Rodney R Setliff

US Patent:

58266623, Oct 27, 1998

Filed:

Feb 3, 1997

Appl. No.:

8/792744

Inventors:

Harold K. Beck - Copper Canyon TX
Paul D. Ringgenberg - Carrollton TX
Roger L. Schultz - Stillwater OK
Rodney R. Setliff - Corinth TX

Assignee:

Halliburton Energy Services, Inc. - Dallas TX

International Classification:

E21B 3312

US Classification:

166387

Abstract:

Method and apparatus for testing and sampling open-hole oil and gas wells. The apparatus includes a packer, a surge chamber, a closure valve which may be opened to flow fluid into the surge chamber, and a sampler. The surge chamber may be one of a pair of surge chambers, and the closure valve may be one of a pair of closure valves so that two surges may be carried out prior to obtaining a fluid sample in the sampler. In operation, the packer is placed in a set position by setting down weight. The closure valves are also actuated when weight is set down. The first closure valve has a first predetermined time delay before opening so that the packer may be set, and the second closure valve has a second predetermined time delay so that the packer may be set and the first closure valve opened before a fluid sample is captured. By opening a vent tool at an upper end of the uppermost surge chamber, formation fluid may be forced back into the formation or zone of interest by a bull-heading operation. In a preferred embodiment, portions of the apparatus are detachable in the event of sticking of the apparatus in the well.