Application of sectional fracturing technique with coiled tubing and bottompacker in Jinghe Oilfield

Chang-8 oil reservoir of Jinghe Oilfield belongs to low-porosity and super-low permeability reservoir. In earlier stage, the sectional fracturing treatment with open hole packer gained a good effect, but the facture starting position of this technique is ambiguous and full opening of wellbore cannot be achieved. In order to improve oil recovery, the author puts forward “sectional fracturing technique with coiled tubing and bottom packer”. In this technique, the coiled tubing, tools of sandblasting and perforating, and the bottom packer are connected, sandblasting and perforating are realized by injection through tubing, sand fracturing is achieved by injection from annular space, the layers being fractured are isolated by using bottom packers, to realize stepwise staged fracturing from bottom to top. This technique is characterized by significant fracturing fracture significant, well-directed formation reformation and fast operation speed. Application testing for JH2P20 well shows that by this technique, the transition layer fracturing could be finished in 30 min. Under normal condition, 9-interval fracturing can be completed within one day. After fracturing, the wellbore full opening will be performed. This technique has high promotion value in Jinghe Oilfield.