The API casing is generally used for the borehole wall support in the drilling as well as after the completion of a well, so as to make sure the smooth running of the drilling process and also the normal procedure of the whole oil well after well completion. As a result of the advancement in recent years, making use of the product is much more substantial. It is generally utilized in oil, gas, coal bed methane, water system, thermal electrical power generation, hydropower penstock, thermal electrical power generation, dredging design, as well as other sectors.
This product generally makes use of smooth steel pipeline as the raw product. Some large diameter and special wall thickness items make use of straight seam pipeline as the pipeline body. The body should be processed with screw strings at both ends. One end is linked to the combining, while the other end is equipped with the string protector. Thread as well as coupling link are used between the casings. In addition, the pipe body of various steel qualities ought to correspond to different couplings.
⑴ Production criterion: API Spec 5CT
★ Steel quality: J55, K55, L80, N80, P110.
★ External size: 4 1/2", 5", 5 1/2", 6 5/8", 7", 7 5/8", 9 5/8", 10 3/4", 13 3/8", 16", 18 5/8", 20".
★ Wall density: 5.21-16.13mm.
★ Thread kind: SC( Short round string), LC( Long round thread), BC( Buttress string).
★ Length: R1( 4.88-7.62 m), R2( 7.62-10.36 m), R3( 10.36-14.63 m).
⑵ Casing strings.
According to the function of well cementation and also the feature of casing, the item down right into a well can be mostly divided into the surface area, intermediate, and also manufacturing types.
★ Surface area casing: The setting depth varies from 10s of meters to hundreds of meters. It depends upon different developments.
★ Intermediate casing: It is used for securing the facility development, so about make certain the smooth running of boring. It can separate huge sector lost-circulation area, stressful water layer, significant collapse strata, in addition to non-target layer of oil or gas, and so on.
★ Production casing: It is used to divide the gas, water, or oil layer of different stress from various other strata, so regarding create the oil as well as gas stations. This guarantees the long-lasting production as well as satisfies the extraction and also stimulation needs.
⑶ The API tubing is defined as a pipe that drops right into the wells for the production or injection of fluids. In oil expedition, it drops hole to remove underground oil or gas, depending on threaded link. It normally travels through the oil casing, which plays a role of protection and also seclusion.
★ Specification: API SPEC 5CT.
★ Steel quality: J55, K55, N80, L80, P110, etc.
★ Outdoors diameter: 2-3/8IN, 2-7/8IN, 3-1/2IN, 4IN, 4-1/2IN.
★ Wall thickness: Non-upset tubing (NU), External distressed tubing(EU), Integral joint tubing(IJ).
★ Length: R1(6.10-7.32 m), R2(8.53-9.75 m), R3(11.58-12.80m).
★ String type: Round thread(8RD, 10RD).