CN118292817A - Selective fluid controller, oil reservoir exploitation pipe column and oil reservoir exploitation system - Google Patents
Selective fluid controller, oil reservoir exploitation pipe column and oil reservoir exploitation system Download PDFInfo
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- CN118292817A CN118292817A CN202310008307.5A CN202310008307A CN118292817A CN 118292817 A CN118292817 A CN 118292817A CN 202310008307 A CN202310008307 A CN 202310008307A CN 118292817 A CN118292817 A CN 118292817A
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- 239000012530 fluid Substances 0.000 title claims abstract description 114
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910000531 Co alloy Inorganic materials 0.000 claims description 3
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 24
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 230000017488 activation-induced cell death of T cell Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 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
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Flow Control (AREA)
Abstract
The invention provides a selective fluid controller, an oil reservoir exploitation pipe column and an oil reservoir exploitation system, wherein the fluid controller comprises a main body, a main body and a control channel, wherein the main body is internally provided with a main channel and a control channel which are all used for communicating a stratum space and an inner space of the pipe column, the main channel is provided with an input cavity, the control channel is provided with a control cavity adjacent to the input cavity, an intermediate channel for communicating the input cavity and the control cavity is arranged between the input cavity and the control cavity, and a movable valve block is arranged in the intermediate channel; fluid respectively input through the main channel and the control channel can generate pressure difference between two end faces of the movable valve block, so that the movable valve block moves along a direction approaching to or separating from the cavity inlet to change the flow area in the input cavity. Based on the technical scheme of the invention, the type of fluid flowing into the pipe column and the flow rate thereof can be automatically identified and controlled according to different reservoir conditions and production requirements, and unnecessary water or gas can be partially blocked or completely blocked in a targeted manner, so that the recovery ratio can be effectively improved.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a selective fluid controller, an oil reservoir exploitation pipe column and an oil reservoir exploitation system.
Background
The development of water/gas cap reservoirs is of great significance for energy development, but as the development progresses, due to the reservoir heterogeneity of most reservoirs, early gas/water breakthrough results in high water/gas-oil ratio of many wells at the early stage of production, and these production challenges can lead to the fact that a large amount of oil in the reservoirs can be recovered and cannot be successfully recovered. Through research of scholars at home and abroad, factors influencing oil reservoir exploitation mainly comprise reasons such as heterogeneity of a reservoir, toe-heel effect, change of horizontal segment track and the like. In order to solve the problems, the research on the water control completion technology based on the balanced drainage idea is carried out from the last 80 th century, and water control devices such as ICD, AICD, ICV and the like are sequentially born after decades of research. However, these current water control devices are technically deficient to some extent through the use of feedback.
Early water control devices (ICDs) were of the nozzle, channel and orifice type, all of the general, passive type, with dimensions set prior to or during completion and no further adjustment was possible once put into production. In addition, ICD can only simply restrict the stratum liquid production speed of a shaft part, can not distinguish oil phase and water phase, and after oil well water is broken through, ICD can not reduce or prevent the influence of breakthrough. The self-adaptive well inflow control device (AICD) is a novel ICD developed on the basis of ICD technology, has fluid identification capability, and can automatically adjust flow resistance generated by the self-adaptive well inflow control device according to the change of fluid properties, composition and flow, so that the well inflow profile is effectively balanced, the phenomenon of bottom water coning is prevented, and long-term stable production of a horizontal well is ensured. However, the existing AICD still has the problems of low fluid identification precision, unstable performance, complex structure, high processing difficulty and the like. The ICV is an inflow control valve, and the flow entering a shaft is regulated mainly through a control valve which is remotely controlled, so that the flow of inflow fluid can be effectively controlled, but the problems that manual regulation is needed, the remote control is unstable and the like exist.
Therefore, a novel selective flow regulating device is urgently needed to solve the problems, not only can the stable structure be ensured, but also the installation is convenient, and the water and gas can be continuously and effectively controlled.
Disclosure of Invention
The invention provides a selective fluid controller, an oil reservoir exploitation pipe column and an oil reservoir exploitation system, which aim to solve the problems that various water control devices in the prior art cannot distinguish fluids, have poor fluid identification and need manual control.
In a first aspect, the present invention provides a selective fluid controller, including a main body, wherein a main channel and a control channel, both of which are used for communicating a stratum space and an inner space of a tubular column, are provided in the main channel, an input cavity is provided in the main channel, a control cavity adjacent to the input cavity is provided in the control channel, an intermediate channel for communicating the input cavity and the control cavity is provided between the input cavity and the control cavity, and a movable valve block is provided in the intermediate channel;
The first end face of one end of the movable valve block corresponds to a cavity inlet of the input cavity, the second end face of the other end corresponds to the control cavity, and the area of the second end face is larger than that of the first end face and/or the cavity inlet;
The inner diameter of the control channel meets the requirement that the flow form of the fluid entering the control channel is laminar, and the fluid input through the main channel and the control channel can generate pressure difference between the two end surfaces of the movable valve block, so that the movable valve block moves along the direction approaching to or separating from the cavity inlet to change the flow area in the input cavity.
In one embodiment, the projection of the first end face can completely cover the cavity entrance.
In one embodiment, a limiting protrusion is further arranged on the outer peripheral surface of the movable valve block near the first end surface, and the limiting protrusion can be abutted against the opening edge of the passage opening where the middle passage is communicated with the control cavity, so that the movable valve block is limited to completely enter the control cavity.
In one embodiment, the ratio of the diameter of the cavity inlet to the diameter of the second end face is in the range of 1:5 to 1:2.
In one embodiment, the control channel further comprises an extension tube section extending outwardly from the body, the extension tube section being a rigid or flexible tube structure.
In one embodiment, the control channel has an inner diameter of 1mm to 3mm.
In one embodiment, the control passage has a second passage outlet in communication with the interior space of the tubular string, the ratio of the inner diameter of the control passage to the diameter of the second passage outlet ranging from 2:1 to 4:1.
In one embodiment, the main channel and the control channel have a first channel inlet and a second channel inlet, respectively, capable of communicating with a formation space, at least the first channel inlet being conical.
In one embodiment, the angle of the apex angle of the cone corresponding to the first channel inlet is in the range of 90 ° to 120 °.
In one embodiment, the ratio of the diameter of the first passage inlet communicating with the formation space to the diameter of the second passage inlet communicating with the control passage and the formation space is in the range of 5:1 to 20:1.
In one embodiment, the main channel is provided with a plurality of first channel outlets capable of being communicated with the inner space of the tubular column, the plurality of first channel outlets are all communicated with the input cavity, the number of the first channel outlets is in the range of 6-8, and the ratio of the diameter of each first channel outlet to the diameter of the cavity inlet is in the range of 1:3-3:5.
In one embodiment, the movable valve block is made of nickel-based tungsten cobalt alloy, wherein the content of Co and Ni is 8-10%, the content of wc is 90-92%, and the balance is Fe, mn, ca, zn and Mg.
In one embodiment, the exterior of one end of the body has a threaded formation for mounting the body to a corresponding threaded mounting port on a tubular string.
In one embodiment, the main body comprises a base and a cover body which can be mutually buckled and installed, the base and the cover body can be relatively fixed through threads or pins, and the base and the cover body jointly enclose an inner cavity structure of the main body, which is composed of the input cavity, the control cavity and the middle channel.
In a second aspect, the oil reservoir exploitation pipe column provided by the invention comprises the selective fluid controller, and further has all technical effects.
In a third aspect, the oil reservoir exploitation system provided by the invention comprises the oil reservoir exploitation pipe column, and further has all technical effects.
The above-described features may be combined in various suitable ways or replaced by equivalent features as long as the object of the present invention can be achieved.
Compared with the prior art, the selective fluid controller, the oil reservoir exploitation pipe column and the oil reservoir exploitation system provided by the invention have the following beneficial effects:
The selective fluid controller, the oil reservoir exploitation pipe column and the oil reservoir exploitation system can spontaneously identify and control the type and the flow rate of fluid flowing into the pipe column according to different reservoir conditions and production requirements, and can pertinently block or completely block unnecessary water or gas, so that the recovery ratio can be effectively improved.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 shows a cross-sectional view of a fluid controller of the present invention (movable valve block open state);
FIG. 2 shows a cross-sectional view of the fluid controller of the present invention (movable valve block closed state);
Fig. 3 shows a bottom view of the fluid controller of the present invention.
In the drawings, like parts are designated with like reference numerals. The figures are not to scale.
Reference numerals:
1-main body, 11-cover, 12-base, 2-main channel, 21-first channel inlet, 22-first channel outlet, 23-input cavity, 231-cavity inlet, 3-control channel, 31-second channel inlet, 32-second channel outlet, 33-control cavity, 34-extension pipe section, 4-movable valve block, 41-limit protrusion, 5-intermediate channel.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Example 1
The embodiment of the invention provides a selective fluid controller, which comprises a main body 1, wherein a main channel 2 and a control channel 3 which are all used for communicating a stratum space and a tubular column inner space are arranged in the main body 1, an input cavity 23 is arranged on the main channel 2, a control cavity 33 adjacent to the input cavity 23 is arranged on the control channel 3, an intermediate channel 5 which is used for communicating the input cavity 23 and the control cavity 33 is arranged between the input cavity 23 and the control cavity 33, and a movable valve block 4 is arranged in the intermediate channel 5;
The first end face of one end of the movable valve block 4 corresponds to the cavity inlet 231 of the input cavity 23, the second end face of the other end corresponds to the control cavity 33, and the area of the second end face is larger than that of the first end face and/or the cavity inlet 231;
the inner diameter of the control channel 3 satisfies that the flow pattern of the fluid entering therein is laminar, and the fluid input through the main channel 2 and the control channel 3, respectively, can generate a pressure difference between both end surfaces of the movable valve block 4, so that the movable valve block 4 moves in a direction approaching or separating from the cavity inlet 231 to change the size of the flow area in the input cavity 23.
Preferably, the projection of the first end surface can completely cover the cavity inlet 231, so that in an extreme state, the first end surface of the movable valve block 4 can be directly attached to the cavity wall where the cavity inlet 231 is located and completely block the cavity inlet 231, thereby blocking the main channel 2.
In particular, as shown in fig. 1 of the drawings, the selective fluid controller of the present invention is functionally equivalent to a selective control valve, and is mainly used for identifying fluids and then controlling the inflow rate of corresponding types of fluids into a pipe string. Two channels, namely a main channel 2 and a control channel 3, are formed on the main body 1 of the fluid controller, and can be used for allowing fluid to flow from stratum to the tubular column structurally; functionally, however, the main channel 2 serves as the primary flow path for the fluid, and the control channel 3 serves as a branch in parallel with the main channel 2 for controlling the flow area of the main channel 2 in accordance with the type of fluid entering therein, so that the flow rate of the control channel 3 is small, typically not exceeding 20% of the total flow rate.
The main channel 2 is provided with an input cavity 23 on the flow path, the control channel 3 is provided with a control cavity 33 on the flow path, an intermediate channel 5 is communicated between the input cavity 23 and the control cavity 33, and a movable valve block 4 capable of moving along the axial direction of the intermediate channel 5 is arranged in the intermediate channel 5. Thus, the control of the flow area of the main channel 2 is realized by controlling the movement of the movable valve block 4, and the degree of the movable valve block 4 entering the input cavity 23 from the middle channel 5 is changed; the greater the degree of entry, the greater the area of shielding of the movable valve block 4 from the flow area in the input chamber 23, so that the flow area of the main channel 2 is smaller and the flow rate of the corresponding fluid is smaller; the smaller the extent of the entry, the smaller the area of the movable valve block 4 that is blocked from the flow area in the inlet chamber 23, and thus the larger the flow area of the main channel 2, the larger the flow of the corresponding fluid. The control of the movable valve block 4 is realized by the difference between the pressures of the fluid in the main channel 2 and the control channel 3 acting on the two end surfaces of the movable valve block 4.
Specifically, when the fluid with a certain pressure in the stratum is shunted to the main channel 2 and the control channel 3 for circulation, due to the structural design of the control channel 3, the fluid can generate pressure drops with different degrees due to the physical properties of the fluid and the flowing form in the control channel 3, so that the fluid in the control channel 3 enters the control cavity 33 after a certain pressure drop process, and a certain difference exists between the pressure of the fluid in the control channel 3 and the pressure of the fluid in the main channel 2 in the input cavity 23, and meanwhile, the first end face and the second end face of the movable valve block 4 are combined with the area design of the cavity inlet 231 of the input cavity 23, so that the pressure difference exists between the first end face and the second end face of the movable valve block 4, and the pressure difference is used as power for driving the movable valve block 4 to move. As shown in fig. 1 of the drawings, the pressure F 1 applied to the first end surface of the movable valve block 4 may be represented as P 1*A1, the pressure F 2 applied to the second end surface of the movable valve block 4 may be represented as (P 1-△P)*A2, Δp is the pressure drop generated by the fluid passing through the second passage, where a 1 and a 2 are corresponding areas of force, and according to a specific structural design, for example, a hydraulic cylinder type structure, a 1 and a 2 may be the areas of the first end surface and the second end surface, or may be the corresponding actual areas of force.
The principle of the pressure drop of the fluid in the control channel 3 is that the change of the hydrostatic pressure between two flow sections in the flow channel comprises the along-path friction pressure drop, the gravity pressure drop, the acceleration pressure drop, the local shape resistance pressure drop and the like; wherein the fluid viscosity μ (in pa·s) and the pressure loss satisfy the hasroot-poiseuille law for laminar flow in a circular tube. Because of the large viscosity difference between different fluids (hydrocarbon and water) in the reservoir, when the fluids do laminar flow movement inside the control channel 3, the fluid with larger viscosity will generate a larger pressure drop (pressure drop), while the fluid with smaller viscosity will generate a smaller pressure change. For example, oil is a high viscosity fluid for water and gas. Based on the self property of circulation and the principle of pressure drop generated by the flowing form in the flowing process, the fluid can be identified, the fluid is distinguished by utilizing different pressure drop degrees, the flowing area is controlled, and the purpose of controlling the flow of a certain fluid is finally achieved.
In this embodiment, the type of fluid is exemplified by oil, as shown in fig. 1 of the accompanying drawings, the oil in the stratum enters the main channel 2 and the control channel 3 respectively, wherein the pressure drop is not obvious because the main channel 2 has larger inner diameter and shorter path; the control channel 3 has a smaller inner diameter and a longer path, so that the oil therein has a larger pressure drop due to a larger viscosity, and thus only gives a smaller upward pressure to the movable valve block 4. At the movable valve block 4, the pressure F 1＝P1*A1 of the fluid in the main channel 2 acting on its first end face, the pressure F 2＝(P1-△P)*A2 of the fluid in the control channel 3 acting on its second end face, although a 2＞A1, the frictional pressure drop is controlled by the structural design and parameter control of the control channel 3, for example by the flow pattern affected by the diameter and the roughness of the channel wall, the gravitational pressure drop is controlled by the specific arrangement, orientation of the control channel 3, and other factors controlling the acceleration pressure drop and the local shape resistance pressure drop, so that the pressure drop amplitude (magnitude of Δp) eventually satisfies F 1＞F2. This creates a thrust on the movable valve block 4 on its first end face, which causes the movable valve block 4 to move away from the input chamber 23 to the condition shown in figure 1 of the drawings, and the movable valve block 4 is in a position close to the control chamber 33, so that the main passage 2 is opened and oil can normally enter the string from the formation.
Preferably, the ratio of the diameter of the cavity inlet 231 to the diameter of the second end surface ranges from 1:5 to 1:2, which substantially affects the area ratio of a 1 to a 2 in the above formula, which can also be expressed as the ratio of a 1 (the area of the cavity inlet 231) to a 2 (the area of the second end surface), mainly to ensure that the pressure difference generated at the movable valve block 4 can drive the movable valve block 4 to move.
Further, a limiting protrusion 41 is further disposed on the outer peripheral surface of the movable valve block 4 near the first end surface, and the limiting protrusion 41 can abut against the opening edge of the passage opening of the intermediate passage 5 communicating with the control chamber 33, so as to limit the movable valve block 4 from completely entering the control chamber 33.
Specifically, as shown in fig.1 and 2 of the accompanying drawings, the movable valve block 4 is in limit fit with the edge of the channel opening at one end of the middle channel 5 by means of the limit protrusion 41, so that the movable valve block 4 is limited to completely enter the control cavity 33, and therefore, in the state shown in fig.1 of the accompanying drawings, a minimum space with a certain size can be kept in the control cavity 33, and therefore, the fluid in the control channel 3 can always normally enter the control cavity 33 and exert pressure on the movable valve block 4.
Further, the control channel 3 further comprises an extension tube section 34 extending outwards from the main body 1, wherein the extension tube section 34 is of a rigid or flexible tube structure.
In particular, referring to fig. 1 of the drawings, the configuration of the extension tube section 34 is merely illustrative, and may be designed as a rigid tube structure of a fixed shape according to the structure of the tube column, or as a flexible tube structure which may be wound around the structure of the tube column. The purpose of the extension tube section 34 is to extend the length of the control channel 3 as much as possible without changing the size of the body 1, so that a more pronounced pressure drop effect can be obtained. Referring to the structure and orientation shown in fig. 1 of the drawings, the main body 1 of this embodiment is sized to have a height of about 15-20mm, a diameter of the first end face of 12-16mm, and a diameter of the second end face of 4-8mm, and is very compact in whole.
Preferably, the control channel 3 has an inner diameter of 1mm-3mm. To ensure that the fluid in the control channel 3 is in a laminar flow state, the Reynolds number Re is not higher than a critical value Recr (smaller than 2300), and the diameter of the control channel 3 is restricted to be 1mm-3mm according to the type and the flow rate of the downhole fluid and considering capillary flow (preventing blockage and water lock).
Further, the control channel 3 has a second channel outlet 32 communicating with the inner space of the tubular string, so that in order to ensure that the pressure F 2 on the second end face of the movable valve block is less affected by the pressure in the tubular string, the relative size of the second channel outlet 32 needs to be reduced as much as possible, so that the ratio of the inner diameter of the control channel 3 to the diameter of the second channel outlet 32 is designed to be in the range of 2:1-4:1.
Further, the main channel 2 and the control channel 3 have a first channel inlet 21 and a second channel inlet 31, respectively, which are capable of communicating with the formation space, at least the first channel inlet 21 being conical.
In particular, at least the first channel inlet 21 is designed as a conical structure with an inclination angle, so that the fluid is able to form a vortex when flowing in. For fluids with relatively high viscosity (such as oil in an oil well), the additional resistance to rotation is high, so that the flow rate of the fluid in the part is low and the circulation is good. For fluids with smaller viscosity (such as water and gas in an oil well), the additional resistance born by the fluids during rotation is small, so that the flow velocity of the fluids in the part is large, the circulation is poor, and the effect of auxiliary water control and oil stabilization is realized.
Preferably, to ensure the variability of the formation of different types of fluids, the angle of the apex angle of the cone corresponding to the first channel inlet 21 is in the range of 90 ° -120 ° with optimum results.
Further, it is ensured that the flow of fluid from the main channel 2 into the pipe string can be restricted to the greatest extent when the movable valve block 4 is in the closed state, and the flow of fluid from the main channel 2 can be increased to the greatest extent when the movable valve block 4 is in the open state, and the ratio of the diameter of the first channel inlet 21, through which the main channel 2 communicates with the formation space, to the diameter of the second channel inlet 31, through which the control channel 3 communicates with the formation space, is in the range of 5:1-20:1, i.e. the first channel inlet 21 of the main channel 2 can be as large as possible.
Further, the main channel 2 is provided with a plurality of first channel outlets 22 capable of being communicated with the inner space of the tubular column, the plurality of first channel outlets 22 are all communicated with the input cavity 23, the number of the first channel outlets 22 is in the range of 6-8, and the ratio of the diameter of the single first channel outlet 22 to the diameter of the cavity inlet 231 is in the range of 1:3-3:5.
Specifically, the number of the first passage outlets 22 of the passage for communicating the stratum and the tubular column is as large as possible without affecting the operation of the control passage 3, so as to ensure the maximum oil passing area. However, due to the limitation of the area of the first channel inlets 21, the flow of the first channel outlets 22 will not be affected after a certain number of first channel outlets 22 are reached, so the number of the first channel outlets 22 is 6-8, the layout structure is as shown in fig. 3, and the ratio of the diameter of the single first channel outlet 22 to the diameter of the cavity inlet 231 is 1:3-3:5.
Further, the movable valve block 4 is made of nickel-based tungsten-cobalt alloy, so as to increase the anti-impact damage capability and the resistance to corrosion of hydrogen sulfide and carbon dioxide, and has the density of 14.5-14.75, the Rockwell hardness of 90.5-91 and the bending strength of >2500N/mm 2. Wherein the content of each component is 8-10% of Co and Ni, 90-92% of wc and Fe, mn, ca, zn% of Mg.
Further, the exterior of one end of the body 1 has a threaded structure for mounting the body 1 to a corresponding threaded mounting port on a pipe string.
Further, the main body 1 includes a base 12 and a cover 11 that can be fastened to each other, the base 12 and the cover 11 can be fixed relatively by threads or pins, and the base 12 and the cover 11 together enclose an inner cavity structure of the main body 1 formed by the input cavity 23, the control cavity 33, and the intermediate channel 5.
Specifically, as shown in fig. 1 of the accompanying drawings, the cover 11 has a boss protruding toward the base 12, the base 12 has a mounting groove matched with the boss, and the boss of the cover 11 is matched into the mounting groove of the base 12 to realize the buckling of the two. In addition, the boss and the mounting groove can be matched through threads or pins so as to fix the boss and the mounting groove.
Example two
The present embodiment mainly explains the control principle of the fluid controller of the present invention for fluids with smaller viscosity, and reference may be made to the first embodiment for some of the same content, which is not repeated herein.
The embodiment of the invention provides a selective fluid controller, which comprises a main body 1, wherein a main channel 2 and a control channel 3 which are all used for communicating a stratum space and a tubular column inner space are arranged in the main body 1, an input cavity 23 is arranged on the main channel 2, a control cavity 33 adjacent to the input cavity 23 is arranged on the control channel 3, an intermediate channel 5 which is used for communicating the input cavity 23 and the control cavity 33 is arranged between the input cavity 23 and the control cavity 33, and a movable valve block 4 is arranged in the intermediate channel 5;
The first end face of one end of the movable valve block 4 corresponds to the cavity inlet 231 of the input cavity 23, the second end face of the other end corresponds to the control cavity 33, and the area of the second end face is larger than that of the first end face and/or the cavity inlet 231;
the inner diameter of the control channel 3 satisfies that the flow pattern of the fluid entering therein is laminar, and the fluid input through the main channel 2 and the control channel 3, respectively, can generate a pressure difference between both end surfaces of the movable valve block 4, so that the movable valve block 4 moves in a direction approaching or separating from the cavity inlet 231 to change the size of the flow area in the input cavity 23.
Preferably, the projection of the first end face can completely cover the cavity entrance 231.
Specifically, when a less viscous fluid (e.g., water or gas) in the formation enters the controller, the fluid enters the main passage 2 and the control passage 3 simultaneously. Because of the small viscosity, the fluid will have a small or negligible pressure drop in the control channel 3, which will cause a large upward pressure in the control chamber 33 on the first end face below the movable valve block 4, and according to the pressure calculation, the pressure F 1＝P1*A1 of the fluid in the main channel 2 on the first end face thereof, and the pressure F 2＝(P1-△P)*A2 of the fluid in the control channel 3 on the second end face thereof, where the Δp value is small or directly negligible, and in the extreme case where Δp is directly negligible, F 2＝P1*A2, F 2＞F1 due to a 2＞A1, will be forced upward to move the movable valve block 4 in the direction into the input chamber 23 to the state of covering the chamber inlet 231, as shown in fig. 2 of the drawings. At this time, the movable valve block 4 directly blocks the fluid from entering the main channel 2, and thus the fluid blocking control for the non-oil is realized.
It should be noted that, in the above extreme case, the movable valve block 4 may directly block the fluid from entering the main channel 2. According to practical situations, the fluids in the stratum are generally mixed fluids, but the proportion of oil, gas and water is different, so that in most situations, the proportion of water and gas in the fluids is large, the proportion of oil is small, the DeltaP value is small, and in the final F 2＞F1 situation, the influence of other factors on or the movement of the movable valve block 4 needs to be considered, such as the resistance of the movement of the movable valve block 4 and the kinetic energy influence of the fluid entering the input cavity 23, so that the movable valve block 4 can not completely seal the cavity inlet 231 in some situations, but the flow area of the input cavity 23 can also be greatly reduced, the flow rate and proportion of the water entering the production string are greatly reduced, and the recovery ratio is improved.
Therefore, the pressure applied to the opposite ends of the movable valve block 4 can change along with the change of the fluid type and the proportion of each component of the fluid, so that the movable valve block 4 can automatically and real-timely adjust the position of the movable valve block according to the corresponding circulation, and can dynamically regulate and control the flow of the flowing fluid, thereby realizing the purpose of controlling the flow based on the identification of the fluid and further solving the problem of controlling water/gas during reservoir exploitation.
In addition, according to the data acquired in the application process, the following relational expression is obtained through a simulation analysis regression equation:
△P＝0.0248μ3–13.712μ2+2638.3μ–76844
Where ΔP represents the difference in pressure experienced by the upper and lower faces of the movable valve block 4 and μ represents the viscosity of the fluid (μ being smaller as the gas/water content is higher in the fluid).
According to the equation, when the fluid viscosity drops to 40pa·s, the movable valve block 4 will start to move upward and close the channel further as the fluid viscosity drops.
Example III
The embodiment of the invention provides an oil reservoir exploitation pipe column which comprises the selective fluid controller and further has all technical effects. The wall surface of the production string is provided with a mounting opening, the fluid controller is mounted in the mounting opening, and the trunk channel 2 and the control channel 3 of the fluid controller are communicated with the inner space and the outer space of the production string.
Example IV
The embodiment of the invention provides an oil reservoir exploitation system, which comprises the oil reservoir exploitation pipe column and further has all technical effects. The reservoir production system also includes uphole equipment connected to the production string, as well as some other equipment.
In the description of the present invention, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," "right," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (16)
1. The selective fluid controller is characterized by comprising a main body, wherein a main channel and a control channel which are used for communicating a stratum space and a tubular column inner space are arranged in the main body, an input cavity is arranged on the main channel, a control cavity adjacent to the input cavity is arranged on the control channel, an intermediate channel which is used for communicating the input cavity and the control cavity is arranged between the input cavity and the control cavity, and a movable valve block is arranged in the intermediate channel;
The first end face of one end of the movable valve block corresponds to a cavity inlet of the input cavity, the second end face of the other end corresponds to the control cavity, and the area of the second end face is larger than that of the first end face and/or the cavity inlet;
The inner diameter of the control channel meets the requirement that the flow form of the fluid entering the control channel is laminar, and the fluid input through the main channel and the control channel can generate pressure difference between the two end surfaces of the movable valve block, so that the movable valve block moves along the direction approaching to or separating from the cavity inlet to change the flow area in the input cavity.
2. The selective fluid controller of claim 1, wherein the projection of the first end face is configured to completely cover the cavity inlet.
3. The selective fluid controller of claim 1, wherein a limiting protrusion is further disposed on the outer peripheral surface of the movable valve block near the first end surface, and the limiting protrusion can abut against a port edge of a port where the intermediate channel communicates with the control chamber, so as to limit the movable valve block from completely entering the control chamber.
4. The selective fluid controller of claim 1, wherein a ratio of a diameter of the cavity inlet to a diameter of the second end face is in a range of 1:5-1:2.
5. The selective fluid controller of claim 1, wherein the control channel further comprises an extension tube segment extending outwardly from the body, the extension tube segment being a rigid tubing structure or a flexible tubing structure.
6. The selective fluid controller of claim 1 or 5, wherein the control channel has an inner diameter of 1mm-3mm.
7. The selective fluid controller of claim 1 or 5, wherein the control passage has a second passage outlet in communication with the interior space of the tubular string, the ratio of the inner diameter of the control passage to the diameter of the second passage outlet ranging from 2:1 to 4:1.
8. The selective fluid controller of claim 1, wherein the main passage and the control passage have a first passage inlet and a second passage inlet, respectively, capable of communicating with a formation space, at least the first passage inlet being conical.
9. The selective fluid controller of claim 8, wherein the angle of the apex angle of the cone corresponding to the first channel inlet is in the range of 90 ° -120 °.
10. The selective fluid controller of claim 1 or 8, wherein a ratio of a diameter of a first passage inlet communicating with the main passage and the formation space to a diameter of a second passage inlet communicating with the control passage and the formation space is in the range of 5:1-20:1.
11. The selective fluid controller of claim 1, wherein the main channel has a plurality of first channel outlets capable of communicating with the interior space of the tubular string, the plurality of first channel outlets each communicating with the input chamber, the number of first channel outlets ranging from 6 to 8, and the ratio of the diameter of a single first channel outlet to the diameter of the chamber inlet ranging from 1:3 to 3:5.
12. The selective fluid controller of claim 1, wherein the movable valve block is a nickel-based tungsten-cobalt alloy having a Co and Ni content of 8-10%, wc content of 90-92%, and balance Fe, mn, ca, zn and Mg.
13. The selective fluid controller of claim 1, wherein an exterior of one end of the body has a threaded configuration for mounting the body to a corresponding threaded mounting port on a tubular string.
14. The selective fluid controller of claim 1, wherein the body comprises a base and a cover that are capable of being snap-fit to each other, the base and the cover being relatively fixable by threads or pins, the base and the cover collectively enclosing an internal cavity structure of the body comprised of the input chamber, the control chamber, and the intermediate channel.
15. A reservoir production string comprising the selective fluid controller of any one of claims 1 to 14.
16. A reservoir production system comprising the reservoir production tubing string of claim 15.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310008307.5A CN118292817A (en) | 2023-01-04 | 2023-01-04 | Selective fluid controller, oil reservoir exploitation pipe column and oil reservoir exploitation system |
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| CN202310008307.5A CN118292817A (en) | 2023-01-04 | 2023-01-04 | Selective fluid controller, oil reservoir exploitation pipe column and oil reservoir exploitation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120159364A (en) * | 2024-10-21 | 2025-06-17 | 西南石油大学 | Automatic water control device based on fluid density difference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120159364A (en) * | 2024-10-21 | 2025-06-17 | 西南石油大学 | Automatic water control device based on fluid density difference |
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