SU737622A1 - Apparatus for testing water-bearing beds - Google Patents

Description

I

The invention relates to a drilling tool for sampling fluid and gas from formations.

A sampler is known, consisting of a housing, a fishing head with a pin, a receiving chamber, a piston, a valve, a hollow rod, a hollow screw with a filter, a seal and a drill bit 1.

When the aquifer meets, the sampler is drilled into the formation. Through the cavity of the drill pipe, a trap is placed on the cable, which is connected to the catcher head. By tensioning the cable, the piston rises together with the hollow rod and opens the filter holes in the screw cavity. The sampled fluid is sucked into the intake chamber of the sampler. As soon as the hollow rod comes out of the 5-screw auger, the valve closes the orifice, sealing the sample.

The disadvantage of this sampler is that the outer surface of the filter is the surface of the rock-destroying tool and, when screwed into the reservoir, interacts with the formation rock, this does not exclude the possibility of filter damage and blockage of the rock wall.

(especially in fine and fine-grained aquifer sands).

It is also known a device for testing aquifers, comprising a housing, a tip, a filter with a sample receiving chamber with a piston with a rod and a valve 2 movably mounted in the housing.

The disadvantage of this device is the inability to control and control from the surface the filter extension and filling of the sample chamber, i.e. the inability to control the sampling process at depth. ,

In addition, in this device, due to the lack of fixation of the filter relative to the housing, it is possible when the piston moves upward to be pulled back into the housing of the filter itself without liquid being taken. All this reduces the reliability of the device during the sampling.

The aim of the invention is to improve the reliability of the device during sampling.

. The goal is achieved by the fact that the filter is connected to the body by an extension spring and has

elements of its fixation in the housing and an additional chamber with a hollow piston rigidly connected with the piston rod of the sample receiving chamber, the over-piston. The cavity of the secondary chamber communicates with the housing cavity, and the hollow piston has a non-return valve.

FIG. 1 shows a device in section; in fig. 2 shows the wellhead equipment during sampling; in fig. 3 - the device, in a section, in the working position (left half) and in the transport position after the sampling (right half).

The device includes a pipe string 1, a housing 2, a probe-receiving chamber 3 with a piston 4, a rod 5, a filter 6 with a tip 7. A movable chamber 8 is attached to the upper part of the probe-receiving chamber 3, provided with locking elements 9. Kawejpa 8 is connected to the upper part of the housing 2 by a spring 10, and its cavity communicates with the cavity of the pipe string. The chamber 8 houses a piston II connected by a rod 5 with a piston 4. A pneumatic chamber 12 and a valve 13 are connected to the piston 11, which connects the cavity of the chamber 8 with the cavity of the pneumatic chamber 12. The chamber 12 communicates with the piston chamber of the chamber 8. The filter housing 6 mates with the inner surface of the housing 2 is movable in the axial direction and extending out of the cavity of the housing 2. The sample chamber 3 is connected to the filter 6 by means of the valve 14. In the hole of the thickened upper part of the movable chamber 8 there is a spring loaded with Packed sleeve 15, which interacts with the locking elements 9. In the cavity of the housing 2 is placed coaxially to the valve 13 stop 16. On the inner surface of the housing there is an annular groove 17 for the locking elements 9. Column I is equipped with a connecting hose 18, a pressure gauge 19, a regulating valve 20 and a shut-off valve valve 21 shutting off the supply of compressed air from the source.

Before descending into the sampler well, piston 11 moves to a lower position relative to chamber 8. Tip 7, filter 6, Probe chamber 3 and chamber 8 are held by force of spring 10 in the cavity of housing 2. The device is impacted by impulses imparted to the column on the surface into the aquifer at a given depth. On the surface, the column 1 is connected to the hose 18. The valve 20 is closed and the stop valve 21 is opened. Compressed air is supplied to the column, the pressure of which is greater than the hydrostatic pressure of the liquid at the bottom. Once the working pressure is established in the column (as judged by the pressure gauge 19), the winch device is raised above the face. In this case, compressed air fills the cavities.

COLUMNS of pipes, body 2, chamber 7 and the upper part of chamber 3. Air pressure opens valve 13, and compressed air fills air chamber 12. Since the pressure of compressed air in the cavity of body 2 is greater than the liquid pressure at the bottom, the filter b moves downwards and extends from the cavity of the housing 2, moves downwards and the chamber 8, stretching the spring 10. As soon as the axes of the locking elements 9 coincide with the axis of the annular groove 17, the spring-loaded stepped sleeve 15 moves downward, moves the elements 9 towards the annular groove and fixes them. The shut-off valve 21 is closed and monitors the readings of the pressure gauge 19. If the operating pressure in column 1 is maintained, this means that the filter 6 has completely come out of the cavity of the housing 2 and is fixed in this position. Next, adjusting the valve 20 to reduce the air pressure in the column 1 to atmospheric and the valve 20 is closed. At the same time, in the cavities of the column 1 and the body 2, the air pressure is equal to atmospheric, and in the pneumatic chamber 12 - to the worker, because as soon as the air pressure in the column 1 begins to fall, the valve 13 closes. As a result of the difference in air pressure, the piston 11 begins to move upwards, moving the piston 4. The receiving chamber 3 begins to fill the sample through the filter 6. At the same time, the pressure in the cavity of the housing 2 and column 1 gradually increases. At the end of its upward motion relative to the chamber 8, the piston 11 moves the stepped sleeve 15 upwards. Under the action of the spring 10, the locking elements 9 are mixed inward, the chamber 8, the chamber 3 and the filter 6 with the tip 7 move upwards, and the filter 6 enters into-. at the end of its stroke, the stop 16 opens the valve 13. With the column in the column, the air pressure sharply increases and the further increase in pressure stops. This suggests that the sample is taken. the filter 6 is completely moved into the cavity of the housing 2. The device is removed to the surface.

The adjusting valve 20 can create any air pressure drop b in chamber 8 (within the operating pressure) and thus the speed of movement of the piston 4 is given.

The presence of a pneumatic chamber in the device with a valve located in the pores makes it possible to accumulate energy

compressed air in it and at the same time regulate from the surface the energy consumption for moving the piston of the receiving chamber. Thus, the filling of the chamber with the breakdown occurs automatically according to a given pressure differential mode and is controlled from the surface. This makes it possible to reduce the complexity of the sampling process and improve the reliability of work.

Claims (2)

1. USSR author's certificate number 171342, cl. E 21 V 49/02, 1963. 2. USSR author's certificate No. 173158, cl. E 21 V 49/00, 1964 (prototype). -czt ag.2 737622