Study on Liner Cementing Technology of Horizontal Wells in Canxue Oil Field, the East China Sea

In order to develop gas reservoirs with the bottom water, CX-A10H applied liner cementing combined with directional perforation completion technology for the first time in Canxue oil-gas field. Excellent cementing quality of horizontal wells is the basic guarantee to achieve the long-term and efficient development. Firstly technical requirements and difficulties of the liner cementing were analyzed, including cementing slurry comprehensive performance, cementing tools and accessories, low displacement efficiency, difficulty in pressure control and gas channeling prevention. Then non-permeable and channeling-prevention cement slurry was developed, displacement efficiency improvement technique was optimized, pressure control and gas channeling prevention technique in different cementing stage was designed, which formed the key techniques. Supporting technologies were matching, such as rotary liner hanger, drilling mud performance adjustment, non-existent up plug, remedial plans aiming at back pressure valve failure and blank casing overlap section. Eventually liner cementing technique and technology suitable for Canxue oil field in the East China Sea was formed. Through the on-site application test of Well CX-A10H, the cementing quality was excellent, offering technical storage for the following similar cementing operations.