基于磨屑收集的套管磨损监测技术

我国西部和海上油气田钻井过程中的套管磨损问题十分突出，套管磨损监测是协助解决套管防磨的关键技术。目前基于磨屑收集的套管磨损监测方法由于缺乏系统的理论指导，监测指标单一和监测方法不统一等原因，不能满足套管磨损现场监测工作的需要。通过理论分析，建立了循环钻井液中磁性磨屑生成与浓度分布模型和磨屑收集的套管磨损监测的总体工作流程，根据磨屑浓度分布规律来确定最佳的监测位置和合理的监测参数。所确立的套管磨损量定量计算方法，结合了磨屑收集与钻杆检测方法，能更准确地计算井下套管线性磨损量。

RESEARCH ON MONITORING TECHNOLOGY FOR CASING WEAR BY COLLECTING DEBRIS

In the western and offshore oilfields of China, casing wear in the deep or ultra deep well drilling occurs frequently, which can lead to great drilling costs. Wear monitoring is very important for solving this problem. However, For lack of systematic theory research, the existent casing monitoring method basing on debris collection can only provide single gross weight, which can not meet the demand of field monitoring. For solving these problems, according to theoretical analysis the producing and distributing models of magnetic debris in drilling fluid has been presented, the best monitoring position and parameters has been decided based on the models. Then monitoring procedures and calculating model for casing wear amount based on debris collection has been presented as well. If combining with the diameter detection of drilling pipe, debris collection monitoring can get more precise results of casing wear amount. The main procedures of the methods are presented in the paper. Thus by studying on debris collection monitor technology deeply, a systematic theory and method has been proposed as guidance for the monitoring operation.