CS257396B1 - The way to protect the casing of geothermal borehole against hydrogen sulphide corrosion - Google Patents
The way to protect the casing of geothermal borehole against hydrogen sulphide corrosion Download PDFInfo
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- CS257396B1 CS257396B1 CS1020686A CS1020686A CS257396B1 CS 257396 B1 CS257396 B1 CS 257396B1 CS 1020686 A CS1020686 A CS 1020686A CS 1020686 A CS1020686 A CS 1020686A CS 257396 B1 CS257396 B1 CS 257396B1
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- geothermal
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- hydrogen sulphide
- sulfur dioxide
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Abstract
Oxid siřičitý sa zmiešava s vodou a vo formě kyseliny siričitej sa potom dávkuje do vrtu, kde sa zmiešava s geotermálnou vodou. Vznikajúca koloidná síra a jej zlú- čeniny sa od geotermálnej vody na povrchu oddelujú sedimentáciou a filtráciou. Po vysušení sa z časti, pre zachovanie cyklič nosti procesu, používajú na výrobu oxidu siřičitého. Spósob umožňuje využívanie i doteraz často nevyužívaných geotermálnych vód obsahujúcich sirovodík, nakolko spó- sobovali sírovodíkovú koróziu pažníc a zá roveň by pósobili vysoko toxicky na faunu povrchových tokov — recipientov, do ktorých sa geotermálne vody po využití převážné vypúšťajú.Sulfur dioxide is mixed with water and in the form of sulfuric acid is then dosed into the well, where it is mixed with geothermal water. The resulting colloidal sulfur and its compounds are separated from the geothermal water on the surface by sedimentation and filtration. After drying, part of it, in order to maintain the cyclical nature of the process, is used to produce sulfur dioxide. The method allows the use of geothermal waters containing hydrogen sulfide, which have not been used so far, as they would cause hydrogen sulfide corrosion of the casings and would also have a highly toxic effect on the fauna of surface streams - recipients into which geothermal waters are mostly discharged after use.
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 karóziou například katodovou ochranou, nanášaním ochranných náterov a vrstiev na pažnice, výrobu pažníc z vysoko kvalitných špeciálnych ocelí a kovových materiálov, dávkováním oxidačných činidiel (FeCl3 . 6H2O, H2iO2, KMnOí) 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. Nowadays, casing of geothermal borehole is protected from hydrogen sulphide by for example cathodic protection, application of protective coatings and layers on casing, production of casings from high quality special steels and metal materials, dosing of oxidizing agents (FeCl3. 6H2O, H2iO2, KMnOi) into the borehole for oxidation of hydrogen sulphide etc.
Uvedené postupy majú popři svojich výhodách i niekoiko nevýhod spočívajúcich například v nárokoch na elektrická energiu pri katodickej ochraně, ako i s uchytením anody v geotermálnom vrte pri velkých híbkach úsekov ochrany pažnice, pri použití dávkovania oxidačných činidiel v nárokoch často na velké množstvá chemikálií a v niektorých prípadoch i na ich vysokú cenu, vo vysokých nákladoch pri nutnom použití vysoko kvalitných kovových materiálov a špeciálnych ocelí, v problémoch a vysokých nákladoch na aplikáciu ochranných povlakov a náterov a potřeba ich obnovy a podobné.In addition to their advantages, these processes have several drawbacks, for example, in terms of electricity requirements for cathodic protection, as well as the attachment of the anode in a geothermal well at large casing protection sections, often using large amounts of chemicals and in some cases and their high cost, the high cost of using 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.
Nedostatky popísaných postupov do značnej miery odstraňuje sposob ochrany pažnice geotermálneho vrtu před sirovodíkovou koróziou oxidáciou sírovodíka kyselinou siřičitou na koloidnú síru a jej zlúčeniny podía vynálezu.The disadvantages of the described processes are largely eliminated by the method of protecting the casing of the geothermal borehole from hydrogen sulphide by oxidation of hydrogen sulfide with sulfuric acid to colloidal sulfur and its compounds according to the invention.
Podstata vynálezu spočívá v tom, že sa najprv oxid siřičitý zmiešava s vodou a vo formě kyseliny siričitej sa potom dávkuje do vrtu, kde sa zmiešava s geotermálnou vodou. Vznikajúca koloidná síra a jej zlúčeniny sa od geotermálnej vody na povrchu oddelujú sedimentáciou a filtráciou a po vysušení sa z časti pre zachovanie cykličnosti procesu používajú na výrobu oxidu siřičitého. Výhodou uvedeného sposobu je, že vyrábaný oxid siřičitý sa može před dávkováním do geotermálneho vrtu miešať i s odobratou geotermálnou vodou.SUMMARY OF THE INVENTION The present invention is based on the fact that the sulfur dioxide is first mixed with water and then metered in the form of sulfuric acid into a borehole where it is mixed with geothermal water. The resulting colloidal sulfur and its compounds are separated from the geothermal water on the surface by sedimentation and filtration and, after drying, are used to produce sulfur dioxide in order to maintain the cyclicality of the process. The advantage of this method is that the sulfur dioxide produced can also be mixed with the geothermal water removed before being fed into the geothermal well.
Sposob ochrany pažníc geotermálneho vrtu podlá vynálezu nevyžaduje nákup chemikálií ani zložité technologické zariadenie.The method of protecting the casings of the geothermal well according to the invention does not require the purchase of chemicals or complex technological equipment.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS1020686A CS257396B1 (en) | 1986-12-30 | 1986-12-30 | The way to protect the casing of geothermal borehole against hydrogen sulphide corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS1020686A CS257396B1 (en) | 1986-12-30 | 1986-12-30 | The way to protect the casing of geothermal borehole against hydrogen sulphide corrosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS257396B1 true CS257396B1 (en) | 1988-04-15 |
Family
ID=5448318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS1020686A CS257396B1 (en) | 1986-12-30 | 1986-12-30 | The way to protect the casing of geothermal borehole against hydrogen sulphide corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS257396B1 (en) |
-
1986
- 1986-12-30 CS CS1020686A patent/CS257396B1/en unknown
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