Generally the irreducible water saturation of low permeability gas reservoir is quite high which leads to the permeability stress sensibility and threshold pressure gradient. Under the assumption that permeability var...Generally the irreducible water saturation of low permeability gas reservoir is quite high which leads to the permeability stress sensibility and threshold pressure gradient. Under the assumption that permeability varies with experimental law of the pseudo pressure drop, according to concepts of perturbable ellipses and equivalent developing regulations, the calculation method of stable production of hydraulically fractured gas well in low permeability reservoirs is investigated with threshold pressure. And productivity curve is drawn and analyzed. The result shows that, permeability modulus and threshold pressure have effect on production of fractured gas well. The higher the permeability modulus and the threshold pressure, the lower the production is. Therefore, the impact of stress sensitive and threshold pressure must he considered when analyzing the productivity of vertical fracture well in low permeability gas reservoir.展开更多
运用数值模拟方法评估降黏剂驱在高青油藏的应用效果,根据室内降黏剂评价试验结果,建立降黏剂驱数值模拟模型,并依据吨剂增油量对降黏剂注入参数进行优化。结果表明:当以降黏剂质量浓度为3000 mg/L、注入速度为200 m 3/d,共计注入降黏剂...运用数值模拟方法评估降黏剂驱在高青油藏的应用效果,根据室内降黏剂评价试验结果,建立降黏剂驱数值模拟模型,并依据吨剂增油量对降黏剂注入参数进行优化。结果表明:当以降黏剂质量浓度为3000 mg/L、注入速度为200 m 3/d,共计注入降黏剂0.2 V_(P)(孔隙体积)时,吨剂增油量最高;与水驱相比,提高原油产量4.4×10^(4)t,提高采收率3.66%。展开更多
Reservoir boundary shape has a great influence on the transient pressure response of oil wells located in arbitrarily shaped reservoirs. Conventional analytical methods can only be used to calculate transient pressure...Reservoir boundary shape has a great influence on the transient pressure response of oil wells located in arbitrarily shaped reservoirs. Conventional analytical methods can only be used to calculate transient pressure response in regularly shaped reservoirs. Under the assumption that permeability varies exponentially with pressure drop, a mathematical model for well test interpretation of arbitrarily shaped deformable reservoirs was established. By using the regular perturbation method and the boundary element method, the model could be solved. The pressure behavior of wells with wellbore storage and skin effects was obtained by using the Duhamel principle. The type curves were plotted and analyzed by considering the effects of permeability modulus, arbitrary shape and impermeable region.展开更多
文摘Generally the irreducible water saturation of low permeability gas reservoir is quite high which leads to the permeability stress sensibility and threshold pressure gradient. Under the assumption that permeability varies with experimental law of the pseudo pressure drop, according to concepts of perturbable ellipses and equivalent developing regulations, the calculation method of stable production of hydraulically fractured gas well in low permeability reservoirs is investigated with threshold pressure. And productivity curve is drawn and analyzed. The result shows that, permeability modulus and threshold pressure have effect on production of fractured gas well. The higher the permeability modulus and the threshold pressure, the lower the production is. Therefore, the impact of stress sensitive and threshold pressure must he considered when analyzing the productivity of vertical fracture well in low permeability gas reservoir.
文摘运用数值模拟方法评估降黏剂驱在高青油藏的应用效果,根据室内降黏剂评价试验结果,建立降黏剂驱数值模拟模型,并依据吨剂增油量对降黏剂注入参数进行优化。结果表明:当以降黏剂质量浓度为3000 mg/L、注入速度为200 m 3/d,共计注入降黏剂0.2 V_(P)(孔隙体积)时,吨剂增油量最高;与水驱相比,提高原油产量4.4×10^(4)t,提高采收率3.66%。
文摘Reservoir boundary shape has a great influence on the transient pressure response of oil wells located in arbitrarily shaped reservoirs. Conventional analytical methods can only be used to calculate transient pressure response in regularly shaped reservoirs. Under the assumption that permeability varies exponentially with pressure drop, a mathematical model for well test interpretation of arbitrarily shaped deformable reservoirs was established. By using the regular perturbation method and the boundary element method, the model could be solved. The pressure behavior of wells with wellbore storage and skin effects was obtained by using the Duhamel principle. The type curves were plotted and analyzed by considering the effects of permeability modulus, arbitrary shape and impermeable region.
