CN112302592B - Simulation experiment equipment for water displacement of sand body of point dam of meandering river - Google Patents
Simulation experiment equipment for water displacement of sand body of point dam of meandering river Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing 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
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- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/02—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of industrial processes; of machinery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
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Abstract
The application discloses meandering stream point dam sand body displacement of water by flooding simulation experiment equipment belongs to oil development technical field. The apparatus comprises: the two opposite sides of the model sealing box are respectively provided with a liquid injection pipe and a liquid outlet pipe; a sand body model and an annular closed pipe are arranged in the model sealing box, the annular closed pipe is positioned between the first side plate and the sand body model, a preset gap is reserved between the annular closed pipe and the side wall of the model sealing box, which is provided with the liquid injection pipe, and the surface of the annular closed pipe is provided with a plurality of water permeable holes facing the side wall provided with the liquid outlet pipe; one end of the liquid injection pipe is connected with the injection pump, and the other end of the liquid injection pipe penetrates through the side wall of the model sealing box and is communicated with the annular closed pipe. The invention can overcome the technical problem of poor water injection effect of the sand body model in the water displacement experiment of the point dam of the meandering river, and has stable effect and convenient control.
Description
Technical Field
The application relates to the technical field of oil development, in particular to a simulation experiment device for sand body water flooding of a point dam of a meandering river.
Background
With the continuous improvement of the development degree of the oil field, part of the oil field in China enters the later stage of high water content development, in the oil layer of the period, the water flooded area is large, the oil reservoir area is dispersed, and the oil reservoir presents a local enrichment state. The point dam of the meandering stream is an important oil and gas storage area, and the underground oil-water distribution condition of the point dam of the meandering stream accords with the characteristics of an oil field in the later stage of high-water-content development.
In order to understand the meandering stream point dam and to facilitate the exploitation of oil and gas in the meandering stream point dam, a sand body model of the oil and gas can be designed at present, and the meandering stream point dam can be researched in a laboratory based on the sand body model. During the experiment, the change condition of oil gas stored in the rock sand layer is simulated in a water flooding mode. When the sand body model is realized, water is continuously injected from one side of the sand body model, flows in the sand body model and drives oil gas in the sand body model to change.
A key problem of the experiment is how to inject water into the sand body model, so that the oil gas in the sand body model can be pushed by the surface, and the higher effect of water flooding can be simulated. Therefore, how to inject water into the sand body model is a problem which needs to be solved urgently in the current experiment.
Disclosure of Invention
The application provides a meandering stream point dam sand body displacement of reservoir oil by water simulation experiment equipment, and in its displacement of reservoir oil experiment that can overcome meandering stream point dam, the not good technical problem of sand body model water injection effect, the effect is stable, and control is convenient. The technical scheme is as follows:
the invention provides a simulation experiment device for sand body flooding of a point dam of a meandering river, which comprises: model seal box, sand body model, injection pump, notes liquid pipe, annular closed tube, drain pipe, wherein:
a liquid injection pipe is arranged on a first side plate of the model sealing box, a liquid outlet pipe is arranged on a second side plate of the model sealing box, and the first side plate and the second side plate are arranged oppositely; a sand body model and an annular closed pipe are arranged in the model seal box, the annular closed pipe is positioned between the first side plate and the sand body model, a preset gap is reserved between the annular closed pipe and the first side plate, and a plurality of water permeable holes facing the second side plate are formed in the surface of the annular closed pipe;
one end of the liquid injection pipe is connected with the injection pump, and the other end of the liquid injection pipe penetrates through the first side plate to be communicated with the annular closed pipe.
The beneficial effects of the invention are:
(1) According to the technical scheme, the injection pump transmits water flow to the annular closed pipe through the liquid injection pipe, and as the water permeable holes are formed in the surface of the annular closed pipe, the water flow is injected into the sand body model through the water permeable holes in a surface forming mode and pushes the oil surface in the sand body model to the second side plate of the model seal box, so that the effect of water displacement is realized, the structure is simple, and the operation is convenient;
(2) According to the technical scheme, all the water permeable holes can be controlled by controlling one liquid injection pipe, so that the water injection integrity of the equipment is good, the control efficiency is high, and the cost is saved;
(3) According to the technical scheme, the annular closed pipe prevents water flow from directly impacting a sand body model, the pressure is relatively small, and the water-driven oil effect is facilitated;
(4) This technical scheme is when rivers move to the second curb plate of model seal box, and rivers still can move gradually to the model seal box bottom and permeate the sand body model in, enlarged the range of reaching of rivers in the sand body model like this for rivers can form the effect that a face pushed in the model seal box, make the sand body model receive the water injection wave more evenly and reach, have simulated the displacement process of oil reservoir more rationally.
On the basis of the technical scheme, the invention can be improved as follows.
The annular closed pipe is characterized by further comprising a shunt pipe, wherein the shunt pipe is positioned on the inner side of the annular closed pipe, the shunt pipe is provided with at least two connecting ends, and the two connecting ends are respectively communicated with any two points on the annular closed pipe.
The injection pump transmits water flow to the flow dividing pipe through the liquid injection pipe, and then the water flow is divided by the flow dividing pipe and enters the annular closed pipe, so that the time for the water flow to reach each part in the annular closed pipe is more uniform, and the water injection effect is more stable; meanwhile, the shunt pipe can also play a certain supporting role, so that the annular closed pipe works reliably.
And the liquid inlet end of the middle container is connected with the injection pump, and the liquid outlet end of the middle container is connected with the liquid injection pipe.
The beneficial effect of adopting above-mentioned further scheme is that middle container can be used for the splendid attire to have the simulation oil of dyeing function, and this simulation oil can play the coloring effect with water is poured into the sand body model together to the convenient surplus oil state in observing the water drive oil process.
Further, the sand body model comprises a first part, a second part and a third part which are sequentially overlapped from top to bottom, wherein the first part is filled with yellow clay; the third part is filled with quartz sand; the second part comprises a first layer of sand body, a second layer of sand body and a third layer of sand body which are sequentially overlapped from top to bottom, the permeability of the first layer of sand body is 900-1000mD, the permeability of the second layer of sand body is 600-1000mD, the permeability of the third layer of sand body is 800-1200mD, the included angle between the first layer of sand body and the bottom plate of the model sealing box is 10-20 degrees, the included angle between the second layer of sand body and the bottom plate of the model sealing box is 20-30 degrees, and the included angle between the third layer of sand body and the bottom plate of the model sealing box is 10-20 degrees.
The sand body model has the advantages that the heterogeneity of the meandering stream point dam is represented mainly through the lateral integrated sandstone materials with different permeability and slope angle setting, and the simulation effect of the positive rhythm physical model of the meandering stream point dam sand body is optimized by taking the argillaceous substance as the lateral accumulated mud for covering.
Further, the thickness ratio of the first sand layer to the second sand layer to the third sand layer is 6-8.
The beneficial effect of adopting above-mentioned further scheme is through the injecing to each layer sand body thickness, helps increasing simulation effect to save material cost.
Further, still include volume counter and weight meter, drain pipe one end pass the second curb plate of model seal box and with the inner space intercommunication of model seal box, its other end and volume counter intercommunication, the lower part of volume counter is installed and is used for the weight counter of record weight.
The beneficial effect of adopting above-mentioned further scheme is that can in time show the underground crude oil of displacing through volume counter and weight counter, is favorable to the adjustment of water injection process and the final displacement effect of analysis.
Further, the device also comprises a pressure detection piece;
annotate and all be provided with the inspection hole that link up the inside and outside wall on liquid pipe and the drain pipe, pressure measurement passes through the inspection hole is installed on annotating liquid pipe and drain pipe, and the sense terminal of pressure measurement is located the inner wall of annotating liquid pipe and the inner wall of drain pipe.
It is understood that the pressure detecting member refers to a tool for measuring the pressure of gas or liquid by a pressure sensitive element and displaying the size of the pressure, and may adopt commercially available pressure detecting tools, such as a pressure gauge, a pressure measuring instrument, a pressure sensor, and the like.
The beneficial effect who adopts above-mentioned further scheme is that can monitor sand body model's pressure variation through pressure measurement spare, and the reinforcing is to the control of simulation process.
The device further comprises a support, a resistivity tester and an electrode probe matrix, wherein the model sealing box is arranged on the support; the electrode probe matrix comprises a first electrode matrix positioned in a first part of the sand body model, a second electrode matrix positioned in a first sand body layer of the sand body model, a third electrode matrix positioned in the first sand body layer of the sand body model and lower than the second electrode matrix in height, a fourth electrode matrix positioned in a second sand body layer of the sand body model, a fifth electrode matrix positioned in a third sand body layer of the sand body model and a sixth electrode matrix positioned in a third part of the sand body model, wherein each electrode probe group comprises a plurality of electrode probe groups, each electrode probe group comprises at least three electrode probes which are distributed in a trapezoidal shape, one end of each electrode probe is inserted into the sand body model from the bottom of the model seal box, and the other end of each electrode probe is connected with one end of the resistivity tester.
The beneficial effect of adopting above-mentioned further scheme is that through the electrode probe matrix that sets up in each layer of sand body model and be a plurality of electrode probes of trapezoidal arrangement, help measuring range's comprehensive cover to make measuring effect more accurate, reliable.
Further, the length of the electrode probe of the second electrode matrix exceeding the bottom surface of the first sand layer is L1, the length of the electrode probe of the third electrode matrix exceeding the bottom surface of the first sand layer is L2, the thickness of the first sand layer is L3, and L1, L2 and L3 satisfy the following relation: 5-6:2-3:7-8.
The beneficial effect of adopting the further scheme is that the structure characteristics of the meandering stream point dam are that the middle and lower layer water logging degree is higher, the oil accumulation degree is lower, the upper layer water logging degree is lower, and the oil accumulation degree is higher, so that the relative heights of the electrode probes for arranging the electrode probe matrix and controlling the second electrode matrix and the third electrode matrix in the first layer sand body are increased, the oil deposit can be detected more fully, the detection efficiency is improved, and the analysis error of a computer is reduced.
Further, the first electrode matrix, the second electrode matrix, the third electrode matrix, the fourth electrode matrix, the fifth electrode matrix and the sixth electrode matrix are all arranged in an m × n array, wherein m and n are natural numbers larger than 1.
And the computer is respectively and electrically connected with the injection pump, the weight meter and the resistivity tester.
The method has the advantages that the computer constructs the point-dam conceptual model in the commercial software and carries out numerical reservoir simulation production calculation aiming at different mechanism models, so that the residual oil distribution of each model is obtained, and three-dimensional simulation is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic connection diagram of a simulation experiment apparatus provided in an embodiment of the present application;
FIG. 2 is a structural diagram of a liquid injection pipe, a shunt pipe and an annular closed pipe provided by the embodiment of the application;
FIG. 3 is a schematic structural diagram of a sand body model and an electrode probe matrix provided by an embodiment of the application;
FIG. 4 is a schematic structural diagram of an electrode probe set provided by an embodiment of the present application;
FIG. 5 is a schematic structural diagram of an electrode probe matrix provided in an embodiment of the present application;
FIG. 6 shows resistance test results at various test points under different injected PV of forward water flooding of the simulation experiment apparatus provided in the embodiment of the present application;
fig. 7 is a calculation result of oil saturation at each measurement point at different stages of forward water flooding of the simulation experiment equipment provided in the embodiment of the present application.
2. A model seal box, 4, a computer, 6, a stent, 10, an injection pump, 12, an injection pipe, 14, a shunt pipe, 16, a ring-shaped closed pipe, 18, a water permeable hole, 20, an intermediate container, 21, a sand model, 22, a first part, 24, a second part, 26, a third part, 28, a first sand layer, 30, a second sand layer, 32, a third sand layer, 34, a drain pipe, 36, a volume meter, 38, a weight meter, 46, a resistivity tester, 48, an electrode probe matrix, 50, a first electrode matrix, 52, a second electrode matrix, 54, a third electrode matrix, 56, a fourth electrode matrix, 58, a fifth electrode matrix, 60, a sixth electrode matrix, 62, an electrode probe group, 64, an electrode probe, 64-1, an electrode probe a,64-2, an electrode probe b,64-3, an electrode probe c,88, a pressure detector.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
In the present embodiment, the term "meandering stream point dam" means that the lateral accumulation on the inner side of the river channel is accumulated, and finally, a convex beach above the river bed is formed. The meandering stream point dam generally consists of side laminated layers, which are usually formed by stacking layers of thick mud or sand, and side laminated bodies, which are located between the mud and sand layers or sand and sand layers in the side laminated layers, forming a transition zone. The side lamination is characterized in that the mud layer and/or the sand layer are/is internally distributed with oil and water, the water is distributed more in the bottom area of the side lamination, and the oil is more and more scattered and distributed in the sand body in the middle or upper part of the side lamination.
Therefore, in order to make observation of the meandering stream point dam sand body water flooding simulation more intuitive and make simulation accuracy higher, the following implementation mode is provided.
In a first mode
In this mode, a meandering stream point dam sand body flooding simulation experiment device is provided, as shown in fig. 1 to 3, which includes: model seal box 2, sand body model 21, injection pump 10, notes liquid pipe 12, annular closed tube 16, drain pipe 34, wherein: a liquid injection pipe is arranged on a first side plate of the model sealing box 2, a liquid outlet pipe 34 is arranged on a second side plate of the model sealing box 2, and the first side plate and the second side plate are arranged oppositely; a sand body model 21 and an annular closed pipe 16 are arranged in the model sealing box 2, the annular closed pipe 16 is positioned between the first side plate and the sand body model 21, a preset gap is reserved between the annular closed pipe 16 and the first side plate, and a plurality of water permeable holes 18 facing the second side plate are formed in the surface of the annular closed pipe 16; as shown in FIG. 1, the injection tube 12 is connected to the injection pump 10 at one end and communicates with the annular closure tube 16 through the first side plate at the other end.
The method can overcome the technical problem that the change rule of the displacement of water in the sand body of the point dam of the meandering river cannot be really simulated at present, and is stable in effect and convenient to control.
In this way, the injection pump 10 of the technical scheme transmits water flow to the annular closed pipe 16 through the injection pipe 12, and because the surface of the annular closed pipe 16 is provided with the water permeable holes 18, the water flow is injected into the sand body model 21 through the water permeable holes 18, and the oil in the sand body model 21 is pushed to the second side plate of the model seal box 2, so that the effect of water drive is realized, the structure is simple, and the operation is convenient; secondly, the technical scheme can realize the control of all the water permeable holes 18 by controlling one liquid injection pipe 12, so that the water injection integrity of the equipment is good, the control efficiency is high, and the cost is saved; secondly, in the technical scheme, the annular closed pipe 16 prevents water flow from directly impacting the sand body model 21, the pressure is relatively small, and the water-driven oil effect is facilitated; finally, this technical scheme is when water moves to the second curb plate of model seal box 2, and rivers still can move gradually to the bottom of model seal box 2 and infiltrate in sand body model 21, has enlarged the swept range of rivers in sand body model 21 like this for rivers can form the effect that a face pushed in model seal box 2, makes sand body model 21 receive the water injection swept more evenly, has simulated the displacement process of oil reservoir more rationally.
It is understood that in the present embodiment, a control valve is connected between the liquid injection pipe 12 and the injection pump 10, and the control valve is used for controlling the water flow speed and the water flow size through the liquid injection pipe 12, and a one-way valve can be specifically adopted.
In order to improve the water injection stability of the annular closed pipe 16, the annular closed pipe further comprises a shunt pipe 14, the shunt pipe 14 is located on the inner side of the annular closed pipe 16, the shunt pipe 14 is provided with at least two connecting ends, and the two connecting ends are respectively communicated with any two points on the annular closed pipe 16.
It can be understood that the shapes of the shunt tubes 14 in this embodiment are various, and they are mainly changed according to the number of the connecting ends, for example, when the number of the connecting ends is 2, the shunt tubes 14 are linear; when the number of the connecting ends is 3, the shunt tubes 14 can be Y-shaped or V-shaped; when the number of the connecting ends is 4, the shunt tubes 14 can also be in a cross shape; the shunt tube 14 is made of a hard material, such as plastic, metal or alloy material, stainless steel, etc.; in addition, the outer shape of the annular closed tube 16 is also various, and it may be polygonal, circular, elliptical; the annular closure tube 16 is made of a hard material, such as plastic, metal or alloy material, stainless steel, etc.; in order to improve the surface wave and efficiency, the annular closed pipe 16 can also be provided with branch pipes, for example, when the shunt pipes 14 are in a linear type, the branch pipes which are parallel to the shunt pipes 14 and are provided with the water permeable holes 18 are arranged on the inner side of the annular closed pipe 16, the number of the branch pipes is multiple, and the branch pipes are also in a linear type, so that the number of pipelines on the inner side of the annular closed pipe 16 is increased, and the water flow coverage of the annular closed pipe 16 is also increased. In the mode, the shunt tubes 14 are linear, and the number of the connecting ends is 2; the annular closure tube 16 is rectangular in shape.
In order to effectively observe the change process of reservoir displacement, the injection unit further comprises an intermediate container 20, wherein the intermediate container 20 is positioned between the injection pump 10 and the injection pipe 12, the liquid inlet end of the intermediate container 20 is connected with the injection pump 10, and the liquid outlet end of the intermediate container is connected with the injection pipe 12. The intermediate container 20 can be used for containing simulation oil with a dyeing function, and the simulation oil and water are injected into the sand body model 21 together to achieve a coloring effect, so that the state of residual oil in the water flooding process can be observed conveniently. In this mode, the simulated oil was No. 15 white oil, to which was added No. 3 oil-soluble Sudan red dye at a concentration of 1 g/L. Distilled water was used as the injection water during the experiment.
In order to obtain a more accurate simulation effect, a proper sand body model 21 is also needed for the experiment, as shown in fig. 3, the sand body model 21 includes a first part 22, a second part 24 and a third part 26 which are sequentially stacked from top to bottom, and the first part 22 is filled with yellow clay; the third part 26 is filled with quartz sand; the second part 24 comprises a first layer of sand 28, a second layer of sand 30 and a third layer of sand 32 which are sequentially overlapped from top to bottom, the permeability of the first layer of sand 28 is 900-1000mD, the permeability of the second layer of sand 30 is 600-1000mD, the permeability of the third layer of sand 32 is 800-1200mD, the included angle between the first layer of sand 28 and the bottom plate of the model seal box 2 is 10-20 degrees, the included angle between the second layer of sand 30 and the bottom plate of the model seal box 2 is 20-30 degrees, and the included angle between the third layer of sand 32 and the bottom plate of the model seal box 2 is 10-20 degrees.
In order to increase the simulation effect and save the material cost, the thickness ratio of the first sand layer 28, the second sand layer 30 and the third sand layer 32 is 6-8.
As described above for the sand body model 21, the specifications of the sand body model 21 are various, and we can give an optional model specification below, and the total size of the sand body model 21 is: the length is 800mm, the height is 400mm, and the width is 200mm; the third portion 24 of the sand body pattern 21, which had a thickness of 80mm, was filled with 1500mD quartz sand as bottom holdup deposit; the first part 22 of the sand body model 21, having a thickness of 120mm, is filled with yellow clay; the second part 24 of the sand body model 21 comprises a first sand body layer 28, a second sand body layer 30 and a third sand body layer 32 which are sequentially stacked from top to bottom, the permeability of the first sand body layer 28 is 1000mD, the permeability of the second sand body layer 30 is 800mD, the permeability of the third sand body layer 32 is 1000mD, the included angle between the first sand body layer 28 and the bottom plate of the model sealing box is 20 degrees, the included angle between the second sand body layer 30 and the bottom plate of the model sealing box is 30 degrees, the included angle between the third sand body layer 32 and the bottom plate of the model sealing box is 10 degrees, the thickness of the second part 24 is 200mm, and the thicknesses of the first sand body layer 28, the second sand body layer 30 and the third sand body layer 32 are 70mm, 60mm and 70mm respectively. The first layer of sand 28, the second layer of sand 30 and the third layer of sand 32 are all quartz sand.
It should be noted that the sand body model 21 is packaged, pressure tested, and vacuumized in the model sealing box 2. The invention provides a preferable model sealing box 2 which comprises a rectangular box body with a hollow structure, a first cover body and a second cover body, wherein the first cover body and the second cover body are fixedly connected with two ends of the box body through bolts respectively. The packaging process comprises the steps of firstly installing a visual material plate between a rectangular box body and a first cover body through bolts, filling gaps with visual elastic sealing colloid, forming a side wall capable of supporting a sand body model 21, filling the material into the sand body model 21, performing slope adjustment on a first layer of sand body 28, a second layer of sand body 30 and a third layer of sand body 32 through an angle manufacturing mold, taking out the angle manufacturing mold after adjustment, then installing another visual material plate between the rectangular box body and a second cover body through bolts, filling the gaps with the visual elastic sealing colloid, and completing packaging. Then, filling nitrogen into the model at 0.8MPa for pressure testing for 24h, wherein no pressure change is qualified; and finally, carrying out vacuum-pumping treatment on the model, connecting the model with a vacuum system, closing valves at two ends, and vacuumizing for more than 8 h. Wherein, the requirement of the visual material plate is that the pressure resistance is 2MPa.
In order to simulate the displacement process more truly, a plurality of injection wells are designed on the top of the sand body model 21, each point dam sand body layer is covered, and the injection wells are used as a production well pattern of the model and can be opened or closed according to requirements in an experiment.
In order to know the condition of the underground crude oil displaced in time, the device further comprises a volume meter 36 and a weight meter 38, one end of the liquid outlet pipe 34 passes through the second side plate of the model sealing box 2 and is communicated with the inner space of the model sealing box 2, the other end of the liquid outlet pipe is communicated with the volume meter 36, and the weight meter 38 for recording weight is arranged at the lower part of the volume meter 36, so that the adjustment of the water injection process and the analysis of the final displacement effect are facilitated.
It will be appreciated that the volume meter 36 described above refers to a measuring instrument for recording and displaying the volume of liquid, such as a graduated cylinder; the weight scale 38 refers to a measuring instrument, such as a balance, for recording and displaying the weight of the liquid. The specifications of the measuring devices are various, an optional measuring device specification is given below, the volume meter 36 adopts a glass graduated cylinder, the produced quantity of the device is large, and a 5L measuring cylinder and a balance with a measuring range of 12Kg are selected; the measuring cylinder is custom-made and calibrated for standard glass measuring instrument factories. The weight measuring device 38 is an electronic balance which is a constant flat JA12K-1: weighing Range (g): 12000; readability (g): 0.1; repeatability (g is less than or equal to): plus or minus 0.1; linear (≦ g): plus or minus 0.2; scale size (mm): 275X 327; the external dimension is as follows: 325 × 370 × 125 (mm).
In order to monitor the pressure change of the sand body model 21 and enhance the control of the simulation process, the simulation experiment equipment further comprises a pressure detection piece 88; annotate and all be provided with the inspection hole that link up the interior outer wall on liquid pipe 12 and the drain pipe 34, pressure measurement spare 88 passes through the inspection hole is installed on annotating liquid pipe 12 and drain pipe 34, and the sense terminal of pressure measurement spare 88 is located the inner wall of annotating liquid pipe 12 and the inner wall of drain pipe 34. In this embodiment, the pressure detecting member 88 is mainly composed of a pressure sensor having a measuring range of 6MPa, a precision of + -0.1% F.S, a digital display secondary meter, etc., the pressure value is directly displayed by the secondary meter and can communicate with the computer 4 through an RS232 interface, and the pressure sensor secondary meter is an NHR-5100 series digital display meter.
In order to more accurately know reservoir changes in the simulated displacement process, the sand body model 21 needs to be provided with electrodes, as shown in fig. 5, the simulated experiment equipment further comprises a support 6, a resistivity tester 46 and an electrode probe matrix 48, and the model sealing box 2 is installed on the support 6; the electrode probe matrix 48 comprises a first electrode matrix 50 located in the first part 22 of the sand body model 21, a second electrode matrix 52 located in the first sand body 28 of the sand body model 21, a third electrode matrix 54 located in the first sand body 28 of the sand body model 21 and lower than the second electrode matrix 52 in height, a fourth electrode matrix 55 located in the second sand body 30 of the sand body model 21, a fifth electrode matrix 58 located in the third sand body 32 of the sand body model 21 and a sixth electrode matrix 60 located in the third part 24 of the sand body model 21, wherein each of the electrode probe groups 62 comprises a plurality of electrode probe groups 62, each electrode probe group 62 comprises at least three electrode probes 64 arranged in a trapezoid shape, one end of each electrode probe 64 is inserted into the sand body model 21 from the bottom of the model sealing box 2, and the other end of each electrode probe is electrically connected with one end of the resistivity tester 46. Through the electrode probe 64 matrix 48 that sets up in the each layer of sand body model 21 and be a plurality of electrode probe 64 of trapezoidal arranging, help the comprehensive of measuring range to cover to make measuring effect more accurate, reliable.
As shown in FIG. 3, the three electrode probes 64 are respectively an electrode probe a 64-1, an electrode probe b 64-2 and an electrode probe c 64-3, and are arranged in a regular trapezoid.
Preferably, the length of the electrode probe 64 of the second electrode matrix 52 exceeding the bottom surface of the first sand layer 28 is L1, the length of the electrode probe 64 of the third electrode matrix 54 exceeding the bottom surface of the first sand layer 28 is L2, the thickness of the first sand layer 28 is L3, and L1, L2, and L3 satisfy the relationship: 5-6:2-3:7-8.
The arrangement of the electrode probe 64 matrix 48 is various, and the arrangement is mainly based on the size of the model, and the present embodiment provides a specific arrangement, as shown in fig. 4, the first electrode matrix 50, the second electrode matrix 52, the third electrode matrix 54, the fourth electrode matrix 55, the fifth electrode matrix 58 and the sixth electrode matrix 60 are all arranged in an m × n array, where m and n are natural numbers greater than 1.
As described in the above description of the electrode probe matrix 48, the structure of the electrode probe matrix 48 is various, and we can give an alternative structure, the length of the second electrode matrix 52 is 55mm, the height of the fifth electrode matrix 58 is 125mm, the length of the fourth electrode matrix 55 is 195mm, the length of the third electrode matrix 54 is 230mm, the length of the sixth electrode matrix 60 is 265mm, the length of the first electrode matrix 50 is 300mm, and the first electrode matrix 50, the second electrode matrix 52, the third electrode matrix 54, the fourth electrode matrix 55, the fifth electrode matrix 58 and the sixth electrode matrix 60 are all arranged in 2 × 8 arrays, where 2 is the number of rows of each matrix and 8 is the number of electrode probe groups 62 in each row, so that each array has 20 groups of uniformly distributed measuring points; in addition, the distance between two adjacent rows in the matrix is 100mm, and the distance between two adjacent electrode probe groups 62 in each row is 80mm.
It should be noted that the electrode probe 64 needs to be provided with a hole through the bottom plate of the mold sealing box 2, and a sealing ring needs to be arranged inside the hole to ensure the sealing performance.
In order to realize three-dimensional simulation, the simulation experiment equipment further comprises a computer 4, and the computer 4 is respectively and electrically connected with the injection pump 10, the weight measuring instrument 38 and the resistivity tester 46. The computer 4 constructs a point-dam conceptual model in commercial software and performs numerical reservoir simulation production calculation aiming at different mechanism models, so that the residual oil distribution of each model is obtained.
In this embodiment, 17 measurement points are extracted from the electrode probe matrix 48, i.e., as shown in FIG. 5
The resistance test and the oil saturation analysis are respectively carried out, the test and analysis results are respectively shown in fig. 6 and fig. 7, and the test and analysis results show that the simulation experiment equipment can more comprehensively and effectively simulate the change of the oil reservoir displacement process. />
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a meandering stream point dam sand body water displacement of reservoir oil simulation experiment equipment which characterized in that, it includes: model seal box (2), sand body model (21), injection pump (10), annotate liquid pipe (12), annular closed tube (16), drain pipe (34), shunt tubes (14) and intermediate container (20), wherein:
the liquid injection pipe (12) is arranged on a first side plate of the model sealing box (2), the liquid outlet pipe (34) is arranged on a second side plate of the model sealing box (2), and the first side plate and the second side plate are arranged oppositely;
the sand body model (21) and the annular closed pipe (16) are arranged in the model sealing box (2), the annular closed pipe (16) is located between the first side plate and the sand body model (21), a preset gap is reserved between the annular closed pipe (16) and the first side plate, and a plurality of water permeable holes (18) facing the second side plate are formed in the surface of the annular closed pipe (16);
the shunt tube (14) is positioned at the inner side of the annular closed tube (16), the shunt tube (14) is provided with at least two connecting ends, and the two connecting ends are respectively communicated with any two points on the annular closed tube (16);
one end of the liquid injection pipe (12) is connected with the injection pump (10), and the other end of the liquid injection pipe penetrates through the first side plate to be communicated with the annular closed pipe (16);
the intermediate container (20) is positioned between the injection pump (10) and the liquid injection pipe (12), the liquid inlet end of the intermediate container is connected with the injection pump (10), and the liquid outlet end of the intermediate container is connected with the liquid injection pipe (12);
the middle container (20) is used for containing simulation oil with a dyeing function, and the simulation oil and water are injected into the sand body model (21) together.
2. The meandering stream point dam sand body flooding simulation experiment device as claimed in claim 1, wherein the sand body model (21) comprises a first part (22), a second part (24) and a third part (26) which are sequentially stacked from top to bottom;
said first portion (22) is filled with yellow clay;
the third part (26) is filled with quartz sand;
the second part (24) comprises a first sand layer (28), a second sand layer (30) and a third sand layer (32) which are sequentially overlapped from top to bottom;
the permeability of the first sand layer (28) is 900-1000mD, the permeability of the second sand layer (30) is 600-1000mD, and the permeability of the third sand layer (32) is 800-1200mD;
and the included angle between the first layer of sand body (28) and the bottom plate of the model seal box (2) is 10-20 degrees, the included angle between the second layer of sand body (30) and the bottom plate of the model seal box (2) is 20-30 degrees, and the included angle between the third layer of sand body (32) and the bottom plate of the model seal box (2) is 10-20 degrees.
3. The meandering stream point dam sand water flooding simulation experiment apparatus as claimed in claim 2, wherein the thickness ratio of the first layer of sand (28), the second layer of sand (30) and the third layer of sand (32) is 6-8.
4. The meandering stream point dam sand body flooding simulation experiment apparatus as claimed in claim 1, further comprising a volume meter (36) and a weight meter (38);
drain pipe (34) one end pass the second curb plate of model seal box (2) and with the inner space intercommunication of model seal box (2), its other end with volume counter (36) intercommunication, the lower part of volume counter (36) is installed and is used for taking notes the weight counter (38).
5. The meandering stream point dam sand body water flooding simulation experiment device as claimed in claim 4, further comprising a pressure detection member (88);
annotate liquid pipe (12) with all be provided with the inspection hole that link up interior outer wall on drain pipe (34), pressure measurement spare (88) pass through the inspection hole is installed annotate liquid pipe (12) with on drain pipe (34), the sense terminal of pressure measurement spare (88) is located annotate the inner wall of liquid pipe (12) with the inner wall of drain pipe (34).
6. The meandering stream point dam sand body water flooding simulation experiment device as claimed in claim 5, further comprising a support (6), a resistivity tester (46) and an electrode probe matrix (48);
the model sealing box (2) is arranged on the bracket (6);
the electrode probe matrix (48) comprises a first electrode matrix (50) located in a first portion (22) of the sand body model (21), a second electrode matrix (52) located in a first sand body layer (28) of the sand body model (21), a third electrode matrix (54) located in the first sand body layer (28) of the sand body model (21) and having a lower height than the second electrode matrix (52), a fourth electrode matrix (56) located in a second sand body layer (30) of the sand body model (21), a fifth electrode matrix (58) located in a third sand body layer (32) of the sand body model (21), and a sixth electrode matrix (60) located in a third portion (26) of the sand body model (21);
and the six electrode probe groups (62) comprise at least three electrode probes (64) which are arranged in a trapezoidal shape, one end of each electrode probe (64) is inserted into the sand body model (21) from the bottom of the model sealing box (2), and the other end of each electrode probe (64) is electrically connected with one end of the resistivity tester (46).
7. The meandering stream point dam sand flooding simulation experiment apparatus as claimed in claim 6, wherein the length of the electrode probe (64) of the second electrode matrix (52) exceeding the bottom surface of the first layer of sand (28) is L 1 The length of the electrode probes (64) of the third electrode matrix (54) exceeding the bottom surface of the first sand layer (28) is L 2 The thickness of the first sand layer (28) is L 3 ，L 1 、L 2 、L 3 Satisfies the relationship: 5-6:2-3:7-8.
8. The meandering stream point dam sand water flooding simulation experiment apparatus according to claim 7, wherein the first electrode matrix (50), the second electrode matrix (52), the third electrode matrix (54), the fourth electrode matrix (56), the fifth electrode matrix (58), and the sixth electrode matrix (60) are all arranged in an m × n array, where m and n are natural numbers greater than 1.
9. The meandering stream point dam sand body flooding simulation experiment apparatus according to claim 6, further comprising a computer (4), wherein the computer (4) is electrically connected with the injection pump (10), the weight measuring device (38) and the resistivity tester (46), respectively.
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