CN110231258B - Experimental device and method for testing shale reservoir osmotic pressure - Google Patents

Experimental device and method for testing shale reservoir osmotic pressure Download PDF

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Publication number
CN110231258B
CN110231258B CN201910311844.0A CN201910311844A CN110231258B CN 110231258 B CN110231258 B CN 110231258B CN 201910311844 A CN201910311844 A CN 201910311844A CN 110231258 B CN110231258 B CN 110231258B
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experimental
osmotic pressure
sensor
shale reservoir
chamber
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CN110231258A (en
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姚二冬
曹冲
周福建
李源
钟岳宸
张东航
杨凯
赵续荣
刘爽
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China University of Petroleum Beijing CUPB
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China University of Petroleum Beijing CUPB
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/04Investigating osmotic effects

Abstract

The invention discloses an experimental device and a method for testing the osmotic pressure of a shale reservoir, wherein the device comprises: the device comprises a hollow cylinder body, wherein a semipermeable membrane for simulating the imbibition between a shale reservoir and fracturing fluid is arranged in the cylinder body; the semi-permeable membrane divides the hollow cylinder into a first chamber and a second chamber which are opposite; the semi-permeable membrane has a molecular weight cut-off of between 50 and 2000; a fastener for securing the semi-permeable membrane; a sensor for testing a predetermined parameter in the first and second chambers; and the data acquisition system is electrically connected with the sensor and is used for storing the experimental value corresponding to the preset parameter tested by the sensor. The method can quickly and accurately obtain the osmotic pressure of the shale reservoir in the process of fracturing fluid imbibition so as to further research the imbibition mechanism between the shale reservoir and the fracturing fluid.

Description

Experimental device and method for testing shale reservoir osmotic pressure
Technical Field
The invention relates to an experimental device for imbibition and displacement between fracturing fluid and shale in the fracturing modification process of an unconventional reservoir, in particular to an experimental device and method for testing the osmotic pressure of a shale reservoir.
Background
Shale gas is a typical unconventional oil and gas resource, and the most remarkable characteristics are low porosity, low permeability and difficult exploitation, and economic exploitation can be realized only by large-scale volume fracturing reformation. In the volume fracturing modification process, the imbibition and displacement action between the fracturing fluid and the shale reservoir becomes a hotspot problem and a technical problem in the shale reservoir fracturing yield-increasing modification mechanism research process in recent years.
Research results of a plurality of students in recent years show that the chemical osmotic pressure imbibition effect is one of shale reservoir fracturing fluid imbibition and displacement effect mechanisms, and plays a key role in researching the shale reservoir fracturing modification yield increase effect mechanism. In particular, shale has the property of a semi-permeable membrane, i.e. allowing only water molecules to pass through, but not salt ions or a part of salt ions. The characteristics of the semi-permeable membrane are key factors causing the existence of chemical osmotic pressure, and the permeability characteristics and the microscopic mechanism of the fracturing fluid of the shale reservoir are analyzed based on the theory that capillary force and chemical osmotic pressure induce permeability, so that the shale hydraulic fracturing yield-increasing transformation mechanism can be further researched, and the field fracturing construction design can be guided.
At present, the research on the osmotic effect of chemical osmotic pressure mainly focuses on the theoretical calculation of osmotic pressure, and the research on the experimental test device of osmotic pressure is less. Experiment tests are mostly carried out at home and abroad by adopting a simple inverted long-neck funnel or U-shaped tube mode. During specific operation, experimental test is carried out on osmotic pressure through the liquid level rising height at one side of the funnel conduit or the U-shaped pipe.
The method can only roughly measure the osmotic pressure to a certain extent. Osmotic pressure is affected by the degree of mineralization, and as the degree of mineralization increases, the chemical potential difference of the solution across the semi-permeable membrane increases. In order to achieve a balance of chemical potentials on both sides of the membrane interface, the amount of external water entering the core is increased, thereby increasing the energy inside the core.
Generally, the mineralization fluctuation range is relatively large. For a scene with a large mineralization degree fluctuation range of the fracturing fluid, the measurement range and the precision are limited, so that an osmotic pressure test result is often inaccurate. For example, under the condition that the mineralization degree is as high as 1000mg/L, the length of the conduit can meet the requirement only when the length of the conduit reaches more than 100 meters, and obviously, the measuring range of the existing conduit can not meet the requirement of osmotic pressure test; in addition, under the condition that the mineralization degree is less than 1mg/L, the liquid level height of the conduit does not change obviously, and the precision of the existing conduit cannot meet the test requirement.
Therefore, a simple, accurate and efficient osmotic pressure testing device needs to be researched, and an effective testing means is provided for researching the seepage and absorption action mechanism of the fracturing fluid.
Disclosure of Invention
The invention aims to provide an experimental device and method for testing the osmotic pressure of a shale reservoir, which can quickly and accurately obtain the osmotic pressure of the shale reservoir in the process of fracturing fluid imbibition so as to further research the imbibition mechanism between the shale reservoir and the fracturing fluid.
The embodiment of the application discloses experimental apparatus of test shale reservoir bed osmotic pressure, the device includes:
the device comprises a hollow cylinder body, wherein a semipermeable membrane for simulating the imbibition between a shale reservoir and fracturing fluid is arranged in the cylinder body; the semi-permeable membrane divides the hollow cylinder into a first chamber and a second chamber which are opposite; the semi-permeable membrane has a molecular weight cut-off of between 50 and 2000;
a fastener for securing the semi-permeable membrane;
a sensor for testing a predetermined parameter in the first and second chambers;
and the data acquisition system is electrically connected with the sensor and is used for storing the experimental value corresponding to the preset parameter tested by the sensor.
In a preferred embodiment, the inner wall of the cylinder is provided with a first matching part, the fastener is provided with a second matching part matched with the first matching part, and the first matching part and the second matching part are matched to form a sliding mechanism which can enable the fastener to axially slide relative to the cylinder.
In a preferred embodiment, the cylinder is made of transparent acrylic tubes, and can resist 2 MPa of pressure and 100 ℃ of temperature.
In a preferred embodiment, a first stirring member is disposed within the first chamber and a second stirring member is disposed within the second chamber.
In a preferred embodiment, the first stirring member or the second stirring member is a magnetic rotor having heating and magnetic stirring functions.
In a preferred embodiment, the sensor comprises any one or combination of the following: pressure sensor, temperature sensor, conductivity sensor, experimental apparatus still includes: the process control integration is electrically connected with the sensor, the data acquisition system, the first stirring piece and the second stirring piece.
A method of the experimental device for testing the shale reservoir permeability pressure comprises the following steps:
injecting a predetermined amount of distilled water into the first chamber and injecting a predetermined amount of fracturing fluid into the second chamber;
opening a data acquisition system, and receiving an experimental variation value of a preset parameter obtained by a sensor; the experimental variation value comprises a variation value of pressure in the first chamber and the second chamber;
and determining the osmotic pressure change in the shale reservoir fracturing imbibition replacement process according to the experimental change value.
In a preferred embodiment, the method further comprises: determining a semi-permeable membrane for simulating fracturing seepage and suction of the shale reservoir according to the condition parameters of the shale reservoir; the condition parameters include: temperature, degree of mineralization, pH, reservoir permeability.
In a preferred embodiment, the method further comprises: and changing the position of the semipermeable membrane, and repeating the experimental steps to determine the influence of different core lengths and different amounts of the fracturing fluid on the osmotic pressure.
In a preferred embodiment, in the step of determining the osmotic pressure change in the shale reservoir fracturing imbibition displacement process according to the experimental change value, the osmotic pressure between the semipermeable membrane and the fracturing fluid can be determined; the method further comprises the following steps:
replacing distilled water in the first chamber with a core, and sliding the fastener to be close to the end face of the core;
receiving an experimental variation value of the pressure obtained by the sensor; acquiring the osmotic pressure between the rock core and the fracturing fluid according to the pressure experiment change value;
and comparing the osmotic pressure between the semi-permeable membrane and the fracturing fluid with the osmotic pressure between the rock core and the fracturing fluid.
The invention has the characteristics and advantages that: according to the experimental device and the method for testing the osmotic pressure of the shale reservoir provided by the embodiment of the application, the existing semipermeable membrane can be used for simulating the characteristic of the semipermeable membrane of the shale reservoir, and the osmotic pressure of the shale reservoir can be simulated; and the osmotic pressure of the real shale core can be directly tested. Furthermore, the advantage of this device can be utilized, the difference under two kinds of condition can be analyzed to the effect of the real shale core of the simulation of evaluation pellicle.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Fig. 1 is a schematic structural diagram of an experimental apparatus for testing shale reservoir osmotic pressure provided in an embodiment of the present application;
FIG. 2 is a flow chart illustrating steps of an experimental method for testing shale reservoir permeability provided in an embodiment of the present application;
fig. 3 is a graph of osmotic pressure as a function of osmotic time.
Description of reference numerals:
1. a first sensor; 2. a second sensor; 3. a third sensor; 4. a fourth sensor; 5. a first stirring member; 6. a fastener; 7. a second stirring member; 8. a first display instrument; 9. a second display instrument; 10. a third display instrument; 11. a fourth display instrument; 12. integrating process control; 13. a data acquisition system; 14. a barrel; 141. a first chamber; 142. a second chamber; 15. a semi-permeable membrane.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention provides an experimental device and method for testing the osmotic pressure of a shale reservoir, which can quickly and accurately obtain the osmotic pressure of the shale reservoir in the process of fracturing fluid imbibition so as to further research the imbibition mechanism between the shale reservoir and the fracturing fluid.
As shown in fig. 1, the experimental apparatus for testing the shale reservoir osmotic pressure provided in the embodiment of the present disclosure mainly includes: the device comprises a hollow cylinder body 14, wherein a semi-permeable membrane 15 for simulating the seepage action between a shale reservoir and fracturing fluid is arranged in the cylinder body 14; the semi-permeable membrane 15 divides the hollow cylinder 14 into a first chamber 141 and a second chamber 142 opposite each other; a fastener 6 for fixing the semipermeable membrane 15; sensors for testing predetermined parameters in the first and second chambers 141 and 142; and the data acquisition system 13 is electrically connected with the sensor and is used for storing the experimental value corresponding to the preset parameter tested by the sensor.
In this embodiment, the barrel 14 may be used for placing rock cores, containing fracturing fluid, distilled water and other solutions according to the experiment requirement. In general, the barrel 14 is a closed hollow cylinder. Specifically, the cylinder 14 can be made of a transparent acrylic tube, and can resist 2 mpa and 100 ℃. When this barrel 14 adopts transparent material, the experimental condition in the barrel 14 is observed from the outside to the convenience, can observe the infiltration phenomenon in the experimentation more directly perceivedly.
In this embodiment, the semi-permeable membrane 15 is used to simulate imbibition between the shale reservoir and the fracturing fluid. In particular, the semi-permeable membrane 15 may include a surface dense layer and a support layer. Wherein, the surface compact layer is a working layer which is used for desalting and is formed by filling a supporting layer with casting film liquid. The casting solution can be divided into a high polymer material and a low molecular material. The support layer has a porous structure, is capable of supporting the entire semi-permeable membrane 15, and facilitates the passage of water.
The semi-permeable membrane 15 can select the semi-permeable membrane 15 with the molecular weight cut-off within the range of 50-2000 according to the condition parameters of the shale reservoir, so that the shale reservoir can be effectively simulated. Wherein the condition parameters of the shale reservoir may include: temperature, degree of mineralization, pH, reservoir permeability and the like.
In this embodiment, the fastener 6 is used to fix the semipermeable membrane 15. In particular, the fastener 6 may be arranged in the cylinder 14 in a position-adjustable manner in the cylinder 14. When the position of the fastener 6 can be adjusted along the axial direction of the cylinder 14, different core length simulation requirements can be met during experiments. For a particular experiment, the first chamber 141 may be used to hold a core or distilled water. The length of the first chamber 141 may be determined according to the actual core. When the desired simulated core length is known, i.e., the axial length of the first chamber 141 is determined, the position of the fastener 6 can be adjusted to match the desired simulated core length.
In one embodiment, a first stirring element 5 is disposed within the first chamber 141 and a second stirring element 7 is disposed within the second chamber 142. The first stirring member 5 is used for stirring the solution in the first chamber 141, so that ions of the solution in the first chamber 141 are uniformly diffused, and the accuracy of an experimental result is ensured. Correspondingly, the second stirring part 7 is used for stirring the solution in the second chamber 142, so that the ion diffusion of the solution in the second chamber 142 is uniform, and the accuracy of the experimental structure is further ensured.
Specifically, the first stirring member 5 or the second stirring member 7 may be a magnetic rotor having heating and magnetic stirring functions. The magnetic rotor can be used in cooperation with an electric heating constant-temperature water bath kettle, and can realize the heating and stirring functions at the same time. When the magnetic rotor has the heating and stirring functions, ions of the solution in the cavity can be rapidly diffused, so that the efficiency and the precision of an experiment are improved.
The inner wall of the cylinder 14 is provided with a first matching part, the fastener 6 is provided with a second matching part matched with the first matching part, and the first matching part and the second matching part are matched to form a sliding mechanism which can enable the fastener 6 to axially slide relative to the cylinder 14. Specifically, the first engaging portion may be in the form of a sliding slot, which may extend lengthwise along the axial direction of the barrel 14. The second matching part can be a clamping part clamped into the sliding groove. Of course, the first matching portion and the second matching portion can be matched to form a sliding mechanism in other matching forms, and the application is not limited in detail here. Overall, the slidable fastener 6 to vary the volume of the different chamber solutions can be used to analyze the effect of fracturing fluid usage on imbibition laws.
The cylinder 14 is further provided with a sensor for testing a predetermined parameter in the first and second chambers 141 and 142. The sensor may comprise any one or a combination of the following: pressure sensor, temperature sensor, conductivity sensor. The specific form of the sensor can be selected and combined according to the experimental needs, and the specific application is not limited herein. For example, four sensor interfaces can be provided on the cartridge 14, in which sensors of corresponding functions are installed according to the simulation requirements of experimental parameters.
When the number of the interfaces of the sensor is four, and each interface is provided with a sensor with a corresponding function, the four sensors on the cylinder 14 can be the first sensor 1, the second sensor 2, the third sensor 3 and the fourth sensor 4 respectively. In some cases, when the number of the sensors to be installed is less than that of the sensor interfaces, the sensor interfaces at the corresponding positions can be blocked by using the sealing members.
In this embodiment, the experimental apparatus for testing the shale reservoir permeability pressure further includes: the process control integration 12. The process control assembly 12 is electrically connected to the sensor, the data acquisition system 13, the first stirring member 5 and the second stirring member 7. The process control assembly 12 is electrically connected to the sensors and can integrate experimental parameters, such as temperature, pressure, conductivity, etc., into a single unit for transmission to the data acquisition system 13. The process control assembly 12 may be electrically connected to the first stirring member 5 and the second stirring member 7 to control the operating parameters of the first stirring member 5 and the second stirring member 7, such as the rotation speed, the temperature, and the like.
In addition, display instruments corresponding to the number of sensors may also be provided in the process control assembly 12. When the sensor comprises: the display instrument includes, in the case of the first sensor 1, the second sensor 2, the third sensor 3, and the fourth sensor 4: the display instrument comprises a first display instrument 8, a second display instrument 9, a third display instrument 10 and a fourth display instrument 11.
In the present embodiment, the data acquisition system 13 is used for acquiring and storing all experimental parameters. Further, the data acquisition system 13 can also display the acquired experimental data in a digital manner.
Shale has the characteristics of a semi-permeable membrane 15 (i.e., allows only water molecules to pass through, but not salt ions or allows some salt ions to pass through. One of the experimental apparatus research advantages of test shale reservoir stratum osmotic pressure that this application provided lies in: the characteristics of the semipermeable membrane 15 of the shale reservoir can be simulated by using the existing semipermeable membrane 15, and in addition, the device can also directly test the osmotic pressure of the real shale core. Furthermore, the advantage of the device can be utilized to analyze the difference between the two conditions, so that the effect of the semi-permeable membrane 15 on simulating the real shale core can be evaluated.
The experimental device for testing the osmotic pressure of the shale reservoir provided in the application specification can not only adopt the 15 modes of the semi-permeable membrane to simulate the osmotic action between the shale reservoir and the fracturing fluid, but also can place the shale core in the cylinder 14, and the contrast analysis is screened for simulating the osmotic pressure difference between the semi-permeable membrane 15 of the core and the real core.
The experimental device can slide the fastener 6 to change the position of the semipermeable membrane 15 and is used for simulating the influence of the length of the shale core and the dosage of different fracturing fluids on osmotic pressure.
The experimental device can be used for testing the osmotic pressure between the fracturing fluid and the reservoir rock and the ion exchange capacity between the fracturing fluid and the reservoir rock so as to further analyze the ion exchange mechanism in the fracturing modification process, and an effective and reliable research means is provided for researching the unconventional reservoir fracturing imbibition mechanism.
On the whole, compared with the prior art, the experimental device for testing the permeability of the shale reservoir provided by the invention has the following advantages:
(1) the device can effectively solve the problem that the osmotic pressure is difficult to test under the conditions of low salinity and high salinity existing in the prior device. Furthermore, the device has the advantages of digitization and visualization, can more intuitively observe the osmosis phenomenon in the experimental process, and can more accurately record the osmotic pressure change in real time.
(2) The method can test the osmotic pressure of the fracturing fluid and reservoir rock, can further study the dynamic process of ion exchange between the fracturing fluid and the reservoir rock, and provides an effective test means for disclosing the imbibition and displacement mechanism between the fracturing fluid and the reservoir rock in the unconventional reservoir fracturing modification process.
(3) The method can be used for researching the osmotic pressure between the fracturing fluid and reservoir rock and the ion exchange process under different reservoir temperature conditions. Furthermore, the arranged temperature sensor can accurately simulate the temperature condition of the reservoir in real time.
(4) The method can not only adopt the semi-permeable membrane 15 to simulate the imbibition displacement dynamic reaction process between shale reservoir rock and fracturing fluid, but also test the osmotic pressure between a real rock core and the fracturing fluid so as to compare and research the difference between the semi-permeable membrane 15 and the real rock core, and preferably select the semi-permeable membrane 15 and the like.
Referring to fig. 2, in the embodiment of the present application, an experimental apparatus for testing the permeability of a shale reservoir at high temperature and high pressure is provided. Specifically, the experimental method for testing the shale reservoir osmotic pressure may include the following steps:
step S10: injecting a predetermined amount of distilled water into the first chamber 141 and a predetermined amount of fracturing fluid into the second chamber 142;
step S12: the data acquisition system 13 is opened, and the experimental variation value of the preset parameter obtained by the sensor is received; the experimental variation value includes a variation value of the pressure in the first and second chambers 141 and 142;
step S14: and determining the osmotic pressure change in the shale reservoir fracturing imbibition replacement process according to the experimental change value.
When the experiment is specifically carried out, the following specific experimental steps can be included.
(1) And selecting a semi-permeable membrane 15 suitable for simulating the fracturing imbibition energy increment of the shale reservoir by combining the actual conditions of the reservoir (including conditions such as temperature, mineralization degree, pH value and reservoir permeability). Specifically, the molecular weight of the semipermeable membrane 15 for simulating the shale reservoir fracturing imbibition energy increase is determined mainly according to the condition parameters of the reservoir, and the corresponding semipermeable membrane 15 is selected according to the molecular weight.
(2) Preparing fracturing fluid with certain mineralization degree, and preparing a certain amount of fracturing fluid and distilled water according to an experimental scheme for later use. The mineralization varies for different zonal formations. Therefore, the mineralization degree of the fracturing fluid meeting the requirements of the corresponding block needs to be prepared for the water mineralization degree of the stratum of the specific reservoir according to the requirements of the stratums of different blocks.
(3) According to fig. 1, the screened semipermeable membrane 15 is tightened using the fastener 6, the sensors such as the pressure sensor and the temperature sensor are installed according to the experimental scheme, and the data acquisition system 13 is set for use.
(4) A certain amount of fracturing fluid and distilled water are injected into both ends of the cylinder 14, respectively.
(5) The external connection of an electric heating constant temperature water bath makes the liquid in the first chamber 141 and the second chamber 142 at the two ends of the semipermeable membrane 15 fully mixed, and reduces the influence on osmotic pressure caused by the concentration difference of the liquid in the same chamber as much as possible.
(6) And opening the data acquisition system 13, testing and recording the pressure, temperature and conductivity changes between the two chambers in different time according to the experimental requirements so as to explore the osmotic pressure changes in the process of imbibition and replacement of the fracturing fluid of the shale reservoir. The ion diffusion rule can be obtained through the transparent cylinder. The seepage and replacement mechanism of the fracturing fluid can be further analyzed according to the osmotic pressure change and the ion diffusion rule.
The experimental device can not only adopt the 15 modes of pellicle to simulate the osmotic effect between shale reservoir and the fracturing fluid, but also can place the shale rock core in the barrel 14, contrastively analyzes the osmotic pressure difference between the pellicle 15 and the real rock core.
Specifically, when the comparative analysis is needed, the semi-permeable membrane 15 may be taken out of the fastener 6, the core may be placed in one side of the fastener 6, for example, the first chamber 141, the fastener 6 is slid to be close to the end face of the core, and the fracturing fluid is placed in the other side of the fastener to test the osmotic pressure between the real core and the fracturing fluid. Then, when the core in the first chamber 141 is taken out, the semi-permeable membrane 15 is installed to the position of the fastener 6, distilled water is placed in the first chamber 141 in which the core is originally placed, and the magnitude of osmotic pressure between the semi-permeable membrane 15 and the fracturing fluid is tested. And comparing the two experimental results, so that the osmotic pressure difference between the semipermeable membrane 15 and the real rock core can be analyzed.
In some embodiments of the present application, the experimental device can slide the fastener 6 to change the position of the semipermeable membrane 15, so as to simulate the effect of shale core length and different amounts of fracturing fluid on osmotic pressure. It should be noted that: the semi-permeable membrane 15 is located to the junction of the first chamber 141 and the second chamber 142 from the first chamber 141 and is used for simulating the length of a real core, the distilled water consumption in the first chamber 141 is used for simulating the volume of the real core, the volume of the fracturing fluid in the second chamber 142 represents the consumption of the fracturing fluid, and the device can test the size of osmotic pressure during the change of different physical quantities and further analyze the influence of the different physical quantities on the osmotic pressure.
The experimental device provided in the embodiment of the application can be used for testing the osmotic pressure between the fracturing fluid and the reservoir rock, and also can be used for testing the ion exchange capacity between the fracturing fluid and the reservoir rock so as to further analyze the ion exchange mechanism in the fracturing modification process, thereby providing an effective and reliable research means for researching the unconventional reservoir fracturing imbibition mechanism.
In order to further explain the experimental device and method for testing the shale reservoir permeability provided by the application in detail, the practical manner of the application is exemplified by combining specific examples.
Under a specific scene, in order to simulate the osmotic pressure change rule of the high-salinity fracturing fluid, the following steps are selected:
(1) selecting a semipermeable membrane 15 with molecular weight of 50;
(2) preparing fracturing fluid with the mineralization degree of 20000mg/L, and preparing a certain amount of fracturing fluid and distilled water according to an experimental scheme for later use;
(3) according to the figure 1, the screened semipermeable membrane 15 is fastened by using a fastener 6, a pressure sensor, a temperature sensor and a data acquisition system 13 are arranged according to an experimental scheme for standby;
(4) the first chamber 141 and the second chamber 142 at two ends of the cylinder 14 are respectively injected with a certain amount of fracturing fluid and distilled water;
(5) an electric heating constant temperature water bath kettle is externally connected, the temperature is set to be 30 ℃, so that the liquid in the chambers at two ends of the semipermeable membrane 15 is fully mixed, and the influence on osmotic pressure caused by the concentration difference of the liquid in the same chamber is reduced as much as possible;
(6) the data acquisition system 13 was turned on and the pressure change between the two chambers at different times and the osmotic pressure change over time were tested and recorded as shown in figure 3.
In general, the experimental device and method for testing the shale reservoir osmotic pressure provided by the invention can rapidly and accurately obtain the shale reservoir osmotic pressure in the fracturing fluid imbibition process so as to further research the imbibition mechanism between the shale reservoir and the fracturing fluid.
Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (9)

1. The utility model provides an experimental apparatus of test shale reservoir bed osmotic pressure which characterized in that includes:
the device comprises a hollow cylinder body, wherein a semipermeable membrane for simulating the imbibition between a shale reservoir and fracturing fluid is arranged in the cylinder body; the semi-permeable membrane divides the hollow cylinder into a first chamber and a second chamber which are opposite; the semi-permeable membrane has a molecular weight cut-off of between 50 and 2000;
a fastener for securing the semi-permeable membrane; the inner wall of the cylinder body is provided with a first matching part, the fastener is provided with a second matching part matched with the first matching part, and the first matching part and the second matching part are matched to form a sliding mechanism capable of enabling the fastener to axially slide relative to the cylinder body;
a sensor for testing a predetermined parameter in the first and second chambers;
and the data acquisition system is electrically connected with the sensor and is used for storing the experimental value corresponding to the preset parameter tested by the sensor.
2. The experimental apparatus for testing shale reservoir osmotic pressure of claim 1, wherein the barrel is made of transparent acrylic tubes, and can withstand a pressure of 2 mpa and a temperature of 100 ℃.
3. The experimental apparatus for testing shale reservoir permeability according to claim 2, wherein a first stirring member is disposed within the first chamber, and a second stirring member is disposed within the second chamber.
4. The experimental facility for testing the osmolarity of a shale reservoir of claim 3, wherein the first stirring member or the second stirring member is a magnetic rotor having heating and magnetic stirring functions.
5. The experimental facility for testing shale reservoir permeability according to claim 3, wherein the sensor comprises any one or a combination of:
pressure sensor, temperature sensor, conductivity sensor, experimental apparatus still includes: the process control integration is electrically connected with the sensor, the data acquisition system, the first stirring piece and the second stirring piece.
6. An experimental method based on the experimental device for testing the shale reservoir osmotic pressure of any one of claims 1 to 5, is characterized by comprising the following steps:
injecting a predetermined amount of distilled water into the first chamber and injecting a predetermined amount of fracturing fluid into the second chamber;
opening a data acquisition system, and receiving an experimental variation value of a preset parameter obtained by a sensor; the experimental variation value comprises a variation value of pressure in the first chamber and the second chamber;
and determining the osmotic pressure change in the shale reservoir fracturing imbibition replacement process according to the experimental change value.
7. The assay method of claim 6, further comprising: determining a semi-permeable membrane for simulating fracturing seepage and suction of the shale reservoir according to the condition parameters of the shale reservoir; the condition parameters include: temperature, degree of mineralization, pH, reservoir permeability.
8. The assay method of claim 6, further comprising: and changing the position of the semipermeable membrane, and repeating the experimental steps to determine the influence of different core lengths and different amounts of the fracturing fluid on the osmotic pressure.
9. The experimental method as claimed in claim 6, wherein in the step of determining the osmotic pressure change in the shale reservoir fracturing imbibition displacement process according to the experimental change value, the magnitude of the osmotic pressure between the semipermeable membrane and the fracturing fluid can be determined; the method further comprises the following steps:
replacing distilled water in the first chamber with a core, and sliding the fastener to be close to the end face of the core;
receiving an experimental variation value of the pressure obtained by the sensor; acquiring the osmotic pressure between the rock core and the fracturing fluid according to the pressure experiment change value;
and comparing the osmotic pressure between the semi-permeable membrane and the fracturing fluid with the osmotic pressure between the rock core and the fracturing fluid.
CN201910311844.0A 2019-04-18 2019-04-18 Experimental device and method for testing shale reservoir osmotic pressure Active CN110231258B (en)

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