The concept for the development hard-to-recover reserves of conformal bedding oil rims

Abstract

   In this article, authors described the design of development of multilayer deposits by systems with horizontal multilat­eral wells and assessment of engineering feasibility at the concept stage. The concept of conformal bedding layers development of Eastern-Messoyakhskoye field allows to define cost-effec­tive development objects during exploitation of deposits with horizontal and multilateral wells with the use of multi­stage fracturing. Under the concept the ranking (prioritization) of layers were made prioritizing the development ob­jects and the secondary objects of addition. Considered various options for regular and non-regular development sys­tems with usage of analytical methods, sector modeling and full-scale simulation model. The development feasibility was evaluated of the horizontal well systems including multilateral wells and dual completion at each stage. The result of this work is implementation of the program research and determination of field regions of experimental program in cost effective areas in the development with both systems of horizontal wells and multilateral horizontal wells using the technology of dual completion. The project includes optimization of wells projected from well pads of main object PK1-3. Thanks to the approach described in the article, about 80% of the reserves at the secondary formations were involved into profitable development. These reserves before were estimated to be unprofitable. At the beginning of full-scale development or experimental program in the case of changes in the geological struc­ ture of the deposits, the proposed approach of determining cost-effective areas will allow you to adjust the strategy drilling of multilayer deposits without rebuilding a full-scale geological and simulation models. In addition, the results of analytical methods and sector modeling will allow finding the optimum in case of economic parameters changes, including capital costs for drilling wells.