A charging and discharging scheduling method for a battery energy storage system for oil drilling operations under a power grid energy supply mode

Abstract

The present invention discloses a charging and discharging scheduling method for a battery energy storage system for oil drilling operations under a power grid energy supply mode, which belongs to the field of storage and charging technology and mainly solves the problems of high power grid erection cost and low power grid capacity utilization rate under the existing power grid energy supply mode for oil drilling operations. The charging and discharging scheduling method for a battery energy storage system for oil drilling operations under a power grid energy supply mode is to combine the power fluctuation characteristics under different drilling operation conditions. When the power grid capacity is reduced, the energy management system schedules the charging and discharging of the battery energy storage system according to different power thresholds, which can realize adaptive comprehensive management of the battery energy storage system, meet the energy demand of drilling operations under the condition of power grid capacity reduction, improve power grid utilization rate and reduce drilling costs.

Description

Technical Field

[0001] The present invention belongs to the field of storage and charging technology, and specifically relates to a charging and discharging scheduling method for a battery energy storage system for oil drilling operations under a power grid energy supply mode. Background Art

[0002] Oil drilling operations are energy-intensive links in the exploitation of oil and gas resources. In order to reduce carbon emissions from drilling operations, the energy supply mode of drilling equipment has gradually realized the transformation of "electricity (gas) replacing oil". However, in order to cope with the possible peak power, the capacity applied for when the power grid was erected was large, resulting in very low grid utilization (about 30%-40%) under normal drilling operations. The battery energy storage system can effectively store the power of the grid when it is under low load, and release it in time when the power of the drilling operation suddenly changes, so as to meet the energy supply demand of the drilling operation under the condition of grid capacity reduction, and ensure the safety of the drilling operation while reducing the drilling cost. However, the reasonable charging and discharging scheduling of the battery energy storage system is the key to ensure that the energy consumption of the drilling operation is guaranteed, the charging and discharging balance of the battery energy storage system, and to avoid frequent charging and discharging of the battery energy storage system as much as possible. First, unreasonable charging and discharging of the battery energy storage system may cause the battery energy storage system to be unable to discharge when the power of the drilling operation suddenly changes, causing the grid to trip due to impact. Secondly, unreasonable charging and discharging of the battery energy storage system may cause the discharged power to be unable to be replenished in time, resulting in the power of the battery energy storage system to continue to decline, and ultimately leading to the inability to meet the energy supply demand. Finally, frequent charging and discharging of battery energy storage systems will shorten their service life, resulting in the inability to recover investment costs. Therefore, a new battery energy storage system charging and discharging scheduling method is urgently needed, which can effectively combine the power fluctuation characteristics of drilling operations, and realize the hybrid power supply of the grid and battery energy storage system to the drilling operation under the condition of reducing the grid capacity, so as to ensure the safety of drilling operations while reducing drilling costs.

[0003] Compared with the "Energy Storage System and Energy Scheduling Control Method of Energy Storage System" disclosed in Chinese Patent Application Publication No. CN118174340A, it involves the field of storage and charging technology to solve the problems of single energy scheduling mode, unsatisfactory energy utilization rate and economic benefits. This method makes charging and discharging scheduling decisions for the energy storage system by comprehensively analyzing the current peak, flat and valley time periods, the power request of the electric pile system and the current SOC value of the battery cluster. The similarities between this method and the present method are to make decisions on the charging and discharging scheduling of the energy storage system by collecting some parameters, but the differences from the present method are: 1. The main purpose of this method is to improve economic benefits through "peak and valley arbitrage", while the present invention is to avoid shocks after reducing the capacity of the power grid; 2. The scheduling logic of this method is more complex and time-consuming, and it is difficult to meet the instantaneous power changes in oil drilling operations; 3. This method does not consider the impact of frequent charging and discharging of the energy storage system on its service life, and mainly focuses on economic optimization without considering the degradation cost of the energy storage system. Summary of the invention

[0004] The purpose of the present invention is to provide a charging and discharging scheduling method for a battery energy storage system for oil drilling operations under a power grid energy supply mode, which mainly solves the problem of reasonable charging and discharging scheduling of a battery energy storage system under a power grid capacity reduction condition and meets the energy demand of oil drilling operations.

[0005] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0006] A method for scheduling the charging and discharging of a battery energy storage system for oil drilling operations in a grid-powered mode, the method relying on a set of existing energy management system hardware on site to implement scheduling;

[0007] The charging and discharging scheduling method determines the charging and discharging state of the battery energy storage system based on the real-time collected oil drilling power and well depth change data;

[0008] The charging and discharging scheduling method comprises the following steps:

[0009] Step 1, the energy management system collects voltage and current data and well depth change data of each power consumption unit, and the power consumption units include winch, mud pump, top drive, solid control system and barracks;

[0010] Step 2: The energy management system calculates the real-time total power P of the oil drilling operation based on the collected voltage and current data. 实 ;

[0011] Step 3, determining whether the battery energy storage system is discharging and the corresponding discharge power, specifically includes:

[0012] Step 3.1: If the drilling operation is in a normal drilling condition with the drilling depth gradually increasing, the energy management system calculates the average power P every 5 minutes. 平 ;

[0013] If the single stand drilling depth H < 24m and P 实 >P 平 +α, battery energy storage system discharge, discharge power P 放 =P 实 -P 平 When P 实 Decline and P 实 <P 平 +0.5*α, the battery energy storage system stops discharging;

[0014] If the drilling depth of a single stand is 24m≤H<27m, the battery energy storage system maintains the rated power P 放 =γ discharge, until the single root drilling depth H = 27m stops discharging;

[0015] Step 3.2: If the drilling operation is in other working conditions other than normal drilling, when P 实 >0.7*P网 , the battery energy storage system discharges, and the discharge power is P 放 =P 实 -0.6*P 网 When P 实 Decline and P 实 <0.6*P 网 , the battery energy storage system stops discharging;

[0016] Step 4: Determine whether the battery energy storage system is charged and the corresponding charging power, specifically:

[0017] If the drilling operation is connected to the rooting condition, the battery energy storage system will charge, and the charging power P 充 Power P provided by the power grid 网 , Real-time total power P of oil drilling operation 实 Together we determined that P 充 =P 网 -P 实 -300kW.

[0018] Furthermore, the average power P 平 is the average power value starting from the single root drilling depth H = 0m, the average power P 平 It is updated every 5 minutes to ensure that the discharge threshold of the battery energy storage system adapts to the power fluctuations of normal drilling operations.

[0019] Furthermore, the value of α is determined by the drilling rig model and the well type, and ranges from 200-400kW.

[0020] Furthermore, the value of γ is determined by the type of battery energy storage system and ranges from 200-500kW.

[0021] The advantages and beneficial effects of the present invention are:

[0022] (1) This method fully considers the power fluctuation differences under different drilling operation conditions and sets different battery energy storage system charge and discharge scheduling thresholds, which greatly leverages the “peak shaving and valley filling” advantage of the battery energy storage system and avoids the impact on the power grid caused by reducing the power grid capacity.

[0023] (2) This method realizes the adaptive power fluctuation of the discharge threshold of the battery energy storage system under normal drilling operation conditions, which can be used for drilling operations of different types of drilling rigs and different well depths, and can also achieve the balance of charge and discharge of the battery energy storage system;

[0024] (3) This method fully considers the impact of frequent charging and discharging of the battery energy storage system on its service life. Frequent charging and discharging of the battery energy storage system will affect its performance and shorten its service life. On the basis of ensuring that the power grid and the battery energy storage system jointly supply energy to meet the drilling power demand, the number of times the battery energy storage system is charged and discharged is reduced as much as possible to extend its service life;

[0025] (4) This method can reduce drilling operation costs and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An embodiment of the present invention provides a charging and discharging scheduling process for a battery energy storage system for oil drilling operations under a power grid power supply mode.

[0027] Figure 2 The total power fluctuation curve under typical working conditions of oil drilling operations provided by the embodiment of the present invention.

[0028] Figure 3 The embodiments of the present invention provide power grid and battery energy storage system output power distribution.

[0029] Figure 4 This is a comparison of grid utilization provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and examples. The implementation methods of the present invention include but are not limited to the following examples.

[0031] Example

[0032] See also Figures 1 to 4

[0033] The drilling rig type used in this implementation is a 50LDB drilling rig, the well type is a vertical well, the well depth is 4000m, the battery energy storage system cell is lithium iron phosphate, the rated power is 1000kW, and the rated power is 978kWh. α is 200kW, and γ is 400kW. The grid capacity before the battery energy storage system is used is 2500kVA, and the grid capacity after the battery energy storage system is used is 1600kVA.

[0034] A method for charging and discharging scheduling of a battery energy storage system for oil drilling operations under a power grid energy supply mode, specifically comprising the following steps:

[0035] Step 1, the energy management system collects voltage and current data and well depth change data of each power consumption unit, and the power consumption units include winch, mud pump, top drive, solid control system and barracks;

[0036] Step 2: The energy management system calculates the real-time total power P of the drilling operation based on the collected voltage and current data. 实 ;

[0037] Step 3, determining whether the battery energy storage system is discharging and the corresponding discharge power;

[0038] Step 3.1: If the drilling operation is in a normal drilling condition with the drilling depth gradually increasing, the energy management system calculates the average power P every 5 minutes. 平 ;

[0039] If the single stand drilling depth H < 24m and P 实 >P 平 +200kW, the battery energy storage system discharges, and the discharge power P 放 =P 实 -P 平 When P 实 Decline and P 实 <P 平 +100kW, the battery energy storage system stops discharging;

[0040] It is understandable that if H = 19m, P 平 =1060kW, P 实 =1330kW, then P 放 =270kW; when P 实 Decline and P 实 =1150kW, P 放 =0kW;

[0041] If the drilling depth of a single stand is 24m≤H<27m, the battery energy storage system maintains the rated power P 放 =400kW discharge, until the single stand drilling depth H = 27m stops discharging;

[0042] It is understandable that if H = 26m, P 放 =400kW;

[0043] Step 3.2: If the drilling operation is in other working conditions other than normal drilling, when P 实 >0.7*P 网 , the battery energy storage system discharges, and the discharge power is P 放 =P 实 -0.6*P 网 When P 实 Decline and P 实 <0.6*P 网 , the battery energy storage system stops discharging;

[0044] It is understandable that if P 实 =1220kW, then P 放 =260kW; when P 实 Decline and P 实 =930kW, P 放 =0kW;

[0045] Step 4: Determine whether the battery energy storage system is charged and the corresponding charging power, specifically:

[0046] If the drilling operation is connected to the rooting condition, the battery energy storage system will charge, and the charging power P 充 Power P provided by the power grid 网 , Real-time total power P of oil drilling operation 实 Together we determined that P 充 =P 网 -P 实 -300kW;

[0047] It is understandable that if P 实 =480kW, then P 放 =820kW.

[0048] Figure 2 The figure shows the total power fluctuation curve under typical working conditions of oil drilling operation. The dispatching strategy of the present invention is used to obtain the output power distribution result of the power grid and the battery energy storage system (see Figure 3 ). The battery energy storage system was discharged 3 times during normal drilling of a single stand and charged once during the stand connection process. During the drilling operation, the battery energy storage system was discharged 0 times because the peak power was less than 1120kW.

[0049] The effect of grid capacity utilization before and after the battery energy storage system in this embodiment participates in the entire drilling cycle operation is shown in the attached figure. Figure 4 As shown in the figure, the average utilization rate of the power grid has increased by more than 50% after the use of the battery energy storage system. The battery energy storage system with a rated power of 1000kW, a rated capacity of 978kWh, and a cell type of lithium iron phosphate is estimated to recover the investment cost in 4.5 years.

[0050] 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 method for charging and discharging scheduling of a battery energy storage system for oil drilling operations under a power grid energy supply mode, characterized in that: The charging and discharging scheduling method determines the charging and discharging state of the battery energy storage system based on the real-time collected oil drilling power and well depth change data; The charging and discharging scheduling method comprises the following steps: Step 1, the energy management system collects voltage and current data and well depth change data of each power consumption unit, and the power consumption units include winch, mud pump, top drive, solid control system and barracks; Step 2: The energy management system calculates the real-time total power P of the oil drilling operation based on the collected voltage and current data. 实 ; Step 3, determining whether the battery energy storage system is discharging and the corresponding discharge power, specifically includes: Step 3.1: If the drilling operation is in a normal drilling condition with the drilling depth gradually increasing, the energy management system calculates the average power P every 5 minutes. 平 ; If the single stand drilling depth H < 24m and P 实 >P 平 +α, battery energy storage system discharge, discharge power P 放 =P 实 -P 平 When P 实 Decline and P 实 <P 平 +0.5*α, the battery energy storage system stops discharging; If the drilling depth of a single stand is 24m≤H<27m, the battery energy storage system maintains the rated power P 放 =γ discharge, until the single root drilling depth H = 27m stops discharging; The average power P 平 It is the average power value starting from the single stand drilling depth H = 0m; The value of α is determined by the drilling rig model and well type, and ranges from 200-400kW; The value of γ is determined by the type of battery energy storage system and ranges from 200-500kW; Step 3.2: If the drilling operation is in other working conditions other than normal drilling and not stand connection, when P 实 >0.7*P 网 , the battery energy storage system discharges, and the discharge power is P 放 =P 实 -0.6*P 网 When P 实 Decline and P 实 <0.6*P 网 , the battery energy storage system stops discharging; Step 4, determining whether the battery energy storage system is charged and the corresponding charging power, specifically includes: If the drilling operation is in the root connection condition, the battery energy storage system is charged, and the charging power P 充 Power P provided by the power grid 网 , Real-time total power P of oil drilling operation 实 Together we determined that P 充 =P 网 -P 实 -300kW.

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