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新型通道压裂支撑剂铺置试验
温庆志1,杨英涛1,王峰1,段晓飞1,杨柳1,金占鑫2
(1.中国石油大学石油工程学院,山东青岛 266580;2.中国石油大学科学技术研究院,山东东营 257061)
摘要:
为了解决常规高速通道压裂技术存在的加砂及泵注程序复杂、纤维要求高等问题,提出支撑剂在裂缝中实现不连续充填的新方法,应用可视化裂缝模拟装置开展新型支撑剂铺置的室内试验,同时运用标准API裂缝导流能力测试仪分析新型铺置方式下的裂缝导流能力。结果表明:新型支撑剂铺置方式可实现不连续充填,且形成的充填层导流能力在低压(5 MPa)及高压(60 MPa)下均有优于常规支撑剂连续铺置时的表现;一定范围内增大溶解性支撑剂比例和粒径可以形成更高的通道率;影响新型不连续充填层导流能力的因素主要有通道收缩、支撑剂间的压实和支撑剂破碎,当闭合压力较低时,通道的收缩及支撑剂间的压实起主导作用,当闭合压力较高时,支撑剂破碎起主导作用。
关键词:  压裂  溶解性支撑剂  导流能力  通道率
DOI:10.3969/j.issn.1673-5005.2016.05.013
分类号::TE 357.1
文献标识码:A
基金项目:山东省自然科学基金项目(ZR2012EEM001)
Experimental study on an innovative proppant placement method for channel fracturing technique
WEN Qingzhi1, YANG Yingtao1, WANG Feng1, DUAN Xiaofei1, YANG Liu1, JIN Zhanxin2
(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Institute of Science and Technology in China University of Petroleum, Dongying 257061, China)
Abstract:
In order to simplify the proppant placement procedure during the application of the high flow channel fracturing technique and reduce the requirements on high pumping rate and high fiber quality, an innovative proppant placement method that adopts discontinuous proppant pumping and packing in fractures was proposed. The feasibility of this method was verified via a visual experiment. The flow conductivity of the proppant packed channel with discontinuous proppant placements was analyzed using a standard API fracture flow conductivity device. The results show that the new method can form discontinuous packed layer in the fracture channel using different proportional soluble proppants, in which high flow conductivity was observed under both low and high pressure conditions (5 MPa and 60 MPa). The higher of the soluble proppant ratio and size, the higher of the channel conductivity is. The influence factors on the flow conductivity of the discontinuous packed layer include the shrinking of the fracture channels, the compaction and crush of the proppants. The channel shrinking and proppant compaction can be induced at low closure pressures, while the crush of the proppants can occur at high closure pressures.
Key words:  fracturing  soluble proppant  flow conductivity  channel ratio
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