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The Most Widely Used Method For Cementing Large-diameter Casing Both Domestically And Internationally Is The Insertion Type Inner String Cementing Method By Adopting This Method, Cement Can Be Saved, And The Mixing Of Cement Slurry And Drilling Fluid In The Casing Can Be Reduced, Thereby Achieving The Goal Of Improving The Quality Of Well Cementing.

The Casing Is Located On The Outermost Layer, Used To Seal Off The Soft And Prone To Collapse Layer In The Upper Part Of The Formation, Install The Wellhead, Control Blowouts, And Support The Technical Casing And Oil Reservoir Casing. Therefore, Watch Sets Often Require Straight Seam Submerged Arc Welded Pipes Or Seamless Pipes With Larger Diameters (400-1000mm Outer Diameter) And Lower Steel Grades (usually J55 Or K55), But Considering Procurement Costs, Straight Seam Submerged Arc Welded Pipes Are Basically The Main Ones.

The Subsea Casing Is A Casing That Runs From The Offshore Drilling Platform To The Shallow Seabed. Its Main Function Is To Isolate Seawater, Form A Drilling Fluid Circulation Channel, And Serve As A Supporting Structure For The Offshore Wellhead. The Strength And Safety Of The Subsea Conduit Are Crucial For The Safety Of Offshore Drilling Operations During The Drilling And Completion Process.