Technology of weighted fracturing fluid for Well DG2

The fracturing interval of Well DG2 is 6 433.50 m to 6441.00 m with layer temperature of 174.5 ℃. The prediction ground operation pressure could reach to over 140 MPa by using fracturing fluid of conventional density, and it exceeds the maximum rated work pressure 140 MPa of fracturing equipment, high pressure manifold and wellhead at present. In order to successfully carry out the fracturing task of this well, the pressure-bearing capacity of these equipment were all equipped to 140 MPa; meanwhile, the recipe of weighted fracturing fluid with density over 1.40 g/cm3 was got and spot preparation technology was researched by laboratory testing. The successful operation of fracturing stimulation for this specific well has provide valuable experience of fracturing operation for super-high ground operation pressure.