针对渤海海域重质稠油油田产量低的特点，为提高单井产能和最终采收率，以SZ36-1 油田边部稠油区为试验区，在现有反九点面积注水井网的基础上，选择分布稳定、油层厚度相对较厚的单砂层，并部署5 口水平分支井与常规定向井联合开发，取得了较好的开发效果。结果表明：水平分支井单井产能可达90～150 m3/d，是常规定向井产能的3～4 倍，可提高油田的采油速度；通过数值模拟，预计该区块可提高4% 左右的采收率。

The heavy oil fields in the Bohai Sea are characterized by low productivity. The heavy oil area of SZ36- 1 Oilfield is chosen for a pilot area which aims at improving both well productivity and ultimate recovery efficiency. Based on the existing inverted nine-spot pattern, five multilateral wells are located in the stably distributed sands with relatively thicker pay zones where put into production along with those existing directional well. It has been proven to be successful with the productivity of a multilateral well as high as 90 to 150 m3/d, which is 3 to 4 times than that of a directional well. Reservoir numerical simulation result shows that the increment of the ultimate recovery efficiency in pilot area could reach as much as 4%. The successful drilling and developing ofmultilateral wells breaks a new path to efficiently develop heavy oil fields.