基于小型测试对压裂地质特征分析的现场施工

On site construction of fracturing geologic characteristic analysis on small scale test

为了提高长庆油田低孔、特低渗、低压油藏压裂规模,优化施工参数,获得较好的压裂效果,采用FracproPT10.2压裂软件对长庆董志、姬塬油田低渗储层3口探井实施的活性水、压裂液测试压裂进行了解释分析,结果显示该区储层岩石具有破裂压力和闭合应力低、近井筒弯曲摩阻小的岩石力学性质,停泵后裂缝中的净压力小,裂缝延伸不明显等力学特征及储层特低渗、滤失系数小等地层特性。依据对储层压裂特征的认识及分析获得的参数,对3口井的施工设计进行了优化及现场实施,压后试油日产分别为33.9m3、26.5m3和17.5m3,成为长庆油田2005年的3口高产井,为探井压裂进行储量评估和该区以后水力压裂设计提供了重要依据。

In order to improve the fracturing scale of low porosity, extra low permeability and low pressure reservoir, and optimize construction parameter, FracproPT10.2, a kind of fracturing software, is applied to analyze the active water and fracturing liquid test fracturing of three exploration wells in low permeability formation in Dongzhi and Jiyuan oilfields of Changqing. The results show that the reservoir rock in this region features in low burst pressure and closure stress, low bend friction near well-hole, low net pressure in the fractures after stopping pump, no evidence on fracture expansion, low filtration coefficient etc According to the recognition of fractured reservoir characters and the parameters, the construction design of three wells are optimized and implemented. The daily output of these three wells after fracturing are 33.9m3,26.5m3, and 17.5 m3 separately. The three wells became the high output wells in Changing Oilfield in 2005. The application results provide important basis for the reserves evaluation of fractured exploration wells and the later hydraulic fracturing design of this region.