Risk judgment method for polymer flooding oil-extraction technology
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A polymer and risk assessment technology, which is applied in the direction of production fluid, earthwork drilling, measurement, etc., can solve the problems that cannot reflect the comprehensive influence of multiple index parameters of polymer flooding technology, and achieve the effect of saving time
Active Publication Date: 2018-03-06
PETROCHINA CO LTD +1
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[0006] In order to solve the problem that the risk evaluation method in the prior art cannot reflect the comprehensive influence of multiple index parameters on the polymer flooding technology, the embodiment of the present invention provides a risk evaluation method for the polymer flooding technology, and the technical solution is as follows :
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Embodiment 1
[0050]The embodiment of the present invention provides a risk evaluation method for polymer flooding recovery technology, the evaluation method includes:
[0051] Step 101, obtaining the value of the risk index of the oil reservoir, and the applicable limit of the risk index.
[0052] Among them, the risk indicators include: reservoir temperature, reservoir water salinity, permeability, crude oil viscosity, divalent cation concentration, coefficient of variation of permeability, reservoir depth and relative density of crude oil. It should be noted that the divalent cation concentration refers to the concentration of divalent cations in the oil reservoir water.
[0053] Step 102, judging whether the value of the risk indicator is within the applicable limit.
[0054] When the value of any risk index is not within the applicable limit, it means that the reservoir is not suitable for polymer flooding recovery technology.
[0055] Step 103, when the values of all risk indicato...
Embodiment 2
[0062] This embodiment will elaborate on the risk assessment method, specifically, the risk assessment method includes:
[0063] Step 201, obtain the value of the risk index of the oil reservoir, and the applicable limit of the risk index, the risk index includes: oil reservoir temperature, oil reservoir water salinity, permeability, crude oil viscosity, divalent cation concentration, permeability coefficient of variation, Reservoir depth and relative density of crude oil. Among them, the applicable boundaries of the eight risk indicators are shown in Table 1.
[0064] Table 1 Applicable boundaries of risk indicators
[0065]
[0066]
[0067] Step 202, judging whether the value of the risk index is within the applicable limit, if the value of the risk index is not within the applicable limit, it means that the oil reservoir is not suitable for polymer flooding recovery technology.
[0068] Step 203 , when the values of all risk indicators are within the applicable l...
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Abstract
The invention discloses a risk judgment method for a polymer flooding oil-extraction technology and relates to the technical field of polymer flooding oil-extraction. The risk judgment method comprises the steps that the numerical values and the application boundaries of risk indexes of an oil reservoir are obtained, wherein the risk indexes comprise the temperature of the oil reservoir, the watermineralization degree of the oil reservoir, the permeability, the crude viscosity, the concentration of divalent cations, the permeability variation coefficient, the buried depth of the oil reservoirand the relative density of crude; whether the numerical values of the risk indexes are in the application boundaries or not is judged, when the numerical values of all the risk indexes are in the application boundaries, the risk scores, corresponding to the numerical values of the risk indexes, of the risk indexes are obtained according to a first preset rule; according to the risk scores of therisk indexes, the risk evaluation score of the oil reservoir is obtained according to a second preset rule; and the risk degree of the polymer flooding oil-extraction technology of the oil reservoiris judged according to the risk evaluation score. According to the risk judgment method for the polymer flooding oil-extraction technology, the more scientific and comprehensive risk evaluation scoreis obtained by considering the influences of the multiple risk indexes.
Description
technical field [0001] The invention relates to the technical field of polymer flooding oil recovery, in particular to a method for evaluating risks of polymer flooding oil recovery technology. Background technique [0002] In the process of oil reservoir exploitation, when the oil recovery rate is low due to insufficient pressure of the oil layer, it is generally possible to inject polymer oil displacement agent into the oil layer to enhance the driving force of the oil layer and improve the recovery rate. This kind of recovery technology using polymer flooding agent is called polymer flooding recovery technology, which is a technology commonly used in the field of oilfield development to enhance oil recovery. However, when implementing polymer flooding recovery technology for oil reservoirs with different geological conditions, reservoir parameters such as reservoir temperature, reservoir depth, and crude oil viscosity will affect the ultimate recovery of polymer flooding....
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