Estudio de factibilidad para la implementación de la tecnología casing-drilling en pozos direccionales en las secciones de 16” y 12 1/4” en el campo Libertador

Abstract

The project’s main objective is to analyze the feasibility of implementing casing-drilling technology in types "J" and "S" directional wells in sections 16" and 12 1/4" in Libertador oilfield in order to reduce drilling times and costs. In the next drilling campaign two wells were considered for the analysis, a "J" type well and "S" type well. Specialized torque, drag and fatigue simulators were used to determine whether the casing and its connection might suffer some kind of failure. Simulators such as "TDF Analysis (Tenaris™)" and "Casing driller" (Schlumberger™) were used. As a result of the simulations it was determined that only the 16” section of the “J” type well is feasible for the implementation of such technology. The other section (12 ¼”) was not technically feasible. Considering the results of simulations and the trajectory of the well it has been decided to use casing-drilling level III, which consists in drilling the hole using a Retrievable BHA set into a profile located in the first section of the casing shoe. To accomplish full setting success an element called DLA (drill lock assembly) is used against the profile at the casing section. One finished the drilling operation, the BHA is retrieved by two possible means: Wireline and drillpipe. With the implementation of this technology it is possible to eliminate wiper trips before running the casing in hole. Enhancements on ROP’s have been recorded during the application of this type of techniques. Moreover, economic analysis show representative savings compared to conventional drilling procedures.