Method and device for evaluating energy efficiency state of oilfield water injection system

Abstract

The invention discloses a method and a device for evaluating the energy efficiency state of an oilfield water injection system. The method comprises the following steps: calculating actual energy efficiency values corresponding to a plurality of energy efficiency evaluation indexes according to production data of a to-be-evaluated oilfield water injection system; calculating an index score corresponding to each actual energy efficiency value according to the relationship between each obtained actual energy efficiency value and the corresponding reference energy efficiency value; determining a score weight corresponding to each energy efficiency evaluation index according to the correlation among the plurality of energy efficiency evaluation indexes and the energy saving amount ratio of each energy efficiency evaluation index to the to-be-evaluated oilfield water injection system; and evaluating the energy efficiency state of the to-be-evaluated oilfield water injection system according to the index scores and score weights corresponding to all the obtained actual energy efficiency values. According to the embodiment of the invention, a plurality of independent energy efficiency evaluation indexes are integrated, and the overall evaluation of the energy efficiency state of the oilfield water injection system is realized, so that the evaluation accuracy is improved.

Description

Technical Field

[0001] This article relates to energy consumption assessment technology, and in particular to an assessment method and device for the energy efficiency status of an oilfield water injection system. Background Art

[0002] The oilfield water injection system is a facility that uses injection wells to inject water into the oil layer to supplement and maintain the oil layer pressure. The evaluation of the energy efficiency status of the oilfield water injection system is of great significance to the utilization of the oilfield water injection system.

[0003] In the related art, one energy efficiency evaluation index is often used to evaluate the energy efficiency status of the water injection system, or multiple energy efficiency evaluation indexes are used to evaluate the energy efficiency status of the water injection system separately to obtain the energy efficiency status of the water injection system evaluated under each energy efficiency evaluation index.

[0004] However, this method can only independently evaluate the energy efficiency status of the oilfield water injection system under each energy efficiency evaluation index, but cannot make an overall evaluation of the energy efficiency status of the oilfield water injection system, so the evaluation accuracy is not high. Summary of the invention

[0005] The present application provides a method and device for evaluating the energy efficiency status of an oilfield water injection system, which can comprehensively evaluate the energy efficiency status of the oilfield water injection system, thereby improving the accuracy of the evaluation.

[0006] On the one hand, the present application provides a method for evaluating the energy efficiency status of an oilfield water injection system, comprising:

[0007] Calculate the actual energy efficiency values ​​corresponding to the multiple energy efficiency evaluation indicators according to the production data of the oilfield water injection system to be evaluated; wherein the multiple energy efficiency evaluation indicators at least include: a power consumption index per unit pressure water injection volume, the power consumption index per unit pressure water injection volume is used to represent the power consumption per unit volume of water injected under the unit injection pressure of the oilfield water injection system to be evaluated;

[0008] According to the relationship between each actual energy efficiency value obtained and the corresponding benchmark energy efficiency value, calculate the indicator score corresponding to each actual energy efficiency value;

[0009] Determine a scoring weight corresponding to each energy efficiency evaluation indicator according to the correlation between the multiple energy efficiency evaluation indicators and the proportion of energy saving of each energy efficiency evaluation indicator to the oilfield water injection system to be evaluated;

[0010] The energy efficiency status of the oilfield water injection system to be evaluated is evaluated according to the indicator scores and score weights corresponding to all the actual energy efficiency values ​​obtained.

[0011] On the other hand, the present application provides an evaluation device for the energy efficiency status of an oilfield water injection system, comprising: a memory and a processor, wherein the memory is used to store an executable program;

[0012] The processor is used to read and execute the executable program to implement the above-mentioned method for evaluating the energy efficiency status of the oilfield water injection system.

[0013] Compared with the related art, the present application includes calculating the actual energy efficiency values ​​corresponding to multiple energy efficiency evaluation indicators based on the production data of the oilfield water injection system to be evaluated, calculating the indicator score and scoring weight corresponding to each actual energy efficiency value, and evaluating the energy efficiency status of the oilfield water injection system to be evaluated based on the indicator scores and scoring weights corresponding to all the obtained actual energy efficiency values. Therefore, multiple independent energy efficiency evaluation indicators are integrated to achieve an overall evaluation of the energy efficiency status of the oilfield water injection system, thereby improving the evaluation accuracy.

[0014] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0016] Figure 1 A schematic flow chart of a method for evaluating the energy efficiency status of an oilfield water injection system provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the structure of an evaluation device for the energy efficiency status of an oilfield water injection system provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0020] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0021] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0022] The present application embodiment provides a method for evaluating the energy efficiency status of an oilfield water injection system. Figure 1 As shown, including:

[0023] Step 101, calculating actual energy efficiency values ​​corresponding to a plurality of energy efficiency evaluation indicators according to production data of the oilfield water injection system to be evaluated;

[0024] Step 102: Calculate the index score corresponding to each actual energy efficiency value according to the relationship between each actual energy efficiency value and the corresponding benchmark energy efficiency value;

[0025] Step 103: Determine a scoring weight corresponding to each energy efficiency evaluation indicator according to the correlation between the multiple energy efficiency evaluation indicators and the proportion of energy saving of each energy efficiency evaluation indicator to the oilfield water injection system to be evaluated;

[0026] Step 104: Evaluate the energy efficiency status of the oilfield water injection system to be evaluated according to the index scores and score weights corresponding to all the actual energy efficiency values ​​obtained.

[0027] Exemplarily, the weighted sum of the indicator score value and the corresponding score weight of each energy efficiency evaluation indicator is calculated to obtain the energy efficiency status score of the above oilfield water injection system.

[0028] The oilfield water injection system is a facility that uses water injection wells to inject water into the oil layer to supplement and maintain the oil layer pressure. After the oil field is put into development, as the mining time increases, the energy of the oil layer itself is continuously consumed, causing the oil layer pressure to continue to drop, underground crude oil is degassed in large quantities, the viscosity increases, the oil well production is greatly reduced, and even the spraying and production are stopped, and a large amount of dead oil that cannot be produced remains underground. In order to make up for the underground deficit caused by the extraction of crude oil, maintain or increase the oil layer pressure, achieve high and stable production of the oil field, and obtain a higher recovery rate, the oil field must be injected with water. Through the analysis of the water distribution process and related equipment of the oilfield water injection system, the oilfield water injection system to be evaluated adopts a single-main pipe multi-well water distribution process. The water from the source enters the water injection pump. After metering, filtration, buffering, and sedimentation, it is boosted and metered by the water injection pump, and then distributed to the water injection pipeline (or described as a water injection network) by the outbound valve group, controlled, regulated, and metered in the multi-well water distribution room, and finally transported to the water injection well to be injected into the oil layer. The oilfield water injection system consumes a lot of electricity. According to actual measurements, it accounts for more than 40% of the electricity consumption of oilfield production. Therefore, the development of energy-saving technologies and equipment for oilfield water injection systems has always been one of the focuses of oilfield energy conservation. However, in the energy consumption assessment of oilfield surface engineering, some schemes are to build adaptive evaluation models for each energy-consuming equipment in the oilfield water injection system (such as compression system, nitrogen production system and pump unit system), and then evaluate the overall energy consumption of the overall oilfield water injection system based on whether each energy-consuming equipment is operating normally or in line with expectations. Sometimes it is difficult to obtain the corresponding evaluation results in real time based on production operation data; in addition, adaptive evaluation models are built for each energy-consuming equipment separately, and the correlation between each model is less considered. It only depends on whether each energy-consuming equipment is operating normally or in line with expectations to evaluate the overall energy consumption of the oilfield water injection system. The results obtained are relatively qualitative results, and the quantitative reference value is low.

[0029] The method for evaluating the energy efficiency status of an oilfield water injection system provided in an embodiment of the present application calculates actual energy efficiency values ​​corresponding to each of a plurality of energy efficiency evaluation indicators based on production data of the oilfield water injection system to be evaluated, calculates an indicator score and a scoring weight corresponding to each actual energy efficiency value, and evaluates the energy efficiency status of the oilfield water injection system to be evaluated based on the indicator scores and scoring weights corresponding to all obtained actual energy efficiency values. Thus, a plurality of independent energy efficiency evaluation indicators are integrated, thereby realizing an overall evaluation of the energy efficiency status of the oilfield water injection system, thereby improving the accuracy of the evaluation.

[0030] The method for evaluating the energy efficiency status of an oilfield water injection system provided in the embodiment of the present application determines the actual index value corresponding to the energy efficiency evaluation index based on production data, can evaluate the energy efficiency status in real time or according to a certain statistical period, and has the advantages of convenient data collection process and convenient and reasonable index calculation; and according to the correlation between the energy efficiency evaluation indicators and the proportion of energy saving, determines the scoring weights of the above energy efficiency evaluation indicators, avoiding the drawbacks of simply allocating weights based on artificial weights or setting uniform weights for models of various conditions and various energy-consuming equipment, and because the correlation between the energy efficiency evaluation indicators in the oilfield water injection system and the comprehensive situation of the proportion of each energy efficiency evaluation indicator to energy saving are taken into consideration, the scoring weights of the energy efficiency evaluation indicators determined in this way are The weights are relatively objective and reasonable, and can be adapted to the various equipment composition conditions and operating conditions of the oilfield water injection system to be evaluated, avoiding the problem of unreasonable weight distribution caused by inadequate consideration when setting weights manually or by directly calculating weights because some evaluation indicators are related to other evaluation indicators; the score value calculated based on each energy efficiency evaluation indicator can reflect the gap between the actual indicator value and the indicator benchmark value of the item, and the energy efficiency status score of the oilfield water injection system obtained by calculating the weighted sum based on the score value and the score weight can reflect the comprehensive energy consumption situation, realize the evaluation of the overall energy consumption, realize the automatic collection and processing of production data, and can give scientific and reasonable evaluation results and guide the energy-saving improvement direction of the oilfield water injection system.

[0031] In an exemplary embodiment, the energy efficiency evaluation index includes: a power consumption index per unit pressure water injection volume, and the power consumption index per unit pressure water injection volume is used to represent the power consumption per unit volume of water injected under unit injection pressure of the oilfield water injection system to be evaluated.

[0032] The power consumption index of water injection volume per unit pressure belongs to the power consumption type energy efficiency index. In the related art, the power consumption per unit water injection is generally used as the power consumption type energy efficiency index, but this energy efficiency index does not take into account the influence of the boost pressure on the energy consumption, which makes the index incomparable. The method for evaluating the energy efficiency status of the oilfield water injection system provided in the embodiment of the present application can effectively eliminate the influence of pressure on unit consumption by introducing the power consumption per unit pressure water injection as the energy efficiency index, so that the index has good comparability under different water injection pressures.

[0033] For example, when the unit volume is 1 cubic meter, the power consumption per unit pressure injection volume is C 3-1 Specifically, it may refer to the power consumption per cubic meter of water injected under the unit injection pressure of the oil field water injection system to be evaluated.

[0034] For example, if there are multiple oilfield water injection systems to be evaluated, the energy efficiency status of the multiple oilfield water injection systems to be evaluated can be evaluated according to the evaluation method of the energy efficiency status of the oilfield water injection system provided in the embodiment of the present application, and the evaluation results are expressed as scores, thereby obtaining energy efficiency status scores of the multiple oilfield water injection systems to be evaluated.

[0035] In an exemplary embodiment, after obtaining the energy efficiency status scores of multiple oilfield water injection systems to be evaluated, the method further includes:

[0036] Multiple oilfield water injection systems to be evaluated are ranked according to their energy efficiency status scores.

[0037] In an exemplary embodiment, after sorting a plurality of oilfield water injection systems to be evaluated, the method further includes:

[0038] The actual index values, benchmark index values ​​and optimizable factors of the energy efficiency evaluation indicators corresponding to the energy efficiency status scores that are ranked at a preset rear position or proportion are displayed, wherein the optimizable factors are determined based on the gaps between the respective index values ​​in the actual index values ​​and the benchmark index values ​​and the influencing factors that have an impact on the energy efficiency evaluation indicators.

[0039] For example, in a specific implementation scenario, the energy efficiency status scores are ranked according to their level, with the higher scores ranked first. Based on the ranking results, in terms of energy-saving management incentives, the candidates of the oilfield water injection system to be evaluated that are ranked in the top preset proportion (e.g., the top 10%) or rank (e.g., the top 3) can be rewarded, and the candidates that are ranked in the lower preset rank (e.g., the last 2) or preset proportion (the last 5%) can be given optimization tips or punishment measures.

[0040] In an exemplary embodiment, the production data used to calculate the actual energy efficiency value corresponding to the power consumption index of the unit pressure water injection volume includes: the flow rate of the water injection well, the inlet pressure of the water injection well, the motor input power of the water injection pump, the motor current of the water injection pump, and the motor voltage of the water injection pump; the actual energy efficiency value corresponding to the power consumption index of the unit pressure water injection volume is calculated in the following way:

[0041]

[0042]

[0043]

[0044] Among them, M JWP The power consumption per unit pressure of the oil field water injection system, Ne sys is the hourly power consumption of the oilfield water injection system, m is the total number of water injection wells in the oilfield water injection system, G wi is the flow rate of the i-th injection well, Pwzi is the injection pressure of the ith water injection well, n is the total number of water injection pumps in the oil field water injection system, N Mini is the motor input power of the i-th water injection pump, I i is the motor current of the i-th water injection pump, U i is the motor voltage of the i-th water injection pump, is the motor power factor of the i-th water injection pump.

[0045] In actual operation, the following simplified expression can be used for calculation:

[0046]

[0047] Among them, by adjusting the wellhead injection pressure P of each wellhead j井口 and the corresponding single well water injection volume G j井口 Multiply and add all the wellhead results to get the total pressure of the water injection system; divide the total power consumption of the water injection system (power consumption per hour) by the total pressure of the water injection system to get the power consumption per unit pressure of water injection, where the constant 0.272 can be adjusted according to the conversion relationship between actual units. The unit of the corresponding wellhead injection pressure is MPa (megapascals), and the unit of the single well water injection volume is t / h (tons per hour). By simply obtaining the pressure and water injection volume of each single well in the oilfield water injection system, the actual index value of the energy efficiency evaluation index of power consumption per unit pressure of a large number of wells can be quickly calculated.

[0048] In an exemplary embodiment, the energy efficiency evaluation index further includes: an efficiency index of a water injection pump unit, and the production data used to calculate the actual energy efficiency value corresponding to the efficiency index of the water injection pump unit includes: the input energy of the water injection pump unit and the outflow rate of the water injection pump; the actual energy efficiency value corresponding to the efficiency index of the water injection pump unit is calculated in the following manner:

[0049]

[0050]

[0051] Among them, η u is the efficiency of the water injection pump unit, N MPin Input energy for the water injection pump unit, p u is the output power of the water injection pump unit, ρ is the fluid density, g is the gravitational acceleration, G P is the flow rate of the water injection pump, and H is the head of the water injection pump.

[0052] For example, the water injection pump unit efficiency C 3-2 It refers to the ratio of the injection pump output energy to the unit input energy, expressed as a percentage.

[0053] In some embodiments, by integrating the calculation formula of the actual energy efficiency value corresponding to the efficiency index of the water injection pump unit, a simplified expression is obtained as follows:

[0054] The efficiency of the water injection pump unit = gravity acceleration constant × water injection pump flow × (pump outlet pressure - pump inlet pressure) × the first unit conversion coefficient ÷ (the second unit conversion coefficient × the hourly power consumption of the water injection pump unit); wherein, the first unit conversion coefficient is a conversion constant set to convert the time unit in the water pumping volume into the time unit consistent with the time unit in the gravity acceleration constant, and the second unit conversion coefficient is a conversion constant set to convert the time unit in the hourly power consumption of the water injection pump unit into the time unit consistent with the time unit in the gravity acceleration constant.

[0055] For example, water injection pump unit efficiency = 9.81 m / s 2 × pumping volume t / h (tons per hour) × (pump outlet pressure MPa - pump inlet pressure MPa) × 100m / MPa (meter per megapascal) ÷ ​​3600s / h (an example of the first unit conversion coefficient, converting data per second into data per hour) ÷ power consumption of the pump unit per hour kW·h, where the pumping volume, pressure, power consumption, etc. can be captured from the water injection pump production report of the A5 system of an oil field.

[0056] In an exemplary embodiment, the energy efficiency evaluation index further includes: an injection pipeline energy utilization index, and the production data used to calculate the actual energy efficiency value corresponding to the injection pipeline energy utilization index include: the injection pressure of the injection well, the flow rate of the injection well, the outlet pressure of the injection pump, and the flow rate of the injection pump; the actual energy efficiency value corresponding to the injection pipeline energy utilization index is calculated in the following manner:

[0057]

[0058] Among them, η pip is the energy utilization rate of the water injection pipeline, m is the total number of water injection wells in the oil field water injection system, b is the total number of water injection pumps in the oil field water injection system, and p Wz is the injection pressure at the wellhead of the injection well, G W is the flow rate of the injection well, p Soutz is the outlet pressure of the water injection pump, G S is the flow rate of the water injection pump. For example, the energy utilization rate of the water injection pipeline C 3-3 It refers to the ratio of the energy of effective water injection at the wellhead in the water injection pipeline (also described as the water injection network) to the sum of the output energy of the water injection pump.

[0059] In an exemplary embodiment, the calculation of the index score corresponding to each actual energy efficiency value according to the relationship between each actual energy efficiency value obtained and the corresponding benchmark energy efficiency value includes: for the water injection pump unit efficiency index and the water injection pipeline energy utilization index, Calculate the corresponding indicator scores;

[0060] For the power consumption index of unit pressure water injection volume, Calculate the corresponding indicator score;

[0061] Among them, C j represents the index score of the j-th energy efficiency evaluation, D j represents the actual energy efficiency value of the jth energy efficiency evaluation index, D j Represents the benchmark energy efficiency value of the jth energy efficiency evaluation index.

[0062] For example, if the actual energy efficiency value of the water injection pump unit is 60% and the benchmark energy efficiency value is 75%, then the score is 60% ÷ 75% × 100 = 80 points. Here, the full score is 100, so the calculation formula in the above indicator score is multiplied by 100, and the full score value can also be adjusted accordingly according to the actual situation. For example, the actual indicator value of power consumption per unit pressure water injection volume is 8kW·h / (MPam 3 ) (kilowatt-hour per megapascal per cubic meter), the base value is 6kW·h / (MPam 3 ), then the score is: (1-(8-6)÷6)×100=66.7.

[0063] In an exemplary embodiment, the benchmark energy efficiency value corresponding to the power consumption index per unit pressure water injection volume includes: an optimal value obtained by simulating and calculating the water injection system of the oil field to be evaluated using water injection system optimization software.

[0064] In an exemplary embodiment, the benchmark energy efficiency value corresponding to the water injection pump unit efficiency index includes: a standard efficiency of a water injection pump of a corresponding specification obtained from a preset standard specification.

[0065] In an exemplary embodiment, the benchmark energy efficiency value corresponding to the water injection pipeline energy utilization index includes: an optimal value obtained by simulating and calculating the water injection optimization software according to the pipeline design diameter and the pipe wall friction coefficient.

[0066] In practical applications, due to scaling year by year, the energy utilization rate of the water injection pipeline will decrease year by year. Therefore, an adjustment coefficient can be designed according to the average rate of annual decline. The adjustment coefficient is multiplied by the age and then by the initial pipe wall friction coefficient to calculate the current pipe wall friction coefficient. Then, the optimal value obtained by simulation calculation using water injection optimization software is used as the benchmark energy efficiency value corresponding to the current water injection pipeline energy utilization index.

[0067] For example, for the energy efficiency evaluation index water injection pump unit efficiency C 3-2 By consulting the standard specifications, determine the energy saving value of the equipment under the corresponding specifications as the index benchmark value. For example, for the rated displacement of 300 to 400 (unit: m 3 / h) of the centrifugal pump, 75% will determine the efficiency C of the water injection pump unit 3-2 The benchmark value of the indicator.

[0068] Power consumption index C per unit pressure water injection volume 3-1 , water injection pump unit efficiency C 3-2 and the energy utilization rate of the water injection pipeline C 3-3 The actual energy efficiency value and the benchmark energy efficiency value can be obtained as shown in Table 1.

[0069] Table 1

[0070]

[0071] In an exemplary embodiment, the scoring weight corresponding to each energy efficiency evaluation indicator is determined according to the correlation between the multiple energy efficiency evaluation indicators and the proportion of energy saving of each energy efficiency evaluation indicator to the oilfield water injection system to be evaluated, including:

[0072] First, through Calculate the scoring weight W of power consumption energy efficiency indicators 1 ; Where C = A + B, C is the energy saving amount of the power consumption energy efficiency index within the set statistical period, A is the energy saving amount of the equipment energy efficiency index, and B represents the energy saving amount of the system optimization index;

[0073] Secondly, through The scoring weight W of energy efficiency indicators for computing equipment 2 ;

[0074] Next, the calculated scoring weight W of the power consumption energy efficiency index is 1 As a scoring weight for the power consumption index per unit pressure water injection volume;

[0075] Finally, the calculated scoring weight W of the equipment energy efficiency index is 2As the scoring weights corresponding to the water injection pump unit efficiency index and the water injection pipeline energy utilization index, or, according to the energy loss relationship and the scoring weight W 2 Obtain the scoring weights corresponding to the water injection pump unit efficiency index and the water injection pipeline energy utilization index respectively; wherein the energy loss relationship includes: the relationship between the energy loss amount inside the water injection pump unit in the oilfield water injection system to be evaluated and the energy loss amount of the external pipeline network.

[0076] The main ways to improve the energy efficiency of oilfield water injection systems are: (1) Implementing energy-saving transformation to improve the efficiency of water injection pumps and water injection pipe networks. The main measures include removing scale from water injection pipe networks to reduce flow resistance, reducing wellhead throttling losses, and measures to improve the efficiency of various water injection pumps. (2) Energy saving achieved through system optimization operation does not rely on energy-saving transformation of hardware equipment, but rather on optimizing the combination of water injection pump start-up schemes and optimizing water injection volume. Among them, the reduction of power consumption per unit pressure injection volume is a comprehensive effect of various measures, including energy saving from equipment energy efficiency indicators and system optimization.

[0077] In an exemplary embodiment, the energy loss relationship and the scoring weight W 2 Obtaining the scoring weights corresponding to the water injection pump unit efficiency index and the water injection pipeline energy utilization index, respectively, including:

[0078] Obtaining the internal energy loss of the water injection pump unit and the external pipe network energy loss in the water injection system of the oil field to be evaluated;

[0079] First, through Calculate the scoring weight W corresponding to the efficiency index of the water injection pump unit 21 ;

[0080] Secondly, through Calculate the scoring weight W corresponding to the water injection pipeline energy utilization index 22 ; Wherein, D is the internal energy loss of the water injection pump unit in the oilfield water injection system to be evaluated, and E is the external pipeline energy loss in the oilfield water injection system to be evaluated.

[0081] In an exemplary embodiment, the step of obtaining the internal energy loss of the water injection pump unit and the external pipeline network energy loss in the water injection system of the oil field to be evaluated includes:

[0082] pass Calculate the internal energy loss of the water injection pump unit in the water injection system of the oil field to be evaluated; where Ne i is the hourly power consumption of the i-th water injection pump, G i is the flow rate of the i-th water injection pump, P i出口is the outlet pressure of the i-th injection pump, P i入口 is the inlet pressure of the i-th injection pump;

[0083] pass Calculate the external pipe network energy loss of the water injection pump unit in the water injection system of the oil field to be evaluated; where P i泵出口 is the outlet pressure of the ith water injection pump, G i泵出口 is the flow rate of the i-th water injection pump, P j井口 is the inlet pressure of the jth injection well, G j井口 is the flow rate of the jth injection well.

[0084] For example, the internal energy loss of the water injection pump unit (in kW·h) = the power consumption of the water injection pump (in kW·h) - 9.81m / s 2 × pump water volume t / h (tons per hour) × (pump outlet pressure MPa - pump inlet pressure MPa) × 100m / MPa × ÷ (3600s / h, example of the first unit conversion coefficient, converting seconds and hours).

[0085] The embodiment of the present application also provides an evaluation device for the energy efficiency status of an oilfield water injection system, comprising: a memory and a processor, wherein the memory is used to store an executable program;

[0086] The processor is used to read and execute the executable program to implement the method for evaluating the energy efficiency status of the oilfield water injection system described in any of the above embodiments.

[0087] The device for evaluating the energy efficiency status of an oilfield water injection system provided in an embodiment of the present application calculates actual energy efficiency values ​​corresponding to each of a plurality of energy efficiency evaluation indicators based on production data of the oilfield water injection system to be evaluated, calculates an indicator score and a scoring weight corresponding to each actual energy efficiency value, and evaluates the energy efficiency status of the oilfield water injection system to be evaluated based on the indicator scores and scoring weights corresponding to all obtained actual energy efficiency values. Thus, a plurality of independent energy efficiency evaluation indicators are integrated, thereby realizing an overall evaluation of the energy efficiency status of the oilfield water injection system, thereby improving the accuracy of the evaluation.

[0088] The present application also provides an evaluation device for the energy efficiency status of an oilfield water injection system. Figure 2 As shown, the device for evaluating the energy efficiency status of the oilfield water injection system includes: an index value determination module 201, an index scoring module 202, a scoring weight determination module 203 and an energy efficiency status scoring module 204.

[0089] The index value determination module 201 is used to calculate the actual energy efficiency values ​​corresponding to the multiple energy efficiency evaluation indicators according to the production data of the oil field water injection system to be evaluated;

[0090] The index scoring module 202 is used to calculate the index score corresponding to each actual energy efficiency value according to the relationship between each actual energy efficiency value and the corresponding benchmark energy efficiency value.

[0091] The scoring weight determination module 203 is used to determine the scoring weight corresponding to each energy efficiency evaluation indicator according to the correlation between the multiple energy efficiency evaluation indicators and the proportion of energy saving of each energy efficiency evaluation indicator to the oilfield water injection system to be evaluated.

[0092] The energy efficiency status scoring module 204 is used to evaluate the energy efficiency status of the oilfield water injection system to be evaluated according to the index scores and scoring weights corresponding to all the actual energy efficiency values ​​obtained.

[0093] In an exemplary instance, the evaluation device for the energy efficiency status of an oilfield water injection system further includes: a sorting module and a display module; wherein the sorting module is used to sort according to the above-mentioned energy efficiency status score, and the display module is used to display the actual index value, benchmark index value and optimizable factors of the energy efficiency evaluation index corresponding to the energy efficiency status score that is ranked at a preset position or proportion, wherein the above-mentioned optimizable factors are determined based on the gap between each index value in the above-mentioned actual index value and the benchmark index value and the above-mentioned influencing factors that have an impact on the energy efficiency evaluation index.

[0094] The present application also provides an electronic device, such as Figure 3 As shown, the electronic device 3 includes a processor 301, a communication interface 302, a memory 303 and a communication bus 304, wherein the processor 301, the communication interface 302 and the memory 303 communicate with each other through the communication bus 304; the memory 303 is used to store computer programs; the processor 301 is used to implement the above-mentioned method for evaluating the energy efficiency status of the oilfield water injection system when executing the program stored in the memory.

[0095] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the disclosed methods above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical elements; for example, a physical element may have multiple functions, or a function or step may be performed by several physical elements in cooperation. Some or all elements may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A method for evaluating the energy efficiency status of an oilfield water injection system, characterized in that: include: Calculate the actual energy efficiency values ​​corresponding to multiple energy efficiency evaluation indicators according to the production data of the oil field water injection system to be evaluated; According to the relationship between each actual energy efficiency value obtained and the corresponding benchmark energy efficiency value, calculate the indicator score corresponding to each actual energy efficiency value; Determine a scoring weight corresponding to each energy efficiency evaluation indicator according to the correlation between the multiple energy efficiency evaluation indicators and the proportion of energy saving of each energy efficiency evaluation indicator to the oilfield water injection system to be evaluated; The energy efficiency status of the oilfield water injection system to be evaluated is evaluated according to the indicator scores and score weights corresponding to all the actual energy efficiency values ​​obtained.

2. The method according to claim 1, characterized in that: The energy efficiency evaluation index includes: a power consumption index per unit pressure water injection volume, which is used to indicate the power consumption per unit volume of water injected under the unit injection pressure of the oil field water injection system to be evaluated; The production data used to calculate the actual energy efficiency value corresponding to the power consumption index of the unit pressure water injection volume includes: the flow rate of the water injection well, the inlet pressure of the water injection well, the motor input power of the water injection pump, the motor current of the water injection pump, and the motor voltage of the water injection pump; the actual energy efficiency value corresponding to the power consumption index of the unit pressure water injection volume is calculated in the following way: Among them, M JWP The power consumption per unit pressure of the oil field water injection system, Ne sys is the hourly power consumption of the oilfield water injection system, m is the total number of water injection wells in the oilfield water injection system, G wi is the flow rate of the i-th injection well, P wzi is the injection pressure of the ith water injection well, n is the total number of water injection pumps in the oil field water injection system, N Mini is the motor input power of the i-th water injection pump, I i is the motor current of the i-th water injection pump, U i is the motor voltage of the i-th water injection pump, is the motor power factor of the i-th water injection pump.

3. The method according to claim 1 or 2, characterized in that: The energy efficiency evaluation index also includes: an efficiency index of a water injection pump unit. The production data used to calculate the actual energy efficiency value corresponding to the efficiency index of the water injection pump unit includes: the input energy of the water injection pump unit and the flow rate of the water injection pump; the actual energy efficiency value corresponding to the efficiency index of the water injection pump unit is calculated in the following manner: Among them, η u is the efficiency of the water injection pump unit, N MPin Input energy for the water injection pump unit, p u is the output power of the water injection pump unit, ρ is the fluid density, g is the gravitational acceleration, G P is the flow rate of the water injection pump, and H is the head of the water injection pump.

4. The method according to claim 3, characterized in that The energy efficiency evaluation index also includes: an energy utilization index of a water injection pipeline. The production data used to calculate the actual energy efficiency value corresponding to the energy utilization index of the water injection pipeline include: the injection pressure of the water injection well, the flow rate of the water injection well, the outlet pressure of the water injection pump, and the flow rate of the water injection pump. The actual energy efficiency value corresponding to the energy utilization index of the water injection pipeline is calculated in the following manner: Among them, η pip is the energy utilization rate of the water injection pipeline, m is the total number of water injection wells in the oil field water injection system, b is the total number of water injection pumps in the oil field water injection system, and p Wz is the injection pressure of the injection well, G W is the flow rate of the injection well, p Soutz is the outlet pressure of the water injection pump, G S is the flow rate of the water injection pump.

5. The method according to claim 4, characterized in that The step of calculating the index score corresponding to each actual energy efficiency value according to the relationship between each actual energy efficiency value and the corresponding benchmark energy efficiency value comprises: For the water injection pump unit efficiency index and the water injection pipeline energy utilization index, Calculate the corresponding indicator scores; For the power consumption index of unit pressure water injection volume, Calculate the corresponding indicator score; Among them, C j represents the index score of the j-th energy efficiency evaluation, D j represents the actual energy efficiency value of the jth energy efficiency evaluation index, D j Represents the benchmark energy efficiency value of the jth energy efficiency evaluation index.

6. The method according to claim 5, characterized in that The benchmark energy efficiency value corresponding to the power consumption index per unit pressure water injection volume includes: the optimal value obtained by simulating and calculating the water injection system of the oil field to be evaluated using water injection system optimization software; The benchmark energy efficiency value corresponding to the water injection pump unit efficiency index includes: the standard efficiency of the corresponding specification water injection pump obtained from the preset standard specification; The benchmark energy efficiency value corresponding to the water injection pipeline energy utilization index includes: an optimal value obtained by simulation calculation using water injection optimization software based on the pipeline design diameter and pipe wall friction coefficient.

7. The method according to claim 1, characterized in that Determining the scoring weight corresponding to each energy efficiency evaluation indicator according to the correlation between the multiple energy efficiency evaluation indicators and the proportion of energy saving of each energy efficiency evaluation indicator to the oilfield water injection system to be evaluated includes: pass Calculate the scoring weight W1 of the power consumption energy efficiency index; where C = A + B, C is the energy saving amount of the power consumption energy efficiency index within the set statistical period, A is the energy saving amount of the equipment energy efficiency index, and B represents the energy saving amount of the system optimization index; pass The scoring weight of the energy efficiency index of computing equipment is W2; The calculated scoring weight W1 of the power consumption energy efficiency index is used as the scoring weight of the power consumption index per unit pressure water injection volume; The calculated scoring weight W2 of the equipment energy efficiency index is used as the scoring weight corresponding to the water injection pump unit efficiency index and the water injection pipeline energy utilization index, or the scoring weight corresponding to the water injection pump unit efficiency index and the water injection pipeline energy utilization index is obtained according to the energy loss relationship and the scoring weight W2; wherein the energy loss relationship includes: the relationship between the energy loss amount inside the water injection pump unit and the energy loss amount of the external pipeline network in the oilfield water injection system to be evaluated.

8. The method according to claim 7, characterized in that The step of obtaining the scoring weights corresponding to the water injection pump unit efficiency index and the water injection pipeline energy utilization index according to the energy loss relationship and the scoring weight W2 includes: Obtaining the internal energy loss of the water injection pump unit and the external pipe network energy loss in the water injection system of the oil field to be evaluated; pass Calculate the scoring weight W corresponding to the efficiency index of the water injection pump unit 21 ; pass Calculate the scoring weight W corresponding to the water injection pipeline energy utilization index 22 ; Wherein, D is the internal energy loss of the water injection pump unit in the oilfield water injection system to be evaluated, and E is the external pipeline energy loss in the oilfield water injection system to be evaluated.

9. The method according to claim 8, characterized in that The obtaining of the internal energy loss of the water injection pump unit and the external pipe network energy loss in the water injection system of the oil field to be evaluated comprises: pass Calculate the internal energy loss of the water injection pump unit in the water injection system of the oil field to be evaluated; where Ne i is the hourly power consumption of the i-th water injection pump, G i is the flow rate of the i-th water injection pump, P i出口 is the outlet pressure of the i-th injection pump, P i入口 is the inlet pressure of the i-th injection pump; pass Calculate the external pipe network energy loss of the water injection pump unit in the water injection system of the oil field to be evaluated; where P i泵出口 is the outlet pressure of the ith water injection pump, G i泵出口 is the flow rate of the i-th water injection pump, P j井口 is the inlet pressure of the jth injection well, G j井口 is the flow rate of the jth injection well.

10. An evaluation device for the energy efficiency status of an oilfield water injection system, characterized in that: include: A memory and a processor, wherein the memory is used to store an executable program; The processor is used to read and execute the executable program to implement the method for evaluating the energy efficiency status of an oilfield water injection system as described in any one of claims 1-9.

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