Currently, several types of pipes are produced in industry at once. First of all, two of them need to be distinguished: core and casing. 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 in recent years it has been plastic that has become most widely used, because casing pipes made of this material for wells have a rather long service life.
It is worth noting the high technical characteristics of plastic.
Naturally, corrosion resistance immediately comes to mind, which a metal cannot possess. If water flows through metal pipes , this will most negatively affect its quality. When using steel pipes, an unpleasant metallic aftertaste often appears in the water.
In addition, the casing pipe made of plastic drowns perfectly in water and is quite resistant to dirt and stone sediment. It is also able to withstand sufficiently large loads (up to 5 tons), is characterized by durability and strength. It is necessary to separately note the high-quality inner surface of the pipe, which reduces its resistance to flow. In addition to all its advantages, it has the ability to freely install smaller pipelines.
It is worth considering the fact that the casing pipe must be manufactured in accordance with all established standards. In this case, even slight deviations are unacceptable. Despite the difference and ovality, the parameters of the pipe should in no case go beyond the established parameters of the diameter and wall thickness. The same goes for its indirectness. A maximum straightness of one millimeter is allowed per meter pipe. Moreover, only if we are talking about pipes of large diameter (over 89 millimeters), made with ordinary accuracy.
In the manufacture of pipes with increased accuracy, even such minor differences 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 permissible, in the second - 0.3 mm.
Such a pipe is lowered into the well in order to prevent the shedding of loose 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.
As a rule, concrete is poured between the casing pipe and the borehole wall. This is necessary for more rigid fixation. And then pipes of smaller diameter are used. They are needed for further drilling or direct use of the well. It is worth noting again that pipes should always have a certain diameter and the same certain size. Otherwise, the drilling process can become much more complicated, which is extremely undesirable.