SU817221A2

SU817221A2 - Gas well blasting apparatus

Info

Publication number: SU817221A2
Application number: SU792724213A
Authority: SU
Inventors: Эдуард Брониславович Кузнецов; Вячеслав Владимирович Клеветов; Станислав Афанасьевич Алехин
Original assignee: Среднеазиатский Научно-Исследовательскийинститут Природного Газа
Priority date: 1979-02-14
Filing date: 1979-02-14
Publication date: 1981-03-30

Description

(54) УСТРОЙСТВО ДЛЯ ПРОДУВКИ ГАЗОВОЙ СКВАЖИНЫ(54) DEVICE FOR BLOWING GAS WELL

II

Изобретение относитс к нефтегазодобывающей промышленности, а именно к оборудованию дли оснащени газовых скважин, эксплуатируемых в услови х накоплени жидкости на забое.The invention relates to the oil and gas industry, namely, equipment for equipping gas wells operated under conditions of accumulation of liquid at the bottomhole.

По основному авт. св. № 709802 известно устройство дл продувки газовой скважины, состо щее из установленного на фланце продувочной линии цилиндра с окнами, сообщающегос с полостью насосно-компрессорных труб, в котором размещен полый подпружиненный плунжер с радиальными каналами, образующий с цилиндром полость с выполненными в цилиндре на разных уровн х радиальными каналами, а в верхней части плунжера выполнены продольные каналы с кольцевой проточкой, сообщающими в верхнем положении плунжера полость цилиндра с затрубным пространством, а в нижнем положении - полость цилиндра с продувочной линией 1.According to the main author. St. No. 709802, there is known a device for purging a gas well consisting of a cylinder with windows installed on the flange, communicating with the tubing cavity with a hollow spring-loaded plunger with radial channels forming a cavity with cylinders made in the cylinder at different levels x radial channels, and in the upper part of the plunger there are made longitudinal channels with an annular groove, communicating in the upper position of the plunger the cavity of the cylinder with the annular space, and in the lower position and - cylinder cavity with purge line 1.

Дл возвращени плунжера в верхнее положение последний снабжен пружиной, котора должна запастись энергией при ходе плунжера вниз, достаточной дл выталкивани его в верхнее положение после окончани продувки. На аккумулирование энергииTo return the plunger to the upper position, the latter is provided with a spring, which must be stored with energy when the plunger moves down sufficiently to push it to the upper position after the end of the purge. Energy storage

пружиной необходим достаточный перепад давлени между затрубным и трубным пространством скважины. Это снижает чувствительность устройства, что приводит к увеличению количества накапливаемой жидкости на забое скважины, и дл ее удалени требуетс более длительна продувка скважины .the spring requires a sufficient pressure drop between the annulus and the tube space of the well. This reduces the sensitivity of the device, which leads to an increase in the amount of accumulated fluid at the bottom of the well, and to remove it requires a longer well purge.

Цель изобретени - повышение надежности его работы и повышение чувствительности его срабатывани .The purpose of the invention is to increase the reliability of its operation and increase the sensitivity of its operation.

Поставленна цель достигаетс тем, что плунжер имеет в нижней части кольцевой выступ с каналами, образующий с цилиндром верхнюю камеру, сообщающуюс с продувочной линией, и нижнюю, сообщающуюс через каналы выступа плунжера с продувочной линией при верхнем положении плунжера и с затрубным пространством при нижнем его положении.The goal is achieved in that in the lower part the plunger has an annular protrusion with channels forming the upper chamber in communication with the cylinder, and the lower one communicating through the protrusion channels of the plunger with the purge line at the upper position of the plunger and in the annular space at its lower position .

На чертеже представлена схема предложенного устройства в разрезе.The drawing shows a diagram of the proposed device in section.

Claims

The device consists of a cylinder 1 in which a hollow plunger 2 is placed, the lower part of which has an annular protrusion 3, the plunger 2 fits into the cylinder and is sealed with rings 4. In the upper part of the plunger an annular groove 5 is made and channels b that connect the groove 5 with the cavity of cylinder 1 above the plunger 2. Plunger 2 has radial channels 7, and a slotter 8 is installed in the wall of cylinder 1. Cylinder 1 has windows 9. An annular protrusion forms an upper cavity 10 with a cylinder, which communicates with a cylinder bore 11 with a purge line. An annular groove 12 is formed in the annular protrusion 3 and communicates with the longitudinal channels 13. The differential piston 3 of the plunger 2B is fitted to the piston space 10 of the cylinder with rings 14. An opening 15 is also made in the wall of the cylinder 1 and communicates with the annulus gas 16 wells also communicated with the groove 5. Cylinder 1 is screwed onto flange 17 and fixed with a lock nut 18. Hole 9 and shtutser 8 are connected to a purge line 19, equipped with a drain valve 20. And the line 16 of the annular space is equipped with p An adjustment valve 21. In the cavity of cylinder 1, a stop ring 22 is also installed, which determines the position of the plunger.

2. The device is mounted with the flange 17 on the buffer valve of the wellhead, the line 16 is connected to the well annulus, and the blow line is connected to the flare line of the well. During operation of the well, the cavity of the cylinder 1 through the annular groove 5 and the channels 6 and line 16 communicates with the annulus of the well. The annular groove 13 communicates with the purge line and the lower chamber 23 of the protrusion 3, and the cavity of the plunger 2 communicates with the space of pump-compressor pipes. The resulting pressure drop during the operation of the well between the tube and the annulus is compensated for by friction in conjunction. When fluid accumulates in the wellbore, wellhead pressure in the tube space will begin to decrease at almost constant pressure in the annulus, which will cause an increase in pressure difference between the tube and bubble space, which, acting on the plunger 2, will cause it to move to its lowest position. In this case, the groove 5 will communicate with the clamp 8, and the radial holes 7 of the plunger 2 will align with the holes 9, and the groove 12 of the protrusion of the plunger 3 will align with the hole 15 communicated with the line 16 of the annular space, and in the lower chamber 23 under the annular ledge behind the account of its communication through the channels 13 and the groove 12 with the hole 15 will begin to increase pressure. In the meantime, the well will be blown through apertures 7 and 9 and a purge line 19 to the flare line of the well. The purge time is determined by the time it takes for the gas to bleed through the cavity of cylinder 1 above plunger 2 through channels 6, ring bore 5 and shtutser 8. When a certain pressure is reached in this cavity, proportional to the difference in area of plunger 2 and ring lug 3, the piston well pressure acting on the bottom of the protrusion 3 will move the plunger 2 to the upper position, in which the lower chamber 23 communicates with the purge line. The blowing of the well stops and it goes into operation. Thus, the switching of the protrusion 3 of the plunger 2 to the lower and upper positions occurs directly under the action of the pressure of the annulus of the well without an intermediate energy storage, as a result of which the sensitivity of the device is greatly increased. Apparatus of the Invention A device for blowing a gas well according to the author. St. No. 709802, characterized in that, in order to increase the reliability of its operation, the plunger has an annular channel protrusion in the lower part, forming with the cylinder an upper chamber communicating with the purge line, and lower communicating through the protrusion channels of the plunger with the purge line with the upper position the plunger and annulus with its lower position. Sources of information taken into account in the examination 1. USSR author's certificate No. 709802, cl. E 21 B 43/00, 04/28/76.