| 摘要 |
A method and apparatus is provided for reducing the purge volume of a well during purging and sampling operations. In some system embodiments, the apparatus can be retrofitted to existing small diameter wells. A further embodiment provides a method and apparatus for using direct pneumatic pressure to purge and sample small diameter wells using a removable valve. This aspect of the invention allows a direct pneumatic pressure pump with a primary valve to be withdrawn through the top of the inside to the pump's pressure holding structure without removing a riser pipe or the system's fluid inlet structure. The invention allows fitting or retrofitting small diameter wells with valves for direct pneumatic pressure purging and sampling. Other embodiments include sealing a removable valve at or above the bottom of a riser pipe, remotely attaching a tool at the top of a removable valve, withdrawing a direct pneumatic pressure pump system's primary valve through the inside of the inside pump's pressure holding structure without removing the riser pipe, and attaching a direct pneumatic pressure pump system's sample return line to its primary valve. Further embodiments include a multiple return line pneumatic pump/well, which allows the use of multiple return lines on a pneumatic pump when used to pump water from very deep wells where piezometric surface of the water is also deep, as well as other uses for direct pressure pneumatic pumping and sampling.
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