CN112443298B - Self-adaptive oil well fluid control device and adjusting mechanism - Google Patents
Self-adaptive oil well fluid control device and adjusting mechanism Download PDFInfo
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- CN112443298B CN112443298B CN201910812257.XA CN201910812257A CN112443298B CN 112443298 B CN112443298 B CN 112443298B CN 201910812257 A CN201910812257 A CN 201910812257A CN 112443298 B CN112443298 B CN 112443298B
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- 239000012530 fluid Substances 0.000 title claims abstract description 163
- 230000007246 mechanism Effects 0.000 title claims abstract description 58
- 239000003129 oil well Substances 0.000 title claims abstract description 25
- 230000003044 adaptive effect Effects 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 14
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 75
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000012071 phase Substances 0.000 description 17
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
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- 238000000926 separation method Methods 0.000 description 2
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- 230000004075 alteration Effects 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a self-adaptive oil well fluid control device and an adjusting mechanism, wherein the self-adaptive oil well fluid control device comprises an oil pipe, an outer pipe and a self-adaptive adjusting mechanism, the oil pipe is concentrically arranged in the outer pipe, an annular channel is formed between the oil pipe and the outer pipe, the outer pipe is provided with an outer pipe fluid inlet, the oil pipe is provided with a radial fluid control port, and the self-adaptive adjusting mechanism is installed at the radial fluid control port. The oil well fluid flow rate control device can automatically adjust the flow resistance passing through the device according to the fluid properties: when the water content is low, the device has certain resistance to the fluid, and can counteract the influence of heel end effect and reservoir heterogeneity, so that the inflow profile is pushed in a balanced manner; the water content reaches a certain degree, the flow resistance of the fluid flow rate control device is obviously increased, and the flow of the water outlet interval is obviously inhibited, so that the long-term stable production of the oil-gas well is ensured.
Description
Technical Field
The invention relates to the technical field of devices for improving the development effect of an oil field, in particular to a self-adaptive oil well fluid control device and an adjusting mechanism.
Background
During field development, the production of a well at some locations is much higher than at others due to the effects of "heel-end effects" and/or reservoir heterogeneity, and the resulting non-uniform production profile may cause the wellbore to prematurely catch water/gas at those locations. Once coning occurs, the well production will be significantly reduced due to the flow restriction elsewhere. In order to eliminate the unbalance, sectional perforation and variable density perforation completion, central tube completion and the like are commonly used. However, these methods have limited ability to control the inflow profile and it is difficult to ensure a sufficiently uniform production profile.
By 2018, different types of inflow control devices have been developed in succession at home and abroad, including passive inflow control devices and adaptive inflow control devices. The passive inflow control device delays water breakthrough by equalizing inflow, but once the water phase is coning, the water phase completely fills the oil well due to the low viscosity of the water phase and inhibits the flow of the oil phase, so that the device fails and the yield of the oil well is reduced. The self-adaptive inflow control device can automatically recognize and remarkably increase resistance once water is leaked, so that the flow of a water phase is inhibited, and the long-term stable yield of an oil well is ensured. However, the adaptive inflow control device also has the defects of complex structure, incapability of meeting the development requirement of high water content in the oil field and the like.
Application No.: 201910032842.8 discloses a regulation and control device and a use method suitable for improving the water environment of a low-flow-rate water body, wherein four sides of a square shell are respectively fixed with a plate frame, the end part of the plate frame is provided with an oil cylinder frame, an oil cylinder is arranged on the oil cylinder frame, the end part of a piston rod of the oil cylinder is provided with a material box through a material seat, the bottom of the material box is provided with an electronic valve, the bottom of the plate frame is provided with a floater through a ring plate, the bottom of the square shell is provided with an oxygen increasing device for increasing oxygen to the water body, and the bottom of the oxygen increasing device is provided with a power device for pushing the whole regulation and control device to move in the water; the square shell is provided with a remote control annunciator through a wire holder, and the remote control annunciator is connected with a controller for controlling the whole regulation and control device. The device can effectively improve the environment of the low-flow-rate water body.
Application No.: 201811575785.X discloses a flow rate control device of a layered polymer injector and a concentric stepping layered polymer injector, which relate to the field of geoscience, wherein the flow rate control device of the layered polymer injector comprises: the device comprises a layered polymer injection device, a control device and a control system, wherein the layered polymer injection device is provided with a water injection flow channel, an upper joint of the layered polymer injection device is connected with a water injection water tank through a pipeline, a flow velocity sensor is arranged on the pipeline and connected with an input end of a controller, an output end of the controller is connected with a pressurizing pump, and the pressurizing pump is also connected with the water injection water tank; the flow velocity sensor is used for measuring the flow velocity entering the water injection flow channel; and the controller is used for controlling the work or the non-work of the pressurizing pump according to the flow rate and the set flow rate. The problem that the injection cannot be completed on time due to the fact that the liquid outlet hole of the layered polymer injection device is blocked and the instrument needs to be repeatedly taken down for throwing and fishing or the injection efficiency is low is solved.
Application No.: 201410705724.6A multistage parallel hydrocyclone with adjustable flow rate comprises a frame and a hydrocyclone barrel, the barrel inner cavity is divided into a solid-liquid separation chamber and a solid discharge chamber via a transverse partition plate, and the upper end cover and the lower end of the hydrocyclone barrel are respectively provided with an upper end cover and a conical joint; comprises a plurality of swirlers consisting of a swirler cylinder body at least provided with a longitudinal cutting slit, an overflow pipe and a packing sleeve with a plurality of radial threaded holes; the upper end of the cyclone cylinder body is inserted and fixed on the upper end cover, and the lower end of the cyclone cylinder body penetrates through the transverse partition plate; the overflow pipe is inserted into the cyclone cylinder body, a ring cavity is formed between the overflow pipe and the cyclone cylinder body, a flange plate detachably and fixedly connected with the upper end cover is fixedly arranged on the overflow pipe, and a positioning hole is formed in the outer side surface of the overflow pipe; the filler is sleeved in the annular cavity and fixedly connected with the overflow pipe through a screw; the pipeline collecting device comprises a manifold structure consisting of a main joint and a plurality of pipelines. The hydrocyclone meets different liquid production working conditions by opening the number of the cyclone, and changes the flow speed of oil-gas mixed liquid entering the cyclone cylinder by changing the upper position and the lower position of the filler sleeve, thereby achieving better solid-liquid separation effect.
The technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.
Disclosure of Invention
The invention aims to provide a self-adaptive oil well fluid control device and an adjusting mechanism, and solves the problem that the self-adaptive inflow control device in the prior art cannot meet the development requirement of an oil well with high water content in an oil field. The oil well fluid flow rate control device can automatically adjust the flow resistance passing through the device according to the fluid properties: when the water content is lower, the device has certain resistance to the fluid, and can counteract the influence of heel-end effect and reservoir heterogeneity, so that the inflow profile is pushed in a balanced manner; the water content reaches a certain degree, the flow resistance of the fluid flow rate control device is obviously increased, and the flow of the water outlet interval is obviously inhibited, so that the long-term stable production of the oil-gas well is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme that the self-adaptive oil well fluid control device comprises an oil pipe, an outer pipe and a self-adaptive adjusting mechanism, wherein the oil pipe is concentrically arranged in the outer pipe, an annular channel is formed between the oil pipe and the outer pipe, the outer pipe is provided with an outer pipe fluid inlet, the oil pipe is provided with a radial fluid control port, and the self-adaptive adjusting mechanism is installed at the radial fluid control port; the self-adaptive adjusting mechanism comprises a shell and a fixing device, wherein the shell is fixed in the fixing device, the fixing device is fixed at a radial fluid control port in a sealing mode, the fixing device is provided with a main fluid channel which is axially communicated, the upper end of the fixing device is also provided with a fluid inlet of the fixing device, the fluid inlet of the fixing device is communicated with the middle of the main fluid channel, the shell is provided with a central cavity and an eccentric fluid control channel, the central cavity is equivalent to a piston cavity, a movable adjusting module is arranged in the central cavity and is equivalent to a piston, the movable adjusting module is in sliding type sealing connection with the inner wall of the central cavity, the upper end of the fluid control channel is communicated with the main fluid channel, the lower end of the fluid control channel is communicated with the bottom of the central cavity of the shell, the lower end of the fixing device is provided with a flow control channel outlet, and the flow control channel outlet is communicated with the bottom of the central cavity of the shell.
The outer tube and the oil tube are fixedly connected through the connecting device, the connecting device comprises a left concentric connector and a right concentric connector, the left concentric connector and the right concentric connector are identical in structure and are fixedly connected together through bolts, the concentric connector or the right concentric connector comprises an outer ring, an inner ring and a middle ring, the middle ring is connected between the outer ring and the inner ring, the middle ring is provided with an axial through hole for communicating an annular channel between the oil tube and the outer tube, the outer tube is connected in a threaded mode, and the inner ring is connected in a threaded mode through the outer tube.
The fluid control passageway is a serpentine shaped tortuous passageway.
The outer diameter of the upper half section of the movable adjusting module is smaller than that of the lower half section of the movable adjusting module, the lower half section of the movable adjusting module is connected with the outer wall of the central cavity in a sliding sealing mode, a necking ring of an integrated structure is arranged at the upper port of the central cavity of the shell, and the inner diameter of the necking ring is larger than or equal to the outer diameter of the upper half section of the movable adjusting module and is smaller than the outer diameter of the lower half section of the movable adjusting module.
The height of the upper half section of the movable adjusting module is larger than the thickness of the necking ring, but the sum of the thickness of the necking ring and the diameter of the main fluid channel is larger than the height of the upper half section of the movable adjusting module.
The radial end surface of the movable adjusting module is opposite to the fluid inlet of the fixing device.
In order to achieve the above purpose, the present invention adopts the following technical scheme that a fluid flow rate self-adaptive adjusting mechanism comprises a housing and a fixing device, wherein the housing is fixed inside the fixing device, the fixing device is fixed inside a radial fluid control port in a sealing manner, the fixing device is provided with a main fluid channel which is axially communicated, the upper end of the fixing device is also provided with a fluid inlet of the fixing device, the fluid inlet of the fixing device is communicated with the middle of the main fluid channel, the housing is provided with a central cavity and an eccentric fluid control channel, the central cavity is equivalent to a piston cavity, a movable adjusting module is installed in the central cavity, the movable adjusting module is equivalent to a piston, the movable adjusting module is in sliding type sealing connection with the inner wall of the central cavity, the upper end of the fluid control channel is communicated with the main fluid channel, the lower end of the fluid control channel is communicated with the bottom of the central cavity of the housing, the lower end of the fixing device is provided with a flow control channel outlet, the flow control channel outlet is communicated with the bottom of the central cavity of the housing, and the fluid control channel is a serpentine curved channel.
The outer diameter of the upper half section of the movable adjusting module is smaller than that of the lower half section of the movable adjusting module, the lower half section of the movable adjusting module is connected with the outer wall of the central cavity in a sliding sealing mode, a necking ring of an integrated structure is arranged at an upper port of the central cavity of the shell, the inner diameter of the necking ring is larger than the outer diameter of the upper half section of the movable adjusting module and smaller than the outer diameter of the lower half section of the movable adjusting module, the height of the upper half section of the movable adjusting module is larger than that of the necking ring, the sum of the thickness of the necking ring and the diameter of the main fluid channel is larger than that of the upper half section of the movable adjusting module, and the radial end face of the movable adjusting module is right opposite to the fluid inlet of the fixing device.
Compared with the prior art, the invention has the following beneficial effects:
the forces acting on the adaptive adjustment mechanism of the present invention are mainly self-weight, fluid pressure on the upper surface and fluid pressure on the lower surface. When the fluid in the fluid space is water, the upward force borne by the self-adaptive adjusting mechanism is larger than the downward force borne by the self-adaptive adjusting mechanism, the self-adaptive adjusting mechanism is positioned at the uppermost position, the flow area of the main flow channel is minimum, and the additional resistance of the device is maximum; when the water content of the fluid in the flowing space is reduced, the viscosity of the oil phase fluid is higher, and greater resistance loss is generated when the oil phase fluid passes through the flow control channel than water, so that the upward force borne by the self-adaptive adjusting mechanism is reduced, the self-adaptive adjusting mechanism moves downwards until the stress of the device is balanced, the overflowing area of the main flowing channel is increased at the moment, and the additional resistance of the device is reduced; when the water content of the device rises again until the fluid is water completely, the self-adaptive adjusting mechanism returns to the uppermost position again due to stress balance, and the water output is limited.
The flow area of the main flow channel is controlled by the self-adaptive adjusting mechanism. The flow resistance generated by the flow control flow passage is affected by the flow rate and the water content of the oil-water two-phase fluid. The device is designed for overcoming the defect that the self-adaptive inflow control device at the present stage cannot identify the water content under the high water content condition, so that the effective fluid control on a target interval is realized in the development process of a high water content period in an oil well. The strength and the precision of the controlled fluid of the device are changed by changing the surface area of the upper platform and the lower platform of the self-adaptive adjusting mechanism, the self gravity, the flow area of the main flow channel, the length of the flow control channel, the cross section area of the flow control channel and the surface roughness of the flow control channel.
The self-adaptive adjusting mechanism comprises a movable disc, and the position of the movable disc is influenced by the flow and the water content of the oil-water two-phase fluid. When the main flow channel is closed (the self-adaptive adjusting mechanism is in the upper position), the flow area of the main flow channel is reduced to 0-95% of the initial flow area. After the main flow channel is closed, if the water content of the oil-water two-phase fluid is reduced, the flow area of the main flow channel is recovered. Formation fluid flows from the annular space into the tubular body. The self-adaptive adjusting mechanism can set the critical water content aiming at the reduction of the water content in the oil-water two-phase fluid, and the flowing main channel is completely opened when the water content is lower than the critical water content.
From the above, the self-adaptive inflow control device for the oil well control fluid, provided by the invention, is based on the Bernoulli principle and the stress balance principle, and can identify the type of the fluid and automatically adjust the resistance level of the device, when the water content is low, the resistance of the device to the fluid is small, the oil yield is not influenced, when the water content is increased, the resistance of the device is automatically adjusted, the water yield is limited, and the long-term stable yield of the oil well is ensured.
Drawings
FIG. 1 is a schematic diagram of the construction of the adaptive well control fluid device of the present invention.
Fig. 2 is a schematic structural diagram of the adaptive adjustment mechanism of the present invention.
FIG. 3 is a schematic diagram of the adaptive control mechanism of the present invention under high moisture conditions.
In the figure: 1. a fluid inlet; 2. a fluid inlet; 3. a fluid inlet; 4. an outer tube; 5. an oil pipe; 6. an annulus passageway; 7. a main flow channel; 8. a connecting device; 9. a self-adaptive adjusting mechanism; 10. a self-adaptive adjusting mechanism; 11. a fluid inlet; 12. a primary fluid passageway; 13. a primary fluid passageway; 14. a flow control channel outlet; 15. a fixing device; 16. a flow control channel; 17. a flow control channel; 18. a movable conditioning module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a technical solution:
a self-adaptive oil well fluid control device comprises an oil pipe 5, an outer pipe 4 and self-adaptive adjusting mechanisms 9 and 10, wherein the oil pipe is concentrically arranged in the outer pipe, an annular channel 6 is formed between the oil pipe and the outer pipe, the outer pipe is provided with outer pipe fluid inlets 1, 2 and 3, the oil pipe is provided with radial fluid control ports, and the self-adaptive adjusting mechanisms are installed at the radial fluid control ports; the self-adaptive adjusting mechanism comprises a shell and a fixing device 15, wherein the shell is fixed in the fixing device, the fixing device is fixed at a radial fluid control port in a sealing mode, the fixing device is provided with main fluid channels 12 and 13 which are axially communicated, the upper end of the fixing device is also provided with a fixing device fluid inlet 11, the fixing device fluid inlet is communicated with the middle of the main fluid channel, the shell is provided with a central cavity and eccentric fluid control channels 16 and 17, the central cavity is equivalent to a piston cavity, a movable adjusting module 18 is installed in the central cavity, the movable adjusting module is equivalent to a piston, the movable adjusting module is in sliding type sealing connection with the inner wall of the central cavity, the upper end of the fluid control channel is communicated with the main fluid channel, the lower end of the fluid control channel is communicated with the bottom of the central cavity of the shell, the lower end of the fixing device is provided with a flow control channel outlet 14, and the flow control channel outlet is communicated with the bottom of the central cavity of the shell.
The outer tube and the oil tube are fixedly connected through the connecting device 8, the connecting device comprises a left concentric connector and a right concentric connector, the left concentric connector and the right concentric connector are identical in structure and fixed together through bolts, the concentric connector or the right concentric connector comprise an outer ring, an inner ring and a middle ring, the middle ring is connected between the outer ring and the inner ring, the middle ring is provided with an axial through hole for communicating an annular channel between the oil tube and the outer tube, the outer tube is connected in a threaded mode, and the inner ring is connected in a threaded mode.
The fluid control channels 16, 17 are serpentine shaped tortuous channels.
The outer diameter of the upper half section of the movable adjusting module is smaller than that of the lower half section of the movable adjusting module, the lower half section of the movable adjusting module is connected with the outer wall of the central cavity in a sliding sealing mode, a necking ring of an integrated structure is arranged at the upper port of the central cavity of the shell, and the inner diameter of the necking ring is larger than or equal to the outer diameter of the upper half section of the movable adjusting module and is smaller than the outer diameter of the lower half section of the movable adjusting module.
The height of the upper half section of the movable adjusting module is larger than the thickness of the necking ring, but the sum of the thickness of the necking ring and the diameter of the main fluid channel is larger than the height of the upper half section of the movable adjusting module.
The radial end surface of the movable adjusting module is opposite to the fluid inlet of the fixing device.
As shown in fig. 1, the invention provides a self-adaptive oil well fluid control device, which comprises fluid inlets 1, 2 and 3 and an oil pipe 5 penetrating through the inner part of an outer pipe 4, wherein the outer pipe 4 and the oil pipe 5 are coaxial and are fixed through a connecting device 8, the connecting device 8 does not influence the flow of fluid, two ends of the outer pipe 4 are closed, and the oil pipe 5 can be connected with other oil pipes; in the present embodiment, an annular flow space is formed between the outer pipe 4 and the oil pipe 5, and the fluid enters the adaptive adjustment mechanisms 9 and 10 through the annular flow space and flows into the oil pipe 5 from the outlets of the adaptive adjustment mechanisms 9 and 10.
Further, as shown in fig. 1 and 2, the adaptive adjusting mechanisms 9 and 10 include a housing and a fixing device, the housing is mounted on the oil pipe 5 through the fixing device 15, the fluid in the annular channel 6 flows into the adaptive adjusting mechanisms 9 and 10 through the fluid inlet 11, when the water content of the fluid is low, the upper surface and the lower surface of the movable adjusting module 18 are stressed in a balanced manner and are in an initial position, the maximum flow of the main fluid channels 12 and 13 is ensured, and at this time, the additional resistance of the adaptive adjusting mechanisms 9 and 10 is minimum.
Further, as shown in fig. 1, 2, and 3, when the water content of the fluid passing through the adaptive control mechanisms 9 and 10 increases, the viscosity of the aqueous phase is low, so that the resistance loss of the fluid passing through the flow control passages 16 and 17 decreases, the pressure on the lower surface of the movable adjustment module 18 increases, the movable adjustment module 18 moves upward from the initial position, the flow rates of the main fluid passages 12 and 13 and the flow control passages 16 and 17 decrease, and after the forces are balanced, the movable adjustment module 18 stops moving, and at this time, the additional resistance of the adaptive control mechanisms 9 and 10 is large.
Further, when the property of the reservoir fluid changes, the adaptive adjusting mechanisms 9 and 10 dynamically change, and when the fluid is a high-water-cut fluid, the position of the movable adjusting module 18 deviates far from the initial position until the stress balance is achieved, so that the water production of the high-water-cut interval is limited; when the fluid is a low water-cut fluid, the movable adjusting module 18 is closer to the initial position until the stress is balanced, and the oil production of the low water-cut interval is increased.
The invention relates to a self-adaptive oil well fluid control device, which comprises a main fluid flow channel, a fluid flow control channel, a self-adaptive adjusting mechanism and an outlet connected with the inner space of a pipe body, wherein the main fluid flow channel is provided with a plurality of fluid flow control channels; the main fluid flow channel is the main fluid flow space, the flow rate is controlled by the adaptive adjusting mechanism, and the flow control channel is the flow space formed by the adaptive adjusting mechanism and the control pipeline. Liquid can be discharged from the outlet of the control device through the main flow channel and the flow control channel.
The forces acting on the adaptive control mechanism are mainly the own weight, the fluid pressure of the upper surface and the fluid pressure of the lower surface. When the fluid in the fluid space is water, the upward force borne by the self-adaptive adjusting mechanism is larger than the downward force borne by the self-adaptive adjusting mechanism, the self-adaptive adjusting mechanism is positioned at the uppermost position, the flow area of the main flow channel is minimum, and the additional resistance of the device is maximum; when the water content of the fluid in the flowing space is reduced, the viscosity of the oil phase fluid is higher, and greater resistance loss is generated when the oil phase fluid passes through the flow control channel than water, so that the upward force borne by the self-adaptive adjusting mechanism is reduced, the self-adaptive adjusting mechanism moves downwards until the stress of the device is balanced, the overflowing area of the main flowing channel is increased at the moment, and the additional resistance of the device is reduced; when the water content of the device rises again until the fluid is water completely, the self-adaptive adjusting mechanism returns to the uppermost position again due to stress balance, and the water output is limited.
The flow area of the main flow channel is controlled by the self-adaptive adjusting mechanism. The flow resistance generated by the flow control flow passage is affected by the flow rate and the water content of the oil-water two-phase fluid. The device is designed for overcoming the defect that the self-adaptive inflow control device at the present stage cannot identify the water content under the high water content condition, so that the effective fluid control on a target interval is realized in the development process of a high water content period in an oil well. The strength and the precision of the controlled fluid of the device are changed by changing the surface area of the upper platform and the lower platform of the self-adaptive adjusting mechanism, the self gravity, the flow area of the main flow channel, the length of the flow control channel, the cross section area of the flow control channel and the surface roughness of the flow control channel.
The self-adaptive adjusting mechanism comprises a movable disc, and the position of the movable disc is influenced by the flow and the water content of the oil-water two-phase fluid.
When the main flow channel is closed (the self-adaptive adjusting mechanism is in the upper position), the flow area of the main flow channel is reduced to 0-95% of the initial flow area.
After the main flow channel is closed, if the water content of the oil-water two-phase fluid is reduced, the flow area of the main flow channel can be recovered.
Formation fluid flows from the annular space into the tubular body.
The self-adaptive adjusting mechanism can set the critical water content aiming at the reduction of the water content in the oil-water two-phase fluid, and the flowing main channel is completely opened when the water content is lower than the critical water content.
From the above, the self-adaptive inflow control device for the oil well control fluid, provided by the invention, is based on the Bernoulli principle and the stress balance principle, and can identify the type of the fluid and automatically adjust the resistance level of the device, when the water content is low, the resistance of the device to the fluid is small, the oil yield is not influenced, when the water content is increased, the resistance of the device is automatically adjusted, the water yield is limited, and the long-term stable yield of the oil well is ensured.
In the description of the present invention, it is to be understood that the positional indications or relationships are based on the positional or positional relationships shown in the drawings and are for the purpose of describing the invention only, and are not intended to indicate or imply that the device or element so referred to must have the particular orientation, be constructed and operated in the particular orientation, and are not to be construed as limiting the invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The self-adaptive oil well fluid control device comprises an oil pipe and an outer pipe, and is characterized by further comprising a self-adaptive adjusting mechanism, wherein the oil pipe is concentrically arranged in the outer pipe, an annular passage is formed between the oil pipe and the outer pipe, the outer pipe is provided with an outer pipe fluid inlet, the oil pipe is provided with a radial fluid control port, and the self-adaptive adjusting mechanism is installed at the radial fluid control port;
the self-adaptive adjusting mechanism comprises a shell and a fixing device, wherein the shell is fixed in the fixing device, the fixing device is fixed at a radial fluid control port in a sealing mode, the fixing device is provided with a main fluid channel which is axially communicated, the upper end of the fixing device is also provided with a fluid inlet of the fixing device, the fluid inlet of the fixing device is communicated with the middle of the main fluid channel, the shell is provided with a central cavity and an eccentric fluid control channel, the central cavity is equivalent to a piston cavity, a movable adjusting module is arranged in the central cavity and equivalent to a piston, the movable adjusting module is in sliding type sealing connection with the inner wall of the central cavity, the outer diameter of the upper half section of the movable adjusting module is smaller than the outer diameter of the lower half section of the movable adjusting module, the upper end of the fluid control channel is communicated with the main fluid channel, the lower end of the fluid control channel is communicated with the bottom of the central cavity of the shell, the lower end of the fixing device is provided with an outlet of the flow control channel, and the outlet of the flow control channel is communicated with the bottom of the central cavity of the shell.
2. The adaptive oil well fluid control device according to claim 1, wherein the outer pipe and the oil pipe are fixedly connected by a connecting device, the connecting device comprises a left concentric joint and a right concentric joint, the left concentric joint and the right concentric joint are of the same structure and are fixedly connected by bolts, the concentric joint or the right concentric joint comprises an outer ring, an inner ring and a middle ring, the middle ring is connected between the outer ring and the inner ring, the middle ring is provided with an axial through hole for communicating an annular channel between the oil pipe and the outer pipe, the outer pipe is connected with the outer pipe in a threaded manner, and the oil pipe is connected with the inner ring in a threaded manner.
3. The adaptive well fluid control device of claim 1 or 2, wherein the fluid control passageway is a serpentine tortuous passageway.
4. The adaptive oil well fluid control device according to claim 1 or 2, wherein the outer diameter of the upper half section of the movable adjusting module is smaller than that of the lower half section of the movable adjusting module, the lower half section of the movable adjusting module is connected with the outer wall of the central cavity in a sliding sealing mode, the upper port of the central cavity of the shell is provided with a necking ring in an integrated structure, and the inner diameter of the necking ring is larger than or equal to the outer diameter of the upper half section of the movable adjusting module and is smaller than the outer diameter of the lower half section of the movable adjusting module.
5. The adaptive well fluid control device of claim 4, wherein the height of the upper half of the movable adjustment module is greater than the thickness of the collar, but the sum of the thickness of the collar and the diameter of the main fluid passage is greater than the height of the upper half of the movable adjustment module.
6. The adaptive well fluid control device of claim 4, wherein the radially facing surface of the movable adjustment module is directly opposite the stationary device fluid inlet.
7. A fluid flow rate self-adaptive adjusting mechanism is characterized by comprising a shell and a fixing device, wherein the shell is fixed inside the fixing device, the fixing device is fixed at a radial fluid control port in a sealing mode, the fixing device is provided with a main fluid channel which is axially communicated, the upper end of the fixing device is also provided with a fluid inlet of the fixing device, the fluid inlet of the fixing device is communicated with the middle of the main fluid channel, the shell is provided with a central cavity and an eccentric fluid control channel, the central cavity is equivalent to a piston cavity, a movable adjusting module is installed in the central cavity and equivalent to a piston, the movable adjusting module is in sliding type sealing connection with the inner wall of the central cavity, the outer diameter of the upper half section of the movable adjusting module is smaller than that of the lower half section of the movable adjusting module, the upper end of the fluid control channel is communicated with the main fluid channel, the lower end of the fluid control channel is communicated with the bottom of the central cavity of the shell, the lower end of the fixing device is provided with an outlet of the flow control channel, the outlet of the flow control channel is communicated with the bottom of the central cavity of the shell, and the fluid control channel is a snake-shaped bent channel.
8. The adaptive fluid flow rate regulating mechanism as recited in claim 7, wherein the lower half of the movable regulating module is slidably and hermetically connected to the outer wall of the central cavity, a necking ring of an integrated structure is disposed at the upper port of the central cavity of the housing, the inner diameter of the necking ring is greater than or equal to the outer diameter of the upper half of the movable regulating module and smaller than the outer diameter of the lower half of the movable regulating module, the height of the upper half of the movable regulating module is greater than the thickness of the necking ring, but the sum of the thickness of the necking ring and the diameter of the main fluid channel is greater than the height of the upper half of the movable regulating module, and the radial end surface of the movable regulating module faces the fluid inlet of the fixed device.
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| AU2013405213A1 (en) * | 2013-11-14 | 2016-05-05 | Halliburton Energy Services, Inc. | Flow rings for regulating flow in autonomous inflow control device assemblies |
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