«Onshore and offshore oil and gas well construction»

Problems of primary cementing of horizontal gas production wells at the Kharasaveyskoe gas-condensate field

UDC: 622.24
DOI: -

Authors:

¹ Gazprom VNIIGAZ, Moscow, Russia
² National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: spacer mixture, expanding cement slurry, geological conditions, Kharasaveyskoye gas condensate field, inter-layer fluid flows, inter-casing pressures, wells operation complications

Annotation:

The authors of the article consider the design of spacer and plugging materials used in primary wells cementing in the Kharasaveyskoe gas condensate field. Designed cementing materials, under varying pressures and temperatures in the annular and inter-annular spaces, produce cement stones with high volumetric shrinkage, with the effect of chemical reagents on its increase, thus leading to various complications occurrence during the primary cementing process. Consequently, they cannot ensure reliable protection of the subsurface and the environment by ensuring the tightness of casing strings, their annular and inter-annular spaces or the required isolation of fluid-containing horizons–primarily gas- and water-saturated horizons. A significant improvement of primary casing strings cementing quality in mining and geological conditions of the Kharasaveyskoye gas condensate field can be achieved by the rational selection of new compositions of spacer and cementing mixtures and improved technologies of their practical application, ensuring operational reliability and increasing wells flow rates.

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