CN114154331B - SAGD development efficiency evaluation method based on energy efficiency model - Google Patents
SAGD development efficiency evaluation method based on energy efficiency model Download PDFInfo
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- CN114154331B CN114154331B CN202111475816.6A CN202111475816A CN114154331B CN 114154331 B CN114154331 B CN 114154331B CN 202111475816 A CN202111475816 A CN 202111475816A CN 114154331 B CN114154331 B CN 114154331B
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Abstract
The invention relates to an energy efficiency model-based SAGD development efficiency evaluation method, which belongs to the technical field of oil and gas exploitation and comprises the following steps: establishing a basic numerical model based on geological data and logging data of a target oil reservoir; determining the mining mode of the target oil reservoir, and performing history fitting on the numerical model based on the field actual production data of the target oil reservoir to enable the numerical model to represent the target oil reservoir to a certain extent; setting different extraction regulation and control schemes based on the mining mode, and carrying out numerical simulation prediction on the future production condition of the oil reservoir; calculating the accumulated energy utilization efficiency under different operating parameters by using an energy utilization efficiency calculation model based on the numerical simulation prediction result; and drawing a graph of the change curve of the energy utilization efficiency along with different operating parameters, performing regression calculation on the curve, and determining the specific operating parameters reaching the highest energy utilization efficiency. According to the optimized operating parameters, the site construction can be guided, the energy utilization efficiency of thermal recovery is improved, and the cost is reduced and the efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploitation, and particularly relates to an SAGD development efficiency evaluation method based on an energy efficiency model.
Background
With the increase of exploration strength of unconventional oil and gas resources in China and even worldwide, the unconventional geological reserves which are explored at present are more and more. The heavy oil occupies large proportion of unconventional oil gas resources, has wide distribution range, and the heavy oil is usually mined by adopting a thermal mining mode by utilizing the principle that the viscosity of the heavy oil is sharply reduced along with the rise of temperature. Thermal recovery generally adopts a steam injection mode to inject heat energy into a stratum, such as steam flooding, steam huff and puff, SAGD (steam assisted gravity drainage) and the like, but with the concern of people on environmental protection problems, greenhouse gas emission and other problems, the large energy consumption for producing steam in the SAGD process and the large amount of carbon dioxide discharged cause problems of people's fouling, and how to efficiently exploit energy is important. In order to effectively guide the field production, a thermal recovery evaluation method from the energy balance point of view is needed.
At present, indexes such as an oil-gas ratio or a gasoline-oil ratio are generally adopted for evaluating the economic evaluation of the thermal recovery process, and the larger the oil-gas ratio is, the better the thermal recovery effect is, and the higher the economic benefit is. The evaluation method utilizing the oil-gas ratio reflects the input-output relationship of the thermal recovery process to a certain extent under the condition that the injected fluid is not changed, but fundamentally simply utilizes the volume of the accumulated crude oil and the volume of the accumulated injected steam (cold water equivalent) and does not substantially reflect the input and output of energy in the whole thermal recovery process. For example, patent CN102587878A describes a multiple thermal fluid assisted gravity displacement process, which uses a gasoline ratio in evaluating thermal recovery effect, and it is considered that the gasoline ratio is decreased after using multiple thermal fluid, and the thermal recovery effect becomes better, but it is noted that in the process, the injection of steam is decreased, and theoretically, if the production effect is the same, the gasoline ratio is also decreased. Therefore, it can be seen that the gasoline ratio has a certain limitation in changing the injected fluid, except for this patent, for example, when the superheated steam is injected for thermal recovery, when the superheated steam is injected as compared with the gasoline produced by injecting normal saturated steam, one can think that the superheated steam and the normal saturated steam have the same economic benefit, but the superheated steam injection consumes much energy, because the energy consumed for producing the superheated steam with equal cold water equivalent is far higher than that of the normal saturated steam. Therefore, it is not reasonable to evaluate the production efficiency of both of them by the gasoline ratio at this time, and it is necessary to use an evaluation index from the viewpoint of energy balance.
Disclosure of Invention
In order to overcome the defects of the conventional evaluation method, the invention provides the SAGD development efficiency evaluation method based on the energy efficiency model.
The technical scheme of the invention is as follows:
the invention provides an SAGD development efficiency evaluation method based on an energy efficiency model, which comprises the following steps:
s1, establishing a basic numerical model based on geological data and logging data of the target oil reservoir;
s2, carrying out history fitting on the numerical model based on the field actual production data of the target oil deposit, ensuring that the history fitting degree reaches more than 99%, and representing the target oil deposit to a certain degree, and specifically comprising the following steps:
s21, sorting the production data of the target oil reservoir and importing numerical simulation software;
s22, adjusting relevant sensitivity parameters, and fitting indexes of a numerical model, such as steam injection rate, oil production rate, liquid production amount, steam injection amount, water content and the like;
s3, setting different extraction regulation schemes based on the extraction mode, and carrying out numerical simulation prediction on the future production condition of the oil reservoir, wherein the method specifically comprises the following steps:
s31, setting different regulation schemes, such as steam flooding, and setting different steam injection rates, steam injection temperatures, steam injection pressures and the like;
s32, modifying corresponding control parameters in numerical simulation software according to different regulation and control schemes, and carrying out production dynamic prediction on the target oil reservoir;
s4, calculating the accumulated energy utilization efficiency under different operating parameters by using an energy utilization efficiency calculation model based on the numerical simulation prediction result, and specifically comprising the following steps:
s41, sorting production prediction results of different regulation and control modes, and collecting steam accumulation and oil accumulation conditions of different regulation and control schemes;
s42, calculating the accumulated energy utilization efficiency of different schemes according to the proposed energy utilization efficiency calculation model;
and S5, drawing a graph of the change curve of the energy utilization efficiency along with different operating parameters, and performing regression calculation on the curve to accurately determine the specific operating parameters reaching the highest energy utilization efficiency.
Has the advantages that: the invention provides a method for determining the time for later conversion of superheated steam SAGD (steam assisted gravity drainage) to saturated steam by using thermal efficiency, which is characterized in that a numerical simulation means is used for carrying out geological modeling and historical fitting on an oil reservoir, an energy utilization efficiency calculation model is used for calculating the energy utilization efficiency of a prediction result based on a series of numerical simulation prediction experiments to obtain a graph plate of a change curve of the energy utilization efficiency along with different operation parameters, regression calculation is carried out on the curve, the specific operation parameters reaching the highest energy utilization efficiency are accurately determined to determine the optimal thermal recovery operation parameters, the thermal recovery cost is reduced, and the energy utilization efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart of the present invention
FIG. 2 is a chart of energy efficiency using superheated steam for a certain SAGD reservoir
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1, the present invention provides an energy efficiency model-based SAGD development efficiency evaluation method, including the following steps:
s0, selecting an oil reservoir to be evaluated;
s1, establishing a basic numerical model based on geological data and logging data of the target oil reservoir;
s2, carrying out history fitting on the numerical model based on the field actual production data of the target oil deposit, ensuring that the history fitting degree reaches more than 99%, and representing the target oil deposit to a certain degree, and specifically comprising the following steps:
s21, sorting the production data of the target oil reservoir and importing numerical simulation software;
s22, adjusting relevant sensitivity parameters, and fitting indexes of a numerical model, such as steam injection rate, oil production rate, liquid production amount, steam injection amount, water content and the like;
s3, setting different extraction regulation and control schemes based on the extraction mode, and carrying out numerical simulation prediction on the future production condition of the oil reservoir, wherein the method comprises the following specific steps:
s31, setting different steam injection rates, steam injection temperatures, steam injection pressures and the like;
s32, according to different regulation and control schemes, modifying corresponding control parameters in numerical simulation software, and carrying out production dynamic prediction on the target oil reservoir;
s4, calculating the accumulated energy utilization efficiency under different operating parameters by using an energy utilization efficiency calculation model based on the numerical simulation prediction result, and specifically comprising the following steps:
s41, sorting production prediction results of different regulation and control modes, and collecting steam accumulation and oil accumulation conditions of different regulation and control schemes;
s42, inquiring the physical parameters and density of the used steam and the physical parameters and density of the crude oil, and calculating the accumulated injected energy and the accumulated produced energy;
s43, calculating the accumulated energy utilization efficiency of different schemes according to the proposed energy utilization efficiency calculation model;
s44, the energy utilization efficiency model is as follows:
wherein eta is cumulative energy utilization efficiency, kJ/kJ, E Pro To accumulate the injected energy, J, E Inj J, α is the thermal efficiency of the boiler,%, for the accumulated energy produced;
s5, based on the determined thermal recovery method, please refer to the example in fig. 2, drawing a graph of a curve of the energy utilization efficiency varying with different operating parameters, and performing regression calculation on the curve, so as to accurately determine the specific operating parameters reaching the highest energy utilization efficiency, where the operating parameters corresponding to a in fig. 2 are the optimal control parameters in the current scheme.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and various changes and modifications can be made by those skilled in the art without departing from the scope of the present invention.
Claims (2)
1. A SAGD development efficiency evaluation method based on an energy efficiency model is characterized by comprising the following steps:
s1, establishing a basic numerical model based on geological data and logging data of the target oil reservoir;
s2, carrying out history fitting on the numerical model based on the field actual production data of the target oil deposit, ensuring that the history fitting degree reaches more than 99%, representing the target oil deposit to a certain extent, and specifically comprising the following steps:
s21, sorting the production data of the target oil reservoir and importing numerical simulation software;
s22, adjusting relevant sensitivity parameters, and fitting indexes of a numerical model, such as steam injection rate, oil production rate, liquid production amount, steam injection amount, water content and the like;
s3, setting different extraction regulation schemes based on the extraction mode, and carrying out numerical simulation prediction on the future production condition of the oil reservoir, wherein the method specifically comprises the following steps:
s31, setting different regulation schemes, different steam injection rates, steam injection temperatures, steam injection pressures and the like;
s32, according to different regulation and control schemes, modifying corresponding control parameters in numerical simulation software, and carrying out production dynamic prediction on the target oil reservoir;
s4, calculating the accumulated energy utilization efficiency under different operating parameters by using an energy utilization efficiency calculation model based on the numerical simulation prediction result, and specifically comprising the following steps:
s41, sorting production prediction results of different regulation and control modes, and collecting steam accumulation and oil accumulation conditions of different regulation and control schemes;
s42, calculating the accumulated energy utilization efficiency of different schemes according to the proposed energy utilization efficiency calculation model;
and S5, drawing a graph of a curve of the energy utilization efficiency along with the change of different operating parameters based on the determined thermal recovery mode, and performing regression calculation on the curve to accurately determine the specific operating parameters reaching the highest energy utilization efficiency.
2. The method for evaluating the development efficiency of the SAGD based on the energy efficiency model, as claimed in claim 1, wherein step S42 is a SAGD energy utilization efficiency calculation model.
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