CN115586208A - Device and method for measuring oil-water two-phase flow phase content by annular temperature sensor array - Google Patents
Device and method for measuring oil-water two-phase flow phase content by annular temperature sensor arrayDownload PDFInfo
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Abstract
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Translated fromChinese技术领域technical field
本发明涉及油水两相流相含率测量领域，具体地涉及环形温度传感器阵列测量油水两相流相含率的装置和方法。The invention relates to the field of phase holdup measurement of oil-water two-phase flow, in particular to a device and method for measuring the phase holdup of oil-water two-phase flow by an annular temperature sensor array.
背景技术Background technique
对于油水两相流相含率的测量，最原始的方法是定时取样蒸馏化验的人工方法，这种检测方法取样时间长，取样随机性大，无法进行在线测量，无法满足油田生产自动化管理的要求。随着测量技术的更新，目前应用最多的油水两相流相含率测量方法主要有密度法、射线法、电导法、电容法以及光学非接触测量法。这些方法主要是利用油水两相的介质常数不同、对射线的衰减不同、对微波的吸收能力不同以及对光的折射率不同等特性进行流场分布测量。其中电导传感器因其工作原理简单、制作工艺方便、造价低且测量相应速度快等优点，被应用的更为广泛。For the measurement of oil-water two-phase flow phase holdup, the most primitive method is the manual method of regular sampling, distillation and testing. This detection method takes a long time to sample, and the randomness of sampling is large. Online measurement cannot be carried out, and it cannot meet the requirements of automatic management of oilfield production. . With the update of measurement technology, the most widely used methods for measuring holdup of oil-water two-phase flow mainly include density method, ray method, conductometric method, capacitance method and optical non-contact measurement method. These methods mainly use the characteristics of the oil-water two phases, such as different dielectric constants, different attenuation of rays, different absorption capabilities for microwaves, and different refractive indices for light, to measure the flow field distribution. Among them, the conductivity sensor is more widely used because of its simple working principle, convenient manufacturing process, low cost and fast measurement response speed.
现有的油水两相流检测技术中，密度法以油水两相密度作为测量特征量，原理简单，但是原油(尤其是稠油)与水的密度相差较小，同时石油开采过程中存在大量的伴生气，不可避免地会给测量结果带来较大误差。射线法测量精度高，但价格昂贵，内含放射源，对安全防护有较高的要求，这也限制了此类产品的大量使用。微波法对电子线路和环境干扰等条件要求高，然而实际工作中对于微波和流体介质特性之间的关系尚有待进一步明确。电容法以两相电容值作为测量特征量，原理简单，成本低，但电极易受原油的腐蚀、结垢、结蜡等因素影响，致使长期工作运行的稳定可靠性差，同时水的介电常数受矿化度影响非常大，在高含水情况下会极大地影响测量精度。类似于电容法，电导法受地下水矿化度影响也很大，单独使用电导法测量效果不是很好，且电导传感器用于测量局部含水率和流速的探针需要浸入流体内，探针易受原油的腐蚀、结垢、结蜡等因素影响，致使长期工作运行的稳定可靠性差。非接触式光学设备使用非接触在线激光全场测量技术对油管内流场进行测量，可以对管内流场变化进行较为细致的观测，但是目前所应用的设备均为二维测量设备，对于解析三维流动特性存在具有一定的片面性和局限性，且大部分光学测量设备对被测液体有严格要求，如设备要求所测液体严格透明，以便激光能穿透所测液体，点亮示踪粒子，否则将影响测量准确性，因此该方法无法对不透明原油在流动过程中进行流场观测。In the existing oil-water two-phase flow detection technology, the density method uses the oil-water two-phase density as the measurement characteristic quantity. The principle is simple, but the density difference between crude oil (especially heavy oil) and water is small, and there are a large number of Associated gas will inevitably bring large errors to the measurement results. The ray method has high measurement accuracy, but it is expensive, contains radioactive sources, and has high requirements for safety protection, which also limits the mass use of such products. The microwave method has high requirements on conditions such as electronic circuits and environmental interference. However, the relationship between microwave and fluid medium characteristics in actual work needs to be further clarified. The capacitance method uses the two-phase capacitance value as the measurement feature quantity. The principle is simple and the cost is low. However, the electrode is easily affected by factors such as crude oil corrosion, scaling, and waxing, resulting in poor stability and reliability of long-term operation. At the same time, the dielectric properties of water The constant is greatly affected by salinity, and will greatly affect the measurement accuracy in the case of high water content. Similar to the capacitance method, the conductivity method is also greatly affected by the salinity of groundwater. The measurement effect of the conductivity method alone is not very good, and the probe of the conductivity sensor used to measure the local water content and flow velocity needs to be immersed in the fluid, and the probe is vulnerable to Crude oil corrosion, scaling, waxing and other factors lead to poor stability and reliability of long-term operation. Non-contact optical equipment uses non-contact online laser full-field measurement technology to measure the flow field in the oil pipe, and can observe the change of the flow field in the pipe in a more detailed manner. However, the equipment currently used is two-dimensional measurement equipment. The flow characteristics have certain one-sidedness and limitations, and most optical measurement equipment have strict requirements on the measured liquid. For example, the equipment requires the measured liquid to be strictly transparent so that the laser can penetrate the measured liquid and light up the tracer particles, otherwise It will affect the measurement accuracy, so this method cannot observe the flow field of opaque crude oil in the flow process.
发明内容Contents of the invention
针对现有测量技术误差大、测量源放射性强、探头易受浸入流体腐蚀、结垢从而影响测量精度以及非接触式光学测量设备无法对不透明原油进行测量等问题，本发明的目的是提供一种环形温度传感器阵列测量油水两相流相含率的装置和方法，基于非接触式边界层法流量和相含率测量原理，将现有的单个温度传感器扩展为环形分布的传感器阵列，环形阵列在管外均匀分布。结合流体各相的密度和比热容差异，不同相含率的混合流体经过加热后温度升高程度不同，因此，可利用环形传感器阵列对下游流体温度进行精确测量，并完成相含率的计算。在此基础上，设计了温度自适应反馈调节单元对温差信号进行实时监测，可及时调节加热带温度，在一定程度上克服现有浸入式两相流量测量技术的缺陷，并解决测量精度不高、存在放射性等问题，且在一定程度上节省能源。Aiming at the problems of large errors in existing measurement techniques, strong radioactivity of measurement sources, probes susceptible to immersion fluid corrosion and fouling that affect measurement accuracy, and non-contact optical measurement equipment unable to measure opaque crude oil, the purpose of the present invention is to provide a The device and method for measuring the phase holdup of oil-water two-phase flow by an annular temperature sensor array, based on the non-contact boundary layer method flow and phase holdup measurement principle, expands the existing single temperature sensor into an annular distributed sensor array, and the annular array is in Evenly distributed outside the tube. Combined with the difference in density and specific heat capacity of each phase of the fluid, the temperature rise of the mixed fluid with different phase holdups is different after heating. Therefore, the annular sensor array can be used to accurately measure the temperature of the downstream fluid and complete the calculation of the phase holdup. On this basis, a temperature adaptive feedback adjustment unit is designed to monitor the temperature difference signal in real time, which can adjust the temperature of the heating zone in time, overcome the defects of the existing immersion two-phase flow measurement technology to a certain extent, and solve the problem of low measurement accuracy , There are problems such as radioactivity, and it saves energy to a certain extent.
为实现上述目的，本发明采取以下技术方案：To achieve the above object, the present invention takes the following technical solutions:
一种环形温度传感器阵列测量油水两相流相含率的装置，包括：A device for measuring the phase holdup of oil-water two-phase flow with an annular temperature sensor array, comprising:
加热带，加热带设置在管道外，用于加热管道内的油水混合物，使管道内的油水混合物的温度上升；The heating belt, the heating belt is arranged outside the pipeline, and is used to heat the oil-water mixture in the pipeline to increase the temperature of the oil-water mixture in the pipeline;
温度传感器，温度传感器设置在管道的上游侧，温度传感器位于加热带的左侧，用于检测流入管道的流体的初始温度；A temperature sensor, the temperature sensor is arranged on the upstream side of the pipeline, the temperature sensor is located on the left side of the heating belt, and is used to detect the initial temperature of the fluid flowing into the pipeline;
环形温度传感器阵列，环形温度传感器阵列设置在管道的下游侧，位于加热带的右侧，用于检测温差信号；和An annular temperature sensor array, the annular temperature sensor array is arranged on the downstream side of the pipeline and on the right side of the heating belt for detecting temperature difference signals; and
边界层式流量计，边界层式流量计利用温差信号来测量管道内的油水混合物的流量。Boundary layer flowmeter, the boundary layer flowmeter uses the temperature difference signal to measure the flow of the oil-water mixture in the pipeline.
加热电路，加热电路对加热带进行加热；和a heating circuit that heats the heating strip; and
温差测量电路，温差测量电对温差进行测量以产生温差信号。The temperature difference measurement circuit measures the temperature difference to generate a temperature difference signal.
温度自适应反馈单元，温度自适应反馈单元对温差信号进行实时监测，以便不断调节加热带的温度，当温差信号数值过大时，加热带温度降低；当温差信号数值趋近于0时，判断有无流体流过，如果无流体流入则加热带温度降低，如果有流体流入则加热带温度升高，如果温差信号数值在测定范围内则输出该温差信号。The temperature adaptive feedback unit, the temperature adaptive feedback unit monitors the temperature difference signal in real time, so as to continuously adjust the temperature of the heating belt. When the value of the temperature difference signal is too large, the temperature of the heating belt decreases; Whether there is fluid flowing, if there is no fluid flowing in, the temperature of the heating zone will decrease, if there is fluid flowing in, the temperature of the heating zone will increase, and if the value of the temperature difference signal is within the measurement range, the temperature difference signal will be output.
环形温度传感器阵列沿被测管道外壁均匀分布，各环形温度传感器之间存在相等的角度差，当被加热带加热的流体流经环形温度传感器阵列所处的管道位置时，环形温度传感器阵列测取的温度信息会发生变化。The annular temperature sensor array is evenly distributed along the outer wall of the pipeline to be tested, and there is an equal angle difference between the annular temperature sensors. When the fluid heated by the heating belt flows through the position of the pipeline where the annular temperature sensor array is located, the annular temperature sensor array measures The temperature information will change.
一种使用环形温度传感器阵列测量油水两相流相含率的方法，使用上述环形温度传感器阵列测量油水两相流相含率的装置，根据不同方向温度传感器测取的温升信号，分析流体在各个方向的流速和流量，利用环形温度传感器阵列测得的温度信号，对上、下游的温差进行校正。A method for measuring the phase holdup of oil-water two-phase flow by using an annular temperature sensor array, using the above-mentioned device for measuring the phase holdup of oil-water two-phase flow by using the annular temperature sensor array, and analyzing the flow of the fluid according to the temperature rise signals measured by temperature sensors in different directions. The flow velocity and flow in all directions are corrected for the temperature difference between the upstream and downstream using the temperature signal measured by the annular temperature sensor array.
通过温度自适应反馈调节单元对温差信号进行实时监测，以便不断调节加热带温度，从而减小温度测量误差。The temperature difference signal is monitored in real time through the temperature self-adaptive feedback adjustment unit, so as to continuously adjust the temperature of the heating belt, thereby reducing the temperature measurement error.
本发明由于采取以上技术方案，其具有以下优点：The present invention has the following advantages due to the adoption of the above technical scheme:
根据不同方向温度传感器测取的温升信号，可分析流体在各个方向的流速和流量；进一步，利用环形温度传感器阵列测得的温度信号，对上下游的温差ΔT进行校正，可克服非接触式相含率测量技术中由于上下游温差变化不明显从而导致测量误差大、测量精度低的问题。According to the temperature rise signals measured by temperature sensors in different directions, the flow velocity and flow rate of the fluid in various directions can be analyzed; further, the temperature difference ΔT between the upstream and downstream is corrected by using the temperature signals measured by the annular temperature sensor array, which can overcome the non-contact In the phase holdup measurement technology, the temperature difference between upstream and downstream does not change significantly, which leads to large measurement errors and low measurement accuracy.
附图说明Description of drawings
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本发明的限制。在整个附图中，用相同的附图标记表示相同的部件。在附图中：Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Throughout the drawings, the same reference numerals are used to refer to the same parts. In the attached picture:
图1是基于环形温度传感阵列的油水两相相含率测量原理的示意图；Fig. 1 is a schematic diagram of the oil-water two-phase phase holdup measurement principle based on the annular temperature sensing array;
图2是单个传感器在管道截面分布示意图；Figure 2 is a schematic diagram of the distribution of a single sensor in a pipeline section;
图3是环形传感器阵列在管道截面分布示意图；和Fig. 3 is a schematic diagram of the distribution of the annular sensor array in the pipeline section; and
图4是温度自适应反馈调节单元示意图。Fig. 4 is a schematic diagram of a temperature self-adaptive feedback regulation unit.
附图中各标记表示如下：Each sign in the attached drawing represents as follows:
1、温度传感器；2、管道；3、加热带；4、环形温度传感器阵列；5、加热电路；6、温度自适应反馈调节单元；7、温差测量电路；A、流体流入方向。1. Temperature sensor; 2. Pipeline; 3. Heating belt; 4. Annular temperature sensor array; 5. Heating circuit; 6. Temperature adaptive feedback adjustment unit; 7. Temperature difference measurement circuit; A. Fluid inflow direction.
具体实施方式detailed description
下面将参照附图更详细地描述本发明的示例性实施方式。虽然附图中显示了本发明的示例性实施方式，然而应当理解，可以以各种形式实现本发明而不应被这里阐述的实施方式所限制。相反，提供这些实施方式是为了能够更透彻地理解本发明，并且能够将本发明的范围完整的传达给本领域的技术人员。Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
术语解释Terminology Explanation
边界层式流量计：利用流体流动对流换热改变管壁上的温度分布，利用热传导分布效应测来测量流量。Boundary layer flowmeter: Use fluid flow convection heat transfer to change the temperature distribution on the pipe wall, and use heat conduction distribution effect measurement to measure flow.
环形阵列传感器：传感器阵列呈环形排列，可以为一环或者多环，环的形状可以是圆形或者椭圆形或者其他形状的封闭环形，本发明中采用圆形。Ring array sensor: the sensor array is arranged in a ring, which can be one ring or multiple rings, and the shape of the ring can be a circle or an ellipse or a closed ring of other shapes, and the circle is used in the present invention.
根据本申请的一些实施例，提供一种环形温度传感器阵列测量油水两相流相含率的装置，采用环形分布的温度传感器阵列测取油水两相流管外温度，通过分析管外温度场分布，实现油水两相流量和相含率测定。According to some embodiments of the present application, a device for measuring the phase holdup of oil-water two-phase flow with an annular temperature sensor array is provided. The temperature sensor array in annular distribution is used to measure the temperature outside the pipe of oil-water two-phase flow, and the temperature field distribution outside the pipe is analyzed. , to realize the determination of oil-water two-phase flow rate and phase holdup.
测量装置结构如图1所示，在图1中，流体沿着A方向流入管道2中。The structure of the measuring device is shown in FIG. 1 . In FIG. 1 , the fluid flows into the
基于非接触式边界层法流量测量原理，在管道2外安装一段长度的加热带3，加热管内油水混合物，使管道2内油水混合物的温度上升；Based on the flow measurement principle of the non-contact boundary layer method, a length of
在加热带3的左侧，即被测管道2上游处，放置一个温度传感器1，用于检测流入管道的流体初始温度(即环境温度)，在加热带3右侧，即被测管道下游处，安装环形阵列传感器4，检测温升信号ΔT。On the left side of the
温度自适应反馈调节单元6通过监测温差信号ΔT的大小，对加热带温度进行自适应调节，以此减小上、下游的微温差ΔT误差对含油率的测量误差，最终计算油水两相相含率。The temperature self-adaptive feedback adjustment unit 6 monitors the magnitude of the temperature difference signal ΔT, and self-adjusts the temperature of the heating zone, so as to reduce the measurement error of the micro-temperature difference ΔT error between the upstream and downstream to the oil content, and finally calculate the oil-water two-phase phase content Rate.
如图2所示，传统边界层质量流量计下游只放置单个温度传感器，来测量流体温升。当管内流量较小时，温升信号变化微弱，单个温度传感器测量误差将大大增加。As shown in Figure 2, only a single temperature sensor is placed downstream of the traditional boundary layer mass flow meter to measure the temperature rise of the fluid. When the flow in the tube is small, the temperature rise signal changes weakly, and the measurement error of a single temperature sensor will increase greatly.
根据本申请的一些实施例，采用环形温度传感器阵列4代替单个温度传感器，并对阵列传感器接收到的温度信息进行相互校正和补偿，能够提高油水两相流相含率的测量精度。According to some embodiments of the present application, the annular
环形温度传感器阵列4在管外的排布示意如图3所示。The arrangement of the annular
由于加热带上、下游温差变化细微，因此，加热带上、下游温差ΔT的测量精度会直接影响含油率的测量精度。Since the temperature difference between the upper and lower reaches of the heating zone varies slightly, the measurement accuracy of the temperature difference ΔT between the upper and lower reaches of the heating zone will directly affect the measurement accuracy of the oil content.
将下游的单个温度传感器扩展为沿被测管道外壁均匀分布的环形温度传感器阵列4。假设环形温度传感器阵列的数量为N，各传感器之间存在一定的角度差，当被加热带加热的流体流经环形温度传感器阵列所处的管道位置时，环形温度传感器阵列测取的温度信息会发生变化。The downstream single temperature sensor is expanded into an annular
根据不同方向温度传感器测取的温升信号，可分析流体在各个方向的流速和流量；进一步，利用环形温度传感器阵列测得的温度信号，对上、下游的温差ΔT进行校正，可克服非接触式相含率测量技术中由于上、下游温差变化不明显从而导致测量误差大、测量精度低的问题。According to the temperature rise signals measured by temperature sensors in different directions, the flow velocity and flow rate of the fluid in various directions can be analyzed; further, the temperature difference ΔT between the upstream and downstream can be corrected by using the temperature signals measured by the annular temperature sensor array, which can overcome the non-contact In the phase holdup measurement technology, the temperature difference between the upstream and downstream does not change significantly, which leads to large measurement errors and low measurement accuracy.
根据流体力学知识，流体的流动与热量的传递之间有密切的关系：According to the knowledge of fluid mechanics, there is a close relationship between the flow of fluid and the transfer of heat:
Q＝W/(CpρΔT) (1)Q=W/(Cp ρΔT) (1)
式中，In the formula,
Q为流体质量流量；Q is the fluid mass flow rate;
W为加热功率；W is the heating power;
Cp为流体比热容；Cp is the fluid specific heat capacity;
ρ为流体密度；ρ is fluid density;
ΔT为上、下游温升。ΔT is the temperature rise of the upstream and downstream.
假设被测管道上游和下游温度传感器所测流体温度分别为TE和TH，其中，上游温度即为所测流体初始温度(环境温度)，则上下游温度传感器所测温差Assuming that the temperature of the fluid measured by the upstream and downstream temperature sensors of the pipeline under test isTE andTH respectively, where the upstream temperature is the initial temperature of the measured fluid (environmental temperature), the temperature difference measured by the upstream and downstream temperature sensors
ΔT＝TH–TE (2)ΔT＝TH –TE (2)
在式(2)中的微温差ΔT的测量是基于图2所示的传统单一上、下游温度传感器进行的。The measurement of the micro-temperature difference ΔT in formula (2) is based on the traditional single upstream and downstream temperature sensors shown in Fig. 2 .
由传热原理可知，流体在管内加热后，其温度分布沿轴向对称分布，因此，根据图3环形温度传感器阵列测试信号，可将式(2)进一步改为It can be seen from the heat transfer principle that after the fluid is heated in the tube, its temperature distribution is symmetrical along the axial direction. Therefore, according to the test signal of the annular temperature sensor array in Figure 3, the formula (2) can be further changed to
式中，In the formula,
TH1、TH2、…、THN分别为被测管道下游环形阵列传感器测得的温度。TH1 , TH2 , .
由(1)式可知，当加热带的功率W与质量流量Q恒定时，流体的Cpρ与温差ΔT成反比，而油水两相流体的Cpρ由相含率决定，因此，假定油水两相中油相含率为β，则水相含率为1-β，进一步It can be seen from formula (1) that when the power W of the heating zone and the mass flow rate Q are constant, the Cp ρ of the fluid is inversely proportional to the temperature difference ΔT, and the Cp ρ of the oil-water two-phase fluid is determined by the phase holdup. Therefore, assuming that the oil-water The holdup of the oil phase in the two phases is β, and the holdup of the water phase is 1-β, further
式中，In the formula,
β为油相含率；β is the oil phase hold-up;
q为流体的体积流量；q is the volumetric flow rate of the fluid;
Cp,w和Cp,o分别为水相和油相的比热容；Cp,w and Cp,o are the specific heat capacities of water phase and oil phase, respectively;
ρw和ρo分别表示水相和油相的密度；ρw andρo represent the densities of the water phase and the oil phase, respectively;
下标o为油相表示符，w为水相表示符。The subscript o is the oil phase indicator, and w is the water phase indicator.
由于油水两相的定压比热容以及密度在温升变化范围内近似为常数，因此，当加热器功率W和油水混合物的质量流量Q已知时，通过测量温差信号ΔT，即可计算油相含率β。Since the specific heat capacity and density of the oil-water two-phase are approximately constant within the range of temperature rise, when the heater power W and the mass flow rate Q of the oil-water mixture are known, the oil phase content can be calculated by measuring the temperature difference signal ΔT Rate β.
温差信号ΔT对被测流体相含率有直接影响，采用环形温度传感器阵列可在一定程度上减小温度测量误差，然而，被测管道内流体流速这一未知量对温差信号ΔT也会产生一定的影响。The temperature difference signal ΔT has a direct impact on the phase holdup of the measured fluid, and the temperature measurement error can be reduced to a certain extent by using an annular temperature sensor array. Impact.
当管道内流体流速过快或者没有流体流入时，换热不充分，上下游温差ΔT将趋近于0，不利于相含率测量；When the fluid velocity in the pipeline is too fast or there is no fluid inflow, the heat exchange is insufficient, and the temperature difference ΔT between upstream and downstream will approach 0, which is not conducive to the measurement of phase holdup;
当管道内流体流速较慢时，换热充分，此时可以适当降低加热带温度，实现低功耗。When the flow rate of the fluid in the pipeline is slow, the heat exchange is sufficient. At this time, the temperature of the heating zone can be appropriately reduced to achieve low power consumption.
因此，增加温度自适应反馈调节单元，对温差信号ΔT进行实时监测以此不断调节加热带温度，不仅可减小温度测量误差，还可适当节能。温度自适应反馈调节单元原理如图4所示。Therefore, adding a temperature adaptive feedback adjustment unit to monitor the temperature difference signal ΔT in real time to continuously adjust the temperature of the heating zone can not only reduce the temperature measurement error, but also save energy appropriately. The principle of the temperature adaptive feedback adjustment unit is shown in Figure 4.
如图4所示，加热电路5对加热带进行加热，温差测量电路7对温差进行测量，设置温度自适应反馈单元6，对温差信号ΔT进行实时监测以此不断调节加热带温度，当ΔT数值过大时，加热带温度降低；当ΔT数值趋紧于0时，判断有无流体流过，如果无流体流入则加热带温度降低，如果有流体流入则加热带温度升高；如果ΔT数值在测定范围内则输出温差ΔT。As shown in Figure 4, the
本发明创新点是基于非接触式边界层式流量测量原理，将传统的在被测管道下游分布的单个温度传感器扩展为环形温度传感器阵列，并增加温度自适应反馈调节单元对温差信号ΔT进行实时监测，从而及时调节加热带温度；根据测取的油水两相流体的热学特性，实现井下油水两相相含率精确计算。The innovation of this invention is based on the principle of non-contact boundary layer flow measurement, expanding the traditional single temperature sensor distributed downstream of the measured pipeline into an annular temperature sensor array, and adding a temperature adaptive feedback adjustment unit to perform real-time temperature difference signal ΔT Monitoring, so as to adjust the temperature of the heating zone in time; according to the measured thermal characteristics of the oil-water two-phase fluid, the accurate calculation of the downhole oil-water two-phase phase holdup is realized.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
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