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Working Mothers

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Eldar Matveyev
Eldar Matveyev

Cerberus Wireline Software ~UPD~



In a well logging operation (see FIG. 1), a toolstring including one or more tools is lowered into a borehole on the end of a cable (wireline) which connects the tool to an acquisition system at the surface and provides power and/or data from the surface. Once the tool reaches the bottom of the borehole, it is then raised to the surface while measurements are made on the formation or in the borehole. The cable is provided on a winch drum (not shown) in the surface unit and the depth of the tool in the borehole is determined by measuring the amount of cable entering or leaving the borehole by means of a measurement wheel that is displaced somewhat from the cable drum.




Cerberus Wireline Software


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In wireline logging, measured depth (that is, the position of the logging tool measured along the borehole) is often considered to be the most important measurement that is made. For example, logs from different wells in the same field are often depth-matched in order to determine the extent, and varying thicknesses, of the hydrocarbon-bearing zones. Any errors in the depth measurements made during data acquisition may thus affect significantly the subsequent interpretation of the data.


Wireline logging cables are somewhat elastic (that is, their length changes with tension) and are also subject to temperature dilation (that is, their length changes with temperature). At present the only robust depth measurement made during wireline data acquisition is made by measuring the movement of the logging cable at surface conditions, typically by measuring the rotation of a calibrated wheel pressed against the cable. Perhaps surprisingly, this measurement automatically takes into account much of the effect of cable stretch due to varying tensions.


The user enters a description of the wellbore environment and the toolstring and cable being used to log the well. The software discretises the wellbore into short sections, and then, for each possible tool depth, it computes the tension profile along the cable from the tool to surface.


The software for implementing a method according to the invention can take a two-stage approach. In the first stage, the tension in the cable is determined for each position of the tool in the well. In the second stage, the stretch of the cable is computed according to the determined tensions. In both stages, the parameters discussed above are used to allow the software to perform the calculations.


Our custom software packages help identify and interpret the stimulation treatments of any problems faced by the wells. WEAFRI owns various such packages for well performance analysis namely, Cerberus (Coiled Tubing Force Analysis, Down Hole Hydraulic Analysis), CT Modelling Suite, Prosper, FracPro, and Real-Time Data Acquisition System. Some of the main CT services offered are as follows;


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