一致入孔深穿透刺激流聚能装药在页岩气藏中的应用

Wang Changshuan, Guo Hongzhi, Jiao Guandong, Niu Yuanyuan, Xie Mingzhao
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摘要

针对页岩气水平井射孔簇水力压裂效率低的问题,引入了具有一致井眼和深穿透能力的Stimstream聚能装药,分析了其特殊性能。分别进行了地面靶材试验和现场试验,比较了该药与国产常规深侵药的性能。在地面混凝土靶材试验中,Stimstream聚能药在0°、90°、180°、270°相位的平均孔径分别为9.4mm、9.3mm、9.3mm、8.9mm,常规深侵装药在0°、90°、180°、270°相位的平均孔径分别为9.3mm、8.6mm、6.5mm、7.0mm。结果表明:无论射孔枪与套管间隙大小如何,射流聚能在套管上形成均匀的大孔;通过三次现场测试,对比了S3406D Stimstream装药与国产SDP35HMX25聚能装药的现场数据,结果表明,S3406D可将平均水力击穿压力分别降低2044.5 psi、1189psi和1261.5psi,将泵支撑剂的平均处理压力分别降低696psi、652.5psi和928psi。在降低水力压裂过程中页岩气地层破裂压力和处理压力方面效果显著。
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Application of Stimstream Shaped Charge with Consistent Entrance Hole and Deep Penetration in Shale Gas Reservoir
To address the issues of inefficient hydraulic fracturing on perforation clusters in shale gas horizontal wells caused by the inconsistent size of entrance holes on the casing, Stimstream shaped charge providing consistent hole and deep-penetration was introduced and its special performance was analyzed. Surface concrete target test and field test were conducted respectively to compare the performance between this kind of charge and conventional deep penetration charges made in China. In surface concrete target test, the average hole diameter of Stimstream shaped charge in 0°, 90°, 180°, 270° phasing is 9.4mm, 9.3mm, 9.3mm, 8.9mm, the average hole diameter of conventional deep penetration charges in 0°, 90°, 180°, 270° phasing is 9.3mm, 8.6mm, 6.5mm, 7.0mm respectively. The results shown that Stimstream shaped charge can provide uniform and big holes on the casing regardless of different clearance between perforating gun and casing. In three field testings, comparing the field data of S3406D Stimstream charge and domestic SDP35HMX25 shaped charges, it proven that S3406D can reduce the average hydraulic breakdown pressure by 2044.5 psi, 1189psi and 1261.5psi respectively, and reduce the average treatment pressure to pump proppant by 696psi, 652.5psi and 928psi respectively. It has remarkable effectiveness on reducing the breakdown pressure and treatment pressure of shale gas formations during hydraulic fracturing operation.
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