CN103900806A - Anti-clogging ability evaluation test device and method for sand-control screen pipe - Google Patents
Anti-clogging ability evaluation test device and method for sand-control screen pipe Download PDFInfo
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Abstract
The invention discloses an anti-clogging ability evaluation test device for a sand-control screen pipe. The anti-clogging ability evaluation test device comprises a kettle, a stirring assembly and a flow distribution pipe, wherein an upper end cover of the kettle is in detachable connection with the side wall of the kettle. The upper end cover is provided with a first hole, a lower end cover is provided with a liquid outlet, and the kettle is provided with a sand adding opening. The stirring assembly comprises a stirring paddle, a connecting rod and a coupling rod, wherein the stirring paddle makes contact with a sand-control screen pipe sample piece; one end of the connecting rod is connected with the stirring paddle, and the other end of the connecting rod is connected with the coupling rod; a fluid channel is formed in the coupling rod, and an outlet of the fluid channel is connected with one end of the flow distribution pipe; one end of the flow distribution pipe is matched with the stirring paddle. The test device further comprises a sample piece plug and a sample piece base, and the sample piece plug and the sample piece base are used for being sealed in cooperation with the upper end and the lower end of the sand-control screen pipe sample piece. The anti-clogging ability of the sand-control screen pipe itself can be evaluated through the test device in combination with a test method.
Description
Technical field
The present invention relates to technical field of petroleum extraction, particularly a kind of sand control screen anti-blockage capability evaluation experimental device and method.
Background technology
In technical field of petroleum extraction, during particularly for loose hydrocarbon-bearing pool exploitation, owing to generally shaking out, need to take sand-preventing process exploitation in recovery process.Current described sand-preventing process mainly adopts sand control screen to carry out sand control.
The sand control screen using in existing oil well comprises: wire wrapped screen, elastic screen, cutting seam sieve tube, metal wool screen casing, metal net screen casing, accurate composite microporous screen casing, pre-filling gravel screen pipe.Inside at described sand control screen is provided with filtering layer, i.e. sand block medium.There is the sand block medium of different structure for different sand control screens.In oil well production process, described sand control screen is positioned at oil well, when layer fluid is carried the materials such as stratum fine sand, mechanical impurity, clay shale by described sand control screen peripherally, particulate matter in fluid is easily stuck and viscous in the sand block medium inside of described sand control screen, forms and stops up.Described obstruction can cause the overcurrent hydraulic performance decline of described sand control screen, and fluid becomes large by the resistance to flow of described sand control screen, and oil well output reduces, and can cause oil well to stop production when serious.Therefore sand control screen anti-blockage capability is to affect oil well output and the key factor in sand control life-span.Described sand control screen before use, need to carry out test evaluation to its anti-blockage capability.
Because different sand control screens has the sand block medium of different structure, its anti-blockage capability there are differences.In actual use, in the case of other performance of sand control screen meets the demands, should select as much as possible those to be not easy to be stopped up by particulate matter, i.e. the good sand control screen of anti-blockage capability.The described particulate matter that easily causes sand control screen to stop up mainly comprises: the gum asphalt in stratum fine silt, clay shale material, crude oil.
At present, the method for evaluating sand prevention screen casing anti-blockage capability is mainly to utilize sand control simulation test device, and by test sand control screen, under simulation sand control situation, fluid changes by described sand control screen pressure reduction the anti-blockage capability that carrys out evaluating sand prevention screen casing.But, be filled in the layer of sand outside described sand control screen, due to bridging action, self can form one deck sand block barrier.This sand block barrier, can stop that the particulate matters such as the gum asphalt in stratum fine silt, clay shale material, crude oil enter the sand block medium of sand control screen, thereby may make test result be subject to the impact of described sand block barrier.
In order to remove described sand block barrier, within on 04 24th, 2013, Chinese patent specification CN103063422A discloses a kind of sand control screen sand block accuracy detecting device and detection method.As shown in Figure 1, described sand control screen sand block accuracy detecting device comprises: autoclave body 1, shunting webmaster 2 and mixing component 3.When use, sand control screen sample 4 is arranged on the inside of described autoclave body 1, and the periphery that described mixing component 3 is centered around sand control screen sample 4 rotates in a circumferential direction.Described mixing component 3 in the process of rotation, can remove sand block accuracy testing process in the sand block barrier of sand control screen sample 4 outer formation.
Because the test(ing) medium adopting in described sand control screen sand block accuracy checking method is that spherical sand grains and clear water are tested, by using described mixing component 3 can remove well the sand block barrier of sand control screen sample 4 outer formation.Be the mixture slurry of stratum fine silt, clay shale material and the crude oil with very strong adhesion and need the test(ing) medium using in sand control screen anti-clogging experiment, or there is the test slurry of similarity.Because described test slurry has very strong adhesion, easily pile up and stick at hollow and the dead angle place of sand control screen sample 4 peripheries.Described test slurry makes to test sand grains and can not fully contact with the filter element of described sand control screen sample 4 with sticking in the accumulation of sand control screen sample 4 peripheries, and then makes the peripheral sand block barriers that easily form of described sand control screen sample 4.And described sand block barrier relies on simple Stirring mode can not effectively be removed.
Summary of the invention
The object of this invention is to provide a kind of sand control screen anti-blockage capability evaluation experimental device and method, the impact that anti-blockage capability was brought with the formation that reduces or eliminate sand block barrier as far as possible on evaluating sand prevention screen casing itself.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
A kind of sand control screen anti-blockage capability evaluation experimental device, comprising: kettle, mixing component, isocon, wherein,
Described kettle comprises: upper end cover, bottom end cover, sidewall, and the upper end of described upper end cover and described sidewall is connected by dismountable mode, is provided with the first hole on described upper end cover, on described bottom end cover, is provided with liquid outlet, is provided with and adds sand mouth on described kettle;
Described mixing component comprises: paddle, connecting link, coupling lever; Wherein, described paddle comprises: body, blade, hairbrush, and described blade and hairbrush are separately positioned on the both sides of described body, and wherein said hairbrush is positioned at the side near described kettle axis; Described connecting link one end is connected with described paddle, and the other end is connected with described coupling lever; Described coupling lever extend into described kettle inside by described the first bore portion bar section, and described coupling lever inside is provided with fluid passage;
Described isocon inlet end is connected with the one end that is positioned at fluid passage outlet on described coupling lever, and described isocon Way out is towards the body of described paddle.
In a preferred embodiment, described paddle is provided with cavity in body interior, and is provided with near a side of hairbrush the perforate being connected with described cavity at body, and wherein, the cavity openend on described body is connected with the endpiece of described isocon.
In a preferred embodiment, be also provided with admission chamber on described upper end cover, the cavity wall of described admission chamber is provided with inlet, and the entrance of described coupling lever fluid passage is positioned at described admission chamber; Center in described admission chamber upper surface is also provided with the second hole, and described the second hole and the first hole are positioned on same axis, is provided with rotating seal in described the first hole and the second inside, hole, for being sealed and matched of described coupling lever.
In a preferred embodiment, on sand mouth, be also provided with removable cover in described adding.
In a preferred embodiment, described sand control screen anti-blockage capability evaluation experimental device also comprises actuator, and the output terminal of described actuator is connected with one end that described coupling lever stretches out described kettle.
In a preferred embodiment, described connecting link is telescopic expansion link.
In a preferred embodiment, described sand control screen anti-blockage capability evaluation experimental device also comprise for the exemplar plug of the upper end fitted seal of sand control screen exemplar and for the exemplar base (22) of the lower end fitted seal of described sand control screen exemplar.
A kind of sand control screen anti-blockage capability evaluation test method, comprises the following steps:
S1: obtain the permeability K before sand control screen exemplar stops up
1;
S2: described sand control screen exemplar is arranged in described sand control screen anti-blockage capability evaluation experimental device;
S3: the test sand grains preparing was joined in the annular space between kettle and sand control screen exemplar from adding sand mouth of described sand control screen anti-blockage capability evaluation experimental device, open the valve of liquid outlet, start actuator;
S4: the test fluid preparing is injected with constant flow from the inlet of described sand control screen anti-blockage capability evaluation experimental device;
S5: the interval unit interval, from the liquid outlet sampling of described sand control screen anti-blockage capability evaluation experimental device, in the time that described fluid sample does not contain test sand, stop injection test fluid, take out sand control screen exemplar, test the permeability K after its obstruction
2;
S6: adopt index S to evaluate the anti-blockage capability of described sand control screen:
S=K
2/K
1
Wherein, B
1for described sand control screen before stopping up to permeability, B
2for the permeability after described sand control screen exemplar obstruction.
In a preferred embodiment, described test sand grains comprises the silica sand of different-grain diameter scope.
In a preferred embodiment, described test fluid is specially and adopts high molecular polymer and clear water to be mixed with after the solution of 100 milli handkerchief seconds, then adds 5% to 10% bentonitic clay, stirs, standing 3 to 4 hours, formulated.
The features and advantages of the invention are: sand control screen anti-blockage capability evaluation experimental device of the present invention in use, the test fluid isocon of flowing through from the fluid passage of described coupling lever inside, then flow out from described isocon.The test fluid that flow out at described isocon place can flow on body and hairbrush thereof under Action of Gravity Field.Described test fluid flow to after described hairbrush, under the barrier effect of hairbrush and the Action of Gravity Field of test fluid self, can flow on the surface of sand control screen exemplar, thereby the surface of described sand control screen exemplar is had to certain souring.Add in addition at hairbrush and stir and scrub under effect, described test fluid is not easy pile up and stick at the hollow of described sand control screen exemplar periphery and dead angle place, thereby reduce or removed the chance of sand block barrier formation, and then can obtain the anti-blockage capability of described sand control screen itself, the accuracy of warranty test result.The present invention is using a kind of sand control screen anti-blockage capability evaluation test method proposing on the basis of described sand control screen anti-blockage capability evaluation experimental device in addition, and it is simple to operate, and test accurately, can be carried out quantitative evaluation, easy to utilize.
Accompanying drawing explanation
Fig. 1 is sand control screen sand block accuracy detecting device structural drawing in prior art;
Fig. 2 is sand control screen anti-blockage capability evaluation experimental device structural drawing in the embodiment of the present invention;
Fig. 3 is the cut-open view of sand control screen anti-blockage capability evaluation experimental device upper end cover in the embodiment of the present invention;
Fig. 4 is the cut-open view of sand control screen anti-blockage capability evaluation experimental device base in the embodiment of the present invention;
Fig. 5 is the cut-open view of sand control screen anti-blockage capability evaluation experimental device paddle in the embodiment of the present invention;
Fig. 6 is the cut-open view of sand control screen anti-blockage capability evaluation experimental device coupling lever in the embodiment of the present invention;
Fig. 7 is the process flow diagram of sand control screen anti-blockage capability evaluation test method in the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is elaborated, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall in the application's claims limited range the modification of the various equivalent form of values of the present invention.
A kind of sand control screen anti-blockage capability evaluation experimental device is provided in the embodiment of the present invention, and as shown in Figure 2, it comprises: kettle 1, mixing component 3, isocon 4.In a preferred embodiment, described sand control screen anti-blockage capability evaluation experimental device also comprises: exemplar plug 21, exemplar base 22.
Wherein, described kettle 1, entirety can be a circular cylinder body structure, and it comprises: upper end cover 11, bottom end cover 12, sidewall 13.As shown in Figure 3, described upper end cover 11, for being interlocked with the upper surface of the sidewall 13 of described kettle 1, can be circular lid to the upper end cover 11 of described kettle 1 on the whole.The mode that described upper end cover 11 and sidewall 13 fasten is dismountable being tightly connected.The described mode being tightly connected, can arrange O-ring seal for the position coordinating at described upper end cover 11 and sidewall 13.Be provided with and add sand mouth 111 at described kettle 1.Concrete, described in add sand mouth 111 and can be arranged on the upper surface of upper end cover 11.In described adding on sand mouth 111, removable cover 112 can be set.In the time that needs add sand, open described removable cover 112; In the time stopping adding sand, close described removable cover 112.While closing, described removable cover 112 and adding between sand mouth 111 for being tightly connected.On the upper end cover 11 of described kettle 1, be also provided with admission chamber 113.The cavity wall of described admission chamber 113 is provided with inlet 114, can connect outside fluid injection pipeline, for fluid injection by described inlet 114.
In a preferred embodiment, be provided with the first hole 115 at described upper end cover 11 center, be provided with the second hole 116 in addition at described admission chamber 113 center, described the first hole 115 and the second hole 116 are positioned on same axis.In described the first hole 115 and 116 inside, the second hole by rotating seal 5 is set, thereby realize and being sealed and matched of coupling lever 33.
The bottom end cover 12 of described kettle 1, for being interlocked with the lower surface of the sidewall 13 of described kettle 1, can be circular lid on the whole.Described bottom end cover 12 is provided with liquid outlet 121.Described liquid outlet 121 can be the up big and down small funnel type of sectional area on the whole.In the upper port of described liquid outlet 121, be provided with exemplar base 22.Valve 122 is installed in the lower port of described liquid outlet 121.Described valve 122 is for controlling the circulation of liquid.On the lower surface of kettle 1 bottom end cover 12, support 6 can also be set.Described support 6 is for supporting described sand control screen anti-blockage capability evaluation experimental device.
Described exemplar plug 21 is for sealing the upper end of sand control screen exemplar 2.Described exemplar plug 21 seals the upper end of described sand control screen exemplar 2 and specifically can realize by an O-ring seal is upwards set therein in week.Described exemplar plug 21 can be a circular lid on the whole, and the size of the size of described lid and described sand control screen exemplar 2 matches.The size of described exemplar plug 21 along with shown in described sand control screen exemplar 2 sizes variation and change.
Described exemplar base 22 is arranged between described sand control screen exemplar 2 and bottom end cover 12.As shown in Figure 4, described exemplar base 22 can be hollow notch cuttype shaft part on the whole.Described hollow space is communicated with liquid outlet 121.On described notch cuttype shaft part, be provided with the first seal groove 221 and the second seal groove 222.Wherein said the first seal groove 221 is interior by the inwall fitted seal of O-ring seal and described sand control screen exemplar 2 is set.The size of described exemplar base 22 first seal grooves 221 changes along with the variation of described sand control screen exemplar 2 sizes.Described the second seal groove 222 is interior by bottom end cover 12 fitted seal of O-ring seal and described kettle 1 are set.
When use, when sand control screen exemplar 2 be arranged on described kettle 1 interior after, described sand control screen exemplar 2 upper ends are tightly connected by exemplar plug 21, lower end is tightly connected by exemplar base 22.When connection, guarantee that the lower end of described sand control screen exemplar 2 and the liquid outlet 121 of kettle 1 are communicated with.Then filling test sand grains in the annular space between sand control screen exemplar 2 and kettle 1.
Described mixing component 3, is positioned at kettle 1 inside.Described mixing component 3 comprises: paddle 31, connecting link 32, coupling lever 33.
In the annular space of wherein said paddle 31 between sand control screen exemplar 2 and kettle 1.As shown in Figure 5, described paddle 31 comprises: body 310, blade 311, hairbrush 312.The body 310 of described paddle 31 is a U-shaped structure on the whole, and both sides are oar wall.Vertically be provided with blade 311 at described paddle 31 back to a side of described sand control screen exemplar 2.Described blade 311 can evenly be intervally arranged along the oar wall of described paddle 31.Just a side of described sand control screen exemplar 2 is vertically provided with to hairbrush 312 at described paddle 31.The number of described hairbrush 312 is preferably multiple.In use, described hairbrush 312 contacts with described sand control screen exemplar 2 described sand control screen anti-blockage capability evaluation experimental device.
The number of described paddle 31 is at least one.When the number of described paddle 31 is while being multiple, described paddle 31 is uniformly distributed around described coupling lever 33 lower ends.
In a preferred embodiment, the number of described paddle 31 is two, is symmetrically distributed in the both sides of described sand control screen exemplar 2.The upper end of described paddle 31 is connected with one end of described connecting link 32.After described paddle 31 is connected with described connecting link 32, both are in mutual plumbness.
Described connecting link 32 one end are connected with the upper end of described paddle 31, and the other end can be connected with the lower end of described coupling lever 33.The mode that described connecting link 32 is connected with described coupling lever 33 can, for welding, also can be connected described connecting link 32 by jointing is set with coupling lever 33.The quantity of the quantity of described connecting link 32 and described paddle 31 matches.Described connecting link 32 can be one, also can be many.In the time that described connecting link 312 is many, described connecting link 32 is uniformly distributed around coupling lever 33 lower ends.When in the preferred embodiment of the invention, when the number of described paddle 31 is two, described connecting link 32 also can correspondence be set to two.
Described connecting link 32 can be the expansion link 32 that length can be carried out according to the size of described sand control screen exemplar 2 external diameters corresponding adjusting in a preferred embodiment.When described sand control screen exemplar 2 external diameters are when larger, described expansion link 32 is corresponding is adjusted to longer state; When described sand control screen exemplar 2 external diameters hour, described expansion link 32 is corresponding is adjusted to shorter state.In the time that described expansion link 32 regulates length, drive the paddle 31 being attached thereto to do corresponding mobile, make the position of described paddle 31 do corresponding adjusting, thereby adapt to the sand control screen exemplar 2 of different-diameter.
The lower end of described coupling lever 33 is connected with one end of described connecting link 32, and the upper end cover 11 that the other end passes described kettle 1 is connected with the output terminal of actuator 34.In the preferred embodiment of the invention, described actuator 34 is preferably motor.Described coupling lever 33, in the time coordinating with described upper end cover 11, through the admission chamber 113 on upper end cover 11, and is tightly connected by rotating seal 5 and admission chamber 113.As shown in Figure 6, its inside has fluid passage 331 to the concrete structure of described coupling lever 33.331 tops, described fluid passage are provided with entrance 332.Described entrance 332 is positioned at admission chamber 113.The bottom of described fluid passage 331 is provided with outlet 333.The quantity of described outlet 333 can be one, can be also multiple.When the quantity of described outlet 333 is while being multiple, described outlet 333 is uniformly distributed around coupling lever 33 lower ends, and each outlet 333 connects an isocon 4, the corresponding paddle 31 of each root isocon 4.In the time that the quantity of described paddle 31 is two, the quantity of described outlet 333 is also two.Described outlet 333 is positioned at admission chamber 113 outer, kettlies 1.
Described isocon 4, is positioned at kettle 1 inside.Described isocon 4 inlet ends are connected with the outlet 333 of the fluid passage 331 of coupling lever 33.Described isocon 4 Way outs are towards the body 310 of described paddle 31.When the test fluid isocon 4 of flowing through from the fluid passage 331 of described coupling lever 33 inside, then while flowing out from described isocon 4, the test fluid that flow out at described isocon 4 places is because Action of Gravity Field can flow on body 310 and hairbrush 312 thereof.Described test fluid flow to after described hairbrush 312, and under the barrier effect and self gravitation effect of hairbrush 312, described test fluid can flow on the surface of sand control screen exemplar 2.Described test fluid flows to behind the surface of sand control screen exemplar 2, the surface of described sand control screen exemplar 2 is had to certain souring, and stir and scrub under effect at hairbrush 312, described test fluid is not easy pile up and stick at the hollow of described sand control screen exemplar 2 peripheries and dead angle place, can reduce or remove the sand block barrier that its periphery may form.
In a preferred embodiment, as shown in Figure 5, the middle part of described paddle 31 bodies 310 is provided with cavity 313.Described paddle 31 is just vertically also provided with perforate 314 to sand control screen exemplar 2 one sides.The number of described perforate 314 is at least one.Described perforate 314 is communicated with described cavity 313.Described perforate 314 is positioned on the position that homonymy is adjacent with described hairbrush 312.The endpiece of described isocon 4 is connected with cavity 313 openends of described paddle 31.When the described test fluid isocon 4 of flowing through from the fluid passage 331 of described coupling lever 33 inside, then while flowing out from described isocon 4, the test fluid that flow out at described isocon 4 places flows in the cavity 313 of body 310, then flows out from described perforate 314.The test fluid flowing out from described perforate 314 can inject directly on the surface of described sand control screen exemplar 2.Under the jet action of described fluid, described test fluid is not easy pile up and stick at the hollow of described sand control screen exemplar 2 peripheries and dead angle place, thereby can reduce better or remove the sand block barrier that described sand control screen exemplar 2 peripheries may form.
In the preferred embodiment of the invention, described isocon 4 is processed by rubber hose.The quantity of described isocon 4 can be one, also can be many.In the time that the quantity of described isocon 4 is many, described many isocons 4 are uniformly distributed around coupling lever 33 lower ends.The quantity of the quantity of described isocon 4 and described outlet 333 matches, and in the time that the quantity of described outlet 333 is two, the quantity of described isocon 4 is also two.
In the time that described sand control screen anti-blockage capability evaluation experimental device uses: add the removable cover 112 on sand mouth 111 described in opening, add test sand grains from adding sand mouth 111, be filled in the annular space between sand control screen exemplar 2 and kettle 1.Described test sand grains refers to and adopts the quartz sand particle of different-grain diameter scope according to the test sand grains of certain ratio mixed preparing.Start described electric machine rotation; Along with the rotation of described motor, drive the coupling lever 33 connecting with it to rotate; By the rotation of described coupling lever 33, drive the connecting link 32 being attached thereto to rotate; By the rotation of described connecting link 32, drive the paddle 31 being attached thereto around the circumferential rotation of the periphery of sand control screen exemplar 2.Described paddle 31 can be piled up the sand block layer forming by failure test sand grains around the circumferential rotation of the periphery of sand control screen exemplar 2, and making to test sand grains can fully contact with gap or the duct of sand control screen exemplar 2.The outer field blade 311 of paddle 31 is for the test sand grains of fully stirring.The hard fibre hairbrush 312 of paddle 31 inner sides is for cleaning the test sand grains that is deposited in sand control screen exemplar 2 surfaces.
Test fluid enters admission chamber 113 from described inlet 114 in addition, enter different isocon 4 from the fluid passage 331 of coupling lever 33 inside again, from isocon 4, enter in the cavity 313 of paddle 31, finally ejection from perforate 314, is injected in sand control screen exemplar 2 surfaces.Described test fluid tests slurry, refers to the clay polymkeric substance slurry formulated by water, high molecular polymer and bentonitic clay.Wherein said high molecular polymer is for the gum asphalt of Simulation of Crude Oil, and described bentonitic clay is used for replacing clay shale.
Test because sand control screen anti-clogging experiment adopts quartz sand particle and test fluid, the polymkeric substance in described quartz sand particle material and test fluid is easily attached on the surface of sand control screen exemplar 2, forms sand block layer.If be difficult to remove the sand block layer on described sand control screen exemplar 2 surfaces with simple hard fibre hairbrush 312.Particularly, for some screen casing exemplar, as elastic screen, its surperficial special construction cleans less than particulate matter and the polymkeric substance of piling up and be attached on hollow place hard fibre hairbrush 312.Now due to can be from perforate 314 in the preferred embodiment of the present invention ejecting fluid, pile up and be attached on particulate matter and the polymkeric substance that the described hard fibre hairbrush 312 at dead angle place does not reach thereby can clean, and then can guarantee to remove preferably the sand block layer on described sand control screen exemplar 2 surfaces, guarantee the accuracy of test result.
A kind of sand control screen anti-blockage capability test evaluation method is provided in the embodiment of the present invention, as shown in Figure 7, has comprised the following steps:
S1: obtain the permeability K before sand control screen exemplar stops up
1;
S2: described sand control screen exemplar is arranged in described sand control screen anti-blockage capability evaluation experimental device;
S3: the test sand grains preparing was joined in the annular space between kettle and sand control screen exemplar from adding sand mouth of described sand control screen anti-blockage capability evaluation experimental device, open the valve of liquid outlet, start actuator;
S4: the test fluid preparing is injected with constant flow from the inlet of described sand control screen anti-blockage capability evaluation experimental device;
S5: the interval unit interval, from the liquid outlet sampling of described sand control screen anti-blockage capability evaluation experimental device, in the time that described fluid sample does not contain test sand, stop injection test fluid, take out sand control screen exemplar, test the permeability K after its obstruction
2;
S6: adopt index S to evaluate the anti-blockage capability of described sand control screen:
S=K
2/Ｋ
1
When concrete operations, can first intercept a bit of sand control screen exemplar 2 that comprises complete filter element from a complete sand control screen, if the sand control screen being intercepted is provided with guard shield, needs described guard shield to remove, then sand control screen exemplar 2 two ends are polished smooth.
Obtaining after described sand control screen exemplar 2, can further test the permeability K before the obstruction of described sand control screen 2
1.
As the permeability K recording before described sand control screen exemplar 2 stops up
1after, described sand control screen exemplar 2 is arranged on described sand control screen anti-blockage capability evaluation experimental device.When concrete installation, first described sand control screen exemplar 2 and the exemplar base 22 on described sand control screen anti-blockage capability evaluation experimental device are tightly connected; And then exemplar plug 21 is arranged on to the upper end of described sand control screen exemplar 2; Then exemplar base 22 is arranged on the bottom end cover 12 of kettle 1; Regulate the length of connecting link 32, hard fibre hairbrush 312 and described sand control screen exemplar 2 surfaces are kept in touch; Finally install the upper end cover 11 of kettle 1.
In addition, can adopt the silica sand of different-grain diameter scope according to certain ratio mixed preparing test sand grains.Described test sand grains can comprise: particle size range is the coarse sand of 0.5 millimeter to 1.0 millimeters, particle size range is the medium sand of 0.25 millimeter to 0.5 millimeter, particle size range is the fine sand of 0.1 millimeter to 0.25 millimeter, particle size range is the coarse silt of 0.05 millimeter to 0.1 millimeter, and particle size range is the fine silt of 0.01 millimeter to 0.05 millimeter.The ratio of described various test sand grains is all identical.Particle diameter (millimeter) scope and the ratio of described test sand grains are as shown in table 1:
Table 1
| Grade is divided | Coarse sand | Medium sand | Fine sand | Coarse silt | Fine silt |
| Particle size range | 0.5～1.0 | 0.25～0.5 | 0.1～0.25 | 0.05～0.1 | 0.01～0.05 |
| Ratio | 1 | 1 | 1 | 1 | 1 |
The described test sand grains preparing is joined in the annular space between kettle 1 and sand control screen exemplar 2 from add sand mouth 111, and open the valve 122 of liquid outlet 121; Starter motor, makes paddle 31 rotate in a circumferential direction around the periphery of sand control screen exemplar 2.
The present invention is also by adopting high molecular polymer and clear water to be mixed with the solution of 100 milli handkerchief seconds in addition, then adds 5% to 10% bentonitic clay, stirs, and standing 3 to 4 hours, is mixed with test fluid.Wherein said high molecular polymer is for the gum asphalt of Simulation of Crude Oil, and bentonitic clay is used for replacing clay shale.
Test the permeability K after described sand control screen exemplar 2 stops up
2time, from inlet 114 with constant flow injection test fluid, the interval unit interval, samples from liquid outlet 121, with the filtration of detailed catalogue testing sieve, observe in the fluid flowing out and whether test in addition sand grains, if not containing test sand, stop injection test fluid in the fluid flowing out, open the upper end cover 11 of described kettle 1, take out sand control screen exemplar 2, test the permeability K after described sand control screen exemplar 2 stops up
2;
Adopt index S to carry out the anti-blockage capability of evaluating sand prevention screen casing:
S=Ｋ
2/Ｋ
1
Wherein, K
1for the permeability before the obstruction of described sand control screen 2 (darcy), K
2for the permeability (darcy) after described sand control screen exemplar 2 obstructions; Described S value is larger, shows that the anti-blockage capability of sand control screen is better.
Sand control screen anti-blockage capability evaluation experimental device of the present invention in use, the test fluid isocon 4 of flowing through from the fluid passage 331 of described coupling lever 33 inside, then flow out from described isocon 4.The test fluid that flow out at described isocon 4 places can flow on body 31 and hairbrush 312 thereof under Action of Gravity Field.Described test fluid flow to after described hairbrush 312, under the barrier effect of hairbrush 312 and the Action of Gravity Field of test fluid self, can flow on the surface of sand control screen exemplar 2, thereby the surface of described sand control screen exemplar 2 is had to certain souring.Add in addition at hairbrush 312 and stir and scrub under effect, described test fluid is not easy pile up and stick at the hollow of described sand control screen exemplar 2 peripheries and dead angle place, thereby reduce or removed the chance of sand block barrier formation, and then can obtain the anti-blockage capability of described sand control screen itself, the accuracy of warranty test result.
The present invention is using a kind of sand control screen anti-blockage capability evaluation test method proposing on the basis of described sand control screen anti-blockage capability evaluation experimental device in addition, and it is simple to operate, and test accurately, can be carried out quantitative evaluation, easy to utilize.
The foregoing is only several embodiments of the present invention, although the disclosed embodiment of the present invention as above, the embodiment that described content just adopts for the ease of understanding the present invention, is not intended to limit the present invention.Any those skilled in the art; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can in the formal and details of embodiment, do any modification and variation; but scope of patent protection of the present invention, still must be as the criterion with the scope that appended claims was defined.
Claims (10)
1. a sand control screen anti-blockage capability evaluation experimental device, is characterized in that, comprising: kettle, mixing component, isocon, wherein,
Described kettle comprises: upper end cover, bottom end cover, sidewall, and the upper end of described upper end cover and described sidewall is connected by dismountable mode, is provided with the first hole on described upper end cover, on described bottom end cover, is provided with liquid outlet, is provided with and adds sand mouth on described kettle;
Described mixing component comprises: paddle, connecting link, coupling lever; Wherein, described paddle comprises: body, blade, hairbrush, and described blade and hairbrush are separately positioned on the both sides of described body, and wherein said hairbrush is positioned at the side near described kettle axis; Described connecting link one end is connected with described paddle, and the other end is connected with described coupling lever; Described coupling lever extend into the inside of described kettle by described the first bore portion bar section, described coupling lever inside is provided with fluid passage;
Described isocon inlet end is connected with the one end that is positioned at fluid passage outlet on described coupling lever, and described isocon Way out is towards the body of described paddle.
2. a kind of sand control screen anti-blockage capability evaluation experimental device as claimed in claim 1, it is characterized in that: described paddle is provided with cavity in the inside of body, and be provided with near a side of hairbrush the perforate being connected with described cavity at body, wherein, the cavity openend on described body is connected with the endpiece of described isocon.
3. a kind of sand control screen anti-blockage capability evaluation experimental device as claimed in claim 1, it is characterized in that: on described upper end cover, be also provided with admission chamber, the cavity wall of described admission chamber is provided with inlet, and the entrance of described coupling lever fluid passage is positioned at described admission chamber; Center in described admission chamber upper surface is also provided with the second hole, and described the second hole and the first hole are positioned on same axis, is provided with rotating seal in described the first hole and the second inside, hole, for being sealed and matched of described coupling lever.
4. a kind of sand control screen anti-blockage capability evaluation experimental device as claimed in claim 1, is characterized in that: on sand mouth, be also provided with removable cover in described adding.
5. a kind of sand control screen anti-blockage capability evaluation experimental device as claimed in claim 1, is characterized in that: also comprise actuator, the output terminal of described actuator is connected with one end that described coupling lever stretches out described kettle.
6. a kind of sand control screen anti-blockage capability evaluation experimental device as claimed in claim 1, is characterized in that: described connecting link is telescopic expansion link.
7. a kind of sand control screen anti-blockage capability evaluation experimental device as claimed in claim 1, is characterized in that: also comprise for the exemplar plug of the upper end fitted seal of sand control screen exemplar and for the exemplar base of the lower end fitted seal of described sand control screen exemplar.
8. a sand control screen anti-blockage capability evaluation test method, is characterized in that, comprises the following steps:
S1: obtain the permeability K before sand control screen exemplar stops up
1;
S2: described sand control screen exemplar is arranged in described sand control screen anti-blockage capability evaluation experimental device;
S3: the test sand grains preparing was joined in the annular space between kettle and sand control screen exemplar from adding sand mouth of described sand control screen anti-blockage capability evaluation experimental device, open the valve of liquid outlet, start actuator;
S4: the test fluid preparing is injected with constant flow from the inlet of described sand control screen anti-blockage capability evaluation experimental device;
S5: the interval unit interval, from the liquid outlet sampling of described sand control screen anti-blockage capability evaluation experimental device, in the time that described fluid sample does not contain test sand, stop injection test fluid, take out sand control screen exemplar, test the permeability K after its obstruction
2;
S6: adopt index S to evaluate the anti-blockage capability of described sand control screen:
S=K
2/K
1
Wherein, K
1for the permeability before described sand control screen obstruction, K
2for the permeability after described sand control screen exemplar obstruction.
9. a kind of sand control screen anti-blockage capability evaluation test method as claimed in claim 8, is characterized in that: described test sand grains is specially the silica sand of different-grain diameter scope.
10. a kind of sand control screen anti-blockage capability evaluation test method as claimed in claim 8, it is characterized in that: described test fluid is specially and adopts high molecular polymer and clear water to be mixed with 100 in the least after the solution of handkerchief second, add again 5% to 10% bentonitic clay, stir, leave standstill 3 to 4 hours, formulated.
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