摘要
我国致密气、页岩气等非常规天然气资源储量是常规天然气的5倍,开发潜力巨大。高效开发页岩气资源的最大难点之一是如何形成复杂裂缝,沟通天然裂缝、微细孔隙空间。从水击效应、压力波动等角度综合分析能够快速定性判断压裂改造效果。裂缝复杂程度越高,压力水击振幅越大(大于60 MPa),衰减时间越短(小于30 s),响应事件越多;粉砂段塞打磨,压力降低约3.5 MPa,陶粒段塞支撑新缝,压力波动大于2 MPa。基于后期产能数据进行反演,页岩气储层改造有效动用储层厚度薄(6~10 m),纵向未得到有效延伸,有效裂缝半长较短(100m左右),储层非均质性强,水平渗透率4.2×10^-5~2.9×10^-4m D。通过多角度快速有效分析现场施工情况,后期产能评价,正确认识改造效果与储层特性,为后续施工达到高产目的奠定基础。
In our country,the unconventional natural gas reserves such as tight gas and shale gas are 5 times that of conventional natural gas.One of the most difficult problems for the efficient development of shale gas resources is how to form complex fractures that communicate with natural fractures and fine pore spaces.From the point of view of water hammer effect and pressure fluctuation,the effect of fracturing can be determined quickly.The higher the degree of complex fracture,the higher the water hammer pressure amplitude(more than 60 MPa),and the shorter the decay time(less than 30 seconds),and in response to the incidents are more,while silt slug grinding,the reducing pressure is about 3.5 MPa,and when the ceramsite slug supports joints,the pressure fluctuation is greater than 2 MPa.Based on the data of inversion of post production capacity,layer thickness of shale gas reservoir is thin(6-10 m),so the longitudinal extension has not been effective,and effective fracture half length is relatively short(about 100 m),and reservoir is aeolotropy-horizontal permeability of 4.2×10^-5 to 2.9×10^-4 m D.Through the multi angle analysis of the site construction situation and the evaluation of the later production capacity,the effect of stimulation and reservoir characteristics are understood correctly to achieve the purpose of laying the foundation for high yield for the subsequent construction.
作者
曾凌翔
郑云川
蒲祖凤
龚顺祥
李松林
ZENG Lixiang;ZHENG Yunchuan;PU Zufeng;GONG Sunxiang;LI Songlin(CCDC Downhole Service Company,Chengdu,Sichuan 610051,China)
出处
《钻采工艺》
CAS
北大核心
2020年第2期72-74,I0020,共4页
Drilling & Production Technology
基金
“十三五”国家科技重大专项“长宁-威远页岩气开发示范工程”之课题5“复杂山地工厂化钻完井作业模式与应用”(编号:2016ZX05062-05)
中油油服统筹科技项目“川渝页岩气综合提速提效压缩工期综合配套技术研究-页岩气压裂施工参数优化提速研究”(编号:2019T-003-002-3)
井下作业公司科技项目“页岩气加砂压裂施工预警技术及配套软件研究”(编号:JX2019-4)。
关键词
页岩气
水击
压力
产能
分析
shale gas
water hammer
pressure
productivity
analysis
