双封隔器分层压裂工艺技术研究与应用

RESEARCH AND APPLICATION OF SEPARATE ZONE FRACTURING WITH DUAL PACKER

针对单封、填砂、投球、桥塞、限流压裂及其组合等压裂方式存在投球量难以确定、不能保证压开所有的目的层和油层改造不彻底等问题 ,通过对水力锚、喷砂器、安全接头以及封隔器等井下工具的组合优化 ,并优选出有机硼低伤害压裂液配方 ,研究了双封压裂工艺技术。该项技术克服了其它形式分层压裂的弊端 ,具有针对性强、安全性好 ,工艺效果突出等特点。现场应用取得了明显的技术经济效益。

Separate layer fracturing technology is main technical means of Ⅱ?Ⅲ reservoir stimulation.Single packer fracturing,gravel input fracturing,ball-off fracturing,bridge plug fracturing,limited entry fracturing and their combination have been used previously,but it can't ensure to treat all planned target zone.Sometimes,because ball number is difficult to detemine,success ratio of fracturing treatment has been influenced.In order to solve this problem,separate layer fracturing technology with dual packer is developed.New fracturing string consists of hydraulic anchor,sand blower,safety joint and packer.Field test has used borate crosslinking fracture fluid.This novel fracturing technology has some advantages,such as terget zone can be fully treated,operation is safe and treatment effect is very good.Field test confirms that fracturing success ratio is 100% and production of single well increases by 7.8t and cumulative incremental oil has reached to 2324.7t.