TITLE:
The Research and Applications of Remaining Oil Potential Tapping in High Watered Stage for Heavy Oil Reservoir in Bohai
AUTHORS:
Junting Zhang, Zongbin Liu, Lilei Wang, Zhou Fang, Jingfu Deng
KEYWORDS:
Heavy Oil Reservoir, Tracer Material, Sweep Efficiency, Bohai, Remaining Oil Description
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.6 No.9,
August
29,
2018
ABSTRACT: S oil field is a typical of water injection development of heavy oil reservoir in
Bohai, and the formation of crude oil viscosity is 42 - 284 mPa⋅s. Due to the
formation of crude oil viscosity, the oil field development gradually faces a
series of problems as rapid rise of water cut, rapid decline of output, high water
cut of oil wells and others. In order to improve the effect of oilfield development,
it is necessary to increase the output of the oilfield by adjusting wells
for the potential in the oilfield. However, due to the high cost of drilling, operation
and testing of offshore oilfields, offshore oilfields require more elaborate
description of residual oil and adjustment wells. With the continuous
downturn in international oil prices and the lack of new testing data in old
oilfields, it is urgent to re-use the existing data in oilfields through innovative
methods to achieve a detailed description of the remaining oil in the oilfields
and improve the precision research of indexing wells and ensure the reliable
implementation of adjustment wells. Based on the existing dynamic data of S
oilfield, this paper proposes a new method to quantitatively evaluate water
flooding coefficient by using tracer theory to establish tracer data, and quantitatively
evaluates the vicinity of the fault by means of image reflection and
potential superposition and find the residual oil in the imperfect area of the
well network, combined with the numerical simulation method to realize the
fine description of remaining oil and improve the research precision of the
adjustment well. Through the research in this paper, S oilfield has proposed
to location of six adjustment wells which has implemented two. The production
confirmed that the method of this paper has some reliability, while the
method of heavy oil in the high water cut stage of residual oil fine description.
The research of enhanced oil recovery in the stage has certain guiding significance
for heavy oil reservoirs.