LABORATORY TEST BENCH FOR REPRODUCING OPERATING CONDITIONS INSIDE A TUBING STRING SUBMERGED IN AN OIL WELL DURING TESTING VARIOUS METHODS TO COUNTER CORROSION AND SEDIMENTATION Russian patent published in 2023 - IPC G01N13/00 G01N17/00 

FIELD: laboratory test equipment.

SUBSTANCE: invention relates to laboratory test equipment capable of simulating internal conditions inside a section of a tubing string (tubing string) through which hydrocarbons are lifted in an oil well. The laboratory test bench for reproducing the operating conditions inside a tubing string (tubing string) submerged in an oil well when testing various methods of combating corrosion and sedimentation, basically contains a closed hydraulic circuit for heating and circulating a test medium identical to oil-water mixtures produced from oil reservoirs, which includes a test section consisting of four removable vertical parallel coaxial structures of the "pipe in pipe" type, in which the inner pipe is a test sample in the form of a tubing segment, washed from the inside by a circulating medium, and the outer pipe is a cooling jacket and forms an annular gap through which the coolant circulates, cooling the inner walls of the tubing segments and provoking the fallout of asphalt, resin and paraffin deposits (ARPD) from the test medium with the ability to control the temperature conditions of precipitation in real time due to the presence of a through hole coaxially located in each cooling jacket at assembling the sample and the jacket with a blind hole drilled in the sample and the temperature sensors mounted inside the resulting seat. Removable coaxial structures are mutually positioned relative to each other in the test section so that the flows of the test medium flowing through each segment of the tubing cover the same distance from the common entry point into the test section to the common exit point from it, ensuring the uniformity of hydrodynamic conditions in each test branch pipe, in addition, an electromagnetic distribution manifold is included in the system for supplying coolant from the tank with the coolant and the cryostat to the cooling jackets of the test sections, supplying refrigerant to the cooling jacket of each individual branch pipe to ensure equal temperature conditions for cooling the walls, regardless of how the ARPD is deposited in each branch pipe; the collector is controlled remotely and automatically by means of feedback from the signals from the temperature sensors in the wall of each sample, which arrive at the stand control terminal and from there control each solenoid valve of the collector via a wired connection.

EFFECT: increasing the convergence and reproducibility of bench test results for testing existing models for predicting the precipitation of paraffin deposits on different types of surface and the possibility of comparing the results of bench tests with the results of experimental testing and indirect methods for assessing the resistance of surfaces to paraffin deposits.

1 cl, 2 dwg