Abstract
X oilfield is a typical strong bottom water reservoir in Bohai Sea. It is developed by single sand body horizontal well. The edge and bottom water of the reservoir is active and natural energy development mode is adopted. At present, the comprehensive water cut of the oilfield is more than 96%, and has entered the stage of high water cut oil recovery. At present, fluid extraction from old wells and new adjustment wells are the main ways to increase oil production. With the deepening of development, the distribution of underground remaining oil is becoming more and more complex. In order to further improve the implementation effect of adjustment wells, the study of residual oil distribution law is increasingly important, and the study of water ridge morphology of horizontal wells in bottom water reservoir has an important guiding role in the study of remaining oil distribution. The main contents of this paper are as follows: the influence of horizontal well spacing, vertical and horizontal permeability ratio, single well liquid production, vertical position of horizontal well, oil-water viscosity ratio, water cut and interlayer on water ridge morphology. These understandings can effectively guide the deployment and optimization of adjustment wells. It provides technical support for the prediction of watered out thickness and optimization of adjustment well layout scheme in X oilfield, and guides the further development and production of the oilfield.
Highlights
X oilfield is a typical strong bottom water reservoir in Bohai Sea
The research shows that the closer the horizontal well is to the bottom water, the bottom water will quickly cone into the bottom of the well, the water breakthrough will be early, the water cut will rise quickly, and the radius of water ridge will be smaller (Figure 6)
In order to better study the effect of oil-water viscosity ratio on water ridge morphology, the actual viscosities of sand bodies in X oilfield are selected for numerical simulation calculation
Summary
Based on the basic data of X oilfield parameters, this paper establishes a basic model, changes the values of parameters on the basis of the basic model, analyzes the influence of each parameter on the development effect of bottom water reservoir, qualitatively explains the relationship between recovery degree and various influencing factors, and analyzes the sensitive factors affecting the development effect. The model can directly observe the bottom water inrush, and comprehensively consider the inter well interference. The model adopts a uniform grid system of 90 × 90 × 20. Other parameters of the basic model are: water oil volume ratio of 100, reservoir thickness of 15 m, porosity of 30%, horizontal permeability of 3000 mD, vertical permeability of 300 mD, initial oil saturation of 0.75, formation oil viscosity of 30 mPa·s, crude oil density of 950 kg/m3, apparent viscosity of formation water of 0.45 mPa·s, and formation water density of 1000 kg/m3. The production wells are 3 horizontal wells without water injection wells.
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