Breaking pumpable hydrocarbon gels
Where the loss of volatile organics during storage of high gravity oil is minimized by forming a flowable or pumpable gel in the high gravity oil, (and/or condensates and distillates), as they are introduced to a storage vessel, the gel is broken by the addition of a small amount of an amine/formaldehyde reaction product, which may be either a triazine or a mixture of non-triazine reaction products. The previously gelled hydrocarbon may then by more readily moved by draining or pumping into a pipeline.
1. Method of dispensing a weakly gelled hydrocarbon fluid from a vessel, said weakly gelled hydrocarbon fluid including a gelled gelling composition comprising a phosphorous-containing gelling component and a polyvalent metal crosslinking component, said method comprising (a) adding to said weakly gelled hydrocarbon fluid an amount of an amine/formaldehyde reaction product effective to break said gelled gelling composition and (b) withdrawing said hydrocarbon fluid from said vessel.
2. Method of claim 1 wherein step (b) is performed by pumping said hydrocarbon fluid from said vessel.
3. Method of claim 1 wherein step (b) is performed by draining said hydrocarbon fluid from said vessel.
4. Method of claim 1 wherein said amine/formaldehyde reaction product comprises a triazine.
5. Method of claim 4 wherein said amine/formaldehyde reaction product comprises S-triazine.
6. Method of claim 1 wherein said weakly gelled hydrocarbon fluid comprises newly produced crude oil.
7. Method of claim 6 wherein said hydrocarbon fluid has an API oil gravity of at least 33°.
8. Method of claim 1 wherein said weakly gelled hydrocarbon fluid comprises condensates from newly produced natural gas.
9. Method of claim 8 wherein said hydrocarbon fluid has an API oil gravity of at least 45°.
10. Method of claim 1 wherein said gelling agent comprises a phosphate-containing gelling component and an aluminum-containing crosslinking component.
11. Method of claim 1 wherein said gelling agent comprises a phosphate-containing gelling component and an iron-containing crosslinking component.
12. Method of claim 1 wherein said amine/formaldehyde reaction product is added at a concentration of 0.01 parts by volume to 2.0% by volume of the hydrocarbon gel.
13. Method of breaking a weakly gelled hydrocarbon fluid having an API oil gravity of at least 33°, said weakly gelled hydrocarbon fluid containing 0.001 to 0.02 parts by volume of a phosphate containing gelling component and 0.001 to 0.02 parts by volume of a polyvalent metal containing crosslinking component, said method comprising adding to said weakly gelled hydrocarbon fluid an amine/formaldehyde reaction product in an amount at least 0.01 parts to 2.0 parts by volume of said weakly gelled hydrocarbon fluid.
14. Method of claim 13 including passing said weakly gelled hydrocarbon fluid containing said amine/formaldehyde reaction product through a pump.
15. Method of claim 14 wherein said amine/formaldehyde reaction product comprises a triazine.
16. Method of transferring a weakly gelled high gravity oil from a storage vessel to a remote destination comprising (a) breaking said weakly gelled high gravity oil by adding thereto 0.01% to 2.0% by volume of the hydrocarbon gel of an amine/formaldehyde reaction product, thereby obtaining a high gravity oil of reduced gel strength, (b) pumping said high gravity oil of reduced gel strength from said storage vessel into a pipe, and (c) transferring said high gravity oil through said pipe to said remote destination, thereby utilizing less energy for said pumping than otherwise would be required.