Cementing formations with medium to high gas migration severity in cold conditions is considered a very challenging operation for major operators in Turkmenistan. The liquid gas migration agents used in Turkmenistan for the above mentioned severities incur additional operational and technical challenges, particularly during the winter months as the ambient temperature falls below zero. In addition to the climatic challenges, Turkmenistan drilling activity often encounters the additional challenges of high pressures and narrow pore / frac windows.

This paper focuses on case studies to analyze the application of both liquid and solid gas migration prevention additives compared with conventional slurry systems in overcoming challenges encountered while cementing across gas bearing formations. To address such challenges, a solid polymer gas migration prevention additive has been field tested successfully in environments such as Canada, USA and Russia having similar conditions as Turkmenistan. A description is then given of a successful method of combining a special solid polymer based gas migration prevention system with good cementing practices, in order to not only achieve the primary objective of the cementing operation, but also yield improved logistics in terms of storage, handling, and no associated mix fluid aging or detrimental effect of thawing. Field case histories are presented, illustrating the versatility of the system in solving gas migration problems in seasonal climate changes.

Above all, solid gas migration prevention polymers are considered the best cost effective solution compared to the liquid gas migration agents of the same family which is considered as the key value for commercial oil and gas production.

You can access this article if you purchase or spend a download.