THE CASE FOR MAKING CONVENTIONAL PETROPHYSICAL WORKFLOWS IN HAHZ WELLS OBSOLETE
OCT 14 2015 -THE CASE FOR MAKING CONVENTIONAL PETROPHYSICAL WORKFLOWS IN HAHZ WELLS OBSOLETE, Ed Stockhausen, Chevron
Conventional petrophysical workflows that make use of point-by-point inversions of measured log data to determine reservoir properties at every sampled measured depth point are now obsolete.
Reservoirs today are being developed using high-angle and horizontal (HAHZ) wells using a single platform or pad for multiple wells. This reality, and the fact that thin-bedded formations such as organic shale reservoirs are now being exploited, results in both resistivity and nuclear measurements that are affected by multiple layers at each measured depth, regardless of whether the conveyance is by logging-while-drilling (LWD) or wireline.
A new workflow is developed to address the geometrical and tool response issues associated with HAHZ well measurements. First, we take advantage of the high "effective" resolution of the density measurement that is a result of the high relative bed dip to define petrophysical layers as thin as 2-in. true stratigraphic thickness (TST) space. Next, the true-layer log properties are determined from inversion and forward modeling. This allows us to compute the layer petrophysical properties of porosity, saturation, fluid type, and permeability using conventional petrophysical algorithms. Another unique aspect of the workflow is that properties are also determined for the non-crossed layers-those that are proximal to and within the volume of investigation of the measurement, but not actually crossed by the well trajectory, i.e., for parallel bed conditions.
The reservoir hydrocarbon pore volumes and permeability can now be computed on a layer-by-layer basis free of adjacent bed and bed-crossing effects. The integration of these petrophysical layer properties are now used as input to reservoir property modeling and upscaling exercises. In a particular field case, the new workflow computed layer boundaries and porosity and permeability match core properties in beds as thin as 3 in.
The use of the newly derived layer properties enables us to more accurately quantify porosity and permeability and explain the unexpected high hydrocarbon flow rates in some layers and the early water breakthrough from water injection in others. With this new information we can now place subsequent development wells in optimal positions to increase ultimate recovery.
Bio for Ed Stockhausen
Ed Stockhausen is a geosteering specialist for Chevron working in the global G&G Operations team based in Houston, TX, a position he assumed in January, 2014. Prior to that, he spent 17 years in Chevron's Energy Technology Company, focused on developing and deploying horizontal wellpath planning, optimized horizontal well placement, and geosteering technology globally. This involved working with both internal and external experts across the industry in the areas of directional drilling and surveying, reservoir, production, drilling, and completion engineering, reservoir geology, formation evaluation, earth modeling, and geosteering.
Ed has been with Chevron for 34 years and holds a Master of Science degree with a major in Geology from the University of Florida in 1981. He started his career with Chevron as a petroleum Geologist based in New Orleans while working on the Gulf of Mexico region. He was part of a team which drilled Chevron's first Gulf of Mexico, horizontal oil well in January 1993 and has been involved in horizontal well drilling projects ever since. Ed developed and published (with his coauthors) the "Flexible Wellpath Planning" methodology and has deployed this globally across Chevron and presented it across the industry. Ed has supported Chevron's Global operations for the last 18 years as a 24-7 consultant and an "on the job" mentor and trainer. He is recognized throughout the industry for his dogged pursuit in improving horizontal well placement and positioning through the utilization of continuous survey data measurements, and his commitment to incorporating geology into drilling plans.
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