Feasibility study of volume fracturing in offshore low-permeability reservoir
Producing oil and gas reserves in low-permeability reservoirs is the key to increasing offshore oil and gas reserves,and production for conventional oil and gas resources discovered in the sea is becoming less and less.Producing oil and gas reserves in low-permeability reservoirs depends on hydraulic fracturing technology suitable for lithology and structure.To understand the fracturing feasibility in offshore low-permeability reservoirs,rock mechanics parameters,comprehensive brittleness index,and three-dimensional in-situ stress parameters were calculated according to the complex structural,physical,and lithological characteristics of the horizontal well 3H formation,and the volumetric fracturing feasibility was evaluated in the horizontal section of well 3H.The results show that:l)The Young's modules,the Poisson's ratios,the compressive strength,and the internal friction angles of formation from the 4th Member of Eocene Shahejie Formation(Es4)and the Mesozoic are between 31.8 GPa and 35.66 GPa,0.20 and 0.23,26.8 MPa and 30.3 MPa,42.7° and 44.8°,respectively.2)The comprehensive brittleness index of the horizontal well 3H is higher than 40％,and the horizontal principal stress differences are smaller than 3.3 MPa～3.65 MPa,which has geological and engineering conditions for forming complex fracture networks.These results are significant to the effective producing reserves in offshore low-permeability sandstone reservoirs.
万方数据
维普
