--> Case Studies Confirm Downhole Sensor Measurements and Verify Sample Quality Using New Non-Invasive Sample Testing Method, Eyuboglu, Sami; Pelletier, Mickey; Rourke, Marvin; van Zuilekom, Tony; Saghiyyah, George; Mulyo, Witjaksono M.; Silva, Andre; Palmer, Richard, #90100 (2009)
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Case Studies Confirm Downhole Previous HitSensorNext Hit Measurements and Verify Sample Quality Using New Non-Invasive Sample Testing Method

Eyuboglu, Sami1
 Pelletier, Mickey1
 Rourke, Marvin2
 van Zuilekom, Tony1
 Saghiyyah, George3
 Mulyo, Witjaksono M.3
 Silva, Andre3
 Palmer, Richard3

1Halliburton, Houston, TX.
2
Halliburton, Al Khobar,
Saudi Arabia.
3
Saudi Aramco,
Dhahran, Saudi Arabia.

When samples are obtained using a wireline pumpout formation testers, downhole sensors are used to estimate the sample quality and contamination during the sampling process. However in many cases the samples can be altered when they are retrieved at the surface or in their transport from the rig site to a PVT lab. Currently the only methods of examining the samples require opening the chambers which risks corrupting the integrity of the sample. Therefore, this research offers an alternative approach to onsite sample analysis where when the samples are brought to the surface new non-invasive measurements can be made that do not require opening the sample chamber. These measurements enable the determination of fluid properties which are then used for fluid identification and verification of the sample quality. The fluid property measurements can be compared directly with the downhole Previous HitsensorNext Hit measurements to verify that the sample integrity has been maintained. This new method also enables well site decisions to be made regarding which samples are the most representative and documents the condition of the samples just prior to being transported to a PVT lab.

The sample chamber design is an integral element to the new non invasive measurements in that it enables the precise measurement of the sample volume in the chamber. By knowing the dead weight of the chamber and the weight with the sample and its precise volume, an accurate density measurement can be made. Then by monitoring the sample volume changes while applying pressure to the sample the compressibility can be determined. These measurements can be performed on standard sample chambers, as well as on nitrogen-compensated chambers. To verify that the sample properties have not been altered the surface measurements can be compared with the downhole fluid ID Previous HitsensorNext Hit measurements. Estimates of contamination can be made by combining the surface measurements with downhole Previous HitsensorTop measurements.

To demonstrate the utility of these new measurements, a range of field examples are presented that include water, oil, and gas samples in the presence of varying oil- and water-based mud contamination. In addition to comparisons with downhole measurements, the new surface measurements are compared to subsequent laboratory measurements to verify the validity of the new technique. Then conclusions and recommendations made based primarily on the experience of the field examples.

 

AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil