Method for determining extent of damage to SAGD steam chamber caused by water invasion in edge-water oil reservoir, and apparatus

Abstract

Disclosed in the present disclosure are a method for determining an extent of damage to an SAGD steam chamber caused by water invasion in an edge-water oil reservoir, and an apparatus, which can be used in the field of oil production and development in oil fields. The method comprises: on the basis of data changes in a steam chamber respectively corresponding to different injection-production ratios and different water invasion rates during injection of room temperature water into the steam chamber, respectively determining results of impact of water invasion amounts and water invasion rates on the temperature of the steam chamber during water invasion; by means of an oil reservoir water invasion numerical simulation model, determining a maximum damage volume of the steam chamber and a water invasion pressure difference inflection point during water invasion; further determining an association relationship between water invasion data of an edge-water oil reservoir and the extent of damage to an SAGD steam chamber; and acquiring water invasion data to be determined, and, on the basis of the water invasion data to be determined and the association relationship between the water invasion data of the edge-water oil reservoir and the extent of damage to the SAGD steam chamber, determining an extent of damage to the SAGD steam chamber caused by water invasion in the edge-water oil reservoir. The present disclosure can identify change patterns of the steam chamber damage volume during water invasion and causes therefor, and accurately identify affected temperature fields.

Description

Method and device for determining damage degree of steam chamber of SAGD caused by water invasion of edge water reservoir

[0001] Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411328932.9 filed on September 23, 2024, and incorporates by reference the entire disclosure of the above patent application as part of the present application. TECHNICAL FIELD

[0003] The present disclosure relates to the field of oilfield development, and particularly relates to a method and device for determining damage degree of steam chamber of SAGD caused by water invasion of edge water reservoir. BACKGROUND

[0004] This section is intended to provide background or context to the embodiments of the present disclosure. The description herein does not constitute an admission that the information provided herein is prior art.

[0005] SAGD (Steam Assist Gravity Drainage) development technology is a frontier technology for developing super heavy oil. Its recovery mechanism is to inject high dryness steam into the injection well, the steam overlaps in the formation to form a steam chamber, the steam chamber expands upward and laterally, exchanges heat with the crude oil in the oil layer, and the heated and reduced viscosity crude oil and steam condensate water are discharged to the lower horizontal production well by gravity, and the steam chamber continues to expand and occupy the volume of the crude oil.

[0006] When the steam chamber develops too fast, once it reaches the edge and communicates with the edge water, it will cause the edge water to invade the inside of the reservoir, the reservoir will be damaged, and the remaining oil in the reservoir will be mixed into a huge water body to form countless small oil droplets and cannot be produced again. Therefore, it is particularly important to judge the damage degree of steam chamber water invasion, but the current related research is not mature, mostly focusing on machine learning to screen injection and production parameters, predict water breakthrough time and evaluate water invasion volume, the factors are relatively single, and it is not applicable to super heavy oil reservoirs. SUMMARY

[0007] The embodiments of the present disclosure provide a method for determining damage degree of steam chamber of SAGD caused by water invasion of edge water reservoir, which is used to identify the change rule and reason of the steam chamber damage volume in the water invasion process, and accurately identify the influence of temperature field. The method comprises:

[0008] According to the data changes in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the reservoir water invasion experimental model, the influence of water invasion volume and water invasion rate on the temperature of the steam chamber in the water invasion process is determined respectively. The reservoir water invasion experimental model is used to simulate the change of temperature field in the water invasion process and the temperature distribution at different positions in different stages of water invasion.

[0009] obtain reservoir well historical water invasion data, construct a reservoir water invasion numerical simulation model according to the reservoir well historical water invasion data, the reservoir water invasion numerical simulation model is used for simulating the damage change of the SAGD steam cavity in the water invasion process, and the maximum damage volume of the steam cavity in the water invasion process and the water invasion pressure difference inflection point are determined through the reservoir water invasion numerical simulation model;

[0010] According to the influence of the water invasion amount on the steam cavity temperature in the water invasion process, the influence of the water invasion rate on the steam cavity temperature, the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point, the correlation between the edge water reservoir water invasion data and the SAGD steam cavity damage degree is determined.

[0011] Obtain the water invasion data to be determined, and determine the damage degree of the SAGD steam cavity caused by the edge water reservoir water invasion according to the water invasion data to be determined and the correlation between the edge water reservoir water invasion data and the SAGD steam cavity damage degree.

[0012] The embodiment of the present disclosure also provides a device for determining the damage degree of the SAGD steam cavity caused by the edge water reservoir water invasion, which is used to deepen the understanding of the water invasion mechanism and accurately identify the influence on the temperature field. The device comprises:

[0013] The water invasion simulation module is used for determining the influence of the water invasion amount and the water invasion rate on the steam cavity temperature in the water invasion process according to the data change in the steam cavity corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam cavity of the reservoir water invasion experimental model, and the reservoir water invasion experimental model is used for simulating the temperature field change in the water invasion process and the temperature distribution at different positions in different stages of the water invasion.

[0014] The numerical simulation module is used for obtaining reservoir well historical water invasion data, constructing a reservoir water invasion numerical simulation model according to the reservoir well historical water invasion data, and simulating the damage change of the SAGD steam cavity in the water invasion process through the reservoir water invasion numerical simulation model, and determining the maximum damage volume of the steam cavity in the water invasion process and the water invasion pressure difference inflection point through the reservoir water invasion numerical simulation model.

[0015] The correlation confirmation module is used for determining the correlation between the edge water reservoir water invasion data and the SAGD steam cavity damage degree according to the influence of the water invasion amount on the steam cavity temperature in the water invasion process, the influence of the water invasion rate on the steam cavity temperature, the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point.

[0016] The water invasion damage determination module is used for obtaining the water invasion data to be determined, and determining the damage degree of the SAGD steam cavity caused by the edge water reservoir water invasion according to the water invasion data to be determined and the correlation between the edge water reservoir water invasion data and the SAGD steam cavity damage degree.

[0017] The embodiment of the present disclosure further provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity when executing the computer program.

[0018] The embodiment of the present disclosure further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity.

[0019] The embodiment of the present disclosure further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity.

[0020] In the embodiment of the present disclosure, according to the data changes in the steam cavity corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam cavity of the reservoir water invasion experimental model, the influence of the water invasion amount and the water invasion rate on the temperature of the steam cavity in the water invasion process is determined respectively, the reservoir water invasion experimental model is used to simulate the temperature field changes in the water invasion process and the temperature distribution at different positions in different stages of the water invasion; the historical water invasion data of the reservoir well is obtained, and a reservoir water invasion numerical simulation model is constructed according to the historical water invasion data of the reservoir well, the reservoir water invasion numerical simulation model is used to simulate the damage changes of the SAGD steam cavity in the water invasion process, and the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point in the water invasion process are determined through the reservoir water invasion numerical simulation model; according to the influence of the water invasion amount on the temperature of the steam cavity, the influence of the water invasion rate on the temperature of the steam cavity, the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point, the correlation between the edge water reservoir water invasion data and the damage degree of the SAGD steam cavity is determined; the to-be-determined water invasion data is obtained, and the damage degree of the edge water reservoir water invasion to the SAGD steam cavity is determined according to the to-be-determined water invasion data and the correlation between the edge water reservoir water invasion data and the damage degree of the SAGD steam cavity. In this way, by finely describing the temperature field changes in the water invasion process and the temperature distribution at different positions in different stages of the water invasion, the temperature field is accurately evaluated, the physical simulation of the influence of different water invasion rates on the steam cavity is carried out, the change of the invasion rate and the change of the damage degree of the steam cavity after the water invasion causes damage to the steam cavity are analyzed, the water invasion damage mechanism is revealed, the reasonable operation limit of the SAGD in the middle-deep edge top and bottom water reservoir is established, the safe reservoir is taken as a prerequisite, the crude oil resources in the reservoir which are not effectively exploited are further mined, and the oil recovery rate is improved, for example, including but not limited to SAGD development of different horizons such as Guantao, Dongying, Shayi and the like. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In the drawings:

[0022] Fig. 1 is a flow chart of a method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity provided in the embodiments of the present disclosure;

[0023] Fig. 2 is a schematic diagram of the internal structure of a model provided in the embodiments of the present disclosure;

[0024] Fig. 3 is a flow chart of an experiment provided in the embodiments of the present disclosure;

[0025] Fig. 4 is a temperature field variation cloud chart during water invasion (i.e. temperature distribution chart of temperature measuring points at different positions of the model under different water invasion amounts) provided in the embodiments of the present disclosure;

[0026] Fig. 5 is a temperature distribution chart of temperature measuring points at different positions of the model at different times provided in the embodiments of the present disclosure;

[0027] Fig. 6 is a temperature field chart at the initial stage of water invasion provided in the embodiments of the present disclosure;

[0028] Fig. 7 is a temperature distribution chart at different positions at the initial stage of water invasion provided in the embodiments of the present disclosure;

[0029] Fig. 8 is a dryness distribution chart at different positions at the late stage of water invasion provided in the embodiments of the present disclosure;

[0030] Fig. 9 is a temperature variation curve of the model measuring points under different water invasion rates (steam rate 30 ml / min) provided in the embodiments of the present disclosure;

[0031] Fig. 10 is a steam dryness profile chart at different stages of water invasion provided in the embodiments of the present disclosure;

[0032] Fig. 11 is a steam cavity damage volume variation curve during water invasion provided in the embodiments of the present disclosure;

[0033] Fig. 12 is a steam cavity damage volume variation curve under different water invasion pressure differences provided in the embodiments of the present disclosure;

[0034] Fig. 13 is a temperature profile chart of steam cavity at different stages provided in the embodiments of the present disclosure;

[0035] Fig. 14 is a schematic diagram of a device for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity provided in the embodiments of the present disclosure;

[0036] Fig. 15 is a structural block diagram of an electronic device provided in the embodiments of the present disclosure. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the embodiments of the present disclosure are described in further detail below with reference to the drawings. Herein, the illustrative embodiments of the present disclosure and the descriptions thereof are used to explain the present disclosure but are not as limitations on the present disclosure.

[0038] The term "and / or" used herein is merely descriptive, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" used herein means any one of multiple or any combination of at least two of multiple, for example, including at least one of A, B and C can mean including any one or more elements selected from the set consisting of A, B and C.

[0039] In the description of the present specification, "comprise", "include", "have", "contain" and the like are all open terms, which means to include but not limited to. The description of the terms "one embodiment", "one specific embodiment", "some embodiments", "for example" and the like means that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. The order of steps involved in the embodiments is used to illustrate the embodiments of the present application, and the order of steps is not limited, which can be appropriately adjusted as needed.

[0040] A target oil layer (i.e. an exemplary target oil layer) has been fully formed by SAGD steam cavity, but the development is uneven, and the distance from the local edge water is less than 30m, with a great risk of water invasion. The study of temperature difference thermodynamics shows that when the water invasion volume is only 10% of the steam cavity volume, the steam cavity temperature will decrease from 260℃ to 165℃, and the pressure will decrease from 5MPa to below 1MPa, which will cause the steam cavity to be destroyed and the SAGD to lose its production capacity. How to prevent the edge water invasion from causing economic losses to the oilfield is one of the more difficult problems in oilfield development. Through indoor physical simulation and numerical simulation research, the influencing factors of edge water invasion in edge water reservoirs can be objectively and realistically studied, the edge water invasion law, oil well production dynamic law and remaining oil distribution law of edge water reservoirs can be obtained, and the corresponding edge water reservoir treatment measures can be explored.

[0041] In order to prolong the development of the super heavy oil reservoir with top water SAGD production period, weaken the influence caused by the reservoir heterogeneity and the uneven use of steam soak before SAGD development mode, prevent the steam cavity from rapidly expanding to the edge of the reservoir in a single direction, if the steam cavity is communicated with the edge water, the edge water will invade, once the huge edge water body flows into the reservoir, the SAGD development will be terminated, and a large amount of remaining oil in the reservoir cannot be produced, which is a great waste of resources.

[0042] Based on this, the embodiment of the present disclosure provides a method for determining the damage degree of edge water reservoir water invasion to SAGD steam cavity, as shown in FIG. 1, comprising:

[0043] Step 101: According to the data changes in the steam cavity corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam cavity of the reservoir water invasion experimental model, the influence of water invasion amount and water invasion rate on the temperature of the steam cavity in the water invasion process is determined respectively, and the reservoir water invasion experimental model is used to simulate the temperature field change in the water invasion process and the temperature distribution at different positions in different stages of water invasion;

[0044] Step 102: Obtain the historical water invasion data of the reservoir well, and construct a reservoir water invasion numerical simulation model according to the historical water invasion data of the reservoir well, the reservoir water invasion numerical simulation model is used to simulate the damage change of the SAGD steam cavity in the water invasion process, and the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point in the water invasion process are determined by the reservoir water invasion numerical simulation model;

[0045] Step 103: According to the influence of water invasion amount on the temperature of the steam cavity, the influence of water invasion rate on the temperature of the steam cavity, the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point, the correlation between the edge water reservoir water invasion data and the damage degree of SAGD steam cavity is determined;

[0046] Step 104: Obtain the water invasion data to be determined, and determine the damage degree of edge water reservoir water invasion to SAGD steam cavity according to the correlation between the water invasion data to be determined and the edge water reservoir water invasion data and the damage degree of SAGD steam cavity.

[0047] The method for determining the damage degree of edge water reservoir water invasion to SAGD steam cavity provided by the embodiment of the present disclosure can deepen the understanding of the water invasion mechanism by constructing an experimental model for experiment and numerical simulation, predict the risk of edge water invasion in SAGD development, carry out the evaluation research on the damage degree of water invasion to the steam cavity, reveal the water invasion damage mechanism, and facilitate the establishment of reasonable operation limits for SAGD in medium-deep edge-top / bottom water reservoirs, so as to ensure the safety of the reservoir as a prerequisite and further tap the potential of SAGD development.

[0048] In some exemplary embodiments, the method for determining the degree of damage of water invasion of edge water reservoir to SAGD steam cavity proposed by the embodiments of the present disclosure can be applied in the development of super heavy oil. For example, the method can be executed by a processor, for example, the processor can obtain data and process the data, for example, the processor can obtain the data change in the steam cavity and determine the influence of the water invasion amount and the water invasion rate on the temperature of the steam cavity during the water invasion process; the processor can obtain the historical water invasion data of the reservoir well; the processor can determine the correlation between the water invasion data of the edge water reservoir and the degree of damage of the SAGD steam cavity, and obtain the to-be-determined water invasion data, and determine the degree of damage of the water invasion of the edge water reservoir to the SAGD steam cavity according to the correlation between the to-be-determined water invasion data and the water invasion data of the edge water reservoir and the degree of damage of the SAGD steam cavity, and the like.

[0049] For example, the reservoir water invasion experimental model can be pre-constructed and stored in the processor. The historical water invasion data of the reservoir well can be obtained from the oilfield production database. The temperature data and pressure data in the steam cavity can be obtained by using temperature sensors, pressure sensors and the like to obtain the data change in the steam cavity.

[0050] For example, before step 101, the simulated core is also placed in the reservoir water invasion experimental model.

[0051] In an embodiment, before determining the influence of the water invasion amount and the water invasion rate on the temperature of the steam cavity during the water invasion process, respectively, the method further comprises:

[0052] During the process of controlling the injection of room temperature water into the steam cavity according to different injection-production ratios and different water invasion rates until the damage of the steam cavity reaches the preset standard, the data change in the steam cavity is continuously monitored and recorded.

[0053] In specific implementation, as the SAGD production and development of the target oil layer proceed, the distance to the edge water becomes closer and closer, and the risk of water invasion is extremely high. Water invasion is a dynamic mass (mass transfer) and energy (heat transfer) exchange process. Due to the heat carrying capacity of steam, the first phase (dryness) changes and the temperature does not change, and then the saturated water and the unsaturated water are mixed and the temperature finally decreases. The actual monitoring data of well temperature and numerical simulation technology are used to finely describe the temperature field change and the temperature distribution at different positions in different stages of the water invasion process, and the water invasion mechanism is deepened to accurately evaluate the influence on the temperature field.

[0054] The physical simulation of the influence of different water invasion rates on the steam cavity is carried out, the relationship chart between the water invasion rate and the injection-production ratio and the temperature of the steam cavity is established, and after analyzing the damage of the water invasion to the steam cavity, the change of the invasion rate and the change of the damage degree of the steam cavity are analyzed.

[0055] The numerical simulation model of SAGD typical well group in heavy oil reservoir is established, and on the basis of fine history matching, the variation law and reason of steam chamber damage volume in the process of edge water invasion under different pressure differentials are studied.

[0056] In an embodiment, the room temperature water is injected into the steam chamber according to different injection-production ratios until the steam chamber damage reaches a preset standard, including:

[0057] The room temperature water is injected into the steam chamber according to the initial injection-production ratio;

[0058] The injection-production ratio is controlled to increase in a preset manner until the steam chamber damage reaches the preset standard.

[0059] In an embodiment, it further includes:

[0060] After the room temperature water is injected into the steam chamber according to the initial injection-production ratio, if the steam chamber damage reaches the preset standard, the water injection is controlled to stop;

[0061] The injection-production ratio is controlled to decrease in a preset manner, and the data changes in the steam chamber are continuously monitored and recorded.

[0062] In an embodiment, the room temperature water is injected into the steam chamber according to different water invasion rates until the steam chamber damage reaches a preset standard, including:

[0063] The room temperature water is injected into the steam chamber according to the initial water invasion rate;

[0064] The water invasion rate is controlled to increase in a preset manner until the steam chamber damage reaches the preset standard.

[0065] In an embodiment, the data changes in the steam chamber include the data changes of each temperature measuring point and pressure measuring point in the steam chamber;

[0066] According to the data changes in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the reservoir water invasion experimental model, the influence results of the water invasion amount and the water invasion rate on the steam chamber temperature in the water invasion process are determined, including:

[0067] According to the data changes of each temperature measuring point and pressure measuring point in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the reservoir water invasion experimental model, the influence results of the water invasion amount and the water invasion rate on the steam chamber temperature in the water invasion process are determined.

[0068] In an embodiment, it further includes:

[0069] Before continuously monitoring and recording data changes in the steam chamber, the control continues to inject steam into the water invasion experimental model until all temperature measuring points in the water invasion experimental model reach the preset temperature; the production rate of the water invasion experimental model is measured, and the injection-production balance of the water invasion experimental model is maintained.

[0070] In an embodiment, the maximum steam chamber damage volume and the water invasion pressure difference inflection point in the water invasion process are determined by the water invasion numerical simulation model, comprising:

[0071] The water invasion data of the oil reservoir well history is fitted by the water invasion numerical simulation model;

[0072] The steam dryness profile in different periods is determined according to the fitting result, and the steam chamber damage volume change in the water invasion process is determined according to the steam dryness profile in different periods, so as to obtain the maximum steam chamber damage volume in the water invasion process;

[0073] According to the steam chamber damage volume change in the water invasion process, the water invasion pressure difference inflection point in the water invasion process is determined under the condition that the water invasion rate is constant.

[0074] For example, for the risk of edge water invasion in SAGD development of Guantao Formation in Du 84 block of Liaohe Oilfield, the damage degree of water invasion to the steam chamber is evaluated, the development risk is warned, the prevention and control plan is prepared in advance, and the technical support for the orderly replacement of SAGD million tons in Liaohe Oilfield is provided. The technical scheme adopted by the method includes:

[0075] 1. Select air injection oxidation zone simulation tubular experimental device (end face model), effective sand filling space φ4.5x40cm, maximum temperature of injected medium 1000℃, heating temperature of heat preservation sleeve ≤150℃, maximum working pressure 20MPa, which meets the experimental requirements of water invasion damage degree evaluation of steam chamber.

[0076] Two pairs of 14 column temperature measuring points are arranged in the effective sand filling space, the temperature measuring point spacing is 3cm, and the temperature collection period is 2S / time; 5 groups of pressure measuring points are arranged, which are uniformly distributed in the 40cm axial direction, and the pressure measuring points have temperature, pressure and simulation injection functions, and can be adjusted to the water invasion position. The specific arrangement is shown in Figure 2. In some embodiments, temperature sensors can be used to collect temperature, pressure sensors can be used to collect pressure data, and flow meters can be used to obtain fluid flow rate data.

[0077] (1) Establish experimental model

[0078] The related design parameters of the experimental model are shown in Table 1.

[0079] Table 1 Experimental model design parameter table

[0080] (2) Experimental implementation process

[0081] ①Establishment of steam chamber: continuously inject steam for 2 hours until all temperature measuring points of the model are higher than 264℃, and meanwhile measure the rate of produced liquid (to ensure injection-production balance);

[0082] ②Simulation of different water invasion rates:

[0083] Inject room temperature water in the middle of the model with an injection-production ratio of 0.05 (corresponding to an injection rate of 1.5 ml / min), and observe the data changes of the temperature measuring points and pressure measuring points (experimental time: 30 min); gradually increase the injection-production ratio until the water invasion causes obvious damage to the steam chamber.

[0084] ③If the injection-production ratio of 0.05 (corresponding to an injection rate of 1.5 ml / min) has caused damage to the steam chamber, stop water injection, and repeat process 1 until the temperature is above 264℃, and gradually reduce the injection-production ratio to 0.03 (corresponding to an injection rate of 0.9 ml / min) and 0.01 (corresponding to an injection rate of 0.3 ml / min).

[0085] The specific experimental procedure is shown in FIG. 3.

[0086] 2. Analyze the temperature field changes in the water invasion process, and the results are shown in FIGS. 4-5. The two figures are the temperature change graphs in the water invasion process (i.e., temperature distribution graphs under different water invasion amounts) provided in the embodiments of the present disclosure, and it can be seen that, in the physical simulation process, after the water invades into the steam chamber, the temperature far from the invasion point is obviously reduced first, and with the gradual increase of the injection amount, the temperature gradually decreases, the area continuously expands, and approaches the invasion point. The reason for this phenomenon is that the water invasion is a dynamic mass (mass transfer) and energy (heat transfer) exchange process. Due to the heat carrying capacity of steam, the phase (dryness) changes first and the temperature does not change, as shown in FIGS. 6-7; then the saturated water mixes with the unsaturated water and the final temperature decreases, as shown in FIG. 8. That is, the water invasion amount affects the dryness when the amount is small, and the temperature when the amount is large.

[0087] 3. Carry out physical simulation of the influence of different water invasion rates on the steam chamber, and gradually increase the water invasion rate (from 7 ml / min). When the water invasion rate is lower than 12 ml / min, the temperature of the steam chamber does not change; when the water invasion rate is higher than 17 ml / min, the temperature of the steam chamber decreases in a shock mode. The temperature change curves of the model measuring points under different water invasion rates are shown in FIG. 9.

[0088] 4. Establish a numerical simulation model of a typical well group of a heavy oil reservoir SAGD, and on the basis of fine history matching, study the damage change law of the steam chamber in the process of edge water invasion. The steam dryness profiles at different periods are shown in FIG. 10, and the steam chamber damage volume change curve in the process of water invasion is shown in FIG. 11. The numerical simulation research shows that in the process of edge water invasion, the damage range to the steam chamber is gradually expanded in the form of a "funnel", and finally a single point breaks through to the production horizontal well, and the steam chamber damage volume reaches the maximum value.

[0089] As shown in Figure 12, under the condition of constant water invasion rate, the water invasion pressure difference inflection point is near 0.3-0.4 MPa, and with the increase of water invasion pressure difference, the water invasion steam cavity damage volume increases dramatically.

[0090] As shown in Figure 13, the damage mode of edge water invasion to the steam cavity is mainly loss of steam dryness, and only the temperature near the invasion point decreases obviously.

[0091] The research results show that:

[0092] ①The damage mode of edge water invasion to the steam cavity is mainly loss of steam dryness, and only the temperature near the invasion point decreases obviously, and with the gradual increase of injection volume, the temperature gradually decreases and the area gradually expands.

[0093] ②During the edge water invasion process, the damage range to the steam cavity is gradually expanded in the form of "funnel", and finally a single point breaks through to the production horizontal well, and the steam cavity damage volume reaches the maximum value.

[0094] ③When the edge water breaks through to the horizontal well, the total damage volume of the steam cavity increases with the increase of pressure difference, and the water invasion pressure difference inflection point is near 0.3-0.4 MPa.

[0095] The method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity provided in the embodiments of the present disclosure provides that in the deep SAGD development process, the basic characteristics of water invasion are determined, mainly the water invasion is a dynamic mass (mass transfer) and energy (heat transfer) exchange process, due to the heat carrying capacity of steam, the phase (dryness) changes first and the temperature does not change, and then the saturated water and the unsaturated water are mixed and the temperature finally decreases. That is, the water invasion volume affects the dryness, and the temperature is affected by the volume; the physical simulation of the influence of different water invasion rates on the steam cavity is carried out, the relationship chart of water invasion speed (injection-production ratio) and steam cavity shrinkage degree is established, the change of the invasion rate and the change of the damage degree of the steam cavity after the water invasion causes damage to the steam cavity is analyzed; the numerical simulation model of the typical well group of the heavy oil reservoir SAGD is established, on the basis of fine history matching, the change rule and reason of the steam cavity damage volume during the edge water invasion process under different pressure difference conditions are studied. The water invasion damage mechanism is revealed, the reasonable operation limit of the SAGD of the medium-deep edge top and bottom water reservoir is established, the oil resources in the reservoir which are not effectively exploited are further excavated on the premise of ensuring the safety of the reservoir, and the oilfield recovery efficiency is improved.

[0096] In the embodiments of the present disclosure, a device for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity is also provided, as follows. Since the principle of the device for solving the problem is similar to that of the method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity, the implementation of the device can be referred to the implementation of the method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity, and the repeated parts will not be described herein.

[0097] FIG. 14 is a schematic diagram of a device for determining the damage degree of water invasion of edge water reservoirs to SAGD steam cavities provided in an embodiment of the present disclosure, as shown in FIG. 14, the device comprises:

[0098] a water invasion simulation module 1401 configured to determine the influence of water invasion amount and water invasion rate on the temperature of the steam cavity in the water invasion process, respectively, according to the data changes in the steam cavity corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam cavity of the water invasion experimental model of the reservoir, the water invasion experimental model of the reservoir being configured to simulate the temperature field changes in the water invasion process and the temperature distribution at different positions in different stages of the water invasion;

[0099] a numerical simulation module 1402 configured to obtain historical water invasion data of the reservoir well, and construct a numerical simulation model of the reservoir water invasion according to the historical water invasion data of the reservoir well, the numerical simulation model of the reservoir water invasion being configured to simulate the damage changes of the SAGD steam cavity in the water invasion process, and determine the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point in the water invasion process through the numerical simulation model of the reservoir water invasion;

[0100] a correlation relationship confirmation module 1403 configured to determine the correlation relationship between the water invasion data of the edge water reservoir and the damage degree of the SAGD steam cavity according to the influence of the water invasion amount on the temperature of the steam cavity, the influence of the water invasion rate on the temperature of the steam cavity, the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point;

[0101] a water invasion damage determination module 1404 configured to obtain to-be-determined water invasion data, and determine the damage degree of the edge water reservoir water invasion to the SAGD steam cavity according to the to-be-determined water invasion data and the correlation relationship between the water invasion data of the edge water reservoir and the damage degree of the SAGD steam cavity.

[0102] In an embodiment, the device further comprises a steam cavity construction module, specifically configured to:

[0103] In the process of controlling the injection of room temperature water into the steam cavity according to different injection-production ratios and different water invasion rates, respectively, until the damage of the steam cavity reaches a preset standard, the data changes in the steam cavity are continuously monitored and recorded.

[0104] In an embodiment, the water invasion simulation module 1401 is specifically configured to:

[0105] inject room temperature water into the steam cavity according to the initial injection-production ratio;

[0106] control the injection-production ratio to increase in a preset manner until the damage of the steam cavity reaches the preset standard.

[0107] In an embodiment, the water invasion simulation module 1401 is further configured to:

[0108] after injecting room temperature water into the steam cavity according to the initial injection-production ratio, if the damage of the steam cavity reaches the preset standard, control to stop water injection;

[0109] controlling the reduction of the injection-production ratio in a preset manner, and continuously monitoring and recording the data changes in the steam chamber.

[0110] In an embodiment, the water invasion simulation module 1401 is specifically configured to:

[0111] controlling the injection of room temperature water into the steam chamber according to the initial water invasion rate;

[0112] controlling the increase of the water invasion rate in a preset manner until the steam chamber damage reaches the preset standard.

[0113] In an embodiment, the data changes in the steam chamber include data changes of each temperature measuring point and pressure measuring point in the steam chamber;

[0114] The water invasion simulation module 1401 is specifically configured to:

[0115] According to the data changes of each temperature measuring point and pressure measuring point in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the water invasion experimental model of the oil reservoir, the influence of the water invasion amount and the water invasion rate on the steam chamber temperature during the water invasion process is determined respectively.

[0116] In an embodiment, the steam chamber construction module is specifically configured to:

[0117] Before continuously monitoring and recording the data changes in the steam chamber, continuously injecting steam into the water invasion experimental model of the oil reservoir until all temperature measuring points in the water invasion experimental model of the oil reservoir reach the preset temperature; measuring the production rate of the produced fluid of the water invasion experimental model of the oil reservoir, and keeping the injection-production balance of the water invasion experimental model of the oil reservoir.

[0118] In an embodiment, the numerical simulation module 1402 is specifically configured to:

[0119] fitting the historical water invasion data of the oil reservoir well through the numerical simulation model of the water invasion of the oil reservoir;

[0120] determining the steam dryness profile at different periods according to the fitting result, determining the steam chamber damage volume change during the water invasion process according to the steam dryness profile at different periods, and obtaining the maximum steam chamber damage volume during the water invasion process;

[0121] According to the steam chamber damage volume change during the water invasion process, the water invasion pressure difference inflection point during the water invasion process is determined under the condition that the water invasion rate is constant.

[0122] By way of example, the device for determining the damage degree of edge water reservoir water invasion to SAGD steam chamber can include a processor and at least one memory, the memory including computer program instructions executed by the processor, the instructions being used to execute the method for determining the damage degree of edge water reservoir water invasion to SAGD steam chamber.

[0123] The determination device can further include a temperature sensor and a pressure sensor. Specifically, the temperature sensor and the pressure sensor, and the flow meter can be used to obtain the temperature data, the pressure data, and the flow rate data in the steam chamber, so as to obtain the data change in the steam chamber.

[0124] Based on the foregoing inventive concept, the disclosure further provides a computer device 1500 as shown in FIG. 15, which includes a memory 1510, a processor 1520, and a computer program 1530 stored in the memory 1510 and executable on the processor 1520. When the processor 1520 executes the computer program 1530, the determination method of the damage degree of water invasion of the edge water reservoir to the SAGD steam chamber is implemented.

[0125] The disclosure further provides a computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, the determination method of the damage degree of water invasion of the edge water reservoir to the SAGD steam chamber is implemented.

[0126] The disclosure further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the determination method of the damage degree of water invasion of the edge water reservoir to the SAGD steam chamber is implemented.

[0127] In summary, the embodiment of the present disclosure further provides a computer program product, which comprises a computer program. When the computer program is executed by a processor, the computer program implements the method for determining the damage degree of water invasion of edge water reservoir to SAGD steam cavity. In the embodiment of the present disclosure, the influence of the water invasion amount and the water invasion rate on the temperature of the steam cavity in the water invasion process is determined respectively according to the data changes in the steam cavity corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam cavity of the water invasion experimental model. The water invasion experimental model is used to simulate the temperature field changes in the water invasion process and the temperature distribution at different positions in different stages of the water invasion. The historical water invasion data of the reservoir well is obtained, and a numerical simulation model of the reservoir water invasion is constructed according to the historical water invasion data of the reservoir well. The numerical simulation model of the reservoir water invasion is used to simulate the damage changes of the SAGD steam cavity in the water invasion process, and the maximum damage volume of the steam cavity and the water invasion pressure difference inflection point in the water invasion process are determined through the numerical simulation model of the reservoir water invasion. The correlation between the water invasion data of the edge water reservoir and the damage degree of the SAGD steam cavity is determined according to the influence of the water invasion amount on the temperature of the steam cavity, the influence of the water invasion rate on the temperature of the steam cavity, the maximum damage volume of the steam cavity, and the water invasion pressure difference inflection point. The damage degree of the SAGD steam cavity caused by the water invasion of the edge water reservoir is determined according to the to-be-determined water invasion data and the correlation between the water invasion data of the edge water reservoir and the damage degree of the SAGD steam cavity. In this way, by finely describing the temperature field changes in the water invasion process and the temperature distribution at different positions in different stages of the water invasion, the influence on the temperature field is accurately evaluated, the physical simulation of the influence of different water invasion rates on the steam cavity is carried out, the change of the invasion rate and the change of the damage degree of the steam cavity after the water invasion causes damage to the steam cavity are analyzed, the water invasion damage mechanism is revealed, the reasonable operation limit of the SAGD in the middle-deep edge top and bottom water reservoir is established, and the development potential of the Guantao SAGD is further tapped on the premise of ensuring the safety of the reservoir.

[0128] Those skilled in the art will understand that the embodiments of the present disclosure can be provided as methods, systems, or computer program products. Therefore, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0129] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

[0130] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

[0132] The specific embodiments described above are examples for implementing the disclosure and the purposes of the disclosure, technical solutions and beneficial effects, and should be understood as merely used to define the scope of the disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the disclosure should be included in the scope of the disclosure.

Claims

1. A method for determining the degree of impairment of a steam chamber of a SAGD process by water invasion in a edge water reservoir, characterized in that, The method comprises the following steps: According to the data changes in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the water invasion experimental model of the oil reservoir, the influence of the water invasion amount and the water invasion rate on the temperature of the steam chamber during the water invasion process is determined respectively, and the water invasion experimental model of the oil reservoir is used to simulate the temperature field changes and the temperature distribution at different positions in different stages of the water invasion process. Obtain the historical water invasion data of the oil reservoir well, and construct an oil reservoir water invasion numerical simulation model according to the historical water invasion data of the oil reservoir well, wherein the oil reservoir water invasion numerical simulation model is used to simulate the damage changes of the SAGD steam chamber in the water invasion process, and the maximum damage volume of the steam chamber and the water invasion pressure difference inflection point in the water invasion process are determined by the oil reservoir water invasion numerical simulation model. According to the influence of the water invasion amount and the water invasion rate on the temperature of the steam chamber during the water invasion process, the maximum damage volume of the steam chamber and the water invasion pressure difference inflection point, the correlation between the water invasion data of the edge water oil reservoir and the damage degree of the SAGD steam chamber is determined. Obtain the to-be-judged water invasion data, and determine the damage degree of the SAGD steam chamber caused by the water invasion of the edge water oil reservoir according to the to-be-judged water invasion data and the correlation between the water invasion data of the edge water oil reservoir and the damage degree of the SAGD steam chamber.

2. The method of claim 1, wherein, Before determining the influence of the water invasion amount and the water invasion rate on the temperature of the steam chamber during the water invasion process, the method further comprises the following steps: During the process of injecting room temperature water into the steam chamber at different injection-production ratios and different water invasion rates until the damage of the steam chamber reaches the preset standard, the data changes in the steam chamber are continuously monitored and recorded.

3. The method of claim 2, wherein, Injecting room temperature water into the steam chamber at different injection-production ratios until the damage of the steam chamber reaches the preset standard comprises the following steps: Injecting room temperature water into the steam chamber according to the initial injection-production ratio; Controlling to increase the injection-production ratio in a preset manner until the damage of the steam chamber reaches the preset standard.

4. The method of claim 3, wherein, The method further comprises the following steps: After injecting room temperature water into the steam chamber according to the initial injection-production ratio, if the damage of the steam chamber reaches the preset standard, the water injection is stopped; Controlling to decrease the injection-production ratio in a preset manner, and continuously monitoring and recording the data changes in the steam chamber.

5. The method of claim 2, wherein, Injecting room temperature water into the steam chamber at different water invasion rates until the damage of the steam chamber reaches the preset standard comprises the following steps: Injecting room temperature water into the steam chamber according to the initial water invasion rate; Controlling to increase the water invasion rate in a preset manner until the damage of the steam chamber reaches the preset standard.

6. The method of claim 2, wherein, The data changes in the steam chamber include the data changes of each temperature measuring point and pressure measuring point in the steam chamber; According to the data changes in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the water invasion experimental model of the oil reservoir, the influence of the water invasion amount and the water invasion rate on the temperature of the steam chamber during the water invasion process is determined respectively, and the water invasion experimental model of the oil reservoir is used to simulate the temperature field changes and the temperature distribution at different positions in different stages of the water invasion process. The method further comprises the following steps:

7. The method of claim 2, wherein, ​ Before continuously monitoring and recording data changes in the steam chamber, the control continuously injects steam into the water invasion experimental model of the oil reservoir until all temperature measuring points in the water invasion experimental model of the oil reservoir reach the preset temperature; the production rate of the produced fluid of the water invasion experimental model of the oil reservoir is measured, and the injection-production balance of the water invasion experimental model of the oil reservoir is maintained.

8. The method of claim 1, wherein, The maximum steam chamber damage volume and the water invasion pressure difference inflection point in the water invasion process are determined through the numerical simulation model of the water invasion of the oil reservoir, including: The historical water invasion data of the oil reservoir well are fitted through the numerical simulation model of the water invasion of the oil reservoir; The steam dryness profile in different periods is determined according to the fitting result, the steam chamber damage volume change in the water invasion process is determined according to the steam dryness profile in different periods, and the maximum steam chamber damage volume in the water invasion process is obtained; The water invasion pressure difference inflection point in the water invasion process is determined under the condition that the water invasion rate is constant according to the steam chamber damage volume change in the water invasion process.

9. A device for determining the degree of impairment of a SAGD steam chamber by water invasion in a edge water reservoir, characterized in that, including: The water invasion simulation module is used for determining the influence of the water invasion amount and the water invasion rate on the temperature of the steam chamber respectively according to the data changes in the steam chamber corresponding to different injection-production ratios and different water invasion rates during the injection of room temperature water into the steam chamber of the water invasion experimental model of the oil reservoir, the water invasion experimental model of the oil reservoir being used for simulating the temperature field change in the water invasion process and the temperature distribution at different positions in different stages of the water invasion; The numerical simulation module is used for obtaining the historical water invasion data of the oil reservoir well, constructing the numerical simulation model of the water invasion of the oil reservoir according to the historical water invasion data of the oil reservoir well, the numerical simulation model of the water invasion of the oil reservoir being used for simulating the damage change of the SAGD steam chamber in the water invasion process, and determining the maximum steam chamber damage volume and the water invasion pressure difference inflection point in the water invasion process through the numerical simulation model of the water invasion of the oil reservoir; The correlation relationship confirmation module is used for determining the correlation relationship between the water invasion data of the edge water oil reservoir and the damage degree of the SAGD steam chamber according to the influence of the water invasion amount on the temperature of the steam chamber, the influence of the water invasion rate on the temperature of the steam chamber, the maximum steam chamber damage volume and the water invasion pressure difference inflection point; The water invasion damage determination module is used for obtaining the water invasion data to be determined, and determining the damage degree of the SAGD steam chamber caused by the water invasion of the edge water oil reservoir according to the water invasion data to be determined and the correlation relationship between the water invasion data of the edge water oil reservoir and the damage degree of the SAGD steam chamber.

10. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the method in any one of claims 1 to 8.

11. A computer readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to realize the method in any one of claims 1 to 8.

12. A computer program product, characterised in that, The computer program product includes a computer program, and the computer program is executed by the processor to realize the method in any one of claims 1 to 8.

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