CN120923095A - Oilfield produced water treatment system and treatment process - Google Patents
Oilfield produced water treatment system and treatment processInfo
- Publication number
- CN120923095A CN120923095A CN202511399755.8A CN202511399755A CN120923095A CN 120923095 A CN120923095 A CN 120923095A CN 202511399755 A CN202511399755 A CN 202511399755A CN 120923095 A CN120923095 A CN 120923095A
- Authority
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- China
- Prior art keywords
- module
- tank
- deoiling
- swash plate
- water
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Classifications
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- 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
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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)
- Physical Water Treatments (AREA)
Abstract
本发明公开了一种油田采出水水处理系统及处理工艺，涉及油田采出水处理技术领域，污泥浓缩模块用于对油田采出水进行固液分离，并使油田采出水中的污泥沉降，污泥浓缩模块分离出的上清液能够通入至压力斜板除油模块内，且压力斜板除油模块用于对上清液进行除油除悬浮物，并使油漂浮于最上层、悬浮物自然沉降于最下层，压力斜板除油模块分离后得到的处理水能够通入至过滤模块内，且过滤模块用于对处理水进行过滤，并进一步去除处理水中的油和悬浮物以得到回注水，污油回收模块用于回收污泥浓缩模块、压力斜板除油模块以及过滤模块中的污油污水。本发明能够提高油田采出水的处理效率和处理效果。
This invention discloses an oilfield produced water treatment system and process, relating to the field of oilfield produced water treatment technology. A sludge thickening module is used for solid-liquid separation of the oilfield produced water and to allow sludge in the produced water to settle. The supernatant separated by the sludge thickening module can be passed into a pressure inclined plate oil removal module, which removes oil and suspended solids from the supernatant, allowing oil to float to the top layer and suspended solids to settle naturally to the bottom layer. The treated water obtained after separation by the pressure inclined plate oil removal module can be passed into a filtration module, which filters the treated water and further removes oil and suspended solids to obtain reinjection water. A waste oil recovery module is used to recover waste oil and wastewater from the sludge thickening module, the pressure inclined plate oil removal module, and the filtration module. This invention can improve the treatment efficiency and effect of oilfield produced water.
Description
Technical Field
The invention relates to the technical field of oilfield produced water treatment, in particular to an oilfield produced water treatment system and a treatment process.
Background
With the continuous deep exploitation of oil fields, most of the oil fields enter a high water-containing period at present, and in order to maintain the pressure of oil reservoirs and improve the recovery ratio, the oil field produced water needs to be reinjected. The oilfield produced water is mainly formation associated water produced along with oil gas in the oil gas exploitation process, has the characteristics of high salinity, high oil content, high suspended matters and the like, and needs to be pretreated to meet corresponding water quality standards in order to avoid pollution to underground water resources and ensure the quality of reinjection water and oil reservoir effect.
However, in the prior art, equipment special for treating oilfield produced water is lacked, and when conventional water treatment equipment is used for treating oilfield produced water, the problems of poor treatment effect and low treatment efficiency exist.
Disclosure of Invention
The invention aims to provide an oilfield produced water treatment system and a oilfield produced water treatment process, which are used for solving the problems in the prior art and improving the oilfield produced water treatment efficiency and treatment effect.
In order to achieve the above object, the present invention provides the following solutions:
The invention provides an oilfield produced water treatment system which comprises a sludge concentration module, a pressure inclined plate deoiling module, a filtering module and a dirty oil recovery module, wherein the sludge concentration module is used for carrying out solid-liquid separation on oilfield produced water and settling sludge in the oilfield produced water, supernatant separated by the sludge concentration module can be introduced into the pressure inclined plate deoiling module, the pressure inclined plate deoiling module is used for deoiling supernatant and removing suspended matters, oil floats on the uppermost layer and suspended matters naturally settle on the lowermost layer, treated water obtained after separation of the pressure inclined plate deoiling module can be introduced into the filtering module, the filtering module is used for filtering the treated water and further removing oil and suspended matters in the treated water to obtain reinjection water, and the dirty oil recovery module is used for recovering dirty oil and sewage in the sludge concentration module, the pressure inclined plate deoiling module and the filtering module.
Preferably, the sludge concentration module comprises a sludge concentration tank, a central cyclone sludge distributor, a diversion refractor and a sludge concentration pump, wherein the sludge concentration pump is used for carrying out solid-liquid separation on oilfield produced water in the sludge concentration tank, a water inlet used for leading in oilfield produced water is formed in the upper part of the sludge concentration tank, a sludge outlet used for reducing the flow rate of the sludge discharged from the sludge concentration tank is formed in the bottom of the sludge concentration tank, the sludge outlet can be communicated with the dirty oil recovery module, a supernatant outlet used for discharging separated supernatant is further formed in the middle of the sludge concentration tank, the supernatant outlet of the sludge concentration tank can be communicated with the pressure inclined plate oil removal module, the central cyclone sludge distributor is installed in the sludge concentration tank, the upper end of the central cyclone sludge distributor is communicated with the water inlet of the sludge concentration tank, the lower end of the central cyclone sludge distributor extends to the middle of the sludge concentration tank, the upper end of the diversion refractor can be installed at the upper end of the diversion refractor and the upper end of the diversion refractor is far away from the sludge distributor, and the upper end of the diversion refractor can be connected with the sludge collector in parallel to the lower end of the sludge concentration tank, and the upper end of the diversion refractor can be connected with the upper end of the sludge distributor is far away from the upper end of the sludge distributor.
Preferably, the longitudinal section of the diversion refractor is trapezoid, the sectional area of the diversion refractor gradually increases from top to bottom, and the side wall of the diversion refractor is an inclined plane.
Preferably, the pressure swash plate deoiling module comprises a primary pressure swash plate deoiling sledge and a secondary pressure swash plate deoiling sledge, wherein a supernatant inlet of the primary pressure swash plate deoiling sledge can be communicated with a supernatant outlet of the sludge concentration tank, a treated water outlet of the primary pressure swash plate deoiling sledge can be communicated with a treated water inlet of the secondary pressure swash plate deoiling sledge, and a treated water outlet of the secondary pressure swash plate deoiling sledge can be communicated with the filtering module.
Preferably, the one-level pressure swash plate deoiling sledge is including parallelly connected two one-level pressure swash plates that set up except that the oil tank, the inner chamber of one-level pressure swash plate except that the oil tank is divided into one-level cyclonic separation district, one-level natural sedimentation district, nanometer coalescence deoiling district and one-level swash plate coalescence deoiling district, one-level cyclonic separation district is close to one-level pressure swash plate except that the treated water import of oil tank sets up, just be equipped with in the one-level cyclonic separation district with one-level cyclonic separation ware that one-level pressure swash plate except that the treated water import intercommunication of oil tank, one-level natural sedimentation district is located one-level pressure swash plate except that the bottom of oil tank, nanometer coalescence deoiling district is located one-level cyclonic separation district is keeping away from one-level pressure swash plate except that one side of supernatant import of oil tank, just be equipped with one-level pressure swash plate in the nanometer coalescence district, one-level pressure swash plate except that the oil tank except that a plurality of oil inlets for being used for the recovery oil, one-level swash plate except that the oil tank is equipped with a plurality of oil inlets for discharging suspended solid at the lower extreme, one-level swash plate except that the oil tank is equipped with two opposite side wall respectively and is equipped with the drain that the supernatant fluid import and can also be carried out the drain.
Preferably, the secondary pressure swash plate deoiling sledge includes two secondary pressure swash plate deoiling tanks that the parallelly connected set up, the inner chamber of secondary pressure swash plate deoiling tank divide into secondary cyclonic separation district, secondary natural sedimentation district and secondary swash plate coalescence deoiling district, the secondary cyclonic separation district is close to the processing water import setting of secondary pressure swash plate deoiling tank, just be equipped with in the secondary cyclonic separation district with the secondary cyclonic separator of the processing water import intercommunication of secondary pressure swash plate deoiling tank, secondary natural sedimentation district is located the bottom of secondary pressure swash plate deoiling tank, be equipped with the secondary pressure swash plate in the secondary swash plate coalescence deoiling district, the secondary pressure swash plate deoiling tank is equipped with a plurality of oil inlets that are used for retrieving oil in the upper end, the secondary pressure swash plate deoiling tank is equipped with a plurality of drain ports that are used for discharging sedimentation suspended solid, the secondary pressure deoiling tank is equipped with supernatant import and processing water export respectively on opposite both sides wall, the drain port department that the secondary pressure deoiled tank can also carry out.
Preferably, the inner diameter of the primary cyclone separator is smaller than that of the secondary cyclone separator, the flow direction of the supernatant in the primary cyclone separator is from top to bottom, the supernatant passes through the primary pressure inclined plate from bottom to top, the flow direction of the treated water in the secondary cyclone separator is from bottom to top, and the treated water passes through the secondary pressure inclined plate from top to bottom.
Preferably, the filter module comprises a plurality of multi-medium filters arranged in parallel, the multi-medium filters comprise a filter tank, a water distributor, a water inlet pipe, a filter material layer, a water outlet pipe and a screen pipe, wherein the water distributor, the water inlet pipe, the filter material layer, the water outlet pipe and the screen pipe are arranged in the filter tank, one end of the water inlet pipe is communicated with the pressure inclined plate deoiling module, the other end of the water inlet pipe is connected with the water distributor, the water distributor is arranged at the top in the filter tank, the filter material layer is arranged below the water distributor, the screen pipe is arranged below the filter material layer, the screen pipe is communicated with one end of the water outlet pipe, the other end of the water outlet pipe is communicated with the outside, the upper end of the filter tank is further provided with an oil collecting port for recovering oil, the filter material layer comprises an upper anthracite filter material, a middle layer of diamond filter material and a lower layer of pebble cushion layer, and the multi-medium filters can also perform back flushing.
Preferably, the dirty oil recovery module comprises a dirty oil recovery tank and two horizontal centrifugal pumps, wherein an oil outlet and an oil return port are arranged on the dirty oil recovery tank, one horizontal centrifugal pump is respectively arranged at the oil outlet and the oil return port, and a sacrificial anode block is further arranged in the dirty oil recovery tank.
The invention also provides an oilfield produced water treatment process, which adopts any one of the technical schemes, and comprises the following steps:
The method comprises the steps of feeding oil field produced water into a sludge concentration module for sludge concentration, floating the concentrated oil to the top of the sludge concentration module for oil recovery, settling the sludge in the oil field produced water to the bottom of the sludge concentration module, feeding supernatant obtained in the sludge concentration module into a pressure inclined plate deoiling module, deoiling and removing suspended matters in the pressure inclined plate deoiling module to obtain treated water, feeding the treated water obtained in the pressure inclined plate deoiling module into a filtering module for filtering to further deoiling and removing suspended matters, so that the treated water meets the water quality requirement of oilfield reinjection water, and recovering dirty oil and sewage by using a dirty oil recovery module and temporarily storing the dirty oil and sewage in the process of treating the oil field produced water so as to provide a continuous and stable water source for a rear-end conveying or recycling system.
Compared with the prior art, the invention has the following technical effects:
The invention provides an oilfield produced water treatment system and a treatment process, comprising a sludge concentration module, a pressure inclined plate deoiling module, a filtering module and a dirty oil recovery module, wherein the sludge concentration module is used for carrying out solid-liquid separation on oilfield produced water and enabling sludge in the oilfield produced water to be settled, so that oil, water and sludge are primarily separated, supernatant separated by the sludge concentration module can be introduced into the pressure inclined plate deoiling module, the pressure inclined plate deoiling module is used for deoiling supernatant and removing suspended matters, oil floats on the uppermost layer and suspended matters naturally settle on the lowermost layer, further treatment on supernatant is realized, the treated water obtained after separation of the pressure inclined plate deoiling module can be introduced into the filtering module, the filtering module is used for filtering the treated water and further removing oil and suspended matters in the treated water to obtain reinjection water, and the dirty oil recovery module is used for recovering the dirty oil and sewage in the sludge concentration module, the pressure inclined plate deoiling module and the filtering module, and further the water quality treatment is carried out step by step on oilfield produced water, the requirement of reinjection water is met, and the treatment efficiency of the treated supernatant can be improved, meanwhile, the oil floats on the uppermost layer and suspended matters naturally settle on the lowermost layer, further the supernatant can be conveniently adjusted to the water quality of the oilfield produced water, the equipment can be conveniently adjusted in the field after the installation stage, the process is convenient, the equipment is convenient to be adjusted, and the equipment is convenient to be replaced, and the equipment is convenient in the on the installation stage, and the maintenance stage is convenient, and the quality can be adjusted, and the quality can be adjusted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a sludge concentration module according to an embodiment;
FIG. 2 is a schematic diagram of the structure of a first-stage pressure swash plate oil removal sled according to the first embodiment;
FIG. 3 is a schematic diagram of a two-stage pressure swash plate oil removal sled according to the first embodiment;
FIG. 4 is a schematic diagram of a filter module according to the first embodiment;
FIG. 5 is a schematic diagram of the water distributor arrangement of FIG. 4;
FIG. 6 is a schematic illustration of the screen arrangement of FIG. 4;
In the figure, a 100-sludge concentration module, a 200-primary pressure inclined plate degreasing sledge, a 300-secondary pressure inclined plate degreasing sledge, a 400-filtering module, a 1-sludge concentration tank, a 2-central cyclone sludge distributor, a 3-diversion refractor, a 4-sludge bucket, a 5-primary pressure inclined plate degreasing tank, a 6-primary cyclone separation area, a 7-primary cyclone separator, an 8-primary natural sedimentation area, a 9-nanometer coalescence degreasing area, a 10-hollow sphere, a 11-primary inclined plate coalescence degreasing area, a 12-primary pressure inclined plate, a 13-secondary pressure inclined plate degreasing tank, a 14-secondary cyclone separation area, a 15-secondary cyclone separator, a 16-secondary natural sedimentation area, a 17-secondary inclined plate coalescence degreasing area, a 18-secondary pressure inclined plate, a 19-filtering tank, a 20-water inlet pipe, a 21-water distributor, a 22-water outlet pipe, a 23-sieve pipe and a 24-filter layer are shown.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an oilfield produced water treatment system and a oilfield produced water treatment process, which are used for solving the problems existing in the prior art and improving the treatment efficiency and the treatment effect of oilfield produced water.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1-6, the embodiment provides an oilfield produced water treatment system, which comprises a sludge concentration module 100, a pressure inclined plate deoiling module, a filtering module 400 and a dirty oil recovery module, wherein the sludge concentration module 100 is used for carrying out solid-liquid separation on oilfield produced water and settling sludge in the oilfield produced water so as to carry out preliminary separation on oil, water and sludge, supernatant separated by the sludge concentration module 100 can be introduced into the pressure inclined plate deoiling module, the pressure inclined plate deoiling module is used for deoiling and removing suspended matters, oil floats on the uppermost layer and suspended matters naturally settle on the lowermost layer, further treatment on the supernatant is realized, the treated water obtained after the separation of the pressure inclined plate deoiling module can be introduced into the filtering module 400, the filtering module 400 is used for filtering the treated water, and further removing oil and suspended matters in the treated water so as to obtain reinjection water, the dirty oil recovery module is used for recovering the sludge concentration module 100, the pressure inclined plate and the dirty oil and sewage in the filtering module 400, the water quality after the treatment can be further ensured, the water quality after the treatment is improved, the water quality of the treated water quality can be quickly removed, the water quality can be improved, the water quality can be conveniently and the water quality can be easily adjusted, the water quality can be easily and the oilfield can be easily adjusted, the field can be easily and the field can be easily replaced, the equipment can be easily and the required to be easily and the field can be easily replaced, and the field can be easily be adjusted and replaced.
Specifically, the sludge concentration module 100 comprises a sludge concentration tank 1, a central rotational flow sludge distributor 2, a diversion refractor 3 and a sludge concentration pump, wherein the sludge concentration pump is used for carrying out solid-liquid separation on oilfield produced water in the sludge concentration tank 1 and enabling sludge to settle at the bottom of the sludge concentration tank 1, a water inlet for the oilfield produced water to flow in is arranged at the upper part of the sludge concentration tank 1, a sludge outlet for discharging sludge is arranged at the bottom of the sludge concentration tank 1 and realizing collection of settled sludge, the sludge outlet can be communicated with a dirty oil recovery module so as to recover sludge and sewage into the dirty oil recovery module, a supernatant outlet for discharging separated supernatant is also arranged at the middle part of the sludge concentration tank 1, the supernatant outlet of the sludge concentration tank 1 can be communicated with a pressure inclined plate oil removal module so as to facilitate the separated supernatant to flow into the pressure inclined plate oil removal module for further oil removal and suspended solids removal, the central rotational flow mud distributor 2 is arranged in the sludge concentration tank 1, the upper end of the central rotational flow mud distributor 2 is communicated with the water inlet of the sludge concentration tank 1, so that the oilfield produced water enters the sludge concentration tank 1 through the water inlet of the sludge concentration tank 1 and then enters the central rotational flow mud distributor 2 first, the flow speed is reduced through the central rotational flow mud distributor 2, the lower end of the central rotational flow mud distributor 2 extends to the middle part of the sludge concentration tank 1, the upper end of the diversion refractor 3 is arranged at the lower end of the central rotational flow mud distributor 2, the diversion refractor 3 can enable the sludge in the oilfield produced water to extend downwards and in the direction away from the axis of the central rotational flow mud distributor 2, the sludge flow direction is changed, a sludge hopper 4 is formed at the lower part of the sludge concentration tank 1 and is used for collecting the separated sludge, the sludge hopper 4 is preferably in an inverted cone shape, a sludge outlet is formed at the lowermost end of the sludge hopper 4, the sludge concentration modules 100 are arranged in parallel, so that the treatment efficiency of the oilfield produced water can be improved, and uninterrupted treatment of the oilfield produced water can be realized when one of the sludge concentration modules 100 is overhauled.
The longitudinal section of the diversion refractor 3 is trapezoid, the sectional area of the diversion refractor 3 is gradually increased from top to bottom, and the side wall of the diversion refractor 3 is an inclined plane, so that the sludge can be guided.
The pressure swash plate deoiling module comprises a first-stage pressure swash plate deoiling sledge 200 and a second-stage pressure swash plate deoiling sledge 300, wherein a supernatant inlet of the first-stage pressure swash plate deoiling sledge 200 can be communicated with a supernatant outlet of the sludge concentration tank 1, a treated water outlet of the first-stage pressure swash plate deoiling sledge 200 can be communicated with a treated water inlet of the second-stage pressure swash plate deoiling sledge 300, a treated water outlet of the second-stage pressure swash plate deoiling sledge 300 can be communicated with the filtering module 400, and then supernatant obtained after treatment of the sludge concentration module 100 is treated by the first-stage pressure swash plate deoiling sledge 200, treated water obtained after treatment of the second-stage pressure swash plate deoiling sledge 300 is then introduced into the filtering module 400 for filtering, and the treatment efficiency of oilfield produced water can be improved through multistage deoiling and suspended matter removal treatment.
The primary pressure inclined plate oil removal sledge 200 comprises two primary pressure inclined plate oil removal tanks 5 which are arranged in parallel, can treat the treated water at the same time, improves the treatment efficiency, the inner cavity of the primary pressure inclined plate oil removal tank 5 is divided into a primary cyclone separation zone 6, a primary natural sedimentation zone 8, a nano coalescence oil removal zone 9 and a primary inclined plate coalescence oil removal zone 11, the primary cyclone separation zone 6 is arranged close to a treated water inlet of the primary pressure inclined plate oil removal tank 5, a primary cyclone separator 7 which is communicated with the treated water inlet of the primary pressure inclined plate oil removal tank 5 is arranged in the primary cyclone separation zone 6, the treated water is further introduced into the primary cyclone separator 7, oil drops and fine suspended matters float to an oil receiving tank at the upper end of the primary pressure inclined plate oil removal tank 5 by taking bubbles as carriers under the action of gravity and centrifugal force, and the suspended matters of large particles sink under the action of gravity, the primary natural sedimentation zone 8 is positioned at the bottom of the primary pressure inclined plate oil removal tank 5, the nano coalescence oil removal zone 9 is positioned at one side of the primary cyclone separation zone 6, which is far away from the supernatant inlet of the primary pressure inclined plate oil removal tank 5, a plurality of hollow spheres 10 are arranged in the nano coalescence oil removal zone 9, the primary pressure inclined plate 12 is arranged in the primary inclined plate coalescence oil removal zone 11, so that the treated water obtained after the separation of the primary cyclone separator 7 sequentially passes through the hollow spheres 10 and the primary pressure inclined plate 12, tiny oil drops are coalesced to form large oil drops by the synergistic effect of the hollow spheres 10 and the primary pressure inclined plate 12, bubbles are taken as carriers to float to an oil collection tank, and the suspended matters of the large particles continuously sink under the action of self gravity to realize the further separation of oil, water and suspended matters, the separated treated water can enter the secondary pressure inclined plate oil removal sledge 300 for further treatment, the primary pressure inclined plate oil removal tank 5 is equipped with a plurality of oil receiving ports that are used for retrieving oil at the upper end, realize the recovery of oil, the primary pressure inclined plate oil removal tank 5 is equipped with a plurality of drain that are used for discharging sedimentation suspended solid at the lower extreme, realize the collection of sedimentation large granule suspended solid, the primary pressure inclined plate oil removal tank 5 is equipped with supernatant import and treated water export respectively on opposite both sides wall, realize letting in and leading-out of treated water, the drain department of primary pressure inclined plate oil removal tank 5 can also wash sand, the flange department through the drain top intakes, clear away tank bottom deposit mud, and then avoid drain department to block up, influence the blowdown function.
The secondary pressure inclined plate deoiling sledge 300 comprises two secondary pressure inclined plate deoiling tanks 13 which are arranged in parallel, the inner cavity of each secondary pressure inclined plate deoiling tank 13 is divided into a secondary cyclone separation area 14, a secondary natural sedimentation area 16 and a secondary inclined plate coalescent deoiling area 17, the secondary cyclone separation area 14 is close to a treated water inlet of each secondary pressure inclined plate deoiling tank 13, a secondary cyclone separator 15 which is communicated with the treated water inlet of each secondary pressure inclined plate deoiling tank 13 is arranged in each secondary cyclone separation area 14, the secondary natural sedimentation area 16 is positioned at the bottom of each secondary pressure inclined plate deoiling tank 13, a secondary pressure inclined plate 18 is arranged in each secondary inclined plate coalescent deoiling area 17, oil drops float to an oil collecting tank by taking bubbles as carriers through the cyclone separation effect of the secondary cyclone separator 15 and the coalescence oil beads of the secondary pressure inclined plate 18, the suspended matters of large particles sink by self gravity, so that further separation of oil, water and suspended matters is realized, the separation effect is improved, the secondary pressure inclined plate oil removal tank 13 is provided with a plurality of oil receiving ports for recovering oil at the upper end, oil recovery is realized, the secondary pressure inclined plate oil removal tank 13 is provided with a plurality of sewage outlets for discharging the settled suspended matters at the lower end, collection of the settled large-particle suspended matters is realized, the secondary pressure inclined plate oil removal tank 13 is respectively provided with a supernatant fluid inlet and a treated water outlet on two opposite side walls, introduction and export of treated water are realized, sand flushing can be further carried out at the sewage outlet of the secondary pressure inclined plate oil removal tank 13, water is fed through a flange above the sewage outlet, deposited sludge at the bottom of the tank is removed, and further blockage at the sewage outlet is avoided, and the sewage draining function is influenced.
In this embodiment, the primary pressure swash plate oil removal skid 200 is mainly used for removing oil in the treated water, and the primary pressure swash plate oil removal skid 200 is designed so that the inner diameter of the primary cyclone 7 is smaller than the inner diameter of the secondary cyclone 15, the flow direction of the supernatant in the primary cyclone 7 is from top to bottom, the supernatant passes through the primary pressure swash plate 12 from bottom to top, the flow direction of the treated water in the secondary cyclone 15 is from bottom to top, and the treated water passes through the secondary pressure swash plate 18 from top to bottom.
The filtration module 400 comprises a plurality of multi-medium filters which are arranged in parallel, the filtration efficiency can be improved through the arrangement of the plurality of multi-medium filters, the multi-medium filters comprise a filtration tank 19, and a water distributor 21, a water inlet pipe 20, a filter material layer 24, a water outlet pipe 22 and a screen pipe 23 which are arranged in the filtration tank 19, one end of the water inlet pipe 20 is communicated with a pressure inclined plate degreasing module, the other end of the water inlet pipe 20 is connected with the water distributor 21, the water distributor 21 is arranged at the top in the filtration tank 19, the filter material layer 24 is positioned below the water distributor 21, so that treated water can be introduced into the water distributor 21 through the water inlet pipe 20, the water distributor 21 can uniformly distribute water, the treated water can be ensured to be uniformly sprinkled on the filter material layer 24, meanwhile, the arrangement of the water distributor 21 can also prevent the filter material in the filter material layer 24 from being discharged through the water inlet pipe 20, the screen pipe 23 is communicated with one end of the water outlet pipe 22, the water outlet pipe 22 can be blocked from being discharged through the water outlet pipe 22, the other end of the water outlet pipe 22 can be communicated with the outside, and the upper end of the filtration tank 19 is also provided with an oil collecting port for recovering oil, so as to realize the collection of the oil; the filter material layer 24 comprises an upper anthracite filter material layer, a middle diamond filter material layer and a lower pebble cushion layer which are arranged up and down, oil and suspended matters in the treated water are further removed through various actions such as resistance interception, gravity sedimentation and deep bed filtration, and the filter materials of all layers can be automatically distributed under the action of self gravity, so that the upper anthracite filter material layer, the middle diamond filter material layer and the lower pebble cushion layer are sequentially stacked in the vertical direction and sequentially realize the filtration of the treated water, thus, the multi-media filter can also be backwashed, for example, by introducing water into the filter tank 19 at the reinjection water outlet and directing the water out through the treated water inlet, to effect backwashed of each layer of filter material.
The dirty oil recovery module comprises a dirty oil recovery tank and two horizontal centrifugal pumps, wherein an oil outlet and an oil return opening are arranged on the dirty oil recovery tank, and the horizontal centrifugal pumps are respectively arranged at the oil outlet and the oil return opening, so that the dirty oil recovery tank can be used for temporary storage and buffering of dirty oil and sewage, continuous and stable water sources are provided for a rear-end conveying or recycling system through stable volume space balance front-end water treatment equipment, sacrificial anode blocks such as zinc-based or aluminum-based are further arranged in the dirty oil recovery tank, parent metals of the dirty oil recovery tank are protected through an electrochemical corrosion prevention principle, and the service life of the equipment is prolonged.
Example two
The embodiment provides an oilfield produced water treatment process, which uses the oilfield produced water treatment system in the first embodiment, and comprises the following steps of introducing oilfield produced water into a sludge concentration module 100 for sludge concentration, floating the concentrated oil to the top of the sludge concentration module 100 so as to receive oil, settling the sludge in the oilfield produced water to the bottom of the sludge concentration module 100, introducing supernatant obtained in the sludge concentration module 100 into a pressure inclined plate deoiling module, carrying out deoiling and suspension removing treatment in the pressure inclined plate deoiling module to obtain treated water, introducing the treated water obtained in the pressure inclined plate deoiling module into a filtering module 400 for filtering to further deoiling and suspension removing, so that the treated water quality meets the water quality requirement of oilfield reinjection, and recovering dirty oil and sewage by using a dirty oil recovery module and temporarily storing the dirty oil and the sewage in the process of treating the oilfield produced water so as to provide a continuous and stable water source for a rear-end conveying or recycling system.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided herein to facilitate understanding of the principles and embodiments of the present invention and to provide further advantages and practical applications for those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The system is characterized by comprising a sludge concentration module, a pressure inclined plate deoiling module, a filtering module and a dirty oil recovery module, wherein the sludge concentration module is used for carrying out solid-liquid separation on oilfield produced water and settling sludge in the oilfield produced water, supernatant separated by the sludge concentration module can be introduced into the pressure inclined plate deoiling module, the pressure inclined plate deoiling module is used for deoiling supernatant and removing suspended matters, oil floats on the uppermost layer and suspended matters naturally settle on the lowermost layer, treated water obtained after separation of the pressure inclined plate deoiling module can be introduced into the filtering module, the filtering module is used for filtering the treated water and further removing oil and suspended matters in the treated water to obtain reinjection water, and the dirty oil recovery module is used for recovering dirty oil and sewage in the sludge concentration module, the pressure inclined plate deoiling module and the filtering module.
2. The oilfield produced water treatment system according to claim 1, wherein the sludge concentration module comprises a sludge concentration tank, a central cyclone sludge distributor, a diversion refractor and a sludge concentration pump, wherein the sludge concentration pump is used for carrying out solid-liquid separation on oilfield produced water in the sludge concentration tank, a water inlet used for introducing oilfield produced water is arranged at the upper part of the sludge concentration tank, a sludge outlet used for discharging sludge is arranged at the bottom of the sludge concentration tank, the sludge outlet can be communicated with the dirty oil recovery module, a supernatant outlet used for discharging separated supernatant is further arranged at the middle part of the sludge concentration tank, the supernatant outlet of the sludge concentration tank can be communicated with the pressure inclined plate oil removal module, the central cyclone sludge distributor is arranged in the sludge concentration tank, the upper end of the central cyclone sludge distributor is communicated with the water inlet of the sludge concentration tank, the lower end of the central cyclone sludge distributor extends to the middle part of the sludge concentration tank, the central cyclone sludge distributor is used for reducing the flow rate of the oilfield produced water, and the diversion refractor is arranged at the lower end of the water inlet of the sludge concentration tank, and the diversion refractor is arranged at the lower end of the central cyclone sludge distributor is far away from the central sludge distributor, and the sludge collector is arranged at the lower end of the central sludge distributor and is arranged at the central sludge distributor.
3. The oilfield produced water treatment system of claim 2, wherein the longitudinal section of the diversion refractor is trapezoidal, the sectional area of the diversion refractor gradually increases from top to bottom, and the side wall of the diversion refractor is an inclined plane.
4. The oilfield produced water treatment system of claim 1, wherein the pressure swash plate deoiling module comprises a primary pressure swash plate deoiling sledge and a secondary pressure swash plate deoiling sledge, wherein a supernatant inlet of the primary pressure swash plate deoiling sledge can be communicated with a supernatant outlet of the sludge concentration tank, a treated water outlet of the primary pressure swash plate deoiling sledge can be communicated with a treated water inlet of the secondary pressure swash plate deoiling sledge, and a treated water outlet of the secondary pressure swash plate deoiling sledge can be communicated with the filtering module.
5. The oilfield produced water treatment system according to claim 4, wherein the primary pressure swash plate deoiling sledge comprises two primary pressure swash plate deoiling tanks arranged in parallel, an inner cavity of the primary pressure swash plate deoiling tank is divided into a primary cyclone separation area, a primary natural sedimentation area, a nano coalesced deoiling area and a primary swash plate coalesced deoiling area, the primary cyclone separation area is arranged close to a treated water inlet of the primary pressure swash plate deoiling tank, a primary cyclone separator communicated with the treated water inlet of the primary pressure swash plate deoiling tank is arranged in the primary cyclone separation area, the primary natural sedimentation area is positioned at the bottom of the primary pressure swash plate deoiling tank, the nano coalesced deoiling area is positioned at one side of the primary cyclone separation area away from a supernatant inlet of the primary pressure swash plate deoiling tank, a plurality of hollow spheres are arranged in the nano coalesced deoiling area, a plurality of oil receiving ports for recovering oil are arranged at the upper end of the primary pressure swash plate deoiling tank, a plurality of drain outlets for draining suspended matters are arranged at the lower end of the primary pressure swash plate deoiling tank, and two drain outlets for draining supernatant water can be arranged at the side walls of the primary pressure swash plate.
6. The oilfield produced water treatment system according to claim 5, wherein the secondary pressure swash plate degreasing sled comprises two secondary pressure swash plate degreasing tanks arranged in parallel, the inner cavity of each secondary pressure swash plate degreasing tank is divided into a secondary cyclone separation area, a secondary natural sedimentation area and a secondary swash plate coalescence degreasing area, the secondary cyclone separation area is arranged close to a treated water inlet of each secondary pressure swash plate degreasing tank, a secondary cyclone separator communicated with the treated water inlet of each secondary pressure swash plate degreasing tank is arranged in each secondary cyclone separation area, the secondary natural sedimentation area is positioned at the bottom of each secondary pressure swash plate degreasing tank, the secondary swash plate coalescence degreasing area is internally provided with a secondary pressure swash plate, the upper end of each secondary pressure swash plate degreasing tank is provided with a plurality of oil collecting ports for recycling oil, the lower end of each secondary pressure swash plate degreasing tank is provided with a plurality of drain ports for discharging sedimentation suspended matters, the secondary pressure degreasing tank is respectively provided with a supernatant fluid inlet and a treated water outlet on two opposite side walls, and the secondary pressure degreasing tank can also be used for flushing sand at the drain ports.
7. The oilfield produced water treatment system of claim 6, wherein the inner diameter of the primary cyclone separator is smaller than the inner diameter of the secondary cyclone separator, the flow direction of the supernatant fluid in the primary cyclone separator is from top to bottom, the supernatant fluid passes through the primary pressure sloping plate from bottom to top, the flow direction of the treated water in the secondary cyclone separator is from bottom to top, and the treated water passes through the secondary pressure sloping plate from top to bottom.
8. The oilfield produced water treatment system according to claim 1, wherein the filtration module comprises a plurality of multi-medium filters which are arranged in parallel, the multi-medium filters comprise a filtration tank, a water distributor, a water inlet pipe, a filter material layer, a water outlet pipe and a screen pipe, wherein the water distributor, the water inlet pipe, the filter material layer, the water outlet pipe and the screen pipe are arranged in the filtration tank, one end of the water inlet pipe is communicated with the pressure inclined plate degreasing module, the other end of the water inlet pipe is connected with the water distributor, the water distributor is arranged at the top in the filtration tank, the filter material layer is arranged below the water distributor, the screen pipe is arranged below the filter material layer, the screen pipe is communicated with one end of the water outlet pipe, the other end of the water outlet pipe can be communicated with the outside, the upper end of the filtration tank is further provided with an oil collecting port for oil recovery, the filter material layer comprises an upper anthracite layer, a middle layer of a diamond filter material layer and a lower layer of a pebble cushion layer, and the multi-medium filters can also perform back flushing.
9. The oilfield produced water treatment system according to claim 1, wherein the dirty oil recovery module comprises a dirty oil recovery tank and two horizontal centrifugal pumps, an oil outlet and an oil return port are arranged on the dirty oil recovery tank, one horizontal centrifugal pump is arranged at each of the oil outlet and the oil return port, and a sacrificial anode block is further arranged in the dirty oil recovery tank.
10. An oilfield produced water treatment process, characterized in that the oilfield produced water treatment system according to any one of claims 1 to 9 is used, and comprises the following steps:
The method comprises the steps of feeding oil field produced water into a sludge concentration module for sludge concentration, floating the concentrated oil to the top of the sludge concentration module for oil recovery, settling the sludge in the oil field produced water to the bottom of the sludge concentration module, feeding supernatant obtained in the sludge concentration module into a pressure inclined plate deoiling module, deoiling and removing suspended matters in the pressure inclined plate deoiling module to obtain treated water, feeding the treated water obtained in the pressure inclined plate deoiling module into a filtering module for filtering to further deoiling and removing suspended matters, so that the treated water meets the water quality requirement of oilfield reinjection water, and recovering dirty oil and sewage by using a dirty oil recovery module and temporarily storing the dirty oil and sewage in the process of treating the oil field produced water so as to provide a continuous and stable water source for a rear-end conveying or recycling system.
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| CN202511399755.8A CN120923095A (en) | 2025-09-28 | 2025-09-28 | Oilfield produced water treatment system and treatment process |
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| CN101112665A (en) * | 2007-08-24 | 2008-01-30 | 中国石油大学(华东) | A cyclone-assisted chemical treatment method for oilfield sewage |
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| CN101982425A (en) * | 2010-11-08 | 2011-03-02 | 新疆石油勘察研究设计院（有限公司） | In-tank filtering backwashing water recycle device |
| CN214141826U (en) * | 2020-12-22 | 2021-09-07 | 北京水木益华环保科技有限公司 | A kind of initial rainwater advanced treatment system |
| CN117800510A (en) * | 2022-09-22 | 2024-04-02 | 中国石油天然气股份有限公司 | A thin oil produced water reinjection treatment process |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101112665A (en) * | 2007-08-24 | 2008-01-30 | 中国石油大学(华东) | A cyclone-assisted chemical treatment method for oilfield sewage |
| CN101781040A (en) * | 2010-03-12 | 2010-07-21 | 余金海 | Treatment device of oily sewage of oil field |
| CN101982425A (en) * | 2010-11-08 | 2011-03-02 | 新疆石油勘察研究设计院（有限公司） | In-tank filtering backwashing water recycle device |
| CN214141826U (en) * | 2020-12-22 | 2021-09-07 | 北京水木益华环保科技有限公司 | A kind of initial rainwater advanced treatment system |
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