A power grid and energy storage battery collaborative energy supply strategy for normal drilling operation of oil and gas drilling

Abstract

The application discloses a power grid and energy storage battery collaborative energy supply strategy for normal drilling operation of oil and gas drilling, and mainly solves the problems of poor collaborative energy supply effect of the power grid and the energy storage battery, impact on equipment caused by power mutation and the like caused by the fixed energy storage battery charging and discharging power threshold in the collaborative energy supply mode of the power grid and the energy storage battery. The scheduling strategy is based on the analysis of the power change rate characteristics of adjacent data collection points by combining the sliding window method, dynamically adjusts the power threshold and the power change rate threshold corresponding to the energy storage battery discharging, judges the energy storage battery charging and discharging state, and calculates the energy storage battery charging and discharging power. The scheduling strategy can solve the energy supply safety of the normal drilling operation of oil and gas drilling under the condition of power grid capacity reduction, can improve the collaborative energy supply effect of the power grid and the energy storage battery by dynamically adjusting the power threshold and the power change rate threshold, reduce the drilling operation cost, and reduce the impact on power transmission and distribution equipment.

Description

Technical Field

[0001] This invention belongs to the field of energy storage and charging technology, specifically, it relates to a power grid and energy storage battery collaborative power supply strategy for normal drilling operations in oil and gas wells. Background Technology

[0002] Currently, in the "electricity-for-oil" power supply model for oil and gas drilling, the grid capacity is typically determined based on peak power, resulting in low grid capacity utilization in most cases, underutilization of infrastructure resources, and increased drilling operation costs. In recent years, electrochemical energy storage batteries have been proposed to work in conjunction with the grid to supply power to oil and gas drilling operations. Based on the "peak shaving and valley filling" mechanism of energy storage batteries, the demand for grid capacity during oil and gas drilling operations can be reduced, thereby lowering drilling operation costs. However, existing energy storage battery charging and discharging strategies are primarily based on fixed thresholds; that is, the energy storage battery discharges when the oil and gas drilling power exceeds a fixed threshold and stops discharging when it falls below the fixed threshold. This approach does not fully consider the power and power change rate characteristics during oil and gas drilling operations, resulting in poor "peak shaving and valley filling" effects from energy storage batteries.

[0003] Normal drilling operations constitute the main process flow of oil and gas drilling, accounting for approximately 50% of the total drilling time. In most cases, the power and power change rate of normal oil and gas drilling operations fluctuate relatively little, with larger power fluctuations occurring only during mud pump start-up and shutdown or winch jacking. This can lead to significant voltage fluctuations in power transmission and distribution, or peak power exceeding grid capacity, affecting the safety of power supply for drilling operations and causing impacts on power transmission and distribution equipment. Therefore, there is an urgent need for a coordinated power supply strategy for normal oil and gas drilling operations using both the grid and energy storage batteries. Based on a thorough analysis of the power change rate characteristics of nearby data acquisition points, a charging and discharging strategy for energy storage batteries should be developed using two indicators: power threshold and power change rate threshold. This strategy should ensure the safety of power supply for oil and gas drilling under grid derating conditions, while effectively improving the coordinated power supply effect of the grid and energy storage batteries during normal oil and gas drilling operations, reducing drilling costs, and minimizing impacts on power transmission and distribution equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a power supply strategy that combines power grid and energy storage battery for normal oil and gas drilling operations, thereby solving the above-mentioned problems and technical requirements. The technical solution of this invention is as follows:

[0005] A power supply strategy that combines power grid and energy storage battery for normal drilling operations in oil and gas wells;

[0006] The scheduling strategy is implemented based on the existing energy management system hardware on site;

[0007] The strategy specifically includes the following steps:

[0008] Step 1: Use the sliding window method to process the previous... The power change rate characteristics of each data acquisition point were analyzed.

[0009] The power change rate characteristic includes the mean absolute value of the power change rate. and the standard deviation of the absolute value of the rate of change of power ;

[0010] ;

[0011] ;

[0012] ;

[0013] in, The value range is 5-20; and Each is within the sliding window The first data collection point The and the first Total power; For the first The and the first The absolute value of the rate of change of total power between data acquisition points; This refers to the data acquisition time interval;

[0014] Step 2: Determine the power threshold corresponding to the discharge of the energy storage battery. and power change rate threshold ;

[0015] The power threshold The calculation formula is:

[0016] ;

[0017] The power change rate threshold The calculation formula is:

[0018] ;

[0019] in, The capacity of the power grid to be constructed; This is the redundancy factor of the energy storage battery system, which is related to the response speed of the energy storage battery system, and its value ranges from 1.5 to 2. This is the power variation anomaly coefficient, with a value range of 2-3; Indicates rounding down;

[0020] Step 3, obtain Real-time data on voltage and current of mud pumps, top drive, winches, solids control system, and barracks power supply; calculations. Total power at any moment and power change rate ;

[0021] The rate of power change The calculation formula is:

[0022] ;

[0023] in, for Total power at any given moment;

[0024] Step 4: Calculate the discharge power of the energy storage battery. Specifically, it includes:

[0025] Step 41, if , Energy storage battery discharge power ;

[0026] Step 42, if , The energy storage battery discharge power is ;

[0027] Step 43, if , The energy storage battery discharge power is ;

[0028] Step 44, if , Energy storage battery discharge power ;

[0029] Step 5: If the energy storage battery does not need to be discharged, determine whether the energy storage battery needs to be charged.

[0030] If oil and gas drilling is in the stand-up operation condition, and the energy storage battery Energy storage battery charging, charging power Otherwise, the energy storage battery will not be charged;

[0031] in, This indicates the percentage of remaining charge in the energy storage battery. The safety factor for power variation during charging of energy storage batteries is set to 4-5.

[0032] The above-described solution of the present invention has at least the following beneficial effects:

[0033] (1) This scheduling strategy utilizes an energy storage battery system to ensure the power supply security for normal drilling operations of oil and gas wells under grid capacity reduction, and solves the grid tripping problem that may be caused by peak power consumption.

[0034] (2) This scheduling strategy formulates the energy storage battery charging and discharging strategy based on two indicators: power threshold and power change rate threshold. This not only meets the total power demand of normal drilling operations in oil and gas wells, but also reduces the impact of power fluctuations on the power transmission and distribution system.

[0035] (3) The power threshold and the power change rate threshold are dynamically adjusted based on the power change rate characteristics of the first 10 data collection points to solve the problem of poor coordinated power supply effect between the power grid and the energy storage battery caused by the fixed threshold. Attached Figure Description

[0036] Figure 1 This is a flowchart of a power grid and energy storage battery collaborative power supply strategy for normal drilling operations in oil and gas wells, provided by an embodiment of the present invention. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the embodiments of the present invention include, but are not limited to, the following embodiments.

[0038] The drilling rig type corresponding to this embodiment is 50dB, the power grid capacity is 1600kVA, and the data acquisition interval of the energy management system is... For 1 second, The redundancy factor of the energy storage battery system is set to 10. The value is 1.8, representing the power variation anomaly coefficient. The value is 2.5, representing the safety factor for power changes during energy storage battery charging. The value is 4.

[0039] See Figure 1 This invention provides a power grid and energy storage battery coordinated power supply strategy process for normal drilling operations in oil and gas wells, as an embodiment of the present invention. Figure 1 The strategy specifically includes the following steps:

[0040] Step 1: Analyze the power change rate characteristics of the first 10 data acquisition points using the sliding window method;

[0041] The power change rate characteristic includes the mean absolute value of the power change rate. and the standard deviation of the absolute value of the rate of change of power ;

[0042] ;

[0043] ;

[0044] ;

[0045] in, and The first one in the sliding window The and the first Total power of each data acquisition point; For the first The and the first The absolute value of the rate of change of total power between data acquisition points;

[0046] Understandably, if the power data corresponding to some existing data collection points are (1196.137, 1203.892, 1197.127, 1213.463, 1198.031, 1212.248, 1207.478, 1182.693, 1221.731, 1252.589, 1244.764, 1200.65) kW, then the power data within the sliding window will be (1197.127, 1213.463, 1198.031, 1212.248, 1207.478, 1182.693, 1221.731, 1252.589, 1244.764, 1200.65) kW, corresponding to... , ;

[0047] Step 2: Determine the power threshold corresponding to the discharge of the energy storage battery. and power change rate threshold ;

[0048] The power threshold The calculation formula is:

[0049] ;

[0050] The power change rate threshold The calculation formula is:

[0051] ;

[0052] in, Indicates rounding down;

[0053] Understandably, if , Then the power threshold Power change rate threshold ;

[0054] Step 3, obtain Real-time data on voltage and current of mud pumps, top drive, winches, solids control system, and barracks power supply; calculations. Total power at any moment and power change rate ;

[0055] The rate of power change The calculation formula is:

[0056] ;

[0057] in, for Total power at any given moment;

[0058] Step 4: Calculate the discharge power of the energy storage battery. Specifically, it includes:

[0059] Step 41, if , Energy storage battery discharge power ;

[0060] Step 42, if , The energy storage battery discharge power is ;

[0061] Step 43, if , The energy storage battery discharge power is ;

[0062] Step 44, if , Energy storage battery discharge power ;

[0063] Understandably, if , , , ,but ;

[0064] like , , , ,but ;

[0065] like , , , ,but ;

[0066] like , , , ,but ;

[0067] Step 5: If the energy storage battery does not need to be discharged, determine whether the energy storage battery needs to be charged.

[0068] If oil and gas drilling is in the stand-up operation condition, and the energy storage battery Energy storage battery charging, charging power Otherwise, the energy storage battery will not be charged;

[0069] in, This indicates the remaining percentage of charge in the energy storage battery.

[0070] Understandably, if oil and gas drilling is in the process of establishing a connection point, , , ,but .

[0071] The above embodiments are merely one example of the implementation of the present invention and are not intended to limit the scope of protection of the present invention. Any changes made based on the design principles of the present invention, or any non-creative modifications made thereon, shall fall within the scope of protection of the present invention.

Claims

1. A power supply strategy combining power grid and energy storage battery for normal drilling operations in oil and gas wells, characterized in that: The strategy specifically includes the following steps: Step 1: Use the sliding window method to process the previous... The power change rate characteristics of each data acquisition point were analyzed. The power change rate characteristic includes the mean absolute value of the power change rate. and the standard deviation of the absolute value of the rate of change of power ; ； ； ； in, The value range is 5-20; and Each is within the sliding window The first data collection point The and the first Total power; For the first The and the first The absolute value of the rate of change of total power between data acquisition points; This refers to the data acquisition time interval; Step 2: Determine the power threshold corresponding to the discharge of the energy storage battery. and power change rate threshold ; The power threshold The calculation formula is: ； The power change rate threshold The calculation formula is: ； in, The capacity of the power grid to be constructed; This is the redundancy factor of the energy storage battery system, which is related to the response speed of the energy storage battery system, and its value ranges from 1.5 to 2. This is the power variation anomaly coefficient, with a value range of 2-3; Indicates rounding down; Step 3, obtain Real-time data on voltage and current of mud pumps, top drive, winches, solids control system, and barracks power supply; calculations. Total power at any moment and power change rate ; The rate of power change The calculation formula is: ； in, for Total power at any given moment; Step 4: Calculate the discharge power of the energy storage battery. Specifically, it includes: Step 41, if , Energy storage battery discharge power ; Step 42, if , The energy storage battery discharge power is ; Step 43, if , The energy storage battery discharge power is ; Step 44, if , Energy storage battery discharge power ; Step 5: If the energy storage battery does not need to be discharged, determine whether the energy storage battery needs to be charged. If oil and gas drilling is in the stand-up operation condition, and the energy storage battery Energy storage battery charging, charging power Otherwise, the energy storage battery will not be charged; in, This indicates the percentage of remaining charge in the energy storage battery. The safety factor for power variation during charging of energy storage batteries is set to 4-5.

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