Abstract The oil and gas industry needs continuously improving in the exploration and extraction methods with a special care and strong compromise to maintain the equilibrium with environment. Based on that mission, and in compliance with the Parex Resources Greenhouse Gases and Climate strategy, Parex Resources executed the first multilateral drilling project in Colombia. It was an ambitious and challenging exploration campaign. The goal was to improve the exploration area by drilling multiples branches through different geological units and total vertical depths (TVD) into an overpressured naturally fractured field. The field presented a complex geological and structural environment. Expectations were high for both drilling optimization and formation evaluation of a compartmentalized reservoir, looking to cover the highest extension while drilling fewer wells from the surface. Considering the level of the challenge ahead, the solution was articulated in three critical fronts:Develop a vigorous planning with service company and operator engineering team for casing design, mud weight window and system, bottomhole assembly (BHA) design, and fit for purpose technology for directional drilling operations.Include a full set of logging data with reliable logging-while-drilling (LWD) tools and advanced mud logging services to fulfill geology requirements, as no wireline logging was planned due to constrains in a horizontal borehole.Implement well placement services with the most experienced team to geo-steer based on real-time data completely integrated for precise interpretation. The operational efficiency achieved was beyond expectations in all areas of well construction, not to mention the project cost reduction through the multilateral approach, preventing to drill three wells from surface. In this case, three different geological compartments were explored from one surface location. This innovative exploration approach also brought important gains on the environmental impact as surface operations were dramatically minimized compared to conventional exploration. This strategy helped the operator and service company to reduce the carbon footprint, simply by reducing the number of wells and operational days needed to explore new fields.