油服工程板块8月27日跌2.81%，通源石油领跌，主力资金净流出1.21亿元

Core Insights - The oil service engineering sector experienced a decline of 2.81% on August 27, with Tongyuan Petroleum leading the drop [1] - The Shanghai Composite Index closed at 3800.35, down 1.76%, while the Shenzhen Component Index closed at 12295.07, down 1.43% [1] Sector Performance - Key stocks in the oil service engineering sector showed significant declines, with Tongyuan Petroleum down 5.42% to a closing price of 5.23 [1] - Other notable declines included Renji Co. down 4.16% to 6.91, and Beiken Energy also down 4.16% to 10.38 [1] Capital Flow - The oil service engineering sector saw a net outflow of 121 million yuan from major funds, while retail investors contributed a net inflow of 142 million yuan [1] - Specific stock capital flows indicated that Haiyou Development had a net inflow of 66.20 million yuan from major funds, while Haiyou Engineering saw a net inflow of 24.59 million yuan [2]