Drilling and Completion Technology for a Two-Branch Multi-Lateral Ultra-Short Radius Horizontal Well:Maojia 6582, Daqing Oilfield

To further improve ultra-short radius horizontal well technology, the Daqing Oilfield team designed a two-lateral ultra-short radius horizontal well for Maojia 65-82. They designed it with two branches to improve the yield of a single well. In order to overcome the difficulties of well trajectory control and difficulties of sealing branch holes and windows due to different curvature radius in the two branched holes, the inclination angles between the drill bit and the guide pipe were designed to meet the requirement of buildup. They combined the optimum design for the casing program which was completed incorporating well profiles and well trajectory optimum design based on the original borehole conditions of the well. As a result, the upper and lower branches with radius of curvatures of 5.9 m and 3.2 m were completed successfully in the Well Maojia 65-82. The initial daily oil production in the Maojia 65-82 was 2.5 t, which is 8.3 times higher than that of the original borehole. At present, daily oil production is 1.0 t and cumulative oil production is 380 t. The completion of the multilateral ultra-short radius horizontal well Maojia 65-82 with two branches may provide a new method for exploitation of residual oil in the Daqing Oilfield.