大庆西部斜坡区稠油油藏热采开发界限研究

Boundary values of thermal recovery methods in Daqing western slope reservoirs

按照我国现行的蒸汽吞吐筛选原则,大庆西部斜坡区稠油油藏90%以上不能进行整体热采开发。文中运用技术界限与经济界限的研究方法,通过数值模拟和统计学手段,确定影响热采开发效果的主控因素;推导了水平井、直井蒸汽吞吐开发的多元界限公式;计算得出在不同油价下的开发界限值。通过界限研究,对西部斜坡区稠油油藏有利区块进行了潜力评价,A37区块进行了注蒸汽热采开发,采出程度11.74%,累积油汽比0.358 m3/m3,获得较好的经济效益。研究成果对于提交该油藏探明储量和推进动用进程具有指导意义。

According to the screening principle of huff and puff method, more than 90% of the western slope reservoirs in Daqing Oilfield cannot be developed entirely. Based on numerical simulation and statistical method, the main effect factors on thermal recovery can be determined by technical and economic boundary research. The multiple threshold formulas of huff and puff for horizontal or vertical well were deduced, by which calculation of the boundary values was obtained under different oil prices. Through the study of boundary values, the potential reservoirs in Daqing western slope were evaluated. The research results are as follows： through huff and puff method, the oil recovery of A37 Block is 11.74%, and the gas-oil ratio is 0.358 m^3/m^3. The research results are very important for submitting proven reserves and promoting development process.