低渗透砂岩储层低伤害缓速酸研究与应用

由于煤层发育、软地层等原因使压裂技术尚未突破。针对宝浪油田低孔、低渗—特低渗储层岩屑含量高、孔隙中充填物含量多、孔喉半径小、通道中杂质含量高的地质特点和对酸化技术要求,研究出了一种新型低伤害缓速酸实现深部酸化。该酸液具有对岩石溶蚀能力强、缓速性能好、表面张力低、防乳破乳率高、易返排的特点。在宝浪油田应用中取得好的增产效果,为低渗透砂岩油气藏开发提供了技术支撑。

STUDY AND APPLICATION OF LOW DAMAGE RATARD-ED ACID IN LOW PERMEABILITY SANDSTONE RESER-VOIR

Hydraulic fracturing has been unsuccessful because of coal-bed and soft formation in Baolang Oilfield. A new type retarded acid with low damage has been studied, which is aimed at the formation characteristics of high detritus content, more filling substance in porous, small pore and throat radius and high impurity substance in the pore and throat in low porosity and permeability reservoir. Results by experiment has shown thatthe retarded acid is of high corro-sion capacity to rock, low reaction velocity and interface tension,high anti-emulation and breaker effect, easy to discharge from the formation. It has been proved that it is a newtechnique for exploitation of Baolang low permeability reservoir.