牛东火山岩油藏压裂效果影响因素研究

Influence factors on postfracture response in the volcanic reservoir of Niudong area

针对牛东火山岩的储层特征,开展了优化选井选层、优化压裂规模和裂缝形态、解除堵塞等研究和矿场试验,并在全面总结区块前期压裂井的基础上,研究了影响压裂效果的主要因素。研究表明,牛东火山岩油藏孔隙特征和储层类型是影响压裂效果的关键因素,缝洞发育的储层压裂效果好,目前采用的大规模水基液体压裂工艺技术对地层伤害小,能够有效沟通缝洞,适应区块火山岩油藏改造的需要,可继续在该区块推广应用。

A series of studies and field experiments has been conducted for Niudong volcanic reservoir in respects of optimization of candidate wells and layers,fracturing scale and fracture morphology,and blockage removal etc.The influence factors on postfracture response are studied based on previous fracturing operations in this area.It is concluded that pore character and reservoir type are key influence factors on postfracture response.The reservoir with well-developed cavities and fissures tends to attain an encouraging response.Massive hydraulic fracturing has low damage to reservoir and can effectively connect cavities and fissures.It is suitable for stimulation in volcanic reservoirs and can be spread in Niudong area.