Well Test Analysis in Naturally Fissured, Geothermal Reservoirs with Fracture Skin

Yinera i d e p o s i t i o n o r a i t e r a t i o n is commonly found a t f r a c t a r e b l o c k l n t e r f a c e s i n f i s s u r e d , geothermal r e s e r v o l r s . I n response t o p r e s s u r e red-uctlon i n t h e f i s s u r e s such m i n e r a l i z a t i o n , i f less permeable than t h e mat r ix rock , w i l l r e t a r d t h e f low of f i a i d from t h e b locks t o t h e f i s s u r e s and i s termed f r a c t u r e s k i n i n t h i s paper . ??le problem of f l u i d f low t o a prodilction wel l i n a double-porosi ty r e s e r v o i r wl th f r a c t u r e s k i n was analyzed t h e o r e t i c a l l y . One of t h e f i n d i n g s of t h e a n a l y s i s was t h a t f i l i l y t r a n s i e n t b l o c k t o f i s s u r e flow can be approximazed by pseudo-steady s t a t e flow i f f r a c t u r e s k i n P e r m e a b i l i t y is s u f f i c i e n t l y low. Type cilrves genera ted by numerical i n v e r s i o n of Laplace t ransform s o i u t i o n s a r e used t o i l l i l s t r a t e t h i s e f fecz . They a r e a l s o used t o c o r r o b o r a t e t h e r e s u l t s of a f i n i t e d i f f e r e n c e model of steam t r a n s p o r t t o a wel l i n a n a t u r a l l y f i s s u r e d , geothermal r e s e r v o i r with f r a c t u r e sk in .