Currently, as GT Engineer, I’ve been assigned for OCTG Implementation & Continuous Improvement Analyst for Oil & Gas Well Exploration. OCTG (Oil Country Tubular Goods) is a group of different families of steel pipes, that used on inside the engineered structures of Oil & Gas Well.
OCTG is designed based on API/ISO Specification or equivalent standard, that involves the definition of all casing and tubing specifications (lengths, diameters, wall thicknesses, steel grades, connection types, etc.) that meet all technical requirements (pressures, temperatures,corrosion resistance, etc.) in the most economically possible way (optimal technical / economical solution), with the final goal of achieving a given production rate of Oil & Gas.
OCTG comprises :
Casing is the main structural compound of an oil or gas well. The “big” diameter pipes serving as structural retainer for the walls of the well that prevents the whole Well to collapse (Support Wellhead equipment), prevent movements of fluids or gases from one formation to another, isolate the producing horizons and keep out undesired fluids, etc.
Tubing is a relatively small-diameter tube that runs into the production casing to serve as a conduit for the passage of oil or gas from the reservoir to the surface. Ends are threaded for special integral-type joints or fitted with couplings and may or may not be upset externally. This type of pipe is placed inside the well and used to produce or to inject fluids (the ones through which the fluids runs).
It is a pipe which transmits power by a rotating movement from the ground level to a rotary drilling tool placed at the end of the drill string. pipe used to make the well bore by transmitting power from the surface to a rotary drilling tool.
“Connections” is a mechanical assembly consisting of either two pins and a coupling in a threaded and coupled connections, or one pin and one box in an integral design. This is an area where much effort is focused in order to minimize the risk, improve the safety factor and put at the minimum the probability of failure of the string elements. Almost all the OCTG material are joined by threaded connections.
Well, I know that I need to learn a lot for now. My life isn’t a race, and to “master” something worthwhile does takes time. Because, even the great artist was first an amateur, right..??