US 11,753,934 B2
Automated contamination prediction based on downhole fluid sampling
Anup Hunnur, Tomball, TX (US); and Sefer Coskun, The Woodlands, TX (US)
Assigned to BAKER HUGHES OILFIELD OPERATIONS LLC, Houston, TX (US)
Filed by Anup Hunnur, Tomball, TX (US); and Sefer Coskun, The Woodlands, TX (US)
Filed on Jul. 28, 2021, as Appl. No. 17/387,042.
Claims priority of provisional application 63/058,082, filed on Jul. 29, 2020.
Prior Publication US 2022/0034224 A1, Feb. 3, 2022
Int. Cl. E21B 49/08 (2006.01)
CPC E21B 49/081 (2013.01) 20 Claims
OG exemplary drawing
 
1. A downhole sampling method comprising:
performing a wellbore operation;
receiving fluid data from a fluid downhole in the wellbore operation;
defining a subset of the fluid data and a remaining subset of the fluid data;
iteratively generating, by a processing device, a plurality of curves fit to the subset of the fluid data, wherein iteratively generating the plurality of curves comprises defining a low threshold, a high threshold, and a minimum amount of the subset of the fluid data, and further comprises iteratively generating a first plurality of curves between the low and high thresholds, wherein the high threshold is decremented each iteration to provide a decremented high threshold, until the minimum amount of the subset of the fluid data is met;
performing, by the processing device, a validation on the plurality of curves by applying the first plurality of curves to the remaining subset of the fluid data to determine one or more best fit curves from the first plurality of curves; and
performing the wellbore operation using at least one of the one or more best fit curves, the performing including initiating a sampling procedure based on the at least one of the one or more best fit curves.