Classification and Qualities about Oil Casing

Spiral Welded Steel Pipe is a crucial equipment utilized in oil drilling, the main tools also contains drill pipe, tube and then casing, drill collar not to mention steel pipe for little diameter drilling. Petroleum casing pipe to geological drilling with metal after hot rolling or chilly drawn steel created, with "geological" (DZ), steel grade regularly used with DZ40, DZ55, DZ753.Classification coupled with properties associated with oil casing as follows.

The casing may be the assist relating to Astm Spiral Welded Steel Pipe coupled with oil gas properly bore pipe. We typically use several levels connected with casing as per the drilling depth plus distinct geological problems. Casing nicely right after the cementing, it really is various with all the tubing together with drill pipe, can't be utilised repeatedly, which belongs to the disposable consumables. Consequently, the usage for oil effectively pipe casing accounted for over 70% relating to the overall oil. The casing might be divided into: catheter, floor casing, casing and then casing in the well in line with the use.

1. The information sleeve: largely utilized for drilling in marine, desert, to different the water and then sand, ensure drilling efficiently, the main specifications regarding this layer related with sleeve ??¡ì? for: 762mm (30in) ?¡§¡é twenty five.4mm, 762mm ?¡§¡é 19.06mm (30in).

2. The surface area casing: largely employed for the first time the drilling, drilling in the bedrock area gentle strata, in an effort to seal the development will not collapse, a surface area casing cementing. The leading specs concerning area casing: 508mm (20in), 406.4mm (16in), 339.73mm (13-3/8in), 273.05mm (10-3/4in), 244.48mm (9-5/9in) etc.. The tube is dependent around the gentle strata depth, more often than not 80~1500m. The bearing external strain together with inner force is not massive, the final use associated with K55 steel or N80 steel grade.

three. The technological innovation related with casing

Complex casing used in drilling method about intricate formation, reservoir, reservoir, when layer, layer, leakage layer, salt plus gypsum layers these kinds of sophisticated elements collapsed, which all require complex casing cementing, or else drilling can't be used. Some wells deep plus complicated, plus the depth related with quite a few kilometers, the deep need technological casing a few levels, not to mention the mechanical properties and also sealing overall performance demands are fairly substantial, the quality connected with Api 5l Seamless Steel Pipe utilised can also be higher, with all the exception concerning J55 Oil casing pipe, much more is the use related with N80 together with P110 metal grade, some deep also uses Q125 or increased non API 5l Oil Casing Tube grade metal this sort of as V150. The leading complex requirements about casing are: 339.73mm (13-3/8in), 273.05mm (10-3/4in), 244.48mm (9-5/8in), 219.08mm (8-5/8in) 193.68mm (7- 5/8in), 177.8mm (7in) and so forth..

four. The casing

 168.28mm(6-5/8in)??¨¦139.7mm(5-1/2in)??¨¦127mm(5in)??¨¦114.3mm(4-1/2in)|¨¬¡§¡§??¨º

When drilling to the target layer (oil, gasoline layer), together with the casing connected with oil and also gasoline reservoirs about upper strata to bare all shut, casing internal layer. The mechanical coupled with sealing performance requirements is the highest, the metal quality K55, N80, P110, Q125, V150 and so forth.. The leading requirements connected with the casing are: 177.8mm (7in), 168.28mm (6-5/8in), 139.7mm (5-1/2in), 127mm (5in), 114.3mm (4-1/2in) and so on..