The development of oil rims involves significant difficulties and requires detailed feasibility studies to justify drilling of high-tech wells. At the designing stage of Novoportovskoye field development, a decision was made to drill 1,000–1,500 m horizontal wells. In 2015–2016, the project team developed a technology plan that included an assessment of technological availability to drill complex design wells and selection of geological targets for testing and subsequent economic evaluation. A feasibility study of well completion combination based on calculations using a reservoir simulation model allows one to take into account various geological and physical conditions for each project well, wells interference, and also to evaluate various recovery methods, taking into account changes in the well completion. The paper describes the results of testing wells with various completions, analysis of their performance in various geological and physical conditions, as well as approaches to development design (rolling out) based on well completions mapping. The analysis will focus on J2-6 and NP8 reservoirs which have varying reservoir properties and free gas/oil reserves ratios.
Selection of the J3 reservoir in the geological cross section, in which considerable part of oil and gas reserves is concentrated, and position of J3 relative to fluid contacts in combination with the degree of clay formation of the whole section allowed to form a matrix of characteristic oil rim zones. Based on this matrix, a well completion technology zoning map was constructed. The design solutions recommended on the basis of the developed algorithms for calculating the efficiency of completion for various geological and physical conditions were confirmed by the results of actual well operation. Considering the results obtained, the potential for replication of the combined development systems to other reservoir fields in particular NP8 reservoir was obvious.
The combination of different types of well completion based on geological conditions, technological readiness and economic evaluation allows to increase both the oil recovery factor and the economic efficiency of reservoir development.
References
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