SU1631640A1 - Borehole-type anode grounding electrode - Google Patents

Abstract

This invention relates to the cathodic protection of underground structures against corrosion and the transmission of direct current through a wire-to-ground system. The goal is to increase the service life and increase the reliability of the earthing, as well as simplify installation and reduce the complexity of its construction. Anode Earthing Contains Bulk Elec

Description

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electrode 1. current lead 4 and tubular electrode 3, located centrally on a dry electrode, made with a perforated tip 5 at the base, placed in a metal grid. The space between the particles of the bulk electrode I, made mainly of ferrosilide, is filled with an electrically conductive hardening solution 2. When constructing the anode earthing after drilling

the wells install a tubular electrode 3, then a bulk electrode 1 is fed into the well, after which the space between its particles is filled with a hardening electrically conductive solution 2 by feeding it into the cavity of the tubular electrode 3 and pumping it under pressure with upward flow from the bottom through the perforated tip. 2 sp, 2 ill.

The invention relates to the cathodic protection of underground structures against corrosion and the transmission of direct current through the wire-to-ground system and can be used for communication pipelines in the oil, gas, and energy industries.

The purpose of the invention is to increase the service life and increase the reliability of the earthing, simplify installation and reduce the complexity of its construction.

Figure 1 shows the downhole anode earthing, longitudinal section; figure 2 - the tip of the tubular electrode, the node I in Fig, 1.

The earthing switch consists of a bulk electrode 1, the particles of which are polyhedra, mainly of ferrosilide, placed in a well. Particles can be of other forms, for example, in the form of spherical granules. The size of particles of ferrosilide should be in the range of 0.1-0.5 borehole diameter (optimally 0.3). The space between ferrosilide particles is filled with solidifying electrically conductive solution 2. A tubular electrode 3 is connected to the center of the well and bulk electrode I, connected to the current lead 4. The tubular electrode 3 is made of an electrically conductive material with a perforated tip 5 at the base. The tip 5 is placed in the metal mesh 6. The tubular electrode 3 is centered with the help of washers 7 located along the well. The upper end of the electrode 3 is connected to the current. input 4 and the power cable 8, Toko input view into the concrete well 9,

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at the bottom of which holes 10 are made. The contact of the electrode 3 with the concrete well 9 is insulated with adhesive insulating tape 11. The entire anode is placed in the well 12. The well 9 is closed with a cover 13 on top and sealed to prevent ingress of groundwater and surface water.

The method of constructing the borehole anode earthing of the proposed construction is carried out as follows.

A wellbore 12 is drilled by a drilling machine in the ground to the design depth and the design diameter (150-J60 mm). The tubular electrode 3 is installed in the well, centered with the help of centralizers - washers 7, without compaction and tamping into the well 12, fill the bulk electrode in the form of crushed ferrosilide particles or obtained by casting and granulation. The conductive solution is supplied by a mortar pump under a pressure of 3-5 aTHfi into the cavity of the tubular electrode 3, from where it is pumped upwardly into the cavities between the bulk ferrosilide electrode particles through the perforated tip 5. The supply of the electrically conductive to the baking solution is performed until it appears in the well 9 through the holes 10 in the bottom. After that, the central tubular electrode 3 is connected through the current lead 4 to the cable 8 and is monolithic molded with an epoxy compound. Cover the well 9 with a lid 13, As the electrically conductive solution using the following plastic composition, weight%:

Carbon material

(graphite) 20-23

Cement 15-17

Sand30-33

Water27-30

The specific electrical resistance of this composition is 0.2 ohm "cm. Both the electrically conductive hardening solution and the ferrosilide particles are insoluble materials with a dissolution rate of 0.2-0.3 kg / A year,

Filling the bulk electrode pores using the upstream method allows you to get a monolithic material in the well without air inclusions, cavities with good adhesion and filling the well walls unevenness, eliminate its settlement over time, ensure uniform solubility over the entire anode earthing earthing. the entire length of the transfer current through the anode into the ground.

Works grounding as follows.

Through the cable 8 from the cathode station, a constant current of rated force and rated voltage is supplied to the current lead 4, which through the tubular electrode 3 is evenly distributed over the depth and passes through the bulk elec- tric, type 1 with an electrically conductive solution 2 and is transmitted to the surrounding ground where it spreads by strata. The use of the present invention in comparison with the prototype makes it possible to increase the service life of the anode earthing due to the tight contact of the electrically conductive medium consisting of two components. low-soluble electrically conductive solution and a poorly soluble ferrosilide bulk electrode, reduce operating costs, as it does not require constant monitoring, filling the bulk electrode and compacting it during operation; to simplify the installation of the anode earthing, as it does not require constant compaction.

dry electrode, cleaning the well, washing it with a solution, water.

Claims (1)

1. A borehole anode earthing, containing a bulk electrode, the particles of which are made in the form of polyhedra or spherical granules of electrically conductive poorly soluble material, and a current lead, characterized in that, in order to increase service life and increase reliability, it is equipped with a tubular electrode connected to the current lead, installed along the longitudinal axis of the bulk electrode, the space between the particles of the bulk electrode is filled with an electrically conductive, slightly soluble hardening substance, with the tubular element trodes are made of perforated tip and mounted thereon with a metal grid, 2, A method of constructing a borehole anode earthing, made in the form of a bulk electrode with a tubular electrode with a perforated tip located along its longitudinal axis and with a metal grid attached to it, consisting in drilling a well, filling it with a bulk electrode and setting up a power supply, characterized by that, in order to simplify installation and reduce labor intensity, after drilling a well, the specified tubular electrode is installed, it is centered, then a bulk electrode is fed into the well, after which transtvo between the particles is filled into the latter solidifying the conductive solution which is pumped 5 into the cavity of the tubular electrode under pressure and which enters the space between the particles of the bulk electrode through the perforated tip of the tubular electrode in 0 as an upstream flow. 0 five 0