Downhole Systems for Detecting a Property of a Fluid

摘要

System, methods, and apparatuses for determining properties of a production fluid downhole are presented. In one instance, a system includes a sample-filled sensing device for vibrating a first suspended tube containing a sample of production fluid and producing a first response signal. The system also includes a reference-fluid sensing device with a second suspended tube containing a viscosity -tunable fluid therein. The system vibrates the second suspended tube to create a second response signal. The viscosity of the viscosity -tunable fluid is varied until it is deemed to match that of the sample production fluid. Other systems and methods are presented.

主权项

1. A downhole system for determining a fluid property of a production fluid in a wellbore, the system comprising:
a housing; a sample-fluid sensing device coupled to the housing, wherein the sample-fluid sensing-device comprises:
a first suspended tube for containing the production fluid, and first response-signal generator coupled to the first suspended tube for generating a first response signal, the first response signal representing a first parameter that is characteristic of the first suspended tube and the production fluid; a reference-fluid sensing device coupled to the housing, wherein the reference-fluid sensing device comprises:
a second suspended tube for containing a viscosity-tunable fluid, anda second response-signal generator coupled to the second suspended tube, the second response-signal generator for generating a second response signal representing a second parameter that is characteristic of the second suspended tube and the viscosity-tunable fluid; a viscosity-control device coupled to the viscosity-tunable fluid for manipulating a viscosity of the viscosity-tunable fluid; and an analysis unit coupled to the sample-fluid sensing device, the analysis unit further coupled to the reference-fluid sensing device, and the analysis unit further coupled to the viscosity-control device, the analysis unit comprising one or more processors and one or more memories, and wherein the one or more processors and one or more memories are operable to:
provide a first control signal to the first response-signal generator to control vibration of the first suspended tube,receive the first response signal and produce a first quality factor,provide a second control signal to the second response-signal generator to control vibration of the second suspended tube, receive the second response signal and produce a second quality factor,provide a viscosity-control signal to the viscosity-control device to manipulate the viscosity of the viscosity-tunable fluid, and compare the first quality factor and second quality factor and manipulate the viscosity-control signal until the second quality factor substantially equals the first quality factor.