Remote geosteering can be used to drill horizontal wells in large resource plays tapping reservoirs with monotonous lithology (silt and shale) with good well control and existing in-depth knowledge of reservoir characteristic from previously drilled stratigraphic wells. Examples of such resource plays include the Duvernay, Montney and Horn River/Muskwa.
The goal of geosteering is placing the wellbore in optimal position within the reservoir. Optimal position can target ideal drilling targets within the reservoir (maximising drilling efficiency), best placement for completion (targeting beds that support best fracking efficiency) and ultimately improving production of individual wells and of the resource play as a whole.
Real-time data relay from the wellsite has become increasingly robust and extremely reliable over the last decade. Geosteering geologists acquire continuous drilling and MWD parameters to decide the optimal steering direction in real time, from any distance. Decisions are then instantly relayed to directional drillers.
Employing geologists with extensive wellsite experience is a key factor for an efficient remote procedure system, and one of Chinook’s specialties. The vast majority of our geosteering geologists are former wellsite geologists themselves, intimately familiar with all rig operations.
Cuttings samples are collected at the wellsite using semi-automated sample catching systems that require minimal supervision, and the samples can be prepared and described at a later time in a laboratory environment. For in-depth analyses, critical samples can be collected and preserved in geo-jars and gas samples can be harvested in iso-tubes and preserved for subsequent analyses. Petrographic studies can be subsequently performed on collected drill cuttings samples.
Assessing the trajectory of the well path is the single most important aspect of geosteering, whether onsite or remote. This is done by following established procedures and protocols including:
In many respects, geosteering is equivalent to reverse geomodeling. By applying geosteering observations, a detailed model of the reservoir can be created while drilling. Such observations can be used to better understand the geological structure, pick optimal drilling windows or establish optimal placement of fracking stages.
Advanced geosteering allows for:
Other aspects of the drilling process are observed and can be optimized using geosteering procedures. These include:
Continuous communication with multiple disciplines is paramount for a successful geosteering operation. Real-time data flow and rapid interpretation of field data can dramatically increase the efficiency of the drilling operation and ultimately increase production.