Abstract: A wire line sampler is disclosed for extracting a sample of fluid from a predetermined depth in a bore hole. The sampler may be an elongate housing having an interior volume which is connected to the exterior of the tool through a port. The housing contains an assembly for opening the port to allow the bore hole fluid to enter the housing interior upon command of an operator located at the surface. A flow restriction assembly is also provided to control the rate at which the fluid enters. A piston located within the housing closes the port once a sufficient amount of sample has been collected. The collected sample is maintained at the collection pressure without the fear of contamination from fluids at shallower depths and from explosive decompression as the sample is retrieved.

Abstract: A triggering device for actuating a plurality of serially coupled fluid samplers disposed in a borehole includes a housing having a pair of pistons, each coupled to opposing valves in the tandem fluid samplers. The pistons are locked apart by locking bearing urged against the housing by one of the pistons. Closing of the valve in the upper sampler drives one piston releasing the locking bearing and allowing the other piston to move upwards, thus actuating the lower sampler.