Method and Apparatus for Gas displacement Well Systems
First Claim
1. An apparatus for sampling fluid within a well having a riser pipe having an internal wall, the riser pipe extending from a ground surface to a fluid inlet structure comprising any of a filter and a screen, the apparatus comprising:
- a valve structure;
means for extending the valve structure down the riser pipe from the ground surface toward the fluid inlet structure;
a sample return line located in the riser pipe above the valve structure;
means for controllably establishing a seal between the valve structure and the riser pipe;
means for applying direct pneumatic pressure down the riser pipe structure;
means for sampling at least a portion of the fluid within the well;
means for controllably releasing the seal between the valve structure and the riser pipe; and
means for retrieving the sampling means and at least a portion of the valve structure up the riser pipe toward the ground surface.
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Accused Products
Abstract
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 This aspect of the invention allows a direct pneumatic pressure pump with a primary valve to be withdrawn through the top of the inside to the pump'"'"'s pressure holding structure without removing a riser pipe or the system'"'"'s fluid inlet structure.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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Citations
22 Claims
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1. An apparatus for sampling fluid within a well having a riser pipe having an internal wall, the riser pipe extending from a ground surface to a fluid inlet structure comprising any of a filter and a screen, the apparatus comprising:
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a valve structure;
means for extending the valve structure down the riser pipe from the ground surface toward the fluid inlet structure;
a sample return line located in the riser pipe above the valve structure;
means for controllably establishing a seal between the valve structure and the riser pipe;
means for applying direct pneumatic pressure down the riser pipe structure;
means for sampling at least a portion of the fluid within the well;
means for controllably releasing the seal between the valve structure and the riser pipe; and
means for retrieving the sampling means and at least a portion of the valve structure up the riser pipe toward the ground surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for sampling fluid within a well having a riser pipe having an internal wall, the riser pipe extending from a ground surface to a fluid inlet structure comprising any of a filter and a screen, the process comprising the steps of:
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providing a valve structure;
extending the valve structure down the riser pipe from the ground surface toward the fluid inlet structure;
controllably establishing a seal between the valve structure and the riser pipe;
applying direct pneumatic pressure down the riser pipe structure;
collecting at least a portion of the fluid within the well;
controllably releasing the seal between the valve structure and the riser pipe; and
retrieving at least a portion of the valve structure up the riser pipe toward the ground surface. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification