小间距双井水溶造腔腔体扩展特性

搭建了小井间距双井水溶造腔的实验装置,通过室内模型实验的方法研究了不同提管方式时溶腔腔体扩展的变化规律,并与单井造腔工艺进行了对比.结果表明:只提注水管时,腔体体积增长速率大于另外两种提管方式,最终形成的腔体体积也最大;不同提管方式对盐壁的溶解速率影响较小,腔底形成的溶蚀角相差也不大;同时提两管与只提注水管形成腔体形状为"船"形,提油垫时形成底部区域很大而上部为两个"塔"形的腔体形状;与单井造腔技术相比,小井间距双井水溶造腔技术在造腔前期具有较大的优势.

Properties of Two-Well Dissolution Cavity-Building Expansion with Small Well Space

The experimental device of two-well dissolution cavity-building with a small spacing was set up， and the law of cavity volume expansion in different casing arrangement was studied by model test. The results indicate that cavity volume growth rate of only injecting the inlet is greater than that of the other two ways， and the cavity volume reaches to the biggest eventually. Different casing arrangements have little effect on the dissolution rate of salt wall as well as the dissolution angle in the bottom of the cavity. Injecting the two wells at the same time and injecting the inlet only form a cavity of a shape of “ship”.There will form a cavity of two “towers” in the top and a large cavity at the bottom when injecting the oil. Compared with the single well technique， two-well dissolution cavity-building expansion with a small well spacing technology has a great advantage at the early stage.