Selection of the Optimal Type of Fractured Well Completion Based on Simulation of Highly Heterogeneous Reservoir (Russian)
- Timur Ilgizovich Gataullin (Novatek) | P. I. Eliseev (Novatek) | F. S. Zavalin (Novatek) | A. A. Lutfullin (Novatek)
- Document ID
- Society of Petroleum Engineers
- SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition, 16-18 October, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 2.4.3 Sand/Solids Control, , 5.6.9 Production Forecasting, 5.4.1 Waterflooding, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.8.2 Shale Gas, 6.5.2 Water use, produced water discharge and disposal, 2 Well Completion, 5.1.1 Exploration, Development, Structural Geology, 3 Production and Well Operations, 1.6 Drilling Operations, 5.2.1 Phase Behavior and PVT Measurements
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The pdf file of this paper is in Russian.
The basic method for oil-saturated, low permeability, anisotropic reservoir is hydraulic fracturing. Currently, the technology of a multi-stage fracturing in horizontal wells (hereinafter - the Multifractured HW) is rapidly developing, allowing the creation of several fracs in several areas of the horizontal well within the one workover.
In this paper the sequence of actions designed to calculate the targets of development with the Multifractured HW and for comparison with grids of vertical fractured wells. The main problem of calculating the field development plan with the system of the Multifractured HW on full field simulation model is the lack of reference to both the input flow rates of wells, and the dynamics of decline. To set up a simplified representation of such wells in the full simulation model the detailed sector model was created for different types of completions:
• Multifractured HW
• Fractured vertical well
The sector simulation was run for different reservoir properties, and the dependence of the flow rates ratio in the pseudo-steady state flow was calculated.
The paper presents the results of Multifractured HW drilling, comparison of design and actual performance, the lessons learned.
Description of the field development
The object of development described in this paper is the reservoir of the Cretaceous Formation Sortymskoy. The reservoir is presented with lenticular sand bodies, elongated in the sub- meridian direction. Body lithologically screened, the borders of the large bodies can be traced with the seismic surveys. Saturation of the most lenses is massive, without the underlying water. In the eastern part of the field the gas cap occurs. Reservoir is characterized as a highly heterogeneous in lateral direction, which complicates the task of organizing a water injection system to support the reservoir pressure.
Rock wettability changes both through sandbodies and a vertical section of rock from predominantly water-wet to predominantly oil-wet.
Mobility ratio fluid / water in most cases less than 1 due to the relatively low viscosity of oil at reservoir conditions (0.5-0.3 cP).
The main method of reservoir stimulation is hydraulic fracturing, 90% of the existing wells are working with fracs. Injection wells are working in the Northern section with bottom-hole pressure above the fracture initiation pressure of 50-80 atm. Moreover the hydraulic fracture half-length of 200-300 m was determined during the welltest. The total voidage replacement of produced fluid does not exceed 70% due to water injection in the non-target objects.
Several schemes of vertical fractured wells and Multifractured HW were calculated during production forecast in the undrilled areas. In the absence of a working prototype of the Multifractured HW the ratio of fractured vertical well rate to Multifractured HW from the sector model was used. The condition of applicability of Multifractured HW was developed.
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