SU51024A1 - Fluid sampler, for example, from boreholes - Google Patents

Description

The proposed device is intended for sampling fluid, for example, from boreholes, and is of the type in which the sampling cylinder with spring-loaded pistons is lowered onto the hollow rod and the impact on the pistons is produced by the fluid pumped along the rods.

A feature of this instrument is the possibility of obtaining the highest purity of the sample due to the fact that the free space where the test liquid is sucked in is obtained only at the point of sampling.

The drawing shows a longitudinal section of the device, screwed on the rod, lowered into the well.

The device consists of a sampling cylinder 4, 4a, divided into two parts by a sub 5. Top cover 3 of the cylinder through the nipple 2 connects the cylinder with a hollow rod /. The bottom cover 6 has an orifice and a ball valve 10a for discharging fluid during the piston stroke 7a downwards. A rod 8 passes through the sub 5, pistons 7 and 7a spring-loaded at both ends, spring-loaded 9. For suction of the fluid sample in the sub 5, there are channels // passing into the chamber 4a; the channels are closed with ball valves 10.

The device operates as follows. By tensioning the spring 9, the pistons 7 and 7a are lifted to the upper position, with the lower piston 7a being pressed against the sub 5. In this state, the device on the hollow rods is lowered to the required depth. Having reached the desired depth, the device is repeatedly raised up and down to refresh the liquid in the supply channels 11, and then pump the liquid through the rods 1. Under the pressure of the injected fluid, the pistons 7 and 7a move downward, compressing the spring 9 and freeing the volume in the cylinder 4a. above the piston 7a. This volume will be filled with fluid coming from the well through the supply channels 11 and the valve 10.

After the pressure in the pump rises to a certain limit, which will indicate that the pistons 7 and 7a have reached the lower position, the injection stops and the pressure in the system gradually decreases. The piston 7a under the action of the spring 9 compresses the fluid in the cylinder 4a and tightly closes the valve 10. After that, the device on the rod / lift up.

The subject matter of the invention.

A device for sampling fluid, for example, from boreholes, lowered onto hollow rods and consisting of a sampling cylinder with a piston spring-loaded inside it, which raises the pressure being pumped along the rods.

fluid, characterized in that the piston rod 8 of the piston 7 is passed through the sub 5, which divides the sampling vessel into two parts, and is equipped with a piston 7a located in the lower compartment of this vessel, which serves for lowering the pistons 7, 7a under the action of suction fluid pumped along the rods 1 fluid samples through the valve 10 in the sub 5, and when raising the pistons to close the valve 10.