Problems and Developing Direction of Anti-Collision Technology in the Dense Well Pattern Area

摘要

Unexpected wellbore collision will bring potential or even catastrophic consequence to human beings and environment, the well-bore anti-collision technology is an effective approach to reduce this kind of accident, the function of which is specially important during the process of infill development drilling and multi-well drilling. Through the analysis of existing anti-collision technology, the conclusion can be gotten that the failure of well bore anti-collision is brought by 4 factors which include the big error of survey steering tool data.low accuracy , distortion or loss of adjacent wells' trajectory parameters.the over-idealized pathfitting method and the defective scanning method for anti-collision.The causes of failure of anticollision is the fitted path based on the low accuracy parameters and over-idealized path-fitting method cannot be equivalent to the actual ones.and the relative positions of distorted well trajectories cannot reflect the facts either .This paper discusses the development tendency of anti-collision technology in the future and puts forward the concept of active anti-collision.The paper also lists programs which probably solve the anti-collision problem and provide the reference to the pertinent research.