CN114159838A - Oil-water separation and fine treatment device and oil-water separation and fine treatment method - Google Patents
Oil-water separation and fine treatment device and oil-water separation and fine treatment method Download PDFInfo
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- CN114159838A CN114159838A CN202011386221.9A CN202011386221A CN114159838A CN 114159838 A CN114159838 A CN 114159838A CN 202011386221 A CN202011386221 A CN 202011386221A CN 114159838 A CN114159838 A CN 114159838A
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- 230000001681 protective effect Effects 0.000 claims abstract description 30
- 239000003365 glass fiber Substances 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 16
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- 241001330002 Bambuseae Species 0.000 claims abstract description 12
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 12
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- 238000010586 diagram Methods 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
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Abstract
The invention discloses an oil-water separation fine treatment device and an oil-water separation fine treatment method.A filter element assembly is arranged in a shell of the device and comprises a plurality of filter elements, a bracket and a water distributor; the filter core includes a filter core section of thick bamboo, and the lid is detained the upper cover at filter core section of thick bamboo top to and the lid is detained the lower closing cap in filter core bobbin base portion, and a filter core section of thick bamboo includes by outer to interior in proper order: the protective net comprises a protective net outer cylinder, a filling layer and an inner cylinder; the filling layer is formed by winding hydrophilic oleophobic glass fiber filter filaments along the outer wall of the inner cylinder; a plurality of water through holes are formed in the inner cylinder; a liquid inlet is arranged on the lower sealing cover; the filter element is fixed on the bracket, and the liquid inlet of the filter element is communicated with the outlet of the water distributor. The device is specially used for treating oil-in-water emulsion with the particle size less than 20 mu m, is suitable for a fine treatment process after oil-water separation pretreatment, can ensure that the filter element is not easily polluted, has long service life, and can realize demulsification of emulsified oil in water and separation of micro dispersed oil drops.
Description
Technical Field
The invention relates to the technical field of oil field output liquid treatment, in particular to an oil-water separation and fine treatment device and an oil-water separation and fine treatment method.
Background
Offshore oil field exploitation has become an important measure for ensuring the stability of crude oil in China and reducing the dependence of petroleum import. However, offshore fields continue to increase in water content as the age of waterflooding increases. The daily oil field output liquid volume of the drilling platform reaches thousands of squares or even tens of thousands of squares, and serious negative effects are brought to economy and environment. At present, 70 percent of offshore oil fields in China enter a high water content stage, and oil field output liquid is generated daily to 10000m3And d, the stable yield of the extract is urgently needed by an oil-water separation technology.
The existing treatment process of the output liquid of the drilling platform oil field consists of an inclined plate oil separator, a compact type rotational flow air flotation, a pre-filtering water tank and a walnut shell filter, is a typical traditional three-stage water flow, and has the problems of high manufacturing cost, large occupied area, limited treatment capacity, high process maintenance cost, low treatment efficiency, high material cost, short service life, easy blockage of membrane holes, incapability of removing emulsified oil and the like.
At present, a more optimized oil-water separation treatment device is urgently needed in the market to solve the problem that the offshore oil field enters a high water content stage and the produced liquid of the oil field is too high daily.
Disclosure of Invention
The invention aims to provide an oil-water separation and fine treatment device and an oil-water separation and fine treatment method, wherein the oil-water separation and fine treatment device and the oil-water separation and fine treatment method are specially used for treating oil-in-water emulsions with the particle size smaller than 20 micrometers, are suitable for a fine treatment process after oil-water separation pretreatment, can ensure that a filter element is not easy to pollute, have long service life, and can realize demulsification of emulsified oil in water and separation of micro dispersed oil drops.
The specific technical scheme is as follows:
the invention provides an oil-water separation filter element for fine treatment, which comprises a filter element cylinder, an upper sealing cover and a lower sealing cover, wherein the upper sealing cover is covered and buckled at the top of the filter element cylinder, the lower sealing cover is covered and buckled at the bottom of the filter element cylinder, and the filter element cylinder sequentially comprises the following components from outside to inside: the protective net comprises a protective net outer cylinder, a filling layer and an inner cylinder; the filling layer is formed by winding hydrophilic oleophobic glass fiber filter filaments along the outer wall of the inner cylinder; a plurality of water through holes are formed in the inner cylinder; the lower sealing cover is provided with a liquid inlet.
According to the invention, the filling layer uses the hydrophilic oleophobic glass fiber filter wire to carry out demulsification treatment on the oily wastewater subjected to oil-water separation pretreatment so as to further remove emulsified oil in the produced liquid of the oilfield, wherein the emulsified oil mainly comprises an oil-in-water emulsion and has a diameter smaller than 20 microns; when the emulsified oil passes through the hydrophilic oleophobic glass fiber filter wire wound on the outer wall of the inner barrel, the emulsified oil is demulsified, so that the emulsified oil gradually grows after the oil and water are separated and oil drops are gathered, the emulsified oil becomes large oil drops and naturally floats upwards, and the oil and water separation is realized.
The radius difference between the outer cylinder and the inner cylinder of the protective net, namely the radial thickness of a bed layer, can influence the contact time between liquid in the filter element cylinder and the glass fiber filter wires, thereby influencing the demulsification effect; preferably, the radius difference between the outer cylinder and the inner cylinder of the protective net is 15-35 mm; more preferably, the radius difference between the outer cylinder and the inner cylinder of the protective net is 20-30 mm.
Preferably, the winding density of the filling layer is 0.8-1.0 g/cm3(ii) a More preferably, the packing layer has a winding density of 0.95g/cm3
Preferably, the monofilament diameter of the hydrophilic and oleophobic glass fiber filter is 8-15 μm.
Preferably, the thickness of the outer cylinder of the protective net is 2-5 mm, and the aperture is 1-2 cm.
Further, a liquid inlet pipe extends outwards from the bottom of the lower sealing cover; preferably, the pipe body of the liquid inlet pipe is provided with threads and a sealing ring.
Furthermore, a backflow port is formed in the upper sealing cover, and a backflow pipe extends outwards from the top of the upper sealing cover; preferably, the pipe body of the return pipe is provided with threads and is provided with a sealing ring.
The invention also protects an oil-water separation component which comprises a plurality of oil-water separation filter cores for fine treatment.
The invention also protects an oil-water separation and fine treatment device which comprises a shell and a plurality of oil-water separation filter cores which are arranged in the shell and used for fine treatment.
The invention also provides an oil-water separation fine treatment device which comprises a shell and the oil-water separation assembly arranged in the shell.
Furthermore, the invention also provides a more specific filter core component for oil-water separation and fine treatment, which comprises a plurality of filter cores, a bracket and a water distributor;
the filter core includes a filter core section of thick bamboo, and the lid is buckled at the last closing cap at filter core section of thick bamboo top to and the lid is buckled at the lower closing cap of filter core bobbin base portion, a filter core section of thick bamboo is by outer to interior include in proper order: the protective net comprises a protective net outer cylinder, a filling layer and an inner cylinder; the filling layer is formed by winding hydrophilic oleophobic glass fiber filter filaments along the outer wall of the inner cylinder; a plurality of water through holes are formed in the inner cylinder; a liquid inlet is arranged on the lower sealing cover; the filter element is fixed on the bracket, and the liquid inlet of the filter element is communicated with the outlet of the water distributor.
On the basis of the specific structure of the filter element assembly, the support is provided with a plurality of joints for fixing the filter element, and two ends of each joint are respectively communicated with the liquid inlet of the filter element and the outlet of the water distributor.
Furthermore, a section of liquid inlet pipe extends outwards from the bottom of the lower sealing cover, and the liquid inlet pipe is inserted into the joint, so that the filter element is fixed on the support; the water distributor is positioned below the bracket and is provided with a plurality of water distribution branch pipes and a main water distribution pipe communicated with each branch pipe; each water distribution branch pipe is respectively communicated with the corresponding joint.
Further, the support is disc-shaped, and the joints are arranged annularly; one end of the joint is connected with the liquid inlet pipe of the filter element, and the other end is connected with the water distribution branch pipe of the water distributor.
Further, the oil-water separation fine treatment filter element component also comprises a water collector; the upper sealing cover is provided with a backflow port, and the top of the upper sealing cover extends outwards to form a backflow pipe; the water collector is provided with a plurality of water collecting branch pipes and a main water collecting pipe communicated with each branch pipe, and each water collecting branch pipe is respectively connected with the corresponding return pipe.
Based on the specific structure of the filter element component, the internal structure and material parameters of the filter element are further defined, namely: the radius difference between the outer cylinder and the inner cylinder of the protective net is 15-35 mm; more preferably, the radius difference between the outer cylinder and the inner cylinder of the protective net is 20-30 mm.
Further, the winding density of the filling layer is 0.8-1.0 g/cm3(ii) a The monofilament diameter of the hydrophilic and oleophobic glass fiber filter wire is 8-15 microns.
Based on the specific structure of the filter element assembly, the invention also provides an oil-water separation and fine treatment device, which comprises a shell, wherein the oil-water separation and fine treatment filter element assembly is arranged in the shell, and the oil-water separation and fine treatment filter element assembly is fixed on the inner wall of the shell through a support; the lower part of the shell is provided with a water outlet and a liquid inlet communicated with the water distributor inlet, and the top of the shell is provided with an oil discharge port.
Further, the upper portion of casing is equipped with the backward flow export, the backward flow export communicates with the total header pipe of water collector.
Furthermore, a liquid level meter and a thermometer are installed on the upper portion of the shell, and a pressure gauge is installed on the top of the shell; the bottom of the shell is provided with a discharge pipe, and the middle part of the shell is provided with a hand hole.
Furthermore, the invention also provides another more specific oil-water separation fine treatment device, which comprises a shell, wherein a filter element assembly is arranged in the shell, and the filter element assembly comprises a plurality of filter elements, a bracket and a water distributor; the filter core includes a filter core section of thick bamboo, and the lid is buckled at the last closing cap at filter core section of thick bamboo top to and the lid is buckled at the lower closing cap of filter core bobbin base portion, a filter core section of thick bamboo is by outer to interior include in proper order: the protective net comprises a protective net outer cylinder, a filling layer and an inner cylinder; the filling layer is formed by winding hydrophilic oleophobic glass fiber filter filaments along the outer wall of the inner cylinder; a plurality of water through holes are formed in the inner cylinder; a liquid inlet is arranged on the lower sealing cover; the filter element is fixed on the bracket, and the liquid inlet of the filter element is communicated with the outlet of the water distributor; the lower part of the shell is provided with a water outlet and a liquid inlet communicated with the water distributor inlet, and the top of the shell is provided with an oil discharge port and an exhaust port.
Based on the specific structure of the device, further, the filter element component also comprises a water collector; the upper sealing cover is provided with a backflow port, and the top of the upper sealing cover extends outwards to form a backflow pipe; the water collector is provided with a plurality of water collecting branch pipes and a main water collecting pipe communicated with each branch pipe, and each water collecting branch pipe is respectively connected with the corresponding return pipe; and a backflow outlet is arranged at the upper part of the shell and is communicated with the outlet of a main water collecting pipe of the water collector.
Furthermore, a liquid level meter and a thermometer are installed on the upper portion of the shell, and a pressure gauge is installed on the top of the shell.
Furthermore, a discharge pipe is arranged at the bottom of the shell, and a hand hole is formed in the middle of the shell.
Furthermore, the bracket is provided with a plurality of joints for fixing the filter element, and two ends of each joint are respectively communicated with the liquid inlet of the filter element and the outlet of the water distributor.
Furthermore, a section of liquid inlet pipe extends outwards from the bottom of the lower sealing cover, and the liquid inlet pipe is inserted into the joint, so that the filter element is fixed on the support; the water distributor is positioned below the bracket and is provided with a plurality of water distribution branch pipes and a main water distribution pipe communicated with each branch pipe; each water distribution branch pipe is respectively communicated with the corresponding joint.
Further, the support is disc-shaped, and the joints are arranged annularly; one end of the joint is connected with the liquid inlet pipe of the filter element, and the other end is connected with the water distribution branch pipe of the water distributor.
Further, the radius difference between the outer cylinder and the inner cylinder of the protective net is 15-35 mm; more preferably, the radius difference between the outer cylinder and the inner cylinder of the protective net is 20-30 mm.
Further, the winding density of the filling layer is 0.8-1.0 g/cm3(ii) a The hydrophilic oleophobic glassThe monofilament diameter of the fiber filter wire is 8-15 mu m.
The application also provides a fine treatment method of the oil field produced fluid, which comprises the following steps: and introducing the pretreated oil field produced liquid into the oil-water separation fine treatment device from the liquid inlet, controlling the incoming liquid pressure and the liquid treatment capacity, performing fine treatment on the oil field produced liquid, obtaining pretreated effluent from the liquid outlet, and collecting oil drops from the oil discharge port.
The liquid treatment capacity is too large, namely the oily wastewater passing through the liquid in unit time is too large, the retention time of a single emulsion in the device in contact with the fiber filter wires in the filter element is too short, and the separation efficiency is reduced; there is a need to control the incoming fluid pressure and fluid throughput to ensure that the device can operate at maximum oil removal efficiency and have a longer service life. In addition, the oil discharge frequency affects the oil removal efficiency, so the preferable pressure of the incoming liquid is 0.1-0.44 MPa, and the liquid treatment capacity is 1.1-3.2 m3H; the frequency of oil discharge is 0.5-1 min/20-120 min.
Compared with the prior art, the invention has the following beneficial effects:
(1) the filter core is used for oil-water separation in an inward-outward mode, is specially used for treating oil-in-water emulsion with the particle size of less than 20 mu m, is suitable for a fine treatment process after oil-water separation pretreatment, can ensure that the filter core is not easy to be polluted, has long service life, and can also realize demulsification of emulsified oil in water and separation of micro dispersed oil drops; in addition, use the smart processing apparatus of oil-water separation that this filter core obtained as core assembly, except having the advantage that this filter core brought, can also enrich and retrieve oil and drip, the rate of recovery is high.
(2) The invention does not use the traditional membrane separation principle, namely the aperture physical interception principle, but uses the demulsification dredging principle to effectively remove small-particle emulsified oil which is difficult to remove from the oil field output liquid, so that the oil field output liquid is effectively subjected to fine treatment of oil-water separation after being subjected to oil-water separation pretreatment, and meanwhile, the filter element is ensured not to be easily polluted, and the service life is prolonged.
Drawings
FIG. 1 is an external structure diagram of a filter element for oil-water separation and fine treatment.
Fig. 2 is a schematic cross-sectional view taken along line a-a in fig. 1.
Fig. 3 is a schematic cross-sectional view at B-B in fig. 2.
FIG. 4 is an external structural diagram of a part of an inner cylinder structure in the filter element for oil-water separation and fine treatment.
FIG. 5 is a schematic perspective view of the oil-water separation assembly.
FIG. 6 is a schematic bottom view of the oil-water separation assembly.
FIG. 7 is a schematic diagram of the oil-water separation and fine treatment apparatus in a front view.
FIG. 8 is a left side view schematically showing the structure of the oil-water separating and refining apparatus.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
EXAMPLE 1 Filter element for oil-water separation polishing
The invention provides a filter element for oil-water separation and fine treatment, which comprises a filter element cylinder 101, an upper sealing cover 102 and a lower sealing cover 103 as shown in figure 1. The upper sealing cover 102 is covered and buckled on the top of the filter element cylinder 101, the lower sealing cover 103 is covered and buckled on the bottom of the filter element cylinder 101, the upper sealing cover 102 is provided with a backflow port 104, and the lower sealing cover 103 is provided with a liquid inlet 108. A section of return pipe 106 extends outwards from the top of the upper sealing cover 102, a section of liquid inlet pipe 109 extends outwards from the bottom of the lower sealing cover 103, and O-shaped rubber sealing rings 107 are sleeved on pipe bodies of the return pipe 106 and the liquid inlet pipe 109 so as to be conveniently connected with other parts; the pipe walls of the return pipe 106 and the liquid inlet pipe 109 can also be provided with threads to enhance the stability of the connection.
As shown in fig. 2, the filter element cylinder 101 is composed of a protective net outer cylinder 201, a filling layer 202 and an inner cylinder 203 in sequence from outside to inside. The packing layer 202 is formed by winding hydrophilic and oleophobic fiberglass filter filaments along the outer wall of the inner cylinder 203, as shown in fig. 3. Winding density of hydrophilic and oleophobic glass fiber filter filaments in filling layer 202Is 0.95g/cm3The monofilament diameter of the hydrophilic and oleophobic glass fiber filter was 10 μm. The protective net of the protective net outer cylinder 201 is made of stainless steel, meshes are rhombic, the thickness is 2-5 mm, and the aperture of each mesh is 1-2 cm. In the invention, the hydrophilic oleophobic glass fiber filter can be directly purchased from the market, and can also be obtained by carrying out hydrophilic oleophobic treatment on the glass fiber filter by the conventional technical means. In addition, as shown in FIG. 4, the inner cylinder 203 is provided with a plurality of water holes 401 for allowing liquid to flow in and flow out from the return opening 104.
Example 2 oil-water separation Fine treatment Filter element Assembly (i.e., oil-water separation Assembly)
The invention also provides an oil-water separation fine treatment filter element assembly, as shown in fig. 5, the oil-water separation fine treatment filter element assembly comprises 9 oil-water separation filter elements 501, a bracket 502, a water distributor 503 and a water collector 507; wherein, 9 filter cores are circular arrangement, are equipped with 9 first joints 504 that supply oil separation filter core was inserted and is fixed on the support 502. As shown in fig. 5 and 6, the water distributor 503 is located below the bracket 502, and is provided with 9 water distribution branch pipes 505 and a total water distribution pipe 506 communicated with each branch pipe; each water distribution branch pipe is respectively communicated with the corresponding liquid inlet pipe 109 of the filter element 501, and further communicated with the liquid inlet 108. The bracket 502 is disc-shaped, the first joints are arranged in a ring shape, internal threads are arranged inside the first joints 504, the liquid inlet pipe 109 is inserted into the first joints 504, and the filter element 501 is fixed on the bracket 502 through a threaded connection mode. One end of the first joint 504 is communicated with the liquid inlet pipe 109, and the other end is communicated with the water distribution branch pipe 505. The water collector 507 is positioned above the filter element and is provided with 9 water collecting branch pipes 509 and a main water collecting branch pipe 508 communicated with each branch pipe; each water collecting branch pipe is respectively communicated with the return pipe 106 of the corresponding filter element 501, and further communicated with the return port 104. A second connection 511 is provided at the connection of the branch water collecting pipe 509 and the return pipe 106 for connecting the branch water collecting pipe 508 and the return pipe 106.
As shown in fig. 1, the cartridge includes a cartridge body 101, an upper closure 102, and a lower closure 103. The upper sealing cover 102 is covered and buckled on the top of the filter element cylinder 101, the lower sealing cover 103 is covered and buckled on the bottom of the filter element cylinder 101, the upper sealing cover 102 is provided with a backflow port 104, and the lower sealing cover 103 is provided with a liquid inlet 108. A section of return pipe 106 extends outwards from the top of the upper sealing cover 102, a section of liquid inlet pipe 109 extends outwards from the bottom of the lower sealing cover 103, and O-shaped rubber sealing rings 107 are sleeved on pipe bodies of the return pipe 106 and the liquid inlet pipe 109 so as to be conveniently connected with other parts; the pipe walls of the return pipe 106 and the liquid inlet pipe 109 can also be provided with threads to enhance the stability of the connection.
As shown in fig. 2, the filter element cylinder 101 is composed of a protective net outer cylinder 201, a filling layer 202 and an inner cylinder 203 in sequence from outside to inside. The packing layer 202 is formed by winding hydrophilic and oleophobic fiberglass filter filaments along the outer wall of the inner cylinder 203, as shown in fig. 3. The winding density of the hydrophilic oleophobic glass fiber filter wire in the filling layer 202 is 0.95g/cm3The monofilament diameter of the hydrophilic and oleophobic glass fiber filter was 10 μm. The protective net of the protective net outer cylinder 201 is made of stainless steel, meshes are rhombic, the thickness is 2-5 mm, and the aperture of each mesh is 1-2 cm. In the invention, the hydrophilic oleophobic glass fiber filter can be directly purchased from the market, and can also be obtained by carrying out hydrophilic oleophobic treatment on the glass fiber filter by the conventional technical means. In addition, as shown in FIG. 4, the inner cylinder 203 is provided with a plurality of water holes 401 for allowing liquid to flow in and flow out from the return opening 104.
EXAMPLE 3 oil-water separation and refining apparatus
The invention also provides an oil-water separation pretreatment device, as shown in fig. 7, the oil-water separation pretreatment device comprises a shell 601 (i.e. a kettle body), the top of the shell 601 is provided with an oil discharge port 602 and an exhaust port 603, and a pressure gauge 604 is installed. The upper part of the shell is provided with a return opening 606, the return opening 606 is communicated with the outlet of the water collector 507, and the upper part of the shell is also provided with a liquid level meter 607 and a thermometer 609; the lower part of the shell is provided with a water outlet 612 and a liquid inlet 605, the liquid inlet 605 is communicated with the inlet of the water distributor 503, two sides of the lower part of the shell are respectively provided with a hand hole 608, and the bottom of the shell is provided with a discharge pipe 610 for discharging slag; the oil discharge port 602 is used for discharging oil after oil-water separation; the backflow port 606 is used for backflow of liquid which is not completely and effectively separated in the inner barrel 204 to the oil-water separation pretreatment equipment.
The housing 601 is internally provided with an oil-water separation and fine treatment filter element assembly 611, and the oil-water separation and fine treatment filter element assembly 611 is fixed on the inner wall of the housing 601 through a bracket 502.
The oil-water separation fine treatment filter element assembly comprises 9 oil-water separation filter elements 501, a bracket 502, a water distributor 503 and a water collector 507; wherein, 9 filter cores are circular arrangement, are equipped with 9 first joints 504 that supply oil separation filter core was inserted and is fixed on the support 502. As shown in fig. 5 and 6, the water distributor 503 is located below the bracket 502, and is provided with 9 water distribution branch pipes 505 and a total water distribution pipe 506 communicated with each branch pipe; each water distribution branch pipe is respectively communicated with the corresponding liquid inlet pipe 109 of the filter element 501, and further communicated with the liquid inlet 108. The bracket 502 is disc-shaped, the first joints are arranged in a ring shape, internal threads are arranged inside the first joints 504, the liquid inlet pipe 109 is inserted into the first joints 504, and the filter element 501 is fixed on the bracket 502 through a threaded connection mode. One end of the first joint 504 is communicated with the liquid inlet pipe 109, and the other end is communicated with the water distribution branch pipe 505. The water collector 507 is positioned above the filter element and is provided with 9 water collecting branch pipes 509 and a main water collecting branch pipe 508 communicated with each branch pipe; each water collecting branch pipe is respectively communicated with the return pipe 106 of the corresponding filter element 501, and further communicated with the return port 104. A second connection 511 is provided at the connection of the branch water collecting pipe 509 and the return pipe 106 for connecting the branch water collecting pipe 508 and the return pipe 106.
As shown in fig. 1, the cartridge includes a cartridge body 101, an upper closure 102, and a lower closure 103. The upper sealing cover 102 is covered and buckled on the top of the filter element cylinder 101, the lower sealing cover 103 is covered and buckled on the bottom of the filter element cylinder 101, the upper sealing cover 102 is provided with a backflow port 104, and the lower sealing cover 103 is provided with a liquid inlet 108. A section of return pipe 106 extends outwards from the top of the upper sealing cover 102, a section of liquid inlet pipe 109 extends outwards from the bottom of the lower sealing cover 103, and O-shaped rubber sealing rings 107 are sleeved on pipe bodies of the return pipe 106 and the liquid inlet pipe 109 so as to be conveniently connected with other parts; the pipe walls of the return pipe 106 and the liquid inlet pipe 109 can also be provided with threads to enhance the stability of the connection.
As shown in fig. 2, the filter element cylinder 101 is composed of a protective net outer cylinder 201, a filling layer 202 and an inner cylinder 203 in sequence from outside to inside. The packing layer 202 is formed by winding hydrophilic and oleophobic fiberglass filter filaments along the outer wall of the inner cylinder 203, as shown in fig. 3. The hydrophilic and oleophobic glass fiber filter wire in the filling layer 202 has a winding density of 0.95gcm3The monofilament diameter of the hydrophilic and oleophobic glass fiber filter was 10 μm. The protective net of the protective net outer cylinder 201 is made of stainless steel, meshes are rhombic, the thickness is 2-5 mm, and the aperture of each mesh is 1-2 cm. In the invention, the hydrophilic oleophobic glass fiber filter can be directly purchased from the market, and can also be obtained by carrying out hydrophilic oleophobic treatment on the glass fiber filter by the conventional technical means. In addition, as shown in FIG. 4, the inner cylinder 203 is provided with a plurality of water holes 401 for allowing liquid to flow in and flow out from the return opening 104.
The operation flow of the oil-water separation fine treatment device when treating the output liquid of the oil field is as follows: the pretreated oil field produced fluid (mainly emulsion with the diameter less than 20 microns in the oil field produced fluid) enters a filter element inside a shell of an oil-water separation fine treatment device through a fluid inlet and a water distributor, the oil field produced fluid sequentially passes through an inner cylinder of the filter element, a filling layer and a protective net from inside to outside, under the demulsification action of the filling layer, the emulsion in the oil field produced fluid is separated into water and oil, flows out of an inner cavity of the shell of the oil-water separation fine treatment device through the outer cylinder of the protective net and is influenced by density, the oil separated in the emulsion floats on the water surface, the oil floating on the water surface rises to an oil discharge port along with the increase of the flowing liquid, and clean water under the oil flows out of the shell through a water outlet, so that the purpose of oil-water separation is finally achieved. Detecting the effluent, and if the oil content in the effluent is lower than 30ppm, continuously performing the process; and if the oil content in the effluent is higher than 30ppm, starting the water collector, and enabling the oil field output liquid flowing into the inner barrel to flow back to the upper-stage oil-water separation pretreatment equipment for treatment through the water collector and the backflow port according to a certain proportion.
Application example 1
The filter element and the oil-water separation fine treatment device are applied to the oil-water separation treatment of the oil field output liquid, and the specific content is as follows:
jinxian 1-1 oil field oil-bearing stratum in Dongying group and Shahejie street group of ancient system, crude oil density: 0.93 to 0.99g/cm3The comprehensive water content reaches 63.6 percent, and the oil field production enters the middle and later stages of water containing. The original platform production sewage treatment system of the oil field mainly receives the sewage fromProduction water produced by the primary production separator, the secondary production separator and the electric dehydrator.
The application example takes the effluent liquid after oil-water separation pretreatment as the oil field output liquid to be treated, and the oil content is emulsified oil with the oil content of 0-100 mg/l; introducing the oil field produced liquid into an oil-water separation fine treatment device for oil-water separation treatment, and controlling the incoming liquid pressure and liquid treatment capacity of the oil-water separation fine treatment device and the oil discharge frequency; the oil content of the inlet water and the oil content of the outlet water of the oil-water separation and fine treatment device at different time points and the oil content of the collected oil are monitored, and the results are shown in the following table.
TABLE 1 oil-water separation and fine treatment device for different time points
The oil-water separation pretreatment device can ensure that the oil content of the effluent reaches the standard (the oil content of the effluent is less than or equal to 30mg/l) under the conditions of higher incoming liquid pressure, higher treatment capacity and pressure difference, and the effluent of the oil-water separation pretreatment device is good in color and low in suspended matter content and can directly reach most of water injection quality standards of an oilfield field, and after the oil-water separation pretreatment device operates for 1 month, a filter element is not obviously polluted and still keeps a stable operation state.
Claims (10)
1. An oil-water separation fine treatment device comprises a shell, and is characterized in that a filter element assembly is arranged in the shell and comprises a plurality of filter elements, a bracket and a water distributor; the filter core includes a filter core section of thick bamboo, and the lid is buckled at the last closing cap at filter core section of thick bamboo top to and the lid is buckled at the lower closing cap of filter core bobbin base portion, a filter core section of thick bamboo is by outer to interior include in proper order: the protective net comprises a protective net outer cylinder, a filling layer and an inner cylinder; the filling layer is formed by winding hydrophilic oleophobic glass fiber filter filaments along the outer wall of the inner cylinder; a plurality of water through holes are formed in the inner cylinder; a liquid inlet is arranged on the lower sealing cover; the filter element is fixed on the bracket, and the liquid inlet of the filter element is communicated with the outlet of the water distributor; the lower part of the shell is provided with a water outlet and a liquid inlet communicated with the water distributor inlet, and the top of the shell is provided with an oil discharge port and an exhaust port.
2. The oil-water separation polishing apparatus according to claim 1, wherein the filter element assembly further comprises a water collector; the upper sealing cover is provided with a backflow port, and the top of the upper sealing cover extends outwards to form a backflow pipe; the water collector is provided with a plurality of water collecting branch pipes and a main water collecting pipe communicated with each branch pipe, and each water collecting branch pipe is respectively connected with the corresponding return pipe; and a backflow outlet is arranged at the upper part of the shell and is communicated with the outlet of a main water collecting pipe of the water collector.
3. The oil-water separation fine processing device according to claim 1, wherein a liquid level meter and a thermometer are installed on the upper part of the shell, and a pressure gauge is installed on the top of the shell; the bottom of the shell is provided with a discharge pipe, and the middle part of the shell is provided with a hand hole.
4. The oil-water separating and fine processing device according to claim 1, wherein the bracket is provided with a plurality of joints for fixing the filter element, and two ends of the joints are respectively communicated with the liquid inlet of the filter element and the outlet of the water distributor.
5. The oil-water separation fine processing device according to claim 4, wherein a liquid inlet pipe extends outwards from the bottom of the lower sealing cover, and the liquid inlet pipe is inserted into the joint, so that the filter element is fixed on the bracket; the water distributor is positioned below the bracket and is provided with a plurality of water distribution branch pipes and a main water distribution pipe communicated with each branch pipe; each water distribution branch pipe is respectively communicated with the corresponding joint.
6. The apparatus according to claim 4, wherein the frame is in the shape of a disk and the joints are arranged in a ring; one end of the joint is connected with the liquid inlet pipe of the filter element, and the other end is connected with the water distribution branch pipe of the water distributor.
7. The oil-water separation and fine treatment device according to claim 1, wherein the radius difference between the outer cylinder and the inner cylinder of the protective net is 15-35 mm.
8. The oil-water separation polishing apparatus according to claim 1, wherein the packing layer has a winding density of 0.8 to 1.0g/cm3 g/cm3(ii) a The monofilament diameter of the hydrophilic and oleophobic glass fiber filter wire is 8-15 microns.
9. The fine treatment method of the oil field produced fluid is characterized by comprising the following steps: introducing the pretreated oil field produced liquid into the oil-water separation fine treatment device according to any one of claims 1 to 8 from a liquid inlet, controlling the incoming liquid pressure and the liquid treatment amount, performing fine treatment on the oil field produced liquid, obtaining pretreated effluent from a liquid outlet, and collecting oil drops from an oil discharge port.
10. The fine treatment method of the oilfield produced fluid according to claim 9, wherein the incoming fluid pressure is 0.1 to 0.44Mpa, and the fluid treatment capacity is 1.1 to 3.2m3H; the frequency of oil discharge is 0.5-1 min/20-120 min.
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