天然气地球科学 ›› 2022, Vol. 33 ›› Issue (4): 512519.doi: 10.11764/j.issn.1672-1926.2021.11.005
Huaicai FAN(),Jian ZHANG,Shengjie YUE,Haoran HU
摘要:
以页岩气平台井组井间干扰影响因素为研究对象,利用数值试井分析技术,研究了不同储层基质渗透率、压裂改造参数、井间距、激动强度等参数对井间干扰的影响程度。在此基础上,掌握了页岩气水平井不同生产时间的压力分布特征,明确了井间干扰对气井最终可采储量(EUR)的影响程度,形成了综合考虑气井EUR和井控地质储量采收率的井距优化分析方法。结果表明:在天然裂缝不发育、井间人工缝网未沟通的情况下,压力波在改造区外传播范围有限,页岩气平台井组井间干扰强度一般较弱,在改造区及其附近压降程度最大,优化井距时不仅要考虑井间是否有压力干扰响应,更要考虑压力干扰的强度;天然裂缝越发育、压裂改造范围越大,则井间干扰越明显,优化井距要综合考虑天然裂缝发育程度及压裂改造范围的影响;受井间干扰影响,气井EUR随井距增加而增加、但增加幅度逐渐变小,采收率则随井距增加而下降、下降幅度逐渐增大;需要根据平台井组地质工程特征,综合考虑气井EUR和井控地质储量采收率优化井距。
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