碳酸盐岩气藏加砂压裂重复改造试验效果分析

EXPERIMENTAL EFFECT ANALYSIS FOR REPEAT TREATMENT OF SAND FRACTURING IN CARBONATE GAS RESERVOIR

针对碳酸盐岩气藏部分气井生产效能低的状况,决定在长庆气田下古生界尝试开展加砂压裂重复改造试验,以期提高低产、低效气井的产量,延长气田稳产期。通过潜心研究、精细设计及现场质检监控,优选了4口老井进行加砂压裂重复改造现场试验。从试验结果来看,虽然只有1口井取得明显的改造效果,但4口井加砂压裂施工都是成功的,说明对碳酸盐岩气藏实施加砂压裂是可以实现的,但在选井思路和压裂工艺方面还有待探索和研究。

Lower Paleozoic in Changqing Oilfield belongs to carbonate gas reservoir.In order increase the production in low-yield,low-efficiency gas wells and extend the stable production period in the oilfield,repeat treatment of sand fracturing has been carried out in the reservoir due to low production efficiency in some gas wells.4 old gas wells were chosen optimally for repeat treatment after the further research,meticulous design and on-site quality monitoring.Experimental results show that sand fracturing is success for the 4 wells although only 1 well obtains an obvious treatment effect.They also illustrate that sand fracturing is available in carbonate gas reservoirs,however,well-chosen thoughts and fracturing treatments should be further studied.