«Onshore and offshore oil and gas well construction»

Results of geophysical surveys of casing strings in production wells of the Astrakhan gas concentrate field with C2b design horizon

UDC: 622.24
DOI: -

Authors:

¹ Gazprom VNIIGAZ, Moscow, Russia
² Gazprom Invest, St. Petersburg, Russia

Keywords: Astrakhan gas condensate field, inter-formation fluid flows, inter-annular pressures, assessment of the quality of casing strings cementing, well logging (WL)

Annotation:

The authors of the article consider the results of geophysical studies to assess the quality of primary cementing of casing strings in production wells of the Astrakhan gas condensate field with the design horizon C2b. It is shown that the design buffer and plugging materials do not improve the quality of wells primary cementing under these conditions. The currently used design materials and technologies cannot ensure reliable protection of the subsoil and the environment by preventing leaks in the annular and inter-annular spaces during pressure testing, gas and water flows between horizons with different pressures, inter-annular pressures and behind-annular manifestations. To eliminate the occurrence of various complications during primary cementing of casing strings in the mining-geological conditions of the Astrakhan gas condensate field, new highly effective compositions of buffer and cement mixtures and technologies for their application are needed. The article is a continuation of the article "Analysis of technological solutions for cementing production wells in mining-geological conditions of the Astrakhan gas condensate field with C2b projected horizon".

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