辽河坳陷火山岩油藏勘探压裂配套技术与应用

Fracturing Technique and its Application ofV olcanic Oil Reservoir inL iaohe Depression

针对辽河坳陷火山岩“低、深、硬、厚、漏”的油藏特点和“高储层温度、高施工泵压、高流体滤失、高启裂梯度、高砂堵几率”的压裂难点,确定了大排量、中低砂比、大规模、造长缝的压裂改造主导思想,以使压裂裂缝尽量多、尽量远地沟通天然微裂缝和溶孔,达到提供油流通道的目标。形成了抗高温、抗高压、抗砂堵、降滤失、降启裂、快返排的火山岩压裂改造“三抗二降一快”主体工艺,大大提高了火山岩压裂的施工成功率和措施有效率,在现场进行了大量的推广应用,取得了良好的增储上产效果。

The volcanic oil reservoirs are characterized by low permeability, deep burial depth, tighter rocks, thick oil-bearing intervals and developed natural fracture and solution pores, and which have some difficulties such as high temperature of reservoir, high pumping pressure, high fluid loss, high fracture initiation gradient and high rate of sand up while fracturing. Aiming at the mentioned features above, it is determined the main guiding thinking of large drainage volume, medium-low ratio of sand and creating long-fracture to make much more fractured fissures form and communicate with natural fractures and solution pores as far as possible, so as to realize the goal of forming oil flow pathway. The volcanic fracturing technique, mainly characterized with anti-high temperature, anti-high pressure, anti-sand up, reducing fluid loss, dropping opening and fast back drainage, has been formed and popularized widely on-sites to raise largely the success rate and availability in volcanic fracturing construction , while also make the effect of increase reserves and output well.