Production well constitutes an important and expensive civil engineering structures linking earth’s surface with a layer of the collector in the development of oil and gas fields and underground gas storage in porous structures with production-capacity in underground storage of oil and gas in rock salt. The stability of the borehole, i.e., the implementation of forementioned functions is determined by the ability of structural elements to perceive the internal load and the external load from the enclosing rock mass without excessive deformation and without being destroyed.
The sustainability of the well is one of the priority scientific and technical tasks at oil and gas production and underground storage. The task of ensuring the stability of the borehole occurs at the stage of drilling, which is accompanied by processes of deformation and fracture of the borehole walls and adjacent rock. The article deals with the problem of ensuring the stability of the open wellbore at the stage of drilling.
The article considers critical conditions of the wellbore. The conditions and nature of destruction of the wellbore and near-wellbore array are established depending on the level of the initial stress state, the strength properties of enclosing rocks and of the specific weight of drilling mud. Chart of stability of the open wellbore to quantify the maximum and minimum densities of the drilling mud ensuring the stability of the borehole walls is proposed.
Recommendations can be used in the design of wells, forecast of geological complications, planning of measures on prevention of complications and emergencies, as well as activities and liquidation of their consequences.


Well, gas storage, stability, geomechanical processes, critical status, voltage, mud, underground gas storage, drilling, open hole well.

Issue number: 4
Year: 2017
UDK: 532.546
Authors: Khloptsov D.V.

About authors: Khloptsov D.V., Graduate Student, e-mail:, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

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