Бурение боковых стволов и углублений на юрские коллектора Вынгапуровского месторождения Кольба П.В., Климов М.Ю. / ООО "Газпромнефть НТЦ" Авторское право 2010 г., Общество инженеров-нефтяников Настоящий документ был подготовлен для презентации на Российской технической нефтегазовой конференции и выставке SPE 2010 в Москве, Россия, 26-28 октября 2010 г.Настоящий документ был выбран для презентации программным комитетом SPE по итогам анализа информации, содержащейся в реферате, предоставленном автором (авторами). Содержание документа не анализировалось Обществом инженеров-нефтяников и подлежит корректировке автором (авторами). Материал не обязательно отражает какие-либо позиции Общества инженеров-нефтяников, его руководителей и участников. Электронное воспроизведение, распространение или хранение любой части данного документа без письменного согласия Общества инженеров-нефтяников запрещается. Разрешение на воспроизведение в печатном виде ограничено рефератом в объеме не более 300 слов, копировать иллюстрации не разрешается. В реферате должно содержаться явное признание авторского права SPE

One of the methods of extraction of remaining reserves used in JSC “Gazpromneft-Noyabrskneftegaz” is sidetrack operations which also enable to involve fishing well stock of oil fields. Efficiency of these arrangements depends mainly on cooperation of specialists in geology, field development and drilling. At present, interaction pattern between subdivisions of the Company and contractor drilling organizations is developed which allows to perform full cycle of implementation of sidetracks starting with selection of wells and finishing geological support of drilling operations. Permanent field development monitoring of perspective oil deposits, application of the developed well selection technique and analysis of geological features using state- of-the-art program packages of seismic interpretation, geological and simulation modeling packages encouraged successful drilling jobs in the selected wells, getting agreement of actual flow rates and forecast and, as a result, increase of incremental oil production of the Company.

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This paper summarizes practical results of oil fields development by multilateral horizontal wells. By the example of Severo-Yangtinskoe and Chatylkynskoe oil fields the whole cycle of works from well-planning to development monitoring is described. Severo-Yangtinskoe is one of the newest oil fields operated by the Company. Field Development Project regulating its development was drawn up and approved in Central Development Commission in 2006 after that production drilling of the main object began. All project decisions are based on reservoir simulation model. According to FDP, development scheme involves irregular placement of horizontal and subvertical wells. Severo-Yangtinskoe reserves may be classified as difficult to recover; in practice it is problematic to involve such a deposit into development by conventional subvertical well schemes. During the two-year period of field development 8 horizontal wells have been successfully drilled and put on production, of which 3 are multilateral, that is the latest well completion technology probe-tested in the Company. This technology has been put into practice on the other Company's oil fields. Present work demonstrates and proves the advantages of complex reservoirs development by dual horizontal wells. Chatylkynskoe oil field is also one of the newest Company's assets. FDP regulating the development was composed and defended in Central Development Commission in 2006. The pilot project specifies horizontal wells application as well as marginal waterflooding by deviated wells for the field development. The main reservoir has significant thickness, but its geological structure is complicated by tectonic disturbances and heterogeneity. All the decisions worked out are based on a reservoir simulation modeling. During the period 2006 - 2008 7 horizontal wells have been successfully drilled, 5 of which are dual wells. General oil fields description Severo-Yangtinskoe oil field belongs to Purovskij district of Yamalo-Neneckij autonomous okrug, Tyumen region, and is situated in the territory with well-developed infrastructure. (Fig.1) In immediate proximity to Severo-Yangtinskoe field Umseyskoe and Muravlenkovskoe oil fields, operated by the Company, are situated. The area is located 32 kilometers south of Muravlenko town. Industrial oil-bearing capacity of Severo-Yangtinskoe is determined in the terrigene sediments of Megion formation, Lower Cretaceous age, and related to layers BS10 1, BS10 2, BS11 and BS10 2–0, regionally productive in Noyabrsk region. The deposits may be classified as massive, layer-uplifted and lithologically screened. The main reservoir is layer BS11, discovered in 1985 and proved by exploration wells 300R, 301R and 314R testing. Geological structure of layer BS11 is quite complex, net pay thickness of the reservoir ranges 16.6 - 1.1m (fig. 2).

The definition of oil displacement mechanism is one of major questions in problem of reservoir processes: or as mixed oilwater flow, when oil and water phase relative permeability (kro and krw) of water flood zones are specified; or as piston flow, when takes place frontal drive of oil by stream of approaching water. Phase relative permeability for water and oil are usually defined on the basis of learning filtering of oil-water mixtures through a core. Just on the basis of such experiments the curves of phase relative permeability to oil and water are performed, which then used in the different design documents and projects of field development. At the same time it is known, for example, that using modern methods of engineering inclusive reservoir simulation model are large difficulties at history matching with applying of such relative permeability curves of filtered fluids. Frequently forced variation of parameters of filtering at history matching results in concurrence of calculated and actual indexs to development at final parameters of filtering much distinguished from source, obtained in laboratory conditions. It is necessary to mark also, that in the literature last years many papers have appeared that the core is a poor material that only on its basis to plan field development because of unrepresentative of coring, as a result of which it does not mirror property of all reservoir system; high created gradients of stresses at studies in laboratory conditions as contrasted to actual; strictly oriented directivity of flow of fluid through a core with impossibility of an estimation of anisotropy of formations on permeability and etc. In a paper the features of extraction of oil reserves on some fields of Western Siberia are reviewed. Is shown, that as a whole on fields there are complex processes of fluid flow, where are formed as regions of water inrushes with consequent catastrophic watering out of individual wells, and zones of oil displacement with waterless wells, working a long time, and recovery of reserves in such zones much greater, than initial oil reserves in drained areas of these wells. It is impossible to explain by widespread assumptions about influencing reformative phase relative permeability or complex heterogeneity of oil reservoir. Formed zones of oil displacement to durable waterless operation of wells, as a rule, are connected with frontal drive. The examples of operation of some horizontal wells with high oil recovery factor (more than 0.5) in area of their drainage. The results of numerous production and injection well testing and conducting of hydrolistenings testify to such nature of water-oil displacement. The concrete offers on rational field development methods are made, when the piston condition of water-oil displacement is organized predominantly. Introduction Water-oil displacement is well-know technology of oil-field development connected with slitting of reservoirs by injection wells on separate blocks and injection in these wells of water. As a result the displaced oil is countervailed by the displacement agent - water. At that energy state of reservoir does not change and the average reservoir pressure is close to initial reservoir pressure. It is one of the major factors of rational field development of reservoirs. The modern projects of field development are founded on that principle of move of displacement front, when it is considered, that at water entry in reservoir, there is blending water to oil. As a result in water flood zone the share current of an oil-in-water mixture is carried out. In laboratory conditions, in result of pumping of oil-water mixtures with different oil-water proportions the phase permeability on oil and on water are instituted. And, as a rule, permeability on separate phases turns out much below absolute permeability of formation. Fig.1 shows the typical phase relative permeability curves.