地面微地震监测技术在五宝浅006-1-H1井加砂压裂改造中的应用

Surface microseismic monitoring technology and its application to sand fracturing in Wubaoqian 006-1-H1 well

在天然气开发过程中,压裂工艺是增产提效的关键措施,压裂产生的裂缝和压裂规模是评价压裂效果的参考依据,常规电位法压裂监测技术不能完全监测裂缝的长度﹑高度﹑宽度和方位角,而地面微地震监测技术能较好地解决上述问题。在五宝浅006-1-H1井加砂压裂改造中:(1)通过微地震事件分布位置、数量关系及响应特征,及时优化调整压裂施工参数;(2)通过微地震事件点评价暂堵转向工艺应用效果和不同暂堵剂暂堵效果。应用结果表明:(1)在地面微地震监测指导下,五宝浅006-1-H1井本井压裂造缝效果明显,裂缝平均延伸长度约为369 m,井筒西侧裂缝延伸平均长度约140 m,东侧延伸平均长度约220 m,整体东侧延伸大于西侧;(2)压裂改造效果较好,不含天然缝储层改造体积约2778×10^(4)m^(3),含天然裂缝储层改造体积约为4254×10^(4)m^(3),井筒东侧较西侧改造更充分。

Fracturing as the fundamental way in natural-gas development may increase both production and efficiency.Moreover,both induced fractures and fracturing size act as considerable reference for evaluating a fracturing effect.Some common-used fracturing monitors,for example potential method,can not better survey fracture parameters including length,height,width and azimuth.But,these problems can be solved by means of one technology called surface microseismic monitoring.And it has been applied to sand fracturing in Wubaoqian 006-1-H1 well.After its application,the fracturing parameters were optimized and adjusted promptly on the basis of the distribution,quantity,and response natures of microseismic events.In addition,one effect of temporary plugging way and the other plugging effect of various temporary plugging agents were assessed by the events.Results show that(1)with the help of surface microseismic monitoring,several visible fractures may be induced after the fracturing in Wubaoqian 006-1-H1 well.The fracture length hits about 369 m on average,140 m for west side of wellbore and 220 m for eastern wellbore,respectively.And the length in the east side exceeds that in the west;and(2)a better fracturing effect has been attained.There is about 2,778×10^(4)m^(3)for the stimulated reservoir volume without nature fractures and 4,254×10^(4)m^(3)for the stimulated reservoir volume with nature fractures,showing better fracturing effect in eastern side.