Laboratory Investigation on Profile Modification of Oil Reservoir Fluids by Water-insoluble Polymer Producing Microorganism CJF-002
Bibliographic record
Abstract
Abstract： Microbial EOR (MEOR) fi eld test 1 -4) was carried out in Fuyu oilfi eld, China.In this fi eld test, Enterobacter sp.CJF-002 7) which produced insoluble polymer was injected with nutrient, and oil production increased more than twice in volume because the high permeable zones were plugged with the polymer, and the water channeling was reduced 8, 9) .Our research group carried out experimental studies to analyze the mechanisms of profi le modifi cation by the polymer produced by CJF-002.Firstly, 10m one-dimensional reservoir model was used for analyzing the polymer production behavior of CJF-002.CJF-002 was injected with nutrient and incubated.After the incubation, water was injected to observe the pressure of every 1m-point.As a result, high differential pressure was observed at the section of 0-1m and 3-4m.That is, CJF-002 produced the polymer at these section more actively.Moreover, it was suggested that a mixture of culture solution and brine improved pH of culture solution, and this improvement reactivated the polymer production of CJF-002 at the middle section (3-4m) and lower section.Secondly, network model was used for analyzing the effect of the polymer on profi le modifi cation.This model consisted of three 4m-low permeable sand-packs and one 4m-high permeable sand-pack.These sand-packs were reticulately jointed together at every 1m-point.CJF-002 was injected with nutrient from the central inlet and synthetic brine was injected from the other two inlets.Absolute permeability and fl ow rate of each section were calculated from the pressure observed at every jointing point.As a result, CJF-002 produced a signifi cant amount of polymer in all the high permeable hose and the permeability of high permeable hoses decreased to approximately 1/2 of original permeability.Consequently, the fl ow rate of high permeable hoses decreased and that of low permeable hoses increased.It showed that the polymer produced by CJF-002 was effective on the profi le modifi cation.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 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 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".