Browsing by Subject "drilling monitoring"

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Access status: Open Access ,
MUD LOGGING - a real time interconnection between geology and drilling
(2011) Ştefănescu, Dan-Paul; Vlasín, Ioana; Piteiu, Marcel A.
The final stage of geological research, which is in fact the essence of the exploration activity for discovering the new hydrocarbons accumulations, is actually represented by designing the new wells. For sure one of the main condition to achieve the proposed target could be considered the well monitoring. The implementation in Romgaz of the concept known as mud logging wasn't so easy. The beginning is related to the period 1989-1990, when the deepest well from Transylvanian Basin was drilled and the first mud logging unit was rented from the offshore Romanian company. After that successful experiment, few appraisal wells were monitored in this way, followed by more and more wells, so nowadays for each well there is a mud logging unit belonging to different drilling contractors or other services companies. In the last period, Romgaz set up a new department specially designed for mud logging supervising. The great advantage is represented not only by monitoring the drilling parameters (weight on bit, rate of penetration, rotary torque, pump strokes, the mud pit level, etc.) which allows to create a more accurate image of the well just from the drilling stage, but also by gathering a lot of geological data such as lithological description, calcimetry analyses, gas indicators and others, assuring in fact a maximum well security. All these information correlated with the borehole geophysics can identify the possible zones of interest for hydrocarbons accumulations and predict the well testing program and thus the future status of the well. Beside the short description of the main recorded drilling parameters and some aspects regarding the geological assistance, the case study presented in the paper highlights a very good correlation between drilling and geological parameters, open hole logs and the production tests. It's very obvious that diagrams provided by the mud logging services, including specialized devices and a competitive team, represent an accurate data base not only for the current well evaluation, but also for a better approach of the risk analyses in designing the new wells. For this reason, the mud logging service became a real necessity and represents in Romgaz a constant requirement for each new well.