低渗透油气藏压裂返排一体化工艺技术

Integration Technology for Low Permeability Reservoir Fracturing Flowback

随着油田的不断勘探开发,大量优质的低渗透油气藏被发现。酸化压裂是针对这类储层的主要增产措施,但若这类油气藏压裂后不能及时返排出压裂液,就会污染地层。因此为减少对地层的污染、缩短作业周期,研发了压裂抽汲联作抽油泵技术,并配套应用连续抽油杆和探井连续试油装置,实现了酸化、压裂措施管柱与抽油、试采生产管柱一体化。现场应用表明,采用低渗透油藏压裂返排一体化工艺技术实施后转抽时间由原来的平均6.9 d缩短为19 h,缩短了排液周期,减少了地层污染,改善了压裂效果。

In continuous exploration and development of oil fields,found are a large number of high-quality low permeability reservoirs.Fracture acidizing is the main measures for increasing yields in development of such reservoirs.However,if fracturing fluid can not be flowed back after such reservoirs are fractured,the formation will be polluted.For this reason,developed is the united oil pumping technology to shorten the test cycle and the continuous sucker rod and continuous exploratory well testing device are used along with the technology to integrate measures for acidification,fracturing string and sucker and trial production pipe string.Field application results show that implementation of the technology can shorten the transferring time from the average 6.9 days in the past to 19 hours,shorten liquid drainage period,reduce formation pollution and improve the effect of fracturing.