SU577293A2 - Device for taking gas and liquid samples from strata - Google Patents

Description

The device also includes two packers, the upper 16 and lower 17, the piston 1b with valves 19 and 20 and the spring 21, a sampler 22. The operation of the device is monitored by a pressure sensor 23.

The liquid for inflation of the packers 1b and 17 and to the piston iS enters through the channel a of the hydraulic system.

A sample from the reservoir in the sampler 22 enters the channel b .;

In order to prevent a hydraulic impact on the components and parts of the device at the time of communication of the sampling interval with the sampler 22, a channel B is provided for communicating the well above the upper 16 and below the lower 17 packers.

After the device is installed on the sampling interval from the surface, cable 1 supplies current to the electric motor 2, the rotation of which through the gearbox 3 is transmitted to the screw pair 4, which converts the rotation to return: a reciprocating movement of the piston 5.

Moving down, the piston 5 compresses the well fluid in the cylinder 6 supplied through the inlet valve 7 and creates an excessive pressure in it compared to the hydrostatic valve.

When determining the overpressure in the cylinder 6, the valve 8, spring-loaded by the spring 9, moves downwardly out of the cylinder cavity (J and the well fluid under overpressure enters the packer 1b and 17 and the piston ib. The spring 9 is designed to operate under overpressure 5-7 atm. The rod 10 with the valves 11 and 12 remains stationary, as the spring 13 is pre-compressed and calculated to operate at high pressures., .V.: After the piston 5 reaches the lowest position, the motor is reversed, and piston b starts moving upwards, the spring; 9 returns valve b to its original position and disconnects cylinder 6 from

.Packing cavities. The inlet valve 7 opens and the well fluid enters the cylinder 6.

reversing the motor 2, i.e. The piston 5 moves up and down automatically by the control panel on the surface, as the current consumed by the electric motor increases to the extreme positions of the piston 5. After the packers 16 and 17 are inflated, i.e. reliable sealing of the sampling interval, valve 20 enters the cavity of the instrument collection 22, and valve 19 separates the cavity of the well from the sampling interval. This is the best way to inflate the packers 1 1 17 and the actuation of valves 19 and 20 by selecting the spring 1: 1.

At the moment the sampler is communicated with the sampling interval, the pressure between the packers drops sharply and is compared with the atmospheric pressure in the sampler. At this point, the motor 2 is turned off. A mudcake is discharged and sample ij.3 of the reservoir enters through a channel in the sampler 22. The process of filling the sampler is monitored by a pressure sensor.

When the sampling process is completed, motor 2 is turned on and the well fluid is injected into the hydraulic system. Since the packers have already inflated, the piston 18 is in its lowest position, the pressure in the hydraulic system begins to rise.

With increasing pressure in the hydraulic system, the spring 13 deforms, the lower valve 12 enters the cavity of the chamber 14 and communicates the hydraulic system with the well, and the upper valve 11 at this moment divides the cavity of the cylinder 6 from the hydraulic system. The motor 2 then turns off.

under the action of the spring 21 from under the piston 1b and from under the packers 16 and 17, under the action of elastic forces, the fluid is displaced into the well, and the piston 18 and the packers 16 and 17 return to the initial position and the valve 20 seals the sample in the sampler 22. Such actuation of the upper 11 and lower 12 valves is achieved by selecting a pre-compressed spring 13.

When moving downward, the rod 10 with pin 15 overflows valve a and leads it out of the cavity of cylinder 6.

To bring the rod 10 with the upper 11 and lower 12 valves to the initial position, the motor 2 is reversed and the piston 5 moves upward. The pressure in the cylinder 6 drops and the spring 10 under the action of the spring 13 and the valve 8 returns to the initial position.

The necessity of connecting the rod 10 with the valve in the pin 15 is caused by the fact that if the valve 8 does not come out of the cavity of the cylinder 6, then the rod 10 will not be able to return to its original position, since the fluids from the cavity of the packers have nowhere to displace.

In this construction, the upper valve 11 first leaves the seat and only after that the valve 8 returns to its original position. This can be done as n & surface and in the well in the case of a dry sampling interval and when installing the device on the next sampling interval.

The economic effect of the introduction

one reservoir tester will be

2-3 thousand rubles, and the annual need about 60 devices.

Claims (1)

Invention Formula A device for sampling fluid and gas from the reservoir, according to ed. St. 22 F541977, characterized in that, in order to reduce the opening pressure of the filling valve, it is provided with a spring-loaded valve that is movably connected to the stem and located in the pump chamber.