SU1472658A1 - Downhole valve unit - Google Patents

Abstract

The invention relates to the oil and gas industry. The purpose of the invention is to expand the functional capabilities of the device by allowing reverse circulation and a predetermined depression to the formation. The device includes a housing (K) 2 with circulating 3 and bleeding 4 channels, spring-loaded (P) 5 hollow bushing (B) 6 with holes 7, connected to the column pipe 1, adjusting nut 8, ball retainer 9 and safety P 10 . The depression channels 11 and axial holes 12 are made in K 2 to communicate the cavity K 2 with the tubular and annular space, respectively. A spring 10 is placed between K 2 and B 6. To place the retainer ball in B 6, an annular groove 13 is provided in its extreme left position. The nut 8 is installed in K 2 movably and with the possibility of interaction with P 5. During the descent into the well of the device B, 6 periodically moves to the extreme right position, and its hole 7 communicates with channels 11 in K 2, which provides a given depression to the formation when well testing. For direct and reverse circulation, the pressure in the string of pipes 1 and B 6 is increased to the extreme left position. Holes 7 and channels 3 are aligned. The amount of depression on the reservoir is controlled by a nut 8. The presence of P 10 in the cavity K 2 prevents premature movement of B 6 during hydraulic shocks and increases the reliability of the device. 1 il.

Description

one

FIELD OF THE INVENTION The invention relates to the oil and gas industry, in particular to well valve devices for testing and developing wells.

The purpose of the invention is to expand the functional capabilities of the device by providing the possibility of reverse circulation and a given depression to the reservoir.

The drawing shows the device section.

The downhole valve device includes a housing 2 connected to the pipe string 1 with circulating 3 and bleeding 4 channels, sub-pipe 311472658

spring-loaded 5 hollow bushing 6 with bore 7, adjusting nut 8, ball retainer 9 and safety spring 10. Depression channels 11 and axial bore 12 are also provided in the case, and an annular groove 13 is placed on the bushing to accommodate the retainer ball 9. Mezkda

In order to conduct direct and reverse circulation in the pipes 1, they create a pressure that exceeds the force of the spring 10 and the forward pressure. In this case, the sleeve 6 moves to the extreme left position, and the ball of the retainer 9 falls into the groove 13 and fixes the sleeve. Holes 7 are aligned

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a sleeve and a housing are placed on the seal 10 with circulation channels 3 of the housing 14. The spring 10 is placed in the housing 2 between it by the sleeve 6, and the nut 8 is mounted in the housing 2 movably with the possibility of interaction with the spring 5.15

The downhole valve assembly operates in the following manner.

Before lowering into the well (not shown in the drawing), the spring 5 is adjusted by the nut 8 to a predetermined depression. During the descent process, the annular pressure always exceeds the intratubular pressure, and the sleeve 6, compressing the spring 5, tends to occupy the right position. When the annular pressure exceeds the force of the spring 5, the holes 7 of the bushings 6 are aligned with the depression channels 11 of the housing 2 and the liquid — from the annulus through the hole 12 enters the pipes. Thus, the difference between the annular and intratubular pressures is preserved by the spring, to which the spring 7 is tuned, which ensures that tests with a given depression are performed on the 35th formation in the case when the valve device is lowered in a lineup with a plastic tester. Spring 10 prevents prior operation of the device against hydraulic 40 shocks in the process of tripping.

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2 and the possibility of direct and reverse circulation.

Claims (1)

Invention Formula .including connected to the column: a casing with circulating and piping channels and a spring-loaded semi-in-tulk that is movably placed in a housing with openings for periodic communication with circulation channels, characterized in that, in order to expand the functional capabilities of the device by providing reverse circulation and a given depression to the formation, equipped with an adjusting nut, a ball retainer and a safety spring, and the housing is filled with depression channels and an axial bore for communication of the housing cavity with the pipe one. naturally, the sleeve is made with an annular groove for placing the retainer ball in its leftmost position, the safety spring is placed in the housing between it and the sleeve, and the adjusting nut is installed in the housing movably with the possibility of interaction with the spring of the sleeve. with circulation channels 3 2 and the possibility of direct and reverse circulation. Invention Formula including associated with the column: a casing with circulating and piping channels and a spring-loaded semi-in-tulk that is movably placed in a housing with openings for periodic communication with circulation channels, characterized in that, in order to expand the functionality of the device by providing reverse circulation and a predetermined depression to the formation, it is equipped adjusting nut, ball retainer and safety spring, and the housing is made with depression channels and an axial bore to communicate the housing cavity with the pipe. naturally, the sleeve is made with an annular groove for placing the retainer ball in its leftmost position, the safety spring is placed in the housing between it and the sleeve, and the adjusting nut is installed in the housing movably with the possibility of interaction with the spring of the sleeve.