This reference is for an abstract only. A full paper was not submitted for this conference. Introduction Kamennoe field is one of the most valuable assets and one of the major development projects of TNKBP in Western Siberia. Most of the production in Kamennoe comes from the shallow VK formation of Neocomian age. Most of the reserves are attributed to the upper VK-1. Typically, the underlying VK-2 formation is water- saturated with a relatively weak barrier toward VK-1. Stimulation Practices Overview in Kamennoe Field, Western Siberia Hydraulic fracturing is being successfully used to uncover the reserves of Kamennoe field and sustain production growth. One of the major challenges is placing the desired volume of proppant into the target formation (VK-1) without breaking into the waterbearing VK-2 through the weak barrier. To address this challenge, the series of techniques has been successfully introduced to assist proppant placement into the target zone while reducing the risk of breakthrough:• artificial barrier placement• linear fracturing fluid at the pad stage (as opposed to conventional X-linked fluid) to reduce the net pressure developed during the fracturing treatment• low-viscosity viscoelastic surfactant fluid treatment. Modeling Approach Until recently, the hydraulic fracturing simulation model was based on a conventional set of logs (GR, SP, NKT, GZ, PZ, etc,) and the gut feeling of the engineer. Over time, we learned that such an approach can lead to an inadequate model that could overpredict the strength of the lower barrier and result in fracture breakthrough to the water zone (current breakthrough rate in the new pads is 32% based on 50% WC cut off, Fig.1). To address this issue, the advanced acoustic logging of VK formation in Kamennoe field was done by running DSI log in one well and waveform sonic logs in six other wells. Formation mechanical properties as established from acoustic logs, have been associated with lithofacies, based on the conventional set of logs and extrapolated throughout the field for further usage in simulation modeling. Fig.1 - Post-frac performance based on the conventional modeling approach approach, the advanced planar 3D hydraulic fracturing simulation was performed for the wells that showed no breakthrough based on conventional model (Fig.2), but that have been put on production with the postfracturing WC>50 % (Table 1). Table 1 - Production parameters of the well that did not show any breakthrough to VK-2 according to the conventional model. Fig.2 - Conventional model for the well 5485 does not show breakthrough to VK-2. Fig.3 - Planar3D model shows breakthrough. The fracture geometry obtained from the planar 3D model has been aligned with the postfracturing production results (Fig. 3). Second, the input for the conventional simulation was adjusted accordingly and the conventional model was put in agreement with the advanced model and postfracturing production results (Fig.4). Fig.4 - Conventional model aligned with the planar 3D simulation, and production results showing breakthrough. Third, the modified input for the conventional simulation is now being used routinely to model new fracturing jobs. Results As a result, the process developed on the basis of this study shows improvement in both geometry prediction accuracy and postfracturing water cut (Fig.5). Fig.5 - Post-frac performance based on the new modeling approach Conclusion Production water cut is one of the most important economic parameters of the Kamennoe field development project because of water lifting/handling cost in the environmentally sensitive area. The current study showed that the risk of breakthrough to waterbearing formations can be reduced by using advanced acoustic logging and fracturing simulation technologies in the high-profile development project. Acknowledgements Authors would like to thank TNK-BP and Schlumberger for permission to publish the paper and for continuous cooperation and knowledge sharing.
For the first time in horizons of Tumenskoe formations of Em-Egovskoe oilfield in Krasnoleninsky play of Western Siberia to achieve the maximum wellbore contact with heterogeneous multilayered formations the technology of multistage fracturing in horizontal well was used. It was a three staged fracturing job with use of coiled tubing to prepare well in between stages followed by well kick off and production start up. Paper describes the experience of challenges overcoming during the different stages of horizontal well architecture, principles of equipment selection and fracturing design. This particular work was in 2010 and originated the first brief into the time of multifracturing horizontal wells of Tumenskoe formations in Em-Egovskoe field, Western Siberia. Multistage fracturing in horizontally drilled well is one of the effective technological solutions for Tumenskoe formations in Em-Egovskoe field. Remoteness and not yet confident knowledge of pay zones at current stage of described field wittingly made the preconditions for selecting the cost effective well design to suit the productivity of the well. That pilot multistage fracturing project presented itself as practical and reliable method to stimulate the production in horizontal well in Tumenskoe formations of Em-Egovskoe field Krasnoleninsky play. With more experience in further use of this technology will allow keeping this drilling and completion method as economically effective in field of this subject. This paper showed the problems occurred during the well drilling stage those also some affect on the followed completion and fracturing operations. Technological solutions have been offered based on study in this paper for future wells. As result of the analysis and gained experience the recommendations are made to ease the construction of well as for example to use the liner wellbore design. A number of recommendations are made for fracturing and coiled tubing design, preparation, equipment availability and technological processes. Presented work preforms the hot topic of glimmering entry into massive multistage fracturing in formations of Bazhen-Abalak and Tumenskoe horizons in Western Siberia. The specifics of drilling and completion in horizontal wells are brought out based on described in paper geological conditions. Some trends and backgrounds were determined in study to achieve better efficiency in fracturing and coiled tubing operations for targeted formations.
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