CN103247215B - Low-permeability oil deposit commingling production physical simulation system and method - Google Patents
Low-permeability oil deposit commingling production physical simulation system and method Download PDFInfo
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Abstract
The invention discloses a kind of low-permeability oil deposit commingling production physical simulation system and method, wherein, described system comprises: injection device, multiple areal model and measurement mechanism; Injection device is connected with each areal model, and each areal model is connected with measurement mechanism, and wherein, injection device, for being injected in multiple areal model by displacement fluid; Multiple areal model, is formed by the saturating sandstone flat panel enclosure of the Natural Low-permeable of different permeability, for simulating the different substratums of stratified reservoir; Wherein, arranging pressure measurement point in the front of each areal model, for measuring the pressure field of the pressure measurement point of each areal model, and arranging electrode measurement point at the back side of each areal model, for measuring flow field and the saturation field of each areal model; Measurement mechanism, for gathering the pressure field of each areal model, flow field and saturation field.
Description
Technical field
The invention relates to the experiment of petroleum industry geologic development plane simulation, a kind of particularly low-permeability oil deposit commingling production physical simulation system and method.
Background technology
At present, the experimental study for carrying out indoor physical simulation to Oil Field Development and Production mainly adopts one dimension rock core and flat plate model.For low-permeability oil deposit, one of them notable feature is exactly that nonuniformity is strong, and different parts reservoir properties differs greatly, and the control action of fluid flow is different.Due to the existence of nonuniformity, oil reservoir with multiple series of strata interlayer development degree differs greatly, serious interlayer interference, each layer waterflooding effect differ greatly.In order to study this kind of oil reservoir multilayer close note conjunction adopt time, each layer waterflooding effect difference, fluid flow characteristics and the regularity of distribution, displacements in parallel for several blocks of one dimension rock cores are tested by experimental system in parallel by prior art, obtain some useful conclusions.Due to the complicacy of percolation in low permeability oil reservoir rule, traditional one dimension little core non linear fluid flow through porous medium experimental study can not reflect fluid non linear fluid flow through porous medium rule in the two-dimensional direction completely.Prior art also makes hyposmosis flat physical model by adopting hyposmosis natural sandstone flat board to appear and carries out Seepage Experiment, obtains some useful conclusions.Due to laboratory condition restriction, there is no scholar at present and adopt flat plate model to carry out experimental study to oil reservoir with multiple series of strata interlayer development degree, interlayer interference, each layer waterflooding effect.
Summary of the invention
Technical matters solved by the invention overcomes the shortcoming of prior art, provides a kind of low-permeability oil deposit commingling production physical simulation system and method.
In the present invention, provide a kind of low-permeability oil deposit commingling production physical simulation system, comprising: injection device, multiple areal model and measurement mechanism; Described injection device is connected with areal model described in each, and areal model described in each is connected with described measurement mechanism, and wherein, described injection device, for being injected in described multiple areal model by displacement fluid; Described multiple areal model, is formed by the saturating sandstone flat panel enclosure of the Natural Low-permeable of different permeability, for simulating the different substratums of stratified reservoir; Wherein, described in each, pressure measurement point is arranged in the front of areal model, for measuring the pressure field of the pressure measurement point of areal model described in each, and electrode measurement point is arranged, for measuring flow field and the saturation field of areal model described in each in the back side of areal model described in each; Described measurement mechanism, for gathering the described pressure field of areal model described in each, flow field and saturation field.
In the present invention, additionally provide a kind of low-permeability oil deposit commingling production physical simulating method, comprising: select multiple areal model as required; Displacement fluid is injected into described multiple areal model; Gather the pressure field of the described multiple areal model of measurement, flow field and saturation field.
The present invention compares in prior art for the blank of flat plate model in research commingling production experimental technique, invent a kind of low-permeability oil deposit commingling production physical simulation system and method, automatically can record pressure field and the flow field of each layering when commingling production is tested.When simulating stratified reservoir exploitation, the pressure change on stream of every one deck can be understood respectively and flow field change understands oil reservoir development rule, evaluating the basis of existing development effectiveness and next step plan for adjustment of formulation.Existing experimental technique can not measure pressure field and flow field simultaneously at present, thus perfect not to the analysis of experimental result; Measure while present invention achieves the pressure field of stratified reservoir performance history physical simulation experiment and flow field.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the structural representation of the infiltration oil reservoir commingling production physical simulation system of the embodiment of the present invention.
Fig. 2 is the structural representation of the injection device of the embodiment of the present invention.
Fig. 3 is the structural representation of the measurement mechanism of the embodiment of the present invention.
Fig. 4 is the electrode measurement point numbering schematic diagram of the areal model of the embodiment of the present invention.
Fig. 5 is the circuit diagram of the multi-channel data acquisition device of the embodiment of the present invention.
Fig. 6 is the structural representation of the infiltration oil reservoir commingling production physical simulation system of another embodiment of the present invention.
Fig. 7 is the flow chart of steps of the infiltration oil reservoir commingling production physical simulating method of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, schematic description and description of the present invention is for explaining the present invention, but not as a limitation of the invention.
Figure 1 shows that the structural representation of the infiltration oil reservoir commingling production physical simulation system of the embodiment of the present invention.(hereinafter referred to as system) as shown in Figure 1, described system comprises: injection device, multiple areal model and measurement mechanism; Wherein,
Injection device 11, for being injected into multiple areal model 12 by displacement fluid;
Multiple areal model 12, adopts different physical dimensions and well pattern type, and the saturating sandstone flat panel enclosure of Natural Low-permeable of different permeability forms, for simulating each plane of stratified reservoir;
Wherein, pressure measurement point is arranged in the front of each areal model 12, for measuring the pressure field of each areal model 12, arrange electrode measurement point at the back side of each areal model 12, for measuring flow field change situation and the saturation field situation of change of each areal model 12;
Measurement mechanism 13, for gather measure multiple areal model 12 pressure field, flow field and saturation field;
In the present embodiment, the making of areal model is according to specific experiment, and adopt the saturating sandstone flat panel enclosure of the Natural Low-permeable of different permeability to form respectively by the different substratums in stratified reservoir, physical dimension and well pattern type can be determined according to the needs of specific experiment.Injection-production well and pressure measurement point is arranged in areal model 12 front, experimental needs can simulate producing well waterfrac treatment by slot, potential electrode is arranged, for measure in single-phase experiment saturation field situation of change in the experiment of flow field change situation and two-phase according to resistivity method at areal model 12 back side.Electrode wires is undertaken cementing by conducting resinl and areal model 12.After pressure-measuring-point and resistance point layout, with epoxy resin, integral cast is carried out to areal model 12.After sealing consolidation, areal model 12 is vacuumized; In vacuum on areal model 12 Bonding pressure table, ensure vacuum fully carry out.It is tentatively saturated that application external atmosphere pressure carries out local water, finally in areal model 12, injects local water with displacement pump, build the pressure 24 hours, then by static for areal model 12 placement 48 hours, to make areal model 12 saturated local water sufficiently uniformly.
Figure 2 shows that the structural representation of the injection device of the embodiment of the present invention.As shown in Figure 2, injection device 11 comprises: nitrogen cylinder 111, voltage stabilizing instrument 112 and intermediate receptacle 113; Wherein,
Nitrogen cylinder 111, transfers to intermediate receptacle 113 for providing source of the gas through voltage stabilizing instrument 112;
Voltage stabilizing instrument 112, is arranged between nitrogen cylinder 111 and intermediate receptacle 113, for controlling described source of the gas, ensures to provide the supply pressure of continous-stable to intermediate receptacle 113.
Intermediate receptacle 113, for producing displacement fluid according to described source of the gas, and by described displacement fluid injection plane model 12.
In another embodiment, injection device 11 also can realize the injection of displacement fluid by high precision displacement pump.
Fig. 3 is the structural representation of the measurement mechanism of the embodiment of the present invention.As shown in Figure 3, measurement mechanism 13 comprises: multi-channel data acquisition device 131, resistivity measuring instrument 132, pressure logging 133 and computing machine 134; Wherein,
Multi-channel data acquisition device 131, connects each areal model 12 respectively, for the resistivity between each electrode measurement point that acquisition plane model 12 back side is arranged;
Resistivity measuring instrument 132, is connected to multi-path collector 131, for measuring the numerical value of the resistivity that multi-channel data acquisition device 131 gathers, and generating flow field and the saturation field of areal model 12 according to the numerical evaluation of resistivity, sending to computing machine 134 record;
In the present embodiment, resistivity measuring instrument principle of work is as follows:
Rock core resistivity and local water ion concentration value are functional relation:
R=f(a)f(b)
In formula, R is resistivity, and f (a) represents the function relevant with lithology, and f (b) represents and concentration dependent function.F (a) functional relation is difficult to set up.In order to address this problem, the small sample of model of appearing is adopted to carry out demarcating.Method is as follows: record the rock core resistivity data under a series of different ions concentration in large-sized model first in an experiment, the resistivity under it and same fixed concentration is carried out ratio.For same position, following formula can be obtained:
In formula, I is resistivity ratio, R
0for the resistivity under same fixed concentration.
Carry out calibration experiment with the parallel rock sample of model of appearing again, obtain the relation of mineralized water ion concentration and resistivity ratio, so to measure in large-sized model the mineralized water ion concentration that certain any resistivity just can obtain certain any that moment.
Pressure logging 133, connects each areal model 12 respectively, gathers the pressure field of each pressure measurement point that measurement plane model 12 front is arranged, and pressure field is sent to computing machine 134 record.
Pressure logging is a kind of industrial measurement and control instrument, it can with pressure transducer with the use of, circling measurment can be carried out to multichannel pressure experiment procedure parameter, controlling alarm, change send output, data acquisition and communication.Pressure logging is a kind of comparatively ripe industrial measurement and control instrument, therefore its principle of work is not repeated herein.
In a specific embodiment of the present invention, areal model 12 back side arrange electrode measurement point distribution as shown in Figure 4: on areal model 12, be provided with 9 electrode measurement points according to sphere of movements for the elephants, be numbered respectively: 1,2,3,4,5,6,7,8,9; Experiment needs to test adjacent 2, namely (1,2), (1,4), (1,5), (2,3), (2,4), (2,5), (2,6), (3,5), (3,6), (4,5), (4,7), (4,8), (5,6), (5,7), (5,8), (5,9), (6,8), (6,9) resistivity, between (7,8), (8,9) is tested.
According to old measuring method, above 20 pairs of electrode wires must be connected, and must by corresponding with channel number for the position of electrode wires.
In the present embodiment, in multi-channel data acquisition device, be provided with a control chip (single-chip microcomputer), form the circuit diagram as Fig. 5.Wherein, first by the 1-9 electrode measurement point on areal model 12 according to the one end being sequentially connected to electrode contact in circuit, then by the other end of 1-9 electrode measurement point street electrode contact; Data file write by computing machine 134, and form is txt file, and particular content is:
Begin:1:(1,2);2:(1,4);3:(1,5);4:(2,3);5:(2,4);6:(2,5);7:(2,6);8:(3,5);9:(3,6);10:(4,5);11:(4,7);12:(4,8);13:(5,6);14:(5,7);15:(5,8);16:(5,9);17:(6,8);18:(6,9);19:(7,8);20:(8,9);end
Above data file is transferred to control chip by computing machine 14, the electronic switch that the sequential control that control chip control circuit sets according to data file is different, resistivity between Different electrodes measurement point is gathered, then by resistance measuring instrument 132, the resistivity gathered is measured, obtain the numerical value of resistivity, and generate flow field and the saturation field of areal model 12 according to the numerical evaluation of resistivity, and be transferred to computing machine 134 and carry out record.
Computing machine 134 is connected to resistivity measuring instrument 132 and pressure logging 133, records and shows flow field, saturation field and pressure field.The last particular location determining each passage according to data file, carries out the process of data.The electrode measurement point measured is more, and advantage of the present utility model is more obvious.
Composition graphs 1 to Fig. 3, Fig. 6 are the system architecture schematic diagram of another embodiment of the present invention.As shown in Figure 6, described system also comprises a providing device 14, and providing device 14 comprises: micro-flowmeter 141 and electronic balance 142; Wherein,
Micro-flowmeter 141 connects areal model 12 described in each and described electronic balance 142 respectively, for the speed of the produced fluid of measurement plane model 12;
Electronic balance 142 is connected to micro-flowmeter 141, for the output of the produced fluid of measurement plane model 12.
In actual experiment, after the pressure stability of flat plate model 12, can measure by micro-flowmeter 141 and electronic balance 142 fluid velocity and fluid-withdrawal rate that reach stable rear plate model 12.
The present invention to compare in prior art for the blank of flat plate model in research commingling production experimental technique, has invented a kind of infiltration oil reservoir commingling production physical simulation system, automatically can record pressure field and the flow field of each layering when commingling production is tested.
Composition graphs 1 to Fig. 6, Fig. 7 are the flow chart of steps of the infiltration oil reservoir commingling production physical simulating method of the embodiment of the present invention.As shown in Figure 7, described method comprises:
Step S701, selects multiple areal model 12 as required.
In the present embodiment, the making of areal model 12 is according to specific experiment, and adopt the saturating sandstone flat panel enclosure of the Natural Low-permeable of different permeability to form respectively by the different substratums in stratified reservoir, physical dimension and well pattern type can be determined according to the needs of specific experiment.Injection-production well and pressure measurement point is arranged in areal model 12 front, experimental needs can simulate producing well waterfrac treatment by slot, potential electrode is arranged, for measure in single-phase experiment saturation field situation of change in the experiment of flow field change situation and two-phase according to resistivity method at areal model 12 back side.Electrode wires is undertaken cementing by conducting resinl and areal model 12.After pressure-measuring-point and resistance point layout, with epoxy resin, integral cast is carried out to areal model 12.After sealing consolidation, areal model 12 is vacuumized; In vacuum on areal model 12 Bonding pressure table, ensure vacuum fully carry out.It is tentatively saturated that application external atmosphere pressure carries out local water, finally in areal model 12, injects local water with displacement pump, build the pressure 24 hours, then by static for areal model 12 placement 48 hours, to make areal model 12 saturated local water sufficiently uniformly.
Step S702, is injected into described multiple areal model 12 by displacement fluid.
In the present embodiment, displacement fluid can pass through in nitrogen cylinder 111, voltage stabilizing instrument 112 and intermediate receptacle 113 injection plane model 12.In another embodiment, displacement fluid can be realized in injection plane model 12 by high precision displacement pump.
Step S703, gathers the pressure field of the described multiple areal model 12 of measurement, flow field and saturation field.
In the present embodiment, can input one control program be passed through, measure flow field and the saturation field of multiple areal model 12 according to described control program collection.Concretely, be first numbered the electrode measurement point on areal model 12, computing machine 134 is write data file (form is txt file), and particular content is as follows:
Begin:1:(1,2);2:(1,4);3:(1,5);4:(2,3);5:(2,4);6:(2,5);7:(2,6);8:(3,5);9:(3,6);10:(4,5);11:(4,7);12:(4,8);13:(5,6);14:(5,7);15:(5,8);16:(5,9);17:(6,8);18:(6,9);19:(7,8);20:(8,9);end
The acquisition order set by data file measures the numerical value of the resistivity between Different electrodes measurement point, by calculating flow field and the saturation field of areal model 12.
The present invention compares in prior art for the blank of flat plate model in research commingling production experimental technique, invent a kind of infiltration oil reservoir commingling production physical simulation system and method, automatically can record pressure field and the flow field of each layering when commingling production is tested.When simulating stratified reservoir exploitation, the pressure change on stream of every one deck can be understood respectively and flow field change understands oil reservoir development rule, evaluating the basis of existing development effectiveness and next step plan for adjustment of formulation.Existing experimental technique can not measure pressure field and flow field simultaneously at present, thus perfect not to the analysis of experimental result; Measure while present invention achieves the pressure field of stratified reservoir performance history physical simulation experiment and flow field.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a low-permeability oil deposit commingling production physical simulation system, is characterized in that, comprising: injection device, multiple areal model and measurement mechanism; Described injection device is connected with areal model described in each, and areal model described in each is connected with described measurement mechanism, wherein,
Described injection device, for being injected in described multiple areal model by displacement fluid;
Described multiple areal model, is formed by the saturating sandstone flat panel enclosure of the Natural Low-permeable of different permeability, for simulating the different substratums of stratified reservoir;
Wherein, in areal model described in each, be provided with electrode wires, undertaken cementing by conducting resinl and described areal model; Described in each, pressure measurement point is arranged in the front of areal model, for measuring the pressure field of the pressure measurement point of areal model described in each, and electrode measurement point is arranged, for measuring flow field and the saturation field of areal model described in each in the back side of areal model described in each; Described in each, described pressure measurement point is arranged in areal model front, and the back side carries out integral cast with epoxy resin to model after arranging described electrode measurement point;
Described measurement mechanism, for gathering the described pressure field of areal model described in each, flow field and saturation field;
Wherein, described measurement mechanism comprises: multi-channel data acquisition device, resistivity measuring instrument, pressure logging, computing machine; Wherein,
Described multi-channel data acquisition device, connects areal model described in each, for the resistivity gathering on described areal model described in each between electrode measurement point, is sent to described resistivity measuring instrument;
Described resistivity measuring instrument, connects described multi-channel data acquisition device, for measuring the numerical value of described resistivity, and generating the flow field of described areal model and described saturation field according to the numerical evaluation of described resistivity, sending to described computer recording;
Described pressure logging, connects areal model described in each, gathers the pressure field measuring pressure measurement point described in each on described areal model, and described pressure field is sent to described computer recording;
Described computing machine is connected to described resistivity measuring instrument and described pressure logging, records and shows described flow field, saturation field and pressure field.
2. low-permeability oil deposit commingling production physical simulation system according to claim 1, is characterized in that, described injection device comprises a nitrogen cylinder, intermediate receptacle and voltage stabilizing instrument; Wherein,
Described nitrogen cylinder, is connected to described voltage stabilizing instrument, for described intermediate receptacle provides source of the gas;
Described voltage stabilizing instrument, is connected to described intermediate receptacle, for controlling described source of the gas, ensures to provide the supply pressure of continous-stable to described intermediate receptacle;
Described intermediate receptacle, is connected to areal model described in each, produces displacement fluid, and described displacement fluid is injected areal model described in each according to described source of the gas.
3. low-permeability oil deposit commingling production physical simulation system according to claim 1, is characterized in that, described injection device comprises a high precision displacement pump, is connected to areal model described in each, injects areal model described in each for generation of displacement fluid.
4. low-permeability oil deposit commingling production physical simulation system according to claim 1, it is characterized in that, described multi-channel data acquisition device is also for gathering the resistivity described in each between electrode measurement point according to the described multi-channel data acquisition device of control of control program of user's setting.
5. low-permeability oil deposit commingling production physical simulation system according to claim 1, it is characterized in that, described system also comprises providing device, and described providing device connects areal model described in each, comprises micro-flowmeter and electronic balance; Wherein,
Described micro-flowmeter connects areal model described in each and described electronic balance, for measuring the speed of the produced fluid of described areal model;
Described electronic balance is connected to described micro-flowmeter, for measuring the output of the produced fluid of described areal model.
6. utilize a low-permeability oil deposit commingling production physical simulating method for the low-permeability oil deposit commingling production physical simulation system described in claim 1, it is characterized in that, comprising:
Select multiple areal model as required;
Displacement fluid is injected into described multiple areal model;
Gather the pressure field of the described multiple areal model of measurement, flow field and saturation field.
7. low-permeability oil deposit commingling production physical simulating method according to claim 6, is characterized in that, described collection is measured the pressure field of described multiple areal model, flow field and saturation field and also comprised:
Input a control program, measure flow field and the saturation field of described multiple areal model according to described control program collection.
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