METHOD FOR DETERMINING A POSITION OF A WATER/CEMENT BOUNDARY BETWEEN PIPES IN A HYDROCARBON WELL

摘要

A method has been disclosed for determining a position of a water/cement boundary in an annular area between two concentric pipes in a hydrocarbon well. The method comprises the steps of running a well tool (10) into a central pipe of the well, where the well tool (10) comprises a tool housing (11), a pulse generator (14) and a signal recorder (16) provided within the housing (11); generating an electromagnetic pulse by means of the pulse generator, thereby providing physical vibrations in the central pipe of the well; recording reflected acoustic signals from the well by means of the signal recorder (16); repeating the generating and recording steps for different vertical positions of the pulse generator in the well; organizing the recorded signals in a two-dimensional representation; filtering the organized recorded signals in order to identify, in the two-dimensional representation, a hyperbola (B); and providing an apex of the hyperbola (B) as the determined position of the water/cement boundary.

主权项

1. A method for determining a position of a water/cement boundary in an annular area between first and second concentric pipes in a hydrocarbon well, the method comprising the steps of:
a) running a well tool into a central pipe of the well which extends concentrically through both said first and second pipes, the well tool comprising a tool housing, a pulse generator provided within the tool housing, and a signal recorder provided within the tool housing; b) generating an electromagnetic pulse by means of the pulse generator to thereby create physical vibrations in the central pipe of the well; c) recording reflected acoustic signals from the well by means of the signal recorder; d) repeating steps b) and c) for different vertical positions of the pulse generator in the well; e) organizing the recorded signals in a two-dimensional representation; f) filtering the organized recorded signals in order to identify, in the two-dimensional representation, a hyperbola; g) designating an apex of the hyperbola as the determined position of the water/cement boundary.