川西中浅层井低密度支撑剂脉冲压裂技术

Pulse fracturing technology with low-density proppant for mid-shallow wells in western Sichuan Basin

四川盆地低渗气藏运用脉冲压裂技术取得了降本与增效的双重效果,为了经济高效地对低渗气藏进行开发,将低密度支撑剂运用到脉冲压裂中。室内实验和软件模拟结果表明纤维加量是影响通道率的主要因素;长度9 mm纤维加量为0.5%时,支撑剂砂团的稳定性较好;对于低密度支撑剂脉冲压裂,采用间隔液用量递增工艺时,有利于形成开放式流动通道网;脉冲间隔2~2.5 min,排量3~5 m^(3)/min时,为最优工艺参数。在中江气藏沙溪庙组进行了4口水平井的现场应用,平均无阻流量增幅显著,压裂增产效果良好。该技术对川西中浅层低渗致密砂岩水平井压裂具有一定指导作用。

Pulse fracturing technology has been applied in low-permeability gas reservoirs of the Sichuan Basin,with lower cost and higher efficiency.To develop low-permeability gas reservoirs more economically and efficiently,low-density proppant was used in pulse fracturing.The results of indoor experiment and software simulation show that the fiber dosage is the main factor affecting the channel rate.When the dosage of fiber with the length of 9 mm is 0.5%,the stability of proppant sand mass is better.For pulse fracturing with low-density proppant,the process of increasing the amount of spacer fluid is conducive to the formation of open flow channel network.When the pulse interval is 2-2.5 min and the displacement is 3-5 m^(3)/min,the operation parameters are optimal.The technology was applied in 4 horizontal wells in Shaximiao Formation of Zhongjiang gas reservoir,demonstrating that the average open flow increases significantly and the fracturing stimulation effect is good.This technology has a certain guiding significance to the fracturing of horizontal wells in mid-shallow low-permeability tight sandstone reservoirs in western Sichuan Basin.