Methods for reducing condensation
A method for reducing condensate in a subsurface formation is disclosed. The method comprises introducing a first reactant and a second reactant into the subsurface formation. The first reactant and the second reactant produce an exothermic reaction that increases temperature and pressure in the subsurface formation to greater than a dew point of the condensate. Increasing the temperature and pressure in the subsurface formation to greater than the dew point of the condensate vaporizes, and thereby reduces, condensate in the subsurface formation.
1. A method for reducing condensate in a subsurface formation, the method comprising:
introducing a first reactant and a second reactant into the subsurface formation, wherein the first reactant and the second reactant produce an exothermic reaction that increases temperature and pressure in the subsurface formation to greater than a dew point of the condensate, wherein:
increasing the temperature and pressure in the subsurface formation to greater than the dew point of the condensate vaporizes and thereby reduces condensate in the subsurface formation; and
the exothermic reaction forms microfractures within the subsurface formation, thereby reducing condensate banking formation; and
introducing a buffer solution with the first and second reactants into the subsurface formation, in which the buffer solution comprises at least one of monopotassium phosphate, N-cyclohexyl-2-aminoethanesulfonic acid, and borate.
2. The method of claim 1 , in which introducing the first reactant and the second reactant into the subsurface formation comprises introducing each reactant into the subsurface formation separately.
3. The method of claim 2 , in which introducing the first reactant and the second reactant into the subsurface formation comprises introducing the first reactant into the subsurface formation through coiled tubing and introducing the second reactant into the subsurface formation through an annulus of a wellbore.
4. The method of claim 1 , in which introducing the first reactant and the second reactant into the subsurface formation comprises introducing a mixture comprising the first reactant and the second reactant into the subsurface formation.
5. The method of claim 1 , in which the method further comprises introducing N 2 with the first reactant and the second reactant into the subsurface formation.
6. The method of claim 1 , in which at least one of the first reactant and the second reactant comprises a salt hydrate.
7. The method of claim 1 , in which the first reactant and the second reactant are chosen from the group consisting of MgSO 4 ·7H 2 O, Al 2 SO 4 ·18H 2 O, MgCl 2 ·6H 2 O, CaCl 2 ·2H 2 O, NaNO 2 , and NH 4 Cl.
8. The method of claim 1 , in which the first reactant comprises NaNO 2 and the second reactant comprises NH 4 Cl.
9. The method of claim 1 , in which the pressure ranges from 3,500 psi to 10,000 psi.
10. The method of claim 1 , in which the temperature ranges from 300° F. to 750° F.
11. The method of claim 1 , in which a heat capacity of each reactant is greater than 8,000 J/kg° C.
12. The method of claim 1 , in which the exothermic reaction produces from 100,000 to 200,000 kJ per barrel of total reactant.
13. The method of claim 1 , in which the dew point comprises:
a dew temperature ranging from 100° F. to 300° F.; and
a dew pressure ranging from 1500 psi to 4000 psi.