Jon L Christensen

US Patent:

48785385, Nov 7, 1989

Filed:

Feb 15, 1989

Appl. No.:

7/312323

Inventors:

Jon B. Christensen - Ankeny IA

Assignee:

Halliburton Company - Duncan OK

International Classification:

E21B 4908

US Classification:

166264

Abstract:

A perforate, test and sample tool for obtaining fluid samples from a formation reservoir in a well. The tool comprises a retrievable packer, perforating guns and a sampler disposed between the packer and guns which is adapted for entrapping a fluid sample without flowing well fluids into the tool string. An operating position is slidably disposed in a cylinder above the packer and is used to actuate a sampler valve in the sampler. A seal insures that all portions of a sampling chamber in the sampler are disposed below the packer. In one embodiment, the operating piston is actuated in response to a pressure differential between a well annulus above the packer and an internal pressure in the tool. The sampler includes a plurality of sampler modules disposed in the sampling chamber. Each of the sampler modules includes a valve which automatically closes after a predetermined volume of fluid fills a sampler module chamber defined in the sampler module.