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Research and Practice of Horizontal Wellbore Cleaning Technology
LI Zhenchuan , YAO Changshun , HU Kaili , LAN Zuquan
Xinjiang Oil & Gas
2022, 18 (1):
48-53.
DOI: 10.12388/j.issn.1673-2677.2022.01.008
In recent years，
the large-scale development of unconventional oil and gas resources in China has led to a sharp increase in the number of horizontal wells. Due to the lack of scientific and systematic understanding on horizontal well bore cleaning，
drilling process in horizontal section often appears stuck，
completion ahead of schedule，
disability of running casing to the predetermined well depth. In addition，
poor wellbore cleaning can also cause very high implicit costs，
including ROP controlling，
increasing time consumption of reaming，
circulation，
and tripping. In this paper，
by clarifying the mechanism of cutting migration in different sections of horizontal wells，
analyzing the key elements of wellbore cleaning and proposing a method to evaluate wellbore cleaning by monitoring actual drilling friction，
a set of efficient horizontal wellbore cleaning technology has been formed. Field practice in Mahu and Jimsar shale oil has verified the technical theory based on field data，
which can guarantee the cleanness of horizontal section under the conditions of existing domestic equipments and instruments，
and greatly ruduce inefficient production time consumption such as mud circulation and wiper tripping to increase speed and efficiency.
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