Profile control technique for steam channeling challenge in small well spacing huff-and-puff in offshore ultra heavy oil reservoirs
For the first ultra heavy oil reservoir produced by large-scale thermal recovery in the Bohai Sea,the inter-well steam channeling rate during the initial round of steam injection was over 70%,negatively impacting the oilfield productivity.In response to this issue,based on exploration and logging data,evaluations of agent performance,single/double tube displacement experiments and on-site channeling control applications were successively carried out.After further understanding the physical properties of the layers with a high-water content,foam profile control,numerical simulation of well group simultaneous injection and on-site experiments were then conducted,and the inter-well steam channeling was effectively controlled.The results show that the average permeability of locally low permeability reservoirs with high water content after steam flushing was equal to or higher than the measured values during the exploration stage.Implementing simultaneous injection measures for wells experiencing steam channeling and employing enhanced foam profile control for unaffected wells and peripheral wells did not only effectively control and prevent steam channeling,but also uniformly produced the reservoir,with steam entry profile range of the dominant intervals decreased by 46.8%.The research results show that the technological strategy of foam profile control combined with well group simultaneous injection can increase single well production by 12%to 33%,providing a guidance for the efficient development of offshore ultra heavy oil.
offshore ultra heavy oilsteam huff and puffinter-well steam channelingwell group simultaneous injectionfoam profile control
万方数据
维普
