A METHOD FOR REMOVING PARAFFIN-HYDRATE AND/OR ASPHALTENE-RESIN-PARAFFIN DEPOSITS

摘要

The invention is related to oil-and-gas industry and can be used for removing paraffin-hydrate and/or asphaltene-resin-paraffin deposits in wells and in bottomhole formation zones (BHZ) during oil production and during cleaning of oil pipelines in oil-and-gas producing fields. The technical result is higher efficiency of removing paraffin-hydrate and/or asphaltene-resin-paraffin deposits and higher well flow rate. Said result is attained by provision of a method of removing paraffin-hydrate and/or asphaltene-resin-paraffin deposits by thermochemical impact on the well or on the bottomhole formation zone by way of interaction between water and a composition delivered into the well through a perforated lubricator or in a container in the form of a cylinder perforated over the element and made of aluminium and/or calcium, and/or iron, wherein the composition includes composites containing aluminium, calcium, and/or magnesium, and/or iron, and/or silicone, and alkaline metals with the following proportion of the components, % by mass: aluminium - 1.5-15.0; calcium - 1.0-60.0; and/or magnesium - 1.0-25.0; and/or iron - 1.0-10.0; and/or silicon - 1.0-5.0; alkaline metals - the balance, and additionally fed to the impact zone is 12-24% hydrochloric acid solution in an amount not exceeding 4-fold volume of the well bottom zone, with subsequent squeezing of reaction products with oil or water into the formation to a depth of at least 50 cm from the outer surface of the casing string. The container is made of producing tubing with clear area of perforation not lower than 15% of the container outer surface area.