The Aguada Pichana Gas field is located in the center of the prolific Neuquén Basin, in Argentina. It produces gas and condensate through monobore completions. Since 2006, an increase in liquid loading has become an issue in current wells conditions, resulting in the need of reducing production tubing size to enable stable gas production for continuous liquid removal. Following analysis, the appropriate solution resulted in running a velocity string (VS) as an effective means for liquid removal at current and future production conditions. The challenge was to find a hanger system, which would allow, without killing the well, to hang a 2.0-in[CSH1] CT VS. Additionally, the hanger should facilitate unloading the well by circulating nitrogen and restore the production rate without the need to recover the VS.
After a field trial, the first phase of the campaign has been completed with the introducion of a special designed fluted seal and retrievable CT VS hanger system (quantity: 20 jobs), and second phase of campaign (quantity: 60 jobs) with a low cost and locally manufactured reliable system. The paper describes the operational planning, different hanger systems, deployment methods and lessons learned after more than 80 jobs.
Number of Pages
Sanchez, Raul, Agut Regis, Coulon David, Sentinelli Roberto. 2007."New methodology of effective hydraulic fracturing in high thickness formation". Article SPE-107392-MS, presented at SPE Latin American & Caribbean Petroleum Engineering Conference, Buenos Aires, Argentina, 15-18 April. https://doi.org/10.2118/107392-MS
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