Patent EA-000928-B1 (EA)
Title: Removing a waste component from a hydrocarbon fluid
Inventor: DASKOPOULOS PHAIDON
IPC: E21B41/00
Filed: 1998-03-13
Abstract: 1. A method of reducing an amount of a waste component present in a hydrocarbon fluid produced from an earth formation via a wellbore formed in the earth formation, the hydrocarbon fluid flowing in a stream of fluid through the wellbore: the method comprising a) inducing at least part of the amount of the waste component to move into a second fluid present in the stream of fluid as said stream flows through the wellbore; and b) separating the second fluid with said at least part of the amount of the waste component included therein, from the hydrocarbon fluid by i) selecting a substance which reacts with the waste component to form a reaction product which is soluble in the second fluid; and by ii) inducing the selected substance to be present in said stream of fluid in the wellbore, whereby said substance reacts with the waste component and the reaction product substantially dissolves in the second fluid and wherein step b) comprises separating the second fluid with the waste component dissolved therein from the hydrocarbon fluid. 2. The method of claim 1, wherein the waste component comprises at least one of H2S and CO2. 3. The method of claim 1 or 2, wherein step ii) comprises inducing the substance to be present in a lower part of the wellbore where the hydrocarbon fluid enters the wellbore. 4. The method of any one of claim 1-3, wherein the waste component comprises at least one of H2S and CO2, and wherein said substance includes OH<-> ions, the reaction product including at least one of the group of HS<->, S<2->, HCO3-- and CO3<2-> ions. 5. The method of claim 4, wherein the OH<-> ions are formed by at least one of the steps of injecting a base into the stream of fluid, and electrolysis of the second fluid. 6. The method of claim 7, wherein said substance is injected into the stream of fluid in the wellbore via a conduit extending into the wellbore. 7. The method of any one of claims 1-6, wherein the second fluid is production water produced simultaneously with the hydrocarbon fluid from the earth formation via said wellbore. 8. The method of claim 7 when dependent on claim 4, wherein prior to inducing said substance to be present in the stream of fluid, part of the production water is separated from the stream of fluid, whereby said reaction product substantially dissolves in the remaining part of the production water. 9. The method of any one of claims 1-8, wherein the second fluid is inserted in the stream of fluid by injecting it into the stream of fluid via the wellbore. 10. The method of claim 9, wherein said substance is dissolved in the second fluid, the second fluid with the dissolved substance being injected into the stream of fluid. 11. The method of claim 9 or 10, wherein prior to injecting the second fluid into the stream of fluid the second fluid is made substantially free of scale-forming components.  12. The method of any one of claims 1-11, further comprising after step b), removing the waste component from the second fluid. 13. The method of claim 12, wherein a selected compound is added to the second fluid which reacts with the waste component so as to form a precipitate which includes the waste component, whereafter the precipitate is removed from the second fluid. 14. The method of any one of claims 1-11, comprising the further step of disposing the second fluid with said waste component included therein by injecting it into the earth formation via at least one of said wellbore and another wellbore formed in the earth formation. 15. The method of any one of claims 1-14, wherein the step of separating the second fluid with said at least part of the amount of the waste component included therein, from the hydrocarbon fluid, is carried out in the wellbore. 16. The method of any one of claim 1-17, wherein the second fluid comprises water.