CN102784728B - Downhole two-stage cyclone separator - Google Patents
Downhole two-stage cyclone separator Download PDFInfo
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- CN102784728B CN102784728B CN201210292638.8A CN201210292638A CN102784728B CN 102784728 B CN102784728 B CN 102784728B CN 201210292638 A CN201210292638 A CN 201210292638A CN 102784728 B CN102784728 B CN 102784728B
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Abstract
The invention provides an underground two-stage cyclone separator, which comprises: the outer pipe is provided with a produced liquid inlet; a first stage cyclone separator disposed in the outer tube, the first stage cyclone separator comprising: the first inner cavity is internally provided with a first inlet, a first rich oil overflow channel and a first rich water discharge channel; a second stage cyclonic separator disposed in the outer tube, the second stage cyclonic separator comprising: the second inner cavity is provided with a second inlet, a second oil-rich overflow channel and a second water-rich discharge channel; a rich oil flow passage provided in the outer pipe and connecting the first rich oil overflow passage and the second rich oil overflow passage; the first-stage cyclone separator and the second-stage cyclone separator are connected in series, the first inlet is communicated with the output liquid inlet, and the first rich water discharge channel is connected with the second inlet.
Description
Technical field
The present invention relates to petrochemical industry and field of Environment Protection, belong to liquid-liquid two-phase separating treatment technology, in particular to a kind of down-hole secondary cyclone separator, separate for downhole oil-water.
Background technology
At present, mainly containing rotational flow separation, air supporting choosing, filtration for the fast separating process of liquid-liquid diphase (describing as an example of profit two-phase example) separates with film etc.The scope that air supporting choosing adapts to oil concentration variation is little; Filtration can realize the separation of profit two-phase preferably, but needs backwash frequently to guarantee the long-term stability operation of equipment for high oil-polluted water; Membrane separation plant cost is higher, requires comparatively strict again to ambient condition.Rotational flow separation has that equipment volume is little, separative efficiency advantages of higher, is used widely in a lot of industries, but only for surface separation.
The separation principle of hydrocyclone is utilize the density contrast between medium and carry out centrifugation, density contrast is larger, the particle diameter of decentralized photo is larger, separating effect is relatively just better, also obtained certain application (Northeast Petroleum University has successively applied for multinomial correlation technique patent, as ZL 98211681.0, ZL 01279933.5 and ZL 01277425.1 etc.) in China as a kind of oily water separating equipment at present.
Oil field well oily water separation technique due to the restriction of eliminator separating effect, same note water quality etc., is well applied at present.Along with going deep into of oilfield exploitation, the moisture content of Produced Liquid progressively increases, and recovered water has not only increased lifting and operating cost greatly, and for bringing very large environmental protection pressure in ground, oil field.
Summary of the invention
The present invention aims to provide a kind of down-hole secondary cyclone separator, to solve the problem of prior art at weak effect aspect the separation of downhole oil-water.
For this reason, the present invention proposes a kind of down-hole secondary cyclone separator, and described down-hole secondary cyclone separator comprises: outer tube, and described outer tube is provided with production fluid import; Be arranged on the first order cyclone separator in described outer tube, described first order cyclone separator comprises: the first inner chamber in the first tube wall and described the first tube wall, is provided with the first entrance, the first rich oil overflow ducts and the first rich water passing away in described the first inner chamber; Be arranged on the second level cyclone separator in described outer tube, described second level cyclone separator comprises: the second inner chamber in the second tube wall and described the second tube wall, is provided with the second entrance, the second rich oil overflow ducts and the second rich water passing away in described the second inner chamber; Oil rich stream passage, is arranged in described outer tube and connects described the first rich oil overflow ducts and described the second rich oil overflow ducts; Wherein, described first order cyclone separator and described second level cyclone separator are connected in series, and described the first entrance is communicated with described production fluid import, and described the first rich water passing away is connected with described the second entrance.
Further, described outer tube is straight tube, and described first order cyclone separator is coaxially connected from beginning to end successively with described second level cyclone separator, and described oil rich stream channel setting is outside described the first tube wall and described the second tube wall.
Further, in described the first inner chamber, be provided with the first spirality eddy flow chamber being communicated with described the first entrance, the end in described the first spirality eddy flow chamber is communicated with described the first rich water passing away, described down-hole secondary cyclone separator also comprises: the collection chamber that is connected to the head end of described the first rich oil overflow ducts, described collection chamber is arranged in described outer tube, the end of described the first rich oil overflow ducts is positioned at the front end in described the first spirality eddy flow chamber, and is positioned at the axle center place of front end.
Further, described first order cyclone separator also comprises: be arranged on the guiding base cone in described the first rich water passing away, described guiding base cone extend in described the first spirality eddy flow chamber, the described conical surface forms cone point, described the first rich oil overflow ducts is positioned at the central authorities of described the first inner chamber, and described cone point is towards described the first rich oil overflow ducts and be positioned at the central authorities of described the first inner chamber.
Further, the bottom of described guiding base cone is arranged on described the second entrance, and described cone point is the diameter in the described first spirality eddy flow chamber of 8 to 15 times with the spacing of the end of described the first rich oil overflow ducts.
Further, described guiding base cone comprises: the first cone section being connected and the second cone section, and it is upper that described cone point is positioned at described the second cone section, and the tapering of described the first cone section is less than the tapering of described the second cone section.
Further, described second level cyclone separator is arc curve transition double-cone hydraulic swirler.
Further, be also provided with the oil well pump being communicated with the first rich oil overflow ducts on described outer tube, described oil well pump is positioned at the head end of described the first rich oil overflow ducts.
Further, in described outer tube, be also provided with the collect cavity being communicated with the second rich water passing away, and the injection pump being connected with described collect cavity.
Further, described in described oil rich stream passage, pass through seal interval with production fluid import.
Owing to having adopted first order cyclone separator and second level cyclone separator two-stage cyclone separator altogether, production fluid has passed through two-stage separation energy and has accessed effective processing, increase oil production, after guaranteeing again second-stage separator processing, rich current reach down-hole with the same note of well index, reach the effect of environmental protection, made downhole oil-water separation and form as possibility with well is same.
And then, in first order cyclone separator of the present invention, there is guiding base cone and cone point (also referred to as thimble), make like this oil droplet assemble near thimble, and along thimble Upward Migration, shorten the distance that oil phase flows out from overfall, be beneficial to the further separation of oil-polluted water.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of the down-hole secondary cyclone separator of the embodiment of the present invention;
Fig. 2 is according to the operating principle schematic diagram of the first order cyclone separator of the embodiment of the present invention.
Drawing reference numeral explanation:
1, outer tube 11, seal 13, production fluid import 15, collection chamber 17, oil rich stream passage
19, seal 2, first order cyclone separator 21, the first tube wall 23, the first inner chamber
25, guiding base cone 230, the first entrance 231, the first spirality eddy flow chamber 235, the first rich oil overflow ducts
237, the first rich water passing away 251, cone point 253, the conical surface 252, the first cone section 254, the second cone section
3, second level cyclone separator 30, the second tube wall 34, the second rich water passing away 36, collect cavity
320, the second entrance 321, the second spirality eddy flow chamber 323, the second rich oil overflow ducts
100, down-hole secondary cyclone separator
The specific embodiment
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawing explanation the specific embodiment of the present invention.
As shown in Figure 1, comprise according to the down-hole secondary cyclone separator 100 of the embodiment of the present invention: outer tube 1, be arranged on the first order cyclone separator 2 in described outer tube and be arranged on the second level cyclone separator 3 in described outer tube.Described outer tube 1 is provided with production fluid and enters 13, to obtain production fluid from down-hole.Outer tube 1 can be connected with oil pipe by connector or connecting portion, for example, take the linkage section of oblique thread forms to connect with down-hole corollary apparatus.
Rotational flow separation principle is utilize the density contrast of two kinds of immiscible liquid media and carry out centrifugation.Under the effect of centrifugal force, density is compared with heavy phase---and water is got rid of to wall; Meanwhile, the lighter phase of density---oil is pushed to center.Like this, oil is discharged from the bleed off pipe at middle part, and water, to underflow opening motion, is discharged by underflow opening, thereby realized rotational flow separation.
Described first order cyclone separator 2 comprises: the first inner chamber 23 in the first tube wall 21 and described the first tube wall, is provided with the first entrance 230, the first rich oil overflow ducts 235 and the first rich water passing away 237 in described the first inner chamber 23.When the first rich oil overflow ducts 235 is first separation (separating for the first time), the passing away of the liquid that oil-containing is many, for example, can be the pipeline with hole, when the first rich water passing away 237 is first separation, and the passing away of moisture many liquid.
Described second level cyclone separator 3 comprises: the second inner chamber (not indicating in figure) in the second tube wall 30 and described the second tube wall 30, is provided with the second entrance 320, the second rich oil overflow ducts 323 and the second rich water passing away 34 in described the second inner chamber.When the second rich oil overflow ducts 323 is secondary separation, the passing away of the liquid that oil-containing is many, when the second rich water passing away 34 is secondary separation (separating for the second time), the passing away of moisture many liquid, is also drainage channel final after twice separation.
Oil rich stream passage 17, is arranged in described outer tube 1 and connects described the first rich oil overflow ducts 235 and described the second rich oil overflow ducts 323.The oil that down-hole secondary cyclone separator is separated is the summation from the first rich oil overflow ducts 235 and described the second rich oil overflow ducts 323.Described first order cyclone separator 2 is connected in series with described second level cyclone separator 3, like this, can on the basis of first separation, carry out secondary separation, guarantee the high efficiency of secondary cyclone separator processing, guarantee that the rear rich current of second-stage separator processing reach down-hole with the same note of well index.Wherein, described the first entrance 230 is communicated with described production fluid import 13, and described the first rich water passing away 237 is connected with described the second entrance 320.
One-level cyclone adopts spiral flow passage type entrance structure, compares conventional disc type entrance structure and reduces spatial volume, and can provide sufficient tangential velocity for cyclone enters oral fluid stream, guarantees separative efficiency.
Primary cyclone underflow opening structure adopts spiral flow passage type outlet, when providing spiral liquid flow for second cyclone, reduce secondary cyclone separator entrance annular space structure, directly be connected with secondary cyclone separator, shorten the axial dimension of overall separation section, and guaranteed the axiality of down-hole secondary cyclone separator.
Secondary oil rich stream and one-level oil rich stream all, by entrance structure Chu Kai radial hole UNICOM oil rich stream passage, reduce the use of seal like this, save redundant space.
Further, as shown in Figure 1, described outer tube 1 is straight tube, described first order cyclone separator 2 is coaxially connected from beginning to end successively with described second level cyclone separator 3, conventionally, described first order cyclone separator 2 is arranged on the upper end of described second level cyclone separator 3, like this, can reduce the radial dimension of outer tube 1, adapt to the working environment of downhole oil-water separation, described oil rich stream passage 17 is arranged on outside described the first tube wall 21 and described the second tube wall 30, be that oil rich stream passage 17 is arranged between described the first tube wall 21 and outer tube 1, and between described the second tube wall 30 and outer tube 1, can utilize like this first tube wall 21, the annular space of described the second tube wall 30 and outer tube, make size of outer tube little, reduce the addition entry point structure of second cyclone, guarantee the liquid stream continuity of one-level and secondary, can offer the stable liquid phase of secondary cyclone separator.
Further, as depicted in figs. 1 and 2, be provided with the first spirality eddy flow chamber 231 being communicated with described the first entrance 230 in described the first inner chamber 23, the end in described the first spirality eddy flow chamber 231 is communicated with described the first rich water passing away 237.The first spirality eddy flow chamber 231 is, in the first tube wall 21, helicla flute is set, and the mixed liquor that makes to enter oil in the first tube wall 21 and water forms eddy flow.Preliminary election and current stabilization effect are played in the first spirality eddy flow chamber 231.Because down-hole secondary cyclone separator is arranged on down-hole, for separating of the oil of underground mining and the mixed liquor of water, the working depth of down-hole secondary cyclone separator even goes up km apart from ground hundreds of rice, like this, enter first oil in spirality eddy flow chamber 231 and the mixed liquor of water under the effect of huge down-hole pressure, produce High Rotation Speed, thereby, the present invention is without independent drive unit, and for example motor drives oil and the mixed liquor of water to be rotated, energy-conserving and environment-protective.
As shown in Figure 1, described down-hole secondary cyclone separator 2 also comprises: the collection chamber 15 that is connected to the head end of described the first rich oil overflow ducts, described collection chamber 15 is arranged in described outer 1 pipe, the end (being lower end in Fig. 1) of described the first rich oil overflow ducts 235 is positioned at the end in described the first spirality eddy flow chamber 231, for example be positioned at front end, and be positioned at the axle center place of front end.Like this, the oil (or liquid) of separating is for the first time pumped from upper end, moisture many liquid of separating enters lower end and separates for the second time, in separating for the first time, in the contrary trend of oil and water and the production of recovering the oil, oil will pump up, water will be noted with underground object and match, and has saved the energy.
Further, as shown in Figure 1, described first order cyclone separator 2 also comprises: be arranged on the guiding base cone 25 in described the first rich water passing away 237, described guiding base cone 25 extend in described the first spirality eddy flow chamber 231, the described conical surface 253 forms cone point 251, described the first rich oil overflow ducts 235 is positioned at central authorities' (being positioned on the axis of the first inner chamber 23) of described the first inner chamber 23, and described cone point 251 is towards described the first rich oil overflow ducts 235 and be positioned at central authorities' (being positioned on the axis of the first inner chamber 23) of described the first inner chamber 23.Oil enters behind the first spirality eddy flow chamber 231 with the mixed liquor of water, High Rotation Speed all in whole the first inner chamber 23, even if leave other parts that the first spirality eddy flow chamber 231 enters the first inner chamber 23, and also can High Rotation Speed.The oil (or the many liquid of oil-containing) that a part is separated directly enters the first rich oil overflow ducts 235, the liquid that does not enter the first rich oil overflow ducts 235 is advanced into down in the first rich water passing away 237, owing to still continuing rotational flow separation in this process, so also have oil or oil droplet to continue to separate, by guiding base cone 2, can make this part oil or oil droplet move along the conical surface 253, arrive after cone point 251, enter into the first rich oil overflow ducts 235 with the direction consistent with the axis of the first inner chamber 23, like this, can improve the efficiency separating for the first time, reduce the burden separating for the second time.Therefore, guiding base cone 2 can make up the deficiency of the first rich oil overflow ducts 235.
At present, existing cyclone inside does not have thimble (cone point), a just conical tube structure closing up downwards.This structure underflow opening is a pipe, can not form tangential fluid form.The sharp benefit of cone of the present invention is that bottom delivery port (the first rich water passing away 237) and the entrance of conventional cyclone are organically combined.Make two-stage form a unified organic whole.
Further, as shown in Figure 1, the bottom of described guiding base cone 25 is arranged on described the second entrance 320, and described cone point 251 is the diameter in the described first spirality eddy flow chamber 231 of 8 to 15 times with the spacing d of the end of described the first rich oil overflow ducts 235.Spacing d is too large, and guiding base cone 25 is difficult to oil or oil droplet to be delivered in the first rich oil overflow ducts 235, and spacing d is too little, is unfavorable for the oil of cone bottom point or the conveying of oil droplet.
Further, as shown in Figure 2, described guiding base cone comprises: the first cone section 252 being connected and the second cone section 254, described cone point 251 is positioned in described the second cone section 254, the tapering E of described the first cone section is less than the tapering F of described the second cone section, like this, play the effect of a gathering and break-in, so that oil or oil droplet move towards the first rich oil overflow ducts 235 as early as possible.
As shown in Figure 2, the operating principle of first order cyclone separator 2 is: the upper side of first order cyclone separator 2 is to having the first entrance 230, production fluid enters into the first inner chamber 23 from the first entrance 230 side direction, the oil of separating or (liquid that oil-containing is many) flow out from the top of the first rich oil overflow ducts 235, moisture many liquid first rich water passing aways 237 laterally disposed from bottom flow out, and the first entrance 230 and the laterally disposed mode of the first rich water passing away 237 are convenient to the stable separated space of the interior formation of the first inner chamber 23.
Further, described second level cyclone separator 3 is arc curve transition double-cone hydraulic swirler, and first order cyclone separator 2 is realized and being closely connected without middle annular space with second level cyclone separator 3, has guaranteed very high axiality.Arc curve transition double-cone hydraulic swirler is for example referring to the patent of ZL01279933.5, and the principle of this eliminator is also rotational flow separation, plays the further effect of purification of rich current that one-level eddy flow is obtained, to reach the discharge index on selected stratum, down-hole.Although secondary cyclone separator all adopts rotational flow separation principle, different because of its effect, adopt different form of structure.Just the internal cone type cyclone separator (first order cyclone separator 2) of point effect has been set up the thimble structure of two sections of cone angles in inside, oil droplet is assembled near thimble, and along thimble Upward Migration, be beneficial to the further separation of oil-polluted water, by just dividing, by separation of oil main production fluid out; The eliminator (second level cyclone separator 3) of the second level mainly plays the effect that rich current are further purified, be that can water after treatment reach the key of same well with note index, the arc curve transition double-cone hydraulic swirler of employing has efficient oil removing separating effect.Therefore, this cascaded structure has guaranteed the efficient separating effect of entirety at two ends.The combined efficiency of these two kinds of cyclone separators is high, optimizes the separating effect of eliminator, can module combine, and can be optimized modification according to the middle and high specific well conditions containing well, has widened its popularizing application prospect.
Further, on described outer tube 1, be also provided with the oil well pump (not shown) being communicated with the first rich oil overflow ducts 235, described oil well pump is positioned at the head end of described the first rich oil overflow ducts 235, for example, oil well pump is positioned at the top of collection chamber 15, to pump, oil well pump can be ground driven screw pump, can be also submersible electric pump or submersible screw pump.
Further, in described outer tube 1, be also provided with the collect cavity 36 being communicated with the second rich water passing away 34, and the injection pump being connected with described collect cavity 36, with by under water Injection Well.
Further, as shown in Figure 1, described in described oil rich stream passage 17 with production fluid import 134 by seal interval, on top, by seal 11 intervals, in bottom, spaced apart by seal 19.Seal 11 and seal 19 are for example sealing ring.
In the present invention, down-hole secondary cyclone separator 100 forms two-stage tandem with module combining form and arranges, is arranged in down-hole oil production section by sealing device.Underground oil-water mixed liquor flows into through the borehole wall, the internal cone type cyclone separator (being first order cyclone separator 2) of the one-level of successively flowing through and the arc curve transition double-cone hydraulic swirler (being second level cyclone separator 3) of secondary.The annular oil-collecting passage (oil rich stream passage) that oil rich stream (liquid that oil-containing is many) forms between eliminator and the borehole wall is pumped to ground by oil extraction pump, rich current (moisture many liquid) reach the discharge index of down-hole formation, directly inject in the middle of formation at target locations with well is same.
Compare with other water treatment technologies and equipment, down-hole secondary cyclone separator 100 structures are compacter, and two kinds of monomer hydrocyclone separation structures that the present invention relates to are respectively because its spiral inlet form and arc curve transition double-cone hydraulic swirler structure have realized the efficient separating effect under minor diameter; Equipment itself, without any driver part, utilizes natural force completely, is beneficial in down-hole and uses.
The foregoing is only the schematic specific embodiment of the present invention, not in order to limit scope of the present invention.For each ingredient of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, not departing from equivalent variations and the modification done under the prerequisite of design of the present invention and principle, all should belong to the scope of protection of the invention.
Claims (9)
1. a down-hole secondary cyclone separator, is characterized in that, described down-hole secondary cyclone separator comprises:
Outer tube, described outer tube is provided with production fluid import;
Be arranged on the first order cyclone separator in described outer tube, described first order cyclone separator comprises: the first inner chamber in the first tube wall and described the first tube wall, is provided with the first entrance, the first rich oil overflow ducts and the first rich water passing away in described the first inner chamber;
Be arranged on the second level cyclone separator in described outer tube, described second level cyclone separator comprises: the second inner chamber in the second tube wall and described the second tube wall, is provided with the second entrance, the second rich oil overflow ducts and the second rich water passing away in described the second inner chamber;
Oil rich stream passage, is arranged in described outer tube and connects described the first rich oil overflow ducts and described the second rich oil overflow ducts;
Wherein, described first order cyclone separator and described second level cyclone separator are connected in series, and described the first entrance is communicated with described production fluid import, and described the first rich water passing away is connected with described the second entrance;
In described the first inner chamber, be provided with the first spirality eddy flow chamber being communicated with described the first entrance, the end in described the first spirality eddy flow chamber is communicated with described the first rich water passing away, described down-hole secondary cyclone separator also comprises: the collection chamber that is connected to the head end of described the first rich oil overflow ducts, described collection chamber is arranged in described outer tube, the end of described the first rich oil overflow ducts is positioned at the front end in described the first spirality eddy flow chamber, and is positioned at the axle center place of front end.
2. down-hole as claimed in claim 1 secondary cyclone separator, it is characterized in that, described outer tube is straight tube, and described first order cyclone separator is coaxially connected from beginning to end successively with described second level cyclone separator, and described oil rich stream channel setting is outside described the first tube wall and described the second tube wall.
3. the down-hole secondary cyclone separator as described in any one in claim 1 to 2, it is characterized in that, described first order cyclone separator also comprises: be arranged on the guiding base cone in described the first rich water passing away, the conical surface of described guiding base cone forms cone point, described the first rich oil overflow ducts is positioned at the central authorities of described the first inner chamber, and described cone point is towards described the first rich oil overflow ducts and be positioned at the central authorities of described the first inner chamber.
4. down-hole as claimed in claim 3 secondary cyclone separator, it is characterized in that, the bottom of described guiding base cone is arranged on described the second entrance, and described cone point is the diameter in the described first spirality eddy flow chamber of 8 to 15 times with the spacing of the end of described the first rich oil overflow ducts.
5. down-hole as claimed in claim 3 secondary cyclone separator, it is characterized in that, described guiding base cone comprises: the first cone section being connected and the second cone section, and it is upper that described cone point is positioned at described the second cone section, and the tapering of described the first cone section is less than the tapering of described the second cone section.
6. down-hole as claimed in claim 1 secondary cyclone separator, is characterized in that, described second level cyclone separator is arc curve transition double-cone hydraulic swirler.
7. down-hole as claimed in claim 1 secondary cyclone separator, is characterized in that, is also provided with the oil well pump being communicated with the first rich oil overflow ducts on described outer tube, and described oil well pump is positioned at the head end of described the first rich oil overflow ducts.
8. down-hole as claimed in claim 1 secondary cyclone separator, is characterized in that, is also provided with the collect cavity being communicated with the second rich water passing away in described outer tube, and the injection pump being connected with described collect cavity.
9. down-hole as claimed in claim 1 secondary cyclone separator, is characterized in that, described in described oil rich stream passage with production fluid import by seal interval.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210292638.8A CN102784728B (en) | 2012-08-16 | 2012-08-16 | Downhole two-stage cyclone separator |
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| CN201210292638.8A CN102784728B (en) | 2012-08-16 | 2012-08-16 | Downhole two-stage cyclone separator |
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| CN102784728B true CN102784728B (en) | 2014-05-14 |
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| NO933517L (en) * | 1993-10-01 | 1995-04-03 | Anil As | Process for the recovery of hydrocarbons in an underground reservoir |
| CN200955384Y (en) * | 2006-09-23 | 2007-10-03 | 中国石化股份胜利油田分公司海洋采油厂 | Oil-gas separator for electric submersible pump |
| CN201389497Y (en) * | 2009-03-06 | 2010-01-27 | 大庆石油学院 | Internal cone type liquid-liquid separation hydraulic swirler |
| CN202165055U (en) * | 2011-01-17 | 2012-03-14 | 中国石油大学(华东) | Same-well underground oil-water separating extraction and injection device with surface driving single-screw pump |
| CN202300333U (en) * | 2011-10-10 | 2012-07-04 | 中国石油大学(华东) | Underground oil-water separating and same-well extracting and injecting device utilizing electric submersible screw pump |
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