Selecting the optimal development system

UDK: 622.276.1/.4.001
DOI: 10.24887/0028-2448-2019-6-38-40
Key words: multivariant simulation, optimisation, waterflooding, spectral decomposition, development plan, low permeable reservoir, hard-to-recover reserves
Authors: D.A. Sugaipov (Gazprom Neft PJSC, RF, Saint-Petersburg), G.N. Vorobyeva (Gazpromneft NTC, LLC, RF, Saint-Petersburg), R.R. Galeev (Gazpromneft NTC, LLC, RF, Saint-Petersburg), M.A. Monzherin (Gazpromneft NTC, LLC, RF, Saint-Petersburg), A.F. Nazmutdinov (Gazpromneft NTC, LLC, RF, Saint-Petersburg), R.A. Rybakov (Gazpromneft NTC, LLC, RF, Saint-Petersburg)

The article describes an example of an integrated approach to justifying a step-by-step field development strategy – choosing the optimal location of wells, the density of the well spacing, and the completion types. Algorithm for zoning the area of deposit with the disjunction of blocks by filtration-capacitive properties is presented by authors. An example of four actually drilled delineation wells illustrating the work of the described approach is given. The first of the wells confirms the quality of the reservoir in the block, the second – shows the better poroperm properties, rather than in the forecast, the third and fourth wells show the absence of a reservoir in the reservoir. After clarification of the poroperm properties for each of the blocks, multivariate simulations of technical and economic indicators were made on the Gazprom Neft’s streamlines simulator. Taking into account the financial and economic model adopted in the analysis, the existing technological limitations and the experience of contractors performing well construction, the optimal geometry of the development system and the type of completion were chosen.

Tsarichanskoe field with the target low-permeable terrigenous reservoir (average permeability coefficient of about 0,002 mkm2) is shown as an example of the application of the technique formulated in this article. The comparison of the reservoir quality and net pay maps of 2015 and 2017 and the map of current well spacing are given. A comparison of the planned and actual oil production rates for 2017 and 2018 shows the efficiency of the proposed approach. According to the authors, the versatility and flexibility of the technique allow to consider its replication to a wide range of the Company’s assets.


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