Spiral casing centralizer has the advantages of simple structure, safe and high intensity. It can be widely used in vertical,deviated and horizontal well in the construction work.Rigid spiral centralizer can improve the efficiency of well cementation through cement paste revolving when cement injection in the vertical well. Spring centralizer is...

In addition to all the features of single-stage casing head ，the double-stage casing head presents the following features: Through putting the testing plug into 9-5/8 "hanger before pressure test of the third section drilling, Can be fully detected quality of the second section drilling. The procedures and workforce of installing BOP can be...

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