论文部分内容阅读
2013年以来在葡萄花油田扶余油层垣A和葡B两个试验区开展了水平井开发现场试验。致密油特殊的存储渗流特征导致其开发规律与常规油藏有很大区别,为保证长期稳产,进行了致密油水平井压后合理工作制度研究。通过地层供液量与流压、产出量与流压关系特征,将水平井生产阶段划分为主缝供液阶段、缝间渗流阶段及基质渗流等3个不同时期,在综合研究分析基础上,结合试验区地质、生产综合情况,制定了5种类型水平井3个不同生产阶段对应的合理生产参数。基于水平井产量递减规律研究,结合试验区水平井生产动态特征分析,初步认为:钻遇好、初期产液量高、稳产期长的井可先短关恢复,压力恢复至地层压力60%后开井,供液能力持续变差后再进行长关;而钻遇较差、稳产期较短的井建议进行长关,压力恢复至地层压力80%后开井,并相应调小参数,以保持平稳生产。
Since 2013, a field trial of horizontal well development has been carried out in two pilot areas of Puyu Huayu A and B in Putaohua Oilfield. Due to the special reservoir seepage characteristics of tight oil, the regularity of its development is very different from that of conventional oil reservoirs. In order to ensure long-term stable production, a reasonable working system of tight oil well after pressure welling has been studied. Based on the relationship between fluid supply and flow pressure, output and flow pressure, the production stage of horizontal well is divided into three stages: fluid supply in main seam, seepage in seam and matrix seepage. On the basis of comprehensive research and analysis , Combined with the geology and production comprehensive situation in the experimental area, reasonable production parameters corresponding to 3 different production stages of 5 types of horizontal wells were formulated. Based on the study of decreasing productivity of horizontal wells and combining with the analysis of production characteristics of horizontal wells in the pilot area, it is preliminarily considered that the wells with good drilling performance, high initial liquid production and long stable production period can be resumed shortly after the pressure is restored to 60% of formation pressure Open well, continuous deterioration of liquid supply and then long off; and drilling less well, stable short-term wells proposed long-term closure, the pressure back to formation pressure 80% open the well, and adjust the parameters accordingly to Maintain stable production.