CN115749758A - Experimental device and method for monitoring oil saturation in real time in thickened oil exploitation - Google Patents
Experimental device and method for monitoring oil saturation in real time in thickened oil exploitation Download PDFInfo
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Abstract
The invention discloses an experimental device and a method for monitoring oil saturation in real time in thickened oil recovery, wherein the operation method comprises the steps of preparing a sand layer before experiment, connecting an LCR digital electric bridge instrument with a computer, arranging a resistance test lead in the experimental device, adding water, recording an initial resistance value after the sand layer is saturated with water, injecting oil into the experimental device at intervals by a displacement pump at a constant speed, recording resistance data during injection at any time, calculating the oil saturation according to the injection amount, corresponding the resistance and the saturation to obtain corresponding data of the oil saturation and the resistance, drawing a corresponding layout, arranging a well position and a lead according to design requirements, filling sand, saturating the saturated oil with water, covering and carrying out closed displacement production, recording resistance data in real time in the production process, and corresponding the resistance data and the corresponding layout to obtain the oil saturation. According to the invention, a quartz sand layer laying scheme can be independently designed according to the homogeneity characteristic of the target reservoir, so that the feasibility and diversity of the experimental scheme are greatly increased, and on the other hand, the sand filling device is used, so that the complex real reservoir rock sample is avoided, the operation of coring the stratum rock on site is avoided, and the experimental cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of petroleum development, in particular to the field of reservoir simulation development models, and particularly relates to an experimental device for monitoring oil saturation in real time in heavy oil exploitation and a using method thereof.
Background
In the process of the development of global economy, the reserves of available energy are continuously reduced, and the storage of conventional crude oil is most representative of the reserves. China is a large petroleum consumption country, so the reduction of the crude oil production quantity brings influence to the development of China to a certain extent, but the land of China is a big thing, and very rich thickened oil resources are contained in the land.
In a thick oil recovery simulation experiment, an internal model is usually filled with a mixture of oil and sand, the oil saturation degree of the model indicates the oil content of the model, and the oil saturation degree is one of important parameters of the thick oil recovery experiment, and the numerical difference of the oil saturation degree before and after the thick oil thermal recovery experiment is used for verifying the advancement and success rate of a thick oil recovery technology. The accuracy of the oil saturation data is an important evidence for evaluating the reliability of the thickened oil recovery experimental equipment. As the thick oil exploitation experimental equipment is required to have good tightness, the tightness of the device cannot be influenced by the measurement of the oil saturation, so that extremely high requirements are provided for the measurement method.
The main methods for determining the oil saturation degree include (1) coring the oil-based mud, measuring the residual water saturation of the rock core, (2) high-pressure closed coring, (3) solving the true resistivity of the stratum by using resistivity logging information, and checking a related chart to determine the oil saturation degree. The resistivity measurement method is widely applied to oil saturation monitoring in heavy oil recovery. The principle of the resistivity measuring method is that different sand layer types correspond to different resistivity values, when the components of the sand layer in the model are determined, the resistivity value is also a fixed value, after oil is saturated, the resistivity value at a certain position in the sand layer is related to the oil content at the position, the oil saturation at the fixed position corresponds to different resistivity values at different moments, the resistivity value at the position is measured, and the oil saturation can be determined by checking a related layout. The resistivity measuring method is convenient and simple, and has strong applicability and high accuracy. However, in the current resistivity measurement method, a fixed-point buried measurement point is adopted and then an electric signal line is directly pulled for detection, so that the method cannot ensure the position fixation between resistance measurement point positions and the good sealing property of a model, and the accuracy of a measurement result is greatly influenced.
A device for measuring oil saturation through resistivity (patent application number 201910175696.4) applies a three-electrode cutting sleeve resistance measuring device, the distance of the measured electrodes is constant, the stability of resistivity test data can be ensured, and the sealing performance of the device can be ensured. The defects are as follows: the test has fewer measured points, the oil saturation in the model cannot be comprehensively monitored, the clamping sleeve needs to be electrified during the test, and the device is complex to install.
A water flooding experiment device and an experiment method of a bottom water two-dimensional flat plate physical model (patent application number 201911133728.0) simulate a water flooding experiment by adopting the bottom water two-dimensional flat plate model, and analyze and describe oil-water distribution conditions in the bottom water two-dimensional flat plate physical model at a water break moment and different liquid extraction moments according to data acquisition moments corresponding to images shot by a camera. The disadvantages are that: the oil saturation is analyzed by adopting a camera shooting image analysis method, images cannot be obtained at the bottom and the inner layer of the model, and the oil saturation at different depths in the model cannot be monitored.
The invention provides an experimental device for monitoring oil saturation in real time in thickened oil recovery, wherein resistance test point positions are fixed, the insertion depth of a resistance monitoring lead can be changed, the density of distribution of test points is improved on the premise of ensuring the accuracy of resistance test data, meanwhile, the resistance monitoring lead is distributed in a model, the model has good sealing performance, the resistance of each point position can be monitored in real time under the condition of not influencing the experimental process, the whole displacement process can be visually and visually observed, and the oil saturation can be monitored in real time by comparing the resistance-oil saturation related layout with the real-time resistance data.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and title of the application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or problems occurring in the existing experimental apparatus for monitoring oil saturation in real time with respect to heavy oil recovery.
Therefore, the problem to be solved by the invention is how to provide an experimental device for monitoring oil saturation in real time in the process of thick oil production.
In order to solve the technical problems, the invention provides the following technical scheme: an experimental device for monitoring oil saturation in real time in relation to thickened oil recovery comprises an experimental device and a resistance monitoring device, wherein the experimental device consists of a thickened oil displacement two-dimensional visual physical simulation device main body and a resistance monitoring device;
the simulation experiment module main body comprises a model upper cover plate, a model main body, a model bottom plate, a compaction plate, a rectangular cavity and double-layer organic glass;
the resistance monitoring device comprises a resistance monitoring lead, an LCR digital bridge instrument, a data acquisition box and a computer control system;
the experimental device for monitoring the oil saturation in real time in thickened oil recovery is seen from the horizontal direction, the model bottom plate is wrapped by the LCR digital bridge instrument, the compaction plate, the rectangular cavity, the lead, the double-layer organic glass and the model upper cover plate, and the LCR digital bridge instrument, the compaction plate, the rectangular cavity, the lead, the double-layer organic glass and the model upper cover plate are arranged from top to bottom in the vertical direction.
As a preferred scheme of the experimental device for monitoring the oil saturation in real time in thickened oil recovery, the experimental device comprises the following components: the inner wall of the model main body made of stainless steel metal is ground into a smooth plane square frame;
the double-layer organic glass is made of a high-strength high borosilicate glass plate;
the model main body is connected with the bottom plate through a bottom plate bolt and a rubber gasket;
the model upper cover is connected with the model main body through a bolt;
a quartz sand layer is filled between the stainless steel plate and the high-strength double-layer high borosilicate glass plate;
the plane of the piston type upper cover plate is uniformly divided into 16 square grooves;
the resistance monitoring wires are uniformly distributed in the inner cavity of the model main body;
the resistance monitoring module consists of a foremost resistance monitoring lead, a gasket, a fixed bolt and an LCR digital bridge instrument;
the resistance monitoring lead penetrates through screw holes in the model bottom plate and the compaction plate and is buried in the quartz sand layer, and the resistance monitoring lead is fixed through a gasket and a bolt.
As a preferred scheme of the experimental device for monitoring the oil saturation in real time in the thickened oil recovery, the experimental device comprises the following components: the outer layer of the resistance monitoring lead is made of polytetrafluoroethylene, the metal wire is made of nichrome/nickel-silicon alloy, the outer diameter of the lead is 1mm, and the inner diameter of the lead is 0.55mm;
the resistance monitoring modules are all connected with an LCR digital electric bridge instrument, and the LCR digital electric bridge instrument is connected with a data acquisition box of a computer through a data line.
The invention is provided in view of the above and/or the problems existing in the use method of the existing experimental device for monitoring the oil saturation in real time in thickened oil production.
Therefore, the problem to be solved by the invention is how to provide a use method of an experimental device for monitoring oil saturation in real time in relation to thick oil exploitation.
As a preferred scheme of the using method of the experimental device for monitoring the oil saturation in real time in thickened oil recovery, the experimental device comprises the following steps: preparing a sand layer before an experiment, and connecting an LCR digital bridge instrument with a computer;
laying a resistance monitoring lead in the experimental device, laying a sand layer, adding water, and recording an initial resistance value after the sand layer is saturated with water;
injecting oil into the experimental device at intervals by using an ISCO plunger pump at a constant speed, and recording resistance data during injection at any time;
and calculating the oil saturation according to the injection amount, corresponding the resistance and the saturation to obtain corresponding data of the oil saturation and the resistance, and drawing a corresponding layout.
As a preferred scheme of the using method of the experimental device for monitoring the oil saturation in real time in the thickened oil recovery, the experimental device comprises the following steps: the size of a sand filling cavity of the sand layer prepared before the experiment is 500mm multiplied by 30mm, the well position arrangement scheme is that 1 injection well is distributed in the center of the model, and 1 production well is distributed in each of 4 corners.
As a preferred scheme of the using method of the experimental device for monitoring the oil saturation in real time in the thickened oil recovery, the experimental device comprises the following steps: the water adding process in the experimental device comprises the steps of wetting sand by using a small amount of water, reducing air in pores of the sand to avoid excessive gas-liquid interfacial tension and incapability of compacting during saturated oil, tamping, stacking and filling a layer by layer until the layer is approximately leveled or slightly lower than the edge of a model, flattening and compacting the surface layer of the sand by using a tool to avoid unevenness of the surface of the sand layer as much as possible, and recording the total water adding amount as L 0 mL。
As a preferred scheme of the using method of the experimental device for monitoring the oil saturation in real time in the thickened oil recovery, the experimental device comprises the following steps: the refueling process of the trunk pump for the experimental device comprises the steps of pouring oil into a sand filled model by the displacement pump at a constant speed, five times of refueling, namely C1 to C5,
when no oil is added to the sand pack model, L is added by a displacement pump 0 The 15% oil amount is recorded as step C1;
when the C1 process is finished, the oiling is suspended, and after 4 minutes, L is added by a trunk pump 0 The 20% oil amount is recorded as step C2;
when the C2 process is finished, the oiling is suspended, and after waiting for 4 minutes, the L is added by using a trunk pump 0 40% ofThe amount of oil is recorded as step C3;
when the C3 process is finished, the oiling is suspended, and after 4 minutes, the L is added by a trunk pump 0 The 20% oil amount is recorded as step C4;
when the C4 process is finished, the oiling is suspended, and after waiting for 4 minutes, the L is added by using a trunk pump 0 The 5% oil amount is recorded as step C5;
meanwhile, the total volume of poured oil needs to be measured, a small amount of oil needs to be poured for many times, the oil pouring is stopped when the sand surface is in a saturated state, namely a smooth oil layer exists, the oil cannot be excessively saturated, and the oil loss caused by extrusion of the oil when the subsequent compaction operation is carried out is avoided.
As a preferred scheme of the using method of the experimental device for monitoring the oil saturation in real time in thickened oil recovery, the experimental device comprises the following steps: before the oil saturation is calculated, namely after the experimental device is saturated with oil, gluing the periphery of the sealing ring close to one side of the sand filling by using a transparent sealant, so as to ensure the sealing property;
the experimental device has 81 hole sites, except 5 wells, the rest 76 holes are determined as point sites needing resistance rate measurement, one end of a resistance measurement lead firstly passes through a perforated bolt and then passes through an isolation gasket, then the resistance measurement lead is inserted into the corresponding hole sites of the back channel of the two-dimensional large flat plate, then the bolt is screwed and fixed, and the other half of the resistance measurement lead is connected into the LCR digital bridge instrument.
As a preferred scheme of the application method of the experimental device for monitoring the oil saturation in real time in the thickened oil recovery, the injection speed of an injection well is set to be 10mL/min, a valve at the bottom of a six-way valve connection model is opened, and a valve of a production well is opened to carry out water-flooding production;
the water displacement production is that ISCO plunger pump carries out water displacement production, uses the manometer to record production pressure difference, and four production wells use 100mL graduated flask every 10min to carry out the measurement and produce oil respectively, and the number of numbering is weighed, and a period of time of stewing, resistance value that all resistance monitoring wires were located is gathered to data and image acquisition system, and the record of taking a picture is carried out in real time to the change of model inside, records visual window production condition.
As a preferred scheme of the using method of the experimental device for monitoring the oil saturation in real time in thickened oil recovery, the experimental device comprises the following steps: and the sign of the end of the experiment is that when the moisture content of the outlet end reaches 98%, the water displacement experiment is stopped.
The invention has the beneficial effects that:
(1) The traditional measuring method that fixed-point embedded measuring points are adopted and then electric signal lines are directly pulled is abandoned, fixed resistance measuring point positions are adopted, the accuracy of resistance testing data is ensured, resistance measuring density can be arranged as required, and the measuring range is fully ensured;
(2) The quartz sand layer laying scheme can be independently designed according to the homogeneity characteristic of a target reservoir, the feasibility and the diversity of the experimental scheme are greatly increased, on the other hand, the sand filling device is used, the use of complex real reservoir rock samples is avoided, the operation of coring on-site stratum rocks is avoided, and the experimental cost is greatly reduced.
(3) The resistance monitoring device is easy to install, low in price, high in measuring speed and high in measuring precision, real-time measurement can be achieved, and the real-time oil saturation inside the model device can be obtained after relevant layout is checked.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor. Wherein:
fig. 1 is a main body front view of an experimental device for monitoring oil saturation in real time in relation to heavy oil recovery in example 1.
Fig. 2 is a top exploded view of the main body of the experimental apparatus for monitoring oil saturation in real time in relation to thick oil recovery in example 1.
Fig. 3 is a main sectional view of the experimental apparatus for monitoring oil saturation in real time in relation to thick oil recovery in example 2.
Fig. 4 is a rear view of the main body of the experimental apparatus for monitoring the oil saturation in real time in relation to the thick oil recovery in example 2.
Fig. 5 is a diagram showing a corresponding oil saturation-resistance value layout of the experimental apparatus for monitoring oil saturation in real time in relation to thick oil recovery in example 2.
Fig. 6 is a diagram of the oil saturation field at the moment of 140min of displacement of the experimental device for monitoring the oil saturation in real time in relation to thick oil recovery in example 2.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures of the present invention are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and it will be appreciated by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the present invention and that the present invention is not limited by the specific embodiments disclosed below.
Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 6, a first embodiment of the present invention provides an experimental apparatus for monitoring oil saturation in real time in relation to heavy oil production and a method of using the same, and the experimental apparatus for monitoring oil saturation in real time in relation to heavy oil production and the method of using the same includes
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1-4, the invention provides an experimental device for monitoring oil saturation in real time in heavy oil recovery, which comprises a heavy oil displacement two-dimensional visual physical simulation device main body and a resistance monitoring device. The simulation experiment module main body comprises: the device comprises a model upper cover plate 7, a model main body 8, a model bottom plate 1, a compacting plate 3, a rectangular cavity 4 and double-layer organic glass 6; the resistance monitoring device comprises; a resistance monitoring lead 5, an LCR digital bridge instrument 2, a data acquisition box and a computer control system.
The inner wall of the model main body made of stainless steel metal is ground into a smooth plane square frame; the double-layer organic glass is made of a high-strength high borosilicate glass plate; the model main body is connected with the bottom plate through a bottom plate bolt and a rubber gasket; the model upper cover is connected with the model main body through a bolt; a quartz sand layer is filled between the stainless steel plate and the high-strength double-layer high borosilicate glass plate; the plane of the piston type upper cover plate is uniformly divided into 16 square grooves; the resistance monitoring wires are uniformly distributed in the inner cavity of the model main body; the resistance monitoring module consists of a foremost resistance monitoring lead, a gasket, a fixed bolt and an LCR digital bridge instrument; the resistance monitoring lead penetrates through screw holes on the model bottom plate and the compacting plate and is buried in the quartz sand layer, and the resistance monitoring lead is fixed through a gasket and a bolt; the outer layer of the resistance monitoring lead is made of polytetrafluoroethylene, the metal wire is made of nickel-chromium alloy/nickel-silicon alloy, the outer diameter of the lead is 1mm, and the inner diameter of the lead is 0.55mm;
preparing a sand layer material before an experiment, and connecting an LCR digital bridge instrument with a computer;
laying a resistance monitoring lead in the experimental device, laying a sand layer, adding water, and recording an initial resistance value after the sand layer is saturated with water;
injecting oil into the experimental device at intervals by using an ISCO plunger pump at a constant speed, and recording resistance data during injection at any time;
and calculating the oil saturation according to the injection amount, corresponding the resistance to the saturation to obtain corresponding data of the oil saturation and the resistance, and drawing a corresponding layout.
The water adding process in the experimental device includes wetting sand with a small amount of water, reducing air in pores of the sand to avoid excessive expansion of gas-liquid interface and compaction during saturated oil, tamping, stacking and filling the sand layer by layer until the sand layer is approximately level or slightly lower than the edge of a model, leveling and compacting the surface layer of the sand by using a tool to avoid unevenness of the surface of the sand layer as much as possible, and recording total water adding quantity as L 0 mL。
The ISCO plunger pump oil injection process for the experimental device is characterized in that an injection well valve is opened, a production well valve is closed, oil is injected through an injection well at a constant speed, and resistance data and the injected oil quantity are recorded all the time.
The production method comprises the steps of performing water drive replacement production by using an ISCO plunger pump, recording production pressure difference by using a pressure gauge, performing oil production by measuring the quantity of the four production wells at an interval of 10min by using 100mL measuring cylinders, numbering and weighing, standing for a period of time, collecting the resistance values of all resistance monitoring wires by using a data and image collection system, photographing and recording the change inside a model in real time, and recording the production condition of a visible window. The sign of the end of the experiment is that when the water content at the outlet end of the production well reaches 98%, the water displacement experiment is stopped.
Example 2
Referring to fig. 5 to 6, a second embodiment of the present invention, which is different from the first embodiment, is: also included are. In the last embodiment, the experimental device for monitoring the oil saturation in real time in relation to the thick oil production and the using method comprise
With reference to fig. 1-6, the experimental protocol is as follows:
And 6, a model comprises 81 hole sites, except 5 wells, the rest 76 holes are determined as point sites needing to measure the resistance rate, one end of a resistance monitoring lead 5 firstly penetrates through a perforated bolt and then penetrates through an isolation gasket, then is inserted into the corresponding hole site of the back channel of the two-dimensional large panel, then the bolt is screwed and fixed, the other half is connected to an LCR digital electric bridge instrument 2, and the LCR digital electric bridge instrument is connected with a computer.
And 7, selecting 60-80-mesh dry quartz sand for sand filling, wetting the sand by using a small amount of water during sand filling, reducing air in sand pores to avoid the situation that the air-liquid interface is too large and cannot be compacted during saturated oil, then tamping, stacking and filling the sand layer by layer until the sand layer is approximately leveled or slightly lower than the edge of the model, and performing leveling and compacting treatment on the sand surface layer by using a tool to avoid the surface unevenness of the sand layer as much as possible.
And 8, pouring oil into the sand filled model, measuring the total volume of the poured oil, pouring a small amount of oil for many times, stopping pouring the oil when the surface of the sand is in a saturated state, namely a smooth oil layer is formed, and preventing the oil from being excessively saturated, so that the oil is prevented from being extruded to cause oil loss when the subsequent compaction operation is carried out.
And 9, after the oil is saturated, gluing the periphery of the sealing ring close to one side of the sand filling by using a transparent sealant, so as to ensure the sealing property.
And step 10, after the sand is filled, lightly putting the double-layer organic glass 6, slowly putting the upper metal frame cover plate 7 with the positioning bolt, and simultaneously screwing the bolt clockwise by the two persons, so as to ensure that the metal frame is uniformly stressed.
And 11, opening a valve of the production well, placing a measuring cylinder to record the volume of the discharged oil when the production well is pressed down, and compacting.
And step 12, setting the injection speed of the injection well to be 10mL/min, opening a valve at the bottom of the six-way valve connecting model, and opening a valve of the production well for water drive production. And (3) recording the production pressure difference by using a pressure gauge, metering and producing oil by using 100mL measuring cylinders every 10min for 4 production wells, numbering and weighing, standing for a period of time, and acquiring the resistance values of all resistance monitoring leads by using a data and image acquisition system. And shooting and recording the change inside the model in real time, and recording the production condition of the visual window. And stopping the water displacement experiment when the water content at the outlet end of the production well reaches 98%. After production, the pump is stopped and all valves are closed.
And step 13, checking the oil saturation-resistance value layout according to the recorded resistivity value to obtain the oil saturation of the measured point at each moment, and drawing a model oil saturation field diagram.
The experimental device for monitoring the oil saturation in real time in the thickened oil exploitation and the use method thereof are designed, so that the displacement development process can be clearly and intuitively simulated; the resistance monitoring device is used for conveniently monitoring the resistance data of each point position in each period, clearly reflecting the change condition of the oil saturation at the point position, and on the other hand, the device can also be used for simulating various complex stratum mining methods to conveniently simulate the real oil layer condition.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides an experimental apparatus for thick oil exploitation real-time supervision oiliness saturation which characterized in that: the experimental device consists of a thickened oil displacement two-dimensional visual physical simulation device main body and a resistance monitoring device;
the simulation experiment module main body comprises a model upper cover plate (7), a model main body (8), a model bottom plate (1), a compacting plate (3), a rectangular cavity (4) and double-layer organic glass (6);
the resistance monitoring device comprises a resistance monitoring lead (5), an LCR digital bridge instrument (2), a data acquisition box and a computer control system;
the experimental device for monitoring the oil saturation in real time in thickened oil production is seen from the horizontal direction, the model bottom plate (1) is connected with the LCR digital bridge instrument (2), the compacting plate (3), the rectangular cavity (4), the resistance monitoring wire (5), the double-layer organic glass (6), the model upper cover plate (7), the LCR digital bridge instrument (2), the compacting plate (3), the rectangular cavity (4), the resistance monitoring wire (5), the double-layer organic glass (6), the model upper cover plate (7) and is arranged from top to bottom in the vertical direction.
2. The experimental device for monitoring oil saturation in real time in relation to thick oil recovery as set forth in claim 1, wherein: the inner wall of the model main body made of stainless steel metal is ground into a smooth plane square frame;
the double-layer organic glass is made of a high-strength high borosilicate glass plate;
the model main body is connected with the bottom plate through a bottom plate bolt and a rubber gasket;
the model upper cover is connected with the model main body through a bolt;
a quartz sand layer is filled between the stainless steel plate and the high-strength double-layer high borosilicate glass plate;
the plane of the piston type upper cover plate is uniformly divided into 16 square grooves;
the resistance monitoring wires are uniformly distributed in the inner cavity of the model main body;
the resistance monitoring module consists of a foremost resistance monitoring lead, a gasket, a fixed bolt and an LCR digital bridge instrument;
the resistance monitoring lead penetrates through screw holes in the model bottom plate and the compaction plate and is buried in the quartz sand layer, and the resistance monitoring lead is fixed through a gasket and a bolt.
3. The experimental apparatus for monitoring oil saturation in real time in relation to thick oil recovery as set forth in claim 1 or 2, wherein: the outer layer of the resistance monitoring lead is made of polytetrafluoroethylene, the metal wire is made of nichrome/nickel-silicon alloy, the outer diameter of the lead is 1mm, and the inner diameter of the lead is 0.55mm;
the resistance monitoring modules are all connected with an LCR digital bridge instrument, and the LCR digital bridge instrument is connected with a data acquisition box of a computer through a data line.
4. The utility model provides a method for using about thickened oil exploitation real-time supervision oiliness saturation experimental apparatus, its characterized in that:
preparing a sand layer material before an experiment, and connecting an LCR digital bridge instrument with a computer;
laying a resistance monitoring lead in the experimental device, laying a sand layer, adding water, and recording an initial resistance value after the sand layer is saturated with water;
injecting oil into the experimental device at intervals by using an ISCO plunger pump at a constant speed, and constantly recording resistance data during injection;
and calculating the oil saturation according to the injection amount, corresponding the resistance and the saturation to obtain corresponding data of the oil saturation and the resistance, and drawing a corresponding layout.
5. The use method of the experimental device for monitoring the oil saturation in real time in relation to thickened oil recovery as set forth in claim 4, wherein: the size of a sand filling cavity of the sand layer prepared before the experiment is 500mm multiplied by 30mm, the well position arrangement scheme is that 1 injection well (11) is distributed in the center of the model, and 1 production well (10) is distributed in each of 4 corners.
6. The use method of the experimental device for monitoring the oil saturation in real time in relation to thickened oil recovery according to claim 5, characterized in that: the water adding process in the experimental device comprises the steps of wetting sand by using a small amount of water, reducing air in sand pores to avoid excessive gas-liquid interfacial tension and incapability of compacting during saturated oil, then tamping, stacking and filling the sand layer by layer until the sand layer is approximately level or slightly lower than the edge of a model, carrying out leveling and compacting treatment on a sand surface layer by using a tool to avoid unevenness of the sand surface as much as possible, and recording the total water adding amount as L 0 。
7. The use method of the experimental device for monitoring the oil saturation in real time in relation to thickened oil recovery as set forth in claim 6, wherein: the refueling process of the displacement pump for the experimental device comprises the steps of pouring oil into a sand-filled model at a constant speed by the displacement pump, five times of refueling in total, namely the steps C1 to C5,
when no oil is added to the sand pack model, L is added by a displacement pump 0 The 15% oil amount is recorded as step C1;
when the C1 process is finished, the oiling is suspended, and after 4 minutes, L is added by a trunk pump 0 The 20% oil amount is recorded as step C2;
when the C2 process is finished, the oiling is suspended, and after waiting for 4 minutes, the L is added by using a trunk pump 0 The 40% oil amount is recorded as step C3;
when the C3 process is finished, the oiling is suspended, and after 4 minutes, the L is added by a trunk pump 0 The 20% oil amount is recorded as step C4;
when the C4 process is finished, the oiling is suspended, and after waiting for 4 minutes, the L is added by using a trunk pump 0 The 5% oil amount is recorded as step C5;
meanwhile, the total volume of poured oil needs to be measured, a small amount of oil needs to be poured for many times, the oil pouring is stopped when the sand surface is in a saturated state, namely a smooth oil layer exists, the oil cannot be excessively saturated, and the oil loss caused by extrusion of the oil when the subsequent compaction operation is carried out is avoided.
8. The use method of the experimental device for monitoring the oil saturation in real time in relation to the thick oil recovery as set forth in claim 6 or 7, wherein: before the oil saturation is calculated, namely after the experimental device is saturated with oil, the periphery of the sealing ring is glued by transparent sealant along one side of the sand filling, so that the sealing property is ensured;
the experimental device has 81 hole sites, except 5 wells, the rest 76 holes are determined as the point sites needing to measure the resistance rate, one end of a resistance monitoring lead (5) firstly passes through a bolt with holes and then passes through an isolation gasket, then the resistance monitoring lead is inserted into the corresponding hole site of the back channel of the two-dimensional large flat plate, then the bolt is screwed and fixed, and the other half of the resistance monitoring lead is connected into the LCR digital bridge instrument (2).
9. The use method of the experimental device for monitoring the oil saturation in real time in relation to thickened oil recovery as set forth in claim 8, wherein: setting the injection speed of an injection well to be 10mL/min, opening a valve at the bottom of the six-way valve connecting model, and opening the valve of the injection well to perform water flooding production;
the water displacement production is that a pressure gauge is used for recording the production pressure difference, 4 production wells respectively use a 100mL measuring cylinder to perform oil production by metering every 10min, numbering and weighing are performed, standing is performed for a period of time, a data and image acquisition system is used for acquiring the resistance values of all resistance monitoring wires, the change inside the model is photographed and recorded in real time, and the production condition of a visual window is recorded.
10. Use of the experimental apparatus for real-time monitoring of oil saturation in connection with thick oil recovery according to any one of claims 7 or 9, wherein: and the sign of the end of the experiment is that when the moisture content of the outlet end reaches 98%, the water displacement experiment is stopped.
Priority Applications (1)
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