Method of identification of well damage and downhole...

Details Method of identification of well damage and downhole... Method of identification of well damage and downhole...

G - Physics

01

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324/39, 349/4

G01V 1/40 (2006.01) E21B 47/00 (2006.01) G01H 13/00 (2006.01) G01H 15/00 (2006.01)

Patent

CA 1316589

SFP/M-749 METHOD OF IDENTIFICATION OF WELL DAMAGE AND DOWNHOLE IRREGULARITIES Gary R. Holzhausen Gregory S. Baker Howard N. Egan ABSTRACT OF THE DISCLOSURE A method of testing a water or petroleum well to obtain information about well features, especially that part of the well beneath the ground surface, is described. The method is especially useful in detecting problems or irregularities in the well such as stuck tools, casing damage, damaged zones in an uncased well, or debris in a well. The method involves creating oscillations in the fluid pressure in the well. Transducers measure the pressure oscillations. The measured pressure oscillations are used to determine resonant frequencies. The measured resonant frequencies are used to determine the characteristic impedance and the depth of each reflector in the well, after removing resonances caused by known reflectors. It is then possible to determine the nature of each unknown reflector based on suspected problems or the well's operational history.

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