水平井井眼清洁随钻监测与评价方法研究

Application of horizontal wellbore cleanness monitoring and evaluation technology while drilling

摘要:

现有的岩屑流量测量系统在实际工作过程中存在岩屑倾倒不彻底，以及井眼清洁和井壁稳定方面的风险。本文在分析影响水平井井眼清洁因素的基础上，针对现有岩屑流量测量存在的问题，提出了基于岩屑推扫的岩屑流量测量技术方案，解决了以往岩屑流量测量过程设备倾倒岩屑不彻底问题，减少人工清洁频率；基于岩屑返出率建立了井眼清洁和井壁稳定定量监测方法，形成了井眼清洁和井壁稳定风险监测与评价方法。通过现场应用测试，成功预警了井眼不清洁和井壁失稳风险，证明了本文建立的方法可以应用于现场施工中。

Abstract:

In view of the problems with the existing cuttings flow measurement system， such as incomplete cuttings dumping in the actual working process， the risk of borehole cleanness， wellbore stability， for which the specific evaluation method has not been formed， this paper analyzes the factors affecting horizontal well borehole cleanness， and puts forward the technical scheme for cuttings flow measurement based on cuttings sweeping， solving the problem of incomplete dumping of rock cuttings in the previous process of rock cuttings flow measurement with reduction of the manual cleaning frequency. Based on the return rate of rock cuttings， the quantitative monitoring method of wellbore cleanness and wellbore stability has been established， and the risk monitoring and evaluation method of wellbore cleanness and wellbore stability formed. Through the field application test， the risk of wellbore uncleanness and wellbore instability has been successfully warned， which proves that the method established in this paper can be applied to the field construction.