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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.
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Drilling > Casing and Cementing > Casing design (1.00)
Influence of geological conditions on wear-out of the bits in the Riphean deposits of the Yurubcheno-Tokhomskoye field (Russian)
Pivovar, A. V. (IGiRGI JSC) | Kolesov, V. A. (IGiRGI JSC) | Kalistratov, S. A. (IGiRGI JSC) | Zagrivniy, F. A. (Vostsibneftegas JSC) | Mishakov, M. V. (Rosneft Oil Company)
When drilling wells on the Riphean deposits of Yurubcheno-Tokhomskoye field there occurs wear-out of the bits, that can be up to 10 bits for one well. However, there were examples when it was possible to drill a horizontal wellbore section in just 2-3 bits. The work performed on the bits selection didn’t allow finding a breakthrough solution, which would significantly reduce the wear-out of the bits on the study area. Alternative solution on reducing bit wear-out might be to predict zones with highly abrasive rocks in order to sink the operating wells outside of such zones, but not to the detriment of deposit development. The conducted comprehensive analysis of core data, well-logging, seismic data, well performance, geological and technological research and technical and technological support for well drilling made it possible to establish a connection between the seismic facies (chosen for geological drilling support) with the drill footage per one bit. It was found out that in low-amplitude seismic facies the average drill footage per bit is 48 % higher than in high- amplitude seismic facies (in average is 179 vs 121 m). The maximum average drill footage per bit values were achieved in the wells drilled in the zones of minor faults and fractures. The minimum average footage per bit was found in the zones of large disintegrations, cavernous porosity, leaching and cavern porosity, as well as in the zones of a relatively homogeneous dense section. The analysis of the average drill footage per bit according to the bit types showed that the best drilling results were achieved by PDC bits in the zones of minor faults, fractures and in the zones of large sections and paleo incisions developing along them. For these conditions multiple increase of drill footage is noted. In the zones of large disintegrations there is a slight advantage of roller-cone bits over PDC.
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drill Bits > Bit design (1.00)
- Reservoir Description and Dynamics (1.00)
Improving technology of horizontal sidetracking in complicated geological-technical conditions (Russian)
Bakirov, D. L. (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen) | Mazur, G. V. (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen) | Babushkin, E. V. (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen) | Bagaev, P. A. (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen) | Ovchinnikov, V. P. (Tyumen Industrial University)
The PDF file of this paper is in Russian. Sidetracking is one of the most effective technologies that allows increasing oil production while expanding reserves and increasing oil recovery from reservoirs, returning oil wells to operation. In the region where LUKOIL-Western Siberia LLC operates, these fields include Vatieganskoye, which has been developed since 1985. The main problem with sidetracking in this field is the section of unstable clay-argillite rocks (Pokachev-Savoy rock unit), drilling-in at large zenith angles, as well as transit and target productive formations with abnormally low formation pressures. At present, a set of measures has been formed that allow preventing the occurrence of accidents and complications horizontal sidetracking in incompatible conditions, reducing unproductive time. The activities include: optimization of the candidate well selection process for the sidetracking; pre-design and research work to improve the design, formulation of drilling mud, wiring technology and completion of sidetracks; conducting pilot tests; construction and updating of geomechanical models. The positive results of introducing an integrated approach for well reconstruction using sidetracking method in incompatible geological and technological conditions made it possible to construct sidetracks with multilateral horizontal completion, which ensured an increase in drainage area and well productivity. The current experience and technical and technological solutions were widely used in sidetracking operations and in production drilling in difficult conditions.
- Well Drilling > Drilling Fluids and Materials (0.89)
- Well Drilling > Drilling Operations > Directional drilling (0.49)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.35)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Drillstem/well testing (0.35)
Drilling of parametric borehole on the Zheldonskaya area under conditions of diverse lithological and stratigraphic section and uncertainty of geological and technical conditions (Russian)
Kurbanov, Ya. M. (ZapSibBurNIPI Branch of SIC Nedra JSC, RF, Tyumen) | Zaykovskaya, T. V. (ZapSibBurNIPI Branch of SIC Nedra JSC, RF, Tyumen) | Cheremisina, N. A. (ZapSibBurNIPI Branch of SIC Nedra JSC, RF, Tyumen) | Danilov, O. F. (Industrial University of Tyumen, RF, Tyumen)
The pdf file of this paper is in Russian. Now the most prospective objects to perform exploration works are deep horizons of Eastern Siberia. Specific feature of penetration in these conditions is the presence of abnormal reservoir pressures and relatively low reservoir temperatures. Should be noted the presence of rocks of hard drillability as well as heterogeneous rocks interlayered with soft rocks, and also the presence in section of thick halite layers and other unstable chemogenic rocks. Such complex alternation of deposits causes occurrence of various complications (inability to go down and sticking of drilling tools and casing, lost circulation, poor cementing of casing, casing collapse, etc.) Zheldonskaya parametric borehole is founded in the north-west of the Irkutsk region in the territory of Ust-Ilim region. Purpose of drilling - identifying hydrocarbon reservoirs of fractured and cavernous type at the top of Riphean strata, as well as porous reservoirs in Vendian sandstones; assessment of their prospects for finding oil and gas. Technological parameters of drilling fluid had been designed taking into account a set of core tasks that must be dealt with during drilling borehole, and taking into account geological features. Task was complicated by presence in section of saline rocks and intercalations of salts of different thickness, excluding the possibility of application of fresh-water drilling fluids, and by presence of cavernous limestone, in which catastrophic absorptions are probable. Composition and properties of drilling mud must also ensure prevention of landslides and sloughing, formation of minimum filtrate invaded zone in promising horizons, while rheology parameters must facilitate optimization of technological process of washover and quality cuttings removal. In article are proposed technological solutions for conducting deep parametric borehole in difficult conditions of diverse lithologic and stratigraphic section and uncertainty of geological and technical conditions that allowed to drill a borehole with a 5-column construction and to execute a complex of geological, geophysical and technological studies for solving parametric tasks. Also are reviewed issues of cementing of casing and principles of selection of recipes of cement slurries taking into account the lithologic and stratigraphic structure and chemical composition of the rocks and fluids in intervals of cementing. The proposed systems of drilling fluids and compositions of cement slurries allowed to ensure conduction of deep parametric borehole under conditions of diverse lithologic and stratigraphic section and uncertainty of geological and technical conditions, to ensure execution of geological task and for the first time to study section of sedimentary rocks of Zheldonskaya borehole to a depth of 4500 m.
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Rock Type > Sedimentary Rock (0.88)
The results of construction of the first small diameter multilateral well in LUKOIL PJSC (Russian)
Meshcheriakov, K. A. (PermNIPIneft Branch of LUKOIL-Engineering LLC) | Okromelidze, G. V. (PermNIPIneft Branch of LUKOIL-Engineering LLC) | Yatsenko, V. A. (LUKOIL-PERM LLC) | Fefelov, Yu. V. (PermNIPIneft Branch of LUKOIL-Engineering LLC) | Suntsov, S. V. (PermNIPIneft Branch of LUKOIL-Engineering LLC) | Malkov, Yu. V. (PermNIPIneft Branch of LUKOIL-Engineering LLC)
The PDF file of this paper is in Russian. One of the most perspective areas in the field of drilling is small diameter well (SDW) construction. The early SDW construction has no proper development to a whole number of reasons. At present time the main questions are solved. The reducing of casing strings diameter and weight-supporting capacity of drilling rig leads to a well construction cost downsizing up to 25%. In 2010 LUKOIL-PERM LLC was drilled the first small diameter multilateral well and it profitability was confirmed. In 2014 the first directional well with horizontal completion was drilled. In 2017 LUKOIL-PERM LLC was drilled the first multihole small diameter well. Initial flow of multihole small diameter well was 18,8 t/day, that is more than 3,2 times exceed the flow rate of the surrounding directional small diameter wells and high by 1,8 times the horizontal small diameter wells. The article gives the minimization risks solutions by the construction of first multihole small diameter well and description the drilling process. The analysis of SDW production evolution shows that a production decline rate of SDW and SDW with horizontal completion is comparable with the similar design gage diameter wells. The results of SDW construction are summarized in article. Technical and technological solutions, which favour to an additional reduction in construction period and material costs, are presented. The perspectives of small diameter wells drilling are marked out. Because the SDW cost minimization was reached, it is necessary to revise the profitable flow rate criterion for wells with various architectures and draw the technical and technological assessment SDW for deep geological horizons, and also implement a dual completion. In connection with deterioration of residual recoverable reserves and new opportunities in oil production area, a part of SDW construction will be increase in total drilling content. Also small diameter well should substitute for sidehole with up to 1000 m length.