Field and laboratory work sponsored by t h e Cas Research Xnstituto (Cat) 8nd the Department of Energy (WE) have shown t h a t calcium-carbonate scale formation in waters produced with natural gas and o i l can be preventod by injection of phosphonate inhibitor i n t o t h e tomation, even i t h e fornration is sandstone without calcite binding material. c a r r i e d out on DOE'S geopressured-geothermal Gladys Hccall brine-gas well and CRI's to-production wells in the Hitchcock f i o l d .

The d r i l l i n g s i t e was s e l e c t e d as t h e most promising l o c a t i o n w i t h i n reasonable d i s t a n c e o f t h e CPP. a depth near 7500 f t (2300 m). N e i t h e r s i g n i f i c a n t p r o d u c t i o n n o r h i g h temperatures were noted a t t h a t depth, and t h e w e l l was then d r i l l e d t o 10,333 f t (3150 m) w i t h s i m i l a r f i n d i n g s. Rock cores, geophysical logs, and h y d r o l o g i c t e s t s o f t h e w e l l t o date i n d i c a t e t h a t no u s e f u l geothermal resource e x i s t s a t t h i s l o c a t i o n. T h i s r e p o r t presents i n f o r m a t i o n on t h e d r i l l i n g , completion, and t e s t i n g o f INEL-1. The resource was thought t o be l o c a t e d a t i-C ACKNOWLEDGMENTS Acknowledgment i s made of those who provided i n f o r m a t i o n and t e c h n i c a l assistance i n support of t h i s p r o j e c t. L i s t e d b y o r g a n i z a t i o n ,

The fourth Raft River well was originally drilled t o 866 m (2840 f t) , for use as a t e s t injection well. T h i s well allowed the injection o f geothermal fluids i n t o the intermediate zone-above the geothermal production zone and below the shallow groundwater aquifers. After t h i s testing, the well was deepened and cased for use as a production well. The well's designation was changed from RRGI-4 to RRGP-4. T h i s report describes the drilling and completion of both d r i l l i n g projects.

a n a g e a Geo therma 1 Tec hn i cal kvel o pmen t i/d. h. Morfitd Deputy Director i/d. h.

C. 14. Logging S o -v i m s a. At 1,500' Run suite o f logs consisting of:Tal i p c r 6 TZ b. Rt 1,500' After casing job, rsn NCTL d . At 3,500' After c a s -; i~g job, riiri NCTL e. A t 5,000' t?un s u i t e o f logs a t c. above f. A t 5,COO' After casing job, run NCTL g. At 7,500' h. Computerized evalaation Run s u i t e o f l o g s a t c . above i. Misc. additional services Sub Total C. 15. Stabilizers a. 26" hole (non-rotating sleeve) k d y rental Rental $220/Tool/Well x 3