CN116291359A - Dynamic cyclone pre-diversion equipment and method for oilfield gas-containing produced liquid - Google Patents
Dynamic cyclone pre-diversion equipment and method for oilfield gas-containing produced liquid Download PDFInfo
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- CN116291359A CN116291359A CN202310562695.1A CN202310562695A CN116291359A CN 116291359 A CN116291359 A CN 116291359A CN 202310562695 A CN202310562695 A CN 202310562695A CN 116291359 A CN116291359 A CN 116291359A
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- 239000007788 liquid Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 230000003068 static effect Effects 0.000 claims abstract description 34
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 239000012071 phase Substances 0.000 claims description 32
- 239000012530 fluid Substances 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 10
- 238000009987 spinning Methods 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 65
- 239000010779 crude oil Substances 0.000 abstract description 3
- 235000019198 oils Nutrition 0.000 description 58
- 239000011295 pitch Substances 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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Abstract
The invention relates to a dynamic cyclone pre-diversion device and a method for oilfield gas-containing produced liquid, wherein the device comprises the following components: the liquid inlet cylinder is internally provided with a gas control overflow pipe, a driving mechanism is arranged at the first end of the gas control overflow pipe, and a dynamic rotation element is arranged at the second end of the gas control overflow pipe; the static separation cylinder body is internally provided with an oil discharge vortex breaking table for discharging an oil phase; the liquid inlet cylinder body and the static separation cylinder body are coaxially and serially connected. The device realizes the oil-water pre-separation of the gas-containing produced liquid of the oil field by a countercurrent exhaust and concurrent oil discharge method. The countercurrent exhaust prevents free gas from forming gas core to influence the oil phase to converge towards the center of the pipeline, and the countercurrent exhaust liquid-containing gas phase and the concurrent exhaust oil phase are converged and then jointly enter the crude oil treatment system, so that the control of the liquid content of the exhaust gas is not needed.
Description
Technical Field
The invention relates to a dynamic cyclone pre-diversion device and method for oilfield gas-containing produced liquid, and belongs to the technical field of oilfield produced liquid pre-diversion.
Background
Along with the continuous increase of exploitation intensity of most of oil fields in China entering the middle and later stages, the water content of oil field produced liquid is generally higher. In order to reduce the impact caused by the great increase of produced water, the research on underground and uphole pre-water-separating technology is widely focused. The cyclone separator has compact structure and high separation efficiency, and is the first choice of the pre-water-separating equipment of the oil field, in particular to the offshore oil field.
However, a large amount of associated gas often exists in the oilfield produced fluid, and the gas density is very small compared with the oil-water two-phase density, so that gas phase is rapidly converged to the center of the cyclone separator and forms gas nuclei in the cyclone separation process, and the existence of the gas nuclei prevents the oil phase from smoothly flowing out of the overflow port, so that part of the oil phase is downwards moved and then flows out of the bottom flow port. In general, when the incoming liquid gas content exceeds 2%, the separation performance of the static hydrocyclone is rapidly lowered. In order to reduce the negative influence of the gas contained in the oilfield produced liquid on the separation performance of the cyclone separation equipment, the prior art adopts the measures of gas-liquid separation firstly; however, in order to reduce the liquid content of the gas-liquid separator exhaust gas, the flow rate of the exhaust gas needs to be smaller than the gas content of the incoming liquid, so that the liquid outlet still contains a certain amount of gas, and the gas content of the liquid outlet is usually below 10%. The high gas content obviously cannot ensure that the cyclone separator, particularly the tubular dynamic cyclone separator, works under the optimal working condition.
In summary, the cyclone separation equipment with a compact structure is the first choice of the high-water-content oilfield pre-water separation equipment, but the separation performance of the cyclone pre-water separation equipment is seriously affected by the gas content of the oilfield produced fluid.
Disclosure of Invention
Aiming at the technical problems, the invention provides the device and the method for dynamically cyclone pre-diversion of the oilfield gas-containing produced liquid, which have the advantages of compact structure and high separation efficiency, and can still keep higher separation performance under the working condition that the gas content of the incoming liquid is up to 20 percent.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an oilfield gas production fluid dynamic cyclone pre-water device, comprising:
the liquid inlet cylinder is internally provided with a gas control overflow pipe, a driving mechanism is arranged at the first end of the gas control overflow pipe, and a dynamic rotation element is arranged at the second end of the gas control overflow pipe;
the static separation cylinder body is internally provided with an oil discharge vortex breaking table for discharging an oil phase;
the liquid inlet cylinder body and the static separation cylinder body are coaxially and serially connected.
The dynamic rotational flow pre-water pre-separation device for the oilfield gas-containing produced liquid preferably comprises a plurality of gradual change spiral blades with gradually increased screw pitches uniformly distributed along the periphery of the gas control overflow pipe.
The first part of the blade is preferably arranged on the gas control overflow pipe, and the second part extends to a direction close to the static separation cylinder body and is in a suspended state.
The length of the second part of the blade is preferably 0.3-0.7 times of the inner diameter of the gas control overflow pipe.
The dynamic rotational flow pre-water pre-separating device for the oilfield gas-containing produced liquid is characterized in that preferably, a blade sleeve is further arranged in the liquid inlet cylinder, and the blade sleeve is sleeved outside the dynamic rotation starting element.
The axial length of the blade sleeve is preferably the same as the length of the blade of the dynamic cyclone pre-water pre-separation device for the oilfield gas-containing produced liquid.
In the oilfield gas-containing produced liquid dynamic cyclone pre-water device, preferably, the oil discharging vortex breaking table is of a hollow round table structure, and the oil discharging vortex breaking table and the static separation cylinder are coaxially arranged.
The dynamic cyclone pre-water device for the oilfield gas production fluid is characterized in that the dynamic cyclone element and the static separation cylinder are coaxially arranged.
The oil field gas-bearing produced liquid dynamic rotational flow pre-water equipment is characterized in that preferably, a liquid inlet is formed in the liquid inlet barrel, an oil drain port and a water drain port are formed in one end, away from the liquid inlet barrel, of the static separation barrel, and the oil drain port and the oil drain vortex breaking platform are coaxially arranged.
The second aspect of the invention provides a water diversion method of the oilfield gas-containing produced liquid dynamic cyclone pre-diversion equipment, which comprises the following steps:
the oil field gas-containing produced liquid enters the liquid inlet cylinder body from the liquid inlet, the dynamic rotation element rotates under the drive of the driving mechanism, and gas in the oil field gas-containing produced liquid is rapidly converged to the center under the action of centrifugal force and is discharged from the gas control overflow pipe; the liquid phase enters the static separation cylinder after being accelerated by the latter half part of the dynamic rotation element, and the oil phase gradually converges towards the center under the action of centrifugal force after the fluid rotating at high speed enters the static separation cylinder, and finally is discharged from the oil discharge vortex breaking table.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention realizes the oil-water pre-separation of the gas-containing produced liquid in the oil field by a countercurrent exhaust and concurrent oil discharge method. The countercurrent exhaust prevents free gas from forming gas core to influence the oil phase to converge towards the center of the pipeline, and the countercurrent exhaust liquid-containing gas phase and the concurrent exhaust oil phase are converged and then jointly enter the crude oil treatment system, so that the control of the liquid content of the exhaust gas is not needed.
2. The device disclosed by the invention has the advantages of compact structure, simple manufacturing process and convenience in maintenance, can be directly assembled on an oil pipeline, and can also be used as underground pre-water-pre-distribution equipment. Compared with the prior art, the oil-water separation capacity of the dynamic cyclone separation equipment on the produced liquid of the oil field with high gas content is greatly improved, and the dynamic cyclone separation equipment has considerable popularization value.
Drawings
FIG. 1 is a cross-sectional view of an oilfield gas production fluid dynamic swirl pre-water apparatus provided in one embodiment of the invention;
FIG. 2 is an exploded view of the dynamic cyclone pre-water separation device for the gas-containing produced fluid in the oil field according to the embodiment of the invention;
FIG. 3 is a schematic diagram of the flow direction of the oil field gas-containing produced fluid dynamic cyclone pre-water separation device according to the embodiment of the present invention;
the figures are marked as follows:
1-an air control overflow pipe; 2-a liquid inlet cylinder; 3-a dynamic spinning element; 4-leaf sleeve; 5-stationary separation cylinder; 6-an oil discharge vortex breaking table; 7-an oil drain port; 8-a water outlet; 9-a liquid inlet; 10-drive mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," "third," "fourth," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The invention provides a dynamic cyclone pre-diversion device and a method for oilfield gas-containing produced liquid, which aim at the problem of insufficient capacity of the existing dynamic cyclone separation device for treating oilfield gas-containing produced liquid.
The invention discloses dynamic rotational flow pre-water pre-separation equipment for oilfield gas-containing produced liquid, which adopts a method of countercurrent exhaust and downstream oil collection to rapidly discharge free-state gas entering a liquid inlet cylinder body and prevent disturbance of gas check oil cores; the oil-water two phases are separated in a longer separator cylinder, so that the oil-water two phases with smaller density difference have long enough separation time, and discharged gas and oil are combined and then enter a subsequent treatment system without controlling the liquid content of an exhaust port. The device is driven by a dynamic rotation element driven by a driving mechanism to drive the oil/water/gas mixture entering the device to rotate at a high speed, and gas phases with very low density are converged at the center of a pipeline under the action of centrifugal force and discharged from a gas control overflow pipe. The oil phase with the density similar to that of water gradually converges towards the center in the longer static separation cylinder, and is discharged from the hollow area of the oil discharging vortex breaking table positioned at the tail part of the static separation cylinder. The device solves the problem of reduced cyclone separation performance caused by gas contained in the produced liquid, has compact structure, simple manufacturing process, convenient maintenance and low pressure loss, and provides an effective solution for pre-separating the produced liquid, particularly the gas-contained produced liquid, of an offshore oil production platform, particularly a deep-sea oil production platform.
The technical scheme of the invention is described in detail below with reference to specific examples.
As shown in fig. 1 and 2, the dynamic cyclone pre-water pre-separation device for the oilfield gas production fluid comprises:
the liquid inlet cylinder body 2, the inside of the liquid inlet cylinder body 2 is provided with a gas control overflow pipe 1, a first end of the gas control overflow pipe 1 is provided with a driving mechanism 10, and a second end of the gas control overflow pipe is provided with a dynamic rotation starting element 3; the static separation cylinder body 5, wherein an oil discharge vortex breaking table 6 is arranged in the static separation cylinder body 5 and used for discharging an oil phase; the liquid inlet cylinder 2 and the static separation cylinder 5 are coaxially and serially connected.
In some preferred embodiments of the present invention, the dynamic spinning element 3 comprises a plurality of gradually changing spiral blades with gradually increasing pitches (the gradually increasing pitches refer to gradually increasing pitches from one end of the produced liquid inlet blade to one end of the produced liquid outlet blade) which are uniformly arranged along the periphery of the gas control overflow pipe 1, and the minimum pitch of the blades is 1 times of the outer diameter of the blades, and the maximum pitch is 2 times of the outer diameter of the blades.
Further, the first part of the blade is installed on the gas control overflow pipe 1, and the second part extends to a direction approaching to the static separation cylinder 5 and is in a suspended state. The length of the second part of the blade is 0.3-0.7 times of the inner diameter of the gas control overflow pipe 1, preferably, the length of the second part of the blade is 0.5 times of the inner diameter of the gas control overflow pipe 1, so that smooth discharge of gas phase can be ensured, and convergence of oil phase towards the center can be ensured.
In some preferred embodiments, a vane sleeve 4 is also provided within the feed cylinder 2, the vane sleeve 4 being disposed externally of the dynamic spinning element 3.
Further, the axial length of the vane sleeve 4 is the same as the length of the vane.
The vane sleeve 4, the dynamic rotation element 3 and the gas control overflow pipe 1 form 6 axially relatively independent sector areas together, fluid in the sector areas rotates along with the vane sleeve during operation, and gas is rapidly converged to the center of the pipeline under the action of centrifugal force and is discharged from the gas control overflow pipe 1; the liquid phase (oil-water mixture) accelerated by the latter half of the dynamic rotation element 3 enters the static separation cylinder 5, the fluid rotating at high speed enters the static separation cylinder 5, the oil phase with smaller density gradually moves towards the center under the action of centrifugal force, finally is discharged from the oil discharging vortex breaking table 6, and the water phase is transferred to the outer ring region of the cylinder under the action of large centrifugal force and finally is discharged through the water outlet 8.
As shown in fig. 2, in some examples, the oil extraction vortex breaking table 6 has a hollow truncated cone-shaped structure, and the oil extraction vortex breaking table 6 is coaxially disposed with the stationary separation cylinder 5.
As shown in fig. 1, the dynamic spinning element 3 is arranged coaxially with the stationary separation cylinder 5 and maintains the same diameter. The liquid inlet cylinder 2 is connected with the end part of the static separation cylinder 5 through a flange, and the other end of the static separation cylinder 5 is connected with the oil drain port 7 through a flange. Of course, the liquid inlet cylinder 2 and the static separation cylinder 5 may be an integral fixed connection structure, and the connection mode of the liquid inlet cylinder 2 and the static separation cylinder is not limited in the invention.
Further, as shown in fig. 1, a liquid inlet 9 is provided on the liquid inlet cylinder 2, an oil drain 7 and a water outlet 8 are provided at one end of the stationary separation cylinder 5 away from the liquid inlet cylinder 2, and the oil drain 7 is coaxially provided with the oil drain vortex breaking table 6.
As shown in fig. 3, the invention also provides a water diversion method of the oilfield gas production fluid dynamic cyclone pre-diversion device, which comprises the following steps:
the oilfield gas-containing produced liquid enters the liquid inlet cylinder 2 from the liquid inlet 9, the dynamic rotation element 3 rotates under the drive of the driving mechanism 10, and the gas in the oilfield gas-containing produced liquid is rapidly converged to the center under the action of centrifugal force and is discharged from the gas control overflow pipe 1; the liquid phase enters the static separation cylinder 5 after being accelerated by the latter half of the dynamic rotation element 3, and the oil phase gradually converges towards the center under the action of centrifugal force after the fluid rotating at high speed enters the static separation cylinder 5, and finally is discharged from the oil discharging vortex breaking table 6.
Aiming at different physicochemical characteristics of oil/gas/water three phases, the device provided by the invention realizes the pre-water operation of the gas-containing produced liquid of the oil field by a mode of reversely exhausting and downstream oil collection. The specific working principle of the device is as follows:
after the oilfield gas-containing produced liquid enters the dynamic cyclone pre-water device, the dynamic cyclone element 3 forces the produced liquid to generate strong cyclone motion, and gas phases with very small density are collected to the center of a pipeline firstly under the centrifugal force generated by cyclone due to the density difference of the oil/gas/water phases, and are rapidly reversely discharged from the gas control overflow pipe 1.
The liquid-containing gas phase discharged in the countercurrent and the oil phase discharged in the concurrent flow are converged and enter the crude oil treatment system, the liquid content of the discharged gas is not required to be controlled, the flow of the countercurrent exhaust is larger than the gas content of the incoming flow, the gas content can be 1.1 times, the countercurrent exhaust is not limited to 1.1 times, and the method that the countercurrent exhaust and the concurrent flow are used for receiving oil and the gas content is larger than the gas content is adopted to eliminate the influence of gas core on the oil-water separation performance belongs to the protection scope of the invention.
The oil-water two-phase mixed liquid with strong rotational flow is separated in the longer static separation cylinder 5, so that the sufficient actual separation time of the oil-water two phases with smaller density difference is ensured. Wherein the water phase is transferred to the outer annular region of the separator barrel by a larger centrifugal force and discharged from the water outlet 8, and the oil phase with smaller density is collected in the center of the pipeline to form an oil core and is discharged downstream from the hollow region of the oil discharging vortex breaking table 6 positioned at the tail part of the barrel.
The main purpose of the countercurrent exhaust is to prevent the excessive free-state gas from forming gas nuclei to influence the oil phase to converge towards the center, but not to separate the gas phase in the mixed liquid.
The device solves the problem of insufficient capability of the existing rotational flow pre-diversion equipment for treating the high-air-content produced liquid water, has compact structure, simple manufacturing process and convenient maintenance, and is suitable for long-time operation.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a device is pre-watered in dynamic whirl of oil field gas-bearing produced liquid which characterized in that includes:
the device comprises a liquid inlet cylinder body (2), wherein a gas control overflow pipe (1) is arranged in the liquid inlet cylinder body (2), a driving mechanism (10) is arranged at a first end of the gas control overflow pipe (1), and a dynamic screwing element (3) is arranged at a second end of the gas control overflow pipe;
a static separation cylinder (5), wherein an oil discharge vortex breaking table (6) is arranged in the static separation cylinder (5) and is used for discharging an oil phase;
the liquid inlet cylinder body (2) and the static separation cylinder body (5) are coaxially and serially connected.
2. The oilfield gas production fluid dynamic cyclone pre-water separation device according to claim 1, wherein the dynamic cyclone element (3) comprises a plurality of gradual change helical blades which are uniformly arranged along the periphery of the gas control overflow pipe (1) and the pitch of which is gradually increased.
3. The oilfield gas production fluid dynamic cyclone pre-water separation device according to claim 2, wherein the first part of the blade is installed on the gas control overflow pipe (1), and the second part extends to a direction approaching the static separation cylinder (5) and is in a suspended state.
4. A dynamic rotational flow pre-water separation device for oilfield gas production fluids according to claim 3, wherein the length of the second part of the blade is 0.3-0.7 times the inner diameter of the gas control overflow pipe (1).
5. The oilfield gas production fluid dynamic cyclone pre-water device according to claim 2, wherein a blade sleeve (4) is further arranged in the fluid inlet cylinder (2), and the blade sleeve (4) is sleeved outside the dynamic spinning element (3).
6. The oilfield gas production fluid dynamic swirl pre-water apparatus of claim 5, wherein the vane sleeve (4) has an axial length equal to the length of the vanes.
7. The oilfield gas-containing produced liquid dynamic cyclone pre-water device according to claim 1, wherein the oil discharging vortex breaking table (6) is of a hollow round table structure, and the oil discharging vortex breaking table (6) and the static separation cylinder (5) are coaxially arranged.
8. The oilfield gas production fluid dynamic cyclone pre-separation device according to claim 1, wherein the dynamic cyclone element (3) is arranged coaxially with the stationary separation cylinder (5).
9. The oilfield gas-containing produced liquid dynamic cyclone pre-water device according to claim 1, wherein a liquid inlet (9) is formed in the liquid inlet cylinder (2), an oil drain port (7) and a water drain port (8) are formed in one end, far away from the liquid inlet cylinder (2), of the static separation cylinder (5), and the oil drain port (7) and the oil drain vortex breaking table (6) are coaxially arranged.
10. A method of diversion of oilfield gas production fluid by a dynamic cyclone pre-diversion apparatus according to any one of claims 1-9, comprising the steps of:
the oilfield gas-containing produced liquid enters the liquid inlet cylinder (2) from the liquid inlet (9), the dynamic rotation element (3) rotates under the drive of the driving mechanism (10), and the gas in the oilfield gas-containing produced liquid is rapidly converged to the center under the action of centrifugal force and is discharged from the gas control overflow pipe (1); the liquid phase enters the static separation cylinder (5) after being accelerated by the latter half part of the dynamic rotation element (3), and the high-speed rotating fluid enters the static separation cylinder (5), so that the oil phase gradually converges towards the center under the action of centrifugal force, and finally is discharged from the oil discharge vortex breaking table (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310562695.1A CN116291359B (en) | 2023-05-18 | 2023-05-18 | Dynamic rotational flow pre-water pre-separation equipment for oilfield gas-containing produced liquid |
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| CN202310562695.1A CN116291359B (en) | 2023-05-18 | 2023-05-18 | Dynamic rotational flow pre-water pre-separation equipment for oilfield gas-containing produced liquid |
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| CN116291359B CN116291359B (en) | 2023-08-15 |
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