关键词: 筛管完井, 注水泥器, 自关闭, 完井时间, 固井质量

Abstract: When the existing cementing unit has finished pumping cement slurry, a plug needs dropping and pressure needs holding to close the circulation channel. This tends to create a poorly-sealed cement pumping channel and cause the slurry to flow back, which affects the cementing quality. In order to handle the problems mentioned above, the new type multifunctional cementing tool was developed to effectively solve the problem that circulating channel is hard to close after bumping the plug. The plug seat of the new product is made of a new material and is easy to drill without any ring space left, so that it can effectively reduce the risk from subsequent operations. The product is simple and reasonable in structure and convenient to operate, so it can reduce operation procedures and improve work efficiency. And the cementing pumping channel can be opened and closed safely and reliably. It has been used for 138 wells in Dagang, Jidong and other oilfields, shortening the average completion time by 6-12 hours.