Installing 56 Surface Casing Strings in 40 Well Slots Successfully in Bohai Bay, China
Bibliographic record
Abstract
Abstract ConocoPhillips is developing the Peng Lai field in Bohai Bay offshore China with six wellhead platforms (WHP) in 28 m (92 ft) of water. Phase I entailed one 24 slot WHP and a leased FPSO that has been in production since 2002. Phase II will have five 40 slot WHP's and a permanent FPSO. Phase II production began in 2007. The 24 inner slots of four of the Phase II WHP's will have 20″ drive pipe conductors and the 13 3/8″ surface casing will be installed by drilling with casing. The 16 outer slots, 8 on the north row and 8 on the south row, will have 36″ drive pipe conductors and provide dual bore 13 3/8″ surface casing strings in each slot. These holes will be directionally drilled at a slight angle to facilitate subsequent directional drilling. The 56 wells drilled from a 40 slot WHP reduces the size and cost of the platform while providing additional wells to meet the reservoir development plan. A portion of the wells will be "pre-drilled" from a jack-up through the WHP jacket while the topsides are under construction. The 13 3/8″ surface casing strings, using both the drill with casing and dual bore methods, are installed during batch setting programs. The jack-up pre-drills wells below surface casing until the topsides installation begins, at which time the jack-up moves to the next platform and repeats the process. After the topsides are installed on the WHP, a self contained platform rig continues the drilling and completion program. The drilling program on the last WHP, to be installed in 2009, will be conducted exclusively from a platform rig, including the 13 3/8″ drill with casing program in all 40 slots. This paper will describe the well construction program as part of the field development plan, the installation procedures, results of the surface casing installation programs and the drilling cost savings realized as a result of using drill with casing and dual bore conductor technologies.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".