Experimental Exploration on Reliability of Downhole Cementing Tool Attachment for Shallow Horizontal Wells in Yanchang Coalbed Methane East
The coal seam in the east area of Yanchang Gas field is buried in shallow depth,with low pressure and easy to leak layer.Coalbed methane wells in this area are prone to formation fracture and cement mud leakage during ce-menting process,and the reliability of downhole cementing tools and accessories directly affects the cementing quality.In this paper,from the analysis of cementing technical difficulties,for the high reliability of the spring ball type float hoop float shoes,cementing pressure shut-in valve and other equipment completed simulation analysis and performance tests;The high reliability of the tool is improved by the collision-pressure closing float hoop.The tool accessories were designed to form a cementing pipe string structure,and two horizontal wells were used in the field.The results show that the preferred cementing tool accessories can meet the technical requirements of shallow extended reach horizontal well cementing construction.
coal bed gasshallow large displacementcementing tool accessoriesreliabilitysimulation
万方数据
维普
