SU1452965A1 - Arrangement for investigating and testing formations - Google Patents

Abstract

This invention relates to geophysical and geochemical well survey methods. The goal is to increase the safety of work. The device contains a housing, a piston pump with suction 6 and discharge 7 valves, installed respectively in the suction 17 and inlet: 18 channels. The hydraulic packers 16 are connected with the latter. The device has a flow-through sampling chamber 15 with spool valves.

Description

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The invention relates to geophysical and geochemical research methods, namely, devices that run on a caravan cable into the well and are designed to carry out operational and sequential methods by determining the hydrodynamic properties of the layers and the nature of the iHx.

The aim of the invention is to improve the safety of work.

The drawing schematically shows the proposed device.

The device contains an electric motor 1 placed in a housing, a piston pump that includes a crankshaft 2, a connecting rod 3 and a piston 4 placed in a working chamber 5, a suction 6 and a pressure 7 valves installed in the respective channels, an overrunning clutch 8 with intermediate draft 9 , valve 10, spring-loaded relative to the body, opening the packers, valve 11, overflow valve 12, spool-sealing valves 13 and 14, connecting the flow-through sampling chamber 15 with the packer zone of the packers 16 and the suction channel 17, discharge channel ay-18 and 19, an inflow hole with a sampling channel 20, channels 21-23 communicated with the well. The device is equipped with an emergency spool valve 24, spring-loaded relative to the body and installed in an additional chamber 25. Last section 15

There are three sections communicated with the above-packer space, the suction channel 17 and the inter-packer zone, and the section connected with the suction channel 17 is designed to be sealed from the other two sections of the additional chamber. The device is also equipped with a pressure transducer 26 and a resistivity meter 27.

In the initial position, the research institutes are spring-loaded valves 13 and 14 for sealing the sample are closed and the flow-through sampling chamber 15 is sealed. An overflow valve 12 connects the suction channel 17 to the channel 21 communicated with the well, and closes the discharge channel 18. A spring-loaded valve 10 for opening the packers isolates the pressure channel 19 from the channel 22 communicated with the well. The emergency valve 24 is in the extreme left position and informs the aspirated channel 17 with channel 23 communicating with the well.

After installation of the device on the object under study, using the converter 26, the pressure in the well is fixed and the electric motor 1 is turned on, the crankshaft 2 through the connecting rod 3 causes the piston 4 to reciprocate. When the piston 4 moves up the well fluid through the channels 21 and 17 through

35, the suction valve 6 is supplied to the working chamber 5. As the piston 20 moves

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n the downhole fluid is expelled from the working chamber 5 through the discharge valve 7 into the discharge channel 18, and from there, through the valve 11 and the channel 19, into the cavity of the hydraulic packers 16. The fluid is injected into the cavity of the packers. After the packers have reached a pressure sufficient to reliably seal the test interval from the wellbore, valves 13 and 14 are activated to seal the sample, which, compressing the springs, move to the left, together with the flow sensor, the sampling chamber 15 through the sampling channel 20 with the interpacker zone and suction channel 17. With a further increase in pressure in the cavity of the packers, the overflow valve 12 is opened, which, under the influence of excess fluid pressure in the channel 19, moves to the left, compressing the spring, while The injection channel 18 is connected to the well through the channel 21, and the suction channel 17 is sealed. At the same time, after sealing by the packers of the studied interval, the pressure in the interpacker zone begins to drop to the reservoir. In this case, if the pressure difference in the well and formation is greater than the pressure determined by the force of the return spring, the emergency valve 24 moves to the right, the suction channel 17 is sealed from the channel 23 communicated with the well, and communicates with the inter-cracker zone. During further operation of the pump, fluid from the interpacker zone through channel 20 for sampling through valve 14, flow sampling chamber 15, valves 13, 14, 12 and 6 enters the working chamber 5 of the pump, and from there through channels 18 and 21 into the well. The check valve 11 prevents pressure reduction in channel 19 and the packer cavity 16. The process of pumping fluid from the formation into the well is carried out. At the same time

The hydrodynamic valves are measured, the diameters of the reservoir are communicated by the pressure transducer 26, and a characteristic of the composition of the fluid is given, which is monitored by a resistive meter 27. When the pumping of the reservoir is completed, the pump is turned off.

If the pressure in the well decreases during the pumping process, the pressure difference between the well and the inter-packer

it has an interpacker zone and a suction channel, which is different in that it is equipped with an emergency spool valve spring-loaded relative to the body to ensure that it can be safely installed, and an additional valve is installed in the body.

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the zone will be less than the pressure determined by the force of the return spring; the emergency valve 24 moves to the left, isolating the suction channel 17 from the interpacker zone and in common with the well. In this case, the pressure transducer 26 will record: the hydrostatic pressure has changed. The pumping process is stopped and the pump is turned off.

In order to remove the device from the test interval and seal the sample in the sampling chamber 15, the electric motor 1 is reversed. In this case, the overrunning clutch 8 is rotated with the crankshaft 2 and through the intermediate cable 9 acts on the spring-loaded valve 10 to open the packers. Valve 10 moves down and informs channels 19 and 22. Fluid from the packer cavity through channels 19 and 22 is displaced into the well, while pressure in channel 19 decreases, valves 13, 14 and 12 are sealed by the spring and the sample in the sampling chamber 15 is sealed . After compressing the packers 16 under the influence of elastic forces, the electric motor 1 is turned off and the valve 10 under the influence of the spring returns to its original position. Valve 24 after depressurization of the studied interval also returns to its original position. A device with a sealed sample can be lifted to the surface or transferred to another test object.

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Claims (1)

Invention Formula A device for researching and testing formations, comprising a housing, a piston pump with suction and discharge valves installed in the respective channels, hydraulic packers communicated with the discharge channel, a flow-through robust chamber with spool valves. with interpacker zone and suction channel, characterized by the fact that, for the sake of safety, it is equipped with an emergency slide valve, spring-loaded relative to the housing, and an additional chamber is installed in the housing, and an emergency valve is installed in addition514529656 ry chamber, the last divided into section, communicated with the suction | gri section reported by the corresponding channel, made with the possibility yo about nadpakerny space, all-sealing from the other two sections digging channel and interpacker zone. extra camera.