EP 1110-1-27
27 Jan 00
(a) If air lifting was applied, what was the size and capacity of the air compressor, at what depth
was the airline set?
(b) If surging was applied, what was the configuration of the surge block assembly, does the
diameter of the assembly match the casing and screen, through what intervals was it applied, and what
was the length and speed of the stroke?
(c) If jetting was applied, what was the configuration of the jetting tool, through what intervals
was is applied, etc. (nozzle velocity and distance from screen)?
(d) Other pertinent information, e.g., how much time was spent on each interval in cleaning.
(e) What predevelopment planning and decisions were made that would make development more
or less likely to be successful?
d. Development data gathering. Valid and complete development information is necessary to
assess results and to provide benchmarks for future development efforts. This information is recorded in a
well development log and collected with drilling and well construction log information (see example
forms in Appendix D). Minimum development information necessary includes:
(1) Drilling method description -- it affects development methods chosen and how field data are
reported.
(2) Description of development procedures used -- air lifting, jetting, surge blocking, etc.,
including descriptions of equipment and capacities (e.g., air compressor cubic feet per minute (cfm)
capacity).
(3) Time for each segment.
(4) Description of material drawn into well -- amount and type to determine its origin (need to
know if it is aquifer or well pack), standards of development and how measured.
step-drawdown data, well construction data, and lithologic data to provide insight into how the aquifer
material has been modified or is behaving through time in the vicinity of the well. This insight is crucial
for assessing changes in well performance and the appropriateness and effectiveness of maintenance and
rehabilitation efforts.
f. Development data gathered and significance.
(1) Development time. The effectiveness of even an appropriate development method is related to
the amount of time it is applied, and it must be determined if the time of application was sufficient for the
method to be effective. Development data should include the amount of time devoted to each of the tools
and methods mentioned above. The construction log may provide the amount of time devoted to
development, or the work crews' time sheets or daily log may also provide the time devoted.
(2) Development results. The data should include some form of documentation of the progress of
the development. Some drillers estimate changes in the discharge from the well during air lifting or
surging to indicate the progression of development. The driller may record a qualitative description of the
sediment and material removed from the well. A semi-quantitative record of the sediment concentration
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