RU2058476C1 - Gear removing fluid from gas and gas-and-condensate wells - Google Patents

Abstract

FIELD: gas production. SUBSTANCE: in compliance with proposed gear fluid running down internal surface of pump and compressor pipe is collected in chamber formed by this surface and branch pipe. Chamber is sealed from beneath. When water from chamber reaches level of holes of taps manufactured in the form of vertical knee pipes it is discharged from chamber in to gas flow through knee pipes placed vertically on chamber. For prevention of fluid running down internal wall of branch pipe through holes wall is coated with hydrophobic material. EFFECT: increased efficiency of operation of gear thanks to prevention of collection of fluid in face of hole and to implementation of its spontaneous discharge into gas flow. 1 dwg

Description

 The invention relates to the gas industry and can be used in the operation of flooded gas and gas condensate wells.

 A device for lifting fluid from the bottom of the well [1] consisting of nodes capture and fixation and a dispersing element with a housing. The dispersion of the liquid in this device is carried out in the annular gap between the elastic plates of the dispersing element and the inner cavity of the column of elevator pipes. The optimal dispersion condition for the liquid is achieved by the constancy of the gas-liquid flow rate (GJF), which is ensured by the regulation of the annular gap.

 The known device does not provide maximum removal of the wall layer flowing down the inner wall of the pipe fluid.

 Closest to the proposed device is a periodic gas-lift lifting fluid from the well [2] containing a replacement chamber in the form of an inverted nozzle installed inside the tubing and tubing and an overflow nozzle with a flange forming a cavity in the lower part hydraulically connected to the inside tubing cavity.

 The disadvantage of this device is the hydraulic flow resistance and, consequently, the pressure loss during the passage of the main gas stream through the overflow pipe and the cavity that accumulates gas bubbles. In addition, the efficiency of this device decreases with an increase in the proportion of gas in the liquid fuel.

 The technical result of the invention is to increase the efficiency of the device by preventing the accumulation of fluid at the bottom of the well and organizing spontaneous discharge into the gas stream.

 The specified technical result is achieved by the fact that a chamber is formed in the tubing string made in the form of a cylindrical pipe and a pipe located in it according to the “pipe in pipe” principle, connected at the bottom by a sealing ring. The pipe in the upper part is equipped with bends in the form of vertical bent pipes placed in the cavity formed by the pipe and pipe, the ends of which are left open.

 A significant difference of the proposed device in comparison with the prototype is that due to the design, i.e. fluid accumulation chambers, formation of a liquid column at the bottom is prevented. In addition, with an increase in the amount of fluid in the wellbore, the core mode spontaneously changes to gas-lift mode. Therefore, the claimed technical solution meets the criteria of the invention of "novelty."

 When viewing similar technical solutions, the claimed combination of essential features, allowing to achieve a technical result, is not found, which gives reason to consider the claimed technical solution as meeting the criteria of the invention "inventive step".

 The drawing shows a device for removing fluid from gas and gas condensate wells, a longitudinal section.

The device consists of tubing 1, in which the working pipe 2 is coaxially placed on the principle of "pipe in pipe". The upper part 2 is equipped with a vertical pipe elbows 3, the upper ends of which are fixed by welding or threaded at an angle ^of 60 to the nozzle 2 through the through holes 9 and serve to connect the chamber 4 with the gas flow moving along the tubing 1. The chamber 4 is sealed from the bottom ring 5. The lower part of the device is fixed to the tubing 1 with stoppers 6 located asymmetrically. The upper end of the pipe 2 is equipped with guides 8 and is mounted on three bosses 7, which act as spacers between the working pipe 2 and tubing 1. The stops 6 and boss 7 are fixed by welding. Ring 5 is attached to the working pipe 2 by means of a weld along the entire perimeter. To ensure sealing of the landing section between the ring 5 and the tubing 1, an epoxy resin with a hardener is used.

 The device operates as follows.

 The liquid flowing along the walls of the tubing 1 enters the chamber 4, accumulates there until the level of hole 9 is reached, and is carried out into the gas stream through the tubes 3 due to the siphon effect. Then there is an accumulation of a new portion of liquid. If the energy of the gas stream is not enough for the removal of fluid and it hangs in it, then there comes a time when the amount of fluid in the wellbore is more critical to the existence of the core mode. In this case, the well spontaneously switches to a gas-lift supply of a gas-liquid mixture to the surface, in order to prevent part of the liquid from draining along the inner wall of the pipe 2 through the hole 9, a small section of the pipe 2 is coated with a heat-resistant material with hydrophobic properties. This contributes to the formation of not liquid layer, but liquid droplets, which are easily carried away by the main gas stream. As a material forming a hydrophobic surface, furfural-furanourea resin may be recommended.

 A watered gas or gas condensate well may be equipped with one device for removing liquid, necessarily at the bottom or several located at a distance of 700.1000 m from each other, starting from the bottom of the well.

Example of use of the device watered gas well, characterized by the following parameters: gas flow rate q _g 550 thousand ^m3 / day, water flow rate q _{in the} 2.1 m ³ / day, the formation pressure P _mp 130 atm wellhead pressure P _at 80 atm. wellhead temperature T _at 353 K, bottomhole temperature T ₃ 377 K, tubing diameter d _tubing 0.1 m, water density ρ _at 1076 kg / m ³ , well depth h 2502 m, critical pressure P _cr 46.9 atm, critical temperature T _cr 192.91 K. With these parameters, the well worked for 50 days. During this time, a column of fluid accumulated with a height of 243.8 m, as a result of which the bottomhole pressure increased to 131.6 atm and the well self-pressed. The total amount of gas produced during this time amounted to 21157 thousand · m ³ . To restore the operation of the well, it is necessary to carry out repair work related to the release of a large amount of gas into the atmosphere with absolutely free flow rate for 2-3 days.

The well was equipped with the proposed device installed on the bottom, worked 572 days before self-jamming. During this time, 303,277.4 thousand m ^{3 of} gas was produced. To avoid self-jamming, it is necessary to install two more devices at a distance of 700 and 1400 m from the first.

 The advantage of operating gas and gas condensate wells using the proposed device compared to the basic method of operating waterlogged wells is to increase gas production by preventing well shutdowns for purging, the life of the well and the overhaul period.

Claims (1)

 DEVICE FOR REMOVING LIQUID FROM GAS AND GAS-CONDENSATE WELLS, comprising a nozzle installed in a tubing string and an annular chamber open at the top, characterized in that it is equipped with taps and a sealing ring, an annular chamber open at the top is formed by a nozzle, a tubing and compression tubing the ring connecting the lower part of the pipe with the tubing string, while the bends are made in the form of vertical bent pipes placed in the annular cavity chambers and the upper ends secured in the top of the nozzle.

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