ABSTRACT:

Belayim Land Field is situated in the eastern side of the Central Province of the Gulf of Suez. With the homologous marine field it represents one of the oldest and major oil field in Egypt. The oil production comes from several sandstone layers located within a Miocene clastic section, specifically Rudies, Kareem and Belayim Fms. After a long production history the field has reached its maturity stage with an obvious reduction of the barrels of oil per day. In the last years several actions have been taken by Petrobel to maintain and to increase the oil production level of the field. Among them a key role is played by the drilling of a certain number of horizontal wells to better drain these sandstone reservoirs, whose thickness, sometimes, is less than 5m. When drilling horizontally in such limited bodies, the Navigator tool can detect a contrasting bed boundary located few meters from the sensors enabling to adjust the well's course to stay within a limited pay zone. The horizontal well 113-94H was the first well drilled using the Navigator tool and the Geosteering technique. The original goal was very challenging: to drill a horizontal drain hole of 250 m within a 4.5 m thickness sandstone bed (Sidri Mbr., Zone IV). A 2D pre-modelling was performed in the planning phase using several offset wells. It was decided to use synthetic model data based on well 113-A11 (Fig. 4) and the Resistivity W.D. obtained from the pilot hole for the real-time geosteering correlation. The multiple propagation resistivity and the dual azimuthal gamma ray sensors were used to keep the well path within this reservoir of reduced thickness.

In brief here are the main results:

  • Lateral section length: 216 m M.D.

  • Maximum angle: 90.74 degrees at 2828 m M.D.

  • Net sand: 148 m

  • Net vertical thickness: from 4.3 m to 3.5 m

  • Estimated average oil production before the horizontal hole: 50 m3/d

  • Current average oil production from the horizontal hole: 250 m3/d

  • PI vertical hole: 0.5 Bbls/Psi

  • PI horizontal hole: 2.6 Bbls/Psi

It's proved from these production parameters how a good planning and execution of horizontal drain holes enable a better field production management and reservoir enhancement.

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