Mohamed Anwar Abdel-Ghany, Samir Siso, Atef Mohamed Hassan, Petrobel-Egypt, Pastura Pierpaolo, Cherri Roberto, eni This paper was presented at the 10th Offshore Mediterranean Conference and Exhibition in Ravenna, Italy, March 23-25, 2011. It was selected for presentation by OMC 2011 Programme Committee following review of information contained in the abstract submitted by the author(s). The Paper as presented at OMC 2011 has not been reviewed by the Programme Committee.
INTRODUCTION
Radial Drilling is a technique that can create several small diameter drains in a relatively short time and is a fast method to rehabilitate and optimize oil and gas wells, through perforates 25-30 mm diameter holes in the casing at selected depths and azimuth and Installed at single or multiple levels drills radials up to 100 meters perpendicular from the main wellbore. RDS technology offers alternative and/or complement to traditional perforating, can support matrix
acidizing, and steam injection technology. Radial drilling can be applied especially in areas where the water flooding is not efficient (low water saturation) and the reservoir water contact is very close.
Radial drilling is a fast method to rehabilitate and optimize oil and gas wells using modified coiled tubing technology through perforates 30-50 mm diameter lateral holes using high pressure fluid, up to 100 meters radially from the well-bore, the Lateral bores can be drilled at single or multiple levels and it creates a borehole by blasting the formation to powder with high pressure fluid and the hole size depends on formation strength, confining strengths and compressive loads fromoverburden and matrix stress, as well as on the speed of penetration of the jet.
THE ADVANTAGES AND LIMITATIONS OF RADIAL DRILLING
Radial Drilling improve the productivity index (P.I.) of wells by:
· By-passing a possible damaged zone.
· Extending drainage area in productive formations.
· Improving drainage from low permeability, heterogeneous and layered reservoirs.
· Connecting fractures to wellbore in carbonates.
· Improving well geometry in heavy oil application (Both with steam and with cold
production).
Limitations of this technique:
· Difficulties of penetration under a porosity of 3 -4%.
· Maximum working depth about 3000 m.
· Maximum tensile strength 100,000 psi – maximum API grade that can be milled N-80.
· Maximum wellbore inclination 30 degrees and no more than 15 degrees at the zone target
depth/zone of interest
· Bottom Hole Temperature not to exceed 120°C
CASE ONE: WELL 1 (BELAYIM FORMATION):
Belayim formation is a minor zone (fig-7, 8) which has a good potential and high pressure, which
makes it a good candidate for applying Radial drilling technique.
Well 1: it is producing as a commingle from two zones (Belayim+Sidri), the reservoir data (as seen
in table 2) for Belayim formation satisfies all the conditions of radial drilling
(As shown in fig -06) The simulator showed increasing of productivity from 0.78 to 2.92 and
increase in the rate to 120 CM/D declines to 90 CM/D through 7 months and stabilize. The
expected cumulative oil was estimated to be about 300 M BBL after 2 years
RADIAL DRILLING PROCESS FOR WELL 1
6 laterals have been performed in Belayim Formation one lateral 100 m and the other 5 laterals is
50m with a diameter (1-2 inch)
· 3 lat. @ 2275 mMD-20°, 150°, 225°N
· 3 lat. @ 2271 mMD-20°, 150°, 240°N
RADIAL DRILLING PROCESS FOR WELL 2
7 laterals have been performed in sidri formation, 50m length and the depth from 2340m to 2332 m
in with a diameter (1-2 inch)
RADIAL DRILLING PROCESS FOR WELL 3
4 laterals have been performed in sidri formation 50 m with a diameter (1-2 inch)
· 2 lat. @ 2466 mMD-, 115°, 295°N
· 2 lat. @ 2271 mMD-,1.5 turn @ surface
CONCLUSIONS
· The new technology application succeeded from the mechanical point of view as the holes were
drilled successfully.
· Two wells showed an increase in rates, one of them showed a significant improvement that could
be attributed to both high pressure and production enhancement related to radial drilling.
• It is preferable to pass through a consolidated formation to avoid weak sandstone and fines
migration problems
INTRODUCTION
Radial Drilling is a technique that can create several small diameter drains in a relatively short time and is a fast method to rehabilitate and optimize oil and gas wells, through perforates 25-30 mm diameter holes in the casing at selected depths and azimuth and Installed at single or multiple levels drills radials up to 100 meters perpendicular from the main wellbore. RDS technology offers alternative and/or complement to traditional perforating, can support matrix
acidizing, and steam injection technology. Radial drilling can be applied especially in areas where the water flooding is not efficient (low water saturation) and the reservoir water contact is very close.
Radial drilling is a fast method to rehabilitate and optimize oil and gas wells using modified coiled tubing technology through perforates 30-50 mm diameter lateral holes using high pressure fluid, up to 100 meters radially from the well-bore, the Lateral bores can be drilled at single or multiple levels and it creates a borehole by blasting the formation to powder with high pressure fluid and the hole size depends on formation strength, confining strengths and compressive loads fromoverburden and matrix stress, as well as on the speed of penetration of the jet.
THE ADVANTAGES AND LIMITATIONS OF RADIAL DRILLING
Radial Drilling improve the productivity index (P.I.) of wells by:
· By-passing a possible damaged zone.
· Extending drainage area in productive formations.
· Improving drainage from low permeability, heterogeneous and layered reservoirs.
· Connecting fractures to wellbore in carbonates.
· Improving well geometry in heavy oil application (Both with steam and with cold
production).
Limitations of this technique:
· Difficulties of penetration under a porosity of 3 -4%.
· Maximum working depth about 3000 m.
· Maximum tensile strength 100,000 psi – maximum API grade that can be milled N-80.
· Maximum wellbore inclination 30 degrees and no more than 15 degrees at the zone target
depth/zone of interest
· Bottom Hole Temperature not to exceed 120°C
CASE ONE: WELL 1 (BELAYIM FORMATION):
Belayim formation is a minor zone (fig-7, 8) which has a good potential and high pressure, which
makes it a good candidate for applying Radial drilling technique.
Well 1: it is producing as a commingle from two zones (Belayim+Sidri), the reservoir data (as seen
in table 2) for Belayim formation satisfies all the conditions of radial drilling
(As shown in fig -06) The simulator showed increasing of productivity from 0.78 to 2.92 and
increase in the rate to 120 CM/D declines to 90 CM/D through 7 months and stabilize. The
expected cumulative oil was estimated to be about 300 M BBL after 2 years
RADIAL DRILLING PROCESS FOR WELL 1
6 laterals have been performed in Belayim Formation one lateral 100 m and the other 5 laterals is
50m with a diameter (1-2 inch)
· 3 lat. @ 2275 mMD-20°, 150°, 225°N
· 3 lat. @ 2271 mMD-20°, 150°, 240°N
RADIAL DRILLING PROCESS FOR WELL 2
7 laterals have been performed in sidri formation, 50m length and the depth from 2340m to 2332 m
in with a diameter (1-2 inch)
RADIAL DRILLING PROCESS FOR WELL 3
4 laterals have been performed in sidri formation 50 m with a diameter (1-2 inch)
· 2 lat. @ 2466 mMD-, 115°, 295°N
· 2 lat. @ 2271 mMD-,1.5 turn @ surface
CONCLUSIONS
· The new technology application succeeded from the mechanical point of view as the holes were
drilled successfully.
· Two wells showed an increase in rates, one of them showed a significant improvement that could
be attributed to both high pressure and production enhancement related to radial drilling.
• It is preferable to pass through a consolidated formation to avoid weak sandstone and fines
migration problems
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