METHOD FOR SAMPLING AND RECONSTRUCTING THE STRUCTURE OF THE SLUDGE TO DETERMINE THE RESERVOIR PROPERTIES AND MODELING THE FILTRATION AND PETROPHYSICAL CHARACTERISTICS OF ROCKS - THE "PSEUDOCORE" TECHNOLOGY Russian patent published in 2022 - IPC E21B49/00 G01N23/46 

FIELD: sludge research.

SUBSTANCE: invention relates to the field of sludge research to obtain the structure of the pore space of the reservoir, on the basis of which the reservoir properties are determined - porosity, the distribution of pores by equivalent diameters, and the filtration and petrophysical characteristics of the rock are modeled. According to the method, samples of drill cuttings are taken, while the outgoing drilling mud is filtered and taken into waterproof bags. Each package corresponds to a certain footage of well penetration, fix the depth corresponding to the position of the bottom of the well at the time of cuttings sampling. The cuttings rise delay is determined depending on the depth and speed of the drilling fluid, while when the circulation of the drilling fluid stops, the settling of the cuttings particles is taken into account. The resulting material is washed, dried, and particles resembling rocks are selected; X-ray computer microtomography of the selected particles is performed and their digital 3D models are reconstructed, based on the analysis of the structure of which it is determined that the structure of the sludge particle belongs to the original structure of the reservoir. Segmentation of the pore space structure is performed on a digital model of a cuttings particle, while determining the presence of secondary changes in the structure of the cuttings in the form of clogging of the pore space with drilling mud and the formation of secondary cracks, which are eliminated in the digital model: the clogged volume is included in the volume of the pore space structure, and secondary cracks excluded from it. On the resulting digital sludge model, reservoir properties are determined, including the porosity coefficient and the distribution of equivalent pore diameters in the volume of porosity; Based on the obtained structure of the pore space, the modeling of the filtration and petrophysical characteristics of the rock, such as permeability, porosity parameter, thermal conductivity and propagation velocities of longitudinal and transverse waves, is performed using software.

EFFECT: structure of the pore space of the reservoir obtaining method creation.

1 cl, 9 dwg