钻遇大型溶洞的油井参数及储层参数动态评价方法

doi:10.11743/ogg20200320

Abstract

Abstract: The carbonate oil reservoirs of fractures and cavities are diverse in types with large-scale karst caverns,dissolved pores,and internal fractures of various scales.The reservoirs are characterized by extreme irregularity in morphology,large differences in scale,poor connectivity,resulting in extremely strong heterogeneity.Among others,large-scale karst caverns are the main reservoir type;fractures are the major seepage channels;and the contacts between oil and water layers are complicated.Currently,the static sculpturing of fractured-vuggy unit based on seismic interpretation usually results in large inconsistency in assessment of oil in place,and cannot be applied to evaluate other oil and reservoir parameters.To improve the accuracy in assessment,we propose a new method for the assessment of oil in place and other reservoir parameters by dynamic data based on actual production data and dynamic production analysis.In the new method,large-scale karst cavern reservoirs is simplified as a composite model of multi-porosity media with an integration of large-scale karst caverns and surrounding small-scale pores,cavities and cracks.The fluid flow in large-scale karst caverns is regarded as free flow,while that in the surrounding multi-porosity media is equivalent to Darcy flow,and then the corres-ponding mathematical model is built in coupling Darcy flow with free flow.Afterwards,the dynamic production curves and the parameter sensitivity analysis are obtained by solving the mathematical equation.Finally,the cross-plot of normalized Blasingame typical curves is built,and the fitting of the plot with actual production data solves well and reservoir parameters.The field application to the Tarim oilfield verifies the reliability and practicability of the newly-proposed method.And the parameters acquired can be applied to the assessment of dynamic oil production and to guide more reasonable infill well emplacement and recovery enhancement.

Key words: multi-porosity medium, Darcy flow-free flow coupling, composite model, dynamic production analysis, dynamic reserve, fractured-vuggy reservoir, Tarim oilfield

CLC Number:

TE344

Yu Qingyan, Hu Xiangyang, Li Yong, Jia Ying. Dynamic evaluation of well and reservoir parameters on large-scale karst caverns encountered in drilling[J]. Oil & Gas Geology, 2020, 41(3): 647-654.

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Dynamic evaluation of well and reservoir parameters on large-scale karst caverns encountered in drilling

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