfield gradually beginning three-component composite oil displacement, produced liquid water quality has been completely different from water drive produced liquid water quality, it begins to gradually present water composition complex, extremely stable, difficult to demulsification, surface tension reduction, oil bead coalescence ability decline, raw water viscosity, oil bead floating ability decline, oil removal difficulty, suspended solids settlement difficulty, suspended matter removal difficulty and so on.Characteristics.After produced liquid is treated by traditional process, it is difficult to achieve ideal water quality requirement, which puts forward higher requirement to existing oily sewage treatment process, but current general process does not have any targeted design for three-component produced liquid, so more suitable advanced treatment device needs to be designed according to the water quality characteristics of three-component produced liquid.

[0003] Oilfield existing oily sewage treatment process is widely used in oilfield oily sewage treatment, but in actual production operation process, there are often a series of problems such as filter material hardening, backwashing pressure, backwashing material running, filter material cleaning not thorough, treated water difficult to achieve ideal water quality requirement, etc., at the same time, there are also water, electricity, large land occupation and other shortcomings, which leads to production efficiency reduction and increases production cost. SUMMARY

[0004] The present application provides a kind of multi-pore high-precision filter device for treating oilfield oily sewage to solve the problems of prior art.

[0005] The multi-pore high-precision filter device for treating oilfield oily sewage of the present application is composed of a tank body, a water inlet pipe and a water outlet pipe are arranged on the upper and lower heads of the tank body respectively, a high-strength support hole plate is fixed in the lower part of the tank body, a large-flux sand-blocking sieve plate is fixed on the high-strength support hole plate, and a multi-pore ceramic filter material layer is laid on the large-flux sand-blocking sieve plate; a sand-blocking water distributor is arranged in the upper head corresponding to the water inlet pipe, one end of the water outlet pipe penetrates through the bottom of the tank body, is placed below the high-strength support hole plate, and a plurality of water distribution branch pipes are uniformly arranged on the outer wall of the high-strength support hole plate; a plurality of through holes I are arranged on the water distribution branch pipes; a plurality of high-frequency gas scrubbing devices are arranged in the multi-pore ceramic filter material layer; and the sand-blocking water distributor is composed of a sand-blocking sieve cylinder and a sand-blocking sieve cap, the upper end of the sand-blocking sieve cylinder is fixed to the inner wall of the top end of the tank body, and the lower end of the sand-blocking sieve cylinder is fixed to the sand-blocking sieve cap through a flange.

[0006] As a further improvement of the present application, the sand-blocking screen cylinder is composed of a high-strength water distribution inner lining pipe and an annular sand-blocking screen I fixed to the outer periphery of the pipe.

[0007] As a further improvement of the present application, the sand-blocking screen cylinder is composed of a high-strength water distribution inner lining pipe and an annular sand-blocking screen I fixed to the outer periphery of the pipe.

[0008] As a further improvement of the present application, the sand-blocking screen cylinder is composed of a high-strength water distribution inner lining pipe and an annular sand-blocking screen I fixed to the outer periphery of the pipe.

[0009] As a further improvement of the present application, the sand-blocking screen cylinder is composed of a high-strength water distribution inner lining pipe and an annular sand-blocking screen I fixed to the outer periphery of the pipe.

[0010] As a further improvement of the present application, the sand-blocking screen cylinder is composed of a high-strength water distribution inner lining pipe and an annular sand-blocking screen I fixed to the outer periphery of the pipe.

[0011] As a further improvement of the present application, the sand-blocking screen cylinder is composed of a high-strength water distribution inner lining pipe and an annular sand-blocking screen I fixed to the outer periphery of the pipe.

[0012] The present application is a kind of multi-microporous high-precision filter device for treating oilfield oily sewage, which is specially designed for the current ternary produced liquid. In this process, the multi-microporous high-precision filter device is used, which can improve the capacity of containing dirt, reduce the head of backwash pump, improve the filtering precision, and reduce the daily operation and maintenance cost. The multi-layer high-frequency gas rubbing washing device has the characteristics of low gas washing strength, high frequency, saving gas, and uniform gas distribution, which can effectively clean all the filter material in the whole filter bed without dead angle. The anti-blocking water distributor can effectively avoid the phenomenon of backwashing material running and pressure holding. The water quality of the whole sewage treatment process reaches the "double 10" index of oil and suspended solids, which meets the water inlet requirement of the subsequent nanometer filtration section. The water outlet of the nanometer filtration section can reach the "5, 5, 2" index of the deep treatment requirement of oily sewage. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure sectional view of the multi-microporous high-precision filter device of the present application.

[0014] Figure 2 It is a structure sectional view of the multi-microporous high-precision filter device of the present application.

[0015] Figure 3 Structure sectional view of sand guiding and blocking cap of the present application;

[0016] Figure 4 Structure schematic view of multi-layer high-frequency gas scrubbing device of the present application;

[0017] Figure 5 Structure schematic view of high-strength supporting hole plate, large-flux sand blocking sieve plate and water outlet pipe of the present application;

[0018] Figure 6 Process flow chart for treating oily sewage by using the multi-micropore high-precision filtering device of the present application. DETAILED DESCRIPTION

[0019] The multi-micropore high-precision filtering device for treating oily sewage of the present application is composed of a tank body 1. The lower head of the tank body 1 is seated on a supporting cylinder 2. A water inlet pipe 7 and a water outlet pipe 8 are respectively arranged on the upper head and the lower head of the tank body 1. Two or more than two annular water blocking baffles 25 are arranged on the inner wall of the vertical section of the tank body 1. An inspection hole is arranged on the outer wall of the vertical section of the tank body 1. A through hole IV 19 is arranged on the outer wall of the supporting cylinder 2. One end of the water outlet pipe 8 penetrates through the through hole IV 19 and is arranged outside the supporting cylinder 2. The other end of the water outlet pipe 8 penetrates through the bottom of the tank body 1 and is arranged below the high-strength supporting hole plate 3. A plurality of water distribution branch pipes 9 are uniformly arranged on the outer wall of the high-strength supporting hole plate 3. A plurality of through holes I 10 are arranged on the water distribution branch pipes 9.

[0020] In the tank 1, a high-strength supporting hole plate 3 is fixed at the lower part, a large-flux sand-blocking screen plate 4 is fixed on the high-strength supporting hole plate 3, and a multi-microporous ceramic filter material layer 5 is laid on the large-flux sand-blocking screen plate 4. The multi-microporous ceramic filter material layer 5 has a particle size of 1-3 mm, a porosity of more than 40%, and a breakage rate of less than 4%. The laying thickness is 2.5-3 m. The multi-microporous ceramic filter material has high filtering precision and surface adsorption capacity, and can ensure stable water quality. The multi-microporous ceramic filter material used in the device is made of high-quality kaolin, binder, pore-forming agent, and corrosion inhibitor through high-temperature calcination. The unique production process ensures a service life of 10 years for the filter material, and the breakage rate is less than 1%. The surface is hard, the internal porous network is crisscrossed, the porosity is high, and the adsorption capacity is strong. The filter material is not hardened and not adhered. After backwashing, the performance is restored to 100%. Compared with the traditional double-layer filter tank process, the device has multiple innovations, improved indicators, shortened and simplified filtering process, and can save energy by 50% and water by 70% during backwashing. Because the filter material contains pores of different sizes and rough surfaces, the pore size and gap of the filter micropores on each layer are different during the filtering process, so the filtering channel and gap are not straight lines but curves. It has the function of deep filtration or container filtration. When flowing through the changing channels and gaps, impurities larger than the average pore size are blocked outside the pores, and impurities smaller than the average pore size enter the channels. In each local area, the size of the pore size and gap changes, so the flow rate of the medium also changes. In addition, the irregular changes in the channel and gap make a part of the impurities smaller than the pore size be trapped and adsorbed by the side wall. The adsorbed impurities further increase the surface area and complexity of the structure of the filter material, so that even smaller impurities can be adsorbed, thereby greatly improving the filtering precision of the multi-microporous high-precision filter device and achieving good filtering effect. At the same time, the "multi-microporous ceramic material" filtering medium used has a low specific gravity, so it does not need a large-flow and high-lift backwashing water pump, saving one-time investment and reducing daily operation and maintenance costs. In addition, the multi-microporous ceramic filter material has the interception precision of membrane filtration and the simple structure and easy maintenance and operation characteristics of traditional sand filtration. The unique sintering process and surface coating process of the filtering medium can ensure the water quality when the water fluctuation is large, and can restore the original working state after being impacted by the system. The multi-microporous ceramic filter material has a large specific surface, strong pollution interception capacity, high water yield, stable water quality, and long filtering period.

[0021] The anti-blocking water distributor 6 is composed of a sand-blocking sieve cylinder 12 and a sand-guiding and sand-blocking sieve cap 13. The upper end of the sand-blocking sieve cylinder 12 is fixed to the inner wall of the top end of the tank body 1, and the lower end is fixed to the sand-guiding and sand-blocking sieve cap 13 through a flange. The sand-blocking sieve cylinder 12 is composed of a high-strength water distribution lining pipe 14 and an annular sand-blocking sieve net I 20 fixed to the high-strength water distribution lining pipe 14. The high-strength water distribution lining pipe 14 can support the sand-blocking sieve cylinder 12. A plurality of through holes II 15 are uniformly arranged on the high-strength water distribution lining pipe 14, and the size of the through holes II 15 can be determined according to the processing capacity and backwashing capacity. The sand-guiding and sand-blocking sieve cap 13 is a reverse circular truncated cone structure with a large upper end and a small lower end, and is composed of a high-strength water distribution lining cap 22 on the inner side and a sand-blocking sieve net II 21 on the outer side. The high-strength water distribution lining cap 22 has the same shape as the sand-blocking sieve net II 21. A plurality of through holes V 23 are uniformly arranged on the high-strength water distribution lining cap 22. The upper end of the sand-guiding and sand-blocking sieve cap 13 is fixed to and communicates with the sand-blocking sieve cylinder 12, and the lower end is blocked by a blocking plate 24. The high-strength steel lining hole is provided with a funnel-shaped sand-guiding and anti-blocking sieve plate, so that the water distribution is uniform, and the phenomena of backwashing material running and pressure holding can be effectively avoided.

[0022] A plurality of high-frequency gas washing devices 11 are arranged in the multi-microporous ceramic filter material layer 5. The high-frequency gas washing device 11 includes a gas distribution main pipe 16 and a gas distribution branch pipe 17. One end of the gas distribution main pipe 16 penetrates through the high-strength support hole plate 3 and the large-flux sand-blocking sieve plate 4 and is arranged in the multi-microporous ceramic filter material layer 5. Two layers of gas distribution branch pipes 17 are arranged on the outer wall of the gas distribution main pipe 16. More than one through hole III is arranged on each gas distribution branch pipe 17. A sand-blocking gas cap 18 is arranged on the through hole III. The gas inlet end of the gas distribution main pipe 16 penetrates through a through hole IV 19 and is arranged outside the support cylinder 2. The design of the multi-layer high-frequency gas washing device has low washing strength, high frequency, saves gas, and uniformly distributes gas. The filter material in the entire filter bed can be thoroughly washed without dead angles, and the longest backwashing period of the filter material can reach 72 hours.

[0023] The pore size of the annular sand-blocking sieve net I 20, the sand-blocking sieve net II 21 and the large-flux sand-blocking sieve plate 4 is smaller than the particle size of the multi-microporous ceramic filter material, which can prevent the multi-microporous ceramic filter material from flowing out of the pores during backwashing and causing waste of the multi-microporous ceramic filter material.

[0024] In the sewage treatment, the sewage after homogenization, viscosity reduction, removal of surface oil and part of emulsified oil in the oily sewage is injected into the intermediate water tank, the outlet of the intermediate water tank is connected with the pump, the sewage is injected into the multi-porous high-precision filter device from the inlet pipe 7, is uniformly distributed by the anti-blocking water distributor 6, is filtered by the forward flow through the multi-porous ceramic filter material layer 5, the oil and suspended solids in the oily sewage are intercepted and adsorbed by the multi-porous ceramic filter material, and the water filtered by the multi-porous ceramic filter material layer 5 is discharged from the outlet pipe 8 through the large-flux sand-blocking screen plate 4 and the high-strength supporting hole plate 3. The device adopts the multi-section high-frequency gas rubbing + water flushing mode for backwashing, when backwashing, the water flow with certain pressure is injected from the outlet pipe 8, flows out from the through hole I 10, reversely passes through the whole filter layer from the bottom of the multi-porous ceramic filter material layer 5 through the high-strength supporting hole plate 3 and the large-flux sand-blocking screen plate 4, so that the filter layer is in the expanded state, and part of the pollutants easy to be washed away can be washed away, then, the gas is distributed from the gas distribution main pipe 16 to the multi-porous ceramic filter material layer 5, the multi-porous ceramic filter material layer 5 is rubbed by the high-frequency gas, and finally the multi-porous ceramic filter material layer 5 is thoroughly cleaned, the backwashed sewage is discharged from the inlet pipe 7 through the anti-blocking water distributor 6, the anti-blocking water distributor 6 can effectively prevent the loss of the multi-porous ceramic filter material during backwashing, and the backwashing blockage phenomenon does not occur; the multi-section high-frequency gas-water combined backwashing mechanism can reduce the gas supply pressure of the gas supply unit, reduce the one-time investment and operation energy consumption, and utilize the force of the high-frequency gas and water on the filter layer to make the filter materials rub and wash each other, accelerate the destruction of the filter layer, and make the pollutants intercepted and adsorbed on the surface of the filter material discharged from the filter bed.

[0025] The multi-porous high-precision filter device for treating the oily sewage of the oil field is combined with other devices in the oily sewage treatment process to treat the sewage, as shown in Figure 6 The steps are as follows:

[0026] (1) The oily sewage is injected into the homogenization buffer tank for homogenization, then is injected into the high-efficiency viscosity reduction device, and the demulsifier is added into the high-efficiency viscosity reduction device according to the index of the oily sewage to oxidize and decompose the oily sewage and reduce the viscosity of the raw water;

[0027] (2) The oily sewage after viscosity reduction is injected into the water quality stabilizing device, at the same time, the flocculant is added into the water quality stabilizing device to remove the surface oil and part of the emulsified oil in the oily sewage, then the surface oil, part of the emulsified oil and the bottom mud in the water quality stabilizing device are recovered into the recovery pool;

[0028] (3) The sewage treated by the water quality stabilizing device is lifted to the multi-porous high-precision filter device through the intermediate water tank, and the oil and suspended solids in the sewage are adsorbed and removed by the multi-porous ceramic filter material layer in the device;

[0029] (4) The wastewater treated by the multi-porous high-precision filter device is fed into the nanometer filter device through the buffer water tank for filtration, and the filtered water is stored in the clean water tank;

[0030] (5) The water stored in the clean water tank can be used as backwashing water of the nanometer filter device and chemical washing water of the nanometer filter device, and the water after backwashing and chemical washing is finally recovered into the high-efficiency viscosity reduction device;

[0031] (6) The buffer water tank performs backflushing on the multi-porous high-precision filter device;

[0032] (7) The air washing system provides air sources for the multi-porous high-precision filter device and the nanometer filter device.

[0033] The above process is that the effluent from the two-stage settling tank in the oil-containing wastewater treatment station is fed into the high-efficiency viscosity reduction section for oxidation and decomposition treatment to reduce the viscosity of the raw water and reduce the treatment burden of the subsequent process. The effluent from the high-efficiency viscosity reduction section flows to the water quality stabilization section. After entering the water quality stabilization section, the surface floating oil and part of the emulsified oil in the oil-containing wastewater are removed. The effluent from the water quality stabilization section is fed into the multi-porous high-precision filtration section through the buffer intermediate water tank to remove the oil and suspended solids in the oil-containing wastewater. The effluent water quality reaches the "double 10" index of oil and suspended solids to meet the water inlet requirement of the subsequent nanometer filter section. The effluent from the nanometer filter section can reach the "5, 5, 2" index of the oil-containing wastewater advanced treatment requirement.

Claims

1. A multi-microporous high-precision filtration device for treating oily wastewater from oil fields, comprising a tank (1), wherein the lower end of the tank (1) sits on a support cylinder (2), and an inlet pipe (7) and an outlet pipe (8) are respectively provided on the upper and lower end of the tank (1), characterized in that: A high-strength support perforated plate (3) is fixed in the lower part of the tank body (1). A high-throughput sand-blocking screen plate (4) is fixed on the high-strength support perforated plate (3). A multi-microporous ceramic filter material layer (5) is laid on the high-throughput sand-blocking screen plate (4). The particle size of the multi-microporous ceramic filter material layer 5 is 1-3 mm, the porosity is greater than 40%, the breakage rate is less than 4%, and the laying thickness is 2.5-3 meters. A water distribution device (6) is provided in the upper end cap, corresponding to the water inlet pipe (7). One end of the water outlet pipe (8) penetrates the bottom of the tank body (1), is placed below the high-strength support perforated plate (3), and multiple water distribution branch pipes (9) are evenly arranged around its outer wall. There are multiple through holes I (10); a multi-layer high-frequency gas scrubbing device (11) is provided in the multi-microporous ceramic filter layer (5); the multi-layer high-frequency gas scrubbing device (11) includes a gas distribution main pipe (16) and a gas distribution branch pipe (17). One end of the gas distribution main pipe (16) passes through the high-strength support plate (3) and the large-flow sand-blocking screen plate (4) and is placed in the multi-microporous ceramic filter layer (5). More than one layer of gas distribution branch pipes (17) are provided around the outer wall of the gas distribution main pipe (16). More than one through hole III is provided on the gas distribution branch pipe (17). Sand-blocking gas distribution cap (18) is provided on the through hole III. The air inlet end of the gas distribution main pipe (16) is placed outside the tank body (1). The anti-blocking water distributor (6) is composed of a sand blocking screen cylinder (12) and a sand guiding and sand blocking screen cap (13). The upper end of the sand blocking screen cylinder (12) is fixed to the inner wall of the top of the tank body (1), and the lower end is fixed to the sand guiding and sand blocking screen cap (13) through a flange. The sand-blocking screen cylinder (12) is formed by covering the outer circumference of the high-strength water distribution inner liner pipe (14) with an annular sand-blocking screen I (20) fixed therewith. The high-strength water distribution inner liner pipe (14) is provided with multiple through holes II (15). The sand guiding and blocking screen cap (13) is formed by fixing the inner high-strength water distribution inner liner cap (22) and the outer sand blocking screen II (21) together. The high-strength water distribution inner liner cap (22) is provided with multiple through holes V (23). The sand guiding and blocking screen cap (13) is an inverted frustum structure. Its upper opening is fixed and connected to the sand blocking screen cylinder (12), and its lower end is blocked by a baffle plate (24).

2. The multi-microporous high-precision filtration device for treating oily wastewater from oil fields according to claim 1, characterized in that... The thickness of the multi-microporous ceramic filter layer (5) is 2.5 to 3 meters.

3. The multi-microporous high-precision filtration device for treating oily wastewater from oil fields according to claim 1, characterized in that... The outer wall of the support cylinder (2) is provided with a through hole IV (19), and one end of the water outlet pipe (8) and the air distribution main pipe (16) passes through the through hole IV (19) and is placed outside the support cylinder (2).

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