01490nab a2200253 4500 20260520004532.0 260224s2015 xxu ing Inglés Resing system facilitates shut-off of difficult gas well feb. 2015 19/09/2017 ; 19/09/2017 3 p. ; 101-104 Recent studies have shown an increase in the percentage of wells affected by sustained casing pressure, over time. Both the oil and gas industry, and governments, are studying the causes of sustained casing pressure, and methods to help prevent undesired flow that can, potentially, result in the loss of wellbore integrity and environmental problems. In northern Colombia, natural gas fields have been developed for decades. However, as a result of mechanical problems, or low economic return rates, some producing wells have been abandoned. Some of the wells were abandoned using conventional cementing techniques without success, resulting in gas communication, through the annulus, to the surface. In some cases, this even has been observed where the primary top of cement (TOC) was planned to surface. 2 World Oil ARTICULO Urdaneta, J.A. 57314 Arroyave, J.M. 57315 Jones, P. 29477 Amaya, J.L. 57316 Coral, A. 57317 Hernandez, H. 57318 191222 191222 0 0 0 0 259041 BAAB BAAB 2026-03-06 200063495 0 200063495 2026-03-06 00:21:47 2026-03-06 ARTICULO