Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ” PC
PFS “Surgil field complex costruction with valuable
components retrieval”
2.3 RATES OF THE SURGIL GCF DEVELOPMENT
Surgil gas condensate field is opened in 2002. industrial gas content is established by
testing of the prospecting borehole 1-p.
The field represents two-dome brachyanticlinal of northwest strike. Fold dimension
according to structure contour “-2875m”: length – 21.0km, width – 7.0km at 150m height.
The terrigenous deposits of middle and upper Jura are the fluid-adjoining rocks in the
natural tank on the field. There are allocated 16 productive geological units (5 layers of
upper Jura and 11 layers of middle Jura, representing independent gas condensate deposits)
on the field.
Operative industrial reserves of gas and condensate, accepted on balance as of
01.01.06 make (together with the North Aral area) more than 100 billion m 3 of dry gas.
Initial formation pressure in productive cross-section is varying (upwards) from
295kg/sm 2 to 195kg/sm 2 . Formation temperature is varying from +95 0 С to +78 0 С.
On the average, potential content (g/m 3 ) of methane homologs in native gas through
the field makes: ethane (С 2 ) – 54.0; propane (С 3 ) – 36.3; i butane (С 4 ) – 8.33; n butane (С 4 )
– 9.67; fractions C 3 +C 4 – 54.33; С 5+higher – 44.24.
Natural gases of Surgil field are carbonic-acid-hydrocarbonic, according to
hydrocarbonic content light with the lowered content (moln) of carbonic gas – 0.79 % and
nitrogen – 1.12 %, hydrogen sulfide is not found out. Content of methane – 90.2 %.
The fund of the drilled wells for 01.10.2006 includes:
- 4 operating (well 3, 4, 6. 10);
- 2 in capital repair (degreasing) (well 5. 8);
- 6 in conservation (well 1-p, 2-p, 9. 12. 13, 29);
- 3 in expectation of liquidation (7. 11. 14);
- 2 in test (well 16. 15);
besides, 4 wells are in drilling (well 17. 18. 19. 32);
Total: 21 wells.
Exploratory wells have the single-type light-weight design:
- 299mm surface casing, landing depth is 57-1650m;
- 219mm intermediate casing, landing depth is 1354-2802m;
- 140mm flow string, landing depth is 2323-3158m;
Proceeding from experience of fields development of Ustyurt region (Shakhpakhty, Urga,
East Berdakh-Uchsay) in conditions of compound-formed sandy-argillaceous deposits of upper
and middle Jura, the value of maximum permissible pressure for wells of Surgil field for period
Volume 2. Part 1. EIS Project for Surgil field construction
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