油田开发动态色谱指纹监测技术的数学模拟研究

Mathematical modeling of dynamic chromatography fingerprint monitoring in the oilfield development.

由于储集层和油藏流体非均质性分布的影响 ,混层开采的生产井中各单层的产液贡献不同 ,油田开发动态色谱指纹监测就是利用 2 0世纪 90年代发展起来的色谱指纹相关分析技术 ,通过井口油藏流体色谱指纹化合物组成的变化来度量产液量的变化 ,监测油藏流体的运动规律和不同单层的产液贡献 ,对油藏实施分层管理 ,为油田调整挖潜、制定治理措施和提高采收率提供重要依据。给出根据油藏开发的实际生产过程建立的物理模型和基于QR算法的数学模型。结合配比实验技术建立色谱指纹参数数据库并进行化学模拟和数学模拟 ,结果表明油田开发动态监测模拟计算的色谱指纹参数的约束条件是 :①表征各单油层非均质性的色谱指纹参数是一个不随其贡献量 (体积或质量 )变化的量 ;②对同一指纹化合物 ,混合样中该化合物的量取决于各单层中该化合物的相对贡献率 ;③表示各单层的特征指纹化合物的数组之间要有一定的离散度 ,以避免产生非奇异系数矩阵和共线性问题出现。因此 ,选择新的色谱指纹化合物参数 ,成功地进行了 3层混采动态色谱指纹监测的化学模拟与数学模拟。图 2表 1参

The contribution of individual layers to liquid production is different from each other in the production due to heterogeneities of reservoir rocks and the fluid distribution. Dynamically geochemical monitoring in oilfield development is to estimate the variation of bulk liquid production according to the composition of chromatography fingerprint in the reservoir using chromatography fingerprint correlation analysis developed in 1990's. The aim is to monitor the behavior of fluid in the reservoir, to carry out reservoir management, and make measure to raise oil recovery factor. Physical and mathematical models based on the QR calculation have been made according to the process of commingled production of different pay zones. Chromatography fingerprint parameter database can be established using allocation experimental technology to carry out the research of chemical and mathematical modeling and to determine the characteristic methods of those and the four constrained conditions of model parameters. Modeling results show that the constrained conditions of chromatography fingerprint parameters in calculation are:(1) the parameter reflecting the heterogeneity of each single pay zone remains constant with the variation of contribution; (2) for one fingerprint compound, the content of this compound in the commingled samples are under the control of the relative contribution of single pay zone respectively ; (3)a certain discrete degree must be exist between the array of the parameters of each zone. Therefore mathematical modeling on dynamic monitoring of three pay zone commingled production has been resolved by choosing new parameter. The comprehensive research has been developed on the theory model of dynamically geochemical monitoring technology and dynamic analysis of oilfield exploitation. This is significant in theory and practice.