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Bob Aylsworth
RevoChem LLC
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“Optimizing Infill Development through Regional Parent Well Production Allocation and Water Analysis Studies”
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Abstract:
In this study, we present a workflow of integrating geochemistry-based reservoir characterization and drainage data, other diagnostic data such as pressure and tracer, along with production data to enable data-driven decision making on infill development and completion design in Delaware Basin. Infill wells are commonly adversely affected by reservoir depletion from surrounding wells. Through analysis of drainage behavior and well interactions of parent and child wells in two landing zones, field development and completion design can be customized for different existing well scenarios. Combining petrophysical with geochemistry-based reservoir characterization and production allocation data also allows for the identification of additional landing zones for maximized reservoir utilization.
Cuttings were collected for the project area over ~2,400’ TVD interval and produced oils were collected from 66 wells. One specific area of infill development was monitored for ~1 year and has 7 existing wells, 3 landed in Formation C1 (Fr C1), 4 in Formation B1 (Fr B1) and 3 infill wells (two in Fr C1 and one in Fr B1). Samples were analyzed using multi-dimensional gas-chromatography (GCxGC). Thousands of organic compounds were resolved in each of the samples that are utilized to reveal reservoir properties and dynamic drainage including drainage frac heights and zonal contributions. Other diagnostic data from independent sources including shut-in pressure responses, pre-frac step down test, and water and oil-soluble tracers are integrated to elucidate frac hits and well communication.
- 1) By integrating various diagnostic data such as geochemistry, pre-frac step down test, and tracers with production data, a new development strategy was devised with customized completion designs to maximize oil production while minimizing water and inter-well communication.
- 2) Time-lapse production allocation provides an effective monitoring of reservoir utilization through time, and identifies additional undrained reservoir for optimization opportunities.
- 3) A regional study informs infill development and identifies three top performing Fr B1 landed wells that have primary drainage from Fr C1.
- 4) Regional water analysis suggests wells in the northern area drain water from their target formations while southern area wells have large water contribution from outside their landing zones.
This methodology reveals a unique 3D reservoir monitoring by integrating vertical drainage and lateral frac wing information from geochemistry, with lateral contribution using tracer data. Results suggest that parent well depletion leads to frac asymmetry in child wells, i.e. a child well tends to see more fracture creation towards the parent well than towards another child well. However, higher reservoir pressure and increased faulting surrounding the child wells appears to override frac asymmetry in driving reservoir drainage and well communication, resulting in stronger drainage overlap between child wells than towards the parent well. Eventually, it is the drainage data that consistently corresponds with the production data and well performance.
Bob Aylsworth is the Business Development Manager at RevoChem. He is a geologist with over 15 years in the oil and gas industry. Bob began his career at Ingrain, a digital rock physics laboratory, where he developed a workflow for imaging and characterizing rocks at the pore-scale. He then joined the unconventional resources exploration team at Apache where he was a geologist and petrography subject matter expert working projects throughout the Permian, Rockies, Egypt, Suriname, and others. In 2021, Bob moved to RevoChem where he uses his technical background and start-up experience to lead the business development efforts. Bob earned both his BS and MS in Geological Sciences from Michigan State University.
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