Analog simulation device for rebuilding gas storage in different types of oil reservoirs and storage capacity determination method

Abstract

The invention discloses an analogue simulation device for different types of oil reservoir reconstruction gas reservoirs and a reservoir capacity determination method. The analogue simulation device comprises a high-precision pump, an intermediate container, a high-temperature and high-pressure long core holder, an inlet gas-liquid metering and separating device, an outlet gas-liquid metering and separating device and a master controller, the main controller is respectively connected with the high-precision pump, the intermediate container, the high-temperature and high-pressure long core holder, the inlet gas-liquid metering and separating device and the outlet gas-liquid metering and separating device; the high-precision pump is communicated with the intermediate container through a conveying pipeline, and the intermediate container is communicated with the high-temperature and high-pressure long core holder through a conveying pipeline; the inlet gas-liquid metering and separating device is arranged at an inlet of the high-temperature and high-pressure core holder, and the outlet gas-liquid metering and separating device is arranged at an outlet of the high-temperature and high-pressure core holder. The device has the advantages and positive effects of improving the construction efficiency of the gas storage, enhancing the oil and gas exploitation efficiency, enhancing the experiment safety, improving the experiment precision, visualizing the experiment data and the like.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas development, and in particular to a simulation device for reconstructing gas storage reservoirs of different types of oil reservoirs and a method for determining storage capacity. Background Art

[0002] At present, the technical level of oil and gas field development in my country is constantly improving, and certain results have been achieved in oil field development, but at the same time, more problems and challenges are also faced. Under the international background of tight supply of world oil energy, the strategic position of natural gas in national economic development is becoming increasingly prominent, and some oil fields in my country also have sufficient natural gas energy. If only crude oil is mined without natural gas recovery or reuse, a large amount of natural gas resources will be wasted and lost. The establishment of gas storage is used to solve the problem of natural gas storage and seasonal peak regulation.

[0003] In the implementation cases of gas storage at home and abroad, oil and gas reservoirs are basically the main transformation objects, among which gas reservoirs are the focus. There are especially few cases of transformation of oil reservoirs in China. In the process of water-driven oil reservoir development, water cone advance is often produced. When the oil reservoir is converted into a gas storage, due to the participation of injected gas, the fluid flow in the underground porous medium will become oil-gas-water three-phase seepage. In addition, the high-speed repeated injection and production of gas makes this oil-gas-water three-phase seepage under high temperature and high pressure more complicated. Before converting the oil reservoir into a gas storage, it is very necessary to clarify the analysis of fluid seepage law and reservoir expansion capacity during repeated injection and production, which is an important basis for formulating implementation plans. At present, my country's oil reservoir conversion into gas storage is still in its infancy. There are few public reports on the simulation and evaluation methods of seepage simulation experiments for oil reservoir conversion into gas storage. The existing simulation devices for oil reservoir conversion into gas storage cannot effectively simulate the whole process of converting different types of oil reservoirs into gas storage and the process of converting different types of reservoirs; at the same time, the efficiency of building gas storage models is low.

[0004] Through the above analysis, the problems and defects of the existing technology are: the existing simulation device for converting oil reservoirs into gas storage reservoirs cannot effectively simulate the whole process of converting oil reservoirs into gas storage reservoirs and the process of converting different types of reservoirs.

[0005] Based on this, the existing technology still needs to be improved. Summary of the invention

[0006] To solve the above technical problems, the embodiments of the present invention propose a simulation device for converting different types of oil reservoirs into gas storage facilities and a storage capacity determination method to solve the technical problem that the existing technology cannot effectively simulate the entire process of converting oil reservoirs into gas storage facilities and the reconstruction process of different types of reservoirs.

[0007] To solve the above technical problems, on the one hand, some embodiments of the present invention disclose a simulation device for reconstructing gas storage reservoirs of different types of oil reservoirs, including a high-precision pump, an intermediate container, a high-temperature and high-pressure long core holder, an inlet gas-liquid metering and separation device, an outlet gas-liquid metering and separation device and a main controller;

[0008] Wherein, the main controller is respectively connected to the high precision pump, the intermediate container, the high temperature and high pressure long core holder, the inlet gas-liquid metering and separation device and the outlet gas-liquid metering and separation device;

[0009] The high-precision pump is connected to the intermediate container through a delivery pipeline, and the intermediate container is connected to the high-temperature and high-pressure long core clamp through a delivery pipeline; the inlet gas-liquid metering and separation device is arranged at the inlet of the high-temperature and high-pressure core clamp, and the outlet gas-liquid metering and separation device is arranged at the outlet of the high-temperature and high-pressure core clamp.

[0010] In some embodiments, a back-pressure valve is provided between the high-temperature and high-pressure core holder and the outlet gas-liquid metering and separation device, and the main controller is connected to the back-pressure valve.

[0011] In some embodiments, the high temperature and high pressure core holder holds a core.

[0012] In some embodiments, the main controller includes a temperature detection module, an experimental data statistics module, an experimental data processing module, a gas storage capacity determination module and a display module;

[0013] The temperature detection module detects the temperature of the core and sends it to the experimental data processing module;

[0014] The experimental data statistics module counts the experimental data, removes invalid experimental data, and builds an experimental database;

[0015] The experimental data processing module classifies the experimental data through a classification program, analyzes the experimental data through an analysis program, evaluates the experimental data through an evaluation program, and simulates the experimental data through a numerical simulation program;

[0016] The gas storage capacity determination module obtains the gas storage capacity based on the processing result of the experimental data processing module.

[0017] In some embodiments, the experimental data includes pressure, flow rate, and temperature of the medium.

[0018] In some embodiments, the gas storage capacity determination module is based on the formula:

[0019]

[0020] Get the gas storage capacity;

[0021] Among them, the G k is the storage capacity of the gas storage converted from the oil reservoir at pressure p, in m 3 or mL;

[0022] The N p is the cumulative oil production on the ground, in t or mL;

[0023] The B o is the volume coefficient of formation crude oil at pressure p;

[0024] The B w is the volume coefficient of formation water at pressure p;

[0025] The W p is the cumulative surface water production, in m 3 (mL under laboratory conditions);

[0026] The W i is the cumulative water injection volume on the ground, in m 3 (mL under laboratory conditions);

[0027] The W e It is the cumulative natural water intrusion, which should be considered in core experiments and practical applications. The unit is m 3 (mL under laboratory conditions);

[0028] B oi For p i Volume coefficient of formation crude oil under pressure;

[0029] The S wi is the formation bound water saturation;

[0030] The C w is the compressibility coefficient of formation water, MPa -1 ;

[0031] The C f is the effective compression coefficient of the formation rock, MPa -1 ;

[0032] The Δp is the formation pressure drop (p i -p), MPa;

[0033] B ig is the volume coefficient of the injected gas at pressure p;

[0034] The N is the original geological reserves of crude oil.

[0035] On the other hand, an embodiment of the present invention further discloses a method for determining the storage capacity of a gas storage facility converted from an oil reservoir, which is obtained by conducting experiments using the aforementioned simulation devices for converting different types of oil reservoirs into gas storage facilities.

[0036] In some embodiments, the high-precision pump extracts formation water or natural gas and delivers it to an intermediate container through a delivery pipe for standby use;

[0037] The intermediate container transports formation water or natural gas through the delivery pipe to the core held by the high-temperature and high-pressure long core holder to conduct experiments and obtain relevant experimental data;

[0038] The gas storage capacity is obtained through the gas storage capacity determination module.

[0039] In some embodiments, the intermediate container transports formation water or natural gas through a delivery pipe to a core held by a high-temperature and high-pressure long core holder for experiments, and the relevant experimental data obtained include:

[0040] Gas measurement of long core permeability; preparation of simulated formation water for experiment to achieve formation water salinity; preparation of live oil that meets the PVT properties of underground crude oil using crude oil and associated gas from oil fields; establishment of bound water saturation and calculation of liquid measurement pore volume using weighing method;

[0041] For the long core gas flooding experiment, the gas-oil ratio, recovery factor, reservoir capacity and the final oil-gas relative permeability curve at each time are calculated based on the cumulative oil and gas production recorded at different times of the experiment;

[0042] For the long core water drive followed by gas drive experiment, a long core water drive oil experiment was carried out and the experimental data were recorded; after water drive until no oil was produced, a long core gas drive oil experiment was carried out and the experimental data were recorded; according to the cumulative water, oil and gas production recorded at different times of the experiment, the gas-oil ratio, recovery factor, reservoir capacity and the final oil-gas relative permeability curve at each time were calculated;

[0043] For the long core multi-cycle gas-to-oil drive experiment, the gas-to-oil ratio, recovery factor, relative injectivity, reservoir capacity and the final oil-gas relative permeability curve of each cycle are calculated based on the recorded oil and gas output at the inlet and outlet of each cycle.

[0044] In some embodiments, for a long core multi-cycle gas-to-oil drive experiment, one cycle includes: after the inlet is injected with gas to a specified pressure, the inlet gas-liquid metering and separation device and the outlet gas-liquid metering and separation device are opened simultaneously to measure the amount of gas and liquid at the inlet and outlet, respectively; when the oil output from the outlet reaches a predetermined recovery level, the inlet and outlet are closed, and the inlet is re-injected with gas to a specified pressure and then stabilized for a period of time.

[0045] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0046] The present invention provides a simulation device for converting different types of oil reservoirs into gas storage facilities and a method for determining storage capacity, which have the advantages and positive effects of improving the efficiency of gas storage construction, enhancing oil and gas production efficiency, enhancing experimental safety, improving experimental accuracy and visualizing experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A structural block diagram of a simulation device for converting different types of oil reservoirs into gas storage facilities disclosed in some embodiments of the present invention;

[0049] Figure 2 A flow chart of a method for determining the storage capacity of a gas storage facility converted from an oil reservoir disclosed in some embodiments of the present invention;

[0050] Figure 3 The present invention is a processing flow chart of an experimental data processing module of a method for determining the storage capacity of a gas storage reservoir converted from an oil reservoir disclosed in some embodiments of the present invention.

[0051] Description of reference numerals:

[0052] 1. High-precision pump; 2. Intermediate container; 3. High-temperature and high-pressure long core holder; 4. Inlet gas-liquid metering and separation device; 5. Main controller; 6. Back pressure valve; 7. Outlet gas-liquid metering and separation device. DETAILED DESCRIPTION

[0053] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0054] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0055] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0056] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0057] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0058] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0059] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0060] like Figure 1As shown, some embodiments of the present invention disclose a simulation device for reconstructing gas storage reservoirs of different types of oil reservoirs, including a high-precision pump, an intermediate container, a high-temperature and high-pressure long core clamp, an inlet gas-liquid metering and separation device, an outlet gas-liquid metering and separation device and a main controller; wherein the main controller is respectively connected to the high-precision pump, the intermediate container, the high-temperature and high-pressure long core clamp, the inlet gas-liquid metering and separation device and the outlet gas-liquid metering and separation device; the high-precision pump is connected to the intermediate container through a delivery pipeline, and the intermediate container is connected to the high-temperature and high-pressure long core clamp through a delivery pipeline; the inlet gas-liquid metering and separation device is arranged at the inlet of the high-temperature and high-pressure core clamp, and the outlet gas-liquid metering and separation device is arranged at the outlet of the high-temperature and high-pressure core clamp. wherein a core is clamped in the high-temperature and high-pressure core clamp.

[0061] In this embodiment, formation water or natural gas is extracted by a high precision pump and transported to an intermediate container through a delivery pipe; a high temperature and high pressure long core clamp clamps the core; the intermediate container transports formation water or natural gas to the core through a delivery pipe; a long core gas drive experiment, a long core water drive followed by a gas drive experiment, and a long core multi-cycle gas drive experiment (i.e., simulating three different types of reservoirs, namely, pure oil reservoirs, high water content reservoirs, and gas storage reservoirs developed in a gas storage reservoir mode) can be carried out; for the long core multi-cycle gas drive experiment, when the inlet is injected with gas to a specified pressure, the gas inlet is injected with gas to a specified pressure, and the gas inlet is injected with gas to a specified pressure. After that, open the inlet gas-liquid metering separation device and the outlet gas-liquid metering separation device at the same time to measure the amount of gas and liquid at the inlet and outlet respectively. When the oil output from the outlet or the total amount of oil output from the inlet and outlet reaches the predetermined production level, close the inlet and outlet, and re-inject gas into the inlet to stabilize for a period of time. This is one cycle. Repeating this operation later is multiple cycles. The advantage of this is that it simulates the repeated injection and production and peak regulation process of converting an actual oil reservoir into a gas storage facility, which can improve the oil reservoir recovery rate while gradually converting the oil reservoir into a gas storage facility.

[0062] The simulation devices for converting different types of oil reservoirs into gas storage facilities disclosed in some embodiments of the present invention are, on the basis of the above embodiments, a back-pressure valve is provided between the high-temperature and high-pressure core clamp and the outlet gas-liquid metering and separation device in order to better regulate the pressure of the gas in the core pores, and the main controller is connected to the back-pressure valve.

[0063] The simulation device for converting different types of oil reservoirs into gas storage facilities disclosed in some embodiments of the present invention is based on the above embodiments, wherein the main controller includes a temperature detection module, an experimental data statistics module, an experimental data processing module, a gas storage capacity determination module and a display module;

[0064] The temperature detection module detects the temperature of the core and sends it to the experimental data processing module;

[0065] The experimental data statistics module counts the experimental data, clears invalid experimental data, and builds an experimental database; the experimental data includes pressure, flow rate, and temperature of the medium;

[0066] The experimental data processing module classifies the experimental data through a classification program, analyzes the experimental data through an analysis program, evaluates the experimental data through an evaluation program, and simulates the experimental data through a numerical simulation program;

[0067] The gas storage capacity determination module obtains the gas storage capacity based on the processing result of the experimental data processing module.

[0068] The gas storage capacity determination module can be based on the formula:

[0069]

[0070] Get the gas storage capacity;

[0071] Among them, the G k is the storage capacity of the gas storage converted from the oil reservoir at pressure p, in m 3 or mL;

[0072] The N p is the cumulative oil production on the ground, in t or mL;

[0073] B o is the volume coefficient of formation crude oil at pressure p;

[0074] B w is the volume coefficient of formation water at pressure p;

[0075] The W p is the cumulative surface water production, in m 3 (mL under laboratory conditions);

[0076] The W i is the cumulative water injection volume on the ground, in m 3 (mL under laboratory conditions);

[0077] The W e It is the cumulative natural water intrusion, which should be considered in core experiments and practical applications. The unit is m 3 (mL under laboratory conditions);

[0078] B oi For p i Volume coefficient of formation crude oil under pressure;

[0079] The S wi is the formation bound water saturation;

[0080] The Cw is the compressibility coefficient of formation water, MPa -1 ;

[0081] The C f is the effective compression coefficient of the formation rock, MPa -1 ;

[0082] The Δp is the formation pressure drop (p i -p), MPa;

[0083] B ig is the volume coefficient of the injected gas at pressure p;

[0084] The N is the original geological reserves of crude oil.

[0085] Some embodiments of the present invention disclose a simulation device for converting different types of oil reservoirs into gas storage reservoirs, such as Figure 1 As shown, it includes: a high-precision pump, an intermediate container, a high-temperature and high-pressure long core holder, an inlet gas-liquid metering and separation device, a main controller, a back pressure valve, and an outlet gas-liquid metering and separation device; the right side of the high-precision pump is connected to the intermediate container through a delivery pipe; the right side of the intermediate container is connected to the high-temperature and high-pressure long core holder through a delivery pipe; the lower left side of the high-temperature and high-pressure long core holder is connected to the back pressure valve through a delivery pipe; the right side of the back pressure valve is connected to the inlet gas-liquid metering and separation device through a delivery pipe; the right side of the high-temperature and high-pressure long core holder is connected to the back pressure valve through a delivery pipe; the right side of the back pressure valve is connected to the outlet gas-liquid metering and separation device through a delivery pipe; the main controller is respectively connected to the high-precision pump, the intermediate container, the high-temperature and high-pressure long core holder, the inlet gas-liquid metering and separation device, the back pressure valve, and the outlet gas-liquid metering and separation device through circuit lines;

[0086] The main controller includes a temperature detection module, an experimental data statistics module, an experimental data processing module, a gas storage capacity determination module, and a display module.

[0087] The temperature detection module is used to detect the core temperature; the temperature detection module detection method: automatically detect the core temperature through an intelligent temperature detection device, and send the detected core temperature to the experimental data processing module through a wired method;

[0088] The experimental data statistics module is used to count the data of the long core gas drive experiment, the long core water drive followed by gas drive experiment and the long core multi-cycle gas drive experiment (i.e., simulating three different types of reservoirs converted into gas storages, namely, pure reservoirs, high water content reservoirs and reservoirs developed in the gas storage mode); the statistical method of the experimental data statistics module is: statistically analyzing the experimental data through a statistical program, removing invalid experimental data, and constructing an experimental database; storing the statistical long core gas drive experiment, long core water drive followed by gas drive experiment and long core multi-cycle gas drive experiment data in the experimental database;

[0089] The experimental data processing module is used to process the data of the long core gas drive experiment, the long core water drive followed by gas drive experiment and the long core multi-cycle gas drive experiment; the processing method of the experimental data processing module is: classifying the experimental data through a classification program; analyzing the experimental data through an analysis program; and evaluating the experimental data through an evaluation program;

[0090] The gas storage capacity determination module is used to determine the capacity of the gas storage for oil reservoir reconstruction.

[0091] The display module is used to display the data of long core gas drive oil experiment, long core water drive followed by gas drive experiment and long core multi-cycle gas drive oil experiment, and gas storage capacity.

[0092] Among them, the main controller can have the following functions:

[0093] Control function: The main controller can connect various components through circuit lines to realize the control of the device; the main controller can control the operation of the high-precision pump, intermediate container, high-temperature and high-pressure long core holder, back pressure valve, inlet gas-liquid metering and separation device and outlet gas-liquid metering and separation device, as well as control the medium transportation, metering and separation process;

[0094] Monitoring function: The main controller can monitor the operating status of the device and the working conditions of each component; the main controller can monitor the pressure, flow, temperature and other parameters of the medium in real time, and adjust and optimize the device according to the monitoring results;

[0095] Data processing function: The main controller can process and analyze the collected data to extract useful information; the main controller can store the data in the internal memory, or transmit it to an external computer through the network for further processing and analysis;

[0096] Alarm function: The main controller can send out an alarm signal when an abnormality or failure occurs in the device to remind the operator to deal with the problem in time; the main controller can monitor the working status of each component according to the preset threshold value. When it exceeds the preset range, the main controller will automatically send out an alarm signal.

[0097] Some embodiments of the present invention also disclose a method for determining the storage capacity of a gas storage facility converted from an oil reservoir, such as Figure 2 , Figure 3 As shown, the results were obtained by conducting experiments using the aforementioned simulation devices for converting different types of oil reservoirs into gas storage facilities.

[0098] Specifically, the steps include:

[0099] Step 1: A high-precision pump extracts formation water or natural gas and delivers it to an intermediate container through a delivery pipe for standby use; a high-temperature and high-pressure long core holder is used to clamp the core; the intermediate container delivers formation water or natural gas to the core through a delivery pipe;

[0100] Step 2, taking the long core multi-cycle gas-to-oil drive experiment as an example, when the inlet is injected with gas to the specified pressure, the inlet gas-liquid metering and separation device and the outlet gas-liquid metering and separation device are opened at the same time, and the amount of gas and liquid at the inlet and outlet are measured respectively. When the oil output from the outlet or the total amount of oil output from the inlet and outlet reaches the predetermined recovery degree, the inlet and outlet are closed, and the inlet is injected with gas again to the specified pressure and stabilized for a period of time. This is one cycle, and repeating this operation later is multiple cycles;

[0101] Step three, detecting the core temperature through the temperature detection module; statistically analyzing the data of the long core gas drive experiment, the long core water drive followed by gas drive experiment, and the long core multi-cycle gas drive experiment through the experimental data statistics module; processing the data of the long core gas drive experiment, the long core water drive followed by gas drive experiment, and the long core multi-cycle gas drive experiment through the experimental data processing module;

[0102] The temperature detection module detection method: automatically detects the core temperature through an intelligent temperature detection device, and sends the detected core temperature to the experimental data processing module through a wired method;

[0103] The statistical method of the experimental data statistical module: statistically analyze the experimental data through a statistical program, remove invalid experimental data, and construct an experimental database; store the statistical long core gas drive oil experiment, long core water drive followed by gas drive experiment, and long core multi-cycle gas drive oil experiment data in the experimental database;

[0104] The experimental data processing module processing method: classify the experimental data through a classification program; analyze the experimental data through an analysis program; evaluate the experimental data through an evaluation program; simulate the experimental data through a numerical simulation program;

[0105] Step 4, determining the capacity of the gas storage converted from the oil reservoir through the gas storage capacity determination module;

[0106] The method for determining the capacity of the gas storage facility converted from an oil reservoir is as follows:

[0107]

[0108] Get the gas storage capacity;

[0109] Among them, the G k is the storage capacity of the gas storage converted from the oil reservoir at pressure p, in m 3 or mL;

[0110] The N p is the cumulative oil production on the ground, in t or mL;

[0111] B o is the volume coefficient of formation crude oil at pressure p;

[0112] The B w is the volume coefficient of formation water at pressure p;

[0113] The W p is the cumulative surface water production, in m 3 (mL under laboratory conditions);

[0114] The W i is the cumulative water injection volume on the ground, in m 3 (mL under laboratory conditions);

[0115] The W e It is the cumulative natural water intrusion, which should be considered in core experiments and practical applications. The unit is m 3 (mL under laboratory conditions);

[0116] The B oi For p i Volume coefficient of formation crude oil under pressure;

[0117] The S wi is the formation bound water saturation;

[0118] The C w is the compressibility coefficient of formation water, MPa -1 ;

[0119] The C f is the effective compression coefficient of the formation rock, MPa -1 ;

[0120] The Δp is the formation pressure drop (p i -p), MPa;

[0121] The B ig is the volume coefficient of the injected gas at pressure p;

[0122] The N is the original geological reserves of crude oil.

[0123] Step 5: Display the data of the long core gas drive oil experiment, the long core water drive followed by gas drive experiment, the long core multi-cycle gas drive oil experiment, and the gas storage capacity through the display module.

[0124] The experimental data processing module processing method includes:

[0125] (1) For the long core gas flooding experiment, the gas-oil ratio, recovery factor, reservoir capacity and the final oil-gas relative permeability curve at each time are calculated based on the cumulative oil and gas production recorded at different times of the experiment;

[0126] Long core gas flooding experiment:

[0127] Gas measurement of long core permeability; preparation of simulated formation water for experiment to achieve formation water mineralization;

[0128] Use the produced crude oil and associated gas from the oil field to prepare live oil that meets the PVT properties of the underground crude oil;

[0129] Establish irreducible water saturation and calculate liquid-measured pore volume using the weighing method;

[0130] Conduct long core gas-to-oil drive experiments and record experimental data;

[0131] (2) For the long core water flooding followed by gas flooding experiment, the gas-oil ratio, recovery factor, reservoir capacity and the final oil-gas relative permeability curve at each time were calculated based on the cumulative water, oil and gas production recorded at different times of the experiment;

[0132] Long core water flooding followed by gas flooding experiment:

[0133] Gas measurement of long core permeability; preparation of simulated formation water for experiment to achieve formation water mineralization;

[0134] Use the produced crude oil and associated gas from the oil field to prepare live oil that meets the PVT properties of the underground crude oil;

[0135] Establish irreducible water saturation and calculate liquid-measured pore volume using the weighing method;

[0136] Conduct long core water flooding experiments and record experimental data;

[0137] After water flooding until no oil is produced, a long core gas flooding experiment is carried out and the experimental data are recorded;

[0138] (3) For the long core multi-cycle gas-to-oil drive experiment, the gas-to-oil ratio, recovery factor, relative injectivity, reservoir capacity and the final oil-gas relative permeability curve of each cycle were calculated based on the recorded oil and gas output at the inlet and outlet of each cycle.

[0139] (4) Finally, the data is analyzed to guide the implementation of the on-site plan.

[0140] The embodiment of the present invention discloses a simulation device for converting different types of oil reservoirs into gas storage reservoirs and a storage capacity determination method. Formation water or natural gas is extracted by a high-precision pump and transported to an intermediate container through a delivery pipe; a high-temperature and high-pressure long core clamp clamps the core; the intermediate container transports formation water or natural gas to the core through a delivery pipe; for a long core gas drive oil experiment, a gas drive oil experiment is performed at a constant gas injection rate; for a long core water drive followed by gas drive experiment, water drive oil is performed at a constant water injection rate, and when oil is no longer discharged from the outlet, gas drive oil is performed at a constant gas injection rate; for In the long core multi-cycle gas-to-oil drive experiment, after the inlet is injected with gas to the specified pressure, the inlet gas-liquid metering separation device and the outlet gas-liquid metering separation device are opened at the same time to measure the amount of gas and liquid at the inlet and outlet respectively. When the oil output from the outlet reaches the predetermined production level, the inlet and outlet are closed, and the inlet is re-injected with gas to the specified pressure and then stabilized for a period of time. This is one cycle. Repeating this operation is multiple cycles. The advantage of this is that it simulates the repeated injection and production and peak regulation process of converting an actual oil reservoir into a gas storage facility. While improving the oil reservoir recovery rate, the oil reservoir can also be gradually converted into a gas storage facility.

[0141] The invention can be used to conduct long core gas drive oil experiment, long core water drive followed by gas drive experiment and long core multi-cycle gas drive oil experiment, that is, to simulate the process of reconstructing gas storage reservoirs of different types of oil reservoirs, thereby improving the experimental efficiency; and the experimental data statistics module and the experimental data processing module can be used to perform real-time statistics and processing on the experimental data, so as to determine the parameters and storage capacity of each process of reconstructing gas storage reservoirs of different types of oil reservoirs, thereby helping to improve the construction efficiency of gas storage reservoirs and reduce the construction cost.

[0142] The present invention can more accurately understand the capacity and storage characteristics of the gas storage reservoir, thereby improving the efficiency and economic benefits of oil and gas production.

[0143] The present invention controls and monitors the experimental process through the main controller, and can timely discover and solve problems that may occur in the experiment, thereby enhancing the safety of the experiment.

[0144] The components of the invention, such as the high-precision pump and the back-pressure valve, can ensure the stability and accuracy of the flow and pressure of the gas and liquid in the experiment, thereby improving the accuracy and reliability of the experiment.

[0145] The display module included in the present invention can intuitively display the experimental data in the form of graphics, tables, etc., making it convenient for users to perform data analysis and decision-making.

[0146] In summary, it has the advantages and positive effects of improving the efficiency of gas storage construction, enhancing the efficiency of oil and gas production, enhancing experimental safety, improving experimental accuracy and experimental data visualization.

[0147] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0148] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A simulation device for converting different types of oil reservoirs into gas storage facilities, characterized in that: It includes a high-precision pump, an intermediate container, a high-temperature and high-pressure long core holder, an inlet gas-liquid metering and separation device, an outlet gas-liquid metering and separation device and a main controller; Wherein, the main controller is respectively connected to the high precision pump, the intermediate container, the high temperature and high pressure long core holder, the inlet gas-liquid metering and separation device and the outlet gas-liquid metering and separation device; The high-precision pump is connected to the intermediate container through a delivery pipeline, and the intermediate container is connected to the high-temperature and high-pressure long core clamp through a delivery pipeline; the inlet gas-liquid metering and separation device is arranged at the inlet of the high-temperature and high-pressure core clamp, and the outlet gas-liquid metering and separation device is arranged at the outlet of the high-temperature and high-pressure core clamp.

2. The simulation device for converting different types of oil reservoirs into gas storage facilities according to claim 1 is characterized in that: A back pressure valve is provided between the high temperature and high pressure core clamp and the outlet gas-liquid metering and separation device, and the main controller is connected to the back pressure valve.

3. The simulation device for converting different types of oil reservoirs into gas storage facilities according to claim 1, characterized in that: A core is clamped in the high-temperature and high-pressure core clamp.

4. The simulation device for converting different types of oil reservoirs into gas storage facilities according to claim 3 is characterized in that: The main controller includes a temperature detection module, an experimental data statistics module, an experimental data processing module, a gas storage capacity determination module and a display module; The temperature detection module detects the temperature of the core and sends it to the experimental data processing module; The experimental data statistics module counts the experimental data, removes invalid experimental data, and builds an experimental database; The experimental data processing module classifies the experimental data through a classification program, analyzes the experimental data through an analysis program, evaluates the experimental data through an evaluation program, and simulates the experimental data through a numerical simulation program; The gas storage capacity determination module obtains the gas storage capacity based on the processing result of the experimental data processing module.

5. The simulation device for converting different types of oil reservoirs into gas storage facilities according to claim 4 is characterized in that: The experimental data include pressure, flow rate and temperature of the medium.

6. The simulation device for converting different types of oil reservoirs into gas storage facilities according to claim 4, characterized in that: The gas storage capacity determination module is based on the formula: Get the gas storage capacity; Among them, the G k is the storage capacity of the gas storage converted from the oil reservoir at pressure p, in m 3 or mL; The N p is the cumulative oil production on the ground, in t or mL; The B o is the volume coefficient of formation crude oil at pressure p; The B w is the volume coefficient of formation water at pressure p; The W p is the cumulative surface water production, in m 3 Or mL; The W i is the cumulative water injection volume on the ground, in m 3 or mL; The W e It is the cumulative natural water intrusion, which should be considered in core experiments and practical applications. The unit is m 3 or mL; The B oi For p i Volume coefficient of formation crude oil under pressure; The S wi is the formation bound water saturation; The C w is the compressibility coefficient of formation water, MPa -1 ; The C f is the effective compression coefficient of the formation rock, MPa -1 ; The Δp is the formation pressure drop (p i -p), MPa; The B ig is the volume coefficient of the injected gas at pressure p; The N is the original geological reserves of crude oil.

7. A method for determining the storage capacity of a gas storage facility converted from an oil reservoir, characterized in that: The method is obtained by conducting experiments using the simulation device for converting different types of oil reservoirs into gas storage facilities as described in claims 1-6.

8. The determination method according to claim 7, characterized in that: The high-precision pump extracts formation water or natural gas and transports it to the intermediate container through the transmission pipe for standby; The intermediate container transports formation water or natural gas through the delivery pipe to the core held by the high-temperature and high-pressure long core holder to conduct experiments and obtain relevant experimental data; The gas storage capacity is obtained through the gas storage capacity determination module.

9. The determination method according to claim 8, characterized in that: The intermediate container transports formation water or natural gas through the transmission pipe to the core held by the high-temperature and high-pressure long core holder for experiments. The relevant experimental data obtained include: Gas measurement of long core permeability; preparation of simulated formation water for experiment to achieve formation water salinity; preparation of live oil that meets the PVT properties of underground crude oil using crude oil and associated gas from oil fields; establishment of bound water saturation and calculation of liquid measurement pore volume using weighing method; For the long core gas flooding experiment, the gas-oil ratio, recovery factor, reservoir capacity and the final oil-gas relative permeability curve at each time are calculated based on the cumulative oil and gas production recorded at different times of the experiment; For the long core water drive followed by gas drive experiment, a long core water drive oil experiment was carried out and the experimental data were recorded; after water drive until no oil was produced, a long core gas drive oil experiment was carried out and the experimental data were recorded; according to the cumulative water, oil and gas production recorded at different times of the experiment, the gas-oil ratio, recovery factor, reservoir capacity and the final oil-gas relative permeability curve at each time were calculated; For the long core multi-cycle gas-to-oil drive experiment, the gas-to-oil ratio, recovery factor, relative injectivity, reservoir capacity and the final oil-gas relative permeability curve of each cycle are calculated based on the recorded oil and gas output at the inlet and outlet of each cycle.

10. The determination method according to claim 9, characterized in that: For the long core multi-cycle gas-to-oil drive experiment, one cycle includes: when the inlet is injected with gas to the specified pressure, the inlet gas-liquid metering and separation device and the outlet gas-liquid metering and separation device are opened at the same time to measure the amount of gas and liquid at the inlet and outlet respectively; when the oil output from the outlet reaches the predetermined recovery level, the inlet and outlet are closed, and the inlet is re-injected with gas to the specified pressure and then stabilized for a period of time.

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