SU622971A1 - Device for hydrodynamic investigations of seam - Google Patents

Description

I

This invention relates to a well logging survey of instruments on a cable.

A device for processing the near-wellbore zone of the formation and its subsequent testing contains in the channel connecting the sealing elements to the sampling chambers, pressure sensors, formation fluid resistance and formation fluid intake velocity. The speed is determined by the presence of chokes through which water flows to the buffer tank with air flj.

A disadvantage of this device is the impossibility of registering the values of the pressure drop (depression) in the process of selecting a formation fluid, since an additional descent of the instrument is required to determine the formation pressure in the interval under study.

It is also known a device for hydrodynamic researched formations, containing a sealing element, controlled valves, a depression controller, samplers for initial and final samples 2

This device is the closest to the technical essence and the achieved result to the described invention.

A significant disadvantage of the known device is that both pressure sensors installed in the cavities of the corresponding sealing elements are designed to measure the total value of the reservoir (or hydrostatic) pressure in the study interval. However, such wide-range sensors cannot provide sufficient accuracy in measuring the pressure drop (depression), which is 3-5% of the reservoir pressure.

The aim of the invention is to improve the accuracy of measuring the magnitude of the pressure drop.

Claims (2)

The goal is achieved by the fact that the device has an intermediate tank and is equipped with a differential pressure sensor; the intermediate tank has a splitting piston and communicated on one side with the sampler of the initial sample and on the other side - with the depression controller and one of the cavities of the differential pressure sensor, the other cavity of Eotorhoi communicated with the cavity of the sealing element through a controllable valve. The drawing shows a schematic diagram of the device in a static state. The device is lowered on a three-core cable and contains a capacitance 1 with an intermittent piston 2, a cavity under which is communicated with a differential pressure sensor 3 and a depression controller 4, made to the fault of the piston-valve and spring 5. The cavity above the separating piston 2 is permanently connected by the channel to the sampler NICK 6, the initial sample and the pressure sensor 7. The device is pressed against the borehole wall with a sealing element using a paw 9 controlled by an electrically driven surface (not shown). Aaiai 10, which is controlled, for example, in the form of a butterfly valve, serves to successively communicate the cavity of the sealing unit 8 by the sampler 6 of the initial sample and then through the depression regulator 4 with the sampler 11 of the final sample. The device works as follows. In the study interval, by means of commands from the surface, paw 9 extends and presses the device with a sealing element 8 against the wall {lЫJisolir of the investigated part of the reservoir from the well. The valve 1O rotates 9O (clockwise), together the cavity of the sealing element 8 with the sampler 6 of the initial sample. Under the action of a reservoir pressure drop at atmospheric pressure, the initial sampling of fluid from the bottom zone and the reservoir enters the sampler 6 until it is completely filled and the pressure is restored to the reservoir. The change in pressure in the sampler 6 of the initial sample is transmitted to the separation piston 2, which, moving, creates a pressure in the intermediate tank 1 equal to the reservoir pressure. The entire process of filling the sampler 6 of the initial sample is recorded by the pressure sensor 7. The control element of the differential sensor remains unloaded because the pressure in the cavity of the hydraulic element 8 and the channel informing intermediate tank 1 with pressure sensor 3 is the same. Under the pressure of compressed air in the intermediate tank 1, the depression regulator 4, overcoming the spring force S, closes the channel from the controlled valve 10 to the sampler 11 of the final sample. After the sampler 6 is filled up with the initial sample and pressure is restored therein to the reservoir, the controlled valve Yu turns another 90 and informs the cavity of the sealing element 8 through depression controller 4 with the sampler II of the final sample. . . After filling the sampler 11 with the final sample, which is recorded on the recorder, defining the differential sensor 3 to zero (the spans in the cavity of the sealing element 8 and intermediate tank 1 are equal to the reservoir), the controlled clan is rotated by 9o from the surface °. All the channels of the device are closed off from the cavity of the sealing element 8, P & 9 are pressed from the wall by the skeleton. Device The structure is ready to lift. The use of the device will allow to obtain, first of all, the geological effect, due to the increased accuracy and informativeness of the readings, and therefore, the expansion of the methodological possibilities in determining the hydrodynamic parameters. This will allow a more efficient solution of the issues of counting, oil and gas reserves, and designing development methods. The invention The device for hydrodynamic studies of the reservoir containing a sealing element, controlled valves, depression controller, npo6ooT6of initial and final test, characterized in that, in order to improve the accuracy of measuring the value of differential pressure, it is equipped with an intermediate tank with a separating piston and a differential pressure sensor, capacitance communicated on one side with the sampler of the initial 56 sample, and on the other with the pressure regulator and with the oana of the cavities of the differential sensor and laziness other p6post which communicates with the cavity of the sealing member through upravogemy valve. 971 Sources of information taken into account during the examination: 1. Patent CJJA No. 3273647, cl. 73-g, 1566. 2. USSR author's certificate 5 NO 47143О, cl. E 21 to 49 / GS, 1972.