Patent ID: 6408691
Filing Date: 2002-06-25
Classification: E21B

Abstract:
A well monitoring apparatus for burial in the ground to sample and monitor subsurface water comprising:a cylindrical bailer unit having a top end wall, a bottom end wall, and a side wall communicating with both of said top end wall and said bottom end wall; a bailer reservoir chamber defined by the area between said top end wall, said bottom end wall and said sidewall; an intake pipe, said intake pipe having an external end communicating with a fluid collection reservoir outside said bailer reservoir chamber, said intake pipe having an internal end located inside said bailer reservoir chamber, a passageway communicating through said pipe from said internal end to said external end; means to prevent flow through said passageway from said internal end toward said external end thereby allowing only flow from said external end to said internal end; a discharge pipe, said discharge pipe having an entry end located in a lower end of said bailer reservoir chamber, and having an exit end located at a collection point outside said bailer reserviour chamber; a conduit communicating through said discharge pipe from said entry end to said exit end; means to prevent flow through said conduit from said exit end toward said entry end thereby allowing only flow through said conduit from said entry end toward said exit end; means of pressurizing said bailer reservoir chamber for a determined time period of pressurization, whereby fluid collected in said fluid collection reservoir and communicated through said intake pipe to said bailer reservoir chamber is forced through said conduit in said discharge pipe and thereafter discharging at a collection point at said exit end of said conduit, during said determined time period of pressurization.