Evaluation of Formation Mechanical Properties Along Horizontal Well Based on Drilling Cuttings:A Case Study of Taiyuan Formation Limestone in Ordos Basin
The tight limestone gas reservoir of Taiyuan Formation in Ordos Basin has high reservoir development potential large scale development and production depend on segmented volume fracturing technology.Horizontal well coring is difficult and costly,and it is difficult to obtain the mechanical properties of the whole well section,which supports the fine optimization of horizontal well fracturing scheme.The drilling cuttings of the whole well can be easily obtained.Therefore,an innovative method for evaluating horizontal well formation mechanical properties based on drilling cuttings is proposed in this paper.Through uniaxial/triaxial compression test and nanoindentation test of underground core,the microscopic component model of limestone is defined,and the rela-tionship between single component response and macroscopic overall response is studied.The grid nanoindenta-tion test is carried out for drilling cuttings and downhole core at the same depth in the same well,the relationship between drilling cuttings and mechanical properties of downhole core is calibrated,and a continuous section of horizontal well formation mechanical properties is established based on drilling cuttings.The application examples show that the nano-indentation test based on drilling cuttings is conducive to the fine characterization of horizontal well formation lithology and the continuous inversion of static elastic modulus distribution of horizontal well for-mation,and provides basic data for the identification of fracturing sweet spots,fracturing cluster and perforation optimization of horizontal well formation.The research results prove that it is feasible to characterize rock me-chanical properties based on drilling cuttings,and provide a new idea for the establishment of reservoir mechani-cal properties profile in the whole section of horizontal well,which is conducive to the fine optimization of hy-draulic fracturing in horizontal Wells.
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