A Quantitative Monitoring and Evaluation Technology for Hole Cleaning of Horizontal Well
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摘要:
为了监测和评价水平井井眼清洁程度，研制了岩屑返出量监测装置，以准确监测岩屑返出情况。基于岩屑返出量数据和工程录井实时采集的数据，建立了岩屑返出量监测装置在2种工作模式下，倾倒时段漏接岩屑补偿方法与实际返出岩屑体积计算方法；基于岩屑返出率与掉块监测结果，研究形成了水平井井眼清洁定量化监测评价技术。该技术在川南泸州区块多口页岩气水平井进行了应用，实现了监测井段岩屑返出体积与返出率实时准确监测，并多次预警井眼清洁异常情况，保证了水平段的顺利钻进。水平井井眼清洁定量化监测评价技术为水平井井眼清洁程度监测及卡钻复杂风险预防提供了一种新的技术手段。
Abstract:A high-accuracy cuttings return monitoring device was developed to monitor and evaluate the hole cleanliness of horizontal wells, and to monitor the cutting return accurately. The compensation method for missing cuttings during a dumping period and the calculation method of the actual cuttings return volume were established for the monitoring device in two operation modes with the cuttings return data and the real-time data of engineering logging. A quantitative monitoring and evaluation technology for the hole cleaning of horizontal wells was developed depending on the results of the cuttings return rate and sloughing monitoring. This technology was applied in multiple horizontal shale gas wells in the Luzhou Block, Southern Sichuan, which enabled the real-time accurate monitoring of cuttings return volume and return rate in monitored well sections. It gave many early warnings regarding abnormal hole cleanliness, ensuring smooth drilling in horizontal sections. The proposed quantitative monitoring and evaluation technology for hole cleaning of horizontal wells provided a new technical means for monitoring the hole cleanliness of horizontal wells and preventing sticking and other complex risks.
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Keywords:
- horizontal well /
- hole cleaning /
- cuttings return rate /
- monitoring /
- pipe sticking
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图 2 井眼清洁状态分析评价及技术措施决策流程
Figure 2. Flow of analysis and evaluation of hole cleanliness and technical measure decision
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