辽河油田超稠油油藏开采方式研究

辽河油田杜８４ 块兴隆台油层是一个超稠油油藏。由于地下原油粘度大，流动性差，因此常规直井蒸汽吞吐效果很差，平均周期油汽比只有０．３５。为了提高蒸汽吞吐开采效果，在油田现场采取了一系列技术措施，包括采用高效真空隔热油管、加深注汽管柱、采用大泵抽油等，措施后，周期油汽比提高到了０．５５９。同时，根据该油藏地质特征及原油性质，研究并试验了水平井注蒸汽开采、成对水平井蒸汽辅助重力泄油、水平裂缝辅助蒸汽驱及垂向燃烧辅助水平井重力泄油等新技术及开采方式。结果表明，水平井技术与重力泄油相结合，将是提高厚层超稠油开采效果的一种主要方式。

New Technology study for the development of a supper heavy oil reservoir in Liaohe oil field.

Xinglongtai Formation in Du 84 block, Liaohe oil field is a super heavy oil reservoir. Because of high viscosity and low mobility of oil in the reservoir, the conventional steam stimulation performance with vertical wells was not good, with average oil steam ratio per cycle only of 0.35. In order to improve steam stimulation efficiency, a series of technical measures have been taken in the field, including using high performance vacuum heat insulating tubing, deepening steam injection string and employing large capacity pump etc.. By adopting these measures, the steam stimulation efficiency was improved, leading the oil steam ratio increase to 0.559. Meanwhile, according to the reservoir and its fluid properties, some new technologies and methods have been studied and tested, such as steam injection recovery with horizontal wells, Steam Assisted Gravity Drainage (SAGD), Fracturing Assisted Steam Drive (FAST) and Combustion Override Split production Horizontal well (COSH) process etc.. The results indicated that the combination of horizontal well technology and gravity drainage will be the major recovery methods for enhancing recovery effectiveness of super heavy oil reservoir.