«Onshore and offshore oil and gas well construction»

Assessment of the quality of casing strings primary cementing in wells of Kovyktinskoye gas condensate field and recommendations to its improvement

UDC: 622.24
DOI: -

Authors:

¹ Gazprom VNIIGAZ, Moscow, Russia

Keywords: buffer mixture, expanding cement mixture, Kovyktinskoye field, geophysical well logging (GIS), interlayer fluid flows, inter-casing pressures, assessment of casing strings cementing quality

Annotation:

The authors of the article consider the results of geophysical studies to assess the quality of production wells’ casing strings primary cementing, conducted in Kovyktinskoye gas condensate field using a "light" design. It is shown that the design buffer and plugging materials fail to provide an increase of primary well cementing quality under these conditions, therefore new powdered erosive buffer and expanding plugging mixtures and technologies for their application are recommended. The use of new mixtures and technologies will eliminate the occurrence of various complications during the process of casing strings primary cementing in the mining and geological conditions of Kovyktinskoye field. New technologies of casing strings primary cementing when using powdered expanding grouting mixtures are fundamentally different from all known technologies using shrinkage or low-expansion stones for use in a wide range of pressures and temperatures. The article is a continuation of the article "Analysis of design materials and technologies for primary cementing of production wells using a "light" structure in the conditions of Kovyktinskoye gas condensate field".

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