GJ油田G6断块低中渗透油藏高效开发实践

GJ油田G6断块为一整装的低、中渗透油藏,开发初期利用油藏数值模拟技术,确定较为合理的开发政策界限,实施早期注水开发。开发过程中,针对储层特点,实施了有效的油层保护和改造措施,及时调整、细分开发层系,完善注采井网,注水开发后油藏保持着高产稳产的良好开发态势。油田开发12年中有10年采油速度保持在1.7%～2.3%,含水上升率控制在3%左右,各项开发技术指标达到或好于理论预测值。

中、高渗透油藏压裂作用机理探讨

根据中、高渗透油藏的压裂特点，一方面，分析了中、高渗透油藏近井地带流体的流动模式、裂缝对油藏出砂的控制机理、岩石破坏机理。另一方面，还讨论了裂缝缓解或避免岩石破坏的作用、裂缝对降低流体携带微粒能力的作用、裂缝支撑带对地层微粒的桥堵作用以及压裂对减轻生产过程中油藏深部伤害的作用机理。并利用该机理指导了高１７－９等四口井的压裂设计和施工，其中，在高１７－９井的施工过程中，加石英砂１０．３３ｍ３、涂料砂０．５ｍ３，仅用压裂液４３ｍ３，结束时压力升高明显，１年累计增油近２０００ｔ，取得了较好的增油效果，为应用上述机理指导其它中、高渗透油藏的压裂防砂取得了宝贵经验。

中高渗强边水油藏合理采液强度研究

D油田是一边底水发育、处于中含水采油期的中高孔、中高渗透率、强边水油藏。对于此类油藏,开发中主要存在的矛盾是:既要保证油田高速高效开发,又要控制边水过快、过早上升。在实际生产过程中,D油田单井、区块液量与含水相关性很强,这说明该油田存在一个最佳的采液强度。针对上述问题,本文通过对构造位置与含水上升速度的关系、含水上升率与采液强度的关系等研究,确定了D油田合理采液强度,有效控制了单井的含水上升速度,提高了断块的开发效果,并为同类油藏开发提供经验。

葡萄花油田重复压裂裂缝酸洗技术探讨

葡萄花油田随着开发时间的延长，老井出现低液面，低流压、采液和采油指数下降、综合含水上升、产量递减率增大，这直接影响油田开发效益和最终采收率，对油田稳产造成严重威胁。作为中、低渗透油层，改造挖潜措施之一的重复压裂改造技术，面临着如何保证中、低渗透油田重复压裂效果，提高经济效益的技术难题，而重复压裂技术需要解决的一个难点是裂缝清洗，葡萄花油田由于大部分井都属于重复压裂，有的层甚至已经是三次、四次压裂，压裂效果逐年变差。通过多方面的分析论证，认为该油田压前裂缝酸洗是经济有效的，文中较系统地分析葡萄花油田重复压裂裂缝酸洗技术。

Simultaneous hydraulic fracturing of ultra-low permeability sandstone reservoirs in China: Mechanism and its field test

Based on the impact of the stress perturbation effect created by simultaneous propagation of multiple fractures in the process of simultaneous hydraulic fracturing, a thorough research on the mechanism and adaptation of simultaneous fracturing of double horizontal wells in ultra-low permeability sandstone reservoirs was conducted by taking two adjacent horizontal wells(well Yangping-1 and well Yangping-2 located in Longdong area of China Changqing Oilfield) as field test wells. And simultaneous fracturing optimal design of two adjacent horizontal wells was finished and employed in field test. Micro-seismic monitoring analysis of fracture propagation during the stimulation treatment shows that hydraulic fractures present a pattern of complicated network expansion, and the well test data after fracturing show that the daily production of well Yangping-1 and well Yangping-2 reach105.8 t/d and 87.6 t/d, which are approximately 9.4 times and 7.8 times the daily production of a fractured vertical well in the same area, respectively. Field test reflects that simultaneous hydraulic fracturing of two adjacent horizontal wells can enlarge the expansion area of hydraulic fractures to obtain a lager drainage area and realize the full stimulation of ultra-low permeability sandstone reservoirs in China Changqing oilfield. Therefore, simultaneous fracturing of two adjacent horizontal wells provides a good opportunity in stimulation techniques for the efficient development of ultra-low permeability reservoirs in China Changqing oilfield,and it has great popularization value and can provide a new avenue for the application of stimulation techniques in ultra-low permeability reservoirs in China.

面四区沙四段3砂组北部开发特征及潜力分析

八面河油田面四区沙四段3砂组属于中-低渗透油藏,由于平面上储层物性、厚度、原油性质差异大,导致各区域采出程度差值大,平面矛盾突出。通过对该砂组上不同砂岩有效厚度内油井的开发特征进行分析,圈定现阶段能实现有效经济开发区域,对其剩余油分布进行研究,提出下步挖潜对策。