Experimental device and experimental method for researching elutriation mechanism of hydrogen sulfide in sulfur-containing gas reservoir

Abstract

The invention discloses an experimental device and an experimental method for researching a hydrogen sulfide elutriation mechanism of a sulfur-containing gas reservoir, and belongs to the technical field of natural gas exploitation, the experimental device for researching the hydrogen sulfide elutriation mechanism of the sulfur-containing gas reservoir comprises an artificial core model; at least one acquisition element; and at least one pipe body part and an injection-production assembly. By arranging the pipe body part composed of the inner pipe part and the outer pipe part which can rotate oppositely, the position relation between the inner outlet set on the inner pipe part and the outer outlet set on the outer pipe part can be correspondingly adjusted through relative rotation between the inner pipe part and the outer pipe part, so that the pipe body part and the artificial rock core model are communicated at different layer positions, and the artificial rock core model can be conveniently and rapidly constructed. Therefore, the control operation of the gas injection-production layer is realized, and the simulation of different reservoirs is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of natural gas exploitation, and in particular relates to an experimental device and an experimental method for studying the hydrogen sulfide washing mechanism of sulfur-containing gas reservoirs. Background Art

[0002] At present, many high-sulfur gas reservoirs are in the late stage of development. When using these gas reservoirs to build gas storage facilities, it is necessary to carry out hydrogen sulfide washing, that is, inject clean natural gas into the sulfur-containing gas reservoir, and then produce the sulfur-containing natural gas in the gas reservoir after a period of mixing. After several injections of clean gas and production, the hydrogen sulfide content in the gas reservoir is reduced to below the standard content, so as to meet the requirements for natural gas storage in subsequent gas storage facilities. However, the mechanism of hydrogen sulfide washing is still unclear, and the distribution of hydrogen sulfide during the washing process of sulfur-containing gas reservoirs is also unclear, and the distribution of hydrogen sulfide cannot be observed intuitively.

[0003] At present, the research on the purification of sulfur-containing gas reservoirs mostly relies on numerical simulation, because hydrogen sulfide is colorless and cannot be distinguished when mixed with natural gas. It is impossible to observe the distribution of hydrogen sulfide through experimental testing. At the same time, since the gas reservoir contains multiple layers of reservoirs, the concentration distribution of hydrogen sulfide in different reservoirs varies greatly, and the existing simulation methods cannot achieve the simulation of different reservoir layers. Summary of the invention

[0004] The purpose of the present invention is to provide an experimental device and an experimental method for studying the hydrogen sulfide washing mechanism of sour gas reservoirs, so as to solve the research problem of purification of sour gas reservoirs proposed in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs, comprising:

[0006] an artificial core model configured to simulate a natural gas reservoir structure;

[0007] at least one collection element, one end of which is configured to be able to enter the artificial core model and to collect hydrogen sulfide concentration data;

[0008] At least one tubular member, one end of which is configured to enter the artificial core model, the tubular member comprising an inner tube member and an outer tube member which are relatively rotatable, the inner tube member being provided with an inner outlet group, the outer tube member being provided with an outer outlet group, and the positional relationship between the inner outlet group and the outer outlet group changing based on the rotation between the inner tube member and the outer tube member;

[0009] The injection and production assembly is fluidically connected to the artificial core model through the tubular body component.

[0010] Preferably, the plurality of inner outlets constituting the inner outlet group are distributed at intervals along the axial direction of the tube body component.

[0011] Preferably, the outer outlet group comprises at least two outer outlet units spaced apart in the circumferential direction of the tube body component, and the outer outlet constituting a single outer outlet unit is arranged along the axial direction of the tube body component.

[0012] Preferably, the artificial core model includes at least a double-layer core structure in the vertical direction, and different layers of reservoir structures have at least different permeabilities and / or porosities.

[0013] Preferably, the artificial core model is divided into a plurality of detection intervals in the horizontal direction, and the acquisition element is arranged based on the detection intervals.

[0014] Preferably, the injection-production assembly comprises a first pipeline, and the first pipeline comprises:

[0015] A first section, one end of which is connected to the tube member;

[0016] The second section includes at least two pipelines with a dispersed end and a contact end. The dispersed ends of the multiple pipelines extend independently and are each provided with a valve. The contact ends of the multiple pipelines are each connected to the first section.

[0017] Preferably, the injection and production assembly further comprises:

[0018] A second pipeline, one end of which is connected to the first section, and the other end of which is provided with a gas recovery device, and a pump body and a valve are provided on the second pipeline.

[0019] Preferably, a pressure gauge is provided on the first section.

[0020] Preferably, the experimental device further comprises a container component, wherein the container component defines an experimental area which can accommodate the artificial core model and can be evacuated.

[0021] The present application also discloses an experimental method for studying the hydrogen sulfide washing mechanism of a sour gas reservoir. The method is implemented based on the above experimental device and comprises:

[0022] placing the artificial core model in an experimental space in the container component, and evacuating the experimental space;

[0023] injecting sour natural gas into different layers in the artificial core model based on experimental requirements, and stopping the injection after the pressure in the artificial core model reaches a first preset pressure;

[0024] The artificial core model is left to stand until the internal pressure remains stable, and the concentration of hydrogen sulfide in the artificial core model is recorded;

[0025] Injecting natural gas into the artificial core model, and stopping the injection when the pressure in the artificial core model reaches a second preset pressure, and monitoring and recording the hydrogen sulfide concentration data in the artificial core model in real time during the injection process;

[0026] The artificial core model is left to stand until the internal pressure remains stable before gas extraction is carried out, and the concentration of hydrogen sulfide in the artificial core model is monitored in real time during the gas extraction process.

[0027] Preferably, the injection of different layers in the artificial core model is selected based on the positional relationship between the inner outlet group in the inner tube component and the outer outlet group in the outer tube component.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present application provides a tube body component consisting of an inner tube component and an outer tube component that can rotate relative to each other. Through the relative rotation between the inner tube component and the outer tube component, the positional relationship between the inner outlet group on the inner tube component and the outer outlet group on the outer tube component can be correspondingly adjusted, so that the tube body component and the artificial core model are connected at different layer positions, thereby realizing the control operation of the gas injection and production layer to achieve the simulation of different reservoir layers.

[0030] 2. In this application, the three-dimensional artificial core model includes at least two layers of three-dimensional artificial cores with different permeabilities and porosities. The upper layer simulates a low-permeability reservoir, and the lower layer simulates a high-permeability reservoir. The layers are longitudinally spliced ​​to obtain a three-dimensional artificial core to simulate the longitudinal heterogeneity of the reservoir. In the actual operation process, two or more layers of three-dimensional artificial cores can be designed to improve the accuracy of the experimental process.

[0031] 3. In the present application, the three-dimensional artificial core is divided into several detection intervals, and a hydrogen sulfide probe for measuring hydrogen sulfide is buried in the middle of each detection interval; in conjunction with the second detector, the three-dimensional distribution of hydrogen sulfide in space can be obtained, and then a cloud map of the hydrogen sulfide content distribution can be obtained.

[0032] 4. In this application, pipe body components are placed in the four corners of the three-dimensional artificial core to simulate the injection and production wells in the gas reservoir. The injection and production wells can penetrate two layers of core to simulate a full wellbore perforation; or the upper half of the core can be perforated to simulate a partial wellbore perforation. Different degrees of wellbore perforation can be simulated according to actual needs.

[0033] 5. In the present application, a container component is provided on the outside of the three-dimensional artificial core model. On the one hand, it can facilitate the monitoring of whether there is leakage in the entire device and eliminate the factors that cause inaccurate simulation effects of the experimental device due to leakage; on the other hand, it can prevent gas from leaking into the environment and polluting the air, while avoiding safety accidents caused by gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1The overall schematic diagram of the experimental device;

[0035] Figure 2 This is a schematic diagram of the artificial core model;

[0036] Figure 3 This is a schematic diagram of the artificial core model partitioning;

[0037] Figure 4 It is a schematic diagram of the pipe body parts;

[0038] Figure 5 It is a schematic diagram of the outer tube components;

[0039] Figure 6 It is a schematic diagram of the inner tube components;

[0040] Figure 7 Schematic diagram of the injection and production components.

[0041] In the figure:

[0042] 100. container component; 101. vacuum pump; 102. first detector;

[0043] 200. Artificial core model; 201. Measurement interval;

[0044] 300, acquisition element; 301, second detector; 302, processing terminal;

[0045] 400, tube body component; 401, inner tube component; 402, outer tube component; 403, inner outlet group; 404, outer outlet group;

[0046] 500, injection and production assembly; 501, first pipeline; 502, first section; 503, second section; 504, first supply line; 505, second supply line; 506, third detector; 507, second pipeline; 508, gas recovery device; 509, pressure gauge. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] An experimental device for studying the mechanism of hydrogen sulfide washing in sour gas reservoirs (hereinafter referred to as the experimental device) is described in detail. Figure 1The experimental device includes a container part 100. Exemplarily, the container part 100 is configured as a square box or a cylindrical barrel, and a vacuumable experimental area is defined in the container part 100, that is, the experimental area in the container part 100 can be closed and can be vacuumed by a vacuum pump 101, etc., and a vacuum environment experimental area is constructed. In some embodiments, the experimental device also includes a vacuum pump 101 for vacuuming the above-mentioned container part 100.

[0049] Continue to refer to Figure 1 In some embodiments, the experimental device further includes a first detector 102, which is configured to measure the concentration of hydrogen sulfide in the experimental interval within the container component 100 to determine whether there is hydrogen sulfide leakage in the experimental interval, and to eliminate factors that cause inaccurate simulation effects of the experimental device due to leakage. At the same time, due to the existence of the container component 100, that is, the subsequent artificial core model 200 is in the experimental interval within the container component 100 during the model experiment, it can be avoided that gas leaks into the environment and pollutes the air, and at the same time, safety accidents caused by gas leakage can be avoided; in other embodiments, the first detector 102 can also be connected to an alarm (not shown in the figure). When the first detector 102 detects hydrogen sulfide leakage in the experimental interval, the alarm sounds an alarm to remind the staff to inspect the artificial core model 200 model and eliminate the cause of the fault.

[0050] Continue to refer to Figure 1 , 2And 3, the above-mentioned experimental device also includes an artificial core model 200 model, which is constructed to extend in the horizontal direction and include at least two layers of reservoir structure in the vertical direction (i.e., perpendicular to the horizontal plane), and different layers of reservoir structure have at least different permeabilities and / or porosities to achieve simulation of different reservoirs. Exemplarily, the artificial core model 200 model is constructed as a double-layer structure in the vertical direction, wherein the upper layer is used to simulate the low-permeability reservoir and the lower layer is used to simulate the high-permeability reservoir, and the artificial core model 200 model is constructed as a large-scale three-dimensional physical model to make the model closer to the actual reservoir structure, thereby reducing the experimental error. At the same time, the model is made based on the principle of similarity. First, the geometric similarity is the shape and size of the model. Similar to the actual gas storage reservoir, and similar physical properties, the upper and lower layers simulate the heterogeneity of the reservoir, the model is established according to the pore structure with consistent permeability and porosity of the actual reservoir, and the well locations are also arranged in one-fourth according to the nine-point method of the actual reservoir. The physical model can simulate different injection and production methods of the gas storage reservoir, such as simultaneous injection and production, one injection and one production, or multiple injections and multiple productions, which are consistent with the injection and production methods of the real gas storage reservoir, so that the actual gas reservoir can be simulated for hydrogen sulfide washing process. Furthermore, in some embodiments, the above-mentioned artificial core model 200 model needs to be cast and sealed during the production process to form a coating layer made of materials such as epoxy resin on the periphery of the artificial core model 200 model, thereby achieving the sealing of the artificial core model 200 model.

[0051] In some embodiments, the artificial core model 200 is divided into a plurality of measurement intervals 201 in the horizontal direction. Figure 3 The artificial core model 200 is evenly divided in the horizontal direction, for example, by horizontal and vertical staggered lines to divide it into a number of square measurement intervals 201, and the collection elements 300 (such as subsequent hydrogen sulfide probes) are arranged based on the division of the measurement intervals 201;

[0052] 1, the experimental device further comprises a plurality of collecting elements 300, which are configured to be able to enter (such as be inserted into) different layers in the artificial core model 200 and collect hydrogen sulfide concentration data. For example, a hydrogen sulfide probe is selected as the collecting element 300. When in use, one end of the hydrogen sulfide probe is inserted into different layers of the artificial core model 200 from a vertical direction, and the other end of the hydrogen sulfide probe extends from the artificial core model 200 and is electrically connected to a second detector 301, and the second detector 301 is electrically connected to an external processing terminal 302 (such as a computer), so as to realize real-time monitoring of the hydrogen sulfide content and changes in the artificial core model 200. At the same time, in some examples, the number of the hydrogen sulfide probes corresponds to the number of measurement intervals 201. The arrangement of the hydrogen sulfide probes in the artificial core model 200 with a double-layer structure is used as an example for explanation. A hydrogen sulfide probe (hereinafter referred to as the probe) is set based on the measurement interval 201. Specifically, two probes are provided in a single measurement interval 201. For the convenience of description, the two probes are respectively recorded as a first probe and a second probe. At this time, one end of the first probe is inserted into the upper layer of the artificial core model 200 from the upper center position of the measurement interval 201 in a vertical direction, and the other end extends from the upper side of the artificial core model 200. One end of the second probe is inserted into the lower layer of the artificial core model 200 from the lower center position of the measurement interval 201 in a vertical direction, and the other end extends from the lower side of the artificial core model 200. By arranging the probes in the artificial core model 200 in this way, the content and changes of hydrogen sulfide in the artificial core model 200 can be monitored in real time, the spatial distribution of hydrogen sulfide in the artificial core model 200 can be obtained, and a cloud map of the hydrogen sulfide content distribution can be further obtained by methods such as interpolation.

[0053] Reference Figure 1 , 4, 5 and 6, the above-mentioned experimental device also includes a tube body component 400, which is a hollow structure, that is, a gas channel is formed inside the tube body component 400, and the gas channel is connected to the subsequent injection and production component 500, and the gas (such as natural gas or sour natural gas) in the gas channel is supplied and output through the injection and production component 500. In some embodiments, the tube body component 400 includes an inner tube component 401 and an outer tube component 402, wherein the outer tube component 402 is sleeved on the inner tube component 40 1, and the inner tube member 401 and the outer tube member 402 are configured to be relatively rotatable. Further, the side wall of the inner tube member 401 is provided with an inner outlet group 403, and the side wall of the outer tube member 402 is provided with an outer outlet group 404. During the relative rotation of the inner tube member 401 and the outer tube member 402, the positions of some of the inner outlets constituting the inner outlet group 403 and the outer outlets constituting the outer outlet group 404 overlap, so that the gas channel in the tube member 401 and the artificial core model 20 0 model is connected at this position, so as to realize the injection and production operation of gas (such as natural gas). In some examples, multiple inner outlets constituting the inner outlet group 403 are arranged at intervals along the axial direction of the inner tube component 401, and the number and position of the inner outlets correspond to the number and position of the layers in the artificial core model 200 model. Correspondingly, the outer outlet group 404 is composed of multiple outer outlet units distributed at axial intervals, and a single outer outlet unit is composed of at least one outer outlet. When a single outer outlet unit is composed of multiple outer outlets, the multiple outer outlets constituting the outer outlet unit are distributed at intervals along the axial direction, and the outer outlets of different outer outlet units and the inner outlets of the inner outlet group 403 have different corresponding relationships, that is, the positions and / or numbers of the outer outlets of different outer outlet units are different, so as to realize the injection and production requirements of different combinations of multi-layer structures in the artificial core model 200 model. Exemplarily, the arrangement of the inner outlet group 403 and the outer outlet group 404 in the artificial core model 200 with a double-layer structure is taken as an example for explanation, with reference to Figure 5 and 6In this example, the inner outlet group 403 includes an inner outlet a and an inner outlet b. Correspondingly, the outer outlet group 404 is composed of three outer outlet units, one of which includes outer outlets A1 and B1 distributed in the axial direction, another outer outlet unit includes an outer outlet A2, and the last outer outlet unit includes an outer outlet B2, wherein the outer outlets B1 and B2 are located at the same cross-sectional position, and the outer outlets A1 and A2 are located at the same cross-sectional position. When the inner tube component 401 and the outer tube component 402 rotate to the inner outlet a and the inner outlet b respectively, the outer outlets A1 and A2 are located at the same cross-sectional position. After the positions of A1 and the outer outlet B1 coincide with each other, the gas channel in the tube body component 400 is connected to the upper and lower layers of the artificial core model 200. When the inner tube component 401 and the outer tube component 402 are rotated to coincide with the positions of the inner outlet a and the outer outlet A2, the gas channel in the tube body component 400 is connected to the upper layer of the artificial core model 200. When the inner tube component 401 and the outer tube component 402 are rotated to coincide with the positions of the inner outlet b and the outer outlet B2, the gas channel in the tube body component 400 is connected to the lower layer of the artificial core model 200.

[0054] In some examples, four of the above-mentioned tube body components 400 are provided and are respectively located at the four corners of the artificial core model 200. The multiple tube body components 400 can move synchronously, that is, the multiple tube body components 400 can perform gas injection or gas production operations synchronously. At the same time, the multiple tube body components 400 can also move independently, so as to realize multiple injection and production methods such as simultaneous injection and production, one injection and one production, or multiple injections and multiple productions, so as to be consistent with the injection and production methods of the real gas storage reservoir, so as to simulate the actual gas reservoir for hydrogen sulfide washing process. At the same time, when the tube body component 400 enters the artificial core model 200, it can choose to penetrate all layers of the artificial core model 200 to simulate the full perforation of the wellbore; it can also only perforate the upper layer of the artificial core model 200 to simulate the partial perforation of the wellbore, that is, it can simulate different wellbore perforation degrees according to actual needs.

[0055] Reference Figure 1 and 7The experimental device further includes an injection and production assembly 500. In some examples, the injection and production assembly 500 includes a first pipeline 501, the first pipeline 501 having a first section 502 and a second section 503, wherein the second section 503 is composed of at least two pipelines, and the plurality of pipelines have a dispersed end and a contact end, the dispersed ends of the plurality of pipelines extend independently and are connected to different gas supply parts (such as storage containers), and each pipeline is equipped with a valve to control the opening and closing of the pipeline, and the contact ends of the plurality of pipelines constituting the second section 503 are converged and connected to one end of the first section 502, that is, one end of the first section 502 is connected to the contact ends of the plurality of pipelines, and the other end of the first section 502 is connected to the outer end of the tubular body component 400 (that is, the end outside the artificial core model 200), and the first pipeline 501 is equipped with a pump body for driving the gas to flow on the first pipeline 501. For example, referring to Figure 7 The second section 503 has two pipelines, which are respectively recorded as a first supply line 504 and a second supply line 505, wherein the first supply line 504 is configured to supply pure natural gas to the artificial core model 200 model, and the second supply line 505 is configured to supply sulfur-containing natural gas to the artificial core model 200 model;

[0056] In some embodiments, the above-mentioned experimental device is provided with a pressure gauge 509 on the first section 502 of the first pipeline 501, which is used to measure the gas pressure in the artificial core model 200 model, and control the operation of the injection and production operation experiment based on the measured pressure (for example, controlling the opening and closing of the valve on the first pipeline 501 based on the pressure).

[0057] In some embodiments, reference Figure 7 The injection and collection assembly 500 further includes a second pipeline 507, one end of which is connected to the first section 502 of the first pipeline 501, and the other end of the second pipeline 507 is freely extended and connected to a gas recovery device 508, and the second pipeline 507 is equipped with auxiliary components such as a pump body and a valve, so that the second pipeline 507 can operate independently of the first pipeline 501 to achieve gas recovery and collection operations. In other embodiments, refer to Figure 7 The second pipeline 507 is also provided with a third detector 506 for detecting the concentration of hydrogen sulfide in the gas discharged from the exhaust pipeline, that is, simulating the concentration of hydrogen sulfide in the produced gas.

[0058] An experimental method for studying the hydrogen sulfide washing mechanism of sour gas reservoirs comprises the following steps:

[0059] Step S1, detecting the sealing performance of the artificial core model 200 to ensure that the sealing performance of the artificial core model 200 meets the requirements;

[0060] Step S2, placing the artificial core model 200 in the experimental area of ​​the container component 100, and evacuating the experimental area; specifically, evacuating the experimental area by a vacuum pump 101 connected to the experimental area;

[0061] Step S3: inject sulfur-containing natural gas into different layers in the artificial core model 200 based on experimental requirements, and stop injecting after the pressure in the artificial core model 200 reaches a first preset pressure.

[0062] Specifically, in this step, the injection requirements of different layers in the artificial core model 200 are selected based on the positional relationship between the inner outlet group 403 of the inner tube component 401 and the outer outlet group 404 on the outer tube component 402. After the positional relationship between the inner tube component 401 and the outer tube component 402 is determined, the valve on the second supply line 505 is opened, and the pump body on the first pipeline 501 is started. The sour natural gas flows through the first pipeline 501 into the artificial core model 200 under the action of the pump body. During the injection process, the pressure data in the artificial core model 200 is reflected in real time through the pressure gauge 509 on the first pipeline 501. When the pressure value in the artificial core model 200 reaches the first preset pressure, the valve and the pump body on the first pipeline 501 are closed to stop injecting the hydrogen sulfide-containing natural gas. In some examples, the first preset pressure is 2Mpa, which is used to simulate a depleted gas reservoir containing hydrogen sulfide natural gas before reservoir construction.

[0063] Step S4: leaving the artificial core model 200 to stand until the internal pressure remains stable, and recording the concentration of hydrogen sulfide in the artificial core model 200.

[0064] Specifically, in this step, the pressure data in the artificial core model 200 is displayed in real time through the pressure gauge 509 on the first pipeline 501. When the pressure value displayed by the pressure gauge 509 does not change or changes very little, it means that the internal pressure of the artificial core model 200 has reached equilibrium, that is, the internal pressure of the artificial core model 200 remains stable. At the same time, the determination of the hydrogen sulfide concentration in the artificial model is based on the hydrogen sulfide probes distributed in each detection interval in the artificial core model 200, and the hydrogen sulfide concentration data is recorded through the processing terminal 302.

[0065] Step S5, injecting natural gas into the artificial core model 200, and stopping the injection when the pressure in the artificial core model 200 reaches a second preset pressure, and monitoring and recording the hydrogen sulfide concentration data in the artificial core model 200 in real time during the injection process.

[0066] Specifically, in this step, natural gas is injected through the first supply line 504, that is, the pump body on the first pipeline 501 and the valve on the first supply line 504 are started accordingly, and the natural gas is supplied to the artificial core model 200 by the first supply line 504, and the injection is stopped when the pressure in the artificial core model 200 (obtained by the pressure gauge 509) reaches a second preset pressure. The second preset pressure is exemplarily 3Mpa, and this set pressure can ensure the progress of the experiment under the premise of meeting safety requirements.

[0067] Step S6: Allow the artificial core model 200 to stand until the internal pressure remains stable before extracting gas, and monitor the concentration of hydrogen sulfide in the artificial core model 200 in real time during the gas extraction process.

[0068] Specifically, in this step, the gas production process is performed based on the second pipeline 507, that is, the pump body and the valve on the second pipeline 507 are opened, and accordingly, the gas in the artificial core model 200 enters the gas recovery device 508 from the second pipeline 507 for collection.

[0069] Step S7, repeating steps S3-S7, and monitoring the change of the hydrogen sulfide concentration in the artificial core model 200 in real time.

[0070] In some embodiments, the collected and recorded hydrogen sulfide concentration data may be selectively further processed, such as performing difference processing on the hydrogen sulfide concentration data and assigning different colors to different hydrogen sulfide concentrations to obtain a distribution map of hydrogen sulfide concentration in the artificial core model 200.

[0071] Furthermore, through the final repetitive step, the actual production process of the gas storage reservoir can be simulated as a cyclic reciprocating injection and production process; illustratively, according to numerical simulation research, it is predicted that the concentration of hydrogen sulfide can be reduced from 20g / m3 to 1.5g / m3 after about ten cycles, and the concentration of hydrogen sulfide changes very little after about fifteen cycles of hydrogen sulfide washing. The injection and production cycle can be reasonably adjusted according to the experimental results, that is, the number of repetitions in the repeated steps. If the concentration of hydrogen sulfide is already very low and the concentration of hydrogen sulfide does not change significantly with the cyclic injection and production, the washing process can be stopped to obtain the experimental results. In some embodiments of the present invention, the number of repetitions of step S6 and step S7 is set to four to seven times, and the hydrogen sulfide concentration can be washed to be less than 1mg / m3.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An experimental device for studying the mechanism of hydrogen sulfide washing in sour gas reservoirs, characterized in that: include: an artificial core model configured to simulate a natural gas reservoir structure; at least one collection element, one end of which is configured to be able to enter the artificial core model and to collect hydrogen sulfide concentration data; At least one tubular member, one end of which is configured to enter the artificial core model, the tubular member comprising an inner tube member and an outer tube member which are relatively rotatable, the inner tube member being provided with an inner outlet group, the outer tube member being provided with an outer outlet group, and the positional relationship between the inner outlet group and the outer outlet group changing based on the rotation between the inner tube member and the outer tube member; The injection and production assembly is fluidically connected to the artificial core model through the tubular body component.

2. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 1, characterized in that: The plurality of inner outlets constituting the inner outlet group are distributed at intervals along the axial direction of the tube body component.

3. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 1, characterized in that: The outer outlet group includes at least two outer outlet units spaced apart in the circumferential direction of the tube body component, and the outer outlet constituting a single outer outlet unit is arranged along the axial direction of the tube body component.

4. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 1, characterized in that: The artificial core model includes at least a double-layer core structure in the vertical direction, and different layers of reservoir structures have at least different permeabilities and / or porosities.

5. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 1, characterized in that: The artificial core model is divided into a plurality of detection intervals in the horizontal direction, and the acquisition elements are arranged based on the detection intervals.

6. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 1, characterized in that: The injection and production assembly comprises a first pipeline, and the first pipeline comprises: A first section, one end of which is connected to the tube member; The second section includes at least two pipelines with a dispersed end and a contact end. The dispersed ends of the multiple pipelines extend independently and are each provided with a valve. The contact ends of the multiple pipelines are each connected to the first section.

7. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 6, characterized in that: The injection and production assembly also includes: A second pipeline, one end of which is connected to the first section, and the other end of which is provided with a gas recovery device, and a pump body and a valve are provided on the second pipeline.

8. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 6, characterized in that: A pressure gauge is provided on the first section.

9. The experimental device for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 1, characterized in that: The experimental device also includes a container component, and a vacuum-drawable experimental area is defined in the container component and can accommodate the artificial core model.

10. An experimental method for studying the mechanism of hydrogen sulfide washing in sour gas reservoirs, characterized in that: The method is carried out based on the experimental device described in any one of claims 1 to 9, and the method comprises: placing the artificial core model in an experimental space in the container component, and evacuating the experimental space; injecting sour natural gas into different layers in the artificial core model based on experimental requirements, and stopping the injection after the pressure in the artificial core model reaches a first preset pressure; The artificial core model is left to stand until the internal pressure remains stable, and the concentration of hydrogen sulfide in the artificial core model is recorded; Injecting natural gas into the artificial core model, and stopping the injection when the pressure in the artificial core model reaches a second preset pressure, and monitoring and recording the hydrogen sulfide concentration data in the artificial core model in real time during the injection process; The artificial core model is left to stand until the internal pressure remains stable before gas extraction is carried out, and the concentration of hydrogen sulfide in the artificial core model is monitored in real time during the gas extraction process.

11. The experimental method for studying the hydrogen sulfide washing mechanism of sour gas reservoirs according to claim 10, characterized in that: The injection of different layers in the artificial core model is selected based on the positional relationship between the inner outlet group in the inner tube component and the outer outlet group in the outer tube component.

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