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Well development by jetting using coiled tubing and simultaneous pumping.
1Department of Engineering Geology, LTH, Lund University, P.O. Box 118, SE-22100 Lund, Sweden. Jan-Erik.Rosberg@tg.lth.se
Ground Water
|May 29, 2009
Summary
Hydrojetting with simultaneous pumping effectively cleans deep wells, significantly reducing drawdown and increasing flow rates. This method enhances well productivity and can be applied to similar projects for efficient development.
Area of Science:
- Hydrogeology
- Well Engineering
Background:
- Deep gravel-packed wells often require development to enhance productivity after initial completion.
- Flow testing revealed suboptimal performance in a 1927-m deep well, necessitating improved well development strategies.
Purpose of the Study:
- To develop and test an effective hydrojetting system for deep well development.
- To quantify the improvements in well productivity achieved through hydrojetting and simultaneous pumping.
Main Methods:
- Development and application of a hydrojetting system utilizing coiled tubing and simultaneous pumping.
- Comparison of pumping test results before and after the hydrojetting operation.
- Utilizing flowmeter logging and short-term pumping tests during the operation to monitor and verify improvements.
Main Results:
- Hydrojetting with simultaneous pumping proved to be an effective well cleaning method.
- A reduction in drawdown of approximately 110 m and an increase in average flow rate of 15 L/s were observed post-jetting.
- The skin factor changed from positive to negative, indicating significant wellbore improvement.
Conclusions:
- The combined hydrojetting and simultaneous pumping technique is highly effective for deep well development.
- Flowmeter data and pumping tests, including the Hantush-Jacob method, are valuable for optimizing and verifying well development.
- This integrated approach offers a controlled and time-efficient method applicable to other deep well projects.
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