Research and application of fine staged fracturing technology in high angle deviated well

Jidong Oilfield belongs to a typical complex fault block oil reservoir, with reservoir burial depth of 3 300-4 400 m, temperature of 120-150 ℃, strong sensitivity, reservoir thickness of 1.2-4.0 m, and longitudinal span of 200-300 m.It is mainly used artificial island and onshore platform development.The average deviation of well is above 35°, and the natural productivity of a single well is low, which can only be achieved after fracturing.A kind of temporary plugging diversion agent is developed due to thin interlayer, casing damage well and the well with special completion methods.Organic silicon monomer is introduced to micelle polymerize strong deformation gels.The strongly transformable and expandable temporary plugging agents with different sizes used in the mouth and inside of cracks were obtained by shearing, granulating, drying and crushing.The proportion of particle (5-6 mm), fiber and powder (0.106-0.212 mm) is 5:1:1.The maximum breakthrough pressure of temporary plugging agent between clusters researched 56.3 MPa.In the process of hydraulic fracturing, high-inclination wells are prone to multiple fractures, fracture distortion, abnormal construction pressure, sand plugging and other problems.Equipped with the controllable K344 packer in high-inclination wells, it has the functions of step by step setting, step by step fracturing and step by step release.An ultra-low concentration of watermelon gum fracturing liquid system is optimized, which can reduce the amount of thickening agent by more than 30%.And through the proppant slug grinding and other measures, the formation of high temperature highly deviated well fine stage fracturing technology.