BZ26-6 Oilfield is a kind of deep metamorphic rock buried-hill volatile oilfield in Bohai Sea, China. Its early development plan is restricted due to the simultaneous production of oil and gas in large sections of res...BZ26-6 Oilfield is a kind of deep metamorphic rock buried-hill volatile oilfield in Bohai Sea, China. Its early development plan is restricted due to the simultaneous production of oil and gas in large sections of reservoirs, unclear understanding of formation fluid properties and uncertainty of gas-oil interface. Through theoretical research on phase recovery and experimental analysis of crude oil phase characteristics in the original formation, characteristic parameters of the equilibrium condensate gas fluid are restored and calculated. Through the superimposed phase diagram of volatile oil and condensate gas, BZ26-6 Oilfield is determined to be a volatile oil reservoir with a condensate gas cap, with formation pressure and saturation pressure of 36.1 MPa, respectively. Based on the research results of oil-gas phase behavior characteristics, the thermodynamic equations and equation of state are jointly used to solve the problem, and the content change curves of each component at different depths are drawn. Combined with the sensitivity analysis of numerical simulation, the gas-oil interface is determined to be -3726 m above sea level. The fluid phase analysis software, Fluidmodeler, is used to simulate volatile oil degassing and condensate gas separation experiments. In combination with oil and gas production data obtained through the production test, the specific oil recovery index and the specific gas recovery index are determined to be 0.408 m<sup>3</sup>/(MPa·d·m) and 1195 m<sup>3</sup>/(MPa·d·m), respectively. And the reasonable production capacity prediction is conducted on the early development of BZ26-6 Oilfield. The research results can provide a theoretical basis for the efficient development of similar complex oil and gas reservoirs.展开更多
Simulation study was applied in the development planning of East Unity oil field, Sudan. A grid consisting of 2 000 cells was constructed. A major challenge of the study was to evolve a full field development and futu...Simulation study was applied in the development planning of East Unity oil field, Sudan. A grid consisting of 2 000 cells was constructed. A major challenge of the study was to evolve a full field development and future reservoir management strategy that would ensure maximum recovery of oil based on well Un51. Simulation shows that Un51 as injection well in AradiebaC would yield better oil recovery than to be production well.展开更多
为验证绒囊流体在含高矿化度地层水地层中稳油控水效用,在温度120℃、围压15 MPa、回压1.5 MPa条件下,采用恒流速法测定绒囊流体封堵前后,含不同矿化度盐水和煤油的人造砂岩柱塞稳定流动渗透率和注入压力变化。实验结果表明,0.1 m L/mi...为验证绒囊流体在含高矿化度地层水地层中稳油控水效用,在温度120℃、围压15 MPa、回压1.5 MPa条件下,采用恒流速法测定绒囊流体封堵前后,含不同矿化度盐水和煤油的人造砂岩柱塞稳定流动渗透率和注入压力变化。实验结果表明,0.1 m L/min恒定流速下,绒囊流体封堵前后,含Fe2＋＋Ca2＋＋Mg2＋矿化度分别为1×104 mg/L、10×104 mg/L、20×104 mg/L盐水岩心驱替压力由0.46~0.63 MPa升至1.39~2.23 MPa,封堵能力提高205.83%~262.64%;渗透率140.82~193.30 m D降至66.96~109.85 m D,损失率43.15%~52.53%。以煤油模拟地层原油,相同条件下测定封堵前后效果,驱替压力0.48~0.52 MPa升至0.51~0.55 MPa,增幅5.83%~8.08%;渗透率232.05~272.52 m D降至211.09~249.25 m D,损失率2.26%~4.51%。在地层水矿化度8×104 mg/L、4×104 mg/L的Y井和Z井实施绒囊流体稳油控水,通过提高泵次、深抽等工艺,油井产水量分别降低46.38%、15.99%,产油量提高6 200%、180%。研究和应用表明,绒囊流体抗高矿化度堵水体系能够实现稳油控水。展开更多
文摘BZ26-6 Oilfield is a kind of deep metamorphic rock buried-hill volatile oilfield in Bohai Sea, China. Its early development plan is restricted due to the simultaneous production of oil and gas in large sections of reservoirs, unclear understanding of formation fluid properties and uncertainty of gas-oil interface. Through theoretical research on phase recovery and experimental analysis of crude oil phase characteristics in the original formation, characteristic parameters of the equilibrium condensate gas fluid are restored and calculated. Through the superimposed phase diagram of volatile oil and condensate gas, BZ26-6 Oilfield is determined to be a volatile oil reservoir with a condensate gas cap, with formation pressure and saturation pressure of 36.1 MPa, respectively. Based on the research results of oil-gas phase behavior characteristics, the thermodynamic equations and equation of state are jointly used to solve the problem, and the content change curves of each component at different depths are drawn. Combined with the sensitivity analysis of numerical simulation, the gas-oil interface is determined to be -3726 m above sea level. The fluid phase analysis software, Fluidmodeler, is used to simulate volatile oil degassing and condensate gas separation experiments. In combination with oil and gas production data obtained through the production test, the specific oil recovery index and the specific gas recovery index are determined to be 0.408 m<sup>3</sup>/(MPa·d·m) and 1195 m<sup>3</sup>/(MPa·d·m), respectively. And the reasonable production capacity prediction is conducted on the early development of BZ26-6 Oilfield. The research results can provide a theoretical basis for the efficient development of similar complex oil and gas reservoirs.
文摘Simulation study was applied in the development planning of East Unity oil field, Sudan. A grid consisting of 2 000 cells was constructed. A major challenge of the study was to evolve a full field development and future reservoir management strategy that would ensure maximum recovery of oil based on well Un51. Simulation shows that Un51 as injection well in AradiebaC would yield better oil recovery than to be production well.
文摘为验证绒囊流体在含高矿化度地层水地层中稳油控水效用,在温度120℃、围压15 MPa、回压1.5 MPa条件下,采用恒流速法测定绒囊流体封堵前后,含不同矿化度盐水和煤油的人造砂岩柱塞稳定流动渗透率和注入压力变化。实验结果表明,0.1 m L/min恒定流速下,绒囊流体封堵前后,含Fe2＋＋Ca2＋＋Mg2＋矿化度分别为1×104 mg/L、10×104 mg/L、20×104 mg/L盐水岩心驱替压力由0.46~0.63 MPa升至1.39~2.23 MPa,封堵能力提高205.83%~262.64%;渗透率140.82~193.30 m D降至66.96~109.85 m D,损失率43.15%~52.53%。以煤油模拟地层原油,相同条件下测定封堵前后效果,驱替压力0.48~0.52 MPa升至0.51~0.55 MPa,增幅5.83%~8.08%;渗透率232.05~272.52 m D降至211.09~249.25 m D,损失率2.26%~4.51%。在地层水矿化度8×104 mg/L、4×104 mg/L的Y井和Z井实施绒囊流体稳油控水,通过提高泵次、深抽等工艺,油井产水量分别降低46.38%、15.99%,产油量提高6 200%、180%。研究和应用表明,绒囊流体抗高矿化度堵水体系能够实现稳油控水。
