施工机械地模型及井壁稳定性分析方法对二氧化碳注入井.pdf

SPE 126624 Construction of a Mechanical Earth Model and Wellbore Stability Analysis for a CO2 Injection Well D. Lee, V. Singh, and T. Berard, Schlumberger Copyright 2009, Society of Petroleum Engineers This paper was prepared for presentation at the 2009 SPE International Conference on CO2 Capture, Storage, and Utilization held in San Diego, California, USA, 2–4 November 2009. This paper was selected for presentation by an SPE program committee following review of information contained in an abstract submitted by the author(s). Contents of the paper have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author(s). The material does not necessarily reflect any position of the Society of Petroleum Engineers, its officers, or members. Electronic reproduction, distribution, or storage of any part of this paper without the written consent of the Society of Petroleum Engineers is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of SPE copyright. Abstract A mechanical earth model (MEM) and wellbore stability analysis were completed for a CO2 injection well in the Eau Claire shale where in offset wells, severe borehole enlargements were experienced. This shale serves as a caprock for the Mt. Simon injection zone in the planned CO2 injection well and therefore, borehole enlargement had to be minimized to provide zonal isolation and containment for injection. After drilling the CO injection well, a 2 comparison was made between the predrill prediction and actual results. Borehole enlargement was experienced at depths predicted by the predrill model, but borehole enlargement severity was minimized with improved drilling practices. To determine the formatio