Deep anode ground disk
The invention relates to deep anode grounding and can be used to protect underground pipelines from electrochemical corrosion. We offer earthing contains two concentric spaced steel tubes, the space between which is filled with coke fines, to the inner tube along the entire length of its working parts are welded bilateral welding seam steel wheels at an angle of at least 40oto the horizon, covering the pipe with a diameter providing a clearance between the edge of the disc and the inner surface of the outer pipe not less than 7 maximum size of the largest particles of the coke breeze. The pipes in the form of pre-fabricated mounting sections of length equal to or comparable to the length of the industrial assortment of pipes, gathered together during installation of earthing. The use of the invention will reduce the amount of welding and Assembly works related to the installation of the earthing switch in the hole, a high degree of industrialization of production and the achievement of uniform flowing of the electric current from the ground, its reliability and long service life. 2 Il. The invention relates to the protection of underground pipelines on polozhenie steel pipe, the space between which is filled with coke fines, and to the inner tube along the entire length of its working parts are outside of the fixed steel elements (SU/s 414885, 23 F 13/00) in the form of rods.A disadvantage of the known ground is uneven running off the electric current from the anode earthing, which leads to premature wear of individual sections of the deep anode ground.Closest to the invention to the technical essence and the achieved result is deep anode ground containing two concentrically arranged steel pipe, the space between which is filled with coke fines, and to the inside along the entire length of its working parts are outside of the fixed steel elements in the form of discs, covering pipe (SU/s 852969, 23 F 13/00).This earthing has several disadvantages: - the design of the earthing does not allow the Assembly and mounting it into the well in an industrial way, i.e. from prefabricated at the factory Assembly sections of the inner pipe welded to the disks and the outer pipe of appropriate length with subsequent backfilling the annulus coke detail, because when the backfill under the disks are formed cavity,the morning surface of the outer pipe coke fines due to the arching effect (see A. Century Katalyma, C. A. Lubartowicz "Dispensing granular and viscous materials", Leningrad, Khimiya, 1990), resulting in an in-line space during the working part of the earthing is not filled coke fines. Earthing in both cases will be inoperative to the extent that was intended.In order to avoid such a situation, welded disks and coke breeze backfill must be made sequentially, as the design of the earthing: first you need to fill the coke breeze to a height equal to the distance between the disks, and then to weld the drive to fill the coke breeze and weld on the disk and so forth, but in this case, the length of the outer pipe must not exceed the length of the welding electrode -0,3 m, otherwise unavailable will be welding the disks. Manufacturer of earthing of the pieces of pipe of this length requires a large amount of installation work and the large consumption of welding materials. In addition, the reliability and durability of such ground will be negligible. This statement is well illustrated by comparing the probability of failure-free operation of the outer tube of known earth lead to the end of the requested resource with probability outer whom you weld on the pipe is equal to A== 0,98 (98%). The length of the pipe in the first and second cases is assumed to be 12 m Number of welds on pipe in the first case, taking account of the joints, end caps n1= 12/0,3 - 1+2=41, in the second case, n2==2. The probability of failure of the outer pipe as a whole by reason of failure of the weld, according to theory of probabilities is: in the first case, A1= An1= 0,9841= 0,44(44%), the second A2= An2= 0,982= 0,96(96%). As can be seen from the comparison, in the first case, the reliability of the outer pipe is 2.2 times less than in the second case.- The design of the earthing switch allows only one-sided welding seam between the disk and the inner pipe. The reliability of this connection of the drive pipe is compared with the reliability of connection of the drive pipe bilateral welding seam made in advance with the industrial method of Assembly and installation, 4 times lower, because one-sided stitch, also known as the location of intensive electrochemical corrosion, exposed to the electrolyte ground on both sides, unlike bilateral representing two-sided weld at each separately in the so output, the design of the earthing extremely unreliable and short-lived.An object of the invention is the creation of a deep anode ground disk, which design provides a uniform stream of electric current in the ground, reliable and durable, allows for the fabrication, Assembly and installation of it into the well in an industrial way, when a small amount of welding and Assembly works and saving materials.The technical problem is solved due to the fact that in deep anode ground disk containing two concentric spaced steel tubes, the space between which is filled with coke fines, and to the inner tube along the entire length of its working parts are outside of the fixed steel disks which surround the pipe, according to the invention the tube is made in the form of a pre-manufactured Assembly of pipe sections with a length equal to or comparable to the length of the industrial assortment of pipes, gathered together during installation of earthing and disks secured bilateral welding seam at an angle of at least 40oto the horizon and have a diameter providing a clearance between the edge of the disc and the inner surface of the outer pipe, at least 7 units maximum redstapler on the drawings: Fig.1 - longitudinal section of the earthing switch in the well; Fig. 2 is a diagram illustrating the process of filling the annulus coke fines.Deep anode ground consists of two concentric spaced steel pipes 1 and 2, the space between which is filled with coke fines 3. To the inner pipe 1 is attached at an angle of at least 40oto the horizon steel wheels 4 over the entire length of the working part. Inside the pipe 1 passes the cable 5. The place of connection of the cable 5 to the pipe 1 and the output of the pipe 1 from the pipe 2 is covered with insulation 6. Outer tube 2 on the ends are connected to the mechanical washers 7 and 8 with the pipe 1. The space 9 between the ground and the borehole wall is filled with gravel, sand, broken bricks, etc.,Earthing is collected as follows: in the factory pre-made mounting pipe sections: the outer 2 holes for the passage of gases and internal with 1 welded to the disk 4 at an angle of 90-= 90-40= 50to the axis. Welded drives 4 Osam seam under the influence of electrochemical corrosion. The length of the sections is selected according to the purpose of earthing, comparable with the length supplied by industry, pipe schedules that will allow 2 or more times to increase the reliability of the outer tube 2 under the influence of electrochemical corrosion in comparison with the prototype, with the pipe 2 is welded from lengths of 0.3 m Welding and Assembly of pipe sections 1 and 2, the mechanical washers 7 and 8, the connection cable 5 and the insulation 6 of the pipe 1 and backfilling the annulus coke fines 3 carry out as you descend earthing switch in the hole. The size of the disk 4 is chosen so that the gap "I" between the edge of the disc 4 and the inner surface of the outer tube 2 was not less than 7 maximum dimension dmaxthe largest of the particles 10 coke breeze 3, to avoid the formation of a set of particles 10 and obstruction clearance "I" (see A. C. Katalyma, C. A. Lubartowicz "Dispensing granular and viscous materials", Leningrad, Khimiya, 1990), preventing the penetration of coke breeze 3 annulus.From the above source, it is known that coke breeze 3 refers to incoherent loose materials angle of repose°1= 25is t equal to+°1to ensure the natural shedding of the coke breeze 3 disk 4 on the surface of repose 11. From the top disc 4 is filled with coke fines freely. From°1depends on the size of the bottom surface of the disc 4 is not in contact with the particles 10 coke breeze 3-1 l1= d/sin°1on the reliability and completeness of the electric conductivity between the bottom surface of the disk 4 and coke fines 3. Experiments have shown that when the angle°1= 5-15the conductivity of the contact of the lower surface of the disk 4 with coke fines 3 is equal to the conductivity of the upper surface of the disk 4 with coke fines 3. Thus, the compliance gap 17dmax, the angle of the disc 4 to the horizon35)+(155)40within the required limits, provides backfilling the annulus ground coke fines 3 without voids regardless of the length of the pipes 1 and 2, which guarantees the reliability and the electric conductivity between the disk 4 and coke fines 3, which in turn is a guarantee of reliable and long-term operation of earthing for the entire booked period of its operation.Deep anode ground disk works as follows.Design features of the device: the tilt of the disk 4 to the horizon at an angle of 40oand the gap between the edge of the disk 4 and the inner surface of the pipe 2 over 7 maximum size of the largest particle coke breeze; provides full, without cavities under the disks 4, natural osypanie disks 4 and the tube 1 and the complete filling of the annulus, which, in practice, a reduction of 1.2-1.3 times the resistivity and decrease in 1,3-1,5 times electrochemical equivalent of earthing compared with earthing switch without tilt drive with noncontrolled gap between the edge of the disk and the inner surface of the outer pipe and fill odace electric current on the inner tube 1 around the earth creates an electric field, leading to electrochemical dissolution of the first outer pipe 2, then 4 disks and at least the inner pipe 1.The present invention can be used for protection against electrochemical corrosion of underground steel pipelines with the use of deep anode grounding disk.The use of earthing of the proposed design provides a uniform runoff electric current of earthing, increased service life compared to the prototype, while significantly reducing welding and Assembly works and materials during the installation of the earthing switch in the hole, guaranteed reliability and a high degree of industrialization of production.
ClaimsDeep anode ground disk containing two concentric spaced steel tubes, the space between which is filled with coke fines, to the inner tube along the entire length of its working parts are outside of the fixed steel disks covering the tube, wherein the tube is made in the form of a pre-manufactured Assembly section length equal or comparable to the length of the industrial assortment of pipes, gathered together when installing for Amer, to ensure that the gap between the edge of the disc and the inner surface of the outer pipe not less than 7 maximum size of the largest particle coke breeze.
SUBSTANCE: electrode comprises insulated housing filled with electrolyte, rod mounted inside the housing, potential pickup mounted on the housing and connected with a tip, and ion-exchange diaphragm. The rod is made of silver and represents an electrode. The ion-exchanger diaphragm is pressed to the housing via the sealing spacer by means of clutch provided with perforation. The electrolyte is made of the saturated water solution of a mixture of potassium chloride and ethylene glycol in a ratio of 3:2-2:1.
EFFECT: enhanced reliability.
3 dwg, 1 ex
FIELD: oil and gas industry.
SUBSTANCE: invention refers to cathode protection of flow strings of oil and gas producing wells from underground corrosion. The anode consists of current conductor in a coating on polymer base; also the anode is located in a well between flow and casing strings along the whole length of protected surface of the flow string; in addition, the anode current conductor corresponds to a flexible steel cable made out of corrosion resistant steel in a perforated coating out of elastic heat resistant isolating material; notably, the coating is perforated on all surface along the length of the anode and degree of coating perforation is 10-90%, and growing in proportion to the length of protected surface of the flow string.
EFFECT: development of inexpensive, simple in fabrication and operation anode facilitating high degree of protection of exterior surface of flow strings of well and gas producing wells from corrosion.
SUBSTANCE: invention relates to design of a filter for purifying natural and waste water and can be used in public utilities and on industrial plants. The water filter has a steel housing filled with filter material, a distribution and collecting system for feeding and distributing water, wherein vertical alternating rows are placed inside the steel housing parallel to its walls, said rows being in form of closed loops of electropositive electrodes connected in series by a wire and similarly connected electronegative electrodes, with formation of electrochemical current sources which are provided with voltmeters connected in parallel to load resistors, wherein the first row of electronegative electrodes is connected to the housing of the filter.
EFFECT: high efficiency of purifying water and protection of the metal housing from internal corrosion, as well as obtaining electric power.
3 cl, 2 tbl, 2 ex, 2 dwg
SUBSTANCE: method involves garland assembly of electrodes by means of connection devices, filling of the space between electrodes; mating surfaces of parts of connection device are fixed on threaded ends of electrodes, coated with a layer of current-conducting paste, joint to a fixed coupling by supply of compressed air to the connection device, the external surfaces of which are coated with mastic layer, adhesive tape is wound in 2-3 layers, and closed with cylindrical form with assembly foam. Ground wire includes a garland of electrodes assembled by means of connection devices; at that, connection device includes a coupling, a collet with an expanding head, which are fixed on threaded ends of mating electrodes, a puncheon with a piston and a cone, which is retained in initial position with a shear membrane in a pneumatic chamber, a threaded lock, and a compressed air or gas source. Electrode includes a central bar, a protective cover concentric to it, side bars welded to the central one; at that, cover is formed with a layer of activating agent of cylindrical shape, and side bars envelope the central bar within angle β of not less than 30°.
EFFECT: simpler assembly; higher labour productivity.
3 cl, 7 dwg
SUBSTANCE: multi-layered protective coating is formed on metal surface. First layer is formed from material, capable of interaction with water electrolyte and of changing electroconductivity property. Second layer is formed from hydroinsulating current-conducting material. Electrochemically active composite material, capable of interaction with water electrolyte, reduces its electric resistance in case of contact with water electrolyte and is formed by mixing component A and component B. Hydroinsulating low-resistance material for formation of second and the following layers of protective coating is formed by mixing component A1 and component B1. Coating includes first layer, formed from electrochemically active composite material and, at least, one second layer, formed from hydroinsulating low-resistance material.
EFFECT: possibility to prevent or sharply reduce sub-film corrosion by application of cathode protection.
4 cl, 6 tbl
SUBSTANCE: mineral activating agent contains (% by weight): shungite powder 90-99, water-soluble tertiary amine (pH 8-10) 10-1.
EFFECT: improved electrical performance for protected facilities by stabilising the weight of the activating agent, polarisation potential and transient resistance at the phase boundary of the ground and the activating agent, reduced current-spreading resistance.
3 cl, 2 tbl
SUBSTANCE: invention relates to electrochemical protection of underground metal structures from corrosion. Earthing device comprises a tubular electrode made from material based on magnetite or high-silicon cast iron, current lead and heat shrink sleeve wherein current lead consists of two contact units located at ends of electrode, connected by conductors of current feed cable and consisting of pressed into electrode split bushings with height of 20-40 mm, with outer diameter which is 0.5-2.0 mm smaller than inner diameter of electrode, made with rectangular recesses at diameter with width of 2-4 mm and depth of 1.2 -1.3 times radius of sleeves, wherein at centre of sleeves there are through holes with diameter of 8-12 mm, in which simultaneously with cable conductors are pressed metal inserts of height which is 10-40 mm larger than that of sleeve, diameter of which is less than diameter of opening of sleeve by 0.4-1.5 mm, and on side surfaces of inserts on one side of contact pads in form of flat sections at an angle of 10-12 degrees to central axis, beginning at middle of insert, wherein contact units are filled with fusible solder on tin with thickness up to 12 mm, and cable lead is insulated with silicone sealant.
EFFECT: technical result is longer service life and reduced electric power consumption for cathode protection.
2 cl, 3 dwg
SUBSTANCE: surface anode earth electrode comprised of a cylindrical body containing a gas outlet pipe and a current lead wire placed in a means of protection against damage during bending. Inside the cylindrical body cavity there is a cast electrode and a supporting frame. At the end faces it is provided with locking and fastening covers, upper and lower. The gas outlet tube contains an off-surface, subsurface areas and an area located inside the cylindrical body. A corrugated pipe of polymeric material with higher moisture resistance and impact resistance is used as a means of protection during bending. It is fixed in a hole on the upper locking and fastening cover and has a length of not less than the length of the off-surface and subsurface areas of the gas outlet pipe. A portion of the gas outlet pipe, located inside the cylindrical body, is spirally disposed around the supporting frame and is corrugated.
EFFECT: prevention of damage to the gas outlet pipe and the current lead wire when laying the anode earth electrode, increased effectiveness of gas removal and increased service life of the anode earth electrode.