页岩气长水平段加密井压裂工艺实践及认识
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摘要
基于国外页岩气田开发经验,长水平段加密井开发已经成为XX页岩气区块增产稳产的有效途径。以焦页X井为试验对象,进行了页岩气长水平段加密井压裂工艺试验。压裂曲线显示,加密井与主体区井(母井)在相似施工条件下,因母井压裂导致地应力变化,压裂施工曲线存在差异;暂堵转向压裂工艺试验表明,采用投球暂堵工艺,单段3级均开启了不同的裂缝系统;微地震以及示踪剂监测结果表明,加密井与母井的井距,以及母井的累产气量,可能是导致子井裂缝延伸产生差异的重要原因。
Based on the development experience of foreign shale gas fields, the development of long horizontal infill wells has become an effective way to increase and stabilize production in XX shale gas block. The fracturing technology test of long horizontal shale gas infill wells is carried out in Jiaoye X Well. Fracturing curves show that under similar construction conditions, the fracturing construction curves of infill wells and main area wells(mother wells) are different from each other due to the stress changes caused by the mother wells fracturing. The test of temporary plugging and turning fracturing technology shows that different fracture systems are opened in each stage of 3 stages with the pitching-aided temporary plugging technology. Microseismic and tracer monitoring results show that the spacing between infill wells and mother wells and the cumulative gas production from mother wells may be the important reasons for the differences in fracture extension in sub-wells.
Based on the development experience of foreign shale gas fields, the development of long horizontal infill wells has become an effective way to increase and stabilize production in XX shale gas block. The fracturing technology test of long horizontal shale gas infill wells is carried out in Jiaoye X Well. Fracturing curves show that under similar construction conditions, the fracturing construction curves of infill wells and main area wells(mother wells) are different from each other due to the stress changes caused by the mother wells fracturing. The test of temporary plugging and turning fracturing technology shows that different fracture systems are opened in each stage of 3 stages with the pitching-aided temporary plugging technology. Microseismic and tracer monitoring results show that the spacing between infill wells and mother wells and the cumulative gas production from mother wells may be the important reasons for the differences in fracture extension in sub-wells.
引文
[1]陈作,王振铎.水平井分段压裂工艺技术现状及展望[J].天然气工业,2007,27(9):78-80.
[2]邵尚奇,田守嶒,李根生,等.水平井缝网压裂裂缝间距的优化[J].石油钻探技术,2014,42(1):86-90.
[2]邵尚奇,田守嶒,李根生,等.水平井缝网压裂裂缝间距的优化[J].石油钻探技术,2014,42(1):86-90.