CN111140220A - Weak base ternary composite flooding produced well scaling condition judging method - Google Patents
Weak base ternary composite flooding produced well scaling condition judging method Download PDFInfo
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- CN111140220A CN111140220A CN201911116561.7A CN201911116561A CN111140220A CN 111140220 A CN111140220 A CN 111140220A CN 201911116561 A CN201911116561 A CN 201911116561A CN 111140220 A CN111140220 A CN 111140220A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention relates to a method for judging the scaling condition of a weak-alkali ternary combined flooding extraction well. The method mainly solves the problem that the production yield is seriously influenced by the scaling problem of the production well in the development process of the conventional weak-alkali three-component combination flooding. The method is characterized in that: the method comprises the following steps: 1. and (3) carrying out correlation analysis of the change of the extracted ions and the scaling degree: the research on the change rule of the produced liquid ions and the relation between different stages of scaling in the scaling process is carried out, and the scaling ions Ca are emphatically determined2+、Mg2+、CO3 2‑、HCO3 ‑Correlation with degree of fouling; 2. the method for prejudging the scaling condition of the production well comprises the following steps: determining a prejudgment parameter and a scaling judgment index by combining the change rule of the ions of the produced liquid of the production well in the step (1) and the relation between different scaling stages, and establishing a scaling judgment chart: and prejudging the scale of the scaling condition of the production well by using a scale judging chart. The method for judging the scaling condition of the weak-alkali ternary composite flooding extraction well can effectively prevent scale blockage caused by scaling of the extraction well and ensure productionAnd (4) rate.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering, in particular to a method for judging scaling conditions of a weak-alkali ternary complex flooding extraction well.
Background
The weak base ternary combination flooding has prominent scaling problem of a production well along with the ternary system injection process, seriously influences the production yield and restricts the popularization and application of the technology. In order to solve the problem of scaling of the production well, the scaling condition of the production well needs to be accurately pre-judged, and scale removal and prevention measures are taken for the production well in a targeted manner. At present, the related technology for the scale pre-judging of the weak-alkali ternary complex flooding extraction well is few, and no mature related patent exists.
Disclosure of Invention
The invention aims to solve the technical problem that the scaling problem of an extraction well in the development process of weak alkali ternary complex flooding in the background technology obviously and seriously influences the production yield, and provides a method for judging the scaling condition of the extraction well of the weak alkali ternary complex flooding.
The invention can solve the problems by the following technical scheme: the method for judging the scaling condition of the weak-alkali ternary composite flooding extraction well comprises the following steps:
1. performing correlation analysis of the ion change and the scaling degree of the produced liquid:
the research on the change rule of the produced liquid ions and the relation between different stages of scaling in the scaling process is carried out, and the scaling ions Ca are emphatically determined2+、Mg2+、CO3 2-、HCO3 -Correlation with degree of fouling;
2. the method for prejudging the scaling condition of the production well comprises the following steps:
determining a prejudgment parameter and a scaling judgment index by combining the change rule of the ions of the produced liquid of the production well in the step (1) and the relation between different scaling stages, and establishing a scaling judgment chart: the method for prejudging the scaling condition scale of the production well by using the scaling judging chart comprises the following steps:
a. determination of prejudgment parameters: adding Ca2+、Mg2+The concentration, the drop value and the pH value are used as parameters for drawing a chart;
b. determining a scaling judgment standard; analyzing Ca in produced liquid of production well from the beginning of injection of ternary system2+、Mg2+And (3) the concentration and pH value data are combined with the actual scaling condition of the on-site extraction well, the pH value is taken as an abscissa, and the calcium and magnesium ions and the descending value are taken as ordinates, so that a weak base ternary composite flooding extraction well scaling judgment chart is drawn, and the scaling judgment standard is determined.
The relationship between the ion change rule of the produced liquid and different stages of scaling in the step (1) is as follows: non-scaling stage, pH less than or equal to 8.2, CO3 2-、HCO3 -Small change in concentration, Ca2+、Mg2+The ion concentration sum is in an ascending trend; the critical period of scale formation is less than or equal to 8.3 of pH < 8.2 and CO3 2-、HCO3 -Increased concentration of Ca2+、Mg2+The concentration and the rising speed are reduced and are in a stable state; pH > 8.3 and CO at the scaling stage3 2-Increase in concentration, HCO3 -The descending trend of the concentration course, Ca2+、Mg2+The concentration drops sharply.
The step (2) determines that the scaling judgment standard is as follows: non-scaling period: the pH value is less than or equal to 8.2, and the concentration and the reduction of calcium and magnesium ions are less than 20 mg/L; critical period: the pH value is more than 8.2 and less than or equal to 8.3, and the concentration and the reduction value of calcium and magnesium ions are less than 20 mg/L; and (3) a fouling period: the pH value is more than or equal to 8.3, the concentration of calcium and magnesium ions and the reduction value is more than 15 mg/L.
Compared with the background technology, the invention has the following beneficial effects: according to the method for judging the scaling condition of the weak-alkali ternary composite flooding extraction well, corresponding scale removal and prevention measures are made for the extraction wells in different scaling stages, and the concentration standard of the scale inhibitor added to the extraction wells in each scaling stage is optimized. According to the actual operation on site, after anti-scaling measures are taken on the production wells in different scaling stages by using the weak-alkali ASP flooding scaling judgment chart, scale blockage caused by scaling of the production wells can be effectively prevented, the production rate is increased from 92.0% to 96.1%, the pump detection is carried out for more than 450 days, and the purpose of ensuring the production rate is achieved.
Drawings
FIG. 1 is a scale discrimination chart for a 48-well service well in an embodiment of the present invention;
FIG. 2 is a schematic diagram (30 wells) for judging scale of a ternary composite flooding production well with twelve zones in the embodiment of the invention.
The specific implementation mode is as follows:
the invention will be further explained with reference to the following figures and examples:
example 1:
the method for judging the scaling condition of the weak alkali ternary combined flooding extraction well, which is disclosed by the invention, takes the weak alkali ternary combined flooding in the apricot twelve areas of the Daqing oil field as an example to judge the scaling condition of the weak alkali ternary combined flooding extraction well, and comprises the following steps of:
firstly, correlation analysis of the change of the extracted ions and the scaling degree is carried out. According to the actual production condition of the production well, 30 production well produced fluids are taken twice every week and are subjected to water content, pH and CO3 2-、HCO3 -、CL-、Ca2+、Mg2+、SO4 2-And (4) analyzing the plasma concentration. And analyzing the change rule of each ion during scaling, and summarizing the relation between the change rule of the ions of the produced liquid and different stages of scaling.
And secondly, determining a pre-judgment parameter and a scaling judgment index by combining the ion change rule of the extraction well and the scaling condition, and establishing a scaling judgment chart.
⑴ determination of prejudgment parameters
The weak base ternary composite scale-removing substance mainly comprises carbonate scale, the formation of the weak base ternary scale is basically the balance problem of the dissolution and precipitation of carbonate, the solubility of the carbonate is greatly dependent on the pH value, and the higher the pH value is, the lower the solubility of the calcium carbonate is, and the more easily scale is separated out. Scaling ion CO in produced liquid3 2-、HCO3 -、Ca2+、Mg2+The concentration change and the scaling degree have obvious consistency, the concentration change conditions of various ions before and after the operation of the extraction well in the test area are analyzed, and the scaling ion CO is researched3 2-、HCO3 -Linear change in pH, and Ca2+、Mg2+Ion and amplitude of variation with scaling, Ca when fouling occurs in production wells2+、Mg2+The concentration sum is reduced by about 20% compared with the highest value. This indicates Ca during fouling2+、Mg2+The concentration and extent of the decrease and the change in pH can reflect the degree of fouling, and therefore Ca2+、Mg2+The concentration, the drop value and the pH value are used as parameters for drawing a chart;
⑵ determination of fouling criteria
Analyzing Ca in produced liquid of production well from the beginning of injection of ternary system2+、Mg2+Concentration and pH data, Ca was found in the non-fouling period2+、Mg2+The ion concentration is in an increasing state, at this time CO3 2-And HCO3 -The concentration is not changed greatly, and the pH value is less than 8.2; critical stage of scaling, pH value rising to 8.2, CO3 2-Increased concentration of Ca2+、Mg2+The concentration rising speed is slowed down; ca when the pH value reaches above 8.32+、Mg2+With CO3 2-Reaction takes place to form a precipitate, Ca2+、Mg2+The concentration drops sharply and enters the fouling period. The calcium and magnesium ion concentration is reduced by at least 15mg/L when the scale blockage occurs in the production well. Drawing a weak-alkali ternary composite flooding extraction well scaling judgment chart by taking the pH value as an abscissa and the calcium and magnesium ions and the descending value as ordinates, and using Ca in operation of an operation well2+、Mg2+Ion concentration and pH data are recorded into a chart, as shown in figure 1, in combination with the well scale situation of 48 operations on site, wherein no scale is found in 18 operations, scale is found in 14 operations, and scale is found in 16 wells, and as can be seen from figure 1, when the pH value is measured>8.3, calcium magnesium ion and reduction number>And when the concentration is 15mg/L, the oil well fouling can be judged. Thus, the fouling decision criteria were determined to be: non-scaling period: pH is less than or equal to 8.2, calcium and magnesium ion concentration is reduced<20 mg/L; critical period: pH is more than 8.2 and less than or equal to 8Calcium magnesium ion concentration and reduction value<20 mg/L; and (3) a fouling period: the pH value is more than or equal to 8.3, the concentration of calcium and magnesium ions and the reduction value is more than 15 mg/L.
(3) And (3) applying the scale distinguishing chart of the figure 1 to the apricot twelve-zone weak alkali ternary combination flooding 30-outlet production well, and judging the dynamic change condition of the scale state of the production well. The current Ca of 30 extraction wells2+、Mg2+And inputting the ion concentration and pH value parameters into a scale distinguishing plate to obtain a ternary composite flooding extraction well scale distinguishing plate in the apricot twelve areas, as shown in figure 2. It can be seen from fig. 2 that one well is in the fouling critical zone and 29 wells are in the fouling zone. According to the position of the production well on the plate, the scaling degree of the production well can be clearly judged, four anti-scaling measures of drip dosing, sleeve dosing, anti-scaling pump + drip dosing and anti-scaling pump + sleeve dosing are correspondingly adopted, and the clear anti-scaling effect is better in the aspect of field implementation.
Claims (3)
1. A method for judging the scaling condition of a weak-alkali ternary combined flooding extraction well is characterized by comprising the following steps: the method comprises the following steps:
1) And carrying out correlation analysis of the change of the extracted ions and the degree of fouling:
by researching the change rule of the produced liquid ions and the relation between different stages of scaling in the scaling process, the scaling ions Ca are emphatically determined2+、Mg2+、CO3 2-、HCO3 -Correlation with degree of fouling;
2) the method for prejudging the scaling condition of the production well comprises the following steps:
determining a prejudgment parameter and a scaling judgment index by combining the change rule of the ions of the produced liquid of the production well in the step (1) and the relation between different scaling stages, and establishing a scaling judgment chart: the method for prejudging the scaling condition scale of the production well by using the scaling judging chart comprises the following steps:
a. determination of prejudgment parameters: adding Ca2+、Mg2+The concentration, the drop value and the pH value are used as parameters for drawing a chart;
b. determining a scaling judgment standard; analyzing production wells from injection ternary systemCa in the produced liquid during the operation of the previous time2 +、Mg2+And (3) the concentration and pH value data are combined with the actual scaling condition of the on-site extraction well, the pH value is taken as an abscissa, and the calcium and magnesium ions and the descending value are taken as ordinates, so that a weak base ternary composite flooding extraction well scaling judgment chart is drawn, and the scaling judgment standard is determined.
2. The method for discriminating the scaling condition of the weak base ternary complex flooding extraction well according to claim 1, characterized in that: the relationship between the ion change rule of the produced liquid and different stages of scaling in the step (1) is as follows: non-scaling stage, pH less than or equal to 8.2, CO3 2-、HCO3 -Small change in concentration, Ca2+、Mg2+The ion concentration sum is in an ascending trend; the critical period of scale formation is less than or equal to 8.3 of pH < 8.2 and CO3 2-、HCO3 -Increased concentration of Ca2+、Mg2+The concentration and the rising speed are reduced and are in a stable state; pH > 8.3 and CO at the scaling stage3 2-Increase in concentration, HCO3 -The descending trend of the concentration course, Ca2+、Mg2+The concentration drops sharply.
3. The method for discriminating the scaling condition of the weak base ternary complex flooding extraction well according to claim 1, characterized in that: the step (2) determines that the scaling judgment standard is as follows: non-scaling period: the pH value is less than or equal to 8.2, and the concentration and the reduction of calcium and magnesium ions are less than 20 mg/L; critical period: the pH value is more than 8.2 and less than or equal to 8.3, and the concentration and the reduction value of calcium and magnesium ions are less than 20 mg/L; and (3) a fouling period: the pH value is more than or equal to 8.3, the concentration of calcium and magnesium ions and the reduction value is more than 15 mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114151049A (en) * | 2020-08-18 | 2022-03-08 | 中国石油化工股份有限公司 | Water well working condition diagnosis method based on multi-parameter analysis |
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2019
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| US4393938A (en) * | 1981-04-09 | 1983-07-19 | Shell Oil Company | Treating wells with ion-exchange-precipitated scale inhibitor |
| EP2371923A1 (en) * | 2010-04-01 | 2011-10-05 | Clariant International Ltd. | Scale inhibitor |
| CN105388083A (en) * | 2015-10-28 | 2016-03-09 | 陕西省石油化工研究设计院 | Oil field scaling trend prediction method |
| US20190292881A1 (en) * | 2018-03-26 | 2019-09-26 | NextStream Sensor, LLC | Method for scale treatment optimization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114151049A (en) * | 2020-08-18 | 2022-03-08 | 中国石油化工股份有限公司 | Water well working condition diagnosis method based on multi-parameter analysis |
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Effective date of registration: 20211224 Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant after: Daqing Oilfield Co.,Ltd. Applicant after: PETROCHINA Co.,Ltd. Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant before: Daqing Oilfield Co.,Ltd. |
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Application publication date: 20200512 |