Extreme GeoSteering in Complex Channel Sand Architecture, a Reality Now With High Definition Deep Directional Multi Boundary Detecting Technology: Case Study from Greater Burgan Field, Kuwait
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Successful Field Development Strategies to Sustain Long Term Oil Productivity in Giant Sabriyah Carbonate Mauddud Reservoir: Case Study
Mauddud reservoir in Sabriyah field is a giant heterogeneous carbonate reservoir discovered in 1950s. The field is on production since 1957 with natural depletion since it has no aquifer support. Overtime, with continuous production there has been a decline in reservoir pressure which affected the field productivity. This paper presents successful field development strategies on multi-discipline approach, integrating sub-surface domains through comprehensive planning studies and high end geo-steering technologies with objective to arrest the pressure decline and sustain oil productivity from the Sabriyah Mauddud giant carbonate reservoir. For optimum exploitation of giant Sabriyah Mauddud reservoir, KOC is currently performing high volume producer and injector horizontal wells drilling campaign. Meticulous predrill planning integrated with advance geo-steering technologies such as Multiple Bed Mapping Distance to Boundary (DTB), Azimuthal Density and Ultra High Resolution Resistivity Image helped KOC to get best results from horizontal wells, not only in short term, but more importantly long term. An effective horizontal well would minimize amount of attic oil, delay water production and hence increase ultimate reservoir recovery. To reduce overall well cost, minimize well bore instability and maximize well production, a very innovative strategy was adopted to drill medium radius 8.5" curve sections with high dog leg severity using special drilling technologies. The Mauddud reservoir varies in property and thickness in different segments of the field, therefore tailored-to-fit drainholes strategies were adopted to exploit the massive Sabriyah carbonate reservoir efficiently. The new strategy of high dog leg medium radius ensured footage reduction by almost 50% in build section. Lower inclination through top shale sections ensured better wellbore stability and smoother drainhole. Reduction in footage meant the curve sections were drilled in less than 48 hours in a single run and resulted in huge cost savings. Another major achievement of this strategy was that landing point was positioned closer to mother bore (for sidetrack) because of reduced horizontal displacement by approx. 60%. After implementing drainhole strategies tailored to address unique challenges of particular segment of the field, horizontal producer and injector wells were successfully placed on top and bottom part respectively of Mauddud reservoir with desired exposure length, resulting in maximum reservoir contact and minimize water coning. An overall improvement of 30% in production rate and maintained water cut rate recorded on applied horizontal well case studies compared to non-horizontal wells. Consistent application on these field development strategies would be beneficial in long term by achieving increase of ultimate field recovery. This paper provides insight on successful application of innovative field development strategies to optimize production from Sabriyah Mauddud reservoir. Field specific development plans along with innovative landing strategy and proactive geo-steering with multi boundary mapping along with high resolution resistivity imaging tools minimize geological risk and helped to achieve horizontal well and field development plan objectives. Similar approach can be adopted to sustain long term oil productivity from this type of complex carbonate reservoir.
Successful Field Development Strategies to Sustain Long Term Oil Productivity in Giant Sabriyah Carbonate Mauddud Reservoir: Case Study
Mauddud reservoir in Sabriyah field is a giant heterogeneous carbonate reservoir discovered in 1950s. The field is on production since 1957 with natural depletion since it has no aquifer support. Overtime, with continuous production there has been a decline in reservoir pressure which affected the field productivity. This paper presents successful field development strategies on multi-discipline approach, integrating sub-surface domains through comprehensive planning studies and high end geo-steering technologies with objective to arrest the pressure decline and sustain oil productivity from the Sabriyah Mauddud giant carbonate reservoir. For optimum exploitation of giant Sabriyah Mauddud reservoir, KOC is currently performing high volume producer and injector horizontal wells drilling campaign. Meticulous predrill planning integrated with advance geo-steering technologies such as Multiple Bed Mapping Distance to Boundary (DTB), Azimuthal Density and Ultra High Resolution Resistivity Image helped KOC to get best results from horizontal wells, not only in short term, but more importantly long term. An effective horizontal well would minimize amount of attic oil, delay water production and hence increase ultimate reservoir recovery. To reduce overall well cost, minimize well bore instability and maximize well production, a very innovative strategy was adopted to drill medium radius 8.5" curve sections with high dog leg severity using special drilling technologies. The Mauddud reservoir varies in property and thickness in different segments of the field, therefore tailored-to-fit drainholes strategies were adopted to exploit the massive Sabriyah carbonate reservoir efficiently. The new strategy of high dog leg medium radius ensured footage reduction by almost 50% in build section. Lower inclination through top shale sections ensured better wellbore stability and smoother drainhole. Reduction in footage meant the curve sections were drilled in less than 48 hours in a single run and resulted in huge cost savings. Another major achievement of this strategy was that landing point was positioned closer to mother bore (for sidetrack) because of reduced horizontal displacement by approx. 60%. After implementing drainhole strategies tailored to address unique challenges of particular segment of the field, horizontal producer and injector wells were successfully placed on top and bottom part respectively of Mauddud reservoir with desired exposure length, resulting in maximum reservoir contact and minimize water coning. An overall improvement of 30% in production rate and maintained water cut rate recorded on applied horizontal well case studies compared to non-horizontal wells. Consistent application on these field development strategies would be beneficial in long term by achieving increase of ultimate field recovery. This paper provides insight on successful application of innovative field development strategies to optimize production from Sabriyah Mauddud reservoir. Field specific development plans along with innovative landing strategy and proactive geo-steering with multi boundary mapping along with high resolution resistivity imaging tools minimize geological risk and helped to achieve horizontal well and field development plan objectives. Similar approach can be adopted to sustain long term oil productivity from this type of complex carbonate reservoir.
High Definition Reservoir Multi Boundary Mapping Delivered Highly Productive Horizontal Well in Challenging Clastic Reservoir and Faulted Area
With the advent of new age real time drilling technologies, the amount of data generated downhole has increased tremendously. Complemented by superior telemetry, the ability to transfer data uphole has increased by many folds too. With the introduction of new generation geosteering and reservoir mapping applications, it is possible now to integrate conventional logs with deep directional electromagnetic resistivity and advance formation evaluation measurements for accurate bed mapping, real time assessment of reservoir quality, structural dip calculation and forward planning trajectory – all in an integrated and single platform. The result is informed decisions and highly optimized results. The paper will discuss on a case study using this innovative integrated platform where geologists, drillers and geosteering engineers worked in sync to come up with the best possible real time decisions for optimum well design and placement, in a clastic reservoir, reducing overall well construction risks and negotiating the challenges of undesired geological events like trajectory drilling through a fault. The interpretation of deep directional electromagnetic propagation measurements via highly sophisticated inversion algorithms gives information on the spatial position of the wellbore w.r.t reservoir boundaries. The remote detection of boundaries up to 20 ft around wellbore, gives us the edge for trajectory forward planning by predicting upcoming structural trend, in other words called Proactive GeoSteering. Conventional logs combined with high end measurements like spectroscopy, sigma, source less density and neutron provide accurate real time formation evaluation while drilling which enhance decision making of geo-steering process. Availability of these high-end technologies would allow operators to place horizontal well as close as possible to top reservoir, optimizing long term well performance by minimizing attic oil and delay water production. The case study represents how latest state of the art real time drilling technologies coupled with advance geosteering techniques successfully helped overcoming various geological uncertainties encountered while drilling a horizontal well. Unexpected minor sub-seismic fault was successfully mitigated which avoid undesired non-productive time and lost productivity of the well. The results were very encouraging in terms of well production, and optimum placement of the horizontal well which will enhance long term recovery. This paper provides new insight on successful application of multi boundary mapping technique in optimizing well placement in top part of the reservoir and offers approach for drilling horizontal wells in similar case of complex clastic reservoir. The technique also discusses mapping of sub-seismic faults that cannot be identified by normal seismic data, and how to mitigate subsequent risk of the fault.
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