CS257397B1

CS257397B1 - A method of protecting the casing of geothermal wells from hydrogen sulfide corrosion

Info

Publication number: CS257397B1
Application number: CS8610207A
Authority: CS
Inventors: Konstantin Vika
Original assignee: Konstantin Vika
Priority date: 1986-12-30
Filing date: 1986-12-30
Publication date: 1988-04-15
Also published as: CS1020786A1

Abstract

Do geotremálneho vrtu sa dávkuje vzduchom presýtená voda spolu so sadzami alebo jemne mletým aktívnym uhlím. Po zmiešaní s geotermálnou vodou sa oxidáciou sírovodíka kyslíkom za přítomnosti uhlíka ako katalyzátora vytvára koloidná síra a jej zlúčeniny, ktoré sa na povrchu oddefujú od geotermálnej vody sedimentáciou a filtráciou. Sposob umožňuje čerpanie zdrojov geotermálnych vod obsahujúcich sirovodík, nakofko tieto zdroje neboli doteraz pre nebezpečenstvo sírovodíkovej korózie pažníc geotermálnych vrtov využívané a zároveň rieši i zneškodněme vznikajúcich termálnych odpadových vod obsahujúcich sirovodík, ktoré sú vysoko toxické pre faunu povrchových tokov — recipientov, do ktorých sa termálně odpadové vody v prevažnej miere vypúšťajú.Air-saturated water is fed into the geothermal well together with carbon black or finely ground activated carbon. After mixing with geothermal water, the oxidation of hydrogen sulfide with oxygen in the presence of carbon as a catalyst creates colloidal sulfur and its compounds, which are separated from the geothermal water on the surface by sedimentation and filtration. The method enables the pumping of geothermal water sources containing hydrogen sulfide, since these sources have not been used so far due to the risk of hydrogen sulfide corrosion of geothermal well casings, and at the same time it also solves the problem of disposing of thermal wastewater containing hydrogen sulfide, which is highly toxic to the fauna of surface streams - recipients into which thermal wastewater is mainly discharged.

Description

Vynález sa týká sposobu ochrany pažnice geotermálneho vrtu před sirovodíkovou koróziou.The present invention relates to a method for protecting the casing of a geothermal well from hydrogen sulfide.

Pri využívaní geotermálnych vod, ktoré obsahujú sirovodík dochádza k sírovodíkovej korózii pažnice geotermálneho vrtu, čo má za následok jeho velmi krátku životnost. V súčasnosti sa pažnice geotermálneho vrtu chránia před sirovodíkovou koróziou například katodovou ochranou, nanášaním ochranných náterov a vrstiev na pažnice, výrobu pažníc z vysoko kvalitných špeciálnych ocelí a kovových materiálov, dávkováním oxidačných činidiel (FeCl3 . 6 H2O, H2O2, KMnO/J do vrtu na oxidáciu sírovodíka a podobné.In the use of geothermal waters that contain hydrogen sulfide, hydrogen sulfide corrosion of the casing of the geothermal borehole results in its very short life. At present, casing of geothermal borehole is protected against hydrogen sulphide corrosion, for example by cathodic protection, by application of protective coatings and layers on casing, production of casings from high quality special steels and metal materials, by dosing of oxidizing agents (FeCl3. hydrogenation of hydrogen sulfide and the like.

Uvedené postupy majú popři svojich výhodách i niekolko nevýhod spočívajúcich například v nárokoch na elektrická energiu pri katodickej ochraně, ako i s uchytením anódy v geotermálnom vrte pri velkých hlbkach úsekov ochrany pažnice, pri použití dávkovania oxidačných činidiel v nárokoch často na vel'ké množstvá chemikálií a v niektorých prípadoch i na ich vy-In addition to their advantages, these processes have several drawbacks, for example, in terms of electrical energy requirements for cathodic protection, as well as the attachment of anode in geothermal wells at large depths of casing protection sections, often using large amounts of chemicals in the claims of oxidizing agents. in some cases their

Claims

SUBJECT A method of protecting the casing of a geothermal well from hydrogen sulphide by oxidizing hydrogen sulphide with atmospheric oxygen, in the presence of carbon as a catalyst for the process to colloidal sulfur and its compounds, characterized in that the geothermal well is priced at high cost with the use of high quality metal materials and special steels, problems and high costs of applying protective coatings and coatings and the need for their restoration and the like. The drawbacks of the described processes are largely eliminated by the method of protecting the casing of the geothermal borehole from hydrogen sulfide by oxidizing the hydrogen sulfide with air oxygen in the presence of carbon as a catalyst for the colloidal sulfur process and its compounds of the invention. The invention is based on the fact that air-saturated water is fed into the geothermal well together with carbon black or finely divided active carbon, and colloidal sulfur is formed and its compounds are removed from the geothermal water by sedimentation and filtration. The method of protecting the casings of the geothermal well according to the invention is not demanding to dispense large quantities in some cases of expensive chemicals and does not require complex technological equipment. YNALEZ is air-saturated with carbon black or finely ground charcoal, and colloidal sulfur is formed and its compounds are separated from the geothermal water by sedimentation and filtration.