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Well Development by Jetting Using Coiled Tubing and Simultaneous Pumping.

Rosberg, Jan-Erik LU and Bjelm, Leif LU (2009) In Ground Water 47(6). p.806-815
Abstract
During flow testing of a deep, 1927-m, gravel packed screen completed well, it became apparent that well development was needed to increase productivity. A hydrojetting system using coiled tubing in combination with simultaneous pumping was developed and tested and found to be successful. To verify whether the jetting improved the well, the results of a pumping test conducted before and after the jetting operation are compared. In addition, flowmeter logging and hydraulic properties obtained from pumping tests conducted during the jetting operation were also used to verify the improvements. Hydrojetting in combination with simultaneous pumping proved to be an effective cleaning method. After 100 min of pumping, around 110 m less drawdown... (More)
During flow testing of a deep, 1927-m, gravel packed screen completed well, it became apparent that well development was needed to increase productivity. A hydrojetting system using coiled tubing in combination with simultaneous pumping was developed and tested and found to be successful. To verify whether the jetting improved the well, the results of a pumping test conducted before and after the jetting operation are compared. In addition, flowmeter logging and hydraulic properties obtained from pumping tests conducted during the jetting operation were also used to verify the improvements. Hydrojetting in combination with simultaneous pumping proved to be an effective cleaning method. After 100 min of pumping, around 110 m less drawdown and 15 L/s higher average flow rate were obtained compared to the values before the jetting operation. The skin factor was positive before the jetting operation and negative thereafter, thus providing additional evidence of improvements of the well. The flowmeter data also confirmed the improvements and were valuable in optimizing the jetting operation. It was also found, from the short-term pumping tests conducted during the jetting operation, that the Hantush-Jacob method for leaky confined aquifers is a valuable indicator of the well development. The combination of methods used for the well development in this case can easily be applied on other deep well projects to obtain a controlled and time-efficient well development. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ground Water
volume
47
issue
6
pages
806 - 815
publisher
John Wiley & Sons
external identifiers
  • pmid:19473264
  • scopus:70350168550
ISSN
0017-467X
DOI
10.1111/j.1745-6584.2009.00588.x
language
English
LU publication?
yes
id
5bb7fc5a-db7a-46ba-a64c-e6cddd6741a0 (old id 1411952)
date added to LUP
2009-06-11 08:08:08
date last changed
2017-02-12 03:59:03
@article{5bb7fc5a-db7a-46ba-a64c-e6cddd6741a0,
  abstract     = {During flow testing of a deep, 1927-m, gravel packed screen completed well, it became apparent that well development was needed to increase productivity. A hydrojetting system using coiled tubing in combination with simultaneous pumping was developed and tested and found to be successful. To verify whether the jetting improved the well, the results of a pumping test conducted before and after the jetting operation are compared. In addition, flowmeter logging and hydraulic properties obtained from pumping tests conducted during the jetting operation were also used to verify the improvements. Hydrojetting in combination with simultaneous pumping proved to be an effective cleaning method. After 100 min of pumping, around 110 m less drawdown and 15 L/s higher average flow rate were obtained compared to the values before the jetting operation. The skin factor was positive before the jetting operation and negative thereafter, thus providing additional evidence of improvements of the well. The flowmeter data also confirmed the improvements and were valuable in optimizing the jetting operation. It was also found, from the short-term pumping tests conducted during the jetting operation, that the Hantush-Jacob method for leaky confined aquifers is a valuable indicator of the well development. The combination of methods used for the well development in this case can easily be applied on other deep well projects to obtain a controlled and time-efficient well development.},
  author       = {Rosberg, Jan-Erik and Bjelm, Leif},
  issn         = {0017-467X},
  language     = {eng},
  number       = {6},
  pages        = {806--815},
  publisher    = {John Wiley & Sons},
  series       = {Ground Water},
  title        = {Well Development by Jetting Using Coiled Tubing and Simultaneous Pumping.},
  url          = {http://dx.doi.org/10.1111/j.1745-6584.2009.00588.x},
  volume       = {47},
  year         = {2009},
}