SU1209830A1 - Well-operating arrangement - Google Patents

Description

The invention relates to the oil and gas industry, namely to devices for producing gas from thick formations.

The purpose of the invention is to improve the efficiency of operation of the device due to the redistribution of gas flow from the reservoir to the lift pipe string.

FIG. Figure 1 shows the layout of the device in the well when all gas moves through the lower part of the tubing; Fig. 2 is a diagram of the device when a part of the gas moves from the annular space to the lift column; Fig. 3 is a diagram of the bypass device.

The device contains a production string 1, inside of which is placed the liner of the tubing string 2, connected to the tubing column 3 by the sub 4. The sleeve 5 covers with its tide 6 holes 7 in the sub 4. The lower part of the sleeve 5 senses the gas pressure in the column 2, and the upper part - column 3. The sleeve 5 can be made in the form of a main sleeve 8 and an fitted sleeve 9 placed in the sub 4, as well as in the form of a combined device consisting of a sleeve connected to the valve element.

The device works as follows.

Gas enters the well from

layer, passes through the bottom of the tubing string 2 and the central channel 10 of the sleeve 5j holes 7 are blocked, the Central channel 10 is always open and does not restrict the flow of gas through the lift column. With an increase in the gas flow rate, the pressure drop across the sleeve 5 increases until the gas flow rate is small and the fluid at the bottom of the well does not rise, the holes. remain overlapped. When the gas flow rate reaches a predetermined level at which the pressure loss in the shank is minimal, the holes 7 are still closed. Only

ten

f5

- five

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after a further increase in gas inflow from the reservoir, after the gas pressure on the sleeve 5 from below increases its weight, the sleeve 5 rises, openings 7 open and gas from the annulus enters the lift column 3. The sleeve 5 is maintained by the gas flow from the column float rotameter. Depending on the lifting height of the sleeve 5, the degree of opening of the holes 7 varies, the gas flow through the holes 7 changes accordingly. Depending on the flow rate of the well, with a constant flow of gas through the central channel 10, the degree of opening of the holes 7 and the gas flow through them, t . the gas flow through the central channel 10 controls the flow from the holes 7, this eliminates 7 the decrease in gas flow through column 2 below a predetermined level.

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The flow rate of gas or gas-liquid mixture passing through column 2 is maintained at a given constant level depending on the weight of the sleeve 5 and the cross section of the central channel 10. In cases of low weight of the sleeve 5, an additional spring can be applied to it. To limit the stroke of the sleeve 5, the device has limiters (not shown). The device can be installed permanently during the construction of the well or can be lowered during operation using a cable or pipe string. In this case, the socket of the device must have a packer and locking device. In the operating production wells, the device can be lowered with a set of pipes of a small-diameter tubular string in order to exclude operations to lift a large-diameter string. The bottom of column 2 in this case can rest against the bottom of the well or is at the required level from it.

FIG. 2

Fig.Z

Claims (1)

DEVICE FOR OPERATION OF WELLS with a large perforation interval, containing an elevator pipe string connected to the shank by means of a sub, characterized in that, in order to increase the efficiency of its work due to the redistribution of the gas flow from the reservoir into the pipe elevator string, it is equipped with a sleeve concentrically installed in the sub with an annular protrusion at the upper end, and in the sub holes are made, and the sleeve is placed with the possibility of overlapping holes. Figure 1 and .... 1209830