Oil casing is a kind of large diameter pipe, a fixed shaft or hole of oil and gas oil. Casing is inserted into the hole, with cement, in order to prevent the borehole and separated strata borehole collapse, and ensure the drilling mud circulation flow, so that the drilling. In drilling process using different types of casing: drilling, surface oil casing - protection to avoid contamination by shallow water layer and the shallow gas, to support the wellhead equipment and keep the other layer weight of the casing. Technology of oil casing - separation of different levels of pressure, so that the drilling fluid lines normal circulation and protect the production casing. - in order to reverse blowout device installation, drilling blowout preventer and the tail pipe. Reservoir oil casing, oil and natural gas are derived from the storage layer under the surface of the earth.

OD     WEIGHT       WT           ID            DN    COLLARGRADELENGTH

177.8 (7)

25.52917.00) 29.79(20.00) 34.26(23.00) 38.73(26.00) 43.20(29.00) 47.66(32.00) 52.13(35.00) 56.60(38.00)

5.87(0.231) 6.91(0.272) 8.05(0.317) 9.19(0.362) 10.36(0.408) 11.51(0.453) 12.65(0.498) 13.72(0.540)

166.1(6.538) 164.2(6.456) 161.7(6.366) 159.4(6.276) 157.1(6.180) 154.8(6.090) 152.5(6.004) 150.4(5.430)

162.9(6.413) 160.8(6.331) 158.5(6.204) 156.2(6.151) 153.9(6.059) 151.6(5.969) 149.3(5.879) 147.2(5.795)

194.5 (7.656)

j55 n80 p110

8m-12m (2602-39.4)