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Integrated Loss Control and Prevention Technologies for Complex Deep Wells Based on Precise MPD by Wang, Gang ;Fan, Honghai ;Zhang, Wei ;Yang, Yang ;Han, Zili ;Wu, Hongxuan ;Li, Wanjun ;Li, Jiaying ;Zhou, Tuo ;Zhou, Haiqiu ;Liu, Jitong is a scholarly article available to read on EtoBox.

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## Abstract M15 well contains complex intervals, where anticlinal structures developed from faults make long mudstone barriers full of cracks, which makes it hard to predict pore pressure. Loss is one of the most serious problems during drilling and cementing, while blow out accidents happen sometimes. Previous casing programs hardly adjust to all complex intervals and conventional LCMs (loss control materials) play few roles. As a result, designated targets used to be rarely reached. It is proved that low pressure intervals shall be isolated firmly and complex intervals as well as reservoirs should be developed in independent intervals, thus casing programs have been modified. 188 lab tests were finalized, including 180°C hot rolling, anti-contamination test, lubricity test and inhibition experiments, in order to develop a kind of organic salt mud system that has premium inhibition, plugging, lubricating, heat & salt resistance properties. Precise MPD (managed pressure drilling) techniques are recommended to achieve near-balance drilling operation, solving borehole instability problems to some extent. In the second interval the organic salt mud system is applied, while logging and

Author

Wang, Gang ;Fan, Honghai ;Zhang, Wei ;Yang, Yang ;Han, Zili ;Wu, Hongxuan ;Li, Wanjun ;Li, Jiaying ;Zhou, Tuo ;Zhou, Haiqiu ;Liu, Jitong

Publisher

Society of Petroleum Engineers

Published

2019

Language

EN