直井与水平井组合吞吐转汽驱操作参数优选

S 断块为一中低孔、中低渗稠油油藏。 利用数值模拟方法系统优选了该断块稠油油藏直井与水平井组合吞吐转入蒸汽驱的操作参数。 结果表明：直井射孔位置与水平井垂向距离 15 m、水平井射孔位置与油层底界垂向距离 7.0 m，直井吞吐 8 周期、水平井吞吐 6 周期，地层压力降至 5 MPa 左右，注汽速度 84 m3/d，井底蒸汽干度 >40%，采注比 1.2，为吞吐转汽驱的最佳操作参数。 上述操作参数能使 S 断块吞吐转汽驱有效运作，提高原油采收率，也为同类型油藏直井与水平井组合吞吐转汽驱的操作参数优选提供了可靠的理论依据，具有一定的借鉴意义。

Operation parameters optimization of steam flooding with the combination of vertical and horizontal wells

The S block is a low-middle porosity and low-middle permeability reservoir. This paper studied the operation parameters for steam flooding with the combination of vertical and horizontal wells by numerical simulation. The result shows that the optimum operation parameters are as following: the vertical distance is 15 m between the vertical well and horizontal well, and the vertical distance is 7 m between the horizontal well and reservoir bottom; after eight cycles of vertical well and six cycles of horizontal well, formation pressure dropped down to 5 MPa; the best steam injection rate is 84 m3/d, downhole steam dryness is greater than 40%, and production-injection ratio is 1.2. These optimum operation parameters make the steam flooding effective in S block, enhance the oil recovery factor, also provide reliable theoretical basis of operation parameters for steam flooding with the combination of vertical and horizontal wells in other similar reservoirs, and have very good reference significance.