CN105626003A - Control device used for regulating formation fluid - Google Patents

Control device used for regulating formation fluid Download PDF

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Publication number
CN105626003A
CN105626003A CN201410645373.4A CN201410645373A CN105626003A CN 105626003 A CN105626003 A CN 105626003A CN 201410645373 A CN201410645373 A CN 201410645373A CN 105626003 A CN105626003 A CN 105626003A
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CN
China
Prior art keywords
described
vortex chamber
control device
formation fluid
device according
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CN201410645373.4A
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Chinese (zh)
Inventor
赵旭
侯倩
张同义
岳慧
姚志良
段友智
付道明
翟羽佳
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中国石油化工股份有限公司
中国石油化工股份有限公司石油工程技术研究院
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Priority to CN201410645373.4A priority Critical patent/CN105626003A/en
Publication of CN105626003A publication Critical patent/CN105626003A/en

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Abstract

The invention discloses a control device used for regulating formation fluid. The control device comprises throttling parts. Each throttling part comprises a platelike body, a rotational flow cavity, an inlet channel and a throttling hole, wherein the rotational flow cavity is formed in the platelike body, the inlet channel is used for receiving the formation fluid and enabling the formation fluid to flow into the rotational flow cavity, the throttling hole is formed in the middle of the rotational flow cavity, and the inlet channel and the rotational flow cavity are constructed to make the formation fluid enter the rotational flow cavity along the side wall of the rotational flow cavity and be discharged out through the throttling hole. The throttling parts do not independently require the throttling holes to make the formation fluid generate the throttling pressure drop any more so that the hole diameter of the throttling holes can be arranged to be larger, and therefore the possibility of blockage is decreased. Accordingly, the hole diameter of the throttling holes can be arranged to be larger, and thus the possibility of blockage is decreased. In addition, the throttling pressure drop of water is larger than the throttling pressure drop of oil in the rotational flow process, and therefore the purpose of water control can be effectively achieved.

Description

A kind of control device for adjustably layer fluid

Technical field

The present invention relates to a kind of oil recovery and control device, particularly a kind of control device for adjustably layer fluid.

Background technology

Oil extraction system typically requires and controls the inflow velocity of formation fluid by the device that controls for adjustably layer fluid, with satisfied production needs. At present, through frequently with one of which control device be nozzle type control device. Its concrete operation principle is: by allowing fluid flow several throttle orifices pre-setting physical dimension, and produces choke pressure drop by the throttling action of throttle orifice when being allowed fluid flow, thus reaching the purpose of water and oil control. But, when utilizing throttle orifice to produce choke pressure drop, it is necessary to very little by the diameter design of throttle orifice, it is likely in some cases need less than 1.5mm. So, when fluid carries solid impurity (such as, gravel), it is easy to make throttle orifice block.

Therefore, how to solve the problem that throttle orifice is easily blocked, be those skilled in the art's technical issues that need to address.

Summary of the invention

For the problems referred to above, the present invention proposes a kind of control device for adjustably layer fluid, it is possible to efficiently reduce the probability that throttle orifice is blocked.

The control device for adjustably layer fluid of the present invention, including throttling element, described throttling element includes plate-like body, is arranged on the vortex chamber of described plate-like body, for accepting formation fluid and enabling its flow into the access road of described vortex chamber, and it is located at the throttle orifice at the middle part of described vortex chamber, wherein, described access road and described vortex chamber are configured so that formation fluid enters described vortex chamber along the sidewall of described vortex chamber, and discharge through described throttle orifice.

When formation fluid is in the process of eddy flow to throttle orifice, the flow velocity of formation fluid can be gradually increased. And after local layer fluid flows out throttle orifice, the flow velocity of formation fluid can be greatly reduced, so that formation fluid can produce choke pressure drop after flowing out throttling element. So, do not need to make formation fluid produce choke pressure drop separately through throttle orifice again such that it is able to arrange larger by the aperture of throttle orifice, and then reduce blocked probability. Additionally, due to the aperture of the throttle orifice of the present invention can arrange more relatively large relative to the aperture of throttle orifice of the prior art, therefore when producing identical choke pressure drop, this control device has bigger area of passage. And, in the eddy flow process of formation fluid, it is possible to driving solid impurity motion, therefore this control device also has good self-cleaning function. Further, since the oil viscosity in formation fluid is big, density is little, and the viscosity of the water in formation fluid is little, density big, and therefore in the process of eddy flow, the choke pressure drop of water is more than the choke pressure drop of oil, such that it is able to more effectively realize the purpose of water and oil control.

In one embodiment, described access road includes the reducing section that cross section is gradually reduced along the flow direction of formation fluid, and respectively with described reducing section and described vortex chamber connects and cross section is constant Connectivity Section. So, simple in construction; It is easy to processing; Being provided with reducing section can first make formation fluid after undergauge accelerates, and enters back in vortex chamber, thus improving choke pressure drop further; And inflow direction when being easy to the adjustably layer fluid inflow vortex chamber of the direction by arranging Connectivity Section.

In one embodiment, described Connectivity Section is configured to extend along the tangential direction of described vortex chamber, and the sidewall of described Connectivity Section sidewall and described vortex chamber is smoothly connected. So, formation fluid flows into vortex chamber along the tangential direction of vortex chamber, such that it is able to reduce collision and the friction of formation fluid and vortex chamber, and then improves the choke pressure drop of throttling element further.

In one embodiment, the maximum cross section area of described reducing section is 4-5:1 with the ratio of the cross-sectional area of described Connectivity Section. As such, it is possible to improve further the formation fluid choke pressure drop when vortex chamber flow, thus improving uniformly controlling liquid, suppress the high section of oozing production fluid, promote hypotonic section of production fluid, promote the control action of the uniform lifting of bottom water oil mining early stage.

In one embodiment, described vortex chamber is circular, and described throttle orifice is positioned at the center of circle of described vortex chamber. So arrange, simple in construction, it is simple to processing, but also formation fluid can be made effectively to go to throttle orifice in vortex chamber inward turning.

In one embodiment, the circumference along described vortex chamber is evenly provided with at least two access road, so that formation fluid is capable of relatively stable eddy flow, thus improving choke pressure drop further.

In one embodiment, also including for accepting the base tube of the formation fluid of outflow from described throttling element, wherein, described throttling element is arranged on the outside of described base tube, and described base tube is provided with for making formation fluid flow into the pod apertures of described throttling element from stratum. Owing to formation fluid flow regime in the earth formation has turbulent flow, laminar flow, in some instances it may even be possible to little whirlpool etc. occurs. So it is unfavorable for that formation fluid forms eddy flow in vortex chamber. Therefore, before formation fluid flows into throttling element, first adopt pod apertures that formation fluid carries out a rectification, thus improving the choke pressure drop that throttling element can produce further. And pod apertures also acts as the effect controlling flow, to improve the discharge uniformity entered in throttling element.

In one embodiment, it is circumferentially with multiple being spaced and the holding tank of corresponding different pod apertures along described base tube, wherein, each described holding tank is respectively equipped with a throttling element, and the formation fluid that described holding tank is configured to from described pod apertures flows out flows into described throttling element through described holding tank. In actual Oil Field is applied, can control to install in device throttling element 1-4 according to electrical measurement result at one.

In one embodiment, the diapire of described vortex chamber and the diapire of described access road are in same plane, to improve stability during formation fluid eddy flow, such that it is able to improve the choke pressure drop of formation fluid further.

In one embodiment, formation fluid is oil, water or oil water mixture. Due to this control device apply in oil recovery process maximum, therefore preferentially selecting the formation fluid that this control device regulates is oil, water or oil water mixture.

In one embodiment, the roughness of the diapire of the diapire of described vortex chamber and described access road is all at below 0.0032mm, in order to fluid acceleration in vortex chamber rotates, thus improving the choke pressure drop to formation fluid further.

In one embodiment, the diameter of described throttle orifice is 3-6mm, the probability blocked to reduce throttle orifice.

In one embodiment, the height of described vortex chamber is 2.4-5.0mm, and diameter is 18-32mm, so that formation fluid can form eddy flow preferably in vortex chamber, thus improving the water and oil control function of vortex chamber further.

In one embodiment, the diameter of described pod apertures is 3-6mm, the probability blocked to reduce pod apertures.

In one embodiment, also including the overcoat being set in the outside of described base tube, wherein said throttling element is arranged between described base tube and described overcoat. As such, it is possible to by overcoat protection throttling element and base tube, such that it is able to extend the service life of base tube and throttling element.

Accompanying drawing explanation

Based on embodiment reference accompanying drawing, the present invention will be described in more detail hereinafter. In the drawings:

Fig. 1 is the structural representation controlling device for adjustably layer fluid of the present invention.

Fig. 2 is the structural representation of the base tube in the present invention.

Fig. 3 is the partial schematic diagram in the A portion in Fig. 2.

Fig. 4 is the structural representation of the throttling element in the present invention.

In the accompanying drawings, identical parts use identical accompanying drawing labelling. Accompanying drawing is not according to actual scaling.

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described.

As it is shown in figure 1, the device that controls for adjustably layer fluid of the present invention includes base tube 1, is set in the overcoat 2 outside base tube 1, and the throttling element 3 between base tube 1 and overcoat 2. Base tube 1 offers the through hole running through its tube wall. Local laminar fluid flow is after throttling element 3, then flows into the inside of base tube 1 from the through hole of base tube 1.

In a specific embodiment, one end of overcoat 2 is provided with female thread, in the outside of base tube 1 and be provided with external screw thread on the position at middle part. Overcoat 2 is spun on base tube 1 by screw thread, and is tightly connected by sealing ring 4. And when being set on base tube 1 by overcoat 2, the outer wall of base tube 1 abuts with the inwall of overcoat 2.

More specifically, as in figure 2 it is shown, the wall thickness being positioned at the part of screw thread both sides on base tube 1 is different. Wherein, the tube wall of the outside being positioned at overcoat 2 is relatively thin, and the tube wall being positioned at the inside of overcoat 2 is thicker, in order to arrange throttling element 3. And it is provided with ladder platform between the pipeline section that two wall thickness are different on base tube 1, is provided with corresponding ladder platform in the inside of overcoat 2. When overcoat 2 is fixed on base tube 1, positioned and fixed by the ladder platform being separately positioned on overcoat 2 and base tube 1, to improve the fastness of overcoat 2. Sealing ring 4 for hermetically sealed case 2 and base tube 1 may be located at the position of ladder platform.

The holding tank 11 for holding throttling element 3 is offered in the outside of base tube 1, and the part that this holding tank 11 tube wall of being positioned at base tube 1 is thicker. Time in the holding tank 11 that throttling element 3 is put into base tube 1, the roof of throttling element 3 is concordant with the outer wall of base tube 1. So, when being set on base tube 1 by overcoat 2, the roof of throttling element 3 abuts with the inwall of overcoat 2, is stuck in the holding tank 11 of base tube 1 thereby through overcoat 2 by throttling element 3, to prevent throttling element 3 from rocking or dropping. And, after the inwall of overcoat 2 abuts with the roof of throttling element 3, it is also possible to be effectively prevented formation fluid and flow into throttling element 3 from the roof of throttling element 3. Certainly, throttling element 3 can also be fixed in the holding tank 11 of base tube 1 by the mode welded, to improve the steadiness of throttling element 3 further.

Additionally, be provided with on the tube wall of base tube 1 along its axially extended pod apertures 12 (as shown in Figure 3). One end of pod apertures 12 connects with throttling element 3, and the other end runs through base tube 1. Formation fluid first passes through pod apertures 12, then flows in throttling element 3 again.

It is further preferable that be provided with multiple pod apertures 12 along the circumferentially-spaced of base tube 1, it also is provided with multiple holding tank 11 simultaneously. The pod apertures 12 that each holding tank 11 is corresponding different, i.e. each holding tank 11 connects from different pod apertures 12. And a throttling element 3 is set in each holding tank 11. In one example, when being provided with 4 throttling elements 3 on base tube 1, along 12 pod apertures 12 that are circumferentially provided with of base tube 1, corresponding three the different pod apertures 12 of each holding tank 11.

When being provided with multiple pod apertures 12, it is possible to make whole pod apertures 12 be in conducting state. When the number of pod apertures 12 is more, it is also possible to block part pod apertures 12 so that it is be in blocking state. The diameter of pod apertures 12 is preferably 3-6mm, to prevent solid impurity from blocking pod apertures 12. Furthermore it is also possible to arrange mozzle in pod apertures 12, formation fluid is flowed in throttling element 3 by mozzle. As such, it is possible to carry out the flow channel of adjustably layer fluid by regulating the length of mozzle.

More specifically, holding tank 11 is set to step trough. Throttling element 3 is placed on the groove part that the degree of depth of step trough is deeper. The formation fluid flowed out from pod apertures 12 first imports the groove part that the degree of depth of step trough is shallower, then flows in throttling element 3 from step trough again. So, simple in construction, it is simple to processing pod apertures 12, also allows for the pod apertures 12 making each holding tank 11 corresponding different, thus improving the discharge uniformity flowing into each throttling element 3 simultaneously.

When arranging multiple throttling element 3 on base tube 1, the adjacent throttle orifice 33 on two throttling elements 3 is along the setting that axially offsets one from another of base tube 1. As such, it is possible to make the stress point of base tube 1 on different cross sections, thus improving the service life of base tube 1.

It is of course also possible to make to leave between overcoat 2 and base tube 1 gap, formation fluid is flowed in throttling element 3 by the gap between overcoat 2 and base tube 1, etc.

Additionally, as shown in Figure 4, throttling element 3 includes plate-like body 34, the vortex chamber 31 that is arranged in plate-like body 34, the throttle orifice 33 at middle part that is positioned at vortex chamber 31, and is arranged on the access road 32 in plate-like body 34. Plate-like body 34 can be tabular. Now, the inwall of overcoat 2 is it can also be provided that one for holding the groove of plate-like body 34, so that plate-like body 34 can be fitted with the inwall of overcoat 2. More specifically, plate-like body 34 is rectangular slab, in order to processing and manufacture.

Certainly, throttling element 3 can also be fixed in the holding tank 11 of base tube 1 by the mode welded, to improve the steadiness of throttling element 3 further. Upper cover can also be provided above, so that formation fluid flows in vortex chamber 31 from access road 32 in plate-like body 34. The upper surface of upper cover can be the arcwall face that the inwall with overcoat 2 fits, in order to install upper cover.

When being provided with upper cover in plate-like body 34, the flatness of both binding faces can all between �� 0.0016mm. The material of upper cover can be identical with the material of plate-like body 34, all adopts the Anti-erosion material of hardness higher (HRA > 87). Both can adopt friction welding (FW) to be welded as a whole. Overall throttling element 3 after welding can adopt Laser Welding or copper brazing to load in holding tank 11.

The general shape of vortex chamber 31 is toroidal, and throttle orifice 33 is positioned at the circle centre position of vortex chamber 31. Access road 32 includes the reducing section 321 that is gradually reduced along the flow direction cross-sectional area of formation fluid and along the substantially constant Connectivity Section 322 of the flow direction cross-sectional area of formation fluid. Local layer fluid is flowed in vortex chamber 31 by Connectivity Section 322 after flowing into reducing section 321.

It is further preferable that the two of reducing section 321 sidewalls are arc shape. Two sidewalls of Connectivity Section 322 are plane, in order to processing and setting. One sidewall of Connectivity Section 322 and the sidewall of vortex chamber 31 are smoothly connected, and extend along the tangential direction of vortex chamber 31, and another sidewall and vortex chamber 31 are tightly connected.

After the water in formation fluid flows into throttling element 3, first passing through access road 32 throttling and accelerate, the tangential direction then along vortex chamber 31 enters vortex chamber 31. When the water yield flowing into vortex chamber 31 is gradually increased, the tangential velocity eddy flow gradually that water can move with the tangential direction along vortex chamber 31 is to the middle part of vortex chamber 31, and flows out from throttle orifice 33. Owing to the density of water is big, viscosity is little and then causes that the inertia force of water is big, so that the tangential velocity that water is in vortex chamber 31 is higher. So, when the fineness of vortex chamber 31 is higher, when the viscosity of water is relatively low, allow for water tangential velocity loss in the process of eddy flow less. According to law of conservation of energy, constantly reducing along with radius of turn, the tangential velocity of water can constantly increase. Before entering throttle orifice 33, the tangential velocity of water reaches maximum, and after flowing out throttle orifice 33, the tangential velocity of water can be greatly reduced. When being left out gravity and affecting, the additional pressure drop that the water that eddy flow is gone out produces is represented by:

Wherein, ��WaterRepresent the density of water, ��Water cuts 1Represent water maximal rate in vortex chamber 31, ��Water cuts 2Represent water speed after flowing out throttle orifice 33.

Relative to directly adopting throttle orifice 33 to carry out the control device throttled, the control device that the present invention proposes adds extra tangential velocity throttle resistance when water flows out throttle orifice 33. Owing to the rotary speed of water is relatively big, after throttling, the swirl velocity of water declines relatively big, and then water makes the throttle resistance produced bigger. When identical throttle orifice 33, the throttle resistance produced by device that controls adopting the present invention is more than 20 times of conventional nozzle type control device, greatly improves control water effect.

After the oil of formation fluid flows into throttling element 3, the throttling first passing through access road 32 is accelerated, and the tangential direction then along vortex chamber 31 enters vortex chamber 31. When the oil mass flowing into vortex chamber 31 is gradually increased, the tangential velocity eddy flow gradually that oil can move with the tangential direction along vortex chamber 31 is to the middle part of vortex chamber 31, and flows out from throttle orifice 33. Owing to the density of oil is little, viscosity is big and then causes that the viscous force of oil is big, so that the tangential velocity that oil is in vortex chamber 31 is relatively low. So so that oil tangential velocity loss in the process of eddy flow is bigger. The size of concrete tangential velocity loss is directly related with the oil viscosity adopted, and oil viscosity is more big, and oil loss of tangential velocity in the process rotated is more big. Before entering throttle orifice 33, the tangential velocity of oil reaches maximum, but less relative to the tangential velocity of water. After throttle orifice 33, the tangential velocity of oil is further reduced. When being left out gravity and affecting, the additional pressure drop �� P that the oil that eddy flow is gone out producesOilIt is represented by:

Wherein, ��OilRepresent the density of oil, ��Oil cuts 1Represent oil maximal rate in vortex chamber 31, ��Oil cuts 2Represent oil speed after flowing out throttle orifice 33.

Relative to directly adopting throttle orifice 33 to carry out the control device throttled, the control device that the present invention proposes adds extra tangential velocity throttle resistance when oil flows out throttle orifice 33. Owing to oil has certain rotary speed when flowing out, and then the throttle resistance of oil generation is made to there has also been certain increase, it is possible to so that oil produces additional choke pressure drop. But relative to water, it is less that the additional choke pressure drop of oil increases. Therefore, control device proposed by the invention has chance water height frictional resistance, meets oily low frictional resistance, regulates the function of profit resistance voluntarily.

After formation fluid flows into throttling element 3 with the state of oil water mixture, the viscosity of the different oil water mixtures according to moisture content is between water, oil, the additional resistance of its generation is also between water, oil, when the moisture content of oil water mixture is relatively low, the additional drag that throttling element produces is close with the additional drag produced during separately through oil, along with the increase of moisture content, the additional drag that throttling element produces is gradually increased, the additional drag being eventually increased to producing during separately through water. Control device proposed by the invention has along with water-cut variation, regulates the function of resistance voluntarily.

Additionally, the bottom surface of access road 32 and vortex chamber 31 is in same plane. And the bottom surface of the bottom surface of access road 32 and vortex chamber 31 is smoothly connected. It is further preferable that the roughness of vortex chamber 31 is less than 0.0032mm, to reduce the frictional resistance that formation fluid is produced by vortex chamber 31, thus improving the ability of water and oil control further. The Rockwell hardness HRA of plate-like body 34 can more than 87, and its material can select tungsten-cobalt alloy.

Preferably, the height of vortex chamber 31 is 2.4-5.0mm. If when the height of vortex chamber 31 is less, owing to the flowing space of fluid is too small so that formation fluid cannot in vortex chamber 31 proper flow. If when the height of vortex chamber 31 is higher, owing to the flowing space of vortex chamber is excessive, open ended fluid is too much, and speed when making formation fluid eddy flow to throttle orifice 33 is less, thus the choke pressure drop produced is less. The diameter of vortex chamber 31 is 18-32mm. The aperture of throttle orifice 33 is 3-6mm. So, can pass through that throttle orifice 33 realization throttles at the same time it can also be reduce the probability that throttle orifice 33 is blocked.

In one example, when every day, to flow through the flow of each throttling element 3 be 2.5-40m3Time, vortex chamber 31 highly preferred for 4mm. The diameter of vortex chamber 31 is preferably 23.5mm. The aperture of throttle orifice 33 is preferably 4mm. Certainly, when flowing through the changes in flow rate of vortex chamber 31, the diameter of vortex chamber 31 and height can also change therewith.

Additionally, the circumference along vortex chamber 31 is evenly provided with at least two access road 32. In one embodiment, it is circumferentially with two access roades 32 along vortex chamber 31. Two access roades 32 are positioned at the diagonal angle place of plate-like body 34. And two access roades 32 are arranged in the opposite direction.

Further, the ratio of the maximum cross section area of reducing section 321 and the cross-sectional area of Connectivity Section 322 is 4-5:1. As such, it is possible to make formation fluid form comparatively suitable acceleration, such that it is able to improve the choke pressure drop of formation fluid further.

Although by reference to preferred embodiment, invention has been described, but without departing from the scope of the invention, it is possible to it is carried out various improvement and parts therein can be replaced with equivalent. Especially, as long as being absent from structural hazard, the every technical characteristic being previously mentioned in each embodiment all can combine in any way. The invention is not limited in the specific embodiment disclosed in literary composition, but include all technical schemes falling in scope of the claims.

Claims (15)

1. the control device for adjustably layer fluid, including throttling element, described throttling element includes plate-like body, is arranged on the vortex chamber of described plate-like body, for accepting formation fluid and enabling its flow into the access road of described vortex chamber, and it is located at the throttle orifice at the middle part of described vortex chamber, wherein, described access road and described vortex chamber are configured so that formation fluid enters described vortex chamber along the sidewall of described vortex chamber, and discharge through described throttle orifice.
2. control device according to claim 1, it is characterized in that, described access road includes the reducing section that cross section is gradually reduced along the flow direction of formation fluid, and respectively with described reducing section and described vortex chamber connects and cross section is constant Connectivity Section.
3. control device according to claim 2, it is characterised in that described Connectivity Section is configured to extend along the tangential direction of described vortex chamber, and the sidewall of described Connectivity Section sidewall and described vortex chamber is smoothly connected.
4. the control device according to Claims 2 or 3, it is characterised in that the ratio of the maximum cross section area of described reducing section and the cross-sectional area of described Connectivity Section is 4-5:1.
5. the control device according to any one of claim 1-4, it is characterised in that described vortex chamber is circular, and described throttle orifice is positioned at the center of circle of described vortex chamber.
6. the control device according to any one of claim 1-5, it is characterised in that the circumference along described vortex chamber is evenly provided with access road described at least two.
7. the control device according to any one of claim 1-6, it is characterized in that, also include for accepting the base tube of the formation fluid of outflow from described throttling element, wherein, described throttling element is located at the outside of described base tube, and described base tube is provided with for making formation fluid flow into the pod apertures of described throttling element from stratum.
8. control device according to claim 7, it is characterized in that, it is circumferentially with multiple being spaced and the holding tank of corresponding different pod apertures along described base tube, wherein, each described holding tank is respectively equipped with a throttling element, and the formation fluid that described holding tank is configured to from described pod apertures flows out flows into described throttling element through described holding tank.
9. the control device according to any one of claim 1-8, it is characterised in that the diapire of described vortex chamber and the diapire of described access road are in same plane.
10. the control device according to any one of claim 1-9, it is characterised in that formation fluid is oil, water or oil water mixture.
11. the control device according to any one of claim 1-10, it is characterised in that the roughness of the diapire of described vortex chamber and the diapire of described access road is all at below 0.0032mm.
12. the control device according to any one of claim 1-11, it is characterised in that the diameter of described throttle orifice is 3-6mm.
13. the control device according to any one of claim 1-12, it is characterised in that the height of described vortex chamber is 2.4-5.0mm, and diameter is 18-32mm.
14. the control device according to claim 7 or 8, it is characterised in that the diameter of described pod apertures is 3-6mm.
15. the control device according to claim 7 or 8, it is characterised in that also including the overcoat being set in the outside of described base tube, wherein said throttling element is arranged between described base tube and described overcoat.
CN201410645373.4A 2014-11-06 2014-11-06 Control device used for regulating formation fluid CN105626003A (en)

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