生产测井多相流动解释中关键参数的确定

Determining Key Parameters for Production Logging Interpretation of Multiphase Flow

文章剖析了在多相油气生产井中涡轮流量计、含水率计和密度计的响应机理,认为生产测井结果受流型和流量变化的影响很大。因此,在利用生产测井资料确定井的分层动态剖面时,首先要判断解释层的流型,再根据具体的刻度方法确定平均流体速度和各相持率。文中以气水均匀分布为例,导出了计算油、气、水各相流量的表达式。利用该式并结合流量及持率资料,可方便地计算出各产层的流体产量。由于流型的变化主要取决于轻质相持率和平均密度的变化,因此可用密度和持率资料判断各解释层的流型。该判断方法因直接应用了生产测井资料,从而可在未知各相流量的情况下,判断解释层的流型,为生产测井资料的综合解释提供必要的信息。

Based on the principal investigation of spinner flowmeter, water cut tool and densimeter, it is pointed out that production logging data is strongly dependent upon the changes of flow pattern and flowrate in muttiphase flow. Consequently, the flow pattern of an interval interpreted is first identitied when production logging data is used for determining the production profiles, hence the holdup and fluid velocity of each phase with specific calibration are then calculated. Several expressions, which can be easily used in the calculations of oil, gas and water flowrates as well as their production rates from each perforated interval in combination with holdup and flowrate data, are given in this paper. Because the transition of flow pattern is primarily subjected to the change of light phase holdup and average density, the values of density and holdup can be used for classifying the flow pattern of each interval. Thus, this method, which is related to production logging data, can be used for estimating the flow pattern under the condition of unknown flowrate of each phase in order to provide the key parameters for comprehensive interpretation of production logging.