(FIRST RESULTS OF THE DEVELOPMENT OF RAISE FACE HORIZONTAL MULTILATERAL WELLS AT NARYKSKO-OSTASHKINSKOYE COALBED METHANE FIELD)
The article presents the experience of developing Russia’s first systems of raise face horizontal multilateral wells crossing vertical dewatering wells, at Naryksko-Ostashkinskoye coalbed methane field (Kuznetsk Basin). The methodology of selecting target coal seams and the drilling technique for horizontal multilateral wells are analyzed, and the specifics of operations with coal reservoirs are reviewed. The authors present the first results of well development, and identify tasks for further improvement and replication of the technology.
The main issue in the development of coalbed methane wells are the coal fines resulting from various factors, leading to a decrease in the filtration properties of the seams. Slow, continuous, and stable formation water production while taking into account the individual features of each system and the equipment used is a prerequisite for achieving high production rates. Because of this, development of a well at Naryksko-Ostashkinskoye field may take from 6 to 12 months. The study has shown that using of mud reducing the filtration properties of coal and insufficient removal of slotted liner plugs at the final stages of well construction were factors in the failure to achieve the design production figures at one of the well systems. Implementing the planned well intervention in this system will allow for restoration of filtration properties of the coal seam and increase of the production capacity of horizontal multilateral wells in the future.
V.V. Nasteka, PhD in Engineering, Gazprom dobycha Kuznetsk LLC (Kemerovo, Russia), inbox@gazpromdk.ru
A.S. Belyaev, PhD in Engineering, Gazprom dobycha Kuznetsk LLC, as.belyaev@gazpromdk.ru
E.V. Kudinov, PhD in Geology and Mineralogy, Gazprom dobycha Kuznetsk LLC, e.kudinov@gazpromdk.ru
A.G. Shevtsov, PhD in Engineering, Gazprom dobycha Kuznetsk LLC, a.shevtsov@gazpromdk.ru
A.P. Korovitsyn, Gazprom dobycha Kuznetsk LLC, a.korovicin@gazpromdk.ru
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