Fully Coupled Chemico-Geomechanics Model and Applications to Wellbore Stability in Shale Formation in an Underbalanced Field Conditions
Bibliographic record
Abstract
Fully Coupled Chemico-Geomechanics Model and Applications to Wellbore Stability in Shale Formation in an Underbalanced Field Conditions Yarlong Wang; Yarlong Wang Petro–Geotech Inc. Search for other works by this author on: This Site Google Scholar Baoping Lu Baoping Lu New Star Company Search for other works by this author on: This Site Google Scholar Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Calgary, Alberta, Canada, November 2002. Paper Number: SPE-78978-MS https://doi.org/10.2118/78978-MS Published: November 04 2002 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Wang, Yarlong, and Baoping Lu. "Fully Coupled Chemico-Geomechanics Model and Applications to Wellbore Stability in Shale Formation in an Underbalanced Field Conditions." Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Calgary, Alberta, Canada, November 2002. doi: https://doi.org/10.2118/78978-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Thermal Operations and Heavy Oil Symposium Search Advanced Search Abstract Time-dependent wellbore stability has been observed in the field. Yet, a combined effect of pore fluid advection, swelling shale, and thermal diffusion may not be sufficient to explain and simulate this process adaquately. A coupled chemico- geomechanics constitutive model combined with a model with an ion-concentration dependent strength is developed in this paper. Strength reduction due to water hydration seems to dominate the time-dependent process in wellbore collapse. The ultimate borehole instability is proposed to be determined by the damage radius not the onset of wellbore wall mechanics failure, the latter is usually practiced. A field case is analyzed, and from experimental testing and simulations, it is concluded that the time-dependent nature is dominated both by the time- dependent strength reduction and damage zone propagation. Keywords: mechanism, upstream oil & gas, hydration, wellbore design, concentration, permeability, shale, strength reduction, ion transport, solute concentration Subjects: Wellbore Design, Drilling Operations, Drilling Fluids and Materials, Reservoir Characterization, Reservoir Fluid Dynamics, Unconventional and Complex Reservoirs, Wellbore integrity, Reservoir geomechanics, Flow in porous media Copyright 2002, SPE/PS-CIM/CHOA International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference You can access this article if you purchase or spend a download.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".