Abstract:
The staged fracturing technique of pumping type composite bridge plug is applied in Renmi 1H well of Huabei Oilfield. After fracturing and blow-off, the sand jamming occurs to the bridge plug, thus the drilling bridge plug is required to increase the output. According to the analysis of characteristics of staged fracturing techniques for bridge plug, the difficulties in drilling the bridge plug are found and relevant schemes are formulated. According to the well condition, the techniques of coiled tubing with bottom screw drill and ordinary tubing with screw drill and home-made cyclone four-wing concave bottom mill shoe are applied for bridge plug drilling of Renmi 1H well and Taimi 1X well to consecutively drill five or four bridge plugs with one pipe string and to carry out construction quickly and safely.