RU2357070C1 - Method of oil production - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method of oil production consists in supply of reagent into flow string via channel of immersed pump with back valve at outlet. At forced shut off of the immersed pump production of oil is continued by creating counter pressure of reservoir fluid in the flow string via the channels of the immersed pump with the back valve at the outlet by means of pumping hot aerated liquid into annular space of the well.

EFFECT: increased efficiency of oil production.

1 dwg

Description

The invention relates to the oil industry, more specifically to methods of oil production.

A known method of oil production, including the supply of a chemical to the tubing through the channels of a submersible pump with a check valve at the outlet (see RU application for invention No. 2004114932 A, E21B 37/06, E21B 41/02 for “Method for supplying reagent to the well” publ. 2005.10.27).

According to its characteristics and the achieved result, this method is the closest to the claimed and adopted as a prototype.

In this method of production, the chemical agent is dispensed by a metering pump to a submersible pump, which is sucked in together with the formation fluid, and then pumped into tubing pipes through the channels of the submersible pump with a check valve at the outlet.

The back pressure of the reservoir fluid in the tubing with this method is created through a check valve by the pressure of the reservoir fluid injected by the submersible pump.

The disadvantage of this production method is its low efficiency due to long-term interruptions in the production process during forced shutdowns of the submersible pump, for example, when repairing its ground equipment, and intensive salt, asphalt-resin-paraffin deposits and corrosion products, while in the elements of the well, which significantly reduce the production efficiency when it is resumed .

The objective of the invention is to increase the efficiency of oil production.

This problem is solved by improving the method of oil production, including the supply of a chemical to the tubing through the channels of a submersible pump with a check valve at the outlet.

The improvement consists in the fact that when the submersible pump is forced to turn off, oil production is continued by creating backpressure of the formation fluid in the tubing through the channels of the submersible pump with a non-return valve at the outlet by a gas lift or other known method, for example, pumping aerated fluid; backpressure of the reservoir fluid in the tubing through the channels of the submersible pump with a check valve creates the injection of hot aerated fluid into the annulus of the well.

Continued oil production during forced shutdown of the submersible pump by creating backpressure of the reservoir fluid in the tubing through the channels of the submersible pump with a non-return valve at the outlet by a gas lift or other known method allows eliminating well shutdowns when the submersible pump is turned off and enhanced salt, asphalt-resin-paraffin deposits and the accumulation of corrosion products in her and thereby increase the efficiency of oil production.

The creation of backpressure of the reservoir fluid in the tubing through the channels of the submersible pump with a non-return valve by pumping hot aerated fluid into the annulus provides improved removal of saline, asphalt-resin-paraffin deposits and corrosion products.

Below, with reference to the attached drawing, describes the proposed method.

The method of oil production includes the supply of chemical agent 1 to the tubing 2 through the channels 3 of the submersible pump 4 with a check valve 5 at the outlet of the submersible pump 4 into the tubing 2.

In case of a forced shutdown of the submersible pump 4 (for example, when repairing ground equipment), oil production is continued by creating backpressure of the reservoir fluid in the tubing 2 through the channels 3 of the submersible pump 4 with a check valve 5 with a gas lift, i.e. injection into the annular space 6 of gas (air) 7 or another known method, for example, injection into the annular space 6 of aerated fluid 8, which with the chemical reagent 1 and the reservoir fluid of the well pass through the channels 3 of the disconnected submersible pump 4, raising the check valve 5, enter the pump -compressor pipes 2 and move along them to the wellhead (which reduces the forced downtime of the well and reduces salt, asphalt-tar and paraffin deposits and corrosion products in it).

In an embodiment of the method, backpressure of the formation fluid in the tubing 2 through the channels 3 of the submersible pump 4 is created by injection into the annulus 6 hot, for example, with a temperature> 35 ° C of aerated fluid 9 (which together with the chemical agent provides improved removal of the above deposits and corrosion products).

The method of oil production according to the invention, due to the continuation of production with the submersible pump switched off and the reduction of salt, asphalt-resin-paraffin deposits and corrosion in the well elements, is characterized by greater efficiency compared to the prototype.

Claims (1)

The method of oil production, including the supply of a chemical to the tubing through the channels of a submersible pump with a check valve at the outlet, characterized in that when the submersible pump is forced to turn off, oil production is continued by creating back pressure of the formation fluid in the tubing through the channels of the submersible pump with a check valve at the exit by injection of hot aerated fluid into the annulus of the well.