METHOD FOR ASSESSING THE IMPACT OF TECHNOLOGICAL LIQUIDS ON ROCK Russian patent published in 2023 - IPC E21B49/00 G01N15/08 G01N33/24 

FIELD: oil production.

SUBSTANCE: method for evaluating the impact of a process fluid on a rock includes a geological study of core samples 30x30 mm in size, examination of samples on an X-ray tomograph to obtain 2D sections and 3D images, determining the number of pores and their opening range. Next, the X-ray tomography data is processed before and after exposure to the process fluid on the rock samples, scanning the surface of the core samples - the places of thickening of cracks, caverns and / or pores using a scanning electron microscope, processing the electron microscopy data by comparing the images of the “reference point” areas. An X-ray fluorescent analysis of rock core samples is carried out, then residual water saturation is created in the core samples. Next, the porosity is determined and the rock core samples are placed in the core holder of the filtration unit, the lateral, end crimping of the core with a rubber cuff and the formation temperature are created. The sample is exposed to the investigated process fluid for 5-15 days while maintaining a constant pressure gradient on the core due to the energy of compressed air. Next, the filtrate of the process fluid that has penetrated into the core is displaced by oil in the opposite direction, at a steady pressure and a constant flow of oil through the core samples, the permeability coefficient after exposure to the process fluid and the permeability recovery factor are determined, the porosity of the core samples is determined after exposure to the process fluid. After that, X-ray tomography and electron microscopy data are processed before and after exposure to the process fluid and, according to X-ray fluorescence analysis, the change in the mineral composition of the rock after exposure to the process fluid is evaluated, the data obtained are compared and a conclusion is made about the efficiency or inefficiency of using the process fluid for specific geological and physical conditions.

EFFECT: efficient selection of process fluids for certain geological and physical conditions.

1 cl, 3 dwg, 2 tbl