RESERVOIR FLUID SAMPLER Russian patent published in 2019 - IPC E21B49/08 

FIELD: sampling.

SUBSTANCE: invention relates to hydrogeological investigations of wells and is intended for extraction of bottom-hole fluid samples in wells. Reservoir fluid sampler comprises a fluid sampling system with a reservoir fluid sampling and storage valve, a logic electrohydraulic system for fixing and releasing the sampler, which includes a first motor, which is connected to the first pump connected to the first distributor through the first check valve, to the first filter, to the first safety valve connected to the tank, wherein the pressure port of the first distributor is also connected to the second distributor and the reservoir fluid sampling and storage valve, wherein first distributor is connected to piston cavities of first, second and third hydraulic cylinders, rod cavities of which are connected to third distributor, to hydraulic accumulator and sensors, and second distributor is connected to drain cavity of third hydraulic cylinder via second check valve. Sampler comprises second and third filters of first tank, wherein sensors are made in form of first oil pressure sensor, second oil pressure sensor, first pressure sensor of reservoir fluid, reservoir fluid temperature sensor and connected to the first and second valves of the pumping module, which additionally includes the fourth distributor, the pressure cavity of which is connected through the third check valve to the fifth distributor, and the fourth distributor drain cavity is connected to the fifth distributor by the fourth check valve, wherein pressure port of second distributor is connected to pressure port of three-position distributor, and drain port through fifth check valve and second check valve is connected to drain port of three-position distributor, first port of which is connected to first storage chamber valve, and second port is connected to second storage chamber valve, fluid channels of which are connected to humidity sensor and resistivity sensor, and piston cavities are connected to sixth and seventh check valves, wherein the resistivity sensor is connected to the second formation pressure sensor which is connected to the pumping module, the rod of which is connected to the displacement sensor, and the oil ports of the pumping module are connected to the fifth distributor, the pressure chamber of which is connected to the third oil pressure sensor, and the drain cavity with the fourth filter, wherein the third oil pressure sensor is connected to the fifth filter through the eighth check valve and through the second safety valve, which drain cavity is connected to the sixth filter and to the second pump, which is connected to the second electric motor and to the fourth oil pressure sensor, which cavity is connected to equalizing valve, besides, all distributors are made with electromagnetic control and spring-return mechanism.

EFFECT: claimed invention ensures high reliability of sampler, automation of sampling due to application of logic electrohydraulic system and selection of at least two qualitative samples of reservoir fluid per one descent of sampler into well.

1 cl, 1 dwg