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OCTG stands for Oil Country Tubular Goods, which mainly refers to tubular products related to oil and gas production (drilling activities). OCTG pipes are mostly manufactured according to API or related standard specifications. Also, these pipes are used as drilling pipes, steel seam pipes and marine pipes, fittings and accessories, which are used in the oil industry at home and abroad. According to the API standard, through the control of chemical properties And adopting different heat treatment, OCTG pipes are classified into more than ten grades of different materials.
There are three main types of OCTG pipe products available, which include the following pipes:
• DRILL PIPE
DRILL PIPE or drill pipes (drilling pipes) are a type of seamless pipes in which an element called the drill bit rotates and causes the drilling to move. This causes the drilling fluid to flow. It can be pumped through the bit and prepared from the Pashtian ring. One of the characteristics of these pipes is that they are subjected to axial stress, very high torque and high internal pressure. For this reason, these pipes are very important pipes. Drill pipes are usually used for durable steel pipe in drilling, and these pipes are available in API 5DP and API SPEC 7-1 standards.
CASING PIPE, also known as steel casing pipes, is used for excavation. These pipes are used for excavation in order to obtain oil and gas by creating holes in the ground. These pipes are similar to the pipes. Drilling is stress oriented. These pipes, which have a large diameter, are created in a large hole and are protected with cement. These pipes are exposed to axial stress due to the heavy weight of the pipe, the external pressure that is applied to the pipe by the stone around it, and the internal pressure that is applied to its body by the refining of liquids. These pipes have a heavy weight, which is an important part. They are from OCTG pipes.
TUBING is the pipe inside the furnace. This type of OCTG pipes is the simplest type of these pipes, which ultimately transfers oil from underground to above ground. These pipes are available in lengths of about 9 meters (30 feet) with threaded connections on each side that can be protected and covered with drill pipe guards during transport and storage. These guards and covers also It helps to protect against any corrosion that can happen during extraction, which can prevent problems in transferring oil from the bottom to the top.
These pipes must be able to withstand high pressure during the extraction process and sufficiently withstand loads and deformations related to production. Just like the veneer production, this pipe is produced in the same way but an additional distressing process is applied to make it thicker.
OCTG tube processes
The production processes of OCTG pipes include all the approximate dimensional ranges, which are explained below about the size of the pipes and their production process.
• For pipes with sizes between 21 and 178 mm OD, continuous mandrel rolling process and pressure bench process are used.
• Plug rolling process is used for pipes with sizes between 140 and 406 mm OD.
• For pipes between 250 and 660 mm OD, the process of cross drilling and roller patrolling is used.
These processes typically do not allow thermomechanical processing for strip and plate products used for welded pipe. Therefore, high strength seamless pipes should be produced by increasing the amount of alloy in combination with a suitable heat treatment.
Responding to the basic need of a completely martensitic substructure so that it needs good strength even in the wall thickness of large pipes.
Chromium and manganese are the main alloying elements of tubes used to produce good hardenability in normal high temperature steel. However, for the need of cracking resistance, sulfide (SSC) is used to limit them.
Mn metal can continuously separate during casting, forming large Mn inclusions that reduce resistance to hydrogen-induced cracking.
Higher levels of chromium can lead to the formation of chromium deposits with high morphology on the plate, which act as hydrogen scavengers and crack initiators. Alloys containing molybdenum can overcome the concentration of manganese and chromium alloys. Molybdenum is harder than manganese and chromium, so it can easily restore the effect of reducing these elements.
In recent years, the drilling of deep wells and reservoirs containing contaminants that cause corrosion attack have created a great demand for materials and elements with higher resistance to hydrogen and sulfide contamination.
High-temperature martensite is a structure that is resistant to sulfide at higher values than 0.75% molybdenum concentration, which provides an optimal combination of performance strength and sulfide resistance.
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