Reduction of Well Construction Time with Innovative Design: Tot-3p (True One Trip - 3 Phases)

Abstract

Drilling wells with TOT-3P design consists of optimizing (reducing) the steps of well construction. Drilling takes place in 3 sections (3P=3 phases) and the completion, sand containment screen plus production column (upper and lower), is performed in a single trip (TOT = True One Trip). The construction of wells in 3 sections is only possible with the deepening of the casing of the second section of the well and the capacity of this casing to have the function of surface and production. Some challenges stand out this project, such as the gain of inclination, cleaning and stability of the open well in a riserless phase, in addition to the need to return cement to the mud line for structural purposes and guarantee the solidarity set of barriers. Because drilling has only three sections, the shoe surface/production casing should be deepened in such a way that it is competent to withstand the production loadings, the pressure influence of injector wells and compose the solidary set of barriers (SSB) for abandonment, as well as enable the installation of components of the tubing at the required depth, such as the gas lift mandrel (GLM). To analyze the feasibility of the TOT-3P project, some points are studied: Analysis of flow potential of the shallow sands crossed in section II;Surface/production casing shoe racing analysis for well construction and for well productive life;Depths of tubing modulates (PDG, chemical injection mandrel and gas lift mandrel) to meet production monitoring, combat fouling and well production. Thus, integrated strategies for Drilling, Fluids and Cementation were defined in order to obtain the objectives mentioned through a bore caliper with diameter that allows a good cementation to be performed and obtained a satisfactory result in the cementation evaluation profiles, leading to the return of cement to mud line and composition of 2 solidary sets of barriers in annular above the reservoir.