RU1798490C - Hydrodynamic logging device - Google Patents

Description

her 8 and 13 are filled with air at atmospheric pressure,

In FIG. Figure 2 shows the technical pressure diagram recorded in the study of high and medium permeable formations.

Symbols and indices in FIG. 2.: .., ..

River - the pressure of the column of flushing fluid in the well

Po is the initial pressure in the system; the drain cavity is a sample receiver

PL Ra, Pz - pressure inflow into the measuring chambers of the first, second and third telescopic pistons of the sampler. : .. ..:.: ;; .., ..,: ... .....

RST is the inflow pressure into the measuring chamber of the telescopic piston of the drain cavity. ::

Rll - reservoir pressure

Rnas is the saturation pressure of the formation fluid.

ON-moments of turning on the drive move-forward and move-back ...

In FIG. Figure 3 shows an exemplary pressure diagram for device testing of low permeability formations. :

The designation to is the time between turning on the actuator to open the valve 5 of the receiver and turning on the actuator to close it (switching to the drain cavity). The remaining symbols are the same as in Fig. 2.

The hydrodynamic logging device operates as follows.

After the device is lowered and installed on the test interval by turning on the actuator 2 from the surface of the actuator 2, the pressure lever 3 is opened, the device is pressed with a shoe 11 against the well wall, valve 4 is closed by isolating the drain cavity 10 from the well, valve 6 is closed, valve 5 is opened, communicating with the drain cavity and the formation with a sampler. Since air is at atmospheric pressure at the beginning of the study in the cavity 7 of the sampler, when the valve 5 is opened, atmospheric pressure is also created in the reservoir-sampler system. In this case, the telescopic piston 13 of the drain cavity under the action of pressure from the side of the well through the channel 14 occupies the lowermost position of the release of the measuring chamber 15.

Having created a depression in the drain cavity 10, the difference between the reservoir and atmospheric pressures breaks off the clay crust in the near-well part of the reservoir, a depression funnel is formed and the reservoir fluid flows from the reservoir into the device (sample receiver).

In the study, high and medium. downstream collectors, when telescopic pistons 8 come into operation immediately after opening the selection valve 5, the telescopic piston 13 (see Fig. 2) also works in a certain sequence, i.e., each of them, due to its differentiation coefficient, provides an influx into the measuring pressure chambers Pi-P2PCT-RZ. : ;; -; - ;: l; -:,;::.,: Ух ..., -, .. investigation of low-permeability collectors after the standard operation to control the actuator and open valve 6 of the receiver, there is no increase in pressure in the initial chamber of the receiver for enough long time to (usually 1-1.5 min), the operator from the surface turns on the actuator to close the valve 5 of the receiver. Then thanks a little

the total measuring chamber of the telescopic piston 13 of the drain cavity, its closing time is much faster than any of the sample chamber chambers (see

FIG. 3). -; ;; - ;:. : .-; ::.;: ;; -. : ....

After filling all the measuring

chambers of telescopic pistons for sampling or chambers for telescopic pistons of the drain cavity common to all cases

the operation is the sequential opening of valves 6 and 4, Pressure c. the drain cavity 10 is aligned with the borehole, the lever 3 is removed and the device is ready to move to the next section of the study. ; ; ,; ....

The geological and economic effect of the use of the device is due to the reduction of the study time mainly when hydrodynamic logging of low permeability reservoir rocks; expanding the scope of application of GDK devices and methods in the study of low prot

open collectors, makes it possible to significantly reduce the assessment criterion for a collector-non-collector, and therefore to predict an increase in effective thicknesses, that is, an increase in oil and gas reserves.

SUMMARY OF THE INVENTION A device for hydrodynamic logging, comprising a housing with an electric actuator located therein, a clamping system, pressure equalization, sampling and discharge valves, a sealing shoe with a cavity,

a pressure transducer, a receiver with a system of telescopic pistons, distinguishing it by the fact that, in order to expand the scope of application, to increase the efficiency in work in deep wells, it is equipped with an additional

a telescopic piston, the nadporshne part of which is connected with the drain cavity, and made with a smaller sample than the telescopic pistons of the receiver; volume of a measuring chamber, with a coefficient

differentiation, different from the coefficients of differentiation of these pistons, and providing an excess of the inflow pressure over the saturation pressure of the reservoir fluid.

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