CN107169684A - Commingling production oil reservoir determines the development behavior computational methods under liquid measure working condition - Google Patents
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Abstract
本发明公开了一种多层合采油藏定液量生产条件下的开发动态计算方法，涉及油田开发技术领域，该方法包括：步骤1，已知各小层储层物性和流体参数；步骤2，已知n时刻小层平均含水饱和度，求出出口端含水饱和度，由相渗曲线拟和分流量方程，进而求得油水相对渗透率和含水率；步骤3，已知总产液量和n时刻油水相对渗透率，迭代试算求得定液量生产条件下，n时刻对应生产压差ΔPn；步骤4，由广义达西定律，求得n时刻产液量，由含水率fw n(Sw2)，进而确定产水量和产油量；步骤5，根据物质平衡原理，得到n+1时刻平均含水饱和度步骤6，重复(2)‑(5)，直到n+1＝N，计算结束。本发明计算了多层合采定产液量生产开发动态，可为油田生产提供指导。
The invention discloses a development dynamic calculation method under the condition of constant liquid volume production of multi-layer co-production oil reservoir, and relates to the technical field of oil field development. 2. Knowing the average water saturation of the small layer at time n, calculate the water saturation at the outlet, fit the phase permeability curve to the partial flow equation, and then obtain the oil-water relative permeability and water content; step 3, the total liquid production is known and the oil-water relative permeability at time n, iterative trial calculation to obtain the production pressure difference ΔP n corresponding to time n under the condition of constant liquid production; step 4, according to the generalized Darcy's law, the liquid production rate at time n is obtained, and the water cut f w n (S w2 ), and then determine the water production and oil production; Step 5, according to the material balance principle, get the average water saturation at time n+1 Step 6, repeat (2)-(5) until n+1=N, and the calculation ends. The invention calculates the production and development dynamics of multi-layer combined production with fixed fluid production, and can provide guidance for oil field production.
Description
技术领域technical field
本发明涉及油田开发技术领域，特别涉及一种多层合采油藏定液量生产条件下的开发动态计算方法。The invention relates to the technical field of oil field development, in particular to a dynamic calculation method for development under the condition of constant liquid volume production in multi-layer co-production oil reservoirs.
背景技术Background technique
我国陆相沉积的砂岩油藏，纵向油层多，为减少开采成本，普遍采用多层合采进行开发。多层合采定液量生产的油藏，生产压差以及各小层的产油量、产水量是油藏动态分析的重要参数，但通常难以获得。本发明在考虑注水启动压力梯度的基础上，采用迭代试算法获得不同时刻与给定产液量相匹配的生产压差，从而进一步获得不同时刻各小层的产油量、产水量，为油田实际生产提供指导。Sandstone reservoirs deposited in continental facies in my country have many vertical oil layers. In order to reduce production costs, multi-layer commingled production is generally used for development. For reservoirs produced by multi-layer combined production with constant liquid volume, the production pressure difference and the oil production and water production of each small layer are important parameters for reservoir dynamic analysis, but they are usually difficult to obtain. On the basis of considering the start-up pressure gradient of water injection, the present invention adopts the iterative trial algorithm to obtain the production pressure difference matching the given liquid production at different times, thereby further obtaining the oil production and water production of each small layer at different times, which is a great contribution to the oil field. Actual production provides guidance.
发明内容Contents of the invention
本发明所要解决的技术问题是提供一种多层合采油藏定液量生产条件下的开发动态计算方法，可以实现多层合采油藏定液量生产条件下，不同时刻油井生产压差及各小层产油量和产水量。考虑注水启动压力梯度，通过寻找不同时刻与给定液量相匹配的生产压差，从而计算不同时刻各小层的产油量和产水量。The technical problem to be solved by the present invention is to provide a development dynamic calculation method under the production condition of constant liquid volume of multi-layer co-production oil reservoir, which can realize the production pressure difference of oil wells at different times under the condition of constant liquid volume production of multi-layer co-production oil reservoir. And the oil production and water production of each sublayer. Considering the start-up pressure gradient of water injection, the oil production and water production of each small layer at different times can be calculated by finding the production pressure difference that matches the given liquid volume at different times.
为实现上述目的，本发明提供以下的技术方案：该多层合采油藏定液量生产条件下的开发动态计算方法的步骤如下：In order to achieve the above object, the present invention provides the following technical solutions: the steps of the dynamic calculation method for development under the condition of constant liquid volume production of the multi-layer co-production oil reservoir are as follows:
(1)根据测井解释结果、高压物性分析报告、生产动态资料等，搜集各小层储层物性和流体参数；(1) Collect the physical and fluid parameters of each sub-layer reservoir according to the logging interpretation results, high-pressure physical property analysis reports, production dynamic data, etc.;
(2)已知n时刻小层平均含水饱和度，求出出口端含水饱和度，由相渗曲线拟和分流量方程，进而求得油水相对渗透率和含水率；(2) Given the average water saturation of the small layer at time n, the water saturation at the outlet end is calculated, and the relative permeability and water content of oil and water are obtained by fitting the phase permeability curve to the partial flow equation;
(3)已知总产液量和n时刻油水相对渗透率，迭代试算求得与给定单井总产液量相匹配的生产压差ΔPn；(3) Knowing the total liquid production rate and the oil-water relative permeability at time n, obtain the production pressure difference ΔP n matching the total liquid production rate of a given single well through iterative trial calculation;
(4)由广义达西定律，求得n时刻产液量，再由n时刻的含水率fw n(Sw2)，进而确定产水量和产油量；(4) According to the generalized Darcy's law, the liquid production rate at time n is obtained, and then the water production rate and oil production rate are determined according to the water cut f w n (S w2 ) at time n;
(5)根据物质平衡原理，求得n+1时刻各小层平均含水饱和度；(5) According to the principle of material balance, obtain the average water saturation of each small layer at time n+1;
(6)重复步骤(2)-(5)，直到n+1＝N，计算结束。(6) Steps (2)-(5) are repeated until n+1=N, and the calculation ends.
优选的，所述步骤(1)中，多个储层物性和流体参数，包括含有面积、储层有效厚度、油层宽度、绝对渗透率、孔隙度、地下原油粘度、目前平均含水饱和度等，根据注水启动压力梯度与绝对渗透率关系统计规律G＝55.624×K-1.7145，得到注水启动压力梯度。Preferably, in the step (1), multiple reservoir physical and fluid parameters, including containing area, effective reservoir thickness, oil layer width, absolute permeability, porosity, underground crude oil viscosity, current average water saturation, etc., According to the statistical rule G=55.624×K -1.7145 of the relationship between water injection starting pressure gradient and absolute permeability, the water injection starting pressure gradient is obtained.
优选的，所述步骤(3)中，已知n时刻根据广义达西定律，考虑注水启动压力梯度的小层产液量为已知多层合采油藏定产液量生产的单井总产液量，迭代试算n时刻生产压差ΔPn，直到满足各小层产液量之和与层系给定的产液量相等。Preferably, in the step (3), known n moment According to the generalized Darcy's law, the liquid production rate of the small layer considering the water injection start-up pressure gradient is Knowing the total liquid production rate of a single well produced by the fixed liquid production rate of the multi-layer co-production reservoir, iteratively calculate the production pressure difference ΔP n at time n until the sum of the liquid production rates of each small layer and the given liquid production rate of the layer system are met equal.
优选的，所述步骤(4)中，由步骤(3)已知n时刻与给定产液量相匹配的生产压差ΔPn，依据广义达西定律，求得各小层的产液量，再由步骤(2)中各小层n时刻含水率fw n(Sw2)，求得n时刻的产油量和产水量。Preferably, in the step (4), the production pressure difference ΔP n matching the given liquid production rate at time n is known from step (3), and the liquid production rate of each small layer is obtained according to the generalized Darcy's law , and then from the water cut f w n (S w2 ) of each small layer at time n in step (2), the oil production rate and water production rate at time n are obtained.
优选的，所述步骤(5)中，根据物质平衡原理，n到n+1时刻产油量引起的平均含油饱和度减少量，与平均含水饱和度增加量相等，由体积法求得n+1时刻平均含水饱和度。Preferably, in the step (5), according to the material balance principle, the average oil saturation decrease caused by the oil production from n to n+1 is equal to the average water saturation increase, and the volumetric method Obtain the average water saturation at time n+1.
优选的，所述步骤(6)中，重复步骤(2)-(5)，直到n+1＝N，计算结束。Preferably, in the step (6), the steps (2)-(5) are repeated until n+1=N, and the calculation ends.
采用以上技术方案的有益效果是：该多层合采油藏定液量生产条件下的开发动态计算方法考虑了纵向多层合采油藏，在定产液量生产条件下，注水启动压力梯度对产油量的影响；同时，考虑了生产过程中油水总渗流阻力变化，随着生产时间增大，含水率增加，油水总渗流阻力减小。该方法计算得到多层合采油藏定产液量生产条件下，不同时刻的产油量、产水量、对应生产压差等重要动态开发参数，可为油田实际生产提供指导。The beneficial effect of adopting the above technical scheme is: the development dynamic calculation method of the multi-layer co-production oil reservoir under the production condition of constant liquid volume takes into account the vertical multi-layer co-production oil reservoir. The impact on oil production; at the same time, considering the change of total oil-water seepage resistance during the production process, as the production time increases, the water content increases and the total oil-water seepage resistance decreases. This method calculates important dynamic development parameters such as oil production, water production, and corresponding production pressure difference at different times under the condition of constant liquid production in multi-layer co-production reservoirs, which can provide guidance for actual oilfield production.
附图说明Description of drawings
下面结合附图对本发明的具体实施方式作进一步详细的描述。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
图1是本发明的多层合采油藏定液量生产条件下的开发动态计算方法物理模型图；Fig. 1 is the physical model diagram of the development dynamic calculation method under the production condition of constant liquid volume of multi-layer co-production oil reservoir of the present invention;
图2是本发明的多层合采油藏定液量生产条件下的开发动态计算方法的流程图；Fig. 2 is the flow chart of the development dynamic calculation method under the production condition of constant liquid volume of multi-layer co-production oil reservoir of the present invention;
图3是本发明的具体实施例中多层合采油藏定液量生产条件下各小层开发动态图。Fig. 3 is a dynamic diagram of the development of each small layer under the production condition of constant liquid volume in a multi-layer co-production oil reservoir in a specific embodiment of the present invention.
具体实施方式detailed description
下面结合附图详细说明本发明一种多层合采油藏定液量生产条件下的开发动态计算方法的优选实施方式。A preferred embodiment of the development dynamic calculation method of the present invention under the condition of constant liquid volume production in multi-layer co-production oil reservoirs will be described in detail below in conjunction with the accompanying drawings.
图1、图2和图3出示本发明一种多层合采油藏定液量生产条件下的开发动态计算方法的具体实施方式：Fig. 1, Fig. 2 and Fig. 3 show the specific embodiment of the development dynamic calculation method under a kind of multi-layer co-production oil reservoir constant liquid quantity production condition of the present invention:
该多层合采油藏定液量生产条件下的开发动态计算方法的步骤如下：The steps of the development dynamic calculation method under the condition of constant liquid volume production of the multi-layer co-production oil reservoir are as follows:
(1)根据测井解释结果、高压物性分析报告、生产动态资料等，搜集各小层储层物性和流体参数；(1) Collect the physical and fluid parameters of each sub-layer reservoir according to the logging interpretation results, high-pressure physical property analysis reports, production dynamic data, etc.;
(2)已知n时刻小层平均含水饱和度，求出出口端含水饱和度，由相渗曲线拟和分流量方程，进而求得油水相对渗透率和含水率；(2) Given the average water saturation of the small layer at time n, the water saturation at the outlet end is calculated, and the relative permeability and water content of oil and water are obtained by fitting the phase permeability curve to the partial flow equation;
(3)已知总产液量和n时刻油水相对渗透率，迭代试算求得与给定单井总产液量相匹配的生产压差ΔPn；(3) Knowing the total liquid production rate and the oil-water relative permeability at time n, obtain the production pressure difference ΔP n matching the total liquid production rate of a given single well through iterative trial calculation;
(4)由广义达西定律，求得n时刻产液量，再由n时刻的含水率fw n(Sw2)，进而确定产水量和产油量；(4) According to the generalized Darcy's law, the liquid production rate at time n is obtained, and then the water production rate and oil production rate are determined according to the water cut f w n (S w2 ) at time n;
(5)根据物质平衡原理，求得n+1时刻各小层平均含水饱和度；(5) According to the principle of material balance, obtain the average water saturation of each small layer at time n+1;
(6)重复步骤(2)-(5)，直到n+1＝N，计算结束。(6) Steps (2)-(5) are repeated until n+1=N, and the calculation ends.
步骤(1)中，多个储层物性和流体参数，包括含有面积、储层有效厚度、油层宽度、绝对渗透率、孔隙度、地下原油粘度、目前平均含水饱和度等，根据注水启动压力梯度与绝对渗透率关系统计规律G＝55.624×K-1.7145，得到注水启动压力梯度。In step (1), multiple reservoir physical and fluid parameters, including containing area, effective reservoir thickness, oil layer width, absolute permeability, porosity, underground crude oil viscosity, current average water saturation, etc., are calculated according to the water injection start pressure gradient The statistical law of the relationship with the absolute permeability is G=55.624×K -1.7145 , and the starting pressure gradient of water injection is obtained.
步骤(3)中，已知n时刻根据广义达西定律，考虑注水启动压力梯度的小层产液量为已知多层合采油藏定产液量生产的单井总产液量，迭代试算n时刻生产压差ΔPn，直到满足各小层产液量之和与层系给定的产液量相等。In step (3), the known time n According to the generalized Darcy's law, the liquid production rate of the small layer considering the water injection start-up pressure gradient is Knowing the total liquid production rate of a single well produced by the fixed liquid production rate of the multi-layer co-production reservoir, iteratively calculate the production pressure difference ΔP n at time n until the sum of the liquid production rates of each small layer and the given liquid production rate of the layer system are met equal.
步骤(4)中，由步骤(3)已知n时刻与给定产液量相匹配的生产压差ΔPn，依据广义达西定律，求得各小层的产液量，再由步骤(2)中各小层n时刻含水率fw n(Sw2)，求得n时刻的产油量和产水量。In step (4), the production pressure difference ΔP n matching the given liquid production rate at time n is known from step (3), and the liquid production rate of each small layer is obtained according to the generalized Darcy's law, and then the step ( 2) The water content f w n (S w2 ) of each small layer at time n is calculated to obtain the oil production rate and water production rate at time n.
步骤(5)中，根据物质平衡原理，n到n+1时刻产油量引起的平均含油饱和度减少量，与平均含水饱和度增加量相等，由体积法求得n+1时刻平均含水饱和度。In step (5), according to the principle of material balance, the decrease in average oil saturation caused by oil production at time n to n+1 is equal to the increase in average water saturation. Obtain the average water saturation at time n+1.
步骤(6)中，重复步骤(2)-(5)，直到n+1＝N，计算结束In step (6), repeat steps (2)-(5) until n+1=N, the calculation ends
图2为本发明的多层合采油藏定液量生产条件下的开发动态计算方法的流程图，包括步骤1，已知各小层储层物性和流体参数；步骤2，已知n时刻小层平均含水饱和度，求出出口端含水饱和度，由相渗曲线拟和分流量方程，进而求得油水相对渗透率和含水率；步骤3，已知总产液量和n时刻油水相对渗透率，迭代试算求得定液量生产条件下，n时刻对应生产压差ΔPn；步骤4，由广义达西定律，求得n时刻产液量，由含水率fw n(Sw2)，进而确定产水量和产油量；步骤5，根据物质平衡原理，得到n+1时刻平均含水饱和度步骤6，重复(2)-(5)，直到n+1＝N，计算结束。Fig. 2 is the flow chart of the development dynamic calculation method under the production condition of constant liquid volume of multi-layer co-production oil reservoir of the present invention, comprises step 1, known physical and fluid parameters of each small layer reservoir; Step 2, known n time The average water saturation of the small layer is calculated to obtain the water saturation at the outlet, and the phase permeability curve is fitted to the fractional flow equation to obtain the oil-water relative permeability and water content; step 3, the known total liquid production and the relative oil-water ratio at n time Permeability, obtained by iterative trial calculation under the condition of constant liquid volume production, corresponding to the production pressure difference ΔP n at time n ; step 4, according to the generalized Darcy’s law, obtain the liquid production rate at time n, from the water cut f w n (S w2 ), and then determine the water production and oil production; step 5, according to the principle of material balance, the average water saturation at time n+1 is obtained Step 6, repeat (2)-(5) until n+1=N, and the calculation ends.
东辛油田是典型的复杂断块油藏，纵向油层数目多，多层合采应用普遍。选取其中的一个层系为例，作详细说明，具体实施步骤如下：Dongxin Oilfield is a typical complex fault-block oil reservoir with a large number of vertical oil layers, and multi-layer commingled production is widely used. Select one of the layer systems as an example to give a detailed description. The specific implementation steps are as follows:
1.已知各小层储层物性和流体参数1. The physical and fluid parameters of each sublayer reservoir are known
已知各小层储层物性和流体参数，包括含有面积、储层有效厚度、油层宽度、绝对渗透率、孔隙度、地下原油粘度、平均含水饱和度等。根据注水启动压力梯度与绝对渗透率统计规律G＝55.624×K-1.7145，得到注水启动压力梯度，具体见表1。The physical and fluid parameters of each sub-layer reservoir are known, including containing area, effective reservoir thickness, oil layer width, absolute permeability, porosity, underground crude oil viscosity, average water saturation, etc. According to the statistical law of water injection starting pressure gradient and absolute permeability G=55.624×K -1.7145 , the water injection starting pressure gradient is obtained, see Table 1 for details.
表1各小层储层物性和流体参数Table 1 Reservoir physical and fluid parameters of each sublayer
2.已知n时刻计算油水相对渗透率和含水率2. Known n time Calculation of oil-water relative permeability and water cut
多层合采油藏以定产液量20m3/d生产，取时间间隔Δt＝tn+1-tn为30天，以生产时间2年(n＝24)为例，已知各小层平均含水饱和度分别为0.55013、0.61842、0.64254、0.62543、0.57323，由平均含水饱和度和出口端含水饱和度的关系求得出口端含水饱和度为0.48230、0.58473、0.62091、0.59524、0.51694，再由相渗曲线，拟合得到油水相对渗透率与出口端含水饱和度的关系曲线kro＝6.6443Sw2 2-9.1544Sw2+3.1565，krw＝3.0522Sw2 2-2.1082Sw2+0.3651，求得油相相对渗透率为0.2869、0.0754、0.0340、0.0616、0.1998，水相相对渗透率为0.0583、0.1759、0.2328、0.1916、0.0909；不考虑油水重力差和毛管力的影响，根据分流量方程计算出含水率fw 24(Sw2)为0.8120、0.9233、0.9394、0.9272、0.8636。The multi-layer co-production oil reservoir is produced with a fixed fluid production rate of 20m 3 /d, and the time interval Δt=t n+1 -t n is taken as 30 days. Taking the production time of 2 years (n=24) as an example, it is known that each small layer average water saturation are 0.55013, 0.61842, 0.64254, 0.62543, and 0.57323, respectively, from the relationship between the average water saturation and the outlet water saturation Calculate the water saturation at the outlet are 0.48230, 0.58473, 0.62091, 0.59524, 0.51694, and then from the phase permeability curve, the relationship curve k ro =6.6443S w2 2 -9.1544S w2 +3.1565, k rw = 3.0522S w2 2 -2.1082S w2 +0.3651, get the relative permeability of oil phase 0.2869, 0.0754, 0.0340, 0.0616, 0.1998, relative permeability of water phase are 0.0583, 0.1759, 0.2328, 0.1916, 0.0909; regardless of the influence of oil-water gravity difference and capillary force, according to the partial flow equation The calculated moisture content f w 24 (S w2 ) is 0.8120, 0.9233, 0.9394, 0.9272, 0.8636.
3.已知单井产液量和n时刻油水相对渗透率，试算迭代生产压差3. Given the liquid production rate of a single well and the relative oil-water permeability at time n, try to calculate the iterative production pressure difference
根据注采平衡，单井产液量与注入量相等为20m3/d；由步骤(2)可知n时刻油水相对渗透率和根据广义达西定律，考虑注水启动压力梯度的小层产液量为已知单井总定产液量，通过迭代试算，直到满足各小层产液量之和与单井总产液量相等，求得生产压差ΔP24为2.514MPa。According to the injection-production balance, the liquid production rate of a single well is equal to the injection rate of 20m 3 /d; from step (2), the oil-water relative permeability at time n can be known with According to the generalized Darcy's law, the liquid production rate of the small layer considering the water injection start-up pressure gradient is Knowing the total liquid production rate of a single well, through iterative trial calculation, until the sum of the liquid production rate of each small layer is equal to the total liquid production rate of a single well, the production pressure difference ΔP 24 is obtained to be 2.514MPa.
4.已知n时刻生产压差和含水率，求产油量和产水量4. Knowing the production pressure difference and water cut at n time, calculate the oil production and water production
已知n＝24时刻与给定产液量相匹配的生产压差ΔP24，依据广义达西定律，求得各小层的产液量为0.6184、5.7914、1.9296、7.9434、3.7173m3/d，再由步骤(2)中各小层n时刻含水率fw 24(Sw2)，求得日产油量为0.1067、0.4033、0.1066、0.5244、0.4628m3/d；日产水量为0.5117、5.3881、1.8236、7.4190、3.2545m3/d。Knowing the production pressure difference ΔP 24 matching the given fluid production at time n=24, the fluid production of each small layer can be obtained according to the generalized Darcy's law is 0.6184, 5.7914, 1.9296, 7.9434, 3.7173m 3 /d, and then the daily oil production is obtained from the water cut f w 24 (S w2 ) of each small layer at time n in step (2) 0.1067, 0.4033, 0.1066, 0.5244, 0.4628m 3 /d; daily water production 0.5117, 5.3881, 1.8236, 7.4190, 3.2545m 3 /d.
5.根据物质守恒原理，求得n+1时刻平均含水饱和度5. According to the principle of material conservation, the average water saturation at time n+1 is obtained
根据物质平衡原理，n到n+1时刻产油量引起的平均含油饱和度减少量，与平均含水饱和度增加量相等，进入高含水期，油水总渗流阻力变化速率减小，在较小时间间隔内，近似认为产油量保持不变，为一个常数，由体积法求得n+1＝25时刻平均含水饱和度为0.55052、0.61961、0.64325、0.62658、0.57419。According to the principle of material balance, the decrease in average oil saturation caused by oil production at time n to n+1 is equal to the increase in average water saturation. When entering the high water cut period, the rate of change of total oil-water seepage resistance decreases. In the interval, it is approximately considered that the oil production remains constant, which is a constant, and the volumetric method Find the average water saturation at time n+1=25 are 0.55052, 0.61961, 0.64325, 0.62658, 0.57419.
6.重复(2)-(5)，直到n+1＝N，计算结束。若计算时间为10年，时间间隔为30天，则N为120，计算结束时刻开发动态，得到生产压差ΔP120为2.055MPa，日产油量为为0.0433、0.1355、0.0404、0.1673、0.1648m3/d，日产水量为0.4800、5.7459、1.7010、7.4760、4.0458m3/d。6. Repeat (2)-(5) until n+1=N, and the calculation ends. If the calculation time is 10 years, the time interval is 30 days, then N is 120, and the development dynamics at the end of the calculation, the production pressure difference ΔP 120 is 2.055MPa, and the daily oil production is 0.0433, 0.1355, 0.0404, 0.1673, 0.1648m 3 /d, daily water production 0.4800, 5.7459, 1.7010, 7.4760, 4.0458m 3 /d.
从以上计算实例可以看出，纵向多层合采油藏，定液量生产条件下，可以通过试算得到不同时刻对应的生产压差，依据广义达西定律，求得产液量，再由含水率，进一步计算出产油量和产水量。随着时间的增大，含水率不断上升，油水总渗流阻力减小，与定产液量对应的生产压差不断减小，产油量越来越小。本发明提供了一种可以计算多层合采油藏油井产水量和产油量的方法，可对现场实际生产开发提供指导，具有一定的推广价值。From the above calculation examples, it can be seen that under the condition of constant liquid volume production in vertical multi-layer co-production reservoirs, the production pressure difference corresponding to different moments can be obtained through trial calculation, and the liquid production volume can be obtained according to the generalized Darcy’s law, and then obtained by The water content is used to further calculate the oil production and water production. With the increase of time, the water cut continues to rise, the total seepage resistance of oil and water decreases, the production pressure difference corresponding to the constant liquid production decreases, and the oil production becomes smaller and smaller. The invention provides a method capable of calculating the water production rate and oil production rate of an oil well in a multi-layer co-production oil reservoir, can provide guidance for actual production and development on site, and has certain popularization value.
以上的仅是本发明的优选实施方式，应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。The above are only preferred embodiments of the present invention, and it should be pointed out that for those skilled in the art, without departing from the creative concept of the present invention, some modifications and improvements can also be made, and these all belong to the scope of the present invention. protected range.
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