Part IV - Well productivity estimating methods
.pdf
Effect of well interference on total production
Comparison of total inflow into N vertical |
Input data: |
and N horizontal wells |
h = 4 m |
re= 1000 m
40 0 40 0 |
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30 0 |
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Q _v(N) |
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Q _h(N) 20 0 |
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10 0 |
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0 |
0 0 |
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5 |
10 |
15 |
20 |
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1 |
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N |
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20 |
Q(20 vertical wells) = Q(6 horizontal wells with L=200 m) |
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September 15, 2012 |
Part IV - Modern well stimulation |
41 |
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methods (Gubkin - IFP program) |
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Snake and
Undulating Wells
15 September 2012 |
42 |
Snake and Undulating Wells
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productivity, Sm3/d/MPa/m |
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Vertical axis, m |
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Spesific well |
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Horizontal length, m
Inflow profile
Well path
Simplified well path
15 September 2012 |
Ref.: F. Domanyuk |
43 |
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Snake and Undulating Wells
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Cycle |
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q |
2 kh |
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Pk |
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Pз |
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B |
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eRk |
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h |
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2h sin |
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ln |
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ln |
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e 1 rc |
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2Lв sin |
Lв |
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h cos 0,5 |
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where |
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4h |
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– length of a single slant part
φ– angle from vertical
15 September 2012 |
Ref.: F. Domanyuk |
44 |
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Snake and Undulating Wells
For anisotropic reservoir
q |
2 kH h |
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Pk Pз |
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B |
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eRk |
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h |
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2 h sin |
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ln |
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ln |
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L |
e 1 rc |
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2Lв sin |
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в |
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L n h tan |
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– well length in equivalent isotropic medium |
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в |
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sin |
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(h L cos ) / 4h 0.5 |
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0.5 |
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kh / kv |
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– permeability contrast |
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atan(tan / )
– slant angle against the vertical line in equivalent isotropic medium
15 September 2012 |
Ref.: F. Domanyuk |
45 |
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Snake and Undulating Wells
For anisotropic reservoir
Slope of a straight line, degrees
15 September 2012 |
Ref.: F. Domanyuk |
46 |
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High Technology Wells
15 September 2012 |
47 |
What is a high technology well?
Multibranch well (fifth and sixth generations)
Well with complex profile
Well equipped with downhole measurement systems
Well with inflow control systems (passive or active)
First multibranch well after A.M. |
Troll well (North Sea, Norway) SPE 100308 |
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Grigoryan (Bashkiria, 1953) |
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15 September 2012 |
48 |
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Prepared by Alexey Khrulenko, 2010 |
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Multibranch / Multilateral Wells
http://www.slb.com/media/services/resources/oilfieldreview/ors02/aut02/p52_69.pdf
Prepared by Alexey Khrulenko, 2010 |
49 |
15 September 2012 |
«Smart» wells
«Smart well», «Intelligent well » or «High Technology Well» – a well that has several components for acquisition, transmission and analysis of production and reservoir data that enable inflow control at separate perforation intervals for production optimization purpose without well intervention
Main elements:
1.Inflow Control Valves (ICV), unlike Inflow Control Devices (ICD) are operated from the surface and enable to control rate of production from several perforated intervals
2.Downhole measurement systems
3.Packers isolating perforated intervals
15 September 2012
•Prepared by Alexey Khrulenko, 2010
Oil
Oil
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Water |
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1 |
– production casing |
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2 |
– production tubing |
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3 – inflow control devices |
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4 |
– packers |
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5 |
– pressure and temperature transmitters |
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