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以往的钻关井泄压均采取放溢流泄压方法进行泄压,但受环保等因素限制,该区块主要采取关井自然泄压。为了寻找适合低渗透油层的钻关方法,尽量减少钻关带来的不利影响,在整个钻关期间,根据钻关井压降时间、压力变化、溢流量情况及油水井的地层发育和连通关系等因素分析,积极探索新的、适用于外围低渗透油田的钻关泄压方法,有效缩短钻关周期,保证钻井进度,同时使加密井区及时恢复注水,延缓老井产能递减速度。
In the past, both drilling and pressure relief wells adopted pressure relief and relief pressure relief method, but due to environmental protection and other factors, the block mainly adopted natural pressure relief wells. In order to find out the drilling method suitable for low permeability reservoirs and minimize the adverse effects of drilling, the drilling pressure, the overflow and the relationship between the formation and connectivity of oil and water wells And other factors, we actively explored a new drilling pressure relief method suitable for low permeability peripheral oil fields, effectively shortening the drilling cycle and ensuring the drilling progress. In the meantime, the infill wells were reinstated in a timely manner to slow down the decline rate of the productivity of the old wells.