MDT Applications in CBM
HamidReza Pourabed Reservoir Engineer
[email protected]
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Agenda • Mini-DST (Pressure, Permeability, Skin, PI) • Mini-Frac (Minimum Horizontal Stress) • Long Spacing MDT configuration
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MDT (Modular Dynamic Tester) • • •
•
MDT modularity helps to customize tool string based on job objectives There is a main flowline throughout the tool Each module may have its own flow line isolated from main flow line by valves Module functionalities are customized to achieve the objective of the specific module task
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Primary Objective of Formation Tester The Modular Dynamics Tester (MDT) is an open hole wireline instrument primarily used for measuring vertical pressure distribution in a reservoir, as well as for recovering formation fluid samples.
Formation Pressure
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Dual Packer Module (PA) • • • •
Pressure Test in CBM Mini-DST Mini-Frac Sampling Packer Diameter Max Temp. in DegC 5 175 6¾ 175 8 ⅟2 175
Inlet Port Pressure psi 20,000 20,000 20,000
Now we can use 2xPA to increase the spacing even more than 11m
Hole Diameter Min (in) Max (in) 6 7⅕ 7⅞ 9⅝ 12 ⅟4 14
0.4m
Interval valve
1m 1.6m 2.5m 3.4m
Strain gauge Quartz gauge Bypass flowline 5
Pump Module • Pump-In • Pump-Out • Pump between modules
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Flexible Pump Rate Pump Stroke Min. Flow Rate Displacement Size (Rough Estimation) Unit
Max. Flow Rate (Rough Estimation)
Min. Flow Rate (Rough Estimation)
Max. Flow Rate (Rough Estimation)
B/D
B/D
cc/sec
cc/sec
Standard
485
2.3
19.6
4.3
36
High Pressure Extra-High Pressure
366
1.8
15.2
3.3
28
170
1.3
10.9
2.4
20
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MDT MINI-DST
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IPTT (Mini-DST) • Determination of: – – – – – –
Pressure Permeability Skin Rate Dependent Skin Productivity Index AOFP
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What is Mini-DST
Pump rate
Pressure
PRESSURE TRANSEINT
IPTT (Mini-DST) Example
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LONG SPACING CONFIGURATION
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Long Spacing Configuration Gamma Ray and Telemetry
Upper Exit Port
3.4m
Upper Pumpout Module
11.4m 7.5m 9.9m
1m
Single Probe Module Lower Pumpout Module Lower Exit Port
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Long Spacing Configuration
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Pressure Derivative Plot
K.H= 14.4 mD.m H= 9m K=1.6 mD Skin=-1.49
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Multi-Seam Tests Build-Up (Zone 1) Build-Up (Zone 1)
Build-Up (Zone 2)
Build-Up (Zone 2)
Zone 2
Total
Zone 1
Build-Up (Both Zones)
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Multi-Seam Tests
Total
1
Zone 2
Zone 1
Pressure [psi]
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test 1-430.8m-442.2m_Bottom Packer_PAQP_Zone 2 Rate.ks3 - Analysis 2 test 1-430.8m-442.2m_Top Packer_PAQP2_Zone 1 Rate.ks3 - Analysis 2 Test4 (Repeat of Test 1).ks3 - Analysis 3 (ref)
0.1 1E-3
0.01
0.1
1
10
Time [min]
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Current Available Long Spacing Configurations
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Mini-DST Limitations/ Challenges • Packer to be seat over good calliper Sand/Shale formations (
