Limited-Entry Liner With Retrievable Ball-Drop Diversion System in a Deepwater Brazil Field
Bibliographic record
Abstract
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 18113, “Unconventionals Meet Deep Water: Lower-Completion Limited- Entry Liner With Retrievable Ball-Drop Diversion System Applied in a Deepwater Brazil Carbonate Field,” by M.A. Fowler, R.D. Gdanski, P. Campbell, W. Bode, J.M. Baima, and S. Hensgens, Shell, prepared for the 2014 International Petroleum Technology Conference, Kuala Lumpur, 10–12 December. The paper has not been peer reviewed. This paper describes the design, testing, and execution of a unique deepwater completion system that adapts a known multistage ball-drop system used in onshore unconventional reservoirs—for example, in the US and Canada—to a known horizontal openhole sand-control system to matrix acidize a 2000-m horizontal open hole effectively through a limited-entry liner with reservoir segmentation. The system uses a retrievable ball-drop diversion system (RBDDS) consisting of multistage fracture sleeves run on wash pipe. Introduction Low-permeability deepwater carbonate reservoirs have presented many challenges for economical production. The wells typically require extensive reservoir contact that must be stimulated in order to achieve an acceptable productivity index. Field A of the Albian carbonate in the Campos basin offshore Brazil falls into this challenging category (Fig. 1). The field is mature, having been on production since the early 1990s from various Eocene sandstone reservoirs. Initially, the field was produced under depletion by an early production system up to the late 1990s. Then, in the early 2000s, a field redevelopment was performed and production was restarted in 2003 to a floating production, storage, and offloading vessel (FPSO), now with water-injection support. The Quissama member of the Al bian Macae formation in the Campos basin underlies the existing Eocene reservoirs but has not been produced to date. To help extend field life and to evaluate the production potential of this formation, a development/appraisal well was planned to be completed and hooked up to the FPSO and the subsea infrastructure. The Albian carbonate below Fields A and B lies in 769 m of water and exhibits low permeability. For a detailed discussion of the well’s functional specifications and requirements, please see the complete paper.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".