FASTraK Tight Formation
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Case History The FASTrak ™ logging-while-drilling (LWD) fluid analysis sampling and testing service continues to provide customers with answers about their reservoir. The service determined the presence of moveable fluids in a reservoir for a horizontal development well in Norway. Initial pressure tests detected very low mobility measurements ranging between .3 mD/cP to 3.4 mD/cP. The challenge with a sampling and testing operation in these conditions is that the pump out rate during clean up can be extremely low taking many hours. This can lead to stress on downhole pumps and increase the risk of differential sticking. It can take up to 24 hours of pump out before downhole sensors within a tool can detect reservoir fluids during a wireline operation in similar environments. A wireline straddle packer operation in this horizontal well was not a viable option due to the risk of getting stuck. The company representative decided to use the FASTrak LWD service to capture two samples in this reservoir. Baker Hughes positioned the FASTrak tool at a sampling station with a mobility of 1.8 mD/cP. It successfully acquired the first sample after 4½ hours of pumping and the second sample after another 5 hours. The tool successfully acquired two samples at one station after 9½ hours of pumping at a rate of less than 1cc/s. This is a record amount of time for a LWD sampling and testing service to remain stationary while sampling. Results from the PVT laboratory revealed trace amounts of hydrocarbon in the samples indicating the reservoir fluid to be hydrocarbon instead of water. Benefits Verified the presence of moveable fluids in a horizontal well Obtained samples and pressures in an environment unfeasible with wireline tools Increased reliability during extended pump out cycles Background and challenges Horizontal development well, Norway Initial pressure tests measured mobility at .3 mD/cP to 3.4 mD/cP Increased the risk of differential sticking due to low mobility pump out rate during cleanup and sampling Wireline straddle packer in this horizontal well was not a viable option due to the risk of getting stuck Baker Hughes solution and results FASTrak service successfully acquired two samples on one station after 9½ hours of pumping at a rate of less than 1cc/s PVT laboratory results revealed trace amounts of hydrocarbon in the samples indicating the reservoir fluid was hydrocarbon and not water 0 100 200 300 400 500 Time [min] 14 12 10 8 6 4 2 0 Apparent + Effective Pump Rate [cm 3 /s] Effective Total Volume Pumped [I] 6 5 4 3 2 1 0 Sample #1 Taken Sample #2 Taken The cross plot shows the pump out rate and volume pumped versus time during cleanup at a single station. The FASTrak tool acquired the first sample after 4½ hours of pumping and the second sample after 9½ hours. Due to the low mobility the pump rate never exceeded 1 cc/s. © 2012 Baker Hughes Incorporated. All rights reserved. 36690 08/2012 www.bakerhughes.com Disclaimer of Liability: This information is provided for general information purposes only and is believed to be accurate as of the date hereof; however, Baker Hughes Incorporated and its affiliates do not make any warranties or representations of any kind regarding the information and disclaim all express and implied warranties or representations to the fullest extent permissible by law, including those of merchantability, fitness for a particular purpose or use, title, non-infringement, accuracy, correctness or completeness of the information provided herein. All information is furnished “as is” and without any license to distribute. The user agrees to assume all liabilities related to the use of or reliance on such information. BAKER HUGHES INCORPORATED AND ITS AFFILIATES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES FROM ANY CAUSE WHATSOEVER INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE. FASTrak LWD Service Collects Fluid Samples in an Extremely Tight Formation Record setting pump out time for LWD sampling
description
Formation Evaluation
Transcript of FASTraK Tight Formation
C a s e H i s t o r y
The FASTrak™ logging-while-drilling (LWD) fluid analysis sampling and testing service continues to provide customers with answers about their reservoir. The service determined the presence of moveable fluids in a reservoir for a horizontal development well in Norway.
Initial pressure tests detected very low mobility measurements ranging between .3 mD/cP to 3.4 mD/cP. The challenge with a sampling and testing operation in these conditions is that the pump out rate during clean up can be extremely low taking many hours. This can lead to stress on downhole pumps and increase the risk of differential sticking.
It can take up to 24 hours of pump out before downhole sensors within a tool can detect reservoir fluids during a wireline operation in similar environments. A wireline straddle packer operation
in this horizontal well was not a viable option due to the risk of getting stuck. The company representative decided to use the FASTrak LWD service to capture two samples in this reservoir.
Baker Hughes positioned the FASTrak tool at a sampling station with a mobility of 1.8 mD/cP. It successfully acquired the first sample after 4½ hours of pumping and the second sample after another 5 hours.
The tool successfully acquired two samples at one station after 9½ hours of pumping at a rate of less than 1cc/s. This is a record amount of time for a LWD sampling and testing service to remain stationary while sampling.
Results from the PVT laboratory revealed trace amounts of hydrocarbon in the samples indicating the reservoir fluid to be hydrocarbon instead of water.
Benefits
�� Verified the presence of moveable fluids in a horizontal well
�� Obtained samples and pressures in an environment unfeasible with wireline tools
�� Increased reliability during extended pump out cycles
Background and challenges
�� Horizontal development well, Norway
�� Initial pressure tests measured mobility at .3 mD/cP to 3.4 mD/cP
�� Increased the risk of differential sticking due to low mobility pump out rate during cleanup and sampling
�� Wireline straddle packer in this horizontal well was not a viable option due to the risk of getting stuck
Baker Hughes solution and results
�� FASTrak service successfully acquired two samples on one station after 9½ hours of pumping at a rate of less than 1cc/s
�� PVT laboratory results revealed trace amounts of hydrocarbon in the samples indicating the reservoir fluid was hydrocarbon and not water
0 100 200 300 400 500Time [min]
14
12
10
8
6
4
2
0
Appa
rent
+ E
ffect
ive P
ump
Rate
[cm
3 /s] Effective Total Volum
e Pumped [I]
6
5
4
3
2
1
0
Sample #1 Taken
Sample #2 TakenThe cross plot shows the pump out rate and volume pumped versus time during cleanup at a single station. The FASTrak tool acquired the first sample after 4½ hours of pumping and the second sample after 9½ hours. Due to the low mobility the pump rate never exceeded 1 cc/s.
© 2012 Baker Hughes Incorporated. All rights reserved. 36690 08/2012
www.bakerhughes.comDisclaimer of Liability: This information is provided for general information purposes only and is believed to be accurate as of the date hereof; however, Baker Hughes Incorporated and its affiliates do not make any warranties or representations of any kind regarding the information and disclaim all express and implied warranties or representations to the fullest extent permissible by law, including those of merchantability, fitness for a particular purpose or use, title, non-infringement, accuracy, correctness or completeness of the information provided herein. All information is furnished “as is” and without any license to distribute. The user agrees to assume all liabilities related to the use of or reliance on such information. BAKER HUGHES INCORPORATED AND ITS AFFILIATES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES FROM ANY CAUSE WHATSOEVER INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE.
FASTrak LWD Service Collects Fluid Samples in an Extremely Tight FormationRecord setting pump out time for LWD sampling
