Bibliographic record
Abstract
Multilateral Work-Overs: A New Possibility with Coiled Tubing John Ravensbergen John Ravensbergen BJ Services Company Search for other works by this author on: This Site Google Scholar Paper presented at the SPE/IADC Middle East Drilling Technology Conference, Bahrain, October 2001. Paper Number: SPE-72285-MS https://doi.org/10.2118/72285-MS Published: October 22 2001 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Ravensbergen, John. "Multilateral Work-Overs: A New Possibility with Coiled Tubing." Paper presented at the SPE/IADC Middle East Drilling Technology Conference, Bahrain, October 2001. doi: https://doi.org/10.2118/72285-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE/IADC Middle East Drilling Technology Conference and Exhibition Search Advanced Search AbstractThe number of fields that are being developed, or re-developed, using multi-lateral wells to enhance the effective drainage from minimal surface facilities is increasing. Some of these types of wells have complex Level 3, or higher, junctions but the vast majority are still Level 1 junctions.Often drilling and other damage can be imposed on the various exposed leg well bores, as in the case of a Level 1 junction, while the other branches of the well are being drilled. This formation near well bore damage can, in the extreme, lead to a re-evaluation of the field development strategy as there has been no intervention method available to enter the various branches and perform effective stimulation or clean-up and, therefore, achieve the full production potential from the well.This paper describes a new Bottom Hole Assembly (BHA), enabling a new method to workover multilateral wells using coiled tubing. The BHA and its method of navigating through multi-lateral wells makes the assumption a smart and/or selective entry completion is not installed in the well. Therefore, the onus is on the BHA to intelligently navigate through a junction(s) whether it is an open hole or cased hole. The BHA's operational success however, is dependent on the geometry of the junctions.Examples from case studies performed in Canada Venezuela will be used to explain how the geometry is critical for successful operation of the tool. In addition, these case studies will explain what type of workovers have been tested and proven and what further possibilities exist.IntroductionThis paper describes a new bottom hole assembly (BHA), and a lateral entry guidance system (LEGS), herein referred to as the LEGS BHA. The LEGS BHA is a through tubing device and in its current form it is small enough to pass through the completion tubing and function in diameters of typical casings or liners.The BHA can cope with many completion types, however, operational considerations must be made for success. As a result it is now possible to perform workover treatments in well bores that were previously impossible to treat or in a manner which is more cost effective.This paper begins with a brief description of how the tool functions1. Next the completion type, geometry of the junction, and treatment fluid parameters will be reviewed to determine the iMPact these parameters have on the success of the job. Lastly, case histories of completed jobs will be cited to add practical, on the job realism to the discussion.LEGS BHA FunctionThe LEGS BHA is an intelligent robotic device. The BHA controls its own actions depending on the environment in which it finds itself. When the BHA is at the entrance to a lateral, and activated, it will adjust its shape to point directly into the lateral. The BHA will perform the necessary movements without any assistance from the operator, other than its reliance on the supply of hydraulic power. In addition, if the BHA is pointing into the lateral it will communicate this information to the operator at surface. Keywords: oil 25 90 0, kick-off assembly, upstream oil & gas, procedure, iadc spe 72285, sweep assembly, operator, bha, assembly, valve Subjects: Drilling Operations, Directional drilling, Completion Installation and Operations, Coiled tubing operations This content is only available via PDF. 2001. SPE/IADC Drilling 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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.003 |
| Scholarly communication | 0.004 | 0.009 |
| Open science | 0.002 | 0.005 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.026 | 0.005 |
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".