E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/124 (2006.01) E21B 34/12 (2006.01) E21B 49/08 (2006.01) E21B 47/06 (2006.01)
Patent
CA 2228439
Method and apparatus for testing and sampling open-hole oil and gas wells. The apparatus comprises 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. In the method of the two-surge test, a clean fluid sample for capturing in the sampler is provided. All of the steps are carried out without flowing fluid to the surface.
Beck Harold K.
Ringgenberg Paul D.
Schultz Roger L.
Setliff Rodney R.
Halliburton Energy Services Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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