DEVICE FOR HYDRODYNAMIC LOGGING OF WELLS Russian patent published in 2022 - IPC E21B49/00 

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used for hydrodynamic studies of open wells with wireline and coiled tubing instruments. The proposed device is made in the form of two hermetic blocks separated by a clamping system made in the form of a pantograph-type multi-link lever mechanism with a sealing element and a channel. The first block contains a telemetry unit, a power supply connected to the sample receiver drive rigidly connected to the piston rod located in the cylinder of the depression chamber, the over-piston cavity of which is connected by a hydraulic channel to the piston located in the under-piston cavity of the depression chamber, which acts on the hydraulic valve that uncouples the under-piston cavity of the chamber depressions with the cavity of the buffer hydraulic cylinder, inside which a piston is installed, which abuts against the rod of the first piston located in the cylinder of the sample receiver, the piston cavity of which is connected by a channel with a pressure sensor and a sealing element. In the over-piston cavity of the sample receiver, annular differential pistons are placed. The second block contains a rod in contact with the pressure system drive piston, a separating piston for separating the hydraulic fluid from the well fluid, connected by a channel to the pressure system drive piston, a pressure switch, an electromagnetic valve connected by channels to the said piston and to the discharge chamber. The first block of the device contains a separate chamber for sampling formation fluid and extracting samples to the surface, separated from the sample receiver channel by means of an electromagnetic valve, a measuring unit, the flowing internal cavity of which contains a moisture meter, a resistivity meter and a pressure sensor and is connected to the sample receiver channel, and through a hydraulic the reservoir fluid selection valve with the channel of the lever mechanism of the clamping system with a sealing element and is also connected through the reservoir fluid discharge hydraulic valve with the well. The upper annular differential piston of the sample receiver is replaceable, located on the rod of the first piston of the sample receiver and installed inside the replaceable sleeve, the over-piston cavity of the sample receiver is filled with hydraulic fluid, and a separating piston is placed in it, designed to influence the hydrostatic pressure of the well on the hydraulic fluid.

EFFECT: increasing the accuracy of determining the hydrodynamic and physical characteristics of permeable formations while expanding the area of its use, as well as the possibility of multiple fluid sampling at a fixed point with control of physical characteristics and multiple fluid release, which ensures the flushing of the formation pores in the zone of penetration of the drilling fluid and obtaining the true characteristics of the formation permeability; in addition, the device allows to take a sample of formation fluid for delivery and analysis on the surface.

3 cl, 4 dwg