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http://gis2.rrc.state.tx.us/public/help/GIS_glossary.html http://www.dcnr.state.pa.us/topogeo/education/es8.pdf http://www.dcnr.state.pa.us/topogeo/oilandgas/wis_home.aspx http://www.dcnr.state.pa.us/topogeo/oilandgas/pa_iris_home.aspx http://www.crwr.utexas.edu/gis/gishydro99/class/vur/termpaper.htm

secondary recoveryvacuum, water flooding, and gas drive.In this type of recovery,called line flood, water injectedinto the wells pushed the oil in the direction of the oil wells.The five-spot method was introduced in 1928. One producing oilwell was centered among four water-injection wells. Five-spot, whichproved to be very effective, was later combined with pressure floodingtechniques
Baker, Ron, 2001, A primer of oilwell drilling-abasic text of oil and gas drilling (6th ed.): Austin,Tex., University of Texas, 192 p.
Devereux, Steve, 1999, Drilling for oil and gas-a nontechnical guide: Tulsa, Okla., PennWell,337 p.

Giddens, P. H., 1948, Early days of oil: PrincetonUniversity Press, 149 p.
Hyne, N. J., 2001, Nontechnical guide to petroleum geology, exploration,drilling, and production (2nd ed.): Tulsa, Okla., PennWell, 598 p.

Selley, R. C., 1998, Elements of petroleum geology (2nd ed.): San Diego,Academic Press, 470 p.Stoneley, Robert, 1995, Introduction to petroleum exploration fornongeologists:Oxford University Press, 119 p.
ADDITIONAL READING 31SPOILGEOLOGY