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Morozov, Oleg Nikolaevich (LLC, Gazpromneft Shelf) | Andriyanov, Maksim Alexandrovich (LLC, Gazpromneft Shelf) | Ivlev, Mikhail Sergeevich (LLC, Gazpromneft Shelf) | Koloda, Alexey Vladimirovich (LLC, Gazpromneft Shelf) | Gabdullin, Aydar Razinovich (LLC, Welltec Oilfield Services, RUS) | Agadullin, Vadim Akramovich (LLC, Welltec Oilfield Services, RUS)
Abstract This article describes the implementation process for use of robotic equipment to perform production logging in extended horizontal production wells equipped with a Y-Tool bypass system. The article describes in detail the process of searching for technological solutions from bench tests to the introduction of technology in the field. The described technology allowed the Company to find a solution to work with the Y-Tool bypass system in the production wells of the Prirazlomnoye field.
The PDF file of this paper is in Russian. In connection with the high risks of emergencies in the operation of Arctic shelf deposits, an important task is to provide such facilities with effective and environmentally safe technologies for liquidating oil spills on the water surface. In this study, the effectiveness of the reagent - the oil encapsulator, which is a biopolymer and used as an aqueous solution - was evaluated. The physicochemical properties are investigated and the maximum oil capacity of the encapsulator is determined. As a test environment, sea water and oil from the Prirazlomnoye field were used. The effectiveness of cleaning the water surface from an oil film with an encapsulator in laboratory conditions at low temperatures is shown.
Summary Notwithstanding significant advantages of the oil-base mud systems, their application inherent in a number of disadvantages that have been primarily attributable to environmental restrictions. In 2017 AKROS LLC and GAZPROMNEFT ran full-scale field-testing of potassium and sodium formate mud systems enabling them to analyze the performance of such systems and define the key application features. Conclusions on the application features of these systems and their perspectives in Russia are based on the results of the work performed. To implement potassium and sodium formate drilling fluids in GAZPROMNEFT fields, the full-scale laboratory testing was performed. The outcomes enabled the identification of fluid formulations for field applications and procedures for the maintainance of mud properties when drilling. Two intervals on «Gazpromneft-Khantos»' LLCs Yuzhno-Priobskoye Field and three intervals on «Gazprom Neft Shelf» LLC's Prirazlomnoye Field were drilled with potassium formate-base formulations. Field testing proved the high efficiency of potassium formate mud systems allowing them to: –achieve high drilling performance indicators; –gain experience in horizontal well drilling without lubricating additives demonstrating loads and torques similar to or lower than values observed in mud systems treated with lubricants; –develop the procedure for interval treatment of a high-density drilling fluid; –confirm the possibility of achieving a high density up to 1.41 g/cm without barite; –implement the technology ensuring mitigation of environmental risks connected with drilling fluids; –drill horizontal section and production casing intervals using one type of drilling fluid instead of two, facilitating reduced waste and prepared volumes. The potassium formate mud system proved to be efficient and has impressive perspectives in Russia as an alternative to oil-base drilling fluids, particularly for high formation pressure drilling. Based on field application results, practical application procedures and optimum recommendations for controlling mud properties were developed. Comparative tests for inhibition effectiveness, reducing friction factor, achieving high drilling performance were conducted.
Koloda, Alexey (Gazprom Neft Shelf) | Morozov, Oleg (Gazprom Neft Shelf) | Andriyanov, Maksim (Gazprom Neft Shelf) | Kuntsevich, Vitaly (Gazpromneft NTC) | Mukhametshin, Ilkam (Resman) | Galimzyanov, Artem (Resman) | Nukhaev, Marat (Siberian Federal University)
The key features of the shelf fields are high costs and limited space to place the equipment. The field devepment plan should ensure high recovery factors with the relatively small number of production wells within the short period of time. The main factor to achieve the planned oil recovery factor is implementation of new technologies and approaches in the advanced well completion, well stimulation, and the use of full field reservoir model to take the best effective decisions in the part of the existing and project wells focused to increase the technological and economic efficiency of the project. This work is devoted to the comprehensive approach to field development based on hydrodynamic and tracer studies, generalization of field-geological information and geological and hydrodynamic stimulation.
Serdyuk, Alexander (Rosneft) | Valeev, Sergey (Rosneft) | Frolenkov, Andrey (Rosneft) | Lushnikov, Alexey (Rosneft) | Overin, Alexander (Rosneft) | Yudin, Alexey (Schlumberger) | Kuznetsov, Alexander (Schlumberger) | Gorlushko, Anna (Schlumberger)
Abstract The Achimov formation in Western Siberia has considerable potential for oil production, but development of these hard-to-recover reserves often is not profitable. This paper focuses on successful experience of the Achimov development in the Prirazlomnoye field in Western Siberia, where a new technology of hydraulic fracturing was applied, which allowed us not only to increase the oil inflows, but also to significantly reduce costs of hydraulic fracturing. The main geological properties of the Achimov formation of the Prirazlomnoye field are high heterogeneity, high gross thickness (exceeding 100 m in some cases), and water-saturated layers in the bottom section. Under these conditions, the hydraulic fracturing design should provide effective inclusion of all sublayers; therefore, a significant amount of fracture materials is required. In addition, there should be a mechanism to prevent proppant settlement in the lower part of the fracture. Channel fracturing treatment made it possible to achieve significant progress in solving the problems of reservoir development in the Achimov. Due to the features of the technology, the required amount of proppant and fluid was minimized, thus reducing the cost of hydraulic fracturing. High concentrations of fiber material in the hydraulic fracturing fluid fixed the proppant in the upper part of the fracture, significantly reducing the water-cut of well products. The paper describes the details of the development of the Achimov on the Prirazlomnoye field using hydraulic fracturing. Statistical results show the optimal parameters of the hydraulic fracture. A comparative analysis of hydraulic fracturing using the standard and channel technologies was made. The well completion and production data from several pads were used, and a comparison was made of 47 wells that had channel technology applied with 39 offset wells fractured using standard technology. The average fracturing job size was more than 300 tons of proppant. The comparison reveals the advantage of a new method of fracturing on accumulated oil production (more than 10%); the increased production was mainly due to reduction of the water cut. At the same time, channel fracturing costs are lower by 12% compared to standard fracturing. Such a significant reduction in costs for large-tonnage jobs was achieved by decreasing of material volume for fracturing. The required proppant amount is decreased by 45% due to the specificity of the channel technology. In addition, due to the aggressive proppant concentration, increasing the volume of the required fracturing fluid is avoided, so costs for its delivery and heating are minimized. The application of the new fracturing technology significantly increased the profitability of the Achimov development. The Achimov formation has been well explored geologically, but there have been few projects that demonstrably increased the profitability of development of these hard-to-recover reserves. This paper presents in detail an effective method for increasing the economic component in the development of hard-to-recover deposits. The potential of the Achimov formation in Western Siberia is significant, and the experience of channel fracturing at the Prirazlomnoye field can be applied to many other oil fields due to the reliability and adaptability of this fracturing technology.
The PDF file of this paper is in Russian. RN-Yuganskneftegas LLC is the biggest oil-and-gas production department in Rosneft Oil Company. RN-Yuganskneftegas was found at 1977 and operates 26 oilfields located in Western Siberia. Major part of Yuganskneftegas' proved oil reserves are concentrated in the Priobskoye and Prirazlomnoye fields and these are green and strategical fields. In 2016 Well Construction Department initiated special project – well cycle reduction (for horizontal wells including wells with multi-stage frac). As a result of worldwide experience and searching of unstandardized decisions to reduce well timing Well construction department found new approach in designing. Our engineers found that extensive field data from wells drilled in the formation demonstrates possibility to optimize some operations by combining production section with horizontal one. The concept was named Dual-casing design. Combined interval should be drilled in one run. Once reaching TD tapered casing string should be run. In consequence of this approach – well timing of horizontal wells is 17 days Vs 30 days (per standard well). During the pilot project, 12 wells were drilled with a consequent optimization of the solutions as experience gained. The results of the experimental work were recognized as successful and a decision was made to replicate the technology for drilling on different oilfield. The article describes the features of drilling technology using optimized casing design with results and conclusions.
Abstract The vector of the oil and gas industry development shows an intensive increase of investments into drilling. Oil-based mud (OBM), in conjunction with new drilling technologies, which have recently been used primarily in complex wells and offshore, are now becoming an effective solution for mass drilling on land where existing technologies have already been developed and proved to be effective. Nevertheless, these decisions have reached their technological limit and do not allow to obtain the expected returns under the new conditions. OBM in addition to the unsurpassed drill-in quality, it allows keeping high borehole stability and drilling efficiency. Its advantage is the possibility of re-use and a minimum of wastes. In mass drilling, this reduces its cost and makes it competitive with WBM. This approach has a reverse side - with repeated use of the mud, a fine-solid phase accumulates and rheology grows up at each subsequent well. Control of these processes by standard solids control equipment is practically impossible, as it is impossible to remove the accumulated amount of colloidal phase by traditional mechanical method (centrifugation). An alternative, to some extent, allowing reducing it is dilution, which affects the volume and cost of the OBM. Currently, a new technology for recycling is the effective solution for controlling solid phase in OBM and the level of ecological danger of drill cuttings: combination of centrifugal drying system for drill cuttings and removal of the colloidal phase by a chemical-mechanical method using a high-performance centrifuge. This solution was implemented as a part of a campaign to drill horizontal wells of lightweight construction at the Prirazlomnoye field of OOO RN-Yuganskneftegaz. Optimizing the well design involves combining two intervals with different gradients of reservoir pressures and fracturing into one. In conditions of high rates of penetration and a requirement to have minimum operations for hole cleaning, this approach imposes significant restrictions on the operating range of equivalent circulating densities and requires careful planning of each element of the drilling system. The application of OBM allows ensuring stability of the wellbore and optimal conditions for operation of bottom hole assembly tools. A narrow range of operational ECD requires stable parameters of mud throughout the drilling process. The use of recycling technology has made it possible to achieve significant results: Significant decrease of low gravity solids content; Reduction of wastes to the pits; Solids control efficiency increase above 90%; Significant OBM cost reduction (more than 2 times). Stable mud properties while drilling when it is reused several times. The article describes solutions, achieved results and the way, how in the current conditions of increasing requirements to technology and the increase in the complexity of the wells, integrated solutions for OBM cleaning allow to provide technical, ecological and economic justification of using high-tech and expensive drilling fluids for mass drilling.
Morozov, O. N. (Gazprom Neft Shelf LLC) | Andriyanov, M. A. (Gazprom Neft Shelf LLC) | Koloda, A. V. (Gazprom Neft Shelf LLC) | Shpakov, A. A. (Gazprom Neft Shelf LLC) | Simakov, A. E. (Gazpromneft Science and Technology Center LLC) | Mukhametshin, I. R. (Resman Rus LLC) | Nukhaev, M. T. (Siberian Federal University Resman Rus LLC) | Prusakov, A. V. (RESMAN AS)
Summary This work describes the technology for inflow profiling based on the data from intelligent inflow tracers installed on production well completion elements at the Prirazlomnoye oilfield. Specially designed polymer matrices with tracers are installed at certain borehole sections depending on the well trajectory and the distribution of reservoir porosity and permeability. Individual sampling methodology and physical and mathematical model for tracing substance flushout and transportation are selected individually for each borehole and provide for not only qualitative but also quantitative inflow profile in the multizone horizontal well. The innovative technology described in this article helps solving tasks usually addressed by traditional well logging. This study discusses the experience of Gazprom Neft Shelf LLC in implementing stationary tracing monitoring technology for horizontal wells in the Prirazlomnoye field.
Serdyuk, A. N. (Rosneft) | Frolenkov, A. N. (Rosneft) | Valeev, S. V. (Rosneft) | Sitdikov, S. S. (Rosneft) | Shchekaleva, T. (Schlumberger) | Roukhlov, V. (Schlumberger) | Yudin, A. V. (Schlumberger) | Gromovenko, A. V. (Schlumberger)
Abstract The effective alternative method of multi stage fracturing stimulation of horizontal section of sidetracks completed with cemented liner and utilization of abrasive perforating technique started to be implemented in West Siberia for Priobskoe and Prirazlomnoe oil fields. The goal was to analyze all associated risks, make clear statistics and adjust it for specific oil fields for further implementation on a massive scale. Abrasive perforating is done through coiled tubing (CT) special downhole perforator that creates holes inside casing and caverns in nearwellbore zone by pumping sand slurry down CT string. After perforation has been done and the well has been stimulated with fracturing treatment, fiber-enhanced proppant plug is placed in order to isolate treated intervals. Adding degradable fibers to proppant plugs helps to achieve successful and efficient isolation between stages, while conventional proppant plugs are non-applicable due to gravity effects that cause settling of proppant and resulting in non-uniform proppant distribution and poor isolation efficiency. Extensive campaign was conducted in 2015 at Priobskoe and Prirazlomnoe oil fields, located in Khanti-Mansijsk region. The main challenge during all operations was to perform a successful bridging of wide hydraulic fractures. Different approaches to get isolation were used and the most effective variant is narrowly described. Also spacing and number of perforating stations were identified as critical parameter. First operational and wells productivity results look very promising and the technique was proven as a best option of multistage stimulation in short and slim sidetrack wellbores. Such sidetracks have been shown as efficient method to improve hydrocarbons recovery from mature fields. A comprehensive review of trial campaign with utilization of special technique is presented. Slim sidetracks can be stimulated with several stages in reliable, efficient and economical manner. Technology can be utilized for other brown fields in the region and outside Russia.
Toropov, K. V. (Rosneft Oil Company PJSC, RF, Moscow) | Sergeichev, A. V. (Rosneft Oil Company PJSC, RF, Moscow) | Murtazin, R. R. (RN-UfaNIPIneft LLC, RF, Ufa) | Nesmashnyi, E. A. (RN-Yuganskneftegas LLC, RF, Nefteyugansk) | Mitin, A. V. (Weatherford LLC, RF, Moscow) | Gordeev, R. K. (Weatherford LLC, RF, Moscow)
The pdf file of this paper is in Russian. In 2016, RN-Yuganskneftegas LLC performed numerous surveys of various types in the areas developed by horizontal wells with multi-stage fracturing (MSF HW) including a series of downhole microseismic monitoring studies. Fracture propagation information obtained from downhole microseismic monitoring is of great interest due to the lack of alternate direct fracturing monitoring methods, and lack of similar studies in Russia. This paper presents the results of three microseismic investigations at Prirazlomnoye and Priobskoye fields. It demonstrates effectiveness and feasibility of commercial application of microseismic monitoring during fracturing aimed at optimization of horizontal drilling, fracturing designs and field development in general. Microseismic monitoring of fracturing operations in horizontal wells of Priobskoye and Prirazlomnoye fields enabled the determination of the actual directions of fracture propagation, achievable fracture sizes and interaction of fractures developing from neighboring frac ports. The first in Russia successful fracturing monitoring in two observation wells simultaneously was performed at Prirazlomnoye field, which enabled to increase the fracture mapping area and determine the significant influence of offset wells on the fracture pattern symmetry. Fracturing monitoring operations at Priobskoye field were record-breaking for Russia: over 1,200 microseismic events were registered and located during 5 fracturing stages. The paper also provides recommendations on the selection of optimum candidate wells, well preparation, and noise reduction for improved seismic data quality.