MULTI-INTERVAL FRACTURING TECHNIQUE IN HORIZONTAL WELL OF DAQING OIL FIELD

Multi-interval fracturlng technque in horizontal well includes two methods:casing distributary fracturing and double-packer-single-stlcking fracturing. This paper introduces the technical principle, design principle, consideration factors of tools systems of these two methods, analyzes the applicatlon effect of them ln three wells. The test shows that casing distributary fracturing is safe in construction, can be carried out in large displace-ment and high sand ratio. can increase productivity 1argely, and is the optimum fracturlng method for horizontal well. The characteristics of this technique is to determine the fractur-ing project at the same time of compiling completion project, it requires that several intervals are fractured safely at one tlrne in a longer well interval. As one of the standby techniques,double-packer-single-sticking fracturlng is mainly used for potentiallties tapping at latter stage of exploltation.