RU2079636C1 - Gas vent from annular space - Google Patents

Abstract

FIELD: oil and gas producing industry. SUBSTANCE: electrical centrifugal pump consists of downhole motor 1, hydroprotection 2, pump 3. Pump discharge is made in form of ejector device which includes nozzle 4, mixing chamber 5, diffuser 6. Motor is supplied through cable 7. Channel 8 for bypassing the gas from annular space 9 is made at the level of mixing chamber 5. The channel is provided with check valve 10. During operation of pump 3, the produced fluid is directed through nozzle 4 to create rarefaction in the region of mixing chamber 5 and to cause valve 10 open and to bypass the gas from annular space 9 to mixing chamber. Gas becomes mixed with produced fluid and enters diffuser 6 and further on to wellhead. EFFECT: higher efficiency. 1 dwg

Description

 The invention relates to the oil industry, in particular to the field of oil production from wells by electric centrifugal pumps.

 A known method of discharging gas from the annulus into the atmosphere by periodically opening the valve at the wellhead as accumulation and pressure increase to a critical value.

 This method has the following disadvantages.

 1. The creation of gas contamination of the atmosphere and the associated fire and environmental hazards.

 2. The need to attract workers to control pressure and to discharge gas due to a lack of necessary technical means.

 Closest to the claimed is a method of operating a young well by periodically accumulating fluid in the sump and pumping it out.

 This method has the following disadvantages.

 1. The method is applicable only to low production wells.

 2. Pumping liquid is carried out periodically.

 3. To accumulate fluid, the well must be equipped with a sump.

 4. In the annulus, a pressure equal to the saturation pressure is maintained.

 The aim of the invention is a method of discharging gas from the annulus, characterized by greater efficiency due to continuous forced pumping. This goal is achieved by the fact that in the tubing creates an area of reduced pressure compared to the annular space of the well by applying an ejector device to the ESP outlet and communicating the annular space with the tubing cavity in the region of the mixing chamber of the ejector device.

 The drawing shows a diagram of the method.

 The discharge of the installation of the electric centrifugal pump, consisting of a submersible motor 1, hydraulic protection 2, pump 3, is equipped with an ejector device. It includes a nozzle 4, a mixing chamber 5, a diffuser 6. The voltage to the engine is supplied via cable 7. At the level of the mixing chamber 5, a channel 8 is provided for passing gas from the annulus 9, equipped with a check valve 10.

 When the pump 3 is in operation, the produced fluid is directed through the nozzle 4, creating a vacuum in the region of the mixing chamber 5, which causes the valve 10 to open and gas bypass from the annulus 9 in the region of the mixing chamber, which, mixed with the produced fluid, enters the diffuser 6 and then to the wellhead .

Claims (1)

 A method of discharging gas from the annulus, including creating a pressure in the tubing below the pressure in the annulus and bypassing the gas when the downhole pump is operating from the annulus to the tubing cavity through a channel connecting them and equipped with a check valve, characterized in that the tubing is equipped with an ejector above the depth pump device, a channel for transferring gas from the annulus to the tubing cavity is performed at the level of the location of the displacement chamber of the ejector device, and the produced fluid is sent after exiting yes from the pump through the nozzle of the ejector device into its displacement chamber.