Natural Polymer-Based Compositions Designed for Use in Conformance Gel Systems
- B.R. Reddy (Halliburton Energy Services Group) | Larry S. Eoff (Halliburton Energy Services Group) | E. Dwyann Dalrymple (Halliburton Energy Services Group) | David L. Brown (Halliburton Energy Services Group)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- December 2005
- Document Type
- Journal Paper
- 385 - 393
- 2005. Society of Petroleum Engineers
- 3 Production and Well Operations, 2.4.3 Sand/Solids Control, 1.6.9 Coring, Fishing, 4.2.3 Materials and Corrosion, 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics
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- 545 since 2007
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This article describes a crosslinking material derived from natural sourcesthat can be used with a variety of polymers over a broad temperature range toproduce gels for conformance applications. Delayed crosslinked polymer systemshave been used for many years in conformance applications.For the pastdecade, the most widely used system has been based on chromium (+3) crosslinkedpolyacrylamide. Organic crosslinkers, such as phenol/formaldehyde andpolyethyleneimine, (PEI) have also been used with a variety of polymers.However, these systems are being scrutinized by regulatory agencies and havenow been scheduled for phase-out in some countries. Because of these issues, asingle, environmentally friendly crosslinker that could be used with a varietyof polymers over a broad temperature range was selected for study.
This article details the laboratory development of an environmentallyfriendly, natural polyamine crosslinker system, namely chitosan.Thiscrosslinker can be used with a variety of polymers, such as polyacrylamide,AMPS/acrylamide (AMPS/AA), or alkylacrylate polymers. Gels ranging from stiffand "ringing" type to "lipping" have been obtained. Additionally, this articlesummarizes results from recent efforts targeted toward designing chitosan-basedgel compositions with improved environmental rating for potential field use.These efforts included using chitosan as the base polymer in combination with asynthetic polymeric crosslinker, as well as developing gels derived completelyfrom natural polymers.
This study primarily focused on conformance water-based gels designed forapplication in wells in which the oil- and water-producing zones were clearlyseparated and could be mechanically isolated. Water-based gel systems forconformance applications included both chromium (+3) crosslinked polyacrylamideand phenol/formaldehyde crosslinker systems for homo-, co-, and ter-polymersystems containing acrylamide.
Recently, a less toxic crosslinker tested extensively in field trialsworldwide enjoyed a high success rate.This system is based on PEIcrosslinker and a copolymer of acrylamide and t-butyl acrylate (PA-t-BA). PEIis a low-toxicity material approved for food contact. Recent test resultsindicate that a variety of polymers containing amide pendant groups arecrosslinked by PEI, presumably through a transamidation reaction pathway toprovide gels (Fig. 1).
However, in some countries, PEI is targeted for replacement by systems thatare less corrosive, less toxic, less bioaccumulating, and which show goodbiodegradability. Base polymers used in conformance gel systems containing acarbon/carbon backbone, although of low toxicity, are resistant tobiodegradation and tend to bioaccumulate or persist in the environment for longperiods.
|File Size||501 KB||Number of Pages||9|
1. Bryant, S.L. et al.: "Polymer Gelants for High TemperatureWater Shutoff Applications," SPEJ (December 1997) 447.
2. Albonico, P. et al.: "Studies on Phenol-FormaldehydeCrosslinked Polymer Gels in Bulk and in Porous Media," paper SPE 28983presented at the 1995 SPE International Symposium on Oilfield Chemistry, SanAntonio, Texas, 14-17 February.
3. Hutchins, R.D. and Dovan, H.T.: "Composition for Selectively ReducingSubterranean Formation Permeability," U.S. Patent No. 5,418,217 (1995).
4. Bryant, S.L. et al.: "Experimental Investigation of theInjectivity of Phenol-Formaldehyde Polymer Gelants," paper SPE 37244presented at the 1997 SPE International Symposium on Oilfield Chemistry,Houston, 18-21 February.
5. Moradi-Araghi, A. and Doe, P.H.: "Thermally Stable Gels forNear-Wellbore Permeability Contrast Corrections ," SPEAT (April 1993)140.
6. Smith, P.L.: U.S. Patent No. 5,836,392.
7. Morgan, J.C., Smith, P.L., and Stevens, D.G.: "Chemical Adaptation andDeployment Strategies for Water and Gas Shut-off Gel Systems," paper presentedat the 1997 RSC Chemistry in the Oil Industry Intl. Symposium, Ambleside, U.K.,14-17 April.
8. Hardy, M.A., Botermans, W.C., and Smith, P.: "Defining the Chemistry of aNew Organically Crosslinked Polymer System for Conformance Applications," paperpresented at the 1998 Intl. Oilfield Chemical Symposium, Geilo, Norway, 22-25March.
9. Hardy, M.A., Botermans, W.C., and Smith, P.: "New Organically Crosslinked PolymerSystem Provides Competent Propagation at High Temperature in ConformanceTreatments," paper SPE 39690 presented at the 1998 SPE/DOE Improved OilRecovery Symposium, Tulsa, 19-22 April.
10. Hardy, M.H. et al.: "TheFirst Carbonate Field Application of a New Organically Crosslinked WaterShutoff Polymer System," paper SPE 50738 presented at the 1999 SPEInternational Symposium on Oilfield Chemistry, Houston, 16-19 February.
11. FDA 175.105: Lamination or sealing of food packaging application. Codeof Federal Regulations, 21.
12. FDA 176.170: Component of paper and paperboard in contact with aqueousand fatty food. Code of Federal Regulations, 21.
13. FDA 176.180: Component of paper and paperboard in contact with dry food.Code of Federal Regulations, 21.
14. FDA 177.1200: Prime coat for cellophane used for packaging foodimpregnate in regenerated cellulose sheet. Code of Federal Regulations, 21.
15. Reddy, B.R. et al.: "Environmentally Friendly Crosslinker System forConformance Polymer Systems," paper No. 3 presented at the 2000 Intl. OilfieldChemical Symposium, Fagernes, Norway, 19-22 March.
16. Reddy, B.R. et al.: "ANatural Polymer-Based Crosslinker System for Conformance Gel Systems,"paper SPE 75163 presented at the 2002 SPE/DOE Improved Oil Recovery Symposium,Tulsa, 13-17 April.
17. Dalrymple, E.D. et al.: "Studies of a Relative PermeabilityModifier Treatment Performed Using Multitap Flow Cells," paper SPE 59346presented at the 2000 SPE/DOE Improved Oil Recovery Symposium, Tulsa, 3-5April.
18. Hach Water Analysis Handbook, third edition, Hach Company, Loveland,Colorado (1997).
19. Dayagi, S. and Degani, Y.: The Chemistry of the Carbon-Nitrogen DoubleBond, S. Patai (ed.) Interscience, London (1970) 61-149.
20. Arai et al.: Bull. Tokai Regional Fisheries Res. Lab., No. 56(1968).