Pressure-controlled well tester adapted to be selectively retain

Details Pressure-controlled well tester adapted to be selectively retain Pressure-controlled well tester adapted to be selectively retain

1991-10-09

1994-08-16

Dang, Hoang C.

Wells

Valves, closures or changeable restrictors

Fluid operated

166240, 166332, E21B 3410

Patent

active

053378270

ABSTRACT:
In the present invention a testing tool having an axial flow passage is arranged to be connected in a pipe string and placed in a well bore. Communication through the flow passage is controlled by a valve member which is cooperatively arranged in the body to be moved back and forth for selectively opening and closing communication through the flow passage. The testing tool further includes upper and lower mandrels that are selectively coupled together by a unique clutch mechanism that enables the valve member to be successively opened and closed as the well bore pressure is increased and decreased a predetermined number of times in a testing cycle. The clutch mechanism is thereafter operable for temporarily uncoupling the mandrels to enable the valve member to be retained in its open position as the well bore pressure is increased and decreased in a subsequent operating cycle of the test valve before resuming the testing operation.

REFERENCES:
patent: Re29638 (1978-05-01), Nutter
patent: 4113012 (1978-09-01), Evans et al.
patent: 4440230 (1984-04-01), McGill
patent: 4509604 (1985-04-01), Upchurch
patent: 4557333 (1985-12-01), Beck
patent: 4576234 (1986-03-01), Upchurch
patent: 4667743 (1987-05-01), Ringgenberg et al.
patent: 4711305 (1987-12-01), Ringgenberg
patent: 4753292 (1988-06-01), Ringgenberg et al.
patent: 4907655 (1990-03-01), Hromas
Pages for a publication entitled "DownHole Testing Services", Jan., 1987.

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