The technology of cleaning tubing from hydrate-resin-paraffin deposits

Abstract

During the operation of oil and gas wells there is a constant decline in production. The reason may be various factors, such as the reduction of the internal space of the tubing due to the deposition of hydrate-paraffins, asphaltenes, resins and mineral salts. To prevent and clean these deposits, various control methods are used: the use of special coatings on the inner surface of the pipes, the introduction into the pumped stream of various chemical
reagents, sonication, magnetic treatment, mechanical methods, etc. However, some of them are considered inefficient, economically unprofitable or quickly fail.That is why an improved design of a device for cleaning the inner surface of tubings of oil and gas wells was proposed. The device refers to the equipment of the oil and gas industry, namely as a mechanism for restoring the internal space of well pumps. Calculations for the design of cleaning
devices for different diameters of tubing are given. Kinetic calculations of the movement of the cleaning mill in tubing pipes under the action of hydraulic forces were performed. Based on the obtained equations, in the process of design development, the dimensions and shapes of the working (main) and additional (reverse) cutters were calculated, the masses and strength characteristics of structural elements (pins, traverse, cable, bolted joints, etc.) were selected. Provided the necessary rigidity and reliability of the entire cleaning device. Thus, the proposed design developments in combination with the previously known will allow to obtain a new positive effect, which is to improve the quality of cleaning of tubing. Industrial tests of the developed design on objects showed significant advantages in comparison with domestic and foreign analogs.