CN107576778A - A kind of CO2The quantitatively characterizing method of has channeling degree - Google Patents

A kind of CO2The quantitatively characterizing method of has channeling degree Download PDF

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Publication number
CN107576778A
CN107576778A CN201710786398.XA CN201710786398A CN107576778A CN 107576778 A CN107576778 A CN 107576778A CN 201710786398 A CN201710786398 A CN 201710786398A CN 107576778 A CN107576778 A CN 107576778A
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channeling
void fraction
injection rate
curve
fraction curve
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杨红
赵习森
江绍静
金志�
庞振宇
王宏
姚振杰
康宇龙
梁凯强
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Shaanxi Yanchang Petroleum Group Co Ltd
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Shaanxi Yanchang Petroleum Group Co Ltd
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Abstract

The invention belongs to technical field of petroleum extraction, is related to quantitatively characterizing CO2The method of has channeling degree during generation has channeling.A kind of CO2The quantitatively characterizing method of has channeling degree, comprises the following steps：Carry out CO under the conditions of reservoir pressure2Oil displacement experiment, gather and record production end oil and CO2Gas, until experiment injection end CO2Injection rate is 1PV；Draw CO2Void fraction curve, wherein ordinate are CO2Void fraction, abscissa CO2Injection rate；According to CO2Void fraction curve determines CO2Occur during has channeling injection rate corresponding to it and each section of flex point it is more corresponding to CO2Injection rate；By to CO2The recurrence of each segment data of void fraction curve obtains the regression equation of corresponding each section of void fraction curve；Calculate CO2Has channeling composite index；The present invention uses CO2This single index of has channeling composite index carrys out quantitatively characterizing CO2Has channeling degree, evaluation method is more accurately and uniformly.

Description

A kind of CO2The quantitatively characterizing method of has channeling degree
Technical field
The invention belongs to technical field of petroleum extraction, is related to quantitatively characterizing CO2The method of has channeling degree during generation has channeling.
Background technology
Carrying out CO2During oil displacement experiment and field test, by CO2Gas permeates with in-place oil nature difference, reservoir Rate is differential and the influence of the factor such as fracture development, CO2Can with oil displacement process carry out different degrees of has channeling occurs.At this stage To CO2When the evaluation of has channeling degree determines has channeling using the change curve of gas-oil ratio and oil displacement efficiency two indices to integrate more Between, but easily influenceed due to the incomplete unified of above-mentioned two evaluation index and by researcher's analytical mathematics difference, in reality Often caused to CO in the work of border2Has channeling degree evaluation it is inconsistent, and this is to a certain extent to follow-up CO2The displacement of reservoir oil is real Timely adjustment, the live assurance for noting opportunity of adopting and adjustment of injecting scheme for testing etc. cause great deviation.
Introduce CO2Has channeling composite index carrys out quantitatively characterizing CO2Has channeling degree, represent to produce from production end in oil displacement process CO2Amount and CO this moment2The ratio of injection rate, its numerical value are equal on void fraction curve, work as CO2When injection rate is 1PV, void fraction The area that curve is surrounded with transverse axis.CO2Has channeling composite index is bigger, then it represents that CO in oil displacement process2Has channeling is more serious.
The content of the invention
It is contemplated that in view of the above-mentioned problems, propose one kind with CO2Has channeling degree carrys out quantitative assessment CO as single index2 The method of has channeling degree.
Technical program of the present invention lies in：
A kind of CO2The quantitatively characterizing method of has channeling degree, comprises the following steps：
Step 1：Carry out CO under the conditions of reservoir pressure2Oil displacement experiment, gather and record production end oil and CO2Gas, until real Test injection end CO2Injection rate is 1PV；
Step 2：Draw CO2Void fraction curve, wherein ordinate are CO2Void fraction, abscissa CO2Injection rate；
Step 3：According to CO2Void fraction curve determines CO2Injection rate corresponding to it occurs during has channeling and each section of flex point is more corresponding CO2Injection rate；
Step 4：By to CO2The recurrence of each segment data of void fraction curve obtains the regression equation of corresponding each section of void fraction curve；
Step 5：CO is calculated using equation below2Has channeling composite index：
In formula,Represent CO2Has channeling composite index；Represent CO2The regression equation of void fraction curve first paragraph；Represent CO2The regression equation of void fraction curve second segment；Represent CO2The regression equation that (n+1)th section of void fraction curve；、 、 、Abscissa during expression generation has channeling, corresponding to first flex point of curve, second flex point and n-th of flex point respectively.
The technical effects of the invention are that：
The present invention uses CO2This single index of has channeling composite index carrys out quantitatively characterizing CO2Has channeling degree, avoid multiple indexs Characterized CO2Deviation caused by has channeling degree, evaluation method is more accurately and uniformly.
Brief description of the drawings
Fig. 1 is 1A block void fraction change curves of the embodiment of the present invention.
Fig. 2 is 1A blocks oil displacement efficiency of the embodiment of the present invention and gas-oil ratio change curve.
Fig. 3 is 2A block void fraction change curves of the embodiment of the present invention.
Fig. 4 is 2B blocks oil displacement efficiency of the embodiment of the present invention and gas-oil ratio change curve.
Embodiment
A kind of CO2The quantitatively characterizing method of has channeling degree, comprises the following steps：
Step 1：Carry out CO under the conditions of reservoir pressure2Oil displacement experiment, gather and record production end oil and CO2Gas, until real Test injection end CO2Injection rate is 1PV；
Step 2：Draw CO2Void fraction curve, wherein ordinate are CO2Void fraction, abscissa CO2Injection rate；
Step 3：According to CO2Void fraction curve determines CO2Injection rate corresponding to it occurs during has channeling and each section of flex point is more corresponding CO2Injection rate；
Step 4：By to CO2The recurrence of each segment data of void fraction curve obtains the regression equation of corresponding each section of void fraction curve；
Step 5：CO is calculated using equation below2Has channeling composite index：
（1）
In formula,Represent CO2Has channeling composite index；Represent CO2The regression equation of void fraction curve first paragraph；Represent CO2The regression equation of void fraction curve second segment；Represent CO2The regression equation that (n+1)th section of void fraction curve；、 、 、Abscissa during expression generation has channeling, corresponding to first flex point of curve, second flex point and n-th of flex point respectively.Embodiment 1
Step 1：With A block natural cores, carry out CO under the conditions of 13MPa reservoir pressure2Oil displacement experiment, gather and record and adopt Go out end oil and CO2Gas, until experiment injection end CO2 injection rates are 1PV；
Step 2：Draw CO2Void fraction curve, wherein ordinate are CO2Void fraction, abscissa CO2Injection rate, see Fig. 1；
Step 3：According to void fraction performance graph, CO is determined2Its injection rate is 0.3158PV during generation has channeling, and two are turned on curve The corresponding injection rate of point is respectively 0.4127PV and 0.6427PV；
Step 4：By to CO2The recurrence of each segment data of void fraction curve obtains three sections of CO successively2Each section of void fraction curve returns The equation is returned to be respectively：
Step 5：By above formula（2）、（3）And（4）Substitute into formula（1）Calculate, CO can be obtained2Has channeling composite index is 0.6157；
Step 6：Gas-oil ratio and oil displacement efficiency change curve are drawn, sees Fig. 2；As can be seen from Figure 2, A blocks start at 0.3158PV See gas, with the increase of injection rate, oil displacement efficiency is gradually rising, until when injection rate reaches 0.4571PV, its value just becomes In steady, and now gas-oil ratio is also steeply rising；And if analyzed according to existing method, will be considered that and start gas at 0.4571PV Alter.
Embodiment 2
Step 1：With B block natural cores, carry out CO under the conditions of 9MPa reservoir pressure2Oil displacement experiment, gather and record and adopt Go out end oil and CO2Gas, until experiment injection end CO2 injection rates are 1PV；
Step 2：Draw CO2Void fraction curve, wherein ordinate are CO2Void fraction, abscissa CO2Injection rate, see Fig. 3；
Step 3：According to void fraction performance graph, CO is determined2Its injection rate is 0.5610PV during generation has channeling, and three are turned on curve The corresponding injection rate of point is respectively 0.7409PV, 0.8346PV and 0.8912PV；
Step 4：By to CO2The recurrence of each segment data of void fraction curve obtains four sections of CO successively2Each section of void fraction curve returns The equation is returned to be respectively：
Step 5：By above formula（5）、（6）、（7）And（8）Substitute into formula（1）Calculate, CO can be obtained2Has channeling composite index is 0.0760；
Step 6：Gas-oil ratio and oil displacement efficiency change curve are drawn, sees Fig. 4；As can be seen from Figure 4, B blocks start at 0.5610PV See gas, with the increase of injection rate, oil displacement efficiency is gradually rising, until when injection rate reaches 0.8127PVPV, its value is Tend to be steady, and now gas-oil ratio is also steeply rising；And if analyzed according to existing method, will be considered that and opened at 0.8127PVPV Beginning has channeling.
Knowable to result of calculation in comparing embodiment 1 and embodiment 2, A, B block for analyzing to obtain using existing method The has channeling time is respectively 0.4571PV and 0.8127PV, it is clear that A blocks are early compared with the B block has channeling times, and has channeling is serious；Using new The two block has channeling composite indexes that method is calculated are respectively 0.6157PV and 0.0760PV, and A block has channeling composite indexes are remote More than B blocks, illustrate that its has channeling is even more serious.New method calculating and existing method analyze two obtained block CO2Has channeling rule It is completely the same, illustrate that new method equally has higher accuracy, in addition, new method evaluates CO than existing methods2Has channeling degree It is more directly perceived and convenient.

Claims (1)

  1. A kind of 1. CO2The quantitatively characterizing method of has channeling degree, it is characterised in that：Comprise the following steps：
    Step 1：Carry out CO under the conditions of reservoir pressure2Oil displacement experiment, gather and record production end oil and CO2Gas, until experiment Injection end CO2Injection rate is 1PV；
    Step 2：Draw CO2Void fraction curve, wherein ordinate are CO2Void fraction, abscissa CO2Injection rate；
    Step 3：According to CO2Void fraction curve determines CO2Occur has channeling when its corresponding to injection rate and each section of flex point it is how corresponding CO2Injection rate；
    Step 4：By to CO2The recurrence of each segment data of void fraction curve obtains the regression equation of corresponding each section of void fraction curve；
    Step 5：CO is calculated using equation below2Has channeling composite index：
    In formula,Represent CO2Has channeling composite index；Represent CO2The regression equation of void fraction curve first paragraph；Represent CO2 The regression equation of void fraction curve second segment；Represent CO2The regression equation that (n+1)th section of void fraction curve；、 、 、 Abscissa during expression generation has channeling, corresponding to first flex point of curve, second flex point and n-th of flex point respectively.
CN201710786398.XA 2017-09-04 2017-09-04 A kind of CO2The quantitatively characterizing method of has channeling degree Pending CN107576778A (en)

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CN108828136A (en) * 2018-03-26 2018-11-16 中国石油天然气股份有限公司 A kind of interior CO2The qualitative and quantitative analysis method of oil displacement rule
CN109241625A (en) * 2018-09-07 2019-01-18 中国石油大学(北京) CO2The evaluation method and device of technology of reservoir sweep effect
WO2019144877A1 (en) * 2018-01-23 2019-08-01 北京大学 Method for evaluating mixing effect of co2 oil-displacing and mixing agent and method for screening co2 oil-displacing and mixing agent
CN112525760A (en) * 2020-11-24 2021-03-19 厦门市健康医疗大数据中心(厦门市医药研究所) Method for digitally and quantitatively evaluating moisture absorption strength of substance
RU2787871C2 (en) * 2018-01-23 2023-01-13 Пекин Юниверсити Method for assessment of effect from mixing of agent for exclusion and mixing of oil, using co2, and method for selection of agent for exclusion and mixing of oil, using co2

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WO2019144877A1 (en) * 2018-01-23 2019-08-01 北京大学 Method for evaluating mixing effect of co2 oil-displacing and mixing agent and method for screening co2 oil-displacing and mixing agent
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RU2787871C2 (en) * 2018-01-23 2023-01-13 Пекин Юниверсити Method for assessment of effect from mixing of agent for exclusion and mixing of oil, using co2, and method for selection of agent for exclusion and mixing of oil, using co2
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