A charging and discharging scheduling strategy for energy storage batteries for oil and gas drilling operations

Abstract

The present invention discloses a charging and discharging scheduling strategy for energy storage batteries used in oil and gas drilling operations, which belongs to the field of storage and charging technology and mainly solves the problem of safe energy supply for oil and gas drilling operations under the condition of power grid capacity reduction. The scheduling strategy relies on a set of multi-energy complementary integrated energy management system, combined with the power mutation characteristics of energy-consuming equipment in oil and gas drilling operations, to reasonably control the charging and discharging of energy storage batteries, and realize the comprehensive management of the mixed energy supply of power grids and energy storage batteries to oil and gas drilling operations, which not only reduces the cost of power grid infrastructure construction and improves the utilization rate of power grid capacity, but also ensures energy supply safety.

Description

Technical Field

[0001] The present invention belongs to the field of storage and charging technology, and in particular, relates to a charging and discharging scheduling strategy for energy storage batteries used in oil and gas drilling operations. Background Art

[0002] The "electricity replacing oil" energy supply mode for oil and gas drilling operations was proposed to solve the problems of high oil consumption and high carbon emissions in traditional energy supply methods, and has achieved remarkable results. However, since the power grid construction capacity is determined based on the peak power of oil and gas drilling operations, there are problems such as low power grid capacity utilization and high power grid infrastructure construction costs. In recent years, electrochemical energy storage batteries have been proposed to be used for mixed energy supply to energy-consuming equipment in oil and gas drilling operations with the power grid. Based on the "peak shaving and valley filling" mechanism of energy storage batteries, the impact of load fluctuations in oil and gas drilling operations on the power grid is reduced to ensure operational safety. The charging and discharging scheduling of energy storage batteries is closely related to the load fluctuations in oil and gas drilling operations. A reasonable charging and discharging scheduling strategy for energy storage batteries can not only greatly reduce the capacity of the power grid and ensure operational safety, but also avoid frequent charging and discharging of energy storage batteries and extend the service life of energy storage batteries. However, the load of oil and gas drilling operations presents irregular fluctuation characteristics, and sudden load changes are the main cause of power grid shocks. Therefore, there is an urgent need for a new energy storage battery charging and discharging strategy for oil and gas drilling operations that effectively combines the load fluctuation characteristics of oil and gas drilling operations, rationally schedules the charging and discharging of energy storage batteries, and ensures safe energy supply when the power grid is reduced in capacity. Summary of the invention

[0003] The purpose of the present invention is to provide a storage battery charging and discharging scheduling strategy for oil and gas drilling operations to solve the above problems and technical requirements. The technical solution of the present invention is as follows:

[0004] A charging and discharging scheduling strategy for energy storage batteries used in oil and gas drilling operations;

[0005] The scheduling strategy relies on a set of multi-energy complementary integrated energy management system hardware already on site to implement scheduling;

[0006] The scheduling strategy adjusts the charging and discharging state and charging and discharging power of the energy storage battery according to the total power and power change rate of the energy-consuming equipment in the oil and gas drilling operation;

[0007] The scheduling strategy includes the following steps:

[0008] Step 1: Obtain the voltage and current data of energy-consuming equipment in oil and gas drilling operations and calculate the total power consumption P 总 (t);

[0009] Step 2, calculating the total power consumption change rate α caused by load fluctuation;

[0010] The calculation expression of the change rate α is:

[0011]

[0012] Among them, t0 is the data collection interval of the energy management system.

[0013] Step 3, determining whether the energy storage battery is discharged and the discharge power, including:

[0014] Step 3.1: If the energy storage battery is not discharged at time t-t0, then when P 总 (t)≥min[(P 网 -η*t0*α),P 界 ], the energy storage battery is discharged, the discharge power P 放 =max[(P 总 (t)-P 界 +ε), α], otherwise the energy storage battery still does not discharge;

[0015] Step 3.2: If the energy storage battery is in a discharge state at time t-t0, then when α<ε and P 总 (t) <P 界 -ε, the energy storage battery changes from the discharge state to the stop discharge state, otherwise the energy storage battery continues to discharge;

[0016] The P 界 The calculation expression is

[0017]

[0018] Among them, P 网 is the grid erection capacity; η is an integer greater than zero, obtained from field experience; ε is determined by the well type and has a value range of 150kW-250kW;

[0019] Step 4, determining whether the energy storage battery is charged and the charging power, including:

[0020] If the energy storage battery does not need to be discharged at time t, when the oil and gas drilling operation is in the stop period and SOC ≤ 85%, the energy storage battery is charged, and the charging power P 充 (t) = P 界 -P 总 (t), otherwise the energy storage battery does not need to be charged;

[0021] Among them, SOC is the remaining power of the energy storage battery.

[0022] The above solution of the present invention includes at least the following advantages and beneficial effects:

[0023] (1) This scheduling strategy fully considers the power mutation characteristics of oil and gas drilling operations. While setting the critical load power corresponding to the energy storage battery discharge, it also dynamically adjusts the energy storage battery discharge conditions according to the power mutation rate, giving full play to the "peak shaving and valley filling" advantage of the energy storage battery and ensuring the energy safety of oil and gas drilling operations;

[0024] (2) This scheduling strategy is applicable to any working conditions of oil and gas drilling operations, such as drilling down, normal drilling, coring drilling, and pulling out, and can be used for any drilling parameters such as well type and well depth, and has universal adaptability;

[0025] (3) This scheduling strategy fully considers the possible impact of frequent discharge of energy storage batteries on their service life. Based on the analysis of the power change rate, the load power change is evaluated, the charge and discharge status of the energy storage battery is determined, and the number of unnecessary discharges of the energy storage battery is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a flow chart of a charging and discharging scheduling strategy for energy storage batteries used in oil and gas drilling operations provided by an embodiment of the present invention.

[0027] Figure 2 It is the total power consumption under typical working conditions of oil and gas drilling operations provided by an embodiment of the present invention.

[0028] Figure 3 It is the rate of change of total electric power under typical working conditions of oil and gas drilling operations provided by the embodiments of the present invention.

[0029] Figure 4 The invention provides an embodiment of the invention for distributing power output of a power grid and a storage battery. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the embodiments of the present invention include but are not limited to the following embodiments.

[0031] The drilling rig type corresponding to this embodiment is 50LDB, the well type is vertical well, the maximum well depth is 4000m, and the installed power grid capacity is 1600kVA. According to field experience, η is taken as 2 and ε is taken as 150kW. The energy management system collects data every 1s.

[0032] See also Figure 1 , is a schematic diagram of a storage battery charging and discharging scheduling strategy for oil and gas drilling operations provided by an embodiment of the present invention. Figure 1 As shown, the scheduling strategy includes the following steps:

[0033] Step 1: Obtain the voltage and current data of energy-consuming equipment in oil and gas drilling operations and calculate the total power consumption P 总 (t);

[0034] Step 2, calculating the total power consumption change rate α caused by load fluctuation;

[0035] α=P 总 (t)-P 总 (t-1)

[0036] Step 3, determining whether the energy storage battery is discharged and the discharge power, including:

[0037] Step 3.1: If the energy storage battery is not discharged at time t-1, then when P 总 (t)≥min[(1600-2*α),1300]kW, the energy storage battery is discharged, the discharge power P 放 =max[(P 总 (t)-1150), α]kW, otherwise the energy storage battery still does not discharge;

[0038] It is understandable that if there is no discharge at time t-1, P 总 (t-1) = 1240 kW, P 总 (t) = 1350kW, then P 放 =200kW; if there is no discharge at time t-1, P 总 (t-1) = 1240 kW, P 总 (t) = 1290kW, then P 放 =0kW;

[0039] Step 3.2: If the energy storage battery is in a discharge state at time t-1, then when α<150kW and P 总 (t) <1150kW, the energy storage battery changes from the discharge state to the stop discharge state, otherwise the energy storage battery continues to discharge;

[0040] It is understandable that if the time t-1 is in the discharge state, P 总 (t-1) = 1290 kW, P 总 (t) = 1140kW, then P 放 =0kW;

[0041] Step 4, determining whether the energy storage battery is charged and the charging power, including:

[0042] If the energy storage battery does not need to be discharged at time t, when the oil and gas drilling operation is in the stop period and SOC ≤ 85%, the energy storage battery is charged, and the charging power P 充 (t) = (1300-P 总 (t))kW, otherwise the energy storage battery does not need to be charged;

[0043] It is understandable that if there is no need to discharge at time t and the drilling is stopped, SOC = 60%, P 总 (t)=340kW,P 充 =960kW;

[0044] Among them, SOC is the remaining power of the energy storage battery.

[0045] See also Figure 2 and Figure 3 , which is a total power consumption and power change rate under typical working conditions of oil and gas drilling operations provided by an embodiment of the present invention. The dispatching strategy provided by the present invention is used to obtain the output power distribution of the power grid and the energy storage battery. The distribution result is as follows: Figure 4 The energy storage battery was discharged a total of 3 times during the 1-hour oil and gas drilling operation, and the grid output power after using the energy storage battery was less than 1300kW.

[0046] The above embodiment is only one of the embodiments of the present invention and is not intended to limit the protection scope of the present invention. Any changes made by adopting the design principle of the present invention and performing non-creative work on this basis should fall within the protection scope of the present invention.

Claims

1. A storage battery charging and discharging scheduling strategy for oil and gas drilling operations, characterized in that: The charging and discharging scheduling strategy adjusts the charging and discharging state and charging and discharging power of the energy storage battery according to the total power and power change rate of the energy-consuming equipment in the oil and gas drilling operation; The scheduling strategy includes the following steps: Step 1: Obtain the voltage and current data of energy-consuming equipment in oil and gas drilling operations and calculate the total power consumption P 总 (t); Step 2, calculating the total power consumption change rate α caused by load fluctuation; The calculation expression of the change rate α is: Among them, t0 is the data collection interval of the energy management system; Step 3, determining whether the energy storage battery is discharged and the discharge power, including: Step 3.1: If the energy storage battery is not discharged at time t-t0, then when P 总 (t)≥min[(P 网 -η*t0*α), P 界 ], the energy storage battery is discharged, the discharge power P 放 =max[(P 总 (t)-P 界 +ε), α], otherwise the energy storage battery still does not discharge; Step 3.2: If the energy storage battery is in a discharge state at time t-t0, then when α<ε and P 总 (t) <P 界 -ε, the energy storage battery changes from the discharge state to the stop discharge state, otherwise the energy storage battery continues to discharge; The P 界 The calculation expression is Among them, P 网 is the grid erection capacity; η is an integer greater than zero, obtained from field experience; ε is determined by the well type and has a value range of 150kW-250kW; Step 4, determining whether the energy storage battery is charged and the charging power, including: If the energy storage battery does not need to be discharged at time t, when the oil and gas drilling operation is in the stop period and SOC ≤ 85%, the energy storage battery is charged, and the charging power P 充 (t) = P 界 -P 总 (t), otherwise the energy storage battery does not need to be charged; Among them, SOC is the remaining power of the energy storage battery.

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