A Method of Predicting the Sweep Radius of Oilfield Water Flooding
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A technology of oilfield water and radius, which is applied in surveying, earthwork drilling and production, wellbore/well components, etc., and can solve problems such as difficulties, high costs, and poor applicability
Active Publication Date: 2020-05-05
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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Due to the heterogeneity of the reservoir itself (the heterogeneity of low-permeability, ultra-low or even ultra-low-permeability reservoirs is stronger), the advance of the oil-water front is a non-piston advance, so the injected water advances forward during the water flooding process. It is very difficult to determine the propulsion position of the edge. At present, the source position is mainly determined according to the equations of the pressure front movement caused by the water injection well and the microseismic wave superposition induced by the pore fluid pressure change, and then the water flooding front is calculated. , this method takes a long time, is not applicable, and is expensive, so it is not necessary to predict the sweep radius of water flooding in the study area in a timely and effective manner.
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Embodiment 1
[0056] A method for predicting the sweep radius of oilfield water flooding, comprising the following steps:
[0057] The first step is to obtain the basic parameters:
[0058] Statistics of geological reserves N and cumulative liquid production under formation N at any time pL , Cumulative oil production N p , Cumulative water production W p , cumulative water intrusion W e , cumulative water injection W i , single well stage oil production q o , Oil production Q of single well group stage o , single well stage water production q w , Water production Q of single well group stage w ; The core is measured to obtain the core porosity φ, the original oil saturation S oi , water saturation S w , gas saturation S g , oil saturation S o ;Test the core to get the crude oil compressibility C o , formation water compressibility C w , gas compressibility C g , the rock compressibility coefficient C is obtained by rock mechanics measuring instrument f ; crude oil volume fac...
Embodiment 2
[0087] The present invention is described in conjunction with the Chang 6 reservoir in the YZM well area of the Yanchang Oilfield. The calculation steps and results are as follows, and the basic parameters of the reservoir fluid are as shown in Table 1.
9.3 Formation water compressibility coefficient (10 -4 / MPa)
4.2 Rock compressibility factor (10 -4 / MPa)
5.2 Original formation pressure (MPa) 3.7 Current formation pressure (MPa) 1.2
[0090] 1. According to the parameters in Table 1, through the formula C t =C o S o +C w S w +C f Obtained, the total compressibility factor of formation is 11.76×10 -4 / MPa, the total formation pressure drop is 2.5MPa. ...
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Abstract
The invention belongs to the technical field of oil exploitation, and particularly relates to a method for predicting the water drive swept radius of an oil field. The method for predicting the waterdrive swept radius of the oil field comprises the following steps that basic parameters are obtained; the total injected water amount of a stratum at one time is calculated; the ineffective water injection proportion coefficient a is obtained, and accordingly the actual stratum total effective injected water volume is obtained; the water drive area is obtained; according to the piston type water drive oil theory, the equivalent circular water drive area and the equivalent circle radius r are obtained; due to anisotropism of a reservoir stratum, the actual oil deposit is non-piston type displacement of reservoir oil, accordingly, the water drive swept radius is corrected, and the oil well water content and the single-well set average water content are obtained; and the correction factor f is obtained; and the water drive swept radius R is equal to the product of r and f. According to the method, very important guidance significance is achieved for reasonable oil water well parameter allocation, production system adjustment and oil water well scheme adjustment in combination of a tracer agent, crack monitoring, a production and injection profile and other means.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for predicting the sweep radius of oilfield water flooding. Background technique [0002] It is the first time at home and abroad to apply reservoir engineering methods and principles to quantitatively calculate and characterize the sweep radius of water flooding in water injection development oilfields, to draw a single well group water flooding sweep / production radius plan, to quantitatively describe the single well group water flooding front, to track water The flooding sweep direction and front position represent the water breakthrough distance of the oil well. The water drive sweep radius is the area that the injected water can reach in the reservoir under the existing well pattern conditions, and the distance from the edge of this area to the center of the water injection well is called the water drive sweep radius. [0003] The inventio...
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