This paper presents a methodology for comparing conventional, primarily mechanically driven, detection sondes to the use of fiber optic cable via seismically generated sources through vertical seismic profiling (VSP). Ultimately we will demonstrate the two comparative methods, through the utilization of a hydraulic stimulation detection project.
Technical Paper that highlight OptaSense products and services.
This paper shares recent work that was done to understand how bulk flow rates and fluid composition may be derived in single-phase and multi-phase flow by tracking the slopes (velocities) of coherent features detected using Distributed Acoustic Sensing (DAS)
This paper shows a real data example where microseismic events were recorded using a 40 level array of 3-component downhole seismic sensors in an observation well straddling the treatment zone in depth. The observed microseismic event gathers exhibit shear wave splitting even at the onset of treatment operations due to anisotropy which was not readily predicted by either surface seismic or sonic scanner logs.
This paper describes how DAS measures acoustic events and signatures related to a typical plug-and-perf hydraulic fracturing operation including: wireline gun tracking, perforating, bridge plug setting, ball drops, and injection (axial flow and flow through perforations).
This paper presents the system architecture and details the lessons learnt in designing, commissioning and running a permanent DAS system including the extraction of low data rate, actionable, qualitative data from distributed fibre-optic sensors and the IT challenges of creating a reliable, permanently installed system.
This paper discusses the application of DAS for flow monitoring. Specifically, it was found that DAS has potential for zonal production and injection allocation across ICVs, monitoring interzonal inflow from the reservoir, monitoring artificial lift, tracking fluid transport through the well bore, detecting leaks, and monitoring wax build up or other types of deposition in the well.
This paper presents two recent examples of single-phase flow profiling using DAS. The first example is from a single-phase gas producer in one of the Unconventional plays in North America and the second example is from a long horizontal, smart polymer injector operated by Petroleum Development Oman (PDO).
This paper describes DAS technology and how it is deployed as well as shows the analysis and results from a casing leak detection trial.
This paper discusses the acquisition of a 3D Distributed Acoustic Sensing (DAS) VSP simultaneously in two injector wells in a deepwater field.
This paper presents details of the permanent downhole applications for DAS and provides case studies of how DAS is being used in time-lapse VSP and permanent flow measurements.
In this paper recent field trials are discussed to demonstrate the value of these novel in-well fiber optic applications. These trials highlight the benefit of integrated data interpretation and the versatility of applications that are possible using fiber optic installations in wells. The applications shown are the use of the DSS for inflow profiling in a water injector in a deepwater asset, gas flow monitoring by combined interpretation of DAS and DTS data, and the first offshore applications of DAS for borehole seismic in Shell.
This paper discusses the acquisition of downhole seismic with distributed acoustic sensing (DAS).