关键词: 油田, 控制水泥面的工具, 套管损坏

Abstract: Since Daqing Oilfield entered into high water cut period, casing failure has always been a prominent problem. Several hundred casing failure wells per year directly affected the efficiency of oilfield development. It has become the common focus of development and drilling that how to protect casing at early stage to prevent casing failure effectively. Slurry return height controller is an important technology to prevent casing failure. It is designed for casing failure of cementing oil shale datum bed of Nen'er bottom in non-cementing interval. This kind of tool can be opened and closed by pressure variation to circulate out unnecessary cement slurry. It can prevent missing cement of oil reservoir, and replace cement slurry with mud in annular space of easily damaged interval, to protect casing. After being applied in wellsite, it has been generally welcomed and accepted by oil production plants due to its economic and practical use. Up to now, it has been used more than 10,000 wells.

Key words: oilfield, slurry return height controller, casing failure