复杂小断块油藏水平井井网开发效果研究

针对复杂小断块油藏地质构造、流体性质、油水系统等特点，通过分析研究水平井与直井夹角、渗透率、有效厚度、水平井段长度、油水粘度比、直井完井井段等因素与注采井距的关系，研究不同条件下直井注水、水平井采油和直井采油、水平井注水2种组合井网的开发规律，找到合理的井网组合形式。研究证明，油藏的采出程度随着渗透率的增加、水平井段的增长、油水粘度比的减小而不断提高，有效厚度对采出程度影响不大。采用直井注水、水平井采油的组合井网可以更充分地发挥直井和水平井的双重优势，极大地提高复杂小断块油藏的采收率。

THE EFFECTIVENESS OF DEVELOPING COMPLEX SMALL FAULT BLOCK OIL RESERVOIR WITH HORIZONTAL WELL PATTERN

The unique feature of complex small fault block oil reservoir is complex geological structure,complex fluid property and complex oilwater system and so on.By analyzing and researching the relationship between the angles of horizontal well and vertical well,permeability,net thickness,the length of horizontal hole section,oil/water viscosity ratio,vertical well completion section and injector and producer distance,development methods of two kind of horizontal well pattern are researched and reasonable pattern is determined.The result indicates that,with the increase of permeability and the length of horizontal hole section,the decrease of oil/water viscosity ratio,the degree of reserve recovery continuously raises.The influence of effective thickness on the degree of reserve recovery is not severe.And horizontal well and vertical well pattern can exert the double advantage of horizontal wells and vertical wells more fully and enhance oil recovery greatly.