间歇注汽法—提高蒸汽驱效果的重要方法

蒸汽突破后,采用间歇注汽方式,可以达到抑制汽窜,提高蒸汽比容、波及体积、干度,油相相对渗透率,热利用率及自渗吸驱油之目的,从而提高稠油蒸汽驱开采效果.河南井楼油田零区试验区采用间歇注汽法取得了显著的效果.现场试验及数模研究结果表明,对薄层稠油油藏来说,合理的间歇注汽方式是每注30天,停30天,间歇注汽阶段合理的注汽速度应为连续注汽速度的1.5倍;对大型蒸汽驱开发单元来说,同一排注汽井为一注汽单元,相邻两排注气井的注汽时间应重复50%.

INTERMITTENT STEAM INJECTION-AN IMPORTANT METHOD FOR ENHANCING STEAM FLOODING EFFICIENCY.

After steam breakthrough, intermittent steam injection process can control steam channeling, enhance steam specific volume, sweep volume, steam quality, oil phase relative permeability and thermal efficiency, and establish the mechanism of imbibition displacement. It performed well while used in the pilot Area 0 of Jinglou oilfield. Field test and numerical simulation study showed that the optimized intermittent steam injection cycle is 30 days in thin heavy oil reservoir and steam injection rate should be 1.5 times as continus steam injection rate; in a large-sized waterflooding block, the injection wells at a row are designed as a unit, and the injection period in two adjacent rows of steam injection well should superimpose by 50% .