Sampling While Drilling: An Emerging Technology
- Julian J. Pop (Schlumberger) | Steven Villareal (Schlumberger) | Francois Bernard (Schlumberger) | Martin Baxter (Murphy Sarawak Oil Company) | Ahmad Hakam (Murphy Sarawak Oil Company) | Andrew Firth (Murphy Oil Sarawak) | Amanda Megat (Schlumberger) | Scott Fey (Schlumberger) | Shahid Haq (Schlumberger) | Nitin Vahi (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- May 2014
- Document Type
- Journal Paper
- 128 - 140
- 2014.Society of Petroleum Engineers
- 1.6 Drilling Operations, 1.10 Drilling Equipment, 1.11 Drilling Fluids and Materials
- drilling, oil-based mud, fluid sampling, contamination
- 8 in the last 30 days
- 819 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
Even though it is the early days of the realization of sampling while-drilling (SWD) as a service, a picture of what might be achievable in practice is beginning to emerge. Previous SWD experience has demonstrated that the sampling process may be controlled sufficiently well that relatively clean samples may be acquired when sampling aquifers drilled with water-based muds (WBMs), and it has demonstrated that the SWD tool and sensors used are capable of operating effectively while withstanding the drilling process. On the basis of this experience, operational guidelines have been formulated, particularly regarding the most opportune time to sample during the drilling process. The first part of the paper describes SWD in a high-angle appraisal well drilled to assess the continuity and quality of several target sands and to establish the degree of continuity of these sands with the main field. The well was drilled by use of an oil based mud (OBM). Samples would be acquired after the well had reached total depth so that the most appropriate sampling points could be identified by means of openhole logs. Multiple water-, oil-, and gas-bearing formations were identified. Sampling duties were split between the SWD tool and a drillpipe-conveyed wirelinesampling (WLS) tool in an attempt to rationalize the sampling program of the well. To enable a comparison of the relative performance of the two tools, two oil-sampling stations were chosen where multiple samples would be acquired under similar operating conditions by both tools. In addition, water samples were collected at two stations by the SWD tool and scanning was performed at one (wet) gas station to confirm the formation-fluid type. Laboratory analysis of the oil samples at the common stations showed that the contaminations and fluid properties of the samples acquired by the two sampling tools were very similar. The second part of this paper describes results obtained in an appraisal well and sidetrack in a different field. Both pilot and sidetrack were high-angle wells drilled by use of OBMs. The purpose of these wells was to identify and evaluate the commercial potential of unproduced hydrocarbon-bearing zones. Both wells were drilled to total depth before conducting sampling operations, and no wireline operations were planned in either well. Five oil samples were acquired in the pilot well in two zones, and four oil samples and two water samples were recovered in the sidetrack. The results obtained during the SWD operations described suggest that it is possible to consistently acquire quality formation fluid samples during drilling operations, even under less-than-optimal sampling conditions and strict time-on-station constraints. The quality of the samples recovered is sufficient to perform reliable pressure/volume/temperature (PVT) analyses.
|File Size||2 MB||Number of Pages||13|
Bourgoyne A. T. Jr., Millheim, K., Chenevert, M., et al. 1991. Applied Drilling Engineering. Richardson, Texas: Textbook Series, SPE.
Chang, Y., Hammond, P. and Pop, J. 2008. When Should We Worry About Supercharging in Formation-Pressure-While-Drilling Measurements? SPE Res Eval & Eng 11 (1): 165–174. http://dx.doi.org/10.2118/92380-PA.
Dong, C., Mullins, O.C., Hegeman, P.S., et al. 2002. In-Situ Contamination Monitoring and GOR Measurement of Formation Fluid Samples. Paper SPE 77899 presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition, Melbourne, Australia, 8–10 October. http://dx.doi.org/10.2118/77899-MS.
Fordham, E., Allen, D.F. and Ladva, H.K.J. 1991. The Principle of a Critical Invasion Rate and Its Implications for Log Interpretation. Paper SPE 22539 presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 6–9 October. http://dx.doi.org/10.2118/22539-MS.
Fujisawa, G., Jackson, R., Vannuffelen, S., et al. 2008. Reservoir Fluid Characterization with a New-Generation Downhole Fluid Analysis Tool. Paper 2008-KK presented at the Society of Petrophysicists and Well-Log Analysts 49th Annual Logging Symposium, Edinburgh, Scotland, 25–28 May.
Galvan Sanchez, F., Cartellieri, A., Pragt, J., et al. 2012. Fluid Analysis and Sampling: The Next Big Step for Logging While Drilling Tools. Paper SPE 152223 presented at the SPE Latin America and Caribbean Petroleum Engineering Conference, Mexico City, Mexico, 16–18 April. http://dx.doi.org/10.2118/152223-MS.
Hammond, P. S. 1991. One- and Two-Phase Flow During Fluid Sampling by a Wireline Tool. Transport Porous Med. 6 (3): 299–330. http://dx.doi.org/10.1007/BF00208955.
Hsu, K., Hegeman, P., Dong, C., et al. 2008. Multi-Channel Oil-Based Mud Contamination Monitoring Using Downhole Optical Spectrometer. Paper 2008-QQQQ presented at the Society of Petrophysicists & Well Log Analysts 49th Annual Logging Symposium, Edinburgh, Scotland, 25–28 May.
Mullins, O. C. 2008. The Physics of Reservoir Fluids: Discovery through Downhole Fluid Analysis. Sugar Land, Texas: Schlumberger.
Mullins, O. C. and Schroer, J. 2000. Real-Time Determination of Filtrate Contamination During Openhole Wireline Sampling by Optical Spectrometry. Paper SPE 63071 presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 1–4 October. http://dx.doi.org/10.2118/63071-MS.
Pop, J., Laastad, H., Eriksen, K.O., et al. 2005. Operational Aspects of Formation Pressure Measurements While Drilling. Paper SPE 92494 presented at the SPE/IADC Drilling Conference, Amsterdam, The Netherlands, 23–25 February. http://dx.doi.org/10.2118/92494-MS.
Stewart, G. and Ayestaran, L. 1982. The Interpretation of Vertical Pressure Gradients Measured at Observation Wells in Developed Reservoirs. Paper SPE 11132 presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, 26–29 September. http://dx.doi.org/10.2118/11132-MS.
Villareal, S., Pop, J., Bernard, F., et al. 2010. Characterization of Sampling While Drilling Operations. Paper SPE 128249 presented at the IADC/SPE Drilling Conference and Exhibition, New Orleans, Louisiana, 2–4 February. http://dx.doi.org/10.2118/128249-MS.
Villareal, S., Pop, J., Bernard, F., et al. 2012. Sampling While Drilling: An Emerging Technology. Paper SPE 159503 presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 8–10 October. http://dx.doi.org/10.2118/159503-MS.