Abstract: To solve the high cost and reservoir protection problems existed in workover operations in Bohai oilfield,a temporary plugging liquid system suitable for workover operation is optimized.The formula of temporary plugging fluid is as follows:production water,0.8% ZC-VIS tackifier,2.0% ZC-LS filtration loss reducer and 8% ZC-ZD temporary plugging agent.Performance evaluation shows that the temporary plugging fluid can be stabilized for 12 days at 80℃,and the pressure-bearing capacity of the system after temporary plugging fluid exceeds 9 MPa.Core plugging performance show that the permeability recovery value of the core after direct returning is about 85%,and the core permeability recovery rate after slicing is above 90%.When the temporary plugging liquid is applied for 2 times of wells workover in Bohai oilfield,both are successful once time.The production capacity after workover exceeds 95% that before workover,and the field application exhibits good effect in reservoir protection.The temporary plugging liquid has remarkable economic benefit with a cost reducing 20% or more than current temporary plugging liquid.
李翔, 邢希金, 曹砚锋, 郭宏峰, 刘磊, 石先亚. 适于渤海油田修井作业的暂堵液筛选与应用[J]. 现代化工, 2019, 39(S1): 142-145.
LI Xiang, XING Xi-jin, CAO Yan-feng, GUO Hong-feng, LIU Lei, SHI Xian-ya. Optimization and application of temporary plugging fluid for workover in Bohai oilfield. Modern Chemical Industry, 2019, 39(S1): 142-145.
