The Sabiriyah Mauddud calcareous reservoir, located in North Kuwait is one of the major hydrocarbon assets in the country. A study was prepared in order to maximize production by implementing a multilateral, multi-zones well path. The paper discusses the methodology for the planning and execution of the first in its class Mauddud reservoir multilateral producer. This study illustrates the implementation of a unique approach for a challenging well design, including two lateral sections (L0 & L1) in a complex reservoir structure targeting multiple zones. Precise and continuous monitoring of the directional measurements was essential for the successful delivery of the mother wellbore, while fulfilling project constrains. The bottom hole assembly (BHA) used in the 6-1/8" horizontal sections was comprised of a rotary steerable system (RSS) with near bit gamma, azimuthal deep resistivity distance-to-boundary technology, and near bit density/porosity. Specialized software were used in creating geo-navigation models of the target reservoir zones. The real-time dynamic interpretation of the structure morphology was key in order to maximize exposure of the productive zones while minimizing the contact with non-productive zones. The openhole sidetrack technique for the startup of L1 involved a detailed procedure, and a special feature designed into the well plan to facilitate the sidetrack in the desired zone. Water based mud was used to optimize logging while drilling (LWD) measurements in order to clearly predict fractured zones, while mud weight recommendation and pressure hazard identification was based on geo-mechanical analysis. The well was successfully executed, tripling the production when compared to a single horizontal producer recorded in the same reservoir zones. The sidetrack procedure implemented allowed to initiate the drilling of L1 with the same bottom hole assembly (BHA) from L0 without pulling out of the hole, this approach considerably helped to save rig time. The positioning of the LWD sensors close to the bit significantly reduced the reaction time and minimized the challenges induced by sudden changes in reservoir properties. Similarly, the enhanced geo-navigation technique of integrating near bit density/porosity and the azimuthal deep resistivity distance-to-boundary technology played an important role in successfully navigating the wellbore within the multiple reservoir zones with confidence. This multilateral well has proven the concept of implementing shorter lateral sections to target multiple zones of interest, aiming for enhanced production when compared to projects with single longer laterals. The novelty of this work is the optimized methodology established for hydrocarbon extraction from a challenging reservoir. The implementation of these sidetrack procedures combined with enhanced geo-navigation techniques resulted in optimum well placement and the successful delivery of the first multilateral, multi-zones producer in North Kuwait.
Objective/Scope (75) Oilmen have always strived to break technological barriers to reach new heights in searching of Black Gold. In order to create an effort to do so has created world record by drilling the longest Slim Hole Horizontal section in of its deep development well in North Kuwait. The sick well lying dormant was completed as Horizontal Water Injector well through depleted Carbonate zone to augment reservoir pressure and increase oil production in producers. This re-entry well used Ultra Slim drilling technology in order to maximize oil production in the carbonate reservoir. The objective was to support the water injection campaign nearby producer wells in the eastern flank of the field. Limited slim hole logging tool without azimuthal capability and high expectation from client required extra control while drilling with precise geo-steering adjustment. Inability to transmit load during sliding due to sinusoidal buckling in long ultra slim hole, restricts penetration rate and pose challenges to maintain proper wellbore placement. Based on previous experience, we planned to drill this well in multiple runs. Methods, Procedures, Process (75-100) Geo-steering pre well modelling is required to be done prior to job execution. The application engineer also worked based on the offset well drilling data to optimize the bottom hole assembly. There was a concern regarding weight transfer, as Sinusoidal Buckling and the subsequent sliding issues are always difficult for this wellbore size. Ultra Slim Hole tool provides only gamma ray and resistivity logging while drilling tool with the current technology. Log responses incorporated with drilling dynamic and drilling parameters data in real time will be the source and justification for the wellbore placement. Results, Observations, Conclusions (100-200) Slim Hole Motor successfully drilled the long slim lateral section in one run only which otherwise required multiple runs in previous wells drilled by competitors. Despite the challenges, the logging tools allowed proper wellbore placement and wellbore was successfully maintained inside the target porous reservoir. 4.125inch Talon PDC bit endured drilling stresses and OBM helped reduce friction factor and minimize differential sticking while drilling. The well was successfully executed to total depth covered total footage of 4696 feet, making it the longest ultra slim hole horizontal well in the World. The single run job significantly reduced the drilling cost while drilling the Ultra Slim lateral section. The BHA achieved the required sliding capability to steer the well according to geological observations. The sinusoidal buckling concerns were overcome by finding the weak intervals of weight transfer in the BHA and mitigating them with continuously changing the BHA design by reshuffling the drill collars to get the required WOB. Novel/Additive Information (25-75) This will be the world longest Ultra Slim lateral section in single run with no failures.
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