Design method for improving waterflooding effect of anisotropic oil reservoir
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An anisotropy and design method technology, applied in the field of oilfield development and research, can solve problems such as unbalanced displacement of injected water, small sweeping range, and large difference in water breakthrough time of production wells
Inactive Publication Date: 2007-05-16
中国石化股份胜利油田分公司地质科学研究院
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[0004] The present invention aims at the problems of water flooding development of anisotropic seepage parameter reservoirs, large differences in water breakthrough time of production wells in different directions, unbalanced displacement of injected water in the oil layer, small sweeping range, low utilization rate, and poor development effect, etc. , put forward two effective quantitative development design methods, such as different direction well spacing design method and different direction injection-production pressure difference design method
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Embodiment 1
[0087] An Indoor Experimental Example of Different Direction Well Spacing Design Method
[0088] 1. Instructions for making simulation models
[0089] Fig. 2(A) is a schematic diagram of an anisotropic reservoir, the direction with lower permeability is set as the reference direction, denoted by direction a, and its permeability is k a ; The direction with higher permeability is indicated by direction b, and its permeability is k b . In order to facilitate the production of physical simulation models, the anisotropic model is abstracted and simplified into two different permeability strips, and the permeability strips in the direction a are rotated 90 degrees counterclockwise (Fig. 2(B)). The anisotropic model shown in Fig. 2(C) is obtained.
[0090] The test model is made by filling a glass plate with pure quartz sand. Since the glass is transparent and the quartz sand is lighter in color, the entire model is transparent in transmitted light. The experimental simulated o...
Embodiment 2
[0108] An Indoor Experimental Example of Design Method of Injection-production Pressure Difference in Different Directions
[0109] The production simulation experiment model of the different injection-production pressure difference design method adopts the equal well spacing model used in the comparison in Example 1, that is, k a =1543.8×10 -3 μm 2 , k b =3279.3×10 -3 μm 2 ; a = φ b =0.36;k rwfa =k rwfb .
[0110] In the model, the simulated well spacing is 0.2m, that is, L a = L b =0.2m (equivalent to 200m well spacing under reservoir conditions);
[0111] Set the injection-production pressure difference in the reference direction, that is, direction a, as 0.015MPa, that is, Δp a =0.015MPa (equivalent to 15MPa under reservoir conditions).
[0112] According to the ratio of injection-production pressure difference design in different directions, the injection-production pressure difference in direction b can be obtained as
[0113] Δp ...
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Abstract
The invention improves the design for aeolotropy oil reservoir water drive effect in the filed of oil exploration. Aiming at the unbalanced water filling displacement in different directions, big difference for production well's water breakthrough time and unsatisfactory water drive development, in the regular and equal spacing of wells development with filtration parameter anisotropic oil reservoir, the invention proposes an anisotropic well spacing design method and an anisotropic filling and extraction pressure difference design method to improve the oil reservoir water drive development and both of these two methods can be applied to new site well network's well spacing design and existing well network's filling and extraction pressure difference design respectively. Experiments show these two development designs can push the consistent water breakthrough time for production wells in different directions, so as to enlarge the oil reservoir's filling affected scope, improve filling water availability ratio and greatly better the oil reservoir exploration. The invention fills the blank of unavailability of quantitative design criteria for anisotropic well spacing and anisotropic filling and extraction pressure difference in anisotropic oil reservoir exploration with simple method, strong workability and practicality, and therefore makes it valuable for promotion.
Description
technical field [0001] The invention belongs to the field of oilfield development research, and relates to a design method capable of improving the effect of water flooding in anisotropic oil reservoirs, that is, by controlling the proportional relationship between well spacing in different directions and the proportional relationship between injection and production pressure differences in different directions in anisotropic oil reservoirs , can realize the balanced displacement of injected water in the oil layer, thereby expanding the sweeping range, improving the utilization rate of injected water, and improving the reservoir development effect. Background technique [0002] Due to the control of geological factors such as sedimentation, the size of seepage parameters such as reservoir permeability often shows anisotropic characteristics. The anisotropy of seepage parameters such as permeability is the basic property of reservoirs, especially fluvial reservoirs, which wil...
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