Naslov
The Stimulation of a Tight, Very-High-Temperature Gas-Condensate Well

Autori
Economides, Michael J. ; Čikeš, Marin ; Pforter, Harry ; Udick, Thomas H. ; Uroda, Pavle

Izvornik
SPE Formation Evaluation (0885-923X) 4 (1989), 1; 63-72

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Hydraulic Fracture; Gas; Condensate; Case History; Croatia

Sažetak
Well KAL-5, completed in the Moslavacka Gora formation of the Panonian basin in Croatia, was tested at flow rate of 2124 m3/d of gas and 0.45 m3/d of condensate and at last bottomhole pressure (BHP) of 7.5 MPa. Pretreatment evaluation determined a reservoir permeability in the 0.003 to 0.004 md range. The high formation temperature (179 &ordm ; C) poses problems for most fracturing fluids. This paper presents a pretreatment analysis of the well, its geologic setting, and thermal and lithological characteristics as they relate to the choice of the fracturing-fluid system. An outline of the stimulation design and execution is included. After a modest hydraulic fracture treatment, the well flowed for 21 days at a last flow rate of 55000 m3/d of gas and 18.7 m3/d of condensate at a flowing BHP of 6.3 MPa. This substantial increase was apparently caused by the successful hydraulic fracture ; geometric features of the fracture were estimated from interpretation of a posttreatment well test. Posttreatment evaluation assesses the effeciveness of the job, calculates the geometric dimensions and the conductivity of the fracture, and presents forecasts of future performance. Finally, the effects of the evolved gas condensate on the reduction of the apparent reservoir permeability are investigated and evaluated. A correlation between pressure, in-situ condensate saturation, and permeability is offered.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA