Horizontal Well Potential Digging Technology of Point-bar Sandbody in Ultra-high Water Cut Stage: Evaluation of Flow Field Intensity

doi:10.19657/j.geoscience.1000-8527.2020.06.090

Abstract

Abstract:

In view of the difficulties in tapping the remaining oil potential of point-bar sandbody in high water cut reservoirs, the changing regularities of physical properties of high water drive in medium and high permeability reservoirs are determined through laboratory experiments, and the time-varying numerical simulation method is determined. Based on the evaluation of seepage field strength, the reservoirs are divided into three types of seepage zones, and the locations of horizontal wells in ultra-high water cut reservoirs are determined by the modeling method of the internal configuration of point-bar sand body. The results show that the method of horizontal well deployment based on flow field intensity distribution can highlight the heterogeneity of fluid flow in point-bar sandbody during the high water cut period, and the development effect of horizontal well deployment in weak flow field intensity range is better improved than in other areas. The new method is applied to Nm IV-6-3 subzone in block 2 of the Gangdong Oilfield. The flow field of the subzone is evaluated and a horizontal well is deployed. The initial daily oil production was 77.3 tons, and the cumulative oil production is predicted to be 164,000 tons at the end of the 15^th years. This new method provides a reference for well location deployment of point-bar sandbody in high water cut stage.

Key words: medium-high permeability reservoir, ultra-high water cut stage, point-bar sedimentation, internal configuration, flow field intensity

CLC Number:

TE341

GUO Qi, LI Zhen, LI Ping. Horizontal Well Potential Digging Technology of Point-bar Sandbody in Ultra-high Water Cut Stage: Evaluation of Flow Field Intensity[J]. Geoscience, 2021, 35(02): 396-402.

Figures/Tables 11

Fig.1 Relation chart of permeability change multiple and displacing multiple factor in high porosity reservoirs

Fig.2 Relation chart of permeability change multiple and displacing multiple factor in medium-low porosity reservoir

Fig.3 Relation chart of displaced multiple factor and flow field intensity

Table 1 Intensity division standard of seepage flow field

渗流场级别	流场强度系数	名称
1	0.65~1	强优势渗流带
2	0.5~0.65	弱优势渗流带
3	0~0.5	非优势渗流带

Fig.4 3D fine conceptual model of point bar

Fig.5 Strength distribution of flow field at reservoir bottom, without consideration of time-varying parameters

Fig.6 Strength distribution of flow field at reservoir bottom, with consideration of time-varying parameters in ultra-high water cut period

Fig.7 Residual oil distribution of point-bar sandbody well network in ultra-high water cut period

Fig.8 Screening map of economically recoverable areas

Fig.9 Interlayer simulation results of Nm Ⅲ-3-6-1 point-bar in Gang 3-37 well area

Fig.10 Well location map of a new horizontal well based on flow field evaluation

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