Study on Diamond Inverted Nine-spot Well Pattern Reasonable Well Spacing for Planar Anisotropic Reservoir

doi:10.11885/j.issn.1674-5086.2013.11.18.03

Abstract

Abstract: Reservoir anisotropy permeability has an important effect on the well pattern and oil well capacity during the oilfield development process. However, the normal well pattern is not suitable for the anisotropic reservoir, and the oil well water breakthrough time in the main permeability direction is short. However, the water flooding in the side permeability direction is poor or the oil well is not swept. In order to solve this problem, we break through the traditional well pattern, based on the water flooding stream tube method and material balance equation, and build up the nine spot well network of planar anisotropic reservoir. In this paper, when the water breakthrough time of edge well and corner well is equal, the reservoir can achieve the balance flooding effect. According to the basic characteristics of anisotropic reservoir, this paper establishes the calculating formula of geometric parameters of reasonable injection and production unit of nine spot well network. And the formula is verified by examples. In the anisotropic reservoir, the shorter corner well spacing increases with the increase of the longer corner well spacing and decreases rapidly with the increasing anisotropy coefficient. When the anisotropic coefficient is smaller than 10, the corner well spacing decreases slowly. The new diamond inverted nine-spot well pattern improves reservoir recovery and sweep efficiency of injected water. This paper provides the theoretical basis and guidance for planar anisotropic reservoir construction of nine spot well pattern.

Key words: anisotropic reservoir, permeability, nine spot well pattern, water breakthrough time, well spacing

CLC Number:

TE348

LIU Feng, CHEN Xiaofan. Study on Diamond Inverted Nine-spot Well Pattern Reasonable Well Spacing for Planar Anisotropic Reservoir[J]. 西南石油大学学报(自然科学版), 2016, 38(6): 125-130.

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