纤维对高导流裂缝压裂影响的实验研究
投稿时间:2021-03-02  修订日期:2021-07-12  点此下载全文
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郭兴 陕西延长石油(集团)有限责任公司研究院陕西 西安 710065
陕西省陆相页岩气成藏与开发重点实验室陕西 西安 710065 
710065
张建忠 陕西延长石油(集团)有限责任公司延长气田采气四厂陕西 延安716000 716000
孙晓 陕西延长石油(集团)有限责任公司研究院陕西 西安 710065
陕西省陆相页岩气成藏与开发重点实验室陕西 西安 710065 
710065
马中国 陕西延长石油(集团)有限责任公司延长气田采气四厂陕西 延安716000 716000
穆景福 陕西延长石油(集团)有限责任公司研究院陕西 西安 710065
陕西省陆相页岩气成藏与开发重点实验室陕西 西安 710065 
710065
张明 陕西延长石油(集团)有限责任公司延长气田采气四厂陕西 延安716000 716000
刘佳丽 陕西延长石油(集团)有限责任公司延长气田采气四厂陕西 延安716000 716000
基金项目:国家科技重大专项“延安地区陆相页岩气勘探开发关键技术”课题四“非均质陆相页岩气储层压裂改造配套工艺技术”(编号:2017ZX05039-004);陕西省创新能力支撑计划项目“CO2压裂井筒温压及地层波及规律研究”(编号:2019KJXX-023)
中文摘要:纤维是油气井高导流裂缝压裂施工成功的最关键影响因素之一。为了优化高导流裂缝压裂工艺技术和施工参数,开展以纤维为主要影响因素的高导流裂缝压裂室内物模实验,分析纤维对高导流裂缝压裂的影响变化规律。实验表明:加入纤维可以明显提升压裂液携砂性能和效率,纤维浓度越高,支撑剂铺置越靠近裂缝中前端,促使压裂中造长裂缝;固定纤维加入比例越大,裂缝通道占有率越大,而非固定纤维加入比例的楔形方式,其通道占有率最高,压裂中采用高纤维比例楔形加入方式,有助于形成高导流裂缝;排量过大或者过小,通道占有率均减小,实验条件下最优排量为5.0 m3/h;通道占有率沿裂缝延伸方向呈先增加后减小趋势,最大值均出现在裂缝中部位置,最小值均在裂缝缝口处,纤维比例和施工排量均不影响高导流裂缝中通道占有率高低分布趋势。
中文关键词:储层改造  纤维  高导流裂缝  压裂  支撑剂
 
Effect of fiber on fracturing of high conductivity fractures
Abstract:Fiber is one of the key factors for successful fracturing of high conductivity fractures in oil and gas wells. In order to optimize the fracturing technology and operation parameters for high conductivity fractures, laboratory physical model experiment with fiber as the main influencing factor was carried out to analyze the influence of fiber on proppant placement and channel occupancy in high conductivity fractures. The experimental results show: Adding fiber can significantly improve the sand carrying capacity and efficiency of fracturing fluid. The higher the fiber concentration is, the closer the proppant is placed to the middle and front of the fracture, which promotes the formation of long fractures in the fracturing process. The larger the constant adding proportion of fiber, the larger the occupancy rate of the fracture channel. However, the non-constant addition proportion of fiber provides the highest channel occupancy in the wedge-shaped way. In fracturing, the wedge-shaped addition method with high fiber proportion is helpful to form high conductivity fractures; over large or over small displacement will lead to less channel occupancy; and under the experimental conditions, the optimal displacement is 5.0 m3/h. The channel occupancy increases first and then decreases along the fracture extension direction with the maximum value in the middle of the fracture, and the minimum value at the crack opening. The fiber proportion and pumping rate do not affect the distribution trend of channel occupancy in high conductivity cracks.
keywords:reservoir stimulation  fiber  high conductivity fracture  fracturing  proppant
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