Research On Well Logging Cable Properties Testing Techniques

Armored loading detection cable is a well logging cable universally used in the oilfield atpresent, so the properties of the cable are the main factors that influence the quality of welllogging. It is necessary to make all the parameters being accuratly tested before it is put to useto asure the quality and for the quality-check department and the production process. Basedon the National standard for armored loading detection cable, methods for testing theproperties of the cable are analyzed and discussed, a set of testing procedure is set up.First, the relevant International Stands and their traceability for the main parameters ofthe well logging cable are discussed in the thesis. Then the overall testing scheme is designedand the testing procedure is analyzed. Based on the study of the properties of testing erro, erroprobability check and Chi-square check methods are proposed to asure the precision andscientific quality of the testing data. Finally, the testing methods and procedures ofmechanical and ecletrical properties of armored logging cable are discussed. The mechanicalproperties test includes the weight per unit length, density, tensile strength, elongation andhardness measurement, the test methods for those properties used in oilfield at present arefurther analyzed and discussed. The test for electrical properties includes the test for the basicparameters of the cable and its dynamic characteristics, the basic parameters of the cable arethe resistance, isolation and withstand of high voltage properties, the dynamic characteristicsincludes the frequency response characteristic of the cable. A frequency characteristics testscheme is proposed and the Multisim software is used to simulate the circuit diagram and theamplidude and phase response of the cable. The simulation result proved the validity of themethod.The test scheme designed in this paper has already been used by a testing project in theTest and Monitoring Station of Petroleum Machinary in Daqing. This has provided the basisfor armored well logging cable test, improved the working efficiency and quality of the testwork.