RU34633U1 - Downhole generator - Google Patents

Description

The utility model relates to the field of oil production using electrochemical, ion-plasma, and electric stimulation technologies.

Known ion-plasma generator (Certificate of the Russian Federation No. 24503, IPC E 21 V 43/24, publ. 08/10/2002), containing a housing in the form of a pipe with holes serving as a cathode, and mounted inside the center of the anode, separated by an insulator . In the interelectrode zone there is an electrolyte, which is used as mineralized water. The internal space of the housing is divided into two chambers by means of a floating piston, and the lower discharge chamber is equipped with separate discharge electrodes.

This ion-plasma generator has the following disadvantages: the volume resistance of the electrolyte with this design is small, in addition, it is the smaller, the higher the density of the electrolyte. The ohmic resistance of the current-supply cable, when the reservoir is below 900 meters, is several times higher than the volume resistance of the electrolyte, which means that the main voltage drop will occur on the cable, hence the low efficiency, the difficulty in selecting the power cable. To power the generator and allocate significant power to it, the use of a special cable of large cross section is required, which in turn requires significant power of the wellhead transformer, that is, its replacement. This increases the cost of well treatments.

Closest to the proposed downhole generator is a downhole ion-plasma generator (Certificate of the Russian Federation No. 14451, IPC E 21 V 43/24, publ. 07.27.2000), containing an electrolyte and electrodes coaxially mounted relative to each other in the form of a cathode and anode, divided between

MPKE21V43 / 24 Well generator

by means of an insulator. The cathode is made in the form of a pipe with holes in which the outlet nozzles are installed, and is equipped with a packer in the upper part.

This borehole ion-plasma generator also has a small volume resistance of the electrolyte, and the ohmic resistance of the current-supply cable, when the reservoir is below 900 meters, is several times higher than the value of the volume resistance of the electrolyte, which means that the main voltage drop will occur on the cable, hence low efficiency , difficulty in selecting a power cable. To power the generator and allocate significant power to it, the use of a special cable of large cross section is required, which in turn requires significant power of the wellhead transformer, that is, its replacement. This increases the cost of well treatments.

The task to be solved by the proposed technical solution is to reduce the energy intensity of the process of exposure to the oil reservoir, simplifying the design of the downhole generator.

The problem is solved by a downhole generator containing an electrolyte and electrodes coaxially mounted relative to each other in the form of a cathode and anode, separated by insulators, and a current lead assembly is fixed at the upper end of the anode, in which, unlike the prototype, an insulating pipe is located between the cathode and anode material, the length of which is selected depending on the density of the electrolyte and the required electrical power of the generator ..

The essence of the utility model is illustrated in the drawing, which shows the design of the downhole generator in the context.

The downhole generator consists of a casing 1 in the form of a pipe, which, together with the casing 2, is a negative cathode electrode. A pipe 3 made of insulating material and a positive electrode-anode 4 are coaxially placed inside the housing in the form of a pipe (or a whitewashing wheel made of rods, or any

another form), having a current lead assembly 5, insulated from the housing by insulators 6. The lower insulator is mounted and rests on the deflector 7. The generator is equipped with a coupling 8 and an adapter 9 for fastening to the string of pump and compressor pipes. The length of the positive electrode is not regulated, and a change in the length of the pipe made of insulating material allows you to change the volume resistance of the electrolyte over a wide range. Sectional assembly of the positive electrode in the generator or series connection of several generators into one node is possible.

The downhole generator can be lowered into the perforation zone of the well on the cable, while the attachment point of the generator to the cable is screwed onto the coupling 8. Mineralized water-electrolyte is supplied through a column of pump and compressor pipes and enters the reaction zone of the generator between the anode and the pipe of insulating material. Electrochemical, electrolytic, ion-plasma processes take place in the reaction zone, intense heating of the electrolyte occurs, a heated, chemically active electrolyte fills the space between the casing and the generator body, flows freely inside the anode and, under pressure, enters the reservoir through openings in the casing.

The main criteria for the effective operation of a downhole generator are: the possibility of incorporating maximum power on it, the possibility of using electrical equipment and cables widely used in the oil industry, and reducing the energy intensity of the technologies used.

The proposed downhole generator is easy to manufacture, allows the use of cables used in the oil industry. The ability to match the resistance of the current-supply cable and the volume resistance of the electrolyte allows you to increase the efficiency of the impact on the reservoir.

Claims (1)

A downhole generator containing an electrolyte and coaxially mounted electrodes relative to each other in the form of a cathode and anode, separated by insulators, with a current lead assembly fixed to the upper end of the anode, characterized in that a pipe of insulating material is located between the cathode and the anode, the length of which is selected depending on the density of the electrolyte and the required electrical power of the generator.