Abstract: This paper presents the micro well group conception to describe the typical injection-production well patterns for herringbone branch horizontal well. The analysis of the injection-production relation, flow behavior of the micro well group is made and its injectionproduction relation is optimized using numerical simulation method. Based on these, the sensitivity of angle of injection-production well, branch length and branch location of the herringbone well is studied. The adjusting strategies are proposed, and the result shows that the efficiency of the new well pattern is effectively improved.

Key words: branch well, horizontal well, well pattern, numerical simulation, injection-production well relation