CN104297123A - Potential-based spontaneous percolation measuring device - Google Patents
Potential-based spontaneous percolation measuring device Download PDFInfo
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- CN104297123A CN104297123A CN201410465014.0A CN201410465014A CN104297123A CN 104297123 A CN104297123 A CN 104297123A CN 201410465014 A CN201410465014 A CN 201410465014A CN 104297123 A CN104297123 A CN 104297123A
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Abstract
The invention discloses a potential-based spontaneous percolation measuring device which comprises a confining pressure control system, a potential monitoring system and a pressure difference control system. The confining pressure control system comprises a rack, a rubber cylinder, a core, a confining pressure valve, a confining pressure pump and hydraulic oil. The potential monitoring system comprises a constant-voltage power supply, a mesh-shaped positive electrode, a meshed-shaped negative electrode, a data transmission line, a potential measuring sheet and a fixed-value resistor disc. The pressure difference control system comprises a pressure meter, a water storage space, a communicating pipe, a pond, a communicating valve, a hand pump and an emptying valve. The potential-based spontaneous percolation measuring device is simple in structure, easy to realize, and capable of monitoring the change of saturability on all circumferential places of the core in a spontaneous percolation process over time; the potential-based spontaneous percolation measuring device is capable of measuring the change of the saturability of the core in the spontaneous percolation process over time under the condition of applying different confining pressures; the potential-based spontaneous percolation measuring device is further capable of measuring the change of the saturability of the core in a displacement process over time under the condition of applying different pressure differences to two ends of the core, and knowing parameters such as a water absorption rate, a capillary force and a water absorption quality of the core.
Description
Technical field
The invention belongs to petroleum engineering technical field, relate to the spontaneous imbibition measuring technique of rock core, particularly relate to a kind of spontaneous imbibition measurement mechanism based on electromotive force.
Background technology
At present, be that the unconventional reservoir of representative has fine and close feature with shale gas, its exploitation needs carry out extensive waterfrac treatment, and a large amount of water injects stratum, and therefore, evaluating the spontaneous imbibition rule of reservoir rock is one of key issue of unconventionaloil pool development research.This mainly contains the reason of following several respects: first, and because the pore throat of compact reservoir is tiny, venturi distribution many places are in micro-nano rank, and the spontaneous imbibition phenomena that capillary force causes is more more obvious than conventional reservoir, and the impact produced reservoir is larger; Secondly, the water-intake capacity of this type of reservoir depends on lithology, stratum and the artificial kind of liquid injected, and needs to carry out large batch of self-priming experimental study compact reservoir and the interaction of manually injecting liquid; Finally, the nonuniformity of this type of reservoir is comparatively strong, especially in shale gas drilling process, needs repeatedly to sample evaluation to the shale of Different Strata or same stratum diverse location.
With shale gas be the fracturing fluid recovery (backflow) rate of the unconventional reservoir of representative often lower than 50%, a large amount of fracturing liquid is detained in the earth formation.This type of reservoir is grown usually micro-nano hole, because its pore throat is tiny, hollow billet effect strengthens greatly, fracturing liquid enters matrix by crack by self-priming effect, form Water trapping and cause the fracturing liquid not easily row of returning, different fracturing liquids is due to differences such as its surface tension, wetting state, formation properties, and its self-priming difference between the effects is larger.
Because the pore throat of compact rock core is tiny, its test duration needed for spontaneous imbibition experiment is longer, test period is more vulnerable to the impact of environment temperature, humidity change, so traditional test methods cannot meet the requirement of measuring accuracy, and the regularity of distribution and the rule over time of fluid saturation in rock core cannot be obtained.
Method conventional is at present soaked in core container, and can measure the glass tube of the height of water in a termination one of cylinder, and use video camera to monitor for liquid level in glass tube.After rock sample water suction, the liquid level in glass tube declines, and record liquid level falling head over time, then passes through the product of glass tube cross-sectional area and liquid level falling head, calculates rock and sucks the quality of water over time.But this measuring method exists some personal errors, measurement result can be caused inaccurate, this measurement mechanism can only be measured whole rock core and suck the quality of water over time in addition, has certain limitation.
Summary of the invention
For solving problems of the prior art, the invention provides a kind of spontaneous imbibition measurement mechanism based on electromotive force, comprising confined pressure control system, also comprise electromotive force monitoring system and pressure reduction control system.
Measurement mechanism tool of the present invention has the following advantages: structure is simple, is easy to realize, can monitors circumference saturation degree situation over time everywhere in the spontaneous imbibition process of rock core, can be used for the various possible displacement pattern from piston-like displacement to non piston like displacement; Can measure under the condition applying different confined pressure, the rock core saturation degree situation over time in spontaneous imbibition process, understands the parameters such as the rate of water absorption of this rock sample, capillary force, water absorbing capacity; Can measure under rock core two ends apply the condition of different pressure reduction, the rock core saturation degree situation over time in displacement process, understands the parameters such as this rock sample rate of water absorption, capillary force, water suction quality.
Preferably, described confined pressure control system comprises frame, rubber tube, rock core, confined pressure valve, confined pressure pump, hydraulic oil.
In above-mentioned either a program preferably, the top of described frame is cylinder, and bottom is water space.Described cylinder is made up of stainless steel material.The intensity of stainless steel material is high, and hardness is high, wearing quality and corrosion resistivity better.Without under confined pressure condition, rock core can freely be put into or unload in cylinder.
In above-mentioned either a program preferably, described rubber tube is positioned between cylinder and rock core, and described rock core is positioned in rubber tube, and described confined pressure valve and described confined pressure pump are positioned over the outside of cylinder, and be connected with described rubber tube, be filled with hydraulic oil in described rubber tube.
Hydraulic oil can apply confined pressure to rock core.After opening confined pressure valve, regulate confined pressure pump, and to injection liquid force feed in rubber tube, rubber tube ensures the sealing of rock core cylinder while applying confined pressure to rock core.
In above-mentioned either a program preferably, described electromotive force monitoring system comprises constant voltage source, netted positive electrode, netted negative electrode, data line, potential measurement sheet, fixed value resistance sheet.
In above-mentioned either a program preferably, described constant voltage source is connected with netted negative electrode with netted positive electrode by wire, described netted positive electrode is positioned over rock core top, described netted negative electrode is positioned over rock core bottom, described fixed value resistance sheet is positioned between netted positive electrode and rock core top, and described potential measurement sheet is connected with described data line.
In above-mentioned either a program preferably, the quantity of described potential measurement sheet is at least four.The present invention is through experimental results demonstrate, at least four potential measurement sheets can guarantee the Potential Distributing measuring each orientation, prevent the strong nonuniformity of rock core on the impact of measurement result, and can according to the Potential Distributing in measurement result inverting space, potential measurement sheet is more, and electromotive force space distribution measurement result is more accurate.
In above-mentioned either a program preferably, the quantity of described potential measurement sheet is 12.
Each potential measurement sheet all connects a data line, and all data lines are all connected with computing machine, or all data lines pool a total data line, then is connected with computing machine.
In above-mentioned either a program preferably, described potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of described rubber tube.
In above-mentioned either a program preferably, described fixed value resistance sheet is cylindrical, the equal diameters of its diameter and described rock core, or approximately equal.This fixed value resistance sheet is the conductor of the columniform naked body parcel of known resistivity.
In above-mentioned either a program preferably, described potential measurement sheet comprises measuring sonde, wire, electric potential sensor, zero line, data line.
In above-mentioned either a program preferably, described measuring sonde is connected by wire one end with described electric potential sensor, and the other end of described electric potential sensor is connected with described zero line by wire, and described zero line is connected with netted negative electrode.
In above-mentioned either a program preferably, described measuring sonde is uniformly distributed on potential measurement sheet along the length direction of potential measurement sheet.
In electromotive force monitoring system, constant voltage source applies electric potential difference by wire and mesh electrode to rock core two ends, potential measurement sheet is close to core surface by confined pressure effect, zero line is connected with netted negative electrode formation zero gesture line, each electric potential sensor two ends is connected with zero line with measuring sonde respectively by wire, the electric potential difference data that electric potential sensor is responded to export computing machine to by data line, and store in real time on computers.
In above-mentioned either a program preferably, described pressure reduction control system comprises tensimeter, water space, communicating pipe, pond, communicating valve, wobble pump, atmospheric valve.The volume in described pond is enough large, and pond to be communicated with the water space of frame lower by communicating pipe and to form linker.Tensimeter is for showing the force value of rock core bottom.
In above-mentioned either a program preferably, described tensimeter is connected with described water space, and be positioned on same level line with described rock core bottom, described pond is by being connected with water space described communicating pipe, described wobble pump is connected with pond by described communicating valve, and described atmospheric valve is arranged at the top in pond.
Measurement mechanism of the present invention can measure the spontaneous imbibition water saturation of rock core situation over time under confined pressure, and under different confined pressure effect, the relation between the spontaneous imbibition character of rock core and stress sensitive.
The present invention also provides a kind of measuring method utilizing the above-mentioned spontaneous imbibition measurement mechanism based on electromotive force, comprises the following steps:
(1) debug measurement device, and the impermeability of check measurement device;
(2) rock core is dried extremely without free water state, and be positioned in rubber tube;
(3) open confined pressure valve, regulate confined pressure pump, after the confined pressure of rock core is risen to certain value, close confined pressure valve;
(4) open constant voltage source, record the electric potential difference between each adjacent measuring sonde, and export measurement data to computing machine by data line;
(5) open atmospheric valve and communicating valve, regulate wobble pump, make the water surface in water space just contact rock core bottom, now start to record the electromotive force of each measuring sonde over time;
(6), after the time to be batched reaches and measure and require, open confined pressure valve, regulate confined pressure pump, the confined pressure of unloading rock core, is positioned over to state of saturation in pond after removal of core, and is positioned in rubber tube by the rock core of state of saturation;
(7) open confined pressure valve, regulate confined pressure pump, after the confined pressure of rock core is risen to certain value, close confined pressure valve;
(8) open constant voltage source, record the electric potential difference between each adjacent measuring sonde, and export measurement data to computing machine by data line;
(9) by the data analysis of computer recording, solve each parameter, evaluate the spontaneous imbibition rule of rock core;
Described measurement mechanism is a kind of spontaneous imbibition measurement mechanism based on electromotive force.
Be worth equal with step (7) to the confined pressure that the rock core of state of saturation applies to the confined pressure value that the rock core without free water state applies in step (3).Rock core has the characteristic of stress sensitive, if rock core is worth unequal with confined pressure applied in the saturated condition under without free water state, then the porosity of rock core is also different, and measurement can be caused to occur error, affect measurement result, therefore can accurately not characterize the spontaneous imbibition rule of rock core.
Measuring method of the present invention is by using the above-mentioned spontaneous imbibition measurement mechanism based on electromotive force to apply electric potential difference to rock core, measure core surface each point electromotive force, monitoring rock core is to the interfacial level of the spontaneous imbibitions of various liquid such as fracturing liquid, and on rock core this liquid saturation distribution over time, the parameter such as rate of water absorption, capillary force, water suction quality of real-time grasp sample, characterize the spontaneous imbibition rule of compact rock core more accurately, for site operation proposes guidance instruction, also for evaluating reservoir provides rational basis.
Preferably, the described spontaneous imbibition measurement mechanism based on electromotive force comprises confined pressure control system, electromotive force monitoring system, pressure reduction control system.
In above-mentioned either a program preferably, described confined pressure control system comprises frame, rubber tube, rock core, confined pressure valve, confined pressure pump, hydraulic oil.
In above-mentioned either a program preferably, described electromotive force monitoring system comprises constant voltage source, netted positive electrode, netted negative electrode, data line, potential measurement sheet, fixed value resistance sheet.
In above-mentioned either a program preferably, described pressure reduction control system comprises tensimeter, water space, communicating pipe, pond, communicating valve, wobble pump, atmospheric valve.
When carrying out spontaneous imbibition and measuring, open atmospheric valve and communicating valve, by the liquid level in wobble pump adjustment pond, make it consistent with the height of netted negative electrode, and manometric gauge pressure is zero, thus keeps the two ends of rock core without pressure reduction; When carrying out displacement and measuring, close atmospheric valve, open communicating valve, pressurizeed to water space by wobble pump, make the two ends of rock core keep level pressure.By each point electromotive force in the variation monitoring rock core circumference of each electric potential sensor numerical value, judge that rock core sucks the genesis analysis situation of liquid saturation in rock core.
Major design principle of the present invention manufactures electric potential difference at rock core two ends, at rubber tube inwall circumferentially uniform at least four potential measurement sheets, when after filling liquid force feed in rubber tube, make potential measurement sheet be close to core surface, the measuring sonde that potential measurement sheet is equally spaced also is close to rock core.The isodiametric fixed value resistance sheet with rock core is put on rock core top, the resistivity of this fixed value resistance sheet is known, so, rock core and fixed value resistance sheet form series circuit, the electric current passed through is equal, because the distance of adjacent measuring sonde is equal, according to circuit philosophy, the ratio of the electric potential difference on the electric potential difference on rock core between certain adjacent measuring sonde and fixed value resistance sheet between adjacent measuring sonde is then had to equal the ratio of the resistivity of rock core between this measuring sonde on rock core and the resistivity of fixed value resistance sheet, namely
Wherein, ρ
rock coreand ρ
fixed value resistance sheetrepresent the resistivity of rock core on rock core between certain two adjacent measuring sonde and the resistivity of fixed value resistance sheet respectively; U
rock coreand U
fixed value resistance sheetrepresent the electric potential difference of rock core on rock core between certain two adjacent measuring sonde and the electric potential difference of fixed value resistance sheet respectively.
Suppose rock core resistivity and water saturation linear, then rock core water suction after, the resistivity on rock core can change.Rock core is dried to after only having irreducible water, and the resistivity of the rock core between adjacent two measuring sondes is ρ
wi, water saturation is S
wi, after rock core saturation water, the resistivity of the rock core between adjacent two measuring sondes is ρ
s, water saturation is S
s, so, if the electricalresistivityρ of the rock core on known rock core between adjacent two measuring sondes
i, then the saturation degree S at this place can be calculated
i:
Therefore, through type (1) is known, the electric potential difference on known rock core between each measuring sonde, just the resistivity distribution on this moment rock core can be known, through type (2) is known, and the resistivity distribution on known rock core just can calculate the distribution of the water saturation on rock core.Therefore, by the monitoring to core surface Potential Distributing, the distribution of rock core saturation degree can be calculated, thus observe the change of rock core saturation degree in the rising situation of piston type spontaneous imbibition process median surface and non-piston type water absorption course, and then the parameter such as rate of water absorption, capillary force, water absorbing capacity of understanding rock sample, characterize the spontaneous imbibition rule of compact rock core more accurately, for site operation proposes guidance instruction, also for evaluating reservoir provides rational basis.
Carry out the spontaneous imbibition experiment of rock core, monitoring rock core saturation degree over time situation time, because water space and the pond with enough large volume form linker structure, open atmospheric valve and communicating valve, by the liquid level in wobble pump adjustment pond, make it consistent with netted negative electrode height, and manometric gauge pressure is zero, thus keeps the two ends of rock core without pressure reduction.If need to manufacture pressure reduction to rock core two ends, then close atmospheric valve, open communicating valve, pressurizeed by wobble pump to water space, make the two ends of rock core keep level pressure, pressure difference can be read by tensimeter.Further, by regulating confined pressure pump, the spontaneous water suction situation of rock under different confined pressure can be monitored.
Accompanying drawing explanation
Fig. 1 is the preferred embodiment schematic diagram according to the spontaneous imbibition measurement mechanism based on electromotive force of the present invention;
Fig. 2 is the preferred embodiment schematic diagram according to the potential measurement sheet in the rubber tube of the spontaneous imbibition measurement mechanism based on electromotive force of the present invention;
Fig. 3 is the A place enlarged drawing of the potential measurement sheet in rubber tube shown in the Fig. 2 according to the spontaneous imbibition measurement mechanism based on electromotive force of the present invention;
Fig. 4 is the schematic top plan view according to the netted positive electrode in the electromotive force monitoring system of the spontaneous imbibition measurement mechanism based on electromotive force of the present invention and netted negative electrode;
Fig. 5 is another preferred embodiment schematic diagram according to the potential measurement sheet in the rubber tube of the spontaneous imbibition measurement mechanism based on electromotive force of the present invention;
Fig. 6 is the process chart of the measuring method according to the spontaneous imbibition measurement mechanism based on electromotive force of the present invention;
Fig. 7 is the rock core Absorb Water quality change curve in time according to the spontaneous imbibition measurement mechanism based on electromotive force of the present invention;
Fig. 8 is the rock core Absorb Water quality square root change curve in time according to the spontaneous imbibition measurement mechanism based on electromotive force of the present invention.
Figure labeling description: 1-frame, 2-rubber tube, 3-rock core, 4-confined pressure valve, 5-confined pressure pump, 6-hydraulic oil, 7-cylinder, 8-water space, 9-constant voltage source, the netted positive electrode of 10-, the netted negative electrode of 11-, 12-data line, 13-potential measurement sheet, 14-fixed value resistance sheet, 15-measuring sonde, 16-wire, 17 electric potential sensor, 18-zero line, 19-tensimeter, 20-communicating pipe, 21-pond, 22-communicating valve, 23-wobble pump, 24-atmospheric valve.
Embodiment
In order to further understand summary of the invention of the present invention, elaborate the present invention below in conjunction with specific embodiment.
Embodiment one:
As shown in Figure 1, a kind of spontaneous imbibition measurement mechanism based on electromotive force, comprises confined pressure control system, electromotive force monitoring system and pressure reduction control system.
Confined pressure control system comprises frame 1, rubber tube 2, rock core 3, confined pressure valve 4, confined pressure pump 5, hydraulic oil 6.The top of frame 1 is cylinder 7, and bottom is water space 8.Cylinder 7 is made up of stainless steel material.Rubber tube 2 is positioned between cylinder 7 and rock core 3, and rock core 3 is positioned in rubber tube 2, and confined pressure valve 4 and confined pressure pump 5 are positioned over the outside of cylinder 7, and are connected with rubber tube 2, are filled with hydraulic oil 6 in rubber tube 2.Hydraulic oil can apply confined pressure to rock core.After opening confined pressure valve, regulate confined pressure pump, and to injection liquid force feed in rubber tube, rubber tube ensures the sealing of rock core cylinder while applying confined pressure to rock core.
Electromotive force monitoring system comprises constant voltage source 9, netted positive electrode 10, netted negative electrode 11, data line 12, potential measurement sheet 13, fixed value resistance sheet 14.Constant voltage source 9 is connected with netted negative electrode 11 with netted positive electrode 10 by wire, netted positive electrode 10 is positioned over rock core 3 top, netted negative electrode 11 is positioned over rock core 3 bottom, fixed value resistance sheet 14 is positioned between netted positive electrode 10 and rock core 3 top, and potential measurement sheet 13 is connected with data line 12.Fixed value resistance sheet is cylindrical, the equal diameters of its diameter and rock core.This fixed value resistance sheet is the conductor of the columniform naked body parcel of known resistivity.
Pressure reduction control system comprises tensimeter 19, water space 8, communicating pipe 20, pond 21, communicating valve 22, wobble pump 23, atmospheric valve 24.The volume in pond is enough large, and pond to be communicated with the water space of frame lower by communicating pipe and to form linker.The force value of tensimeter display rock core bottom.Tensimeter 19 is connected with water space 8, and is positioned on same level line with rock core 3 bottom, and pond 21 is by being connected with water space 8 communicating pipe 20, and wobble pump 23 is connected with pond 21 by communicating valve 22, and atmospheric valve 24 is arranged at the top in pond 21.
As shown in Figure 2, the quantity of potential measurement sheet 13 is four.Each potential measurement sheet 12 all connects a data line 12, and all data lines 12 are all connected with computing machine.Potential measurement sheet 13 is uniformly distributed on the inwall of rubber tube 2 along the circumference of rubber tube 2.
As shown in Figure 3, potential measurement sheet 13 comprises measuring sonde 15, wire 16, electric potential sensor 17, zero line 18, data line 12.Measuring sonde 15 is connected by wire 16 one end with electric potential sensor 17, and the other end of electric potential sensor 17 is connected with zero line 18 by wire 16, and zero line 18 is connected with netted negative electrode 11.Measuring sonde 15 is uniformly distributed on potential measurement sheet 13 along the length direction of potential measurement sheet 13.
As shown in Figure 4, netted positive electrode 10 and netted negative electrode 11 have fine and close reticulate texture.
In electromotive force monitoring system, constant voltage source applies electric potential difference by wire and mesh electrode to rock core two ends, potential measurement sheet is close to core surface by confined pressure effect, zero line is connected with netted negative electrode formation zero gesture line, each electric potential sensor two ends is connected with zero line with measuring sonde respectively by wire, the electric potential difference data that electric potential sensor is responded to export computing machine to by data line, and store in real time on computers.
As shown in Figure 6, a kind of measuring method utilizing the above-mentioned spontaneous imbibition measurement mechanism based on electromotive force, comprises the following steps:
(1) debug measurement device, and the impermeability of check measurement device;
(2) rock core is dried extremely without free water state, and be positioned in rubber tube;
(3) open confined pressure valve, regulate confined pressure pump, after the confined pressure of rock core is risen to certain value, close confined pressure valve;
(4) open constant voltage source, record the electric potential difference between each adjacent measuring sonde, and export measurement data to computing machine by data line;
(5) open atmospheric valve and communicating valve, regulate wobble pump, make the water surface in water space just contact rock core bottom, now start to record the electromotive force of each measuring sonde over time;
(6), after the time to be batched reaches and measure and require, open confined pressure valve, regulate confined pressure pump, the confined pressure of unloading rock core, is positioned over to state of saturation in pond after removal of core, and is positioned in rubber tube by the rock core of state of saturation;
(7) open confined pressure valve, regulate confined pressure pump, after the confined pressure of rock core is risen to certain value, close confined pressure valve;
(8) open constant voltage source, record the electric potential difference between each adjacent measuring sonde, and export measurement data to computing machine by data line;
(9) by the data analysis of computer recording, solve each parameter, evaluate the spontaneous imbibition rule of rock core;
Measurement mechanism used is the above-mentioned spontaneous imbibition measurement mechanism based on electromotive force.Be worth equal with step (7) to the confined pressure that the rock core of state of saturation applies to the confined pressure value that the rock core without free water state applies in step (3).
Example is measured as with RZI-ZS sandstone Absorb Water, fluid is normal saline solution, be parallel to direction, stratum coring, core diameter is 2.5cm, length is 4.4cm, and dry weight (without free water state) is 51.5195g, and core porosity is 5.89%, the Absorb Water quality situation over time of rock core is recorded, as shown in Figure 7 by above-mentioned measurement mechanism and measuring method.
According to Handy (1960) model, the Absorb Water speed of rock core in unit area can be solved:
In formula, m-Absorb Water quality, g;
The area of s-self-priming water surface, cm
2;
T-Absorb Water time, s;
α-Absorb Water speed g/ (cm
2s
0.5).
After data processing, obtain the Absorb Water quality subduplicate situation of change in time of rock core, as shown in Figure 8.As shown in Figure 8, the matching of above-mentioned data straight-line segment is good, and this rock core imbibition rule meets Handy model, and the extend line intersection point of spontaneous imbibition section and diffuser is (70,1.2), therefore computational analysis obtains Absorb Water speed α=3.9199 × 10 further
-4g/ (cm
2s
0.5), the wetting phase saturation degree of point of intersection is displacement efficiency is 94.3%, and the time that intersection point is corresponding is time swap T is 4900s, and the residual saturation of non-wetted phase is 5.7%.
Embodiment two:
Based on spontaneous imbibition measurement mechanism and the measuring method of electromotive force, substantially identical with embodiment one, unlike, as shown in Figure 5, the quantity of potential measurement sheet is 12, and each potential measurement sheet all connects a data line, and all data lines are all connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Embodiment three:
A kind of spontaneous imbibition measurement mechanism based on electromotive force and measuring method, substantially identical with embodiment one, unlike, the quantity of potential measurement sheet is 16, each potential measurement sheet all connects a data line, and all data lines are all connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Embodiment four:
A kind of spontaneous imbibition measurement mechanism based on electromotive force and measuring method, substantially identical with embodiment one, unlike, the quantity of potential measurement sheet is 20, each potential measurement sheet all connects a data line, and all data lines are all connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Embodiment five:
A kind of spontaneous imbibition measurement mechanism based on electromotive force and measuring method, substantially identical with embodiment one, unlike, the quantity of potential measurement sheet is four, each potential measurement sheet all connects a data line, all data lines pool a total data line, then are connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Embodiment six:
A kind of spontaneous imbibition measurement mechanism based on electromotive force and measuring method, substantially identical with embodiment one, unlike, the quantity of potential measurement sheet is 12, each potential measurement sheet all connects a data line, all data lines pool a total data line, then are connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Embodiment seven:
A kind of spontaneous imbibition measurement mechanism based on electromotive force and measuring method, substantially identical with embodiment one, unlike, the quantity of potential measurement sheet is 16, each potential measurement sheet all connects a data line, all data lines pool a total data line, then are connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Embodiment eight:
A kind of spontaneous imbibition measurement mechanism based on electromotive force and measuring method, substantially identical with embodiment one, unlike, the quantity of potential measurement sheet is 20, each potential measurement sheet all connects a data line, all data lines pool a total data line, then are connected with computing machine.Potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of rubber tube.
Those skilled in the art are understood that, spontaneous imbibition measurement mechanism based on electromotive force of the present invention comprises the summary of the invention of the invention described above instructions and the combination in any of embodiment part and each several part shown by accompanying drawing, as space is limited and not have each scheme of these combination formations to describe one by one for making instructions simple and clear.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 (10)
1. based on a spontaneous imbibition measurement mechanism for electromotive force, comprise confined pressure control system, it is characterized in that: also comprise electromotive force monitoring system and pressure reduction control system.
2., as claimed in claim 1 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: described confined pressure control system comprises frame, rubber tube, rock core, confined pressure valve, confined pressure pump, hydraulic oil.
3., as claimed in claim 2 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: the top of described frame is cylinder, and bottom is water space.
4. as claimed in claim 3 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: described rubber tube is positioned between cylinder and rock core, described rock core is positioned in rubber tube, described confined pressure valve and described confined pressure pump are positioned over the outside of cylinder, and be connected with described rubber tube, be filled with hydraulic oil in described rubber tube.
5., as claimed in claim 1 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: described electromotive force monitoring system comprises constant voltage source, netted positive electrode, netted negative electrode, data line, potential measurement sheet, fixed value resistance sheet.
6. as claimed in claim 5 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: described constant voltage source is connected with netted negative electrode with netted positive electrode by wire, described netted positive electrode is positioned over rock core top, described netted negative electrode is positioned over rock core bottom, described fixed value resistance sheet is positioned between netted positive electrode and rock core top, and described potential measurement sheet is connected with described data line.
7., as claimed in claim 6 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: the quantity of described potential measurement sheet is at least four.
8., as claimed in claim 7 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: the quantity of described potential measurement sheet is 12.
9., as claimed in claim 7 or 8 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: described potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of described rubber tube.
10., as claimed in claim 6 based on the spontaneous imbibition measurement mechanism of electromotive force, it is characterized in that: described fixed value resistance sheet is cylindrical, the equal diameters of its diameter and described rock core.
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| CN104297124A (en) * | 2014-09-12 | 2015-01-21 | 中国石油大学(北京) | Spontaneous imbibition measurement method based on electric potential |
| CN105241778A (en) * | 2015-11-05 | 2016-01-13 | 中国石油大学(北京) | Spontaneous imbibition measurement apparatus and experiment method thereof |
| CN105628579A (en) * | 2015-12-21 | 2016-06-01 | 中国石油大学(北京) | Shale spontaneous imbibition measurement device |
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