«Oilfield engineering»

Ensuring the tightness of wells for methane extraction from coal beds

UDC: 622.279.34
DOI: -

Authors:

¹ North Caucasus Federal University, Stavropol, Russia
² Azerbaijan Technical University, Baku, Azerbaijan

Keywords: coal seams, methane, leakages, well, construction, production, quality, tightness

Annotation:

The authors of the article consider the problems of methane leakage during its extraction from coal seams as well as methods for improving the quality of wells that significantly reduce hydrocarbons emissions into the atmosphere. It is stated that a necessary condition for eliminating hydrocarbons leakage is guarantee of well lining tightness. The issue of the possibility of creating sealed lining elements – casing columns and cement shells – during wells construction is studied. The main factors determining the loss of casing columns tightness and the conditions of its occurrence are given. A well is considered as a source of fluid leakage in two aspects – as a source of measurable and non-measurable hydrocarbon leakages. The fluid leaks prevention when operating methane-producing wells is determined by the conditions ensuring the tightness of its lining. It is substantiated that the choice of wells design should take into consideration the mining-geological conditions of the developed deposit and the technical-technological influencing factors. It is revealed that fluid leakage occurs in any place of a multi-component (multi-layered) structure – behind a single casing string or simultaneously behind several casing strings, where the conditions for fluid migration are formed. The approaches to ensuring wells lining tightness when recovering methane from coal seams and a method for assessing their quality have been proposed.

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