METHOD OF HEATING HYDROCHLORIC ACID SOLUTION FOR INJECTION INTO WELL AND FORMATION Russian patent published in 2024 - IPC E21B43/27 

FIELD: oil industry.

SUBSTANCE: invention relates to methods for intensification of oil production from carbonate reservoirs with low temperature by treatment of bottomhole formation zone with hydrochloric acid solution (HAS) with high temperature. Disclosed is a method of heating hydrochloric acid solution for pumping into a well and a formation, which consists in pumping hydrochloric acid solution (HAS) through a container filled with magnesium. At the same time at the wellhead there is a battery of several containers with magnesium, which have high-pressure ball valves at the ends and are connected in parallel to each other into one injection line between the pump unit and the well. HAS is pumped into the well through one container with the other containers closed. After the temperature of the hydrochloric acid solution drops below the allowable value, the container with the spent magnesium is closed on both sides and the next container is opened for pumping the acid; at this time, the used container is filled with magnesium. Pumping of hot hydrochloric acid solution is carried out in the required volume by means of successively reacting with the solution of hydrochloric acid containers with magnesium. At the same time the injection pipe string is composed of “ТЛТ” pipes – heat-insulated tubing.

EFFECT: improved filtration-capacitance characteristics of carbonate reservoir due to supply of hydrochloric acid solution with required temperature to the formation.

1 cl, 1 dwg