SU1209831A1 - Arrangement for operating gas well with water inflow - Google Patents

Description

The invention relates to the oil and gas industry and can be used in the operation of watering gas wells at different stages of watering.

The aim of the invention is to expand the technological capabilities of the device by ensuring that it is used at various stages of the flooding of a gas well.

Fig. 1 schematically shows a device for operating a gas-bypass gas well, section | figure 2 - node I in figure 1.

 The device contains a column of lifting pipes 15 located concentric in the column of casing pipes 2 and connected via branch 3 and valve 4 to the discharge line 5, a working chamber made in the form of even 6 and odd 7 sections, which are communicated respectively through gas pipelines made in the form of two pipelines 8 and 9 and through a three-position switch 10 with annular space: 11 and with discharge line 5. The column of lifting pipes 1 forms, with an operating chamber in even 7 and odd 6 sections, annular chambers 12 A ball check valve 13 is installed with a side chamber 14 and a float valve 15 which connects the column of lifting pipes 1 with sections 6 and 7, the latter being separated by partitions 16, through which the columns of lifting pipes 1 pass and the pipelines 8 and 9, on which there are holes 17 and 18 located respectively in the upper parts of each even 6 and odd 7 sections. A ball check valve 19 with a side chamber 20 is installed at the lower end of the column of the lifting pipe 1.

The device works as follows.

The liquid and gas coming from the reservoir are separated in the well, while gas accumulates in the upper part of the annulus 11 (with the valve 4 closed), where its pressure increases and becomes much higher than the pressure in the flow line 5, and the liquid accumulates down to the bottomhole and flows in the column lifting pipe 1.

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Depending on the stage of well operation, the device operates in certain modes.

For gas lift

5, the three-position switch 10 is set to a position in which the working gas from annulus 11 nap 0 is simultaneously in both pipelines 8 and 9, while the float valves 15 are closed, which prevents the well fluid from entering in sections 6 and 7, When a layer

15, the energy of the gas provides sufficient speed of movement of the gas-liquid mixture (TGS) in the column of risers 1, the well fluid is carried to the surface and does not accumulate

20 at the bottom of the well and in the column of lifting pipes 1; however, the ball check valves 13 and 19 are introduced into the lateral chambers 14 and 20 by the GLS flow and do not hinder its movement.

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By reducing the reservoir pressure

the movement speed of the SHC is also reduced. Fluid accumulates at the bottom of the well and in the lifting pipe string 1. It is necessary to remove the liquid. To do this, the device is switched to operation in the step-lift mode. Manipulir three-position switch 10, the working gas from

35 annular space 11 is directed alternately to even 6 and odd 7 sections of the working chamber. When fluid accumulates in the lower section 7, the switch 10 is set to a position in which the working gas from the annular space 11 is directed to the pipeline 9, and the pipeline 8 is connected to the flow line 5. At the same time

 the liquid enters section 7 through valve 19 and float valve 15, and into the column of lifting pipes 1 through valve 13. After filling the bottom section 7 with well liquid (time

50 filling is established empirically) a time relay is activated (not shown), and the switch 10 is set to the position at which pipeline 5 is communicating

55 seconds, you are fed by a line 5, and the working gas is directed to pipeline 9, and displaces the liquid from section 7 through the float valve 15 (which is from

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closed as long as it is in the fluid) and ball check valve 13 through the column of lifting pipes 1 into the super-even section 6, while valve 19 blocks the flow of fluid from section 7 down to the bottom of the well.

As the liquid is displaced from section 7 to section 6, the float check valve 13 in section 7 goes down and closes the bore, which prevents unproductive consumption of the working gas. Then, time is triggered and the switch 10 is set to the position at which the pipeline 9 communicates with the flow line 5, and the working gas from the annular space 11 is directed to the pipeline 8, the liquid is displaced from section 6 to the upstream odd section 7, while

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fluid flows from the bottom of the well into the vacated lowest odd section 7. Thus, alternately squeezing the working gas from one section of the working chamber to another section, the liquid flows through the riser pipe 1 to the flow line 5 to the surface.

After all the fluid is pumped from the bottom of the well (fluid flow 5 does not flow from the lifting pipe string 1 at any position of the switch 10), the remaining fluid accumulated in the lifting string is blown into the atmosphere and the well is operated in gas lift mode through the lifting string 1 to as long as the fluid does not accumulate again at the bottom of the well, after which the device is again switched to the operation mode of the step liquid elevator.

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. Order 479/40 Subscription

Branch ShSh Patent, Uzhgorod, Proektna St., 4

Claims (1)

A DEVICE FOR OPERATING A WATERFILLING GAS WELL, containing concentrically installed casing and lifting pipe columns, a flow line connected to the annulus through a discharge with a valve, a working chamber made in the form of successively installed and hydraulically interconnected sections, a gas pipeline made in the form of two sections pipelines with a switch alternately communicating the sections of the working chamber with the annular space and the discharge line, check ball and float valves, which installed in each section of the working chamber, characterized in that, in order to expand the technological capabilities of the device by ensuring its use at different stages of watering a gas well, a column of lifting pipes and a gas pipe are placed inside the working chamber, forming a column of lifting pipes in even and odd sections annular chambers, at the bottom of each of which; A float valve is installed, which communicates an annular chamber with a column of lifting pipes, and a non-return ball valve mounted above it.