Multi-lateral Well Of Fish-bone Optimal Design On Track

Typical well-branch technological of the Fish bone caused widespread concern in the oil industry, and the track designed of the well drilling project before the drilling is the first key. Therefore,the branch of the well to carry out research designed to optimize the track for the branch well drilling technology is of great significance.This paper based on the the fish bone branch well of Shengli Oilfield which has been drilled, we detailed discuss the track type and reservoir adaptability of the fish bone-branch well . the design of the track need to considered reservoir geology factors and their mutual influence,summed up the fish bone-branch well design principles, methods and steps.Research the branch patterns from the capacity and tools,the shape parameters are the length of branch well, branch angle, the number of branche hole , the number of branches, the spacing of branch wells. Get the production impaction law from different parameters on the form of fish-bone branches ,I analyse the branch angle, branch length and branch bending, slope-made tools with compass software, the results for the multi-branch horizontal wells to optimize the design parameters of the form is great significance.In view of three-dimensional characteristics of fish bone branch wells, focus on the three-dimensional design and calculation methods, and sub-track design and calculation methods.The methods provide a theoretical basis for computer programs, it can be widely applied in the actual design.At the same time on the basis of the conceptual design,establishing an all-hole track of the most optimal design models and introduce optimization multiplier method to optimize the design of the hole track.For mechanical properties of fish bone branch of the hole section , research the stress distribution regular pattern of the branch connection. Using finite element analysis the radius of curvature and sidetrack position of the wall connecting the impact of stress distribution, and destructiveness and regular pattern of changes on the connection, while summed up the most stable of the hole when the best side branches along the drilling position is the greatest level of stress direction.Well branch of fish bone-optimal design on track design has been successfully applied in the eight wells of Shengli Oilfield, and have obtained very good drilling results.