Innovative Advanced Technologies Overcome Directional Drilling Challenges of S and J Type Wells in N. America and Canada
Bibliographic record
Abstract
Abstract The Barnett Shale field presents numerous drilling challenges. Meeting the increasing demands of natural gas requires economical development by efficient drilling of directional and horizontal wells. The standard technique for drilling S and J type directional wells was by utilizing steerable motors. This technique has several drawbacks: frequent trips to change angle of the AKO for the build/tangent/drop sections, poor hole quality due to string rotation, drillstring/BHA/casing wear, excessive cement volumes due to hole enlargements and high torque and drag due to wellbore tortuosity. Frequently the wells drilled in this field are closely spaced which require precise control of the well path to prevent collision. Steerable motors generate high wellbore tortuosity as corrections to the well path are made after every survey. Automated rib steering systems with rotating drill strings are cost prohibitive for this application. To overcome these drilling challenges a strategy was outlined that comprised of the new non-rotating automated rib-steering system for low inclined 3-D wellbores. Research, field tests and application of innovative and sophisticated technologies has resulted in the development of this state of the art directional drilling system. Since the introduction of the new technology many wells have been drilled in various fields of N. Texas and Canada with a build/drop rate up to 3°/100 ft. All sections of the wellbore (vertical, build, turn, tangent and drop) were performed without having to trip. Inclination of the tangent sections was maintained within +/- 0.2° of the target. Azimuth corrections were made without interrupting the drilling process and all directional operations were carried out by the system's automatic closed loop control. The new system has minimized hole enlargements, reduced torque/drag helping deliver a smooth, high quality wellbore and increased efficiency and quality of cementing operations. This has allowed the operator to log and set tubulars without incident and maximize the productivity from this field. This innovative directional drilling system can be utilized to drill ‘S’ and ‘J’ type directional wells without string rotation, low-inclination convoluted well profiles can be drilled with precision due to constant control over inclination and azimuth. Different sections of the well are drilled without tripping by the systems closed loop control.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".