The soluble bridge plug produced by our company is currently widely used in the central and western oil and gas fields of China. At present, it has more than 2,600 wells. The customers are mainly oil companies under PetroChina and Sinopec. In June 2018, Schlumberger was in Sichuan XX well uses 3 types of 95 type bridge plugs of our company.
At present, the largest amount of wells used is 80% of the total shale gas exploration and development, followed by conventional horizontal well fracturing with 17% and special operating wells of 3%.
At present, the deepest well depth is 6150m, (3600---6075m), the horizontal well section is 2000m----2700m, the highest well bottom temperature is 150°C, (currently the maximum temperature of the bridge plug seal is 105°C). Withstand the maximum pressure difference of 70Mpa.
The effective sealing time of the bridge plug is 36 hours after entering the well, and the dissolution time is 10-15 days after entering the well. Because the bridge plug is affected by the bottom hole temperature and the liquid chloride content of the bottom hole, the dissolution time of each well is different. After dissolution, the largest residue is the upper and lower slips. The glue barrel and the main body of the bridge plug dissolve into liquid and discharge with the wellhead. The dissolved solution of the bridge plug is non-polluting and meets environmental protection requirements.
At present, the 95,99,102 bridge plugs are mainly pumped by Baker's No. 20 standard tool, which is suitable for most uptilt and downhole wells.
Due to the exploitation of shale gas, the casing deformation phenomenon often occurs during the fracturing process. Our company specially developed the 85 type bridge plug. The outer diameter of the bridge plug is 85mm and the maximum pressure difference is 60 trillion after the 5 inch casing (inner diameter 114mm). bar. Type 85 bridge plugs and hydraulic setting tools are sent by coiled tubing. At present, most sets of wells can be sealed with 85 bridge plugs.
In July 2018, the XX well string was jammed at 4983.6 meters underground, and the corrosion of the bridge plug was recovered after 120 hours of salvage.
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