CN210775151U - Spontaneous imbibition experimental device for compact sensitive reservoir - Google Patents
Spontaneous imbibition experimental device for compact sensitive reservoir Download PDFInfo
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Abstract
The utility model relates to a reservoir imbibition experiment technical field is a spontaneous imbibition experimental apparatus of fine and close sensibility reservoir, and it includes rock core holder, fluid input device, fluid output device and confined pressure pump, and the rock core holder is including controlling the rigidity barrel of intercommunication, and both ends difference fixed mounting has left end lid and right-hand member lid about the rigidity barrel, and the rubber inner tube is installed to coaxial spacing interval in the rigidity barrel. The pore pressure and confining pressure are applied to the rock core sample to be detected, different stratum conditions where the rock is located are simulated, an experimenter can monitor the first pressure value and the second pressure value at different moments in real time, determine the pressure difference at different moments, determine the imbibition quality of the rock core sample according to the pressure difference, determine the water-sensitive damage rate of the rock core sample according to the change condition of the pressure difference, realize the simulation of the spontaneous imbibition process of the rock core under different stratum conditions, and improve the imbibition measurement precision of the rock in a compact reservoir.
Description
Technical Field
The utility model relates to a reservoir imbibition experiment technical field is a spontaneous imbibition experimental apparatus of fine and close sensibility reservoir.
Background
Due to the increase of the world demand for oil and gas resources and the progress of exploitation technology, the development of unconventional oil and gas becomes one of the hot areas of domestic and foreign research. The compact sensitive reservoir has the characteristics of extremely small pore permeability parameter and low water saturation, so that the capillary force effect is obvious and the spontaneous imbibition phenomenon is serious. Meanwhile, due to the high clay content, the clay is easy to expand, disperse and migrate in the seepage and absorption process of the fracturing fluid, and serious water-sensitive damage is caused. According to statistics, the yield reduction of the compact sensitive gas reservoir caused by reservoir damage can reach 70%. Therefore, the research on the imbibition process of the compact sensitive reservoir and the water-sensitive damage caused in the imbibition process has important significance for researching the degree of clay expansion in the imbibition process, further reducing the reservoir damage and improving the yield of the gas well.
In the prior art, a volume method can be adopted to test spontaneous imbibition of the compact rock core, and comprises a cocurrent imbibition volume method and a reverse imbibition volume method. The main principle of the equidirectional imbibition volume method experiment is that a capillary tube with scales is connected with a container filled with a rock core, and the imbibition amount of the rock core is measured by observing the liquid level change in the capillary tube before and after imbibition. The reverse imbibition volume method experiment is to completely immerse the rock core in liquid, the non-wetting phase in the rock core is displaced by the wetting phase due to the imbibition effect, and the non-wetting phase is gathered in a thin tube at the top of the container under the action of gravity, and the imbibition recovery ratio is obtained by measuring the volume of the liquid or gas at the top of the container. Both experimental methods are simple to operate and are mainly suitable for high-porosity and high-permeability rock samples, but for low-porosity, low-permeability or compact rock samples, the seepage amount is small and the seepage time is long due to the small pore throat of the rock, and the evaporation and component change of wetting liquid caused by the change of external temperature and humidity can affect the accuracy of experimental results to a certain extent. At the same time, the above method is limited by the scale, and the determination of the imbibition rate is affected. In addition, the method can only measure under normal pressure, the difference with the condition of a compact reservoir is large, and the reference value of the measurement result is not large.
In the prior art, the spontaneous imbibition of the compact core can also be tested by adopting a weighing method. The main principle of the weighing method experiment is moment of arm and lever principle, one end of the connecting rod is connected with a container with a rock core, and the other end is a weight with known mass which is placed on an electronic balance. Contacting one end face of the rock core with wetting liquid (co-directional imbibition), or completely immersing the rock core in the liquid (reverse imbibition is mainly used), recording the reading of an electronic balance at regular intervals until the mass is not increased any more, and calculating the percentage Et of the amount of the wetting liquid absorbed at the moment in the total pore volume according to a formula I:
et △ m/(V × k) × 100% formula one
Wherein, the wetting liquid amount absorbed by Et at different times accounts for the percentage of the total pore volume, △ m-absorption mass, g, V-core volume, cm3, and k-porosity, percent.
However, when the imbibition process of the tight sandstone core is tested by using the weighing method, the phenomenon of wall hanging often occurs, and the threshold jump effect causes inaccurate imbibition data, and meanwhile, the method can not test and simulate the imbibition effect under the formation pressure, and the reference value of the measurement result is limited.
Therefore, in the existing test experiment, the research on the imbibition effect of the compact reservoir is mostly carried out at normal temperature and normal pressure, and for the compact reservoir with high clay content, the influence of permeability reduction caused by reservoir damage on the imbibition is not considered in the imbibition process.
Disclosure of Invention
The utility model provides a spontaneous imbibition experimental apparatus of fine and close sensitivity reservoir has overcome above-mentioned prior art not enough, and it can effectively solve the problem that the imbibition data degree of accuracy is not high that current intensive sensitivity reservoir imbibition experimentation obtains.
The technical scheme of the utility model is realized through following measure: a spontaneous imbibition experimental device for a compact sensitive reservoir comprises a core holder, a fluid input device, a fluid output device and a confining pressure pump, wherein the core holder comprises a rigid cylinder body which is communicated with the left and the right, a left end cover and a right end cover are fixedly arranged at the left end and the right end of the rigid cylinder body respectively, a rubber inner cylinder is coaxially arranged in the rigid cylinder body at a spacing interval, a clamping cavity is formed between the inner side of the rubber inner cylinder and the inner side of the rigid cylinder body, an annular confining pressure cavity is formed between the outer side of the rubber inner cylinder and the inner side of the rigid cylinder body, the fluid input device is communicated with the left side of the clamping cavity through a first connecting pipe, the fluid output device is communicated with the right side of the clamping cavity through a second connecting pipe; the fluid input device is provided with a first pressure monitoring device, the fluid output device is provided with a second pressure monitoring device, and a third pressure monitoring device is arranged on the third connecting pipe.
The following are further optimization or/and improvement of the technical scheme of the utility model:
a left limiting ring plate extending into the rigid cylinder is fixed at the left end of the rigid cylinder, and a left annular groove with a right opening is formed between the outer side of the left limiting ring plate and the inner side of the left part of the rigid cylinder; a right limiting ring plate extending into the rigid barrel is fixed at the right end of the rigid barrel, and a right annular groove opposite to the left annular groove is formed at the outer side of the right limiting ring plate and the inner side of the right part of the rigid barrel; the left end and the right end of the rubber inner cylinder are respectively inserted into the left annular groove and the right annular groove; the left end cover is fixedly arranged on the inner side of the left limiting ring plate, and the right end cover is fixedly arranged on the inner side of the right limiting ring plate.
The fluid input device comprises a water storage tank, a water pump and an upstream cavity, wherein a left through hole for communicating the clamping cavity with the first connecting pipe is formed in the left end cover; a first pressure monitoring device is disposed at the upstream chamber.
The water inlet pipe is provided with a flowmeter and a first valve.
The fluid output device comprises a downstream cavity, a right through hole which is used for communicating the clamping cavity with the second connecting pipe is formed in the right end cover, the downstream cavity is communicated with the right through hole through the second connecting pipe, the second pressure monitoring device is arranged at the downstream cavity, and a second valve is connected to the third connecting pipe in series.
The rigid cylinder, the left end cover and the right end cover are made of heat conducting materials, and a heater is arranged on the outer side of the rigid cylinder; or/and a thermometer for detecting the temperature in the annular confining pressure cavity is arranged on the outer side of the rigid cylinder.
The temperature sensor further comprises a data acquisition device and a data processing device, the data acquisition device adopts a data acquisition unit, the signal output ends of the first pressure monitoring device, the second pressure monitoring device and the thermometer are electrically connected with the signal input end and the signal output end of the data acquisition device, and the signal output end of the data acquisition device is electrically connected with the signal input end of the data processing device.
The first pressure monitoring device, the second pressure monitoring device and the third pressure monitoring device are respectively a first pressure gauge, a second pressure gauge and a third pressure gauge.
The utility model has the advantages of reasonable and compact structure, convenient to use, it is through treating to detect the rock core sample and exert pore pressure and confined pressure, the different stratum conditions that the simulation rock was located, the experimenter can real-time supervision the first pressure value at different moments with the second pressure value, confirm the pressure differential at different moments, confirm the imbibition quality of rock core sample according to the pressure differential, simultaneously, confirm the water sensitivity damage rate of rock core sample according to the change situation of pressure differential, and realized simulating the spontaneous imbibition process of rock core under different stratum conditions, improved the imbibition measurement accuracy of compact reservoir rock; and obtaining the expansion rule of clay in the rock core according to the attenuation rule of the pressure difference between the upstream and the downstream of the rock core, and judging the size of the water-sensitive damage.
Drawings
Fig. 1 is a schematic connection diagram of the preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of one of the specific connection modes of the preferred embodiment of the present invention.
Fig. 3 is a front view cross-sectional enlarged structural schematic diagram of the core holder.
Fig. 4 is a schematic diagram of a second embodiment of the present invention.
The codes in the figures are respectively: 11 is a fluid input device, 12 is a rock core holder, 13 is a fluid output device, 14 is a confining pressure pump, 15 is a heater, 16 is a thermometer, 17 is a data acquisition device, and 18 is a data processing device;
111 is a first connecting pipe, 112 is a first pressure gauge, 113 is a water storage tank, 114 is a water pump, 115 is an upstream chamber, 116 is a flow meter, 117 is a first valve, and 118 is a water inlet pipe;
121 is a clamping cavity, 122 is a rigid cylinder, 123 is a left end cover, 124 is a right end cover, 125 is a core sample, 126 is a left through hole, 127 is a right through hole, 128 is a rubber inner cylinder, 129 is a left limit ring plate, 1220 is a right limit ring plate, and 1221 is an annular confining pressure cavity;
131 is a second connecting pipe, 132 is a second pressure gauge, and 133 is a downstream chamber;
a third connection pipe 141, a second valve 142, and a third pressure gauge 143.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
Wall hanging phenomenon: the method is frequently used in core imbibition experiments and influences the measurement accuracy. The non-wetting phase is displaced by the wetting phase liquid under the action of the seepage and is adhered to the surface of the rock core under the action of interfacial tension, small liquid beads or bubbles are slowly gathered together along with the increase of the seepage amount, the interfacial tension is gradually overcome by the action of gravity differentiation, and the liquid beads or the bubbles can be separated from the surface of the rock core. In the compact oil imbibition experiment, the low permeability, the small pore throat, the slow imbibition rate and the long duration of the wall-hanging phenomenon cause large errors in the initial measurement of the imbibition amount and the calculation of the imbibition rate by adopting the traditional method, particularly the volume method.
Threshold jump effect: when liquid is contacted with a dry rock sample, the mass is suddenly increased due to the fact that the liquid surface energy and the capillary action generate pulling force on the rock core, and the effect is the threshold jump effect, and the threshold jump effect is particularly obvious in the water-wet rock core imbibition experiment.
The invention will be further described with reference to the following examples and drawings:
as shown in fig. 1 to 4, the spontaneous imbibition experimental device for the tight sensitive reservoir comprises a core holder 12, a fluid input device 11, a fluid output device 13 and a confining pressure pump 14, wherein the core holder 12 comprises a rigid cylinder 122 which is communicated with the left and right, a left end cover 123 and a right end cover 124 are fixedly installed at the left and right ends of the rigid cylinder 122 respectively, a rubber inner cylinder 128 is coaxially installed in the rigid cylinder 122 at a spacing interval, a clamping cavity 121 is formed between the inner side of the rubber inner cylinder 128, the left end cover 123 and the right end cover 124, an annular confining pressure cavity 1221 is formed between the outer side of the rubber inner cylinder 128 and the inner side of the rigid cylinder 122, the fluid input device 11 is communicated with the left side of the clamping cavity 121 through a first connecting pipe 111, the fluid output device 13 is communicated with the right side of the clamping cavity 121 through a second connecting pipe 131, and the output end of the; the fluid inlet means 11 is provided with a first pressure monitoring means, the fluid outlet means 13 is provided with a second pressure monitoring means, and a third pressure monitoring means is provided on the third connection pipe 141.
The device simulates different stratum conditions of the rock by applying pore pressure and confining pressure on the core sample 125 to be detected, experimenters can monitor a first pressure value and a second pressure value at different moments in real time, determine pressure difference at different moments, determine the imbibition quality of the core sample 125 according to the pressure difference, determine the water-sensitive damage rate of the core sample 125 according to the change condition of the pressure difference, realize the simulation of the spontaneous imbibition process of the core under different stratum conditions, and improve the imbibition measurement precision of the rock of a compact reservoir; and obtaining the expansion rule of clay in the rock core according to the attenuation rule of the pressure difference between the upstream and the downstream of the rock core, and judging the size of the water-sensitive damage.
Namely, the device solves the problem of inaccurate imbibition data caused by wall hanging phenomenon and threshold jump effect in the imbibition test process by adopting a weighing method through testing the weak change of upstream and downstream pressure of the core sample 125, and improves the imbibition measurement precision of tight reservoir rock.
It should be noted that in view of the greater fragility and lower imbibition of tight reservoirs, the core sample 125 is protected under sufficient consideration in the experiment to ensure the accuracy of the measurements.
The spontaneous imbibition experimental device for the compact sensitive reservoir can be further optimized or/and improved according to actual needs:
as shown in fig. 3, a left limit ring plate 129 extending into the rigid cylinder 122 is fixed at the left end of the rigid cylinder 122, and a left annular groove with a right opening is formed between the outer side of the left limit ring plate 129 and the inner side of the left part of the rigid cylinder 122; a right limiting ring plate 1220 extending into the rigid cylinder 122 is fixed at the right end of the rigid cylinder 122, and a right annular groove opposite to the left annular groove is formed at the outer side of the right limiting ring plate 1220 and the inner side of the right part of the rigid cylinder 122; the left end and the right end of the rubber inner cylinder 128 are respectively inserted into the left annular groove and the right annular groove; the left end cap 123 is fixedly mounted on the inner side of the left limit ring plate 129, and the right end cap 124 is fixedly mounted on the inner side of the right limit ring plate 1220.
The left end cover 123 is fixedly installed on the inner side of the left limit ring plate 129 through threads, and the right end cover 124 is fixedly installed on the inner side of the right limit ring plate 1220 through threads. When processing, firstly, the rigid cylinder 122 is processed into a two-petal structure, two ends of the rubber inner cylinder 128 are respectively inserted into the left annular groove and the right annular groove, then the two-petal structure is butted and fixed, different fixing modes are selected according to different materials, and when the rigid cylinder 122 is made of metal materials, the rigid cylinder can be welded, welding materials are not convenient, and the rigid cylinder can be bonded and fixed by adhesives.
In practical application, the left limit ring plate 129 and the right limit ring plate 1220 are thin and are in a sheet shape, so that the rubber inner cylinder 128 is not influenced to apply confining pressure to the core sample 125.
As shown in fig. 4, the fluid input device 11 includes a water storage tank 113, a water pump 114 and an upstream chamber 115, a left through hole 126 is provided on the left end cap 123 to communicate the clamping cavity 121 with the first connecting pipe 111, the upstream chamber 115 and the left through hole 126 are communicated through the first connecting pipe 111, a water outlet end of the water pump 114 is communicated with the upstream chamber 115 through a water inlet pipe 118, and the water storage tank 113 is communicated with a water inlet end of the water pump 114 through a pipeline; a first pressure monitoring device is disposed at the upstream chamber 115.
The reservoir 113 contains distilled water or saturated formation water, and the distilled water or saturated formation water in the reservoir 113 is pumped by the water pump 114 through the upstream chamber 115 into the core holder 12.
As shown in fig. 4, a flow meter 116 and a first valve 117 are provided on the inlet pipe 118.
The flow meter 116 may read the flow rate of fluid pumped by the water pump 114 into the upstream chamber 115. When the first pressure value detected by the first pressure monitoring device reaches the preset initial pressure value, the first valve 117 is closed, and the fluid injection is stopped.
As shown in fig. 4, the fluid output device 13 includes a downstream chamber 133, a right through hole 127 communicating the clamping chamber 121 with the second connecting pipe 131 is provided on the right end cover 124, the downstream chamber 133 communicates with the right through hole 127 through the second connecting pipe 131, a second pressure monitoring device is provided at the downstream chamber 133, and a second valve 142 is connected in series to a third connecting pipe 141.
As shown in fig. 4, the rigid cylinder 122, the left end cap 123 and the right end cap 124 are made of heat conducting materials, and the heater 15 is arranged outside the rigid cylinder 122; or/and a thermometer 16 for detecting the temperature in the annular confining pressure cavity 1221 is arranged outside the rigid cylinder 122.
The heat conducting material can be made of the existing known material such as stainless steel. The heater 15 may indirectly heat the core sample 125 and the fluid in the clamping chamber 121, and the experiment temperature is set to normal temperature, and may be set to 50 ℃ to 100 ℃ according to the reservoir conditions.
As shown in fig. 4, the pressure monitoring device further includes a data acquisition device 17 and a data processing device 18, the data acquisition device 17 adopts a data acquisition unit, signal output ends of the first pressure monitoring device, the second pressure monitoring device and the thermometer 16 are electrically connected with a signal input end and a signal output end of the data acquisition device 17, and a signal output end of the data acquisition device 17 is electrically connected with a signal input end of the data processing device 18.
The data processing device 18 may be a computer. The data processing device 18 is configured to determine a pressure difference at each time according to the first pressure value (obtained by the first pressure monitoring device) and the second pressure value (obtained by the second pressure monitoring device) at each time, which are collected by the data collection device 17, and determine a water-sensitive damage rate of the core sample 125 according to a change situation of the pressure difference at each time.
The data acquisition device 17 acquires real-time data of pressure in the experimental process, data processing and analysis are carried out through the data processing device 18, experimental data do not need to be recorded manually, data processing and analysis are carried out after the experiment is finished, and real-time monitoring of the experimental data and an automatic processing process of the experimental data are achieved.
The first pressure monitoring device, the second pressure monitoring device and the third pressure monitoring device are a first pressure gauge 112, a second pressure gauge 132 and a third pressure gauge 143, respectively, as required.
The first pressure gauge 112 is configured to detect a first pressure value of the fluid pumped by the fluid input device 11 into the clamping chamber 121 of the core holder 12.
The second pressure gauge 132 is configured to measure a second pressure value of the fluid after flowing through the clamping chamber 121 of the core holder 12.
The third pressure gauge 143 is used for detecting the confining pressure value injected into the annular confining pressure cavity 1221.
The utility model discloses a use method: the first step is as follows: selecting a core sample 125, drilling a cylindrical sample with the diameter same as the inner diameter of a clamping cavity 121 of the core holder 12, and grinding the section to be flat;
the second step is that: loading the core sample 125 into the holding cavity 121 of the core holder 12 from the left side or the right side, and then screwing the left end cover 123 and the right end cover 124;
the third step: according to the length of the core sample 125, a proper confining pressure is injected into the annular confining pressure cavity 1221 through the third connecting pipe 141 by the confining pressure pump 14, the second valve 142 is closed, and the rubber inner cylinder 128 deforms into the clamping cavity 121 under the confining pressure effect, so that the purpose of applying the confining pressure to the core sample 125 in the clamping cavity 121 is achieved; selecting a proper flow rate to pump fluid by the water pump 114 to make the pressure (P1, i.e. the first pressure measured by the first pressure gauge 112, also referred to as displacement pressure) upstream of the core sample 125 reach a preset initial pressure, and closing the first valve 117;
it should be noted that the confining pressure was maintained at a pressure greater than the upstream pressure throughout the experiment to ensure that the core holder 12 was not damaged.
The fourth step: collecting a first pressure value (P1) of the first pressure gauge 112 and a second pressure value (P2) of the second pressure gauge 132 at different moments, and determining pressure differences at different moments;
the fifth step: and determining the imbibition mass of the core sample 125 at different times according to the pressure difference.
And a sixth step: and determining the damage degree of the rock core in the imbibition process according to the time for reducing the pressure difference by 0.1 Mpa.
The experimental principle is as follows:
and researching the relationship between the imbibition mass of the rock core and time by adopting Darcy's law. When water passes through the core, the flow rate of the water is in direct proportion to the sectional area of the core and the pressure difference at the inlet and the outlet, and in inverse proportion to the length of the core. When different fluids are used, the flow rate is inversely proportional to the viscosity of the fluid, and the Darcy formula is shown in formula II:
wherein Q-the flow through the core under differential pressure, cm 3/s; core cross-sectional area, cm 2; -core length, cm; -fluid viscosity through the core, mpa.s; -pressure difference before and after fluid passing through the core, 10-1 MPa; k-permeability of core pore medium.
Before the experiment, the permeability and the fluid viscosity of the rock core are tested, the pressure difference is obtained by reading the pressure values of the first pressure gauge 112 and the second pressure gauge 132, and the formula two is processed to obtain the formula three:
wherein, P1-first pressure value (upstream pressure); p2 — second pressure value (downstream pressure); rho-fluid density, t-imbibition time.
And obtaining the imbibition quality of the rock core at different time through the pressure difference between the upstream and the downstream of the rock core.
Darcy's law has certain applicable conditions: when the seepage velocity is increased to a certain value, in addition to the viscous resistance, the large inertia resistance is generated. At the moment, the flow rate and the pressure difference are not in a linear relation any more, the seepage velocity value is the critical seepage velocity of the Darcy law, when the subcritical seepage velocity is exceeded, the flow is converted from linear seepage into nonlinear seepage, the Darcy formula is not applicable any more, and the formula of the critical seepage velocity is referred to as formula IV:
wherein, Rec-critical Reynolds number; μ -viscosity of the fluid, mPas; phi-porosity; ρ -density of fluid, g/cm 3; k-permeability, D.
According to experience, the critical Reynolds number of a general reservoir is 0.2-0.3, the permeability of a compact reservoir is generally 0.01mD, and the critical seepage velocity of the compact sensitive reservoir obtained by substituting the permeability into the formula IV is 30 cm/s. In practical experiments, the outlet liquid flow of the outlet end of the flow meter is small in the displacement process of the compact sensitive reservoir core for 10 hours under the pressure difference of 3Mpa, and the seepage speed is far less than 30cm/s, so that the Darcy's law is applicable to compact sensitive reservoirs.
The clay content of the compact sensitive reservoir is high, so that the expansion, dispersion and migration of the clay in the reservoir are easily caused after the fluid with low mineralization enters the reservoir, the permeability is reduced, and the imbibition amount of the core is reduced. Therefore, it is difficult to evaluate sensitive injuries using conventional hydrometric permeability methods. The decrease of permeability also enables the attenuation of the upstream pressure of the rock core to be slower, the pressure attenuation method is used for evaluating the water-sensitive damage by researching the attenuation rate of the upstream pressure of the rock core in the same time period, and the method is well verified in the practical application of a compact reservoir.
Specifically, the experimenter determines the pressure difference at different moments according to the first pressure value and the second pressure value at different moments, and records the change situation of the pressure difference along with time. The pressure difference generally decreases slowly with time, and the decay of the pressure difference reflects the change of the permeability of the core and the change of the imbibition mass of the core. The calculation formula of the water-sensitive damage rate is shown in the formula V:
IK ═ (△ T1- △ T2)/△ T2 × 100% formula five
Wherein, the IK-water sensitive damage rate, the time taken for △ T1-pressure difference to decrease by 0.1MPa, and the time taken for △ T2-pressure difference to decrease by 0.1MPa, Table 1 shows the corresponding relationship between the water sensitive damage rate and the damage degree, as shown in Table 1, the greater the water sensitive damage rate, the stronger the damage degree, the greater the expansion rate of clay in the core sample 125, and the faster the decrease of permeability.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
TABLE 1
| Water-sensitive damage rate% | Degree of damage |
| IK≤5 | Is free of |
| 5<IK≤30 | Weak (weak) |
| 30<IK≤50 | Moderate and weak |
| 50<IK≤70 | Moderate bias strength |
| 70<IK≤90 | High strength |
| IK>90 | Extremely strong |
Claims (10)
1. A spontaneous imbibition experimental device for a compact sensitive reservoir is characterized by comprising a core holder, a fluid input device, a fluid output device and a confining pressure pump, wherein the core holder comprises a rigid cylinder body which is communicated from left to right, a left end cover and a right end cover are fixedly arranged at the left end and the right end of the rigid cylinder body respectively, a rubber inner cylinder is coaxially arranged in the rigid cylinder body at a spacing interval, a clamping cavity is formed between the inner side of the rubber inner cylinder, the left end cover and the right end cover, an annular confining pressure cavity is formed between the outer side of the rubber inner cylinder and the inner side of the rigid cylinder body, the fluid input device is communicated with the left side of the clamping cavity through a first connecting pipe, the fluid output device is communicated with the right side of the clamping cavity through a second connecting pipe; the fluid input device is provided with a first pressure monitoring device, the fluid output device is provided with a second pressure monitoring device, and a third pressure monitoring device is arranged on the third connecting pipe.
2. The spontaneous imbibition experimental device for the tight sensitive reservoir as claimed in claim 1, wherein a left limiting ring plate extending into the rigid cylinder is fixed at the left end of the rigid cylinder, and a left annular groove with a right opening is formed between the outer side of the left limiting ring plate and the inner side of the left part of the rigid cylinder; a right limiting ring plate extending into the rigid barrel is fixed at the right end of the rigid barrel, and a right annular groove opposite to the left annular groove is formed at the outer side of the right limiting ring plate and the inner side of the right part of the rigid barrel; the left end and the right end of the rubber inner cylinder are respectively inserted into the left annular groove and the right annular groove; the left end cover is fixedly arranged on the inner side of the left limiting ring plate, and the right end cover is fixedly arranged on the inner side of the right limiting ring plate.
3. The spontaneous imbibition experimental device for the tight sensitive reservoir as claimed in claim 1 or 2, wherein the fluid input device comprises a water storage tank, a water pump and an upstream chamber, a left through hole for communicating the clamping cavity with the first connecting pipe is arranged on the left end cover, the upstream chamber is communicated with the left through hole through the first connecting pipe, a water outlet end of the water pump is communicated with the upstream chamber through a water inlet pipe, and the water storage tank is communicated with a water inlet end of the water pump through a pipeline; a first pressure monitoring device is disposed at the upstream chamber.
4. The spontaneous imbibition experimental device for tight sensitive reservoir as claimed in claim 3, wherein the water inlet pipe is provided with a flow meter and a first valve.
5. The spontaneous imbibition experimental device for tight sensitive reservoir as claimed in claim 1, 2 or 4, wherein the fluid output device includes a downstream chamber, a right through hole for communicating the clamping cavity with the second connecting pipe is arranged on the right end cover, the downstream chamber is communicated with the right through hole through the second connecting pipe, the second pressure monitoring device is arranged at the downstream chamber, and a second valve is connected in series with the third connecting pipe.
6. The spontaneous imbibition experimental device for the tight sensitive reservoir as claimed in claim 1, 2 or 4, wherein the rigid cylinder, the left end cover and the right end cover are made of heat conducting materials, and a heater is arranged outside the rigid cylinder; or/and a thermometer for detecting the temperature in the annular confining pressure cavity is arranged on the outer side of the rigid cylinder.
7. The spontaneous imbibition experimental device for the tight sensitive reservoir as claimed in claim 3, wherein the rigid cylinder, the left end cover and the right end cover are made of heat conducting materials, and a heater is arranged outside the rigid cylinder; a thermometer for detecting the temperature in the annular confining pressure cavity is arranged on the outer side of the rigid cylinder body.
8. The spontaneous imbibition experimental device for the tight sensitive reservoir as claimed in claim 5, wherein the rigid cylinder, the left end cover and the right end cover are made of heat conducting materials, and a heater is arranged outside the rigid cylinder; a thermometer for detecting the temperature in the annular confining pressure cavity is arranged on the outer side of the rigid cylinder body.
9. The spontaneous imbibition experimental device for the tight sensitive reservoir as claimed in claim 8, further comprising a data acquisition device and a data processing device, wherein the data acquisition device adopts a data acquisition unit, signal output ends of the first pressure monitoring device, the second pressure monitoring device and the thermometer are electrically connected with a signal input end and a signal output end of the data acquisition device, and a signal input end of the data processing device is electrically connected with a signal output end of the data acquisition device.
10. The spontaneous imbibition experimental device for tight sensitive reservoir as claimed in claim 1, 2, 4, 7, 8 or 9, wherein the first pressure monitoring device, the second pressure monitoring device and the third pressure monitoring device are respectively a first pressure gauge, a second pressure gauge and a third pressure gauge.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112771A (en) * | 2020-08-25 | 2022-03-01 | 中国石油天然气股份有限公司 | Rock core imbibition quality analysis method and device for oil and gas reservoir |
| CN115078222A (en) * | 2022-07-07 | 2022-09-20 | 西安石油大学 | Imbibition physical simulation experiment device and method considering seam end pressure difference |
| CN115420464A (en) * | 2022-11-07 | 2022-12-02 | 西南交通大学 | Underground engineering fluid pressure simulation system, method and related equipment |
-
2019
- 2019-08-27 CN CN201921403291.3U patent/CN210775151U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112771A (en) * | 2020-08-25 | 2022-03-01 | 中国石油天然气股份有限公司 | Rock core imbibition quality analysis method and device for oil and gas reservoir |
| CN114112771B (en) * | 2020-08-25 | 2023-09-26 | 中国石油天然气股份有限公司 | Core imbibition quality analysis method and device for oil and gas reservoir |
| CN115078222A (en) * | 2022-07-07 | 2022-09-20 | 西安石油大学 | Imbibition physical simulation experiment device and method considering seam end pressure difference |
| CN115078222B (en) * | 2022-07-07 | 2023-10-27 | 西安石油大学 | Seepage physical simulation experiment device and method considering slit end pressure difference |
| CN115420464A (en) * | 2022-11-07 | 2022-12-02 | 西南交通大学 | Underground engineering fluid pressure simulation system, method and related equipment |
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