Patent ID: 6431272
Filing Date: 2002-08-13
Classification: E21B,G01N

Abstract:
A bailer, comprising:an elongate, tubular main body having a hollow interior; said elongate, tubular main body having an open upper end and a lower end; a plug for closing said open upper end; a perforation of predetermined size formed in said plug; a check ball and a check ball seat disposed at said lower end of said bailer, said check ball lifting from said check ball seat, when said bailer is lowered into a body of liquid fluid, in response to an inflow of liquid fluid into said hollow interior; said open lower end having a diameter substantially larger than a diameter of said perforation; whereby air in said hollow interior is constrained to flow out of said hollow interior through said perforation as said liquid fluid flows into said hollow interior; whereby a back pressure is created by said air because said air cannot flow through said perforation at a rate of flow that exceeds the rate of flow of said liquid fluid into said hollow interior; whereby liquid fluid flows slowly into said hollow interior; whereby said bailer descends into said liquid body at a slow rate of speed; and whereby agitation of said liquid fluid is reduced.