Casing is used to support the walls in oil and gas wells to ensure proper operation throughout the well after the drilling process is completed. Each well is cased with multiple layers of casing depending on the drilling depth and geology. After casing is lowered, cement cementing is performed. Unlike tubing and drill pipe, it is not reusable and is a disposable material. Therefore, the consumption of casing accounts for more than 70% of all oil well tubing.

The tubing is cemented in place during construction to stabilize the wellbore. The casing is the main structural component of the wellbore and has several important functions.
Prevent formation walls from collapsing into the wellbore
Separate different formations to prevent flow or cross-flow of formation fluids
Maintaining control of formation fluids and pressures while drilling
Control equipment and production equipment downhole, such as drilling blowout preventers or production packers

Oil-specific tubing is mainly used for drilling oil and gas wells and transporting oil and gas. It includes petroleum drill pipe, petroleum casing and petroleum tubing. Oil drill pipe is mainly used to connect drill collar and drill bit and transmit drilling power. Oil casing is mainly used to support the well wall during drilling and after completion to ensure the normal operation of the whole well during drilling and after completion. Oil tubing mainly transports oil and gas from the bottom of the well to the surface.

HW Casing 3.0m

It is the lifeline to keep the well running. Due to different geological conditions and complex downhole conditions, the joint action of tensile, compressive, bending and torsional stresses on the tubing body places high demands on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a decrease in production or even the scrapping of the whole well.

According to the strength of the steel itself, casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. The steel grades used are different for different well conditions and depths. The casing itself also requires corrosion resistance in corrosive environments. In places with complex geological conditions, the casing is also required to have anti-crushing properties.

Now, the international oil industry is constantly developing and improving, and new skills for casing are being implemented. Trapezoidal thread technology allows drilling and casing to be drilled out during drilling operations. It reduces the cost of use while also significantly shortening the production cycle of well construction, simplifying the production structure of all drilling rigs, reducing the occurrence of accidents and greatly reducing costs.

Using drill rods as casing is worn out very quickly, so casing pipes are introduced as an alternative option. Our company recommended W series casing, which are re-usable, effective and economical.Casings are made of high quality tubing, and they are connected tightly using pin and box thread. W series casings also have matched casing drive shoes. Please send us a message if you need to buy them, our AW BW NW HW and PW are available for a selection.