Claims
- 1. A method of consolidating an incompetent subterranean formation surrounding a cased wellbore wherein the casing has an intermediate perforated interval opposite said formation which comprises;
- (a) pumping a nonaqueous fluid down said wellbore to displace substantially all of the fluid in said casing below said perforated interval and to force the displaced well fluid into said formation, said nonaqueous fluid having a density greater than said well fluid;
- (b) pumping a preflush solution having a density less than said nonaqueous fluid down said wellbore and into said formation;
- (c) pumping a resinous material having a density less than said nonaqueous fluid down said wellbore and into said formation; and
- (d) allowing said resinous material to harden thereby consolidating a portion of said formation.
- 2. The method of claim 1 wherein said nonaqueous fluid has a density of greater than about 1.05 g/cc.
- 3. The method of claim 2 wherein said nonaqueous fluid has a density of greater than about 1.10 g/cc.
- 4. The method of claim 3 wherein said nonaqueous fluid is substantially free of halogens.
- 5. The method of claim 1 wherein said nonaqueous fluid is miscible with said preflush solution, and immiscible with the fluids contained in said wellbore below said interval.
- 6. The method of claim 5 wherein said nonaqueous liquid is miscible with said solution containing resinous material.
- 7. The method of claim 1 wherein said nonaqueous liquid includes a liquid selected from the group consisting of o-nitrotoluene, carbon disulfide, dimethylphthalate, nitrobenzene, and isoquinoline.
- 8. The method as defined in claim 1 wherein the steps of pumping said nonaqueous fluid, said preflush solution, and said resinous material is performed through said casing.
- 9. In a method for the consolidation of an incompetent subterranean formation surrounding a cased wellbore having an opening therein providing fluid communication between said wellbore and said formation wherein a resinous material is injected into the formation and allowed to harden, said wellbore containing an aqueous, resin-contaminating fluid in a portion of said wellbore below the level of said opening, the improvement which comprises, prior to injecting said resinous material, immiscibly displacing said contaminating fluid from said portion with a nonaqueous fluid which has a density greater than the density of said contaminating fluid and said resinous material to force said resin-contaminating fluid into said formation, thereafter injecting a preflush fluid into said formation which is partially miscible with both the aqueous contaminating fluid and the nonaqueous fluid.
- 10. The method of claim 9 wherein said nonaqueous fluid is miscible with said resinous material.
- 11. The method of claim 9 wherein said nonaqueous fluid has a viscosity of less than about 100 centipoise.
- 12. The method of claim 11 wherein the viscosity of said nonaqueous liquid is less than about 20 centipoise.
- 13. The method of claim 9 wherein said nonaqueous fluid is substantially free of halogenated material.
- 14. A method of consolidating an incompetent formation surrounding a cased wellbore having a perforated interval opposite said formation and containing an aqueous fluid in a lower portion thereof which comprises:
- (a) forcing substantially all of the aqueous fluid from said lower portion of said wellbore and into said formation by introducing a nonaqueous fluid into said wellbore, said nonaqueous fluid being immiscible with said aqueous fluid and having a density greater than said aqueous fluid;
- (b) further displacing said aqueous fluid radially outwardly into said formation by pumping a preflush solution into said formation, said preflush solution being at least partially miscible with both said aqueous fluid and said nonaqueous fluid and having a density less than said nonaqueous fluid;
- (c) pumping into said formation a resin solution which is miscible with said nonaqueous fluid and has a density less than said nonaqueous fluid; and
- (d) permitting said resin to harden such that said formation is consolidated.
- 15. The method of claim 14 wherein said resin solution contains an epoxy resin.
- 16. The method of claim 14 wherein said nonaqueous fluid includes a fluid selected from the group consisting of o-nitrotoluene, carbon disulfide, dimethylphthalate, nitrobenzene, and isoquinoline.
Parent Case Info
This application is a continuation of application Ser. No. 814,009, filed July 8, 1977, now abandoned.
US Referenced Citations (12)
Non-Patent Literature Citations (2)
Entry |
Hong, K. C. et al., "Injection Profile Effects Due to Gravity Segregation in the Wellbore", SPE Paper No. 6129, Society of Petroleum Engineers of AIME, Copyright 1976. |
Richardson, E. A. et al., "Consolidation of Silty Sands with an Epoxy Resin Overflush Process", Sep. 1970, Journal of Petroleum Technology, pp. 1103-1108. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
814009 |
Jul 1977 |
|