Research and Experiment of Hydraulic Injection Double-Seal Single-Card Driving Fracturing Technology in Tight Horizontal Wells

In view of the large number of horizontal Wells with casing loss and casing leakage, conventional pumping bridge plug or coiled tubing bottom seal drag fracturing technology is often unable to be implemented, If the method of casing subsidy or conventional double-sealing and single-layer fracturing is used, There are many problems such as many procedures, high labor intensity, low construction efficiency and high operation cost. To solve the above problems, This paper presents a hydraulic injection double-seal single-card drag fracturing technique for tight oil horizontal Wells, Dragged string multi-stage hydraulic sandblast perforation and double seal fracturing can be achieved in a single trip string, Through process and tool optimization, At present, the highest design of this technology string is level 3, And can meet the 4–6 stage perforation fracturing construction. Field tests show that this technology can meet the demand of efficient fracturing and reconstruction of tight oil horizontal wells with casing loss and casing leakage.