Naslov
An Overview of Fracturing Treatment Practices in High-Temperature, Naturally Fissured, Gas-Condensate Reservoirs
(High-Temperature, Naturally Fissured, Gas-Condensate Reservoirs)

Autori
Čikeš, Marin ; Omrčen, Božidar ; Economides, Michael J.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
EUROPEC European Petroleum Conference, PROCEEDINGS Volume 2 / - Richardson (TX) : Dallas (TX) : Society of Petroleum Engineers, 1990, 345-354

Skup
1990 SPE European Petroleum Conference

Mjesto i datum
Den Haag, Nizozemska, 21.10.1990. - 24.10.1990

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Hydraulic Fracture; Gas; Condensate; Fissured Reservoir

Sažetak
Eleven hydraulic fracture treatments have been performed in deep (3300 to 3800 m) extremely high-temperature (180 to 195 oC), naturally fissured, gas-condensate reservoirs. Formation permeabilities at the fractured well locations vary in the range of 0.003 to 0.2 md, while the initial formation pressure gradient is approximately 0.13 bar/m. The producing fluid is large gravity gas (0.83 to 1.15 to air) and contains up to 22% CO2 and up to 4% H2S. Job sizes have varied in the range of 300 to 2000 m3 of fluid and 50 to 600 tons of high-strength proppant. Emphasizes in this paper is given to the general approach to well completion and stimulation treatment design, treatment execution, and evaluation. Interesting items include the engineering of the fracturing fluids to sustain their viscosity at the extreme temperatures and to reduce leakoff in these highly fissured formations. An outline of the reservoir description is also given. Posttreatment well production has been excellent in most case. Well productivity index increased from a range of 0.01 to 0.6 m3/d/bar2 to a range 0.235 to 7.83 m3/d/bar2. Treatment results suggest that leakoff control can be accomplished with particulate agents, that delayed crosslinking is the only way to execute these treatments, and that hydraulic fracturing can greatly improve the production from naturally fissured formations. Fracture design and the predicted well production are compared with post-treatment performances in selected wells.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA