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Collaborating Authors
Innovative Geomechanical Approach Lead to Successful Drilling of the First Highly Deviated Well at the Kruzenshternskoe Field
Zadvornov, Dmitriy Alexeevich (Schlumberger) | Grachev, Oleg Valeryevich (Schlumberger) | Maximov, Danil Alexandrovich (Schlumberger) | Pekshev, Dmitriy Vasilievich (Schlumberger) | Korelskiy, Evgeny Pavlovich (Schlumberger) | Pavlov, Valeriy Anatolievich (Schlumberger)
Abstract In this paper, we describe the use of an innovative approach in the preparation process of the input log data for predrill geomechanical modeling, as well as real-time wellbore stability model update during drilling. The paper presents the methodology and justification of the solutions found to restore the missing data in "slow" formations with low values of the speed of passage of acoustic waves at shallow depths for geomechanical modeling, detection and prevention of risks during well construction. In the context of the "slow" formations at shallow depths (up to 1200-1400m TVDSS in the Yamal region), as well as logging tools restrictions, it is often impossible to detect shear acoustic waves, which, along with the compressional acoustic wave and other log data is also necessary for geomechanical modeling. Given these circumstances, and due to the inability of recording full-wave wireline acoustic logging conducting geomechanical modeling for the upper sections of the well is very difficult. Based on the analysis of acoustic logging data in the Yamal region, we have managed to build a regional dependence of compressional and shear acoustic waves and generate synthetic recovery of the shear wave velocities in the zones of missing data, which has been confirmed by the actual loging while drilling data. The result of the discovered regional dependence of compressional and shear acoustic waves was the restoration of the missing portion of the upper interval logging that has allowed to carry out predrill geomechanical wellbore stability calculations in the absence of the necessary log data. Because of predrill geomechanical modeling during project preparation for the construction of the well it became possible to substantiate the need for adjustments in the project documentation regarding the use of project specific mud weights. According to this model, significant collapse of the borehole wall was possible in the case of expected design specific mud weights. Thus, the specific mud weight have been significantly adjusted for each section. The resulting dependence has also been used during the drilling process, in the cases when it was not possible to obtain correct shear wave velocity logging data due to external factors. These adjustments to the drilling program on the stage of well design, combined with the early identification and prevention of drilling risks based on constantly updated geomechanical model played a key role in the accident-free drilling of the first directional well with inclination angle of more than 70 degrees in the field. The experience and achievements have also been used in a number of similar projects in the Yamal region, where it was possible to get a satisfactory convergence of the reconstructed and actual data, which enables the use of findings on the other projects of Yamal region.
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.46)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Seismic Processing (0.55)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.55)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > West Siberian Basin > South Kara/Yamal Basin > Kharasaveyskoye Field (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > West Siberian Basin > South Kara/Yamal Basin > Bovanenkovskoye Field (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > West Siberian Basin > Kruzenshternovskoye Field (0.99)
Best Practice of Horizontal Well Construction Operations for the Challenging, High-Pressure Achimov Formation โ Urengoyskoe Field
Dobrokhleb, P.. (Schlumberger) | Ablaev, A.. (Schlumberger) | Chetverikov, D.. (Schlumberger) | Zavarigin, S.. (Schlumberger) | Inyushina, A.. (Schlumberger) | Petrakov, Y.. (Schlumberger) | Sobolev, A.. (Schlumberger) | Zadvornov, D.. (Schlumberger) | Tarasov, O.. (JSC Arcticgas) | Milushkin, A.. (JSC Arcticgas) | Milenkiy, A.. (JSC Arcticgas) | Grigoryev, M.. (JSC Novatek) | Sidorov, D.. (JSC Novatek)
Abstract Achimov deposits extend over 12,000 square kilometers around the city of Novy Urengoy. These deposits are characterized by high reservoir pressures, and a narrow range of drilling fluid densities that creates complicated conditions for drilling and completion of wells. Due to the high accident rate of drilling horizontal wells only S-shape wells were drilled for this formation. The first successful horizontal production well was drilled in 2013 in cooperation Arcticgaz, ERIELL, Schlumberger. The first well to drill a horizontal wellbore on Achimov formation, has been planned to open Ach3,4 and Ach5 layers of Achimov formation. In close cooperation with project operator - Arcticgaz company, engineering group of Schlumberger drilling contractor and drilling contractor developed and successfully implemented comprehensive solutions for drilling and completion of horizontal wells Achim. One of the key factors of success was the use of drilling muds Megadril-D with constant control of equivalent circulating density. Application of rotary steareable system with optimally balanced PDC bits, allowed to drill horizontal wells through Achimov deposits in record time. An additional factor for drilling risks reduction was implementation of geomechanic model, as in the preparation of the preliminary model and real-time control for wellbore stability with the latest technology logging measurements (LWD) โ acoustic and density neutron formation properties. In the period for 2013 to the 2nd quarter of 2014 have been successfully constructed more than 10 similar wells. Esteblished new records: maximum closure โ 2403 meters, the length of the longest subhorizontal section reached 1233 meters. Set a record duration of well construction time of 62 days vs 100 planned, which could not been reached before by anyone in the region (formerly similar wells with shorter intervals of subhorizontal sectionhave been constructed in evarage about 150 days). Recently were successfully run two completion liners for 3-stage hydraulic fracturing (MSF) and one of MSF was successfully done. For completion purposes was used OBM with the weighting agent of mikro size, provided an unprecedented stability to settlement for a long time. This article devoted to the description of technologies and solutions that have been used for the construction of sub-horizontal wells. Preliminary production index of subhorizontal wells shows that current PI higher than S-shape wells (even with frac). Positive experience in the construction of subhorizontal wells change plans to develop Achimov deposits and opens new perspectives of hydrocarbon production in the region.
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block V > Urengoyskoye Field > Achimov Formation (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block IV > Urengoyskoye Field > Achimov Formation (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block 5A > Urengoyskoye Field > Achimov Formation (0.99)
- (2 more...)
Entering the Arctic Gate: High End Drilling at the High Latitude
Rakhmangulov, Rustam (Schlumberger) | Evdokimova, Inna (Schlumberger) | Dobrokhleb, Pavel (Schlumberger) | Chettykvayeva, Kamilla (Schlumberger) | Zadvornov, Dmitry (Schlumberger) | Kretsul, Vyacheslab (Schlumberger) | Borodai, Alexey (JSC, Yamal LNG) | Ageeva, Ekaterina (JSC, Yamal LNG) | Gulov, Artur ( CJSC, Investgeoservis) | Zhuravchak, Vladimir ( CJSC, Investgeoservis) | Zhludov, Alexey ( CJSC, Investgeoservis) | Novikov, Sergey ( CJSC, Investgeoservis)
Abstract South-Tambeyskoye gas-condensate field, located in the north-east of the Yamal Peninsula was discovered in 1974. Project, which started in late 2013, is currently operated by JSC "YAMAL LNG". The field consists of 5 shallow gas reservoirs and 37 deep gas-condensate reservoirs with the depth variations from 900 m to 2850 m TVD. The proved and probable reserves of the South-Tambeyskoye field are estimated at 926 billion cubic meters of natural gas. The field development plan stipulates drilling of 208 directional production wells with horizontal completion and length of horizontal sections exceeding 700 meters from 19 well pads until 2021. Liquefied Natural Gas (LNG) plant will start production in 2017 and reach its full capacity in 3 stages. LNG will be exported through the seaport facility. Specially designed for the project, 15 LNG icebreaker tanker, each of which has a capacity of 170,000 cubic meters, will ship the LNG to international markets.[1] Located far above the Arctic Circle, the region is ice-bound for seven to nine months during the year and isolated from the oil and gas infrastructure. Due to stringent deadlines, extreme weather conditions and lack of existing infrastructure only reliable companies with the leading technologies and expertise were involved in the drilling campaign. Detailed planning, well-coordinated interaction among the participants, and new technologies guaranteed a successful start of the project and provided accident-free implementation of drilling plans. By a joint effort of field operator, drilling contractor and oilfield service company a new Drilling System was designed, which included a full range of engineering solutions and technologies for efficient and failure-free construction process. The system allowed implementing best practices of directional drilling, bits, drilling fluids, as well as effective utilization of geomechanics and geosteering. Rotary steerable systems (RSS), oil-based mud (OBM) and advanced logging while drilling (LWD) technologies combined with continuous drilling optimization process allowed to significantly reduce well construction time. LWD tools eliminated the number of wireline runs providing equal log quality to G&G department. Application of geosteering in conjunction with formation boundaries detecting tool provided vital information while drilling and ensured maximum contact of the wellbore with the reservoir. Real-time geomechanics and trajectory optimization process joined with the best drilling and tripping practices significantly reduced risks associated with drilling process. Special attention was paid to the well construction time: apart from the aiming for the fastest rate of penetration (ROP), flat time was also reduced by optimizing full operational process: the number and frequency of wiper trips was revised, unproductive time due to the failures was minimized. Currently, drilling of each section is performed in one run. Further optimization plans include application of invert emulsion mud with the ability to change the type of emulsion for completion purposes. This approach will ensure better drill-in quality and increase productivity of the wells. In order to reduce well position uncertainties associated with the azimuth errors while drilling at high latitudes, geomagnetic referencing service will be provided [2]. The service includes development of precise 3-D magnetic model for the field and constant monitoring of the earthโs magnetic field variations by the magnetic observatory. Advanced wellbore surveying will minimize geological uncertainties and well-to-well collision risks.
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug (1.00)
- Asia > Russia > Ural Federal District > Tyumen Oblast > Yamalo-Nenets Autonomous Okrug (0.24)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.47)
- Geophysics > Magnetic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > West Siberian Basin > South Kara/Yamal Basin > Yuzhno Tambeyskoye Field (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Gulf of Ob > West Siberian Basin > South Kara/Yamal Basin > Yurkharovskoye Field (0.99)
- Well Drilling > Well Planning > Trajectory design (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Gas-condensate reservoirs (1.00)
- Facilities Design, Construction and Operation > Natural Gas Conversion and Storage > Liquified natural gas (LNG) (1.00)
Abstract The Achimov oil and gas bearing formation is encountered in nearly the entire West Siberian basin. These sandstone reservoirs form multiple lens-like structures. More than 100 oil, gas, and condensate deposits were discovered in the Achimov formation. Many of them huge, and the one located in the Samburg-Urengoy zone is enormous. There are gas and gas-condensate bearing formations within the upper Achimov interval; some Achimov operators also have encountered the oil-rims in the lower Achimov layers. The formations have sandstone beds with shale interbeddings. Even though a shale layer divides oil from water, it is not hydrodynamically isolating the layers over most of the field. The underlying waters limit the possibility of fracturing completions in the lower Achimov formation. Thus, the primary focus has been on the development of the cost-effective and innovative drill-in and clean-up optimization techniques to improve horizontal well performance. A properly designed reservoir drill-in fluid and precise control of its properties are essential to drill and complete horizontal wells and prevent formation damage issues that hamper production. Key requirements, application criteria, design decisions, advantages and limitations, main features and field application results are analyzed based on Urengoy field. Extensive lab testing, computer modeling, and hydraulics simulations were performed to consider temperature and pressure conditions of the Achimov formations. The main features of developed oil-based drill-in fluid (OBM) formulation are discussed with respect to local field and reservoir specifics, including wellbore stability, equivalent circulating density (ECD) management, and reservoir damage. The large-scale implementation of OBM fluids in the Yamal region is an ongoing, unique project with an extensive amount of lessons learned and "now how" technologies included from an engineered drilling system approach [7, 27]. The OBM application experience explained in the paper provides assistance to other companies working in West Siberia; details explaining how the planning and executing the Achimov development with drilling of horizontal wells and simplify OBM application led to success. This paper discusses the upfront assessment process, the OBM system, the chemistry, and subsequent optimization of drilling practices to achieve the drilling and completion objectives in Achimov formations of the Greater Urengoy fields.
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Samburgskiy License Area (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block V > Urengoyskoye Field > Achimov Formation (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block IV > Urengoyskoye Field > Achimov Formation (0.99)
- (6 more...)
- Well Drilling > Pressure Management > Well control (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Drilling > Drilling Fluids and Materials > Drilling fluid selection and formulation (chemistry, properties) (1.00)
- Well Drilling > Drilling Fluids and Materials > Drilling fluid management & disposal (1.00)
Drilling Record ERD Wells at Yamal Region
Glebov, Evgeny (Novatek) | Shokarev, Ivan (Novatek) | Boroday, Aleksey (Novatek) | Grigoryev, Maxim (Novatek) | Gulov, Artur (Investgeoservice) | Zhludov, Aleksey (Investgeoservice) | Chetverikov, Dmitry (Schlumberger) | Dymov, Sergey (Schlumberger) | Dobrokhleb, Pavel (Schlumberger) | Ablaev, Anton (Schlumberger) | Yakovlev, Alexander (Schlumberger) | Petrakov, Yuri (Schlumberger) | Sobolev, Aleksey (Schlumberger) | Korelsky, Evgeny (Schlumberger) | Zadvornov, Dmitry (Schlumberger) | Zavarygin, Sergey (Schlumberger) | Sulimov, Dmitry (Schlumberger) | Kuzakov, Vitaly (Schlumberger) | Alexandrova, Anna (Schlumberger) | Perkshev, Dmitry (Schlumberger) | Makhambetov, Amangeldy (Schlumberger) | Urmantseva, Lena (Schlumberger) | Leontyev, Dmitry (Schlumberger) | Belyaev, Aleksey (Schlumberger) | Shirshov, Anton (Schlumberger) | Shakirov, Eduard (Schlumberger) | Kovalev, Alexey (Schlumberger) | Gainullin, Marat (Schlumberger)
Abstract The interaction of NOVATEK, Investgeoservice (IGS) and Schlumberger allowed to deliver 2 complex extended reach wells (ERD), including the longest ever drilled in Russian mainland, well number 373, in the Yurkharovskoye field located in Arctic Yamal peninsula, as part of the offshore development plan from onshore locations. A geomechanical model was developed to address the main challenges, including optimum equivalent circulating density window and drilling regimes for wellbore quality and stability. Drilling & Measurements key technologies, multipole sonic-while-drilling, latest high-speed telemetry service, multifunction logging-while drilling technologies were used for real time Geomechanics service to prevent costly wellbore stability issues. In addition the combination of rotary steerable technology with customized polycrystalline diamond compact bits and drilling fluid system, delivered superior drilling performance, resulting in high performed drilling of these complex wells. Positive experience in the construction of these ERD wells, gives grounds to include options for developing the region, similar wells in the planning stage of various development scenarios. This article devoted to the description of technologies and solutions that have been used for the construction of these wells.
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Achimov Formation (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Gulf of Ob > West Siberian Basin > South Kara/Yamal Basin > Yurkharovskoye Field (0.99)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Pressure Management > Well control (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- (5 more...)