CN210068124U - Pipeline type oil-gas-water separation system - Google Patents
Pipeline type oil-gas-water separation system Download PDFInfo
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- CN210068124U CN210068124U CN201920415502.9U CN201920415502U CN210068124U CN 210068124 U CN210068124 U CN 210068124U CN 201920415502 U CN201920415502 U CN 201920415502U CN 210068124 U CN210068124 U CN 210068124U
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Abstract
The utility model relates to a pipeline formula oil gas-water separation system, include: the upper-layer sleeve structure comprises an upper-layer outer pipe and an upper-layer inner pipe, wherein one end of the upper-layer inner pipe is provided with a gas phase outlet, and the top of the upper-layer inner pipe is provided with a first inlet; the oil phase separator comprises a middle-layer sleeve structure comprising a middle-layer outer pipe and a middle-layer inner pipe, wherein one end of the middle-layer inner pipe is provided with a liquid inlet, the other end of the middle-layer inner pipe is provided with an oil phase outlet, the top of the middle-layer inner pipe is provided with a first outlet, and the bottom of the middle-layer inner pipe is provided; the lower-layer sleeve structure comprises a lower-layer outer pipe and a lower-layer inner pipe, wherein one end of the lower-layer inner pipe is provided with a water phase outlet, and the bottom of the lower-layer inner pipe is provided with a second inlet; the first vertical pipe is communicated with the upper layer outer pipe and the middle layer outer pipe; and the second vertical pipe is communicated with the middle-layer outer pipe and the lower-layer outer pipe. The pipeline type oil-gas-water separation system completely adopts a pipeline type separation technology, realizes complete separation of oil, gas and water through the action of dynamic gravity separation and shallow pool separation, and has the advantages of small occupied area, high treatment efficiency and the like.
Description
Technical Field
The utility model relates to an oil gas water separation technical field, more specifically say, relate to a pipeline formula oil gas water separation system.
Background
In the field of oil and gas exploitation such as petroleum and natural gas, an oil-gas-water multiphase separation system is generally needed to separate the produced fluid of a production well into oil phase, gas phase and water phase which reach the standard. At present, the exploitation amount of land and offshore oil and gas fields is greatly increased, along with the continuation of exploitation, the water content of an oil well is higher and higher, and a large amount of gas is often accompanied, so that greater pressure is brought to the existing oil-gas-water separation system, the defects of the traditional separation technology are gradually revealed, and the development of the offshore oil and gas exploitation technology is influenced.
The physical separation method in the oil-gas-water multiphase separation technology mainly comprises a gravity separation method, a centrifugal separation method, an air flotation separation method, a membrane separation method, a filtration separation method and the like. In the actual production, often need carry out quick separation to a large amount of oil gas water mixed liquid, gravity separation and filtration separation are all effectual separation technique means, but the processing speed is relatively slower, and equipment structure is complicated, bulky. Patent "combined type oil-water separation system" with grant publication number CN101810941B discloses a pipeline type oil-water separation system composed of a ladder type pipe and a rotational flow pipe, which has simple structure, rapid treatment and good effect on the separation of oil phase and water phase. Patent No. CN104707364B entitled oil-water separation device and method discloses a pipeline type oil-water separation device integrating centrifugation and gravity separation, which can realize rapid separation of oil-water mixed liquid. Patent No. CN105031977B entitled oil-gas-water multiphase separation system and application method thereof discloses a pipeline type oil-gas-water separation system and application method thereof, which can realize rapid separation of oil-gas-water mixed liquid, wherein the pipeline type oil-gas-water separation system comprises gas-liquid cyclone separation, oil-water cyclone coalescence and dynamic gravity separation.
In summary, the oil-gas-water separation device in oil-gas exploitation gradually develops towards high efficiency, light weight and the like. Therefore, the development of a novel efficient compact separator improves the indexes and efficiency of oil-gas-water separation, reduces the load of an offshore platform, and has great significance for the development of offshore oil engineering.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a pipeline formula piece-rate system, can realize mixing the high efficiency separation that comes the liquid to oil gas water, have that area is little, separation speed advantage such as fast to can realize mixing the complete automatic control who comes the liquid separation to oil gas water.
The utility model provides a technical scheme that its technical problem adopted is: provided is a pipeline type oil-gas-water separation system, which comprises:
the upper-layer sleeve structure comprises an upper-layer outer pipe and an upper-layer inner pipe which are horizontally arranged; one end of the upper inner pipe is provided with a gas phase outlet, and the top of the upper inner pipe is provided with a first inlet;
the middle-layer sleeve structure comprises a middle-layer outer pipe and a middle-layer inner pipe which are horizontally arranged; one end of the middle-layer inner pipe is provided with a liquid inlet, and the other end of the middle-layer inner pipe is provided with an oil phase outlet; the top of the middle-layer inner pipe is provided with a first outlet, and the bottom of the middle-layer inner pipe is provided with a second outlet;
the lower-layer sleeve structure comprises a lower-layer outer pipe and a lower-layer inner pipe which are horizontally arranged; one end of the lower layer inner pipe is provided with a water phase outlet, and the bottom of the lower layer inner pipe is provided with a second inlet;
the first vertical pipe is used for communicating the upper layer outer pipe and the middle layer outer pipe;
and the second vertical pipe is used for communicating the middle-layer outer pipe and the lower-layer outer pipe.
In some embodiments, the upper outer pipe and the upper inner pipe are eccentrically arranged, and the upper gap between the upper outer pipe and the upper inner pipe is smaller than the lower gap;
the middle-layer outer pipe and the middle-layer inner pipe are coaxially arranged;
the lower outer pipe and the lower inner pipe are eccentrically arranged, and the gap at the upper part between the lower outer pipe and the lower inner pipe is larger than the gap at the lower part.
In some embodiments, the ratio of the upper gap to the lower gap between the upper outer tube and the upper inner tube is 1:3, and the ratio of the upper gap to the lower gap between the lower outer tube and the lower inner tube is 3: 1.
In some embodiments, the bottom of the upper layer outer pipe and the top of the middle layer outer pipe are communicated through a plurality of obliquely arranged first stand pipes, and the bottom of the middle layer outer pipe and the top of the lower layer outer pipe are communicated through a plurality of vertically arranged second stand pipes.
In some embodiments, the first risers have an inclination angle α of 15-45 °, a horizontal spacing of 1-1.8m, and a number of 6-12, and the second risers have a spacing of 1-1.8m, and a number of 6-12.
In some embodiments, the mixed flow of the mixed liquid of oil, gas and water is 20-30m3H, the volume gas content is not higher than 30 percent, and the volume water content in the liquid phase is not higher than 60 percent,
the inner diameter of the upper-layer outer pipe is 100mm, the inner diameter of the upper-layer inner pipe is 50mm, the outer diameter of the upper-layer inner pipe is 60mm, the diameter of a first inlet formed in the top of the upper-layer inner pipe is 6mm, the number of the first inlets is 80, the gap between the upper-layer outer pipe and the upper-layer inner pipe is 10mm, and the gap between the upper-layer outer pipe and the upper-layer inner pipe is 30 mm;
the inner diameter of the middle-layer outer pipe is 100mm, the inner diameter of the middle-layer inner pipe is 50mm, the outer diameter of the middle-layer inner pipe is 60mm, the diameter of first outlets formed in the top of the middle-layer inner pipe is 6mm, the number of the first outlets is 80, and the diameter of second outlets formed in the bottom of the middle-layer inner pipe is 8mm, and the number of the second outlets is 80;
the inner diameter of the lower-layer outer pipe is 100mm, the inner diameter of the lower-layer inner pipe is 50mm, the outer diameter of the lower-layer inner pipe is 60mm, the diameter of each second inlet formed in the bottom of the lower-layer inner pipe is 8mm, the number of the second inlets is 80, the gap between the upper portion of the lower-layer outer pipe and the lower portion of the lower-layer inner pipe is 30mm, and the gap between the lower portion of the lower-layer outer pipe;
the inner diameter of the first vertical pipe is 50mm, the inclination angle α is 30 degrees, the horizontal distance is 1m, and the number of the first vertical pipes is 6;
the inner diameter of the second stand pipe is 50mm, the distance between the stand pipes is 1m, and the number of the stand pipes is 6.
In some embodiments, the first inlet, the first outlet, the second outlet, and the second inlet are each a through hole and/or a slit.
In some embodiments, the pipeline type oil-gas-water separation system further comprises a first regulating valve and a liquid collecting cavity which are sequentially arranged on the gas phase outlet pipeline of the upper inner pipe, a second regulating valve arranged on the oil phase outlet pipeline of the middle inner pipe, a return pipeline communicating the liquid collecting cavity with the outlet of the second regulating valve, a third regulating valve arranged on the water phase outlet pipeline of the lower inner pipe, and a fourth regulating valve arranged on the return pipeline.
In some embodiments, the pipeline type oil-gas-water separation system further comprises a liquid level detector arranged in the liquid collecting cavity, and an oil content analyzer arranged on the water phase outlet pipeline of the lower-layer inner pipe.
In some embodiments, the first, second, third, and fourth regulator valves are all electrically-actuated regulator valves; the liquid level detector is respectively in communication connection with the first regulating valve and the fourth regulating valve and controls the opening of the corresponding valves; and the oil content analyzer is in communication connection with the second regulating valve and the third regulating valve respectively and controls the opening degree of the corresponding valves.
Implement the utility model discloses following beneficial effect has at least: the utility model discloses a pipeline formula oil gas water separation system, through the effect of dynamic gravity separation and shallow pool separation, middle level sleeve pipe structure can realize the initial separation to the oil gas water mixture liquid that comes, and upper casing pipe structure can realize the further meticulous separation to the gas-liquid after the initial separation of middle level sleeve pipe structure, and lower casing pipe structure can realize the further meticulous separation to the profit after the initial separation of middle level sleeve pipe structure; the pipeline type oil-gas-water separation system completely adopts a pipeline type separation technology, realizes complete separation of oil, gas and water, has the characteristics of small occupied area, high treatment efficiency and the like, is suitable for onshore and offshore oil fields, is easy to install and apply underwater, and has better industrial application prospect.
In addition, the separation process can be completely and automatically controlled through the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve, the liquid collecting cavity, the return pipeline, the liquid level detector and the oil content analyzer which are arranged on each outlet pipeline, and the liquid content in the separated gas, the water content in the oil and the oil content in the water are controlled below preset standards.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic diagram of a pipeline oil-gas-water separation system according to some embodiments of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1-2 show the pipeline formula oil gas water separation system in some embodiments of the present invention, this pipeline formula oil gas water separation system includes multilayer fork pipeline separator, and this multilayer fork pipeline separator is used for realizing the high efficiency separation that comes the liquid to the oil gas water mixture, and its one end has can supply the inlet 4 that oil gas water mixture came the liquid inflow, and the other end has the gaseous phase export 15 that can supply the gaseous phase after the separation to flow out, supplies the oil phase export 25 that the oil phase after the separation flows out, and supplies the aqueous phase export 35 that the aqueous phase after the separation flows out. The multilayer bifurcation pipeline separation device comprises an upper-layer sleeve structure 1, a middle-layer sleeve structure 2 and a lower-layer sleeve structure 3 which are horizontally arranged, at least one first vertical pipe 51 used for communicating the upper-layer sleeve structure 1 with the middle-layer sleeve structure 2, and at least one second vertical pipe 52 used for communicating the middle-layer sleeve structure 2 with the lower-layer sleeve structure 3. The multilayer branched pipeline separation device separates oil, gas and water mixed incoming liquid through dynamic gravity separation and shallow pool sedimentation separation theory.
Specifically, the middle casing structure 2 includes a middle outer pipe 21 and a middle inner pipe 22, which are horizontally disposed, and can realize the initial separation of the mixed liquid of oil, gas and water. Wherein, one end of the middle layer inner tube 22 is provided with a liquid inlet 41, and the other end is provided with an oil phase outlet 25. Preferably, the middle outer tube 21 and the middle inner tube 22 are coaxially disposed. The top of the middle layer inner tube 22 is provided with a first outlet 23 for the outflow of the gas phase separated primarily, and the bottom is provided with a second outlet 24 for the outflow of the water phase separated primarily.
The upper casing structure 1 comprises an upper outer pipe 11 and an upper inner pipe 12 which are horizontally arranged, and further fine separation of gas and liquid after primary separation of the middle casing structure 2 can be realized. Wherein, the upper layer inner tube 12 has a gas phase outlet 15 at one end corresponding to the oil phase outlet 25. The end of the upper casing structure 1 corresponding to the liquid inlet 4 may be sealed by a blind plate, or it may be connected to the middle casing structure 2 through a first riser 51. The top of the upper layer inner pipe 12 is opened with a first inlet 13 for the separated gas phase to flow in. Preferably, the upper outer pipe 11 and the upper inner pipe 12 are eccentrically arranged, and the gap at the upper part between the upper outer pipe 11 and the upper inner pipe 12 is smaller than the gap at the lower part, so that the effect of the shallow pool separation theory is enhanced, and the efficiency and index of gas-liquid separation are improved. The eccentric distance between the upper outer pipe 11 and the upper inner pipe 12 can be determined according to the diameter of the inner and outer pipelines, and generally, the ratio of the upper gap to the lower gap between the upper outer pipe 11 and the upper inner pipe 12 is 1: 3.
The lower casing structure 3 includes a lower outer pipe 31 and a lower inner pipe 32 horizontally disposed, and it can realize further fine separation of oil and water after the preliminary separation of the middle casing structure 2. Wherein, one end of the lower layer inner pipe 32 corresponding to the oil phase outlet 25 is provided with a water phase outlet 35. The end of the lower casing structure 3 corresponding to the liquid inlet 4 may be sealed by a blind plate, or it may be connected to the middle casing structure 2 by a second riser 52. The bottom of the lower inner tube 32 is provided with a second inlet 34 into which the separated aqueous phase flows.
Preferably, the lower outer tube 31 and the lower inner tube 32 are eccentrically arranged, and the upper gap between the lower outer tube 31 and the lower inner tube 32 is larger than the lower gap, so as to enhance the effect of the shallow pool separation theory and improve the efficiency and index of oil-water separation. The eccentric distance between the lower outer tube 31 and the lower inner tube 32 can be determined according to the diameters of the inner and outer pipes, and generally, the ratio of the upper gap to the lower gap between the lower outer tube 31 and the lower inner tube 32 is 3: 1.
The first outlet 23, the second outlet 24, the first inlet 13, the second inlet 34 may each be a through hole and/or a slit to prevent backflow. Preferably, the first outlet 23 and the second outlet 24 are a plurality of circular holes respectively arranged at the top and the bottom of the middle layer inner tube 22; the first inlet 13 may be a plurality of circular holes disposed at the top of the upper layer inner tube 12; the second inlet 34 may be a plurality of circular holes disposed at the bottom of the lower inner tube 32. Wherein, the number and diameter of the top openings of the middle inner tube 22 can be the same as the number and diameter of the top openings of the upper inner tube 12; the number and diameter of the bottom openings of the middle inner tube 22 can be the same as the number and diameter of the bottom openings of the lower inner tube 32. The number and diameter of the openings at the top of the middle inner tube 22 and the number and diameter of the openings at the top of the upper inner tube 12 can be calculated according to the gas phase volume percentage of the mixed incoming liquid of oil, gas and water at the liquid inlet. The number and diameter of the bottom openings of the middle inner tube 22 and the number and diameter of the bottom openings of the lower inner tube 32 can be calculated according to the volume percentage of the water phase in the mixed incoming liquid of oil, gas and water at the liquid inlet.
The bottom of the upper-layer outer pipe 11 and the top of the middle-layer outer pipe 21 are preferably communicated through a plurality of first vertical pipes 51 which are arranged in an inclined mode, the vertical pipes are designed in an inclined mode, flowing resistance can be effectively reduced, gas-liquid rapid separation is promoted, a flow field structure can be optimized, and separation stability is improved.
Preferably, the bottom of the middle outer tube 21 and the top of the lower outer tube 31 are communicated with each other through a plurality of second vertical tubes 52 arranged vertically. The spacing and number of the second risers 52 can be calculated from the volume fraction of the water phase in the incoming liquid of the oil-gas-water mixture at the inlet. Generally, the number of the second vertical pipes 52 is 6 to 12, and the distance between the second vertical pipes is 1m to 1.8 m. Typically, when the volumetric water content in the liquid phase at the inlet is not higher than 60%, the number of second stand pipes 52 is 6 with a spacing of 1 m.
In other embodiments, the second riser 52 may also be an inclined riser, and the flow field structure may also be optimized to reduce the flow resistance. However, the effect of providing the second riser 52 as an inclined riser in the oil-water separation is small compared to the effect of providing the first riser 51 as an inclined riser in the gas-liquid separation, and the cost of processing is increased.
The separation process of the multilayer branched pipeline separation device comprises the following steps: oil-gas-water mixed incoming liquid enters the middle-layer inner pipe 22 from a liquid inlet 4 of the multi-layer branched pipeline separation device, and is layered in the flowing process under the action of dynamic gravity separation and shallow pool separation theory, wherein the gas phase at the upper layer flows out from a first outlet 23 formed in the top of the middle-layer inner pipe 22, and the water phase at the lower layer flows out from a second outlet 24 formed in the bottom of the middle-layer inner pipe 22; the gas phase which is primarily separated flows into the upper-layer sleeve structure 1 through the first vertical pipe 51, gas and liquid are further separated under the action of the shallow pool separation theory, the completely separated gas phase enters the upper-layer inner pipe 12 through a first inlet 13 formed in the top of the upper-layer inner pipe 12, and finally flows out through a gas phase outlet 15 of the multi-layer branched pipeline separation device; the water phase which is primarily separated flows into the lower-layer casing structure 3 through the second vertical pipe 52, the oil-water mixed liquid is further finely separated under the action of the shallow pool separation theory, the completely separated water phase enters the lower-layer inner pipe 32 through a second inlet 34 formed in the bottom of the lower-layer inner pipe 32, and finally flows out through a water phase outlet 35 of the multi-layer branched pipeline separation device; the residual oil phase flows out from an oil phase outlet 25 of the multi-layer branched pipeline separation device, so that the complete separation of oil, gas and water is realized.
The sizes of the inner pipeline and the outer pipeline in the multi-layer branched pipeline separation device can be determined according to the mixed flow and the volume fraction of the mixed incoming liquid of oil, gas and water. When oil, gas and water are mixedThe flow rate is 20-30m3Volume gas rate is not higher than 30%, volume moisture content is not higher than 60% oil gas water mixture in the liquid phase and comes the liquid and get into under the operating mode condition the utility model provides a during multilayer bifurcation pipeline separator, concrete embodiment's size is as follows:
in an upper-layer sleeve structure 1 in a multi-layer branched pipeline separation device, the inner diameter of an upper-layer outer pipe 11 is 100mm, the inner diameter of an upper-layer inner pipe 12 is 50mm, the outer diameter of the upper-layer inner pipe is 60mm, the diameter of a first inlet 13 formed in the top of the upper-layer inner pipe 12 is 6mm, the number of the first inlets is 80, the gap between the upper-layer outer pipe 11 and the upper-layer inner pipe 12 is 10mm, and the gap between the lower parts of the upper-layer outer pipe 11 and the;
in the middle-layer sleeve structure 2 in the multi-layer branched pipeline separation device, the inner diameter of a middle-layer outer pipe 21 is 100mm, the inner diameter of a middle-layer inner pipe 22 is 50mm, the outer diameter of the middle-layer inner pipe 22 is 60mm, the diameter of first outlets 23 formed in the top of the middle-layer inner pipe 22 is 6mm, the number of the first outlets is 80, and the diameter of second outlets 24 formed in the bottom of the middle-layer inner pipe is 8mm, and the number of the second outlets is 80;
in the lower-layer sleeve structure 3 in the multi-layer branched pipeline separation device, the inner diameter of a lower-layer outer pipe 31 is 100mm, the inner diameter of a lower-layer inner pipe 32 is 50mm, the outer diameter of the lower-layer inner pipe is 60mm, the diameter of a second inlet 34 formed in the bottom of the lower-layer inner pipe 32 is 8mm, the number of the second inlets is 80, the gap between the upper part of the lower-layer outer pipe 31 and the lower part of the lower-layer inner pipe 32 is 30mm, and the gap;
the inner diameter of the first stand pipe 51 in the multi-layer branched pipeline separation device is 50mm, the inclination angle α is 30 degrees, the horizontal distance is 1m, and the number of the stand pipes is 6;
the second risers 52 in the multi-level branched pipe separation unit have an internal diameter of 50mm and a pitch of 1m, and the number of the risers is 6.
Preferably, the utility model provides a pipeline formula oil gas water separation system still can include the return line 72 that installs the collecting chamber 71 on multilayer fork pipeline separator gas phase outlet pipeline and be linked together collecting chamber 71 and multilayer fork pipeline separator's oil phase outlet pipeline. The liquid collecting cavity 71 can collect liquid carried in the gas phase outlet pipeline and make the carried liquid flow into the oil phase outlet pipeline through the return pipeline 72 so as to further improve the effect of gas separation and reduce the liquid containing rate of the volume in the gas to be within 0.5 percent. In general, the above-mentioned preset value of the liquid content in the gas volume can be also adjusted appropriately.
Further, the pipeline type oil-gas-water separation system can further comprise a first regulating valve 61 installed on the gas phase outlet pipeline of the multilayer branched pipeline separation device, a second regulating valve 62 installed on the oil phase outlet pipeline of the multilayer branched pipeline separation device, a third regulating valve 63 installed on the water phase outlet pipeline of the multilayer branched pipeline separation device, and a fourth regulating valve 64 installed on the return pipeline 72, so that the flow of the corresponding pipeline can be regulated. The first, second, third, and fourth regulating valves 61, 62, 63, and 64 may each be a manual regulating valve or an electric regulating valve. In some embodiments, the first regulating valve 61 and the liquid collecting chamber 71 may be sequentially installed on the gas phase outlet pipeline of the multi-layer branched pipeline separation device. The return line 72 can communicate the liquid collecting cavity 71 with the outlet of the second regulating valve 62 to discharge the liquid phase accumulated in the liquid collecting cavity 71, so that the liquid level control method is prevented from being affected by the fact that the area in the liquid collecting cavity 71 becomes a flowing dead zone.
Preferably, the first regulating valve 61, the second regulating valve 62, the third regulating valve 63 and the fourth regulating valve 64 are all electric regulating valves, so as to realize the full automatic control of oil-gas-water separation.
In addition, the pipeline type oil-gas-water separation system can also comprise a liquid level detector 81 arranged in the liquid collecting cavity 71 and an oil content analyzer 82 arranged on the water phase outlet pipeline of the multi-layer branched pipeline separation device. The liquid level detector 81 can measure the liquid level in the liquid collecting cavity 71 in real time, transmit the measured signals to the first regulating valve 61 and the fourth regulating valve 64, control the opening degree of the corresponding valves, and reduce the liquid containing rate of the gas volume to be below a preset standard (such as 0.5%). The oil content analyzer 82 can measure the oil content of the water phase outlet pipeline in real time, transmit the measured signals to the second regulating valve 62 and the third regulating valve 63, control the opening degree of the corresponding valves, and reduce the oil content to be below a preset standard (such as 30 mg/L).
In some embodiments, the level detector 81 may be a capacitive level gauge and the oil content analyzer 82 may be an infrared oil content on-line analyzer. Of course, all high accuracy on-line measuring instruments can all realize the measured function, but can have certain difference in precision and sensitivity, the utility model discloses only provide a concrete measurement scheme, can select different measuring instrument and measurement scheme according to the measuring requirement in the reality, come to measure one or more parameters in gas liquid-containing rate, water-containing rate in the oil, aquatic oil-containing rate, liquid level etc..
The utility model provides a pipeline formula oil gas water separation system adopts the separation technique of pipeline formula completely, realizes the complete separation of oil gas water, has characteristics such as area is little, treatment effeciency height, and can realize complete automatic control to the process of separation. The utility model discloses a pipeline formula oil gas water separation system all has great advantage in the aspect of handling index, separation efficiency and area etc, can replace the jar body formula piece-rate system who adopts in the oil gas exploitation betterly, and it is applicable in land and offshore oil field, easily installs and is applied to under water, has better industrial application prospect.
Aiming at the pipeline type oil-gas-water separation system, the separation treatment is carried out according to the following steps:
s1, inputting oil, gas and water mixed liquid into a pipeline type oil-gas-water separation system through a liquid inlet 4, performing preliminary separation in the middle-layer sleeve structure 2 under the action of dynamic gravity separation and shallow pool separation, enabling the preliminarily separated gas phase to flow out of a first outlet 23 at the top of a middle-layer inner pipe 22 and flow into the upper-layer sleeve structure 1 through a first vertical pipe 51, performing fine separation under the action of shallow pool separation, and enabling the completely separated gas phase to flow into the upper-layer inner pipe 12 through a first inlet 13 at the top of the upper-layer inner pipe 12 and flow out through a gas phase outlet 15; the water phase which is primarily separated flows out from the second outlet 24 at the bottom of the middle layer inner pipe 22, flows into the lower layer casing pipe structure 3 through the second vertical pipe 52, is finely separated through the shallow pool separation effect, and completely separated water phase enters the lower layer inner pipe 32 from the second inlet 34 at the bottom of the lower layer inner pipe 32 and flows out through the water phase outlet 35; the remaining oil phase flows out through the middle layer inner tube 22 via the oil phase outlet 25.
When the pipe type oil-gas-water separation system is provided with the liquid collecting chamber 71 and the return line 72, correspondingly, after step S1, the method further includes:
s2, when the gas phase separated by the multi-layer branched pipe separation device flows to the liquid collection chamber 71 through the gas phase outlet pipe, the liquid carried in the gas phase is collected by the liquid collection chamber 71, and the carried liquid flows into the oil phase outlet pipe through the return pipe 72 and flows out.
Preferably, the flow rates of the corresponding pipelines can be adjusted through the first adjusting valve 61, the second adjusting valve 62, the third adjusting valve 63 and the fourth adjusting valve 64, so that the liquid content in the separated gas, the water content in the oil and the oil content in the water can reach below preset standards. In a preferred embodiment, the automatic control of the operation of the pipeline type oil-gas-water separation system can be realized by the following steps, which are further included before step S1:
s0, opening a first regulating valve 61 on a gas phase outlet pipeline of the upper inner pipe 12, a second regulating valve 62 on an oil phase outlet pipeline of the middle inner pipe 22 and a third regulating valve 63 on a water phase outlet pipeline of the lower inner pipe 32 to a fully opened position, and opening a fourth regulating valve 64 on a return pipeline 72 to a fully closed position;
step S2 is followed by:
s3, measuring the liquid level in the liquid collecting cavity 71 in real time through a liquid level detector 81 arranged in the liquid collecting cavity 71, and controlling the liquid level within a preset numerical value H1; transmitting the signal measured by the liquid level detector 81 to the first regulating valve 61 and the fourth regulating valve 64, and when the liquid level measured by the liquid level detector 81 is higher than a preset value H1, increasing the fourth regulating valve 64 and decreasing the first regulating valve 61;
s4, measuring the oil content in the water phase outlet pipeline in real time through the oil content analyzer 82 arranged on the water phase outlet pipeline of the lower inner pipe 32, and controlling the oil content within a preset numerical value H2; the signal measured by the oil content analyzer 82 is transmitted to the second regulating valve 62 and the third regulating valve 63, and when the oil content measured by the oil content analyzer (82) is higher than a preset value H2, the second regulating valve 62 is adjusted to be larger and the third regulating valve 63 is adjusted to be smaller.
Through the steps S0-S4, the complete automatic separation of oil, gas and water can be realized, the industrial application is easy to realize, the liquid content in the separated gas is less than 0.5%, the water content in the oil is less than 1.0%, and the oil content in the water is less than 30 mg/L. Of course, in practice, the preset values of the liquid content in gas, the water content in oil and the oil content in water can be properly adjusted according to requirements, and the separated liquid content in gas, water content in oil and oil content in water are controlled below preset standards.
Preferably, the adjustment of the valve opening degrees of the first regulating valve 61, the second regulating valve 62, the third regulating valve 63, and the fourth regulating valve 64 in the above steps may be set to stepless fine adjustment. In another embodiment, if the first, second, third, and fourth control valves 61, 62, 63, and 64 are manual control valves, manual control is required.
In step S3, when the liquid level is higher than the preset value H1, the first regulating valve 61 is turned down to achieve the preset gas-liquid separation effect; the fourth regulating valve 64 is enlarged, so that the control signal can return, and stable separation is realized. In addition, when the liquid level is higher than the preset value H1 when the liquid content in the gas phase outlet line (liquid content in gas) is low, only the first regulating valve 61 or the fourth regulating valve 64 may be adjusted alone. However, when the gas-liquid content suddenly increases, the first and fourth control valves 61 and 64 need to be simultaneously adjusted in order to rapidly decrease the gas-liquid content. Similarly, in step S4, when the oil content (oil content in water) in the aqueous phase outlet line is low, when the oil content is higher than the preset value H2, only the second regulating valve 62 or the third regulating valve 63 may be adjusted alone. However, when the oil content in water is suddenly increased, the second and third regulating valves 62 and 63 need to be simultaneously regulated in order to rapidly decrease the oil content in water.
Furthermore, as can be seen from fig. 1, if only the second regulating valve 62 installed on the oil phase outlet pipeline is separately adjusted, and the other valves are not moved, the oil content in the water is reduced, and the liquid level in the liquid collecting chamber is lowered. When the valve linkage adjustment is set, the operation can be one of the working conditions.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above examples only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. A pipeline type oil-gas-water separation system is characterized by comprising:
the upper-layer sleeve structure (1) comprises an upper-layer outer pipe (11) and an upper-layer inner pipe (12) which are horizontally arranged; one end of the upper layer inner pipe (12) is provided with a gas phase outlet (15), and the top of the upper layer inner pipe (12) is provided with a first inlet (13);
the middle-layer sleeve structure (2) comprises a middle-layer outer pipe (21) and a middle-layer inner pipe (22) which are horizontally arranged; one end of the middle-layer inner pipe (22) is provided with a liquid inlet (4), and the other end is provided with an oil phase outlet (25); the top of the middle-layer inner pipe (22) is provided with a first outlet (23), and the bottom of the middle-layer inner pipe is provided with a second outlet (24);
the lower-layer sleeve structure (3) comprises a lower-layer outer pipe (31) and a lower-layer inner pipe (32) which are horizontally arranged; one end of the lower layer inner pipe (32) is provided with a water phase outlet (35), and the bottom of the lower layer inner pipe (32) is provided with a second inlet (34);
at least one first riser (51) for communicating the upper outer pipe (11) and the middle outer pipe (21);
at least one second riser (52) for communicating the middle layer outer tube (21) and the lower layer outer tube (31).
2. The pipeline type oil-gas-water separation system according to claim 1, wherein the upper layer outer pipe (11) and the upper layer inner pipe (12) are eccentrically arranged, and the upper gap between the upper layer outer pipe (11) and the upper layer inner pipe (12) is smaller than the lower gap;
the middle layer outer pipe (21) and the middle layer inner pipe (22) are coaxially arranged;
the lower outer pipe (31) and the lower inner pipe (32) are eccentrically arranged, and the gap between the upper outer pipe (31) and the lower inner pipe (32) is larger than that between the lower outer pipe and the lower inner pipe.
3. The tubular oil-gas-water separation system according to claim 2, wherein the ratio of the upper gap to the lower gap between the upper outer tube (11) and the upper inner tube (12) is 1:3, and the ratio of the upper gap to the lower gap between the lower outer tube (31) and the lower inner tube (32) is 3: 1.
4. The pipeline type oil-gas-water separation system according to claim 1, wherein the bottom of the upper layer outer pipe (11) is communicated with the top of the middle layer outer pipe (21) through a plurality of first vertical pipes (51) which are obliquely arranged, and the bottom of the middle layer outer pipe (21) is communicated with the top of the lower layer outer pipe (31) through a plurality of second vertical pipes (52) which are vertically arranged.
5. The pipeline type oil-gas-water separation system according to claim 4, wherein the inclination angle α of the first vertical pipe (51) is 15-45 degrees, the horizontal distance is 1-1.8m, the number of the first vertical pipes is 6-12, and the distance between the second vertical pipes (52) is 1-1.8m, the number of the second vertical pipes is 6-12.
6. The pipeline type oil-gas-water separation system of claim 1, wherein the mixing flow rate of the mixed liquid of oil, gas and water is 20-30m3H, the volume gas content is not higher than 30 percent, and the volume water content in the liquid phase is not higher than 60 percent,
the inner diameter of the upper-layer outer pipe (11) is 100mm, the inner diameter of the upper-layer inner pipe (12) is 50mm, the outer diameter of the upper-layer inner pipe (12) is 60mm, the diameter of a first inlet (13) formed in the top of the upper-layer inner pipe (12) is 6mm, the number of the first inlets is 80, the gap between the upper-layer outer pipe (11) and the upper-layer inner pipe (12) is 10mm, and the gap between the lower parts of the upper-layer outer pipe and the upper-layer inner pipe is 30 mm;
the inner diameter of the middle-layer outer pipe (21) is 100mm, the inner diameter of the middle-layer inner pipe (22) is 50mm, the outer diameter of the middle-layer inner pipe (22) is 60mm, the diameter of first outlets (23) formed in the top of the middle-layer inner pipe (22) is 6mm, the number of the first outlets is 80, and the diameter of second outlets (24) formed in the bottom of the middle-layer inner pipe is 8mm, and the number of the second outlets is 80;
the inner diameter of the lower-layer outer pipe (31) is 100mm, the inner diameter of the lower-layer inner pipe (32) is 50mm, the outer diameter of the lower-layer inner pipe (32) is 60mm, the diameter of second inlets (34) formed in the bottom of the lower-layer inner pipe (32) is 8mm, the number of the second inlets is 80, the gap between the upper portion of the lower-layer outer pipe (31) and the lower portion of the lower-layer inner pipe (32) is 30mm, and the gap between the lower portion of the lower-layer;
the inner diameter of the first vertical pipe (51) is 50mm, the inclination angle α is 30 degrees, the horizontal distance is 1m, and the number of the vertical pipes is 6;
the inner diameter of the second stand pipe (52) is 50mm, the distance is 1m, and the number is 6.
7. The pipeline type oil-gas-water separation system according to claim 1, wherein the first inlet (13), the first outlet (23), the second outlet (24) and the second inlet (34) are all through holes and/or slits.
8. The tubular oil-gas-water separation system according to any one of claims 1 to 7, further comprising a first regulating valve (61) and a liquid collecting chamber (71) sequentially installed on the gas phase outlet line of the upper inner tube (12), a second regulating valve (62) installed on the oil phase outlet line of the middle inner tube (22), a return line (72) communicating the liquid collecting chamber (71) with the outlet of the second regulating valve (62), a third regulating valve (63) installed on the water phase outlet line of the lower inner tube (32), and a fourth regulating valve (64) installed on the return line (72).
9. The tubular oil-gas-water separation system according to claim 8, further comprising a liquid level detector (81) installed in the liquid collection chamber (71), and an oil content analyzer (82) installed on the water phase outlet line of the lower inner tube (32).
10. The pipeline type oil-gas-water separation system according to claim 9, wherein the first regulating valve (61), the second regulating valve (62), the third regulating valve (63) and the fourth regulating valve (64) are all electric regulating valves; the liquid level detector (81) is in communication connection with the first regulating valve (61) and the fourth regulating valve (64) respectively and controls the opening degree of the corresponding valves; the oil content analyzer (82) is in communication connection with the second regulating valve (62) and the third regulating valve (63) respectively and controls the opening degree of the corresponding valves.
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| CN201920415502.9U CN210068124U (en) | 2019-03-28 | 2019-03-28 | Pipeline type oil-gas-water separation system |
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| CN201920415502.9U CN210068124U (en) | 2019-03-28 | 2019-03-28 | Pipeline type oil-gas-water separation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944579A (en) * | 2019-03-28 | 2019-06-28 | 中国海洋石油集团有限公司 | Pipe type oil separating system for water and separation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944579A (en) * | 2019-03-28 | 2019-06-28 | 中国海洋石油集团有限公司 | Pipe type oil separating system for water and separation method |
| CN109944579B (en) * | 2019-03-28 | 2023-12-01 | 中国海洋石油集团有限公司 | Pipeline type oil-gas-water separation system and separation method |
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