CN106223928A - A kind of back-up sand method of multilateral well experimental model - Google Patents

A kind of back-up sand method of multilateral well experimental model Download PDF

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Publication number
CN106223928A
CN106223928A CN201610693430.5A CN201610693430A CN106223928A CN 106223928 A CN106223928 A CN 106223928A CN 201610693430 A CN201610693430 A CN 201610693430A CN 106223928 A CN106223928 A CN 106223928A
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experimental model
sand
multilateral well
water
model
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CN106223928B (en
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韩国庆
吴晓东
朱明�
安永生
高慎帅
张睿
曹光朋
范卫潮
高飞
徐立坤
张田
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China University of Petroleum Beijing CUPB
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China University of Petroleum Beijing CUPB
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Priority to CN201210180178.XA priority patent/CN102704911B/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20Displacing by water
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/06Measuring temperature or pressure
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

The present invention is a kind of back-up sand method about multilateral well experimental model, and described back-up sand method comprises the following steps: mixed according to the ratio uniform of 4:1 with clay by fine sand;The dry method filled out is used to insert in experimental model by mixed fine sand and clay mixture and be compacted;Described experimental model is filled to water saturation;Use white oil saturated to oil to described experimental model expelling water.Embodiment of the present invention method utilize clay water-swellable performance can the sandpack column of relatively low-permeability, and saturated oils method can form irreducible water, more approximates true oil reservoir.

Description

A kind of back-up sand method of multilateral well experimental model
The application is filing date on 06 01st, 2012, Application No. 201210180178.X, invention entitled " one Multilateral well experimental model, system and back-up sand method " the divisional application of Chinese patent application.
Technical field
The present invention is about multilateral well physical simulation techniques field, specifically about a kind of multilateral well experiment mould The back-up sand method of type.
Background technology
Multilateral well refers to that hole angle reaches or close to 90 °, well bore creeps into the well of certain length along horizontal direction.Many points The well of Zhi Jing is a horizontal-extending considerably long segment length in oil reservoir, and sometimes for the needs that certain is special, hole angle can surpass Cross 90 °.In general, multilateral well is applicable to thin oil-gas Layer or fractured reservoirs, it is therefore intended that increase the naked of oil-gas Layer Show up long-pending.
Multilateral well physical simulation techniques is to utilize the experimental provision in laboratory to simulate the true feelings of multilateral well oil reservoir The physical simulation experiment technology of condition, multilateral well physical simulation techniques can be exploited at experiment indoor observation multilateral well oil reservoir Physical phenomenon in journey, quiet, the dynamic parameter of test oil reservoir, analyze multilateral well seepage flow characteristics, mechanism of oil displacement, contrast is with preferred Injection-production technology.
In multilateral well physical simulation techniques, multilateral well physical model is the base of multilateral well physical simulation experiment Plinth.According to different research purposes, multilateral well physical model can be divided into two big classes, i.e. Basic Mechanism study model and ratio Model.The former can not to scale (NTS) manufacture, can simulate a unit or a process, the mechanism of research physical phenomenon, it is fixed to be given The understanding of property;The latter then designs according to the principle of similitude, geometric similarity to be met, motion phase between model with prototype in principle Sihe dynamic similarity, experimental implementation, data process and the application of experimental result will complete under the guidance of the theory of similarity.Mesh Before, multilateral well physical modeling's model both domestic and external and experiment, can be divided mainly into following four classes: Static Electro analogue model and reality Test, dynamic one-dimensional physical modeling's model and experiment, Dynamic Two-dimensional physical modeling's model and experiment and dynamic 3 D physical modeling's mould Type and experiment.
Multilateral well dynamic 3 D physical modeling, compared with electrical analogue, one-dimensional physical modeling, two-dimensional physical simulation, has aobvious The advantage write, it can reflect reality the dynamic change of oil reservoir more really, can simulate complicated geological feature, complicated completion work Skill, the multilateral well Production development under complicated mining type, is the important means of multilateral well withdrawal mechanism research.With one-dimensional, Two dimension dynamic physical model is compared, and all multiparameters that the most only 3 d scale model can realize controlling physical process are carried out comprehensively Quantitative analysis, thus propose to predict more accurately to down-hole oil reservoir development trend, and the above two are more focused on qualitative investigation.
In prior art, multilateral well three-dimensional physical simulation assay device has three dimensions, and it is the angle mould from space Intend reality multilateral well oil reservoir.Relevant multilateral well dynamic 3 D physical modeling, Chinese scholars has done a lot of this respect Research.At present, threedimensional model is broadly divided into the scale model designed in proportion and the non-model designed in proportion, the former research Comparative maturity that is more with application, that also develop.
Dynamic 3 D scale model is typically for the scene concrete DP technology of concrete oil reservoir, by the theory of similarity instruct by than Example designs.What is called designs in proportion, it is simply that refer in laboratory scale by prototype oil field according to a set of similarity criterion by Reduced-scale makes physical model.Generally geology reservoir is different, and the emphasis of simulation study is different, sets up model The similarity criterion of foundation is the most different.
But, compared with first three analog, multilateral well three-dimensional physical simulation device has a disadvantage in that volume is huge Greatly, structure is complicated, cost intensive, and experiment flow is complicated loaded down with trivial details and must debug in advance, provisioned various temperature, pressure, stream Quantity sensor not only quantity is many but also requires height.
Fig. 1 is an experimental provision schematic diagram in prior art, as it is shown in figure 1, experimental provision uses hydraulic pressurization simulation ground Layer burden pressure;Upper part simulation oil reservoir, lower part simulation bottom water, separate with bottom water diffuser screen between two parts, simulation is unlimited Equipotential surface under water conservancy diversion state;Blood circulation have employed the stainless steel capillary of external diameter 3mm internal diameter 1.5mm, provide to model During little flow velocity, fluid can consume the biggest flow resistance by capillary tube, makes model obtain stable small pressure feed.Penetrate Collimation method measures the principle of bottom water lifting height, the position that ray raises, and water level raises.Due to model during profit saturation difference Different to the degree of ray attenuation, so can according to the change of the fuel-displaced water saturation of transmitted intensity measure of the change in the plane, And go out, by formula to calculating, the height that bottom water rises.
In the experimental provision shown in Fig. 1, oil reservoir macroscopic view homogenizing in model;Initial water layer and oil reservoir are clearly distinguished;Open During Faing, water is entirely from bottom water, boundless water.But owing to this technology have employed radioactive source to judge that profit saturation changes With bottom water lifting height, therefore there are the following problems: can not simulating reality oil reservoir completely.Only use gauge measurement inlet Pressure, it is impossible to monitoring multilateral well nearly well pressure field distribution, and then the inflow profile of varying level section can not be judged, thus can not Simulating reality oil reservoir completely;There is potential safety hazard.Have employed radioactive source to judge profit saturation change and bottom water lifting height, This needs the most sound protective measure and working specification, once misoperation, it will cause the most serious consequence;Data acquisition Not science.Gathering data mode is artificial collection, when multilateral well starts water breakthrough, needs to be spaced comparatively short time reading once Data on flows, workload is bigger;Multilateral well well type is single.Only simulate branchiess multilateral well exploitation bottom water reservoir, Without reference to multilateral well, well type is single.
Fig. 2, Fig. 3 are physical model schematic diagram and the experiment process figure of an experimental provision in prior art respectively, as Fig. 2, Shown in Fig. 3, the physical model a size of 30cm × 25cm of closed boundary low-permeability oil deposit multilateral well level pressure Mining Test flow process ×5cm.First the physical model leak test will made, it is ensured that in the case of there is not leakage, evacuation saturated formation water, use High-precision measuring infusion formation water displacement physical model, is allowed to add certain pressure by the formation water in compact model, this Secondary test pressurization 0.235MPa.Calibrating (base measuring) pressure sensor, logging and electronic balance, and by logging and electronic balance signal Line is connected on computer, so that the automatic collection of test data.
Analogue technique shown in Fig. 2, Fig. 3 uses hyposmosis natural sandstone to appear, and is packaged with resin, although meet The requirement of low-permeability, but due to the particularity of its physical model and the dispersibility of measuring point, cause this technology there is also with Lower shortcoming: oil reservoir can not be accurately reflected.This technology relatively the first technology has had great progress in terms of monitoring reservoir pressure distribution, Have employed 15 measuring point monitoring pressure field distributions, but owing to measuring point excessively disperses, final pressure profile is not accurate enough;Can not Situation in the presence of simulation bottom water, limit water.Appear owing to using hyposmosis natural sandstone, and encapsulated with resin, Closed boundary can only be simulated, it is impossible to simulation limit, bottom water;Multilateral well well type is single.
In general, in prior art, there are the following problems for dynamic 3 D scale model:
The back-up sand experiment of prior art can only be to multiple-limb well capacity and go out liquid rule over time and carry out physics Simulation, it is impossible to the pressure field distribution of the internal nearly well of measurement model, it is impossible to reflect the pressure of oil reservoir in whole recovery process more truly Power Changing Pattern;
In the multilateral well back-up sand experiment of prior art, the border that can simulate only has bottom water boundary, it is impossible to simulation waterside, limit Boundary;
In the multilateral well back-up sand experiment of prior art, the multilateral well production capacity not having branch can only be simulated, nothing Multilateral well production capacity is simulated by method;
In the multilateral well back-up sand experiment of prior art, the collection of data mostly is artificial collection, the most artificial or by Computer disposal, such result causes inefficiency, error to increase often;
The displacement process of the multilateral well back-up sand experiment of prior art there will be " water breakthrough " phenomenon, make moisture content drastically go up Rise;
In prior art, manual method is difficult to make the sandpack column of low-permeability.
Summary of the invention
The problem making the sandpack column of low-permeability for overcoming manual method in prior art to be difficult to, the present invention provides one Planting the back-up sand method of multilateral well experimental model, the back-up sand method of described multilateral well experimental model is specifically achieved in that
A kind of back-up sand method of multilateral well experimental model, described back-up sand method comprises the following steps:
Fine sand is mixed according to the ratio uniform of 4:1 with clay;
The dry method filled out is used to insert in experimental model by mixed fine sand and clay mixture and be compacted;
Described experimental model is filled to water saturation;
Use white oil saturated to oil to described experimental model expelling water.
Optionally, in one embodiment of the invention, described white oil viscosity when 25 DEG C is 115mPa s.
Optionally, in one embodiment of the invention, described fine sand is 200 mesh fine sands.
Optionally, in one embodiment of the invention, the dry method filled out of described employing is by mixed fine sand and clay Mixture is inserted in experimental model and is compacted include:
By mixed fine sand and clay mixture according to successively back-up sand, the mode that is successively compacted is dry is filled to experimental model In.
The back-up sand method of the multilateral well experimental model that the present invention provides, it is possible to use the performance of clay water-swellable obtains The sandpack column that permeability is relatively low, and when the ratio of fine sand Yu clay is 4:1, the permeability of described laboratory is minimum.Utilize White oil carries out expelling water to the most saturated to experimental model, can form irreducible water, be closer to true oil reservoir in experimental model.Cause This, the present invention uses back-up sand that specific proportions mixes and generates the sandpack column that permeability that oil saturation process obtains is relatively low, makes Obtaining experimental model and more approach oil reservoir truth, the success for experiment is laid a good foundation.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is an experimental provision schematic diagram in prior art.
Fig. 2 is a physical model schematic diagram in prior art.
Fig. 3 is an experiment process schematic diagram in prior art.
Fig. 4 is the structure chart of a kind of multilateral well experimental model that the embodiment of the present invention provides.
Fig. 5 is the structure chart of a kind of multilateral well experimental model that the embodiment of the present invention provides.
Fig. 6 is the multilateral well model well type design drawing that the embodiment of the present invention provides.
Fig. 7 is the experimental model profile that the embodiment of the present invention provides.
Fig. 8 is a kind of multilateral well experimental system structure chart that the embodiment of the present invention provides.
Fig. 9 is a kind of pressure sensor device structure chart that the embodiment of the present invention provides.
Figure 10 is a kind of multilateral well experimental model back-up sand method flow diagram that the embodiment of the present invention provides.
Figure 11 is a kind of multilateral well experimental model anti-water breakthrough method flow diagram that the embodiment of the present invention provides.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, right The present invention is described in further details.Here, the exemplary embodiment of the present invention and explanation thereof are used for explaining the present invention, but also Not as a limitation of the invention.
The embodiment of the present invention provides a kind of multilateral well experimental model, system and back-up sand method, below in conjunction with accompanying drawing to this Invention is described in detail.
Embodiment one
Fig. 4 is the structure chart of a kind of multilateral well experimental model that the embodiment of the present invention provides, as shown in Figure 4, multiple-limb Experiment sand is filled on the top 401 of well experimental model 400, and the bottom 402 of described experimental model is used for filling bottom water, and described is upper Being provided with a bottom water diffuser plate 403 between lower two parts, (figure is not to be provided with warp layer net between described bottom water diffuser plate and top Show).
In embodiments of the present invention, multilateral well experimental model 400 can be a square container, can bear inside it The high pressure of 12MPa.Multilateral well experimental model is divided into upper and lower two parts, and top 401 back-up sand simulation oil reservoir, the end is simulated in bottom 402 Water, separates with bottom water diffuser plate 403 between two parts, and bottom water diffuser plate 403 bedding warp layer net above, in order to prevent top Sand drops to bottom, and simulates equipotential surface, the state of infinite fluid diversion.
In embodiments of the present invention, the experiment sand that top 401 is filled is mixed to be made into by fine sand (200 mesh) and clay simulates Stratum, the fine sand of different proportion can get different permeabilities from the mixture of clay.In this technique, test through great many of experiments Card fine sand and clay optimum mixture ratio example are 4:1, and the permeability of experiment sand is 33 × 10-3μm2
In experimentation, first have to a fine sand and mix homogeneously according to optimal proportion with clay, then use the dry method filled out Carrying out back-up sand, carry out the work of saturation water after back-up sand, with the white oil of particular viscosity, (when 25 DEG C, white oil viscosity is the most again 115mp s) driven water-replacing to oil saturated.The method utilize clay water-swellable performance can the sandpack column of relatively low-permeability, And saturated oils method can form irreducible water, more approximates true oil reservoir.
In embodiments of the present invention, experimental model internal face is coated with an anti-water breakthrough coating, and anti-water breakthrough coating is by low molecule Polyamide and epoxy resin mix, and described low molecule pa resin and the ratio of epoxy resin are 3:5, waterproof The surface altering coating can cover one layer of fine sand.
Fig. 7 is the experimental model profile that the embodiment of the present invention provides, as it is shown in fig. 7, owing to the smooth meeting of model wall is led Cause water in displacement process prolong hydraulically smooth surface alter into, make multilateral well shift to an earlier date water breakthrough, moisture content steeply rises, and have impact on experiment knot Really.Therefore in view of the impact of " water breakthrough ", use epoxy resin that hydraulically smooth surface is processed, increase the roughness of wall.First First allocate epoxy resin, low molecule pa resin is mixed with epoxy resin 3:5 in proportion.Then hydraulically smooth surface is entered Row uniform application, then fine sand is covered on its surface, finally carry out drying and processing, to increase the roughness of wall.(note: epoxy The allotment of resin, the process of smearing need band canister respirator).
Fig. 5 is the structure chart of a kind of multilateral well experimental model that the embodiment of the present invention provides, as it is shown in figure 5, with Fig. 4 institute Experimental model 400 difference shown is, the inwall of experimental model 500 is provided with multiple limits Fluid Dynamics unit 404.
In embodiments of the present invention, the internal face of experimental model 500 is provided with two each and every one limit Fluid Dynamics unit 404, Limit Fluid Dynamics unit 404 is the bored tube of annular, and wherein aperture is uniformly distributed, tubule surface parcel gauze, ring pipe Diameter can be 4mm, and the diameter of apopore can be 0.5mm.In experimentation, can protect with opposite side Fluid Dynamics unit 404 water filling Demonstrate,prove the uniform water outlet of each aperture, thus realize simulating limit water.
In embodiments of the present invention, as it is shown in figure 5, be provided with a multilateral well model in the top 401 of experimental model 500 405, multilateral well model 405 is positioned at above probe at about 2cm, and toe-end is away from model inwall 5cm, and heel end is connected with wall.
Fig. 6 is the multilateral well model well type design drawing that the embodiment of the present invention provides, as shown in Figure 6, multilateral well model For multilateral well model, including main hole and at least one branch, it is also possible to Shi Liang branch, three branches or four branches, branch can To be distributed in homonymy or the heteropleural of main hole, it is also possible to (different) side continuous distribution, with spaced apart and symmetrical point of (different) side Cloth etc..Each branch can be 15 °, 30 °, 45 °, 60 °, 75 ° or 90 ° with the angle of main hole.
A kind of multilateral well experimental model that the embodiment of the present invention provides, simulates oil reservoir effectively, and limit, bottom water are to many points Prop up well capacity and the impact of nearly well pressure field distribution, make simulation closer to the bottom water in true reservoir media, Bian Shui, closing etc. Multiple different boundary, thus obtain the impact on oil well productivity of the different boundary conditions.
Effectively simulate multiple-limb, many well type multiple-limb well capacity and enter well pressure field distribution, being appreciated that many points The impact on multilateral well exploitation different boundary oil reservoir of the geometrical factor of Zhi Jing, provides theory for multilateral well well type optimization and depends on According to.
Effectively prevent " water breakthrough ", and use special back-up sand and saturation process to make the back-up sand mould of relatively low-permeability Type, makes simulation more approach oil reservoir truth, and the success for experiment is laid a good foundation.
Embodiment two
Fig. 8 is a kind of multilateral well experimental system structure chart that the embodiment of the present invention provides, as shown in Figure 8, multilateral well Experimental system 800 includes:
Multilateral well experimental model 801, in embodiments of the present invention, multilateral well experimental model 801 can be embodiment Multilateral well experimental model 400 or 500 described in one.
Pressure sensor device 802, is connected with multilateral well experimental model 801, is used for sensing multilateral well experimental model 801 The pressure of interior diverse location, generates voltage signal.
Data processing equipment 803, is connected with pressure sensor device 802, is used for receiving voltage signal, generates analog result number According to.In embodiments of the present invention, data processing equipment 803 can receive the voltage signal that pressure sensor device 802 transmits, and will Voltage signal is converted into pressure and shows, the data of all acquisitions can Auto-Memory, it is simple to post processing.
In embodiments of the present invention, multilateral well experimental system has introduced " multilateral well nearly well flow simulating software system System ", it is achieved the acquisition process of data.This system includes that operating system, data show, real-time curve, data readback, curve return Put, six parts such as proving operation.The major function of operating system is to beat serial ports between opening/closing and sensor, it is achieved signal Transmission, conversion, be automatically converted to pressure signal by the voltage signal of reception;Data display unit major function shows collection Real time data, pressure distribution and voltage signal;Real-time curve part mainly shows the pressure of each measuring point in whole experimentation Change curve;Data readback and curve playback section major function are that the data gathered, image are carried out preservation process;Demarcate behaviour The Main Function made determines that the transformational relation between voltage signal and pressure signal, it is achieved the automatic conversion between signal.
Fig. 9 is a kind of pressure sensor device structure chart that the embodiment of the present invention provides, as it is shown in figure 9, pressure sensor device 802 may include that
Pressure sensing cells 901, the pressure signal of diverse location in gathering experimental model, in experimentation, sensing Device can experience the pressure signal of the internal diverse location of model.In embodiments of the present invention, pressure sensor device 802 can include 49 Individual pressure sensing cells 901.
Demarcate unit 902, for storing the transformational relation information between pressure signal and voltage signal, before experiment, first First suppress with caliberating device and demarcate.The purpose suppressed is to ensure that each pressure sensing cells 901 normally works;Demarcate Purpose determines that the transformational relation of pressure signal and voltage signal.
Voltage conversion unit 903, for being converted to described voltage signal by described pressure signal and exporting.
The multilateral well experimental system that the embodiment of the present invention provides simulates oil reservoir effectively, uses pressure capsule system to become Merit achieves the real-time measurement of multilateral well nearly well pressure field distribution, and the pressure distribution recorded is more accurate.For research multilateral well Pressure field distribution around, thus explore bottom water coning position and delay the approaches and methods of bottom water coning, and open for science Adopt multilateral well bottom water reservoir and provide foundation.
Data processing equipment is used to dock with pressure sensor device, can be with timely monitor model inside measuring point pressure;Display Nearly well pressure field pattern, and real-time snap shot;Gather the data Auto-Memory obtained.Stimulated the menstrual flow the nearly well pressure to multilateral well The process of force data obtains its nearly well pressure scattergram, and then obtains oil-water two-phase flow rule and rule of waterflooding.It is greatly improved Conventional efficient, for later larger logistics organizations, the simulation of more complicated reservoir condition is had laid a good foundation.
Embodiment three
A kind of multilateral well experimental model limit Fluid Dynamics device, described limit Fluid Dynamics device is arranged at described experimental model Inwall on, described limit Fluid Dynamics device be parcel gauze ring pipe, a diameter of 4mm of described ring pipe, described On ring pipe all be dispersed with multiple apopore, a diameter of 0.5mm of described apopore.
As it is shown in figure 5, limit Fluid Dynamics device 404 is arranged on the internal face of experimental model 500, limit Fluid Dynamics device 404 For the bored tube of annular, wherein aperture is uniformly distributed, and tubule surface parcel gauze, the diameter of ring pipe can be 4mm, goes out The diameter in water hole can be 0.5mm.In experimentation, can be with opposite side Fluid Dynamics device 404 water filling, it is ensured that each aperture uniformly goes out Water, thus realize simulating limit water.
The multilateral well experimental model limit Fluid Dynamics device that the embodiment of the present invention provides, simulates oil reservoir, limit, the end effectively Water, on multilateral well production capacity and the impact of nearly well pressure field distribution, makes simulation closer to the bottom water in true reservoir media, limit The multiple different boundary such as water, closing, thus obtain the impact on oil well productivity of the different boundary conditions.
Embodiment four
Figure 10 is the back-up sand method flow diagram of a kind of multilateral well experimental model that the embodiment of the present invention provides, such as Figure 10 institute Showing, described back-up sand method comprises the following steps:
S601, mixs homogeneously fine sand according to the ratio of 4:1 with clay;
S602, uses the dry method filled out insert in experimental model by mixed fine sand and clay mixture and be compacted;
S603, is filled to water saturation to described experimental model;
S604, uses white oil saturated to oil to described experimental model expelling water.
In embodiments of the present invention, experiment sand is made into simulated formation, different proportion by fine sand (200 mesh) and clay mixing Fine sand can get different permeabilities from the mixture of clay.In this technique, through lot of experiment validation fine sand and clay Optimum mixture ratio example is 4:1, and the permeability of experiment sand is 33 × 10-3μm2
In experimentation, first have to a fine sand and mix homogeneously according to optimal proportion with clay, then use the dry method filled out Carry out back-up sand, will test in sand charging apparatus, and be compacted.In order to make its compaction preferable, obtain relatively low permeability, this The method use successively back-up sand in technology, being successively compacted carries out filling.Carry out the work of saturation water after back-up sand, use the most again White oil (when 25 DEG C, white oil viscosity the is 115mPa s) driven water-replacing of particular viscosity is saturated to oil.It is swollen that the method utilizes clay to meet water Swollen performance can obtain the sandpack column of relatively low-permeability, and saturated oils method can form irreducible water, more approximation truly Oil reservoir.
In embodiments of the present invention, experimental model internal face is coated with an anti-water breakthrough coating, and anti-water breakthrough coating is by low molecule Polyamide and epoxy resin mix, and described low molecule pa resin and the ratio of epoxy resin are 3:5, waterproof The surface altering coating can cover one layer of fine sand.
The back-up sand method of the multilateral well experimental model that the present invention provides, it is possible to use the performance of clay water-swellable obtains The sandpack column that permeability is relatively low, and when the ratio of fine sand Yu clay is 4:1, the permeability of described laboratory is minimum.Utilize White oil carries out expelling water to the most saturated to experimental model, can form irreducible water, be closer to true oil reservoir in experimental model.Cause This, the present invention uses back-up sand that specific proportions mixes and generates the sandpack column that permeability that oil saturation process obtains is relatively low, makes Obtaining experimental model and more approach oil reservoir truth, the success for experiment is laid a good foundation.
Embodiment five
As it is shown in fig. 7, anti-water breakthrough coating is covered on the internal face of multilateral well experimental model, anti-water breakthrough coating is by low point Sub-polyamide and epoxy resin mix, and described low molecule pa resin and the ratio of epoxy resin are 3:5.
In embodiments of the present invention, due to the smooth meeting of model wall cause water in displacement process prolong hydraulically smooth surface alter into, make Multilateral well shifts to an earlier date water breakthrough, and moisture content steeply rises, and have impact on experimental result.Therefore in view of the impact of " water breakthrough ", ring is used Hydraulically smooth surface is processed by epoxy resins, increases the roughness of wall.First epoxy resin is allocated, by low molecule pa resin Mix with epoxy resin 3:5 in proportion.Then hydraulically smooth surface is carried out uniform application, then covers fine sand on its surface, After carry out drying and processing, to increase the roughness of wall.(noting: the allotment of epoxy resin, the process of smearing need band canister respirator).
The anti-water breakthrough coating that the embodiment of the present invention provides effectively prevent " water breakthrough ", makes simulation more approach oil reservoir true Situation, the success for experiment is laid a good foundation.
Embodiment six
Figure 11 is a kind of multilateral well experimental model anti-water breakthrough method flow diagram that the embodiment of the present invention provides, such as Figure 11 institute Showing, described method comprises the following steps:
S701, by low molecule pa resin and epoxy resin according to the ratio mix homogeneously of 3:5;
S702, is applied in the internal face of experimental model by mixed low molecule pa resin and epoxy resin composition On, form anti-water breakthrough coating;
S703, at one layer of fine sand of surface uniform fold of described anti-water breakthrough coating;
S704, dries the anti-water breakthrough coating covering fine sand.
In embodiments of the present invention, due to the smooth meeting of model wall cause water in displacement process prolong hydraulically smooth surface alter into, make Multilateral well shifts to an earlier date water breakthrough, and moisture content steeply rises, and have impact on experimental result.Therefore in view of the impact of " water breakthrough ", ring is used Hydraulically smooth surface is processed by epoxy resins, increases the roughness of wall.First epoxy resin is allocated, by low molecule pa resin Mix with epoxy resin 3:5 in proportion.Then hydraulically smooth surface is carried out uniform application, then covers fine sand on its surface, After carry out drying and processing, to increase the roughness of wall.(noting: the allotment of epoxy resin, the process of smearing need band canister respirator).
The multilateral well experimental model anti-water breakthrough method that the embodiment of the present invention provides effectively prevent " water breakthrough ", makes simulation More approaching oil reservoir truth, the success for experiment is laid a good foundation.
A kind of multilateral well experimental model, system and the back-up sand method that the embodiment of the present invention provides, has the advantage that
Effectively simulate oil reservoir, use pressure capsule system to be successfully realized the reality of multilateral well nearly well pressure field distribution Time measure, the pressure distribution recorded is more accurate.For studying the pressure field distribution around multilateral well, thus explore bottom water cone carry Put and delay the approaches and methods of bottom water coning, and provide foundation for science exploitation multilateral well bottom water reservoir.
Effectively simulate limit, bottom water to multilateral well production capacity and the impact of nearly well pressure field distribution, make simulation closer to The multiple different boundary such as bottom water in true reservoir media, Bian Shui, closing, thus obtain different boundary conditions and oil well is produced The impact of energy.
Effectively simulate multiple-limb, many well type multiple-limb well capacity and enter well pressure field distribution, being appreciated that many points The impact on multilateral well exploitation different boundary oil reservoir of the geometrical factor of Zhi Jing, provides theory for multilateral well well type optimization and depends on According to.
Data processing equipment is used to dock with pressure sensor device, can be with timely monitor model inside measuring point pressure;Display Nearly well pressure field pattern, and real-time snap shot;Gather the data Auto-Memory obtained.Stimulated the menstrual flow the nearly well pressure to multilateral well The process of force data obtains its nearly well pressure scattergram, and then obtains oil-water two-phase flow rule and rule of waterflooding.It is greatly improved Conventional efficient, for later larger logistics organizations, the simulation of more complicated reservoir condition is had laid a good foundation.
Effectively prevent " water breakthrough ", and use special back-up sand and saturation process to make the back-up sand mould of relatively low-permeability Type, makes simulation more approach oil reservoir truth, and the success for experiment is laid a good foundation.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect further Describe in detail, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should comprise Within protection scope of the present invention.

Claims (4)

1. the back-up sand method of a multilateral well experimental model, it is characterised in that described back-up sand method comprises the following steps:
Fine sand is mixed according to the ratio uniform of 4:1 with clay;
The dry method filled out is used to insert in experimental model by mixed fine sand and clay mixture and be compacted;
Described experimental model is filled to water saturation;
Use white oil saturated to oil to described experimental model expelling water.
The back-up sand method of multilateral well experimental model the most according to claim 1, it is characterised in that described white oil is at 25 DEG C Time viscosity be 115mPa s.
The back-up sand method of multilateral well experimental model the most according to claim 1, it is characterised in that described fine sand is 200 Mesh fine sand.
The back-up sand method of multilateral well experimental model the most according to claim 1, it is characterised in that described employing is dry fills out Mixed fine sand and clay mixture are inserted in experimental model and are compacted include by method:
By mixed fine sand and clay mixture according to successively back-up sand, the mode that is successively compacted is dry is filled in experimental model.
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