CN102900423A - Gel-based solid physical simulator for electrical logging detector and forming method of gel-based solid physical simulator - Google Patents

Abstract

Embodiments of the present invention provide a gel-based electrical logging detector entity physical simulation device and a forming method thereof. The device comprises: a lower surrounding rock layer, a target layer and an upper surrounding rock layer arranged sequentially from bottom to top, and a wellbore vertically penetrating through the lower surrounding rock layer, the target layer and the upper surrounding rock layer; The target layer includes the undisturbed formation of the target layer and the invasion zone of the target layer arranged in sequence from outside to inside; wherein, the wellbore vertically runs through the invasion zone of the target layer. The entity physical simulation device described in the present invention adopts hydrophilic polymer elastic gel as the key material for simulating formation modules, and the device can be used for physical simulation of full-scale electrical logging detectors, and can be used to verify , Radial detection characteristics, measurement accuracy, and the logging response characteristics of the detector including longitudinal resolution.

Description

Gel-based electrical logging detector physical simulation device and method of forming the same

technical field

The invention belongs to the research and development field of petroleum electrical logging equipment, and in particular relates to a gel-based entity physical simulation device capable of performing complex formation logging response tests on full-scale electrical logging detectors and a forming method thereof for verification Theoretical derivation and numerical simulation results of electrical logging detectors.

Background technique

As a special equipment, the detector physical simulation device is used to physically simulate the logging response characteristics (longitudinal and radial detection characteristics, measurement accuracy, longitudinal resolution, etc.) of the 1:1 full-scale detector. The numerical simulation algorithm and the key verification link of the detector manufacturing method and process, and provide a reliable basis for the optimal design of the detector. The physical simulation process (also known as logging method experiment) is an indispensable and important link in the development of electrical logging detectors, especially high-end imaging electrical logging detectors.

At present, the main methods of physical simulation and experiments in the research and production of electrical logging detectors are as follows.

1. Conductive rubber method

It is a traditional method to use conductive rubber to build physical simulation devices for electrical logging detectors. The disadvantage of this method is that the conductive medium often uses metal or non-metallic particles due to the non-hydrophilicity of rubber, which leads to a different electrical conductivity mechanism. The ionic conductivity of petroleum reservoirs is different, the coupling between different electrical modules is difficult, the large-volume vulcanization molding is very difficult, the uniformity is poor, the cost is high, and it is easy to age; therefore, it has not been widely used, especially in recent years. It is applied in the physical simulation of imaging electrical logging tools (such as array induction, three-component induction and array lateral, etc.).

2. Large volume pool method

A pool with a certain volume (beyond the effective detection range of the logging instrument, generally with a radius greater than 5 meters) contains water with a certain degree of salinity. Due to the ion conduction effect, it can simulate a certain conductivity environment in an infinite medium, which can be used to verify the instrument K value (instrument coefficient, used to complete the conversion between resistance and resistivity or conductance and conductivity); but this simple volume model device determines that the longitudinal and radial detection characteristics of the instrument cannot be examined at all, so for today's mainstream Detector characteristic verification and optimization in R&D of imaging electrical logging tools are invalid.

3. Conductive ring method

Using a metal conductive ring with impedance elements in series is a conventional method for inspection and calibration of traditional induction logging tools, which does not belong to physical simulation. Since the contribution of the actual formation distribution parameters to the receiving coil is simulated by using concentrated parameters, this method cannot be used to examine the longitudinal and radial detection characteristics of the tool. Ineffective, and this method is not suitable for electrode type electrical logging tools.

4. Experimental well method

Experimental wells generally refer to non-production wells that have a certain depth, can provide a certain pressure and temperature environment, and have typical lithology in the well (even part of the casing has been run), and can test the work of the instrument; experimental wells It is effective for the comparison between different and the same manufacturers, types, and models of instruments and the inspection of instrument stability, so it is an important technical link in the later stage of detector development; Geometric model and electrical parameters) are actually unknown, so it is impossible to verify the geometric detection characteristics of electrical logging, especially electrical imaging logging detectors; another limitation in the application of experimental well method is that the detectors tested are actually The instrument must be a complete instrument, and its detector subsystem (electrode system, coil system) and electronic control, signal amplification, data acquisition and transmission systems must all be formed in accordance with certain temperature and pressure resistance standards, which is essential for original innovation. In the early stage of research, it is actually unrealistic to compare and verify many different schemes.

In short, there is currently no method to construct an applicable physical simulation device for electrical logging detectors, which has led to a long-term The well detector cannot be effectively verified and optimized, which limits the improvement of the design level in research and development. The purpose of the present invention is to solve the important technical bottleneck in the research and development of this high-end electrical logging detector.

Contents of the invention

The object of the present invention is to provide a gel-based electrical logging detector physical simulation device and its forming method to solve the physical simulation problem of electrical logging detectors in complex formation environments.

To achieve the above purpose, on the one hand, an embodiment of the present invention provides a method for forming a gel-based electrical logging detector entity physical simulation device, the method comprising:

forming a holding container for a physical physical simulation device;

forming a wellbore container, and disposing the wellbore container in the center of the carrying container;

Configure the gel with the required resistivity of the lower surrounding rock, and fill the gel with the required resistivity of the lower surrounding rock between the bearing container and the wellbore container to reach the thickness of the lower surrounding rock, completely After solidification, the surrounding rock layer is formed;

forming an intrusion zone container with a hollow through hole, the intrusion zone container is arranged in the bearing container and located on the lower surrounding rock layer, the intrusion zone container covers the wellbore container through the hollow through hole located within;

Configure the gel with the resistivity required by the original formation of the target layer, and fill the gel with the resistivity required by the original formation of the target layer between the bearing container and the invasion zone container to achieve the thickness of the target layer , to form the original formation of the target layer after complete solidification;

Configure the gel with the required resistivity of the invasion zone, and fill the gel with the required resistivity of the invasion zone into the invasion zone container to achieve the thickness of the target layer invasion zone, and form the target layer invasion after complete curing Zone, the undisturbed formation of the target layer and the invasion zone of the target layer constitute the target layer;

Configure the gel with the required resistivity of the upper surrounding rock, and fill the gel with the required resistivity of the upper surrounding rock between the bearing container and the wellbore container and above the target layer, to achieve The thickness dimension of the surrounding rock, which forms the surrounding rock layer after it is completely solidified.

To achieve the above purpose, on the other hand, an embodiment of the present invention provides a physical simulation device for a gel-based electrical logging detector, which includes:

The lower surrounding rock layer, the target layer and the upper surrounding rock layer arranged in sequence from bottom to top, and the wellbore vertically passing through the lower surrounding rock layer, the target layer and the upper surrounding rock layer;

The target layer includes the undisturbed formation of the target layer and the invasion zone of the target layer arranged in sequence from outside to inside; wherein, the wellbore vertically runs through the invasion zone of the target layer.

The beneficial effects of the above-mentioned technical solutions provided by the embodiments of the present invention are:

The method and device can conveniently simulate various formation sizes and conductivity characteristics. The entity physical simulation device described in the present invention adopts hydrophilic polymer elastic gel as the key material for simulating formation modules, and the device can be used for physical simulation of full-scale electrical logging detectors, and can be used to verify , Radial detection characteristics, measurement accuracy, and the logging response characteristics of the detector including longitudinal resolution.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the structural cross-sectional schematic diagram of the electrical logging detector physical simulation device of the embodiment of the present invention;

Fig. 2 is a flow chart of the method for forming the electrical logging detector physical simulation device according to the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiments of the present invention provide a physical simulation device capable of performing complex formation logging response tests on full-scale electrical logging detectors, used to verify theoretical and numerical simulation results of electrical logging detectors, and to improve and optimize detector design parameters, the device has important practical value for the research and development of petroleum electrical logging equipment, especially high-end equipment. In the embodiment of the present invention, hydrophilic polymer elastic gel and a certain concentration of inorganic salt solution are used to form rubber blocks with different resistivities cured at room temperature, which are used as various formation modules and assembled according to a certain process to simulate complex Solid physical model of strata (including upper and lower surrounding rocks, intrusion zone and undisturbed strata, wellbore, etc.).

Fig. 1 is a schematic structural diagram of a physical simulation device for a gel-based electrical logging detector according to an embodiment of the present invention. The reference numerals in Fig. 1 are explained as follows:

A tested electrical logging detector (coil type or electrode type);

B wellbore (recommended diameter 0.2m, typical resistivity of well fluid 2Ω m);

C simulated surrounding rock strata (the recommended thickness is greater than 1/2 the length of the detector, and the typical resistivity is 50Ω·m);

D simulated invasion zone of target layer (recommended thickness of target layer is 1m, typical resistivity of invasion zone is 5Ω·m);

E simulates the original formation of the target layer (the recommended thickness of the target layer is 1m, and the typical resistivity is 10Ω·m);

F simulated lower surrounding rock strata (the recommended thickness is greater than 1/2 the length of the detector, and the typical resistivity is 50Ω·m);

G wellbore extension (recommended depth is greater than 1/2 length of the detector).

As shown in Fig. 1, the physical simulation device of the electrical logging detector includes: the lower surrounding rock layer F, the target layer (D and E) and the upper surrounding rock layer C arranged in sequence from bottom to top, and the vertically penetrating lower surrounding rock layer Wellbore B of rock formation F, target layers (D and E) and surrounding rock formation C; the target layer includes the original formation E of the target layer and the intrusion zone D of the target layer arranged in sequence from outside to inside; wherein, the wellbore B is vertical It penetrates zone D directly through the target layer.

In one embodiment, the lower surrounding rock layer, the upper surrounding rock layer, the undisturbed formation of the target layer and the invasion zone of the target layer have different resistivities respectively. In another embodiment, the lower surrounding rock layer and the upper surrounding rock layer have the same resistivity, and the lower surrounding rock layer, the undisturbed formation of the target layer and the invasion zone of the target layer have different resistivities respectively.

In this embodiment, the above-mentioned lower surrounding rock layer, upper surrounding rock layer, undisturbed formation of the target layer, and the invasion zone of the target layer are respectively formed by curing different gels, and the gels corresponding to each layer are formed by adding hydrophilic The elastic polymer elastic gel is mixed with inorganic salt solutions with different ion concentrations and boiled to form.

In this embodiment, the lower surrounding rock layer is formed after solidification of the gel with the required resistivity of the lower surrounding rock; the original formation of the target layer is formed after solidification of the gel with the required resistivity of the original formation of the target layer ; The invasion zone of the target layer is formed after solidification of the gel with the resistivity required by the invasion zone; the upper surrounding rock layer is formed after solidification of the gel with the required resistivity of the upper surrounding rock.

Optionally, in one embodiment, the above-mentioned gel with the resistivity required for the lower surrounding rock, the gel with the resistivity required for the undisturbed formation of the target layer, the gel with the resistivity required for the invasion zone, and the gel with the upper surrounding Rock gels of desired resistivity were filled with plastic microbeads. Preferably, the diameter of the plastic microbeads is 0.5mm-5mm.

Specifically, a certain proportion of hydrophilic polymer elastic gel, pure water and inorganic salt (that is, inorganic salt solution) are mixed and boiled to form a fluid gel, and plastic microgels are optionally filled during the injection or filling process. Beads, injection molding in batches (after injecting one layer, you must wait for solidification before injecting another layer with different resistivity, otherwise the two layers will produce undesired mixing), after cooling and solidification, you can obtain solidified beads with different resistivity The glue module is used to simulate strata with different geometric dimensions such as the required target layer, intrusion zone and surrounding rock.

The reason why the gel in the embodiment of the present invention is filled with plastic microbeads is that, on the one hand, the vertical pressure bearing capacity of the module can be increased, and on the other hand, the conductive capacity of the module can be reduced through the porous conductive channel, so as to simulate the higher resistivity. The ion concentration is not so low that it is difficult to achieve. The diameter of plastic microbeads can be selected between 0.5~5mm. If the diameter is too large, the effect of restricting conduction will become insignificant. For high resistivity modules, plastic microbeads with smaller diameters should be selected. In the case of a certain ion concentration, mixing microbeads with different diameters in a certain proportion can obtain higher resistivity (simulation such as tight surrounding rock formations, high oily reservoirs). As an example, 20% of the beads are 5 mm in diameter and 80% are 1 mm in diameter.

Optionally, in another embodiment, the above-mentioned gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, the gel with the required resistivity of the invasion zone, and the gel with the required upper Different inorganic pigments have been mixed into the gel with the required resistivity of the surrounding rocks to identify the simulated layers.

Optionally, the device may further include: a plurality of conductivity probes implanted in the lower surrounding rock layer, the target layer and the upper surrounding rock layer, and the plurality of conductivity probes are connected to the data acquisition system. Several conductivity probes are implanted in each simulated formation module, and the measurement performance of the detector is accurately verified by monitoring the electrical properties of the simulated formation module in real time.

In this embodiment, a hydrophilic polymer elastic gel is used to construct a solid physical simulation device applied to an electrical logging detector. Hydrophilic polymer elastic gel and salt solution are used in a certain proportion to form glue blocks with different resistivities cured at room temperature, which are used as formation modules with different resistivities, and different inorganic salt compounds can be used to obtain the required ion types ( Such as sodium, calcium, magnesium, potassium, etc.), different ion concentrations (also known as salinity) can obtain different resistivity (or conductivity), and different structures and different electrical conductivity can be simulated by gradually forming or assembling multiple rubber blocks. However, each colloidal module can maintain its own electrical properties, and the coupling interface between the modules can form an interface similar to the ion concentration change in the actual permeable formation (also called an electric double layer). Therefore, it is the key innovation of the present invention to be able to more realistically and quantitatively simulate the actual complex formation.

In this example, since the mechanical strength of the hydrophilic polymer elastic gel is not high, a hoisting device with accurate positioning performance should be used to hoist the experimental detector in use, and an appropriate counterweight should be added to the bottom of the detector To ensure that it is centered and stable within the "wellbore" of the physical simulation device.

If there are components below the detector that are not directly related to the detector itself (such as an electronic sub-joint), a hole equivalent to the size of the borehole (commonly known as a rat hole, which is the lower part of the simulation device in Figure 1) needs to be reserved under the center of the simulation device. Cylinder G constructed with dotted lines). In one embodiment, the mouse hole G is a part of the simulation device. The function of this part is to enable the detector to be placed in the simulated formation, and components such as the electronic sub-joint at the lower part of the detector can be placed in the cave. Part G is exactly the cavern connected with the borehole that is arranged at the bottom of the simulation device, and its diameter is exactly the same as that of the borehole. It is recommended to leave a mouse hole, so that slowly raising or lowering the detector can accurately simulate the signal dynamic response process when passing through the formation interface, which is often required for the verification of detector performance.

The structure of the model in the present invention is axisymmetric (that is, it can be described by a cylindrical coordinate system). When the wellbore is "inserted" into the formation at an angle, conditions are created that allow the simulation of more complex formations. That is to say, the complex formations under deviated boreholes can be simulated by adopting appropriate technology, which is very critical for high-end three-dimensional imaging logging detectors such as three-component induction logging detectors and non-push-by azimuth array lateral logging detectors. The complex response verification of is also a method that the present invention can further extend.

The advantages of the electrical logging detector entity physical simulation device in the embodiment of the present invention are:

The device can conveniently simulate various formation sizes and conductivity characteristics. Moreover, the entity physical simulation device described in the present invention adopts hydrophilic polymer elastic gel as the key material for simulating formation modules, and the device can be used for physical simulation of full-scale electrical logging detectors, and can be used for verification including Longitudinal and radial detection characteristics, measurement accuracy, and logging response characteristics of detectors including vertical resolution.

Fig. 2 is a flowchart of a method for forming a gel-based electrical logging detector physical simulation device according to an embodiment of the present invention. As shown in Figure 2, according to the typical formation model shown in Figure 1, the method for forming the electrical logging detector entity physical simulation device proposed by the embodiment of the present invention includes the following steps:

110. Form a carrying container of a physical simulation device.

Specifically, cement drums made of plastic plates, hot-melt welded or bricks can be used as containers for carrying physical simulation devices.

120. Form a wellbore container, and place the wellbore container in the center of the carrying container.

Specifically, this step is to position and place a columnar water-filled container serving as a wellbore. The columnar shape is only a preferred embodiment and should not be construed as a limitation to the embodiment of the present invention.

130. Configure the gel with the required resistivity of the lower surrounding rock, and fill the gel with the required resistivity of the lower surrounding rock between the bearing container and the wellbore container to reach the thickness of the lower surrounding rock , and form the lower surrounding rock layer after complete solidification.

140. Form an intrusion zone container with a hollow through hole, set the intrusion zone container in the carrying container and on the lower surrounding rock layer, and connect the wellbore through the hollow through hole The container is sleeved inside.

Specifically, in this step, the water-filled container serving as the intrusion zone is sleeved outside the water-filled container serving as the wellbore, and is located above the lower surrounding rock layer/module.

In steps 120 and 140, a thicker (such as 0.2-0.5mm) plastic film with higher strength is used to make the wellbore container and the invasion zone container respectively according to the size of the wellbore and the size of the invasion zone module, and the above containers are connected with The water pipe can be closed, filled with water and kept in shape under a certain pressure to act as a mold for colloidal molding. After the colloid is formed, the water can be pumped out to realize demoulding. The shape of each container is not limited to the columnar shape shown as an example.

150. Configure the gel with the resistivity required by the undisturbed formation of the target layer, and fill the gel with the resistivity required by the undisturbed formation of the target layer between the bearing container and the invasion zone container to reach the target layer Thickness dimension, after complete solidification, the undisturbed formation of the target layer is formed.

160. Configure the gel with the resistivity required for the intrusion zone, and fill the gel with the resistivity required for the intrusion zone into the intrusion zone container to achieve the thickness of the target layer intrusion zone, and form the target after complete curing Intrusion zone of the target layer, the undisturbed formation of the target layer and the invasion zone of the target layer constitute the target layer.

Specifically, this step is to pump out the water in the water-filled container serving as the intrusion zone so that it can be taken out, configure the gel with the required resistivity of the intrusion zone, and fill it in the intrusion zone container to the thickness of the target layer, Until it is completely cured to form the target layer invasion zone. So far, the target layer module including the invasion zone and the undisturbed formation has been formed.

170. Configure the gel with the required resistivity of the upper surrounding rock, and fill the gel with the required resistivity of the upper surrounding rock between the bearing container and the wellbore container and above the target layer , reaching the thickness of the upper surrounding rock, and forming the upper surrounding rock layer after complete solidification.

Specifically, this step is the same as the step 130 of forming the lower surrounding rock layer.

Specifically, the configuration of the gel with the required resistivity of the lower surrounding rock includes: using the hydrophilic polymer elastic gel and the first inorganic salt solution with the first ion concentration to configure according to a specified ratio to form a gel with the lower surrounding rock The gel with the required resistivity; the above configuration refers to mixing the corresponding inorganic salt solution of the hydrophilic polymer elastic gel and then boiling or heating.

The configuration of the gel with the required resistivity of the original formation of the target layer includes: using the hydrophilic polymer elastic gel and the second inorganic salt solution with the second ion concentration to configure according to a specified ratio, so as to form the original formation with the target layer A gel of the desired resistivity;

The configuration of the gel with the resistivity required for the invasion zone includes: using the hydrophilic polymer elastic gel and the third inorganic salt solution with a concentration of three ions to configure according to a specified ratio to form a gel with the resistivity required for the invasion zone. gel;

The configuration of the gel with the required resistivity of the upper surrounding rock includes: using the hydrophilic polymer elastic gel and the fourth inorganic salt solution with the fourth ion concentration to configure according to a specified ratio to form the required resistivity of the upper surrounding rock. rate of gel.

Further, the method also includes the following steps: in the gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, the gel with the required resistivity of the invasion zone, the gel with the required resistivity During the formation of the gel with the required resistivity of the surrounding rock, plastic microbeads were incorporated into each gel. Optionally, the diameter of the plastic microbeads is 0.5-5 mm.

Further, the method may also include the following steps: in the gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, the gel with the required resistivity of the invasion zone, Different inorganic pigments were mixed into the gel with the required resistivity of the surrounding rock to identify the simulated horizon.

In this example, according to the nature of the gel, the original gum (hydrophilic polymer elastic gel), pure water, and inorganic salts are mixed, boiled at a specified temperature (usually in a water bath), and cooled to a certain temperature Finally, add plastic microbeads to ensure the mechanical strength of the module and achieve the required simulated resistivity value. You can also add a small amount of inorganic pigments in the gel to color-mark the simulated layers.

It should be noted that different gels have different mixing water ratios, curing temperatures, and strengths. This is a matter of specific technology and materials, and its parameter variation range and operation allowable range are very large, and it has nothing to do with the essence of the present invention, so it does not need to be specified or defined in detail. The essence of the innovative idea of the present invention is: by forming and maintaining gel blocks with different ion concentrations to simulate the combination of various formations with different resistivities (this is exactly what the existing methods have not done well. -as described in the background technology of the present invention); the "prescribed temperature", "certain temperature" and "certain ratio" mentioned above in the present invention are as descriptions of the process, and are only a reminder. Make adjustments.

Further, the method may further include the following step: setting two plate-shaped electrodes on both sides of the carrying container, serving as B electrodes and N electrodes of the electrode-type electrical logging detector respectively. Specifically, two plate-shaped electrodes with a surface area of not less than ^0.1m2 are placed on both sides of the holding container, which are respectively used as the B electrode (screen current loop electrode) and N electrode (main current loop electrode) of the electrode type (current focusing) electrical logging detector. electrodes), these electrodes have no function or influence on the coil electric logging detector.

Further, the method also includes the following steps: pumping out the water in the water-filled container (i.e., the wellbore container) serving as the wellbore so that the wellbore container can be taken out, and injecting the part of the volume into water with a certain ion concentration of the required resistivity to act as the wellbore. well fluid. The wellbore is geometrically axisymmetric, and the hollow part is filled with well fluid (also an ionic aqueous solution) and is wrapped by a gel-simulated formation (the so-called bearing).

Further, the method also includes the following steps: when each module is "pouring", several (3 or more) conductivity probes need to be symmetrically placed close to the outer edge of the module; such probes use bipolar four-wire mode (a pair of current loops and a pair of voltage loops, respectively connected to shielded twisted pairs and then wound as a whole, and then drawn out), the back of the probe electrode is insulated to reduce the influence of external conduction; these probes are connected to the data acquisition system during work. Based on the real-time monitoring of the conductivity of the module, it can correct the influence of temperature and time variation on the measurement parameters of the detector, so that the physical simulation results are accurate and reliable.

So far, a typical implementation process of the present invention is completed. Since the mechanical strength of the hydrophilic polymer elastic gel is not high, a lifting device with accurate positioning performance should be used to hoist the experimental detector in use, and an appropriate counterweight is added to the bottom of the detector to ensure that it is in the physical simulation device. The "wellbore" is centered and stable.

If there are components below the detector that are not directly related to the detector itself (such as an electronic nipple), a hole equivalent to the size of the wellbore should be reserved under the center of the device described in this method (commonly known as a rat hole, simulated in Figure 1 The lower part of the device is a cylinder constructed with dotted lines). It is recommended to leave a mouse hole, so that slowly raising or lowering the detector can accurately simulate the signal dynamic response process when passing through the formation interface, which is often required for the verification of detector performance.

During the "casting" of each layer of sol, fusion and penetration between layers is allowed and beneficial for a realistic simulated formation. The influence (on the radial and longitudinal response characteristics) caused by a certain error (such as not more than ±3cm) of the model in the manufacturing size is completely negligible, because the measurement accuracy and spatial resolution of any electrical logging detector itself Not high, the relative error is usually ±2%~10% (the error is even much larger at both ends of the measurement dynamic range).

The advantage of the method embodiment of the present invention is that the device formed by the method can conveniently simulate various formation sizes and conductivity characteristics. The entity physical simulation device described in the present invention adopts hydrophilic polymer elastic gel as the key material for simulating formation modules, and the device can be used for physical simulation of full-scale electrical logging detectors, and can be used to verify , Radial detection characteristics, measurement accuracy, and the logging response characteristics of the detector including longitudinal resolution.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions recorded in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. A method for forming a gel-based electrical logging detector entity physical simulation device, characterized in that, the method comprises: forming a holding container for a physical physical simulation device; forming a wellbore container, and disposing the wellbore container in the center of the carrying container; Configure the gel with the required resistivity of the lower surrounding rock, and fill the gel with the required resistivity of the lower surrounding rock between the bearing container and the wellbore container to reach the thickness of the lower surrounding rock, completely After solidification, the surrounding rock layer is formed; forming an intrusion zone container with a hollow through hole, the intrusion zone container is arranged in the bearing container and located on the lower surrounding rock layer, the intrusion zone container covers the wellbore container through the hollow through hole located within; Configure the gel with the resistivity required by the original formation of the target layer, and fill the gel with the resistivity required by the original formation of the target layer between the bearing container and the invasion zone container to achieve the thickness of the target layer , to form the original formation of the target layer after complete solidification; Configure the gel with the required resistivity of the invasion zone, and fill the gel with the required resistivity of the invasion zone into the invasion zone container to achieve the thickness of the target layer invasion zone, and form the target layer invasion after complete curing Zone, the undisturbed formation of the target layer and the invasion zone of the target layer constitute the target layer; Configure the gel with the required resistivity of the upper surrounding rock, and fill the gel with the required resistivity of the upper surrounding rock between the bearing container and the wellbore container and above the target layer, to achieve The thickness dimension of the surrounding rock, which forms the surrounding rock layer after it is completely solidified. 2. The method of claim 1, wherein, The configuration of the gel with the required resistivity of the surrounding rock includes: using the hydrophilic polymer elastic gel and the first inorganic salt solution with the first ion concentration to configure according to a specified ratio to form the required resistivity of the surrounding rock. rate of gel; The configuration of the gel with the resistivity required by the undisturbed formation of the target layer includes: using the hydrophilic polymer elastic gel and the second inorganic salt solution with the second ion concentration to configure according to a specified ratio to form the undisturbed formation with the target layer. Gels that require resistivity; The configuration of the gel with the required resistivity of the invasion zone includes: using the hydrophilic polymer elastic gel and the third inorganic salt solution with the third ion concentration to configure according to a specified ratio to form a gel with the required resistivity of the invasion zone. gel; The configuration of the gel with the required resistivity of the upper surrounding rock includes: using the hydrophilic polymer elastic gel and the fourth inorganic salt solution with the fourth ion concentration to configure according to a specified ratio to form the required resistivity of the upper surrounding rock. rate of gel. 3. The method according to claim 2, wherein the method further comprises: The gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, the gel with the required resistivity of the intrusion zone, and the gel with the required resistivity of the upper surrounding rock During the formation process, plastic microbeads were incorporated into each gel separately. 4. The method according to claim 3, characterized in that the diameter of the plastic microbeads is 0.5mm-5mm. 5. The method according to claim 2 or 3, wherein the method further comprises: The gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, the gel with the required resistivity of the intrusion zone, and the gel with the required resistivity of the upper surrounding rock Different inorganic pigments were mixed in to identify the simulated layers. 6. The method according to claim 1, further comprising: Two plate-shaped electrodes are arranged on both sides of the carrying container, which are respectively used as B electrodes and N electrodes of the electrode-type electrical logging detector. 7. A gel-based electrical logging detector physical simulation device, characterized in that the device comprises: The lower surrounding rock layer, the target layer and the upper surrounding rock layer arranged in sequence from bottom to top, and the wellbore vertically passing through the lower surrounding rock layer, the target layer and the upper surrounding rock layer; The target layer includes the undisturbed formation of the target layer and the invasion zone of the target layer arranged in sequence from outside to inside; wherein, the wellbore vertically runs through the invasion zone of the target layer. 8. The device of claim 7, wherein: The lower surrounding rock layer, the upper surrounding rock layer, the undisturbed formation of the target layer and the invasion zone of the target layer have different resistivities respectively; or, The lower surrounding rock layer and the upper surrounding rock layer have the same resistivity, and the lower surrounding rock layer, the undisturbed formation of the target layer and the invasion zone of the target layer have different resistivities respectively. 9. The device according to claim 7, characterized in that, the lower surrounding rock layer, the upper surrounding rock layer, the undisturbed formation of the target layer and the invasion zone of the target layer are respectively solidified by different gels After forming, the gel corresponding to each layer is formed by mixing and boiling the hydrophilic polymer elastic gel respectively with inorganic salt solutions with different ion concentrations. 10. Apparatus according to claim 7, 8 or 9, characterized in that The lower surrounding rock layer is formed by solidifying the gel with the required resistivity of the lower surrounding rock; The undisturbed formation of the target layer is formed by solidifying the gel with the required resistivity of the undisturbed formation of the target layer; The invasion zone of the target layer is formed after solidification of a gel having the resistivity required for the invasion zone; The upper surrounding rock layer is formed by solidifying the gel with the resistivity required by the upper surrounding rock. 11. The device according to claim 10, characterized in that, the gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, and the gel with the required resistivity of the invasion zone The gel and the gel with the required resistivity of the surrounding rock are respectively filled with plastic microbeads. 12. The device according to claim 10, characterized in that, the gel with the required resistivity of the lower surrounding rock, the gel with the required resistivity of the undisturbed formation of the target layer, and the gel with the required resistivity of the invasion zone Different inorganic pigments have been mixed into the gel and the gel with the required resistivity of the surrounding rock to mark the simulated horizon. 13. The device according to claim 7, further comprising: A plurality of conductivity probes implanted in the lower surrounding rock layer, the target layer and the upper surrounding rock layer, and the plurality of conductivity probes are connected to a data acquisition system.

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