New Life for Old Wells - A Case Study of the Effects of Re-Stimulating Gas Wells Using Fracturing Through Coiled Tubing and Snubbing Techniques
Bibliographic record
Abstract
New Life for Old Wells - A Case Study of the Effects of Re-Stimulating Gas Wells Using Fracturing Through Coiled Tubing and Snubbing Techniques Chad Gutor; Chad Gutor Enerplus Resources Fund Search for other works by this author on: This Site Google Scholar Ali Al-Saleem; Ali Al-Saleem Schlumberger Canada Ltd. Search for other works by this author on: This Site Google Scholar Bruce Rieger; Bruce Rieger Schlumberger Canada Ltd. Search for other works by this author on: This Site Google Scholar Stephen Lemp Stephen Lemp Schlumberger Canada Ltd. Search for other works by this author on: This Site Google Scholar Paper presented at the SPE/ICoTA Coiled Tubing Conference and Exhibition, Houston, Texas, April 2003. Paper Number: SPE-81730-MS https://doi.org/10.2118/81730-MS Published: April 08 2003 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Gutor, Chad, Al-Saleem, Ali, Rieger, Bruce, and Stephen Lemp. "New Life for Old Wells - A Case Study of the Effects of Re-Stimulating Gas Wells Using Fracturing Through Coiled Tubing and Snubbing Techniques." Paper presented at the SPE/ICoTA Coiled Tubing Conference and Exhibition, Houston, Texas, April 2003. doi: https://doi.org/10.2118/81730-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE/ICoTA Well Intervention Conference and Exhibition Search Advanced Search AbstractThe use of a coiled tubing conduit for the hydraulic fracturing of shallow gas wells in southern Alberta, Canada has increased each year since its beginnings in 1997. The coiled tubing fracturing (CTF) technique has been utilized for both new and old wells as a means of fracture-stimulating multiple reservoir intervals.This paper will detail a re-stimulation project completed during the summer and fall of 2002, in which the CTF and snubbing-conveyed fracturing (SF) processes were utilized to re-fracture a group of shallow gas wells that were originally completed in the 1970s. The objective is to examine the possible ways of enhancing production of older shallow gas wells by fracture stimulation utilizing tubing-conveyed processes.Specifically, the paper will outline ways to consider and select wells that are candidates for re-entries, in addition to the essential work and evaluation that has to be done both prior to and following the re-entry, re-perforation, and stimulation techniques. This study will also provide a relative comparison between conventional fracturing techniques used previously and the CTF and SF processes used most recently. Also included are pre- and post-stimulation production data that give a clear indication of how effective the fracturing through tubing process is when used to re-stimulate these older wells.IntroductionThe wells of interest conducted in this study are located in southeastern Alberta, Canada. They are vertical, shallow, gas wells that are 300 to 500 meters (984 to 1641 ft) in depth. The producing formations of interest are the Medicine Hat and the Milk River, layered shaly sandstone formations that fracture easily.These wells have been operational since the 1970's and were initially stimulated through casing using single-stage fracturing treatments, with ball sealers being used in an attempt to divert the treatment to multiple perforation sets. This paper examines the re-entry stimulation work done on a total of 15 wells. Ten were stimulated through CTF, and five were stimulated through Snubbing Conveyed Fracturing (SF). There were several reasons for using tubing-conveyed stimulation for this set of re-entry wells:Weak casing integrity of the wells, hence precluding stage or segregated zonal stimulation (stage fracturing) as a stimulation procedure.Minimization of production downtime for recompletion operationsEconomical stimulation of bypassed payThe economical and practical application of tubing-conveyed stimulation in the shallow gas areas of the Western Canadian Sedimentary Basin has been well documented.1,2,3 This paper will focus on the methods adopted to choose wells that were candidates for stimulation, well preparation work, and some of the obstacles encountered in carrying out the re-entry stimulation. Keywords: stimulation, completion installation and operations, well intervention, re-stimulating gas well, production data, upstream oil & gas, stimulation effectiveness, coiled tubing operations, shallow gas well, initial tmapr Subjects: Hydraulic Fracturing, Perforating, Completion Installation and Operations, Well Intervention, Coiled tubing operations, Re-stimulation (excluding re-fraccing), Completion Operations This content is only available via PDF. 2003. Society of Petroleum Engineers You can access this article if you purchase or spend a download.
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 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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".