CN104297124B - A kind of spontaneous imbibition measuring method based on electromotive force - Google Patents
A kind of spontaneous imbibition measuring method based on electromotive force Download PDFInfo
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- CN104297124B CN104297124B CN201410465214.6A CN201410465214A CN104297124B CN 104297124 B CN104297124 B CN 104297124B CN 201410465214 A CN201410465214 A CN 201410465214A CN 104297124 B CN104297124 B CN 104297124B
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Abstract
The invention discloses a kind of spontaneous imbibition measuring method based on electromotive force, comprise the following steps: rock core is dried to being positioned in rubber tube without after Free water state, and it is applied confined pressure；Open constant voltage source, record the electric potential difference between adjacent measuring probe；Regulate hand pump, make the water surface in water space just contact rock core bottom, record the electromotive force of each measuring probe over time；Unloading rock core confined pressure, is placed on pond and is positioned in rubber tube to saturation, and it is applied confined pressure；Open constant voltage source, record the electric potential difference between adjacent measuring probe；Analytical data, evaluates the spontaneous imbibition rule of rock core.This measuring method applies electric potential difference by the spontaneous imbibition measurement apparatus based on electromotive force to rock core, measure core surface each point electromotive force, the monitoring rock core interfacial level to spontaneous imbibitions of various liquid such as fracturing fluids, and this hold-up degree is distributed over time on rock core, grasp the parameters such as the rate of water absorption of sample, capillary force, water suction quality in real time.
Description
Technical field
The invention belongs to petroleum works technical field, relate to the spontaneous imbibition measurement technology of rock core, particularly relate to a kind of spontaneous imbibition measuring method based on electromotive force.
Background technology
At present, having fine and close feature with the unconventional reservoir that shale gas is representative, its exploitation needs carry out extensive fracturing, and substantial amounts of water injects stratum, and therefore, the evaluation spontaneous imbibition rule of reservoir rock is one of key issue of unconventionaloil pool developmental research.This mainly has the reason of following several respects: firstly, since the pore throat of compact reservoir is tiny, and it is other that venturi distribution is in micro/nano level more, and the spontaneous imbibition phenomena that capillary force causes becomes apparent from than conventional reservoir, and the impact that reservoir is produced is bigger；Secondly, the water absorbing capacity of this type of reservoir depends on lithology, stratum and the kind of liquid being artificially injected, it is necessary to carry out large batch of self-priming experimentation compact reservoir and the interaction being artificially injected liquid；Finally, the anisotropism of this type of reservoir is relatively strong, particularly in shale gas drilling process, it is necessary to the shale of Different Strata or same stratum diverse location is carried out the evaluation of many sub-samplings.
Being often below 50% with the fracturing fluid recovery (backflow) rate of unconventional reservoir that shale gas is representative, substantial amounts of fracturing fluid is detained in the earth formation.This type of reservoir is generally grown micro-nano hole, owing to its pore throat is tiny, hollow billet effect is greatly enhanced, fracturing fluid is entered substrate by crack by self-priming effect, form Water trapping and cause the fracturing fluid not easily row of returning, different fracturing fluids is due to differences such as its surface tension, wettability, formation properties, and its self-priming difference between the effects is bigger.
Owing to the pore throat of compact rock core is tiny, testing time needed for its spontaneous imbibition experiment is longer, the impact of ambient temperature, humidity change it is more vulnerable to during test, 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 at present is, will soak in core barrel, and the glass tubing of piece height that can measure water of termination at cylinder, and uses video camera to be monitored for liquid level in glass tubing.After rock sample absorbs water, the liquid level in glass tubing declines, and record liquid level falling head over time, again through the product of glass tubing cross-sectional area Yu liquid level falling head, calculates the quality of rock suction water over time.But this measuring method exists some personal errors, can cause that measurement result is inaccurate, additionally this measurement apparatus can only measure whole rock core suck water quality over time, have certain limitation.
Summary of the invention
For solving problems of the prior art, the present invention provides a kind of spontaneous imbibition measuring method based on electromotive force, comprises the following steps:
(1) debugging measurement apparatus, and the air-tightness of check measurement device；
(2) rock core is dried extremely without Free water state, and be placed 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 probe, and by measurement data by data line output to computer；
(5) open atmospheric valve and communicating valve, regulate hand pump, make the water surface in water space just contact rock core bottom, now start to record the electromotive force of each measuring probe over time；
(6) after the time to be batched reaches measurement requirement, open confined pressure valve, regulate confined pressure pump, the confined pressure of unloading rock core, be positioned in pond after removal of core to saturation, and the rock core of saturation is positioned in rubber tube；
(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 probe, and by measurement data by data line output to computer；
(9) data of computer recording are analyzed, solve each parameter, evaluate the spontaneous imbibition rule of rock core；
Described measurement apparatus is a kind of spontaneous imbibition measurement apparatus based on electromotive force.
The confined pressure value in step (3), the rock core without Free water state applied is equal with the confined pressure value in step (7), the rock core of saturation applied.Rock core has the characteristic of stress sensitive, if rock core is unequal with the confined pressure value applied in the saturated condition under without Free water state, then the porosity of rock core is also different, can cause that error occurs in measurement, affect measurement result, therefore can accurately not characterize the spontaneous imbibition rule of rock core.
The measuring method of the present invention is by using the above-mentioned spontaneous imbibition measurement apparatus based on electromotive force to apply electric potential difference to rock core, measure core surface each point electromotive force, the monitoring rock core interfacial level to spontaneous imbibitions of various liquid such as fracturing fluids, and on rock core the saturation distribution of this liquid is over time, real-time grasps the parameters such as the rate of water absorption of sample, capillary force, water suction quality, characterize the spontaneous imbibition rule of compact rock core more accurately, propose guidance instruction for site operation, also provide rational basis for evaluating reservoir.
When carrying out spontaneous imbibition and measuring, open atmospheric valve and communicating valve, adjusted the liquid level in pond by hand pump so that it is highly consistent with netted negative electrode, and manometric gauge pressure is zero, thus keeping 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 hand 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, it is judged that rock core sucks hold-up degree genesis analysis situation in rock core.
Preferably, the described spontaneous imbibition measurement apparatus based on electromotive force includes enclosing pressure control system, electromotive force monitoring system, pressure reduction control system.
This measurement apparatus has the advantage that simple in construction, it is easy to accomplish, the circumference situation over time of saturation everywhere in the spontaneous imbibition process of rock core can be monitored, can be used for the various possible displacement pattern from piston-like displacement to non piston like displacement；Can measure when applying different confined pressure, the rock core saturation situation over time in spontaneous imbibition process, understand the parameters such as the rate of water absorption of this rock sample, capillary force, water suction quality；Can measure when the different pressure reduction of rock core two ends applying, the rock core saturation situation over time in displacement process, understand the parameters such as this rock sample rate of water absorption, capillary force, water absorption.
In any of the above-described scheme preferably, enclose pressure control system described in and include frame, rubber tube, rock core, confined pressure valve, confined pressure pump, hydraulic oil.
In any of the above-described scheme 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, and wearability and corrosion resistance are better.Without confined pressure when, rock core can freely be put in cylinder or unload.
In any of the above-described scheme 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 are connected with described rubber tube, are filled with hydraulic oil in described rubber tube.
Rock core can be applied confined pressure by hydraulic oil.After opening confined pressure valve, regulating confined pressure pump, and inject hydraulic oil in rubber tube, rubber tube ensures core column face seal while rock core is applied confined pressure.
In any of the above-described scheme preferably, described electromotive force monitoring system includes constant voltage source, netted anelectrode, netted negative electrode, data line, potential measurement sheet, fixed value resistance sheet.
In any of the above-described scheme preferably, described constant voltage source is connected with netted anelectrode and netted negative electrode by wire, described netted anelectrode 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 anelectrode and rock core top, and described potential measurement sheet is connected with described data line.
In any of the above-described scheme 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 sheet can ensure that the Potential Distributing that can measure each orientation, prevent the impact on measurement result of the rock core strong anisotropism, and can according to the Potential Distributing in measurement result inverting space, potential measurement sheet is more many, and electromotive force spatial distribution measurement result is more accurate.
In any of the above-described scheme preferably, the quantity of described potential measurement sheet is 12.
Each potential measurement sheet is all connected with a data transmission line, and all of data line is all connected with computer, or all of data line pools a total data line, then is connected with computer.
In any of the above-described scheme preferably, described potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of described rubber tube.
In any of the above-described scheme 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 cylindrical naked body parcel of known resistivity.
In any of the above-described scheme preferably, described potential measurement sheet includes measuring probe, wire, electric potential sensor, zero line, data line.
In any of the above-described scheme preferably, described measuring probe is connected with one end of described electric potential sensor by wire, 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 any of the above-described scheme preferably, described measuring probe 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 and constitutes zero gesture line, each electric potential sensor two ends is connected with measuring probe and zero line respectively by wire, the electric potential difference data that electric potential sensor senses are exported to computer by data line, and store in real time on computers.
In any of the above-described scheme preferably, described pressure reduction control system includes Pressure gauge, water space, communicating pipe, pond, communicating valve, hand pump, atmospheric valve.The volume in described pond is sufficiently large, and pond by connecting composition linker communicating pipe with the water space of frame lower.Pressure gauge is for showing the force value of rock core bottom.
In any of the above-described scheme preferably, described Pressure gauge is connected with described water space, and it is positioned on same level line with described rock core bottom, described pond is by being connected with water space described communicating pipe, described hand pump is connected with pond by described communicating valve, and described atmospheric valve is arranged at the top in pond.
This measurement apparatus can measure the spontaneous imbibition water saturation situation over time of rock core under confined pressure, and under different confined pressure effects, the relation between the spontaneous imbibition character of rock core and stress sensitive.
The major design principle of the present invention is to manufacture electric potential difference at rock core two ends, it is evenly distributed at least four potential measurement sheet at rubber tube inwall, when after filling liquid force feed in rubber tube so that potential measurement sheet is close to core surface, and the measuring probe that potential measurement sheet is equally spaced also is close to rock core.Fixed value resistance sheet isodiametric 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 constitute series circuit, the electric current passed through is equal, owing to the distance of adjacent measuring probe is equal, according to circuit philosophy, then there is on rock core the ratio ratio equal to the resistivity of rock core between this measuring probe on rock core with the resistivity of fixed value resistance sheet of electric potential difference between certain adjacent measuring probe and the electric potential difference between adjacent measuring probe on fixed value resistance sheet, namely
Wherein, ρRock coreAnd ρFixed value resistance sheetRepresent on rock core the resistivity of rock core between certain two adjacent measuring probe and the resistivity of fixed value resistance sheet respectively；URock coreAnd UFixed value resistance sheetRepresent on rock core the electric potential difference of rock core between certain two adjacent measuring probe and the electric potential difference of fixed value resistance sheet respectively.
Assume that rock core resistivity and water saturation are linear, then, after rock core water suction, the resistivity on rock core can change.Rock core is dried to only irreducible water, and the resistivity of the rock core between adjacent two measuring probes is ρwi, water saturation is Swi, after rock core saturation water, the resistivity of the rock core between adjacent two measuring probes is ρs, water saturation is Ss, then, if it is known that the electricalresistivityρ of rock core between adjacent two measuring probes on rock corei, then the saturation S at this place can be calculatedi:
Therefore, through type (1) is it can be seen that electric potential difference between each measuring probe on known rock core, just may know that the resistivity distribution on this moment rock core, through type (2), it can be seen that resistivity distribution on known rock core, just can calculate the distribution of water saturation on rock core.Therefore, by the monitoring to core surface Potential Distributing, the distribution of rock core saturation can be calculated, thus observing the change of rock core saturation in the rising situation of piston type spontaneous imbibition process median surface and non-piston type water absorption course, and then recognize the parameters such as the rate of water absorption of rock sample, capillary force, water absorption, characterize the spontaneous imbibition rule of compact rock core more accurately, propose guidance instruction for site operation, also provide rational basis for evaluating reservoir.
Carry out the spontaneous imbibition experiment of rock core, during monitoring rock core saturation situation over time, owing to water space and the pond with sufficiently large volume constitute linker structure, open atmospheric valve and communicating valve, the liquid level in pond is adjusted by hand pump, make it highly consistent with netted negative electrode, and manometric gauge pressure is zero, thus keeping the two ends of rock core without pressure reduction.If needing rock core two ends are manufactured pressure reduction, then closing atmospheric valve, open communicating valve, pressurizeed to water space by hand pump, make the two ends of rock core keep level pressure, pressure difference can be read by Pressure gauge.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 process chart of the spontaneous imbibition measuring method based on electromotive force according to the present invention；
Fig. 2 is a preferred embodiment schematic diagram of the spontaneous imbibition measurement apparatus based on electromotive force used of the spontaneous imbibition measuring method based on electromotive force according to the present invention；
Fig. 3 is the preferred embodiment schematic diagram based on the potential measurement sheet in the rubber tube of the spontaneous imbibition measurement apparatus of electromotive force used of the spontaneous imbibition measuring method based on electromotive force according to the present invention；
Fig. 4 is the A place enlarged drawing based on the potential measurement sheet in rubber tube shown in Fig. 3 of the spontaneous imbibition measurement apparatus of electromotive force used of the spontaneous imbibition measuring method based on electromotive force according to the present invention；
Fig. 5 is the schematic top plan view based on the netted anelectrode in the electromotive force monitoring system of the spontaneous imbibition measurement apparatus of electromotive force and netted negative electrode used of the spontaneous imbibition measuring method based on electromotive force according to the present invention；
Fig. 6 is another preferred embodiment schematic diagram based on the potential measurement sheet in the rubber tube of the spontaneous imbibition measurement apparatus of electromotive force used of the spontaneous imbibition measuring method based on electromotive force according to the present invention；
Fig. 7 changes over curve according to the rock core Absorb Water quality based on the spontaneous imbibition measuring method of electromotive force of the present invention；
Fig. 8 is the rock core Absorb Water quality square root change curve in time of the spontaneous imbibition measuring method based on electromotive force according to 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 anelectrode of 10-, the netted negative electrode of 11-, 12-data line, 13-potential measurement sheet, 14-fixed value resistance sheet, 15-measuring probe, 16-wire, 17 electric potential sensor, 18-zero line, 19-Pressure gauge, 20-communicating pipe, 21-pond, 22-communicating valve, 23-hand pump, 24-atmospheric valve.
Detailed description of the invention
In order to be further understood that the summary of the invention of the present invention, elaborate the present invention below in conjunction with specific embodiment.
Embodiment one:
As it is shown in figure 1, a kind of spontaneous imbibition measuring method based on electromotive force, comprise the following steps:
(1) debugging measurement apparatus, and the air-tightness of check measurement device；
(2) rock core is dried extremely without Free water state, and be placed 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 probe, and by measurement data by data line output to computer；
(5) open atmospheric valve and communicating valve, regulate hand pump, make the water surface in water space just contact rock core bottom, now start to record the electromotive force of each measuring probe over time；
(6) after the time to be batched reaches measurement requirement, open confined pressure valve, regulate confined pressure pump, the confined pressure of unloading rock core, be positioned in pond after removal of core to saturation, and the rock core of saturation is positioned in rubber tube；
(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 probe, and by measurement data by data line output to computer；
(9) data of computer recording are analyzed, solve each parameter, evaluate the spontaneous imbibition rule of rock core；
Measurement apparatus used is a kind of spontaneous imbibition measurement apparatus based on electromotive force.The confined pressure value in step (3), the rock core without Free water state applied is equal with the confined pressure value in step (7), the rock core of saturation applied.
As in figure 2 it is shown, the spontaneous imbibition measurement apparatus based on electromotive force that above-mentioned measuring method uses, control system including enclosing pressure control system, electromotive force monitoring system and pressure reduction.
Enclose pressure control system and include 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.Rock core can be applied confined pressure by hydraulic oil.After opening confined pressure valve, regulating confined pressure pump, and inject hydraulic oil in rubber tube, rubber tube ensures core column face seal while rock core is applied confined pressure.
Electromotive force monitoring system includes constant voltage source 9, netted anelectrode 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 anelectrode 10 and netted negative electrode 11 by wire, netted anelectrode 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 anelectrode 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 cylindrical naked body parcel of known resistivity.
Pressure reduction controls system and includes Pressure gauge 19, water space 8, communicating pipe 20, pond 21, communicating valve 22, hand pump 23, atmospheric valve 24.The volume in pond is sufficiently large, and pond by connecting composition linker communicating pipe with the water space of frame lower.The force value of Pressure gauge display rock core bottom.Pressure gauge 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 hand pump 23 is connected with pond 21 by communicating valve 22, and atmospheric valve 24 is arranged at the top in pond 21.
As it is shown on figure 3, the quantity of potential measurement sheet 13 is four.Each potential measurement sheet 12 is all connected with a data transmission line 12, and all of data line 12 is all connected with computer.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 4, potential measurement sheet 13 includes measuring probe 15, wire 16, electric potential sensor 17, zero line 18, data line 12.Measuring probe 15 is connected with one end of electric potential sensor 17 by wire 16, 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 probe 15 is uniformly distributed on potential measurement sheet 13 along the length direction of potential measurement sheet 13.
As it is shown in figure 5, netted anelectrode 10 and netted negative electrode 11 have the network structure of densification.
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 and constitutes zero gesture line, each electric potential sensor two ends is connected with measuring probe and zero line respectively by wire, the electric potential difference data that electric potential sensor senses are exported to computer by data line, and store in real time on computers.
It is measured as example with RZI-ZS sandstone Absorb Water, fluid is normal saline solution, it is being 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 apparatus and measuring method.
According to Handy (1960) model, the Absorb Water speed of rock core in unit are can be solved:
In formula, m Absorb Water quality, g；
The area of the s self-priming water surface, cm2；
The t Absorb Water time, s；
α Absorb Water speed g/ (cm2·s0.5)。
Data obtain the Absorb Water quality subduplicate situation of change in time of rock core, as shown in Figure 8 after processing.As shown in Figure 8, above-mentioned data straightway matching is good, and it is (70,1.2) that this rock core imbibition rule meets the straight line extending line intersection point of Handy model, spontaneous imbibition section and diffuser, therefore computational analysis obtains Absorb Water speed α=3.9199 × 10 further-4g/(cm2·s0.5), the wetting phase saturation 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 irreducible saturation of non-wetted phase is 5.7%.
Embodiment two:
A kind of spontaneous imbibition measurement apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, as shown in Figure 6, the quantity of potential measurement sheet is 12, and each potential measurement sheet is all connected with a data transmission line, and all of data line is all connected with computer.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 apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, the quantity of potential measurement sheet is 16, each potential measurement sheet is all connected with a data transmission line, and all of data line is all connected with computer.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 apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, the quantity of potential measurement sheet is 20, each potential measurement sheet is all connected with a data transmission line, and all of data line is all connected with computer.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 apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, the quantity of potential measurement sheet is four, each potential measurement sheet is all connected with a data transmission line, all of data line pools a total data line, then is connected with computer.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 apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, the quantity of potential measurement sheet is 12, each potential measurement sheet is all connected with a data transmission line, all of data line pools a total data line, then is connected with computer.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 apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, the quantity of potential measurement sheet is 16, each potential measurement sheet is all connected with a data transmission line, all of data line pools a total data line, then is connected with computer.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 apparatus based on electromotive force and measuring method, essentially identical with embodiment one, the difference is that, the quantity of potential measurement sheet is 20, each potential measurement sheet is all connected with a data transmission line, all of data line pools a total data line, then is connected with computer.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, the spontaneous imbibition measuring method based on electromotive force of the present invention includes the combination in any of each several part shown by the summary of the invention of the invention described above description and detailed description of the invention part and accompanying drawing, as space is limited and for making description concisely describe one by one without by each scheme that these combinations are constituted.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (13)
1., based on a spontaneous imbibition measuring method for electromotive force, comprise the following steps:
Debugging measurement apparatus, and the air-tightness of check measurement device；
Rock core is dried extremely without Free water state, and is placed in rubber tube；
Open confined pressure valve, regulate confined pressure pump, after the confined pressure of rock core is risen to certain value, close confined pressure valve；
Open constant voltage source, record the electric potential difference between each adjacent measuring probe, and by measurement data by data line output to computer；
Open atmospheric valve and communicating valve, regulate hand pump, make the water surface in water space just contact rock core bottom, now start to record the electromotive force of each measuring probe over time；
Time to be batched opens confined pressure valve after reaching measurement requirement, regulates confined pressure pump, the confined pressure of unloading rock core, is positioned in pond to saturation, and is positioned in rubber tube by the rock core of saturation after removal of core；
Open confined pressure valve, regulate confined pressure pump, after the confined pressure of rock core is risen to certain value, close confined pressure valve；
Open constant voltage source, record the electric potential difference between each adjacent measuring probe, and by measurement data by data line output to computer；
The data of computer recording are analyzed, solve each parameter, evaluate the spontaneous imbibition rule of rock core；
It is characterized in that: described measurement apparatus is a kind of spontaneous imbibition measurement apparatus based on electromotive force.
2. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 1, it is characterised in that: the described spontaneous imbibition measurement apparatus based on electromotive force includes enclosing pressure control system, electromotive force monitoring system, pressure reduction control system.
3. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 2, it is characterised in that: described in enclose pressure control system and include frame, rubber tube, rock core, confined pressure valve, confined pressure pump, hydraulic oil.
4. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 3, it is characterised in that: the top of described frame is cylinder, and bottom is water space.
5. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 4, 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, it is filled with hydraulic oil in described rubber tube.
6. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 2, it is characterised in that: described electromotive force monitoring system includes constant voltage source, netted anelectrode, netted negative electrode, data line, potential measurement sheet, fixed value resistance sheet；Described constant voltage source is connected with netted anelectrode and netted negative electrode by wire, described netted anelectrode 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 anelectrode and rock core top, and described potential measurement sheet is connected with described data line；Described potential measurement sheet includes measuring probe.
7. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 6, it is characterised in that: the quantity of described potential measurement sheet is at least four.
8. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 7, it is characterised in that: the quantity of described potential measurement sheet is 12.
9. as claimed in claim 7 or 8 based on the spontaneous imbibition measuring method of electromotive force, it is characterised in that: described potential measurement sheet is uniformly distributed on the inwall of rubber tube along the circumference of described rubber tube.
10. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 6, it is characterised in that: described fixed value resistance sheet is cylindrical, the equal diameters of its diameter and described rock core.
11. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 6, it is characterised in that: described potential measurement sheet also includes wire, electric potential sensor, zero line；Described measuring probe is connected with one end of described electric potential sensor by wire, 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.
12. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 6, it is characterised in that: described measuring probe is uniformly distributed on potential measurement sheet along the length direction of potential measurement sheet.
13. the spontaneous imbibition measuring method based on electromotive force as claimed in claim 2, it is characterised in that: described pressure reduction controls system and includes Pressure gauge, water space, communicating pipe, pond, communicating valve, hand pump, atmospheric valve；Described Pressure gauge is connected with described water space, and it is positioned on same level line with described rock core bottom, described pond is by being connected with water space described communicating pipe, and described hand pump is connected with pond by described communicating valve, and described atmospheric valve is arranged at the top in pond.
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