Application of horizontal multiple-stage fracturing is becoming the standard completion technique for oil and gas developments both in shale and tight sands. This technology has proven to be a game-changer within the US oil and gas industry to the point of creating an oversupply of gas in the US. Predictions indicate that the supply of oil related to this technology could allow the US to become self-sufficient within the decade. Globally, shale and tight-sand exploration activities are also increasing. This concept was successfully suited for and applied within a Russian tight-oil play in the Em-Egovskoe license area in western Siberia.This paper provides the case history of how a horizontal multiple-fracturing completion methodology helped unlock the potential reserves in the western Siberian Em-Egovskoe tight oil field. This very heterogeneous and lenticular sand oil play was known for years for its complexity and arduous nature. The completion technique employed a proven North America multiple-stage fracturing technique using a combination of swellable packers and sliding-sleeve frac ports. The fracturing design for the Em-Egovskoe field is discussed. This design is an adaptation of an alternating hybrid fluid system composed of proppant slugs during the pad stage and a high-concentration proppant ramp in the main frac stage.The well is currently flowing at commercial rates synonymous with early production in a typical North American oil shale well. The various monitoring techniques for measuring fracturing efficiency are also discussed. A production curve fit analysis using early production data allowed the operator to evaluate how the project was being commercially realized. Results and recommendations are presented.
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.
Slugs-fracs is one of new-to-field approaches which changed the conditions of wells for fracturing increasing the number of candidates in Kamennoe field Western Siberia. Placing fracturing jobs by slugs of proppant pumped in linear gel successfully implemented in stimulating pay zones in near water intervals with small stress contrast between zones and barriers. A few technical specifics had been used to contribute the success of this methodology such as earlier pumping with near matrix rate to allow more fluid filtration ahead of the main proppant stages before fracture is fully formed. Proppant setting according to Stokes law and dune effects theory were evaluated and considered for design strategy. The slugs-fracs allowed pumping regardless of the wellbore deviation and height of perforated intervals. Post-fracturing results from 120 wells were used for analysis. Significant decrease in initial water cut and sustainable oil production were reported. First slugs-fracs were introduced in the beginning of 2010 and in following 2 years more than 200 hundreds jobs have been pumped across the field. This allowed to drill spots of the field that were previously suspended as result of ineffective fracturing treatments mostly due to high risk of fracture breaking down the water zones.
Application of horizontal multiple stage fracturing is becoming the standard completion technique for oil and gas developments both in Shale and Tight Sand. This technology has proven to be a game-changer for the United States oil and gas industry to the point of creating an oversupply of gas in United States. Predictions indicate that the supply of oil related to this technology could allow the United States to become self-sufficient within this decade. Globally, shale and tight sand exploration activities are also increasing. This concept was successfully suited to one of the Russian Tight Oil plays within the Em-Yoga license area in Western Siberia. This paper provides the case history of how horizontal multiple fracturing completion methodology helped to unlock the potential Western Siberian Em-Yoga Tight Oilfield. This very heterogeneous and lenticular sand oil play was known for years for its complexity and arduous nature to extract oil from. The completion technique employed the proven North America multiple stage fracturing using a combination of swell-able packers and sliding sleeve frac ports. The fracturing design for the Em-Yoga field will be discussed in this paper. This design is an adaptation of an alternating hybrid fluid system composed of proppant slugs during the pad stage and a high concentration proppant ramp in the main frac stage. The well is currently flowing at commercial rates synonymous with early production time in a typical North American oil shale well. In this paper, the authors describe the various monitoring techniques of how fracturing efficiency was measured. Earlier production allowed providing of fit curve production analysis to evaluate how the project is being commercially realized.
This paper is based on study of formations in Bazhenov and Tyumenskoe horizons of Em-Yoga field Krasnoleninsky arch West Siberia with the aim of defining the geomechanical concepts of studied area. Hydrocarbon production from Bazhenov and Tyumenskoe formations in West Siberia is actually established through number of pilot wells with production testing. Economic profitability of producing wells depends on the efficiency of hydraulic fracturing in cases where the technology is predefined by reservoir development project. This article describes the principles and prerequisites of hydraulic fracturing mechanics under geomechanical conditions of the studied rocks. Tyumenskoe and Bazhenov formations are dated to Upper and Middle Jurassic geological time. Geological depositional environment and posterior transformations in time have created specific conditions for rock geomechanics. Rock mechanics in studied formations practically predetermines the concept of how rock is fractured. This work presumes basis for typification and description of fractures occurred naturally and created as a result of hydraulic fracturing and how those interfere with each other. This work is stand on the accumulated results of the ongoing study and actual data from producing wells in Em-Yoga field Krasnoleninsky arch West Siberia. The Jurassic rocks studied in this article are stratigraphically divided into formations of Tyumenskoe, Abalak and Bazhenov horizons. Enacted stratigraphic cross-sectional classification describes the formations of Tyumenskoe horizon as porous rock, Abalak horizon as cavernous-porous naturally fractured and Bazhenov as naturally fractured and micro-porous types of rock.
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