At the moment, several types of pipes are produced in the industry at once. First of all, two of them need to be distinguished: core and casing. The casing pipe is used to strengthen gas and oil wells during their drilling and development.
Casing pipes for a well can consist of completely different materials: cast iron, steel, plastic, asbestos cement, etc.
It is quite logical that recently plastic has become the most widespread, because casing pipes for wells made of this material have a fairly long service life.
It is worth noting the high technical characteristics of the plastic.
Naturally, corrosion resistance, which metal cannot have, immediately comes to mind. If water flows through metal pipes, this will negatively affect its quality. When using steel pipes, the water often has an unpleasant metallic taste.
Besides this, the plastic casing pipe perfectly sinks in water and is quite resistant to pollutionand to stone sediment. It is also able to withstand fairly large loads (up to 5 tons), is durable and strong. It should be noted separately the high-quality inner surface of the pipe, which allows to reduce its resistance to flow. In addition to all its advantages, it has the ability to easily install pipelines of smaller diameters.
It is worth considering the fact that the casing pipe must be manufactured in accordance with all established standards. In this case, even minor deviations are unacceptable. Despite the variation in wall thickness and ovality, the parameters of the pipe should in no case go beyond the established parameters of the diameter and wall thickness. The same applies to its non-straightness. A maximum non-straightness of one millimeter is allowed per meter of pipe. Moreover, only if we are talking about pipes of large diameter (over 89 millimeters), made with the usual precision.
When manufacturing pipes with increased accuracy, even such slight discrepancies in parameters are unacceptable (maximum 0.5 millimeters per meter). If we talk about pipes of small diameter (33.5-89 mm), then in the first case deviations of 0.7 mm are allowed, in the second - 0.3 mm. Such a pipe is lowered into the well in order to prevent shedding of loose rocks earth. In any situation, the casing pipe should fit as tightly as possible to the walls of the well itself. Therefore, such a variety of options for the diameter of the finished product.
Usually betweenconcrete is poured with a casing pipe and a well wall. This is necessary for a more rigid fixation. And then pipes of a smaller diameter are used. They are needed for further drilling or direct use of the well. It is worth noting once again that the pipes must always have a certain diameter and the same certain size. Otherwise, the drilling process may become much more complicated, which is highly undesirable.
