CN112798656A - Method for prejudging mineralization degree of oil field water gas injection boiler - Google Patents
Method for prejudging mineralization degree of oil field water gas injection boiler Download PDFInfo
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- CN112798656A CN112798656A CN202110139333.2A CN202110139333A CN112798656A CN 112798656 A CN112798656 A CN 112798656A CN 202110139333 A CN202110139333 A CN 202110139333A CN 112798656 A CN112798656 A CN 112798656A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
Abstract
The application discloses a method for prejudging the mineralization degree of an oil field water gas injection boiler, which comprises the steps of monitoring the conductivity of softened water of water at the front end of water supply, collecting a real-time water supply sample of the boiler and determining the real-time conductivity X of the real-time water supply sample when the conductivity of the softened water is greater than a preset value, calculating the mineralization degree Y of the real-time water sample according to a prejudging formula and the real-time conductivity, and obtaining the mineralization degree Y which can directly reflect the content of the mineralization degree of the oil field water gas injection boiler. The operation period of the boiler is prolonged, the scaling condition of the boiler is reduced, and the maintenance cost of the boiler is greatly reduced.
Description
Technical Field
The application belongs to the technical field of mineralization degree prejudgment, and particularly relates to a method for prejudging the mineralization degree of an oil field water gas injection boiler.
Background
With the deep development of oil fields, the exploitation technology of the oil fields is continuously developed and improved, in order to exploit thick oil and improve the exploitation rate of low-permeability oil fields, the oil fields are exploited by adopting an oil field steam injection process, and therefore, the oil field steam injection boiler is widely applied. The steam injection boiler is the main equipment for steam injection thermal recovery, the water supply index of the boiler is very strict, and the steam injection boiler has strict requirements on the hardness, the salt content and the iron content of water, the pH value of the water supply and the dryness of formed steam. The salinity in the water of the steam injection boiler is an index for evaluating the total salt content of the water of the steam injection boiler, is an important reference data for reflecting the operation condition and the scaling condition of the boiler, and can more intuitively reflect the water quality condition of the steam injection boiler through monitoring the salinity. At present, the monitoring of the mineralization is still analyzed by adopting a gravimetric method, the cycle of the mineralization analyzing process is found to be long, the water quality condition cannot be reflected in time, errors are easily introduced in the analyzing process, the accuracy of the measuring result is reduced, and when the result is in doubt, the rechecking cycle is long, and the water quality condition at the moment is difficult to be accurately reproduced. Some on-line monitoring instruments also have obvious errors in monitoring the mineralization degree due to the fact that the water quality conditions are complex and changeable, and certain difficulties are caused to the operation and maintenance of the water quality of the steam injection boiler of the oil field.
Disclosure of Invention
The application aims to provide a method for prejudging the mineralization degree of an oil field water and gas injection boiler, which aims to solve the problems of long water quality mineralization degree measuring period and large measuring error and directly reflect the water quality condition of the oil field water and gas injection boiler in time.
The first aspect of the embodiment of the application provides a method for prejudging the mineralization degree of an oil field water gas injection boiler, which comprises the following steps:
monitoring the conductivity of the softened water of the purified water at the front end of the water supply;
when the conductivity of the softened water is larger than a preset value, collecting a real-time water supply sample of the boiler and determining the real-time conductivity X of the real-time water supply sample;
calculating the mineralization degree Y of the real-time water sample according to a pre-judging formula and the real-time conductivity, wherein the pre-judging formula is as follows: y =0.5423X +32.571 xr2Wherein r is2Is a correlation coefficient, r2=0.9867。
In an embodiment, the obtaining of the prejudgment formula includes:
collecting samples, namely collecting water samples of different operation stages of a steam injection boiler in an oil field operation area;
acquiring parameters, and respectively measuring the conductivity and the mineralization degree of water samples in different operation stages of the boiler;
accumulating data, repeating the steps of collecting samples and acquiring parameters, and accumulating and summarizing parameters of the conductivity and the mineralization degree of the water samples of the boiler in different operation stages for not less than one year;
screening data, screening the parameters and eliminating invalid data to form valid parameters;
performing correlation study, namely performing correlation calculation on the effective parameters to obtain correlation coefficients, and checking the significance of the correlation coefficients;
obtaining the prejudgment formula: y =0.5423X +32.571 xr2。
In an embodiment, the obtaining of the prejudgment formula further includes:
verifying the validity of the prejudgment formula: and comparing the mineralization degree calculated by a prejudgment formula with the actually measured mineralization degree, and calculating that the relative deviation degree between the mineralization degree and the actually measured mineralization degree is not more than 8%.
In one embodiment, the water samples of the boiler in different operation stages comprise the softened water, the feed water, the clean water, the salt water and the high salt water.
In one embodiment, the conductivity is measured in situ or by an on-line monitoring instrument.
In one embodiment, the mineralization is determined gravimetrically in a laboratory environment, wherein a single set of data is determined over a period of not less than 4 days.
Compared with the prior art, the application has the beneficial effects that:
1. the method for prejudging the mineralization degree of the oil field water gas injection boiler can timely provide the salt content of water of the oil field gas injection boiler, the water quality condition is not required to be continuously worsened due to the overlong analysis period, and the quality of steam injection of the oil field can be effectively improved.
2. The method for prejudging the mineralization degree of the oil field water gas injection boiler can reduce the analysis cost of the mineralization degree, reduce the analysis frequency and save the analysis cost.
3. The method for prejudging the mineralization degree of the oil field water gas injection boiler can timely adjust the water quality of the gas injection boiler through prejudging, prolong the operation period of the boiler, reduce the scaling condition of the boiler and greatly reduce the maintenance cost of the boiler.
Drawings
FIG. 1 is a flowchart of an example method for predicting the mineralization of an oilfield water gas injection boiler provided by an embodiment of the present application;
fig. 2 is a flowchart of an exemplary method for obtaining a prejudgment formula according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 shows a flowchart of an example method of a method for predicting the mineralization degree of an oilfield water gas injection boiler provided in an embodiment of the present application, and for convenience of description, only the parts related to the embodiment are shown, which are detailed as follows:
a method for prejudging the mineralization degree of an oil field water gas injection boiler comprises the following steps:
s10, monitoring the conductivity of softened water for water purification at the front end of water supply;
s20, when the conductivity of the softened water is larger than a preset value, collecting a real-time water supply sample of the boiler and determining the real-time conductivity X of the real-time water supply sample;
s30, calculating the mineralization degree Y of the real-time water sample according to a pre-judging formula and the real-time conductivity, wherein the pre-judging formula is as follows: y =0.5423X +32.571 × r2, where r2 is the correlation coefficient and r2= 0.9867.
In the embodiment, by monitoring the conductivity of softened water of the purified water at the front end of the water supply, when the conductivity of the softened water is larger than a preset value, collecting a real-time water supply sample of a boiler and measuring the real-time conductivity X of the real-time water supply sample, and calculating the mineralization degree Y of the real-time water sample according to a pre-judgment formula and the real-time conductivity, the obtained mineralization degree Y can directly reflect the mineralization degree content of the oil field water injection boiler, the mineralization degree pre-judgment method of the oil field water injection boiler can timely provide the salinity condition of the oil field water injection boiler water, does not need to continuously deteriorate the water quality condition due to overlong analysis period, can effectively improve the steam injection quality of the oil field, can reduce the analysis cost of the mineralization degree, reduce the analysis frequency, save the analysis cost, and can timely adjust the water quality of the steam injection boiler due to the pre-judgment in advance, prolong the operation period of, greatly reducing the maintenance cost of the boiler.
In an embodiment, the obtaining of the prejudgment formula includes:
s31, collecting samples, namely collecting water samples of different operation stages of a steam injection boiler in an oil field operation area;
s32, acquiring parameters, and respectively measuring the conductivity and the mineralization degree of water samples of the boiler at different operation stages;
s33, accumulating data, repeating the steps of collecting samples and obtaining parameters, and accumulating and summarizing parameters of the conductivity and the mineralization degree of the water samples of the boiler in different operation stages for not less than one year;
s34, screening data, namely screening the parameters and eliminating invalid data to form effective parameters;
s35, correlation research, namely performing correlation calculation on the effective parameters to obtain correlation coefficients, and checking the significance of the correlation coefficients;
s36, obtaining the prejudgment formula: y =0.5423X +32.571 xr2。
In an embodiment, the obtaining of the prejudgment formula further includes:
verifying the validity of the prejudgment formula: and comparing the mineralization degree calculated by a prejudgment formula with the actually measured mineralization degree, and calculating that the relative deviation degree between the mineralization degree and the actually measured mineralization degree is not more than 8%.
In this embodiment, the conductivity and the mineralization degree of the water samples in different operation stages of the steam injection boiler in the oilfield operation area are respectively measured by collecting the water samples in different operation stages of the steam injection boiler, the steps of collecting the samples and obtaining the parameters are repeated, the parameters of the conductivity and the mineralization degree of the water samples in different operation stages of the boiler for not less than one year are accumulated and summarized, the parameters are screened and invalid data are eliminated to form effective parameters, and the effective parameters are obtainedThe effective parameters are subjected to correlation calculation to obtain correlation coefficients, and the significance of the correlation coefficients is checked to obtain the prejudgment formula: y =0.5423X +32.571 xr2And comparing the mineralization degree calculated by the prejudgment formula with the actually measured mineralization degree, and calculating that the relative deviation degree between the mineralization degree and the actually measured mineralization degree is not more than 8% to determine that the prejudgment formula is feasible.
In one embodiment, the water samples of the boiler in different operation stages comprise the softened water, the feed water, the clean water, the salt water and the high salt water.
In one embodiment, the conductivity is measured in situ or by an on-line monitoring instrument.
The mineralization content can be predicted at any time by measuring the conductivity through an online monitoring instrument.
In one embodiment, the mineralization is determined gravimetrically in a laboratory environment, wherein a single set of data is determined over a period of not less than 4 days.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (6)
1. A method for prejudging the mineralization degree of an oil field water gas injection boiler is characterized by comprising the following steps:
monitoring the conductivity of the softened water of the purified water at the front end of the water supply;
when the conductivity of the softened water is larger than a preset value, collecting a real-time water supply sample of the boiler and determining the real-time conductivity X of the real-time water supply sample;
calculating the mineralization degree Y of the real-time water sample according to a pre-judging formula and the real-time conductivity, wherein the pre-judging formula is as follows: y =0.5423X +32.571 xr2Wherein r is2Is a correlation coefficient, r2=0.9867。
2. The method for predicting the mineralization degree of the oil field water gas injection boiler according to claim 1, wherein the obtaining of the prediction formula comprises:
collecting samples, namely collecting water samples of different operation stages of a steam injection boiler in an oil field operation area;
acquiring parameters, and respectively measuring the conductivity and the mineralization degree of water samples in different operation stages of the boiler;
accumulating data, repeating the steps of collecting samples and acquiring parameters, and accumulating and summarizing parameters of the conductivity and the mineralization degree of the water samples of the boiler in different operation stages for not less than one year;
screening data, screening the parameters and eliminating invalid data to form valid parameters;
performing correlation study, namely performing correlation calculation on the effective parameters to obtain correlation coefficients, and checking the significance of the correlation coefficients;
obtaining the prejudgment formula: y =0.5423X +32.571 xr2。
3. The method for predicting the mineralization degree of the oil field water gas injection boiler according to claim 2, wherein the obtaining of the prediction formula further comprises:
verifying the validity of the prejudgment formula: and comparing the mineralization degree calculated by a prejudgment formula with the actually measured mineralization degree, and calculating that the relative deviation degree between the mineralization degree and the actually measured mineralization degree is not more than 8%.
4. The method for predicting the mineralization degree of the oil field water and gas injection boiler according to claim 2, wherein the water samples of different operation stages of the boiler comprise the softened water, the feed water, the clean section water, the salt section water and the high salinity water.
5. The method of predicting the mineralization of an oil field water gas injection boiler of claim 2, wherein the electrical conductivity is measured in situ or by an on-line monitoring instrument.
6. The method for predicting the mineralization of an oil field water gas injection boiler of claim 2, wherein the mineralization is determined gravimetrically in a laboratory environment, and wherein a single set of data is determined over a period of not less than 4 days.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507663A (en) * | 2011-10-27 | 2012-06-20 | 中国石油天然气股份有限公司 | Mineralization measuring method and system, and spreading degree measuring system |
| CN104847344A (en) * | 2015-05-20 | 2015-08-19 | 成都理工大学 | Formation water salinity prediction method during low gas well water-air ratio |
| US20200378903A1 (en) * | 2018-12-26 | 2020-12-03 | Jiangsu Maihe Internet Of Things Technology Co., Ltd | Detection system and detection method for water content and conductivity |
| CN112229877A (en) * | 2020-10-26 | 2021-01-15 | 新奥数能科技有限公司 | Conductivity monitoring method, device and system for boiler front end side feed water |
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- 2021-02-02 CN CN202110139333.2A patent/CN112798656A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507663A (en) * | 2011-10-27 | 2012-06-20 | 中国石油天然气股份有限公司 | Mineralization measuring method and system, and spreading degree measuring system |
| CN104847344A (en) * | 2015-05-20 | 2015-08-19 | 成都理工大学 | Formation water salinity prediction method during low gas well water-air ratio |
| US20200378903A1 (en) * | 2018-12-26 | 2020-12-03 | Jiangsu Maihe Internet Of Things Technology Co., Ltd | Detection system and detection method for water content and conductivity |
| CN112229877A (en) * | 2020-10-26 | 2021-01-15 | 新奥数能科技有限公司 | Conductivity monitoring method, device and system for boiler front end side feed water |
Non-Patent Citations (2)
| Title |
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| "油田注汽锅炉蒸汽干度电导法和化学法测定差异原因的分析", 《新疆石油天然气》, vol. 12, no. 2, pages 72 * |
| 吴诗怡: "塔克拉玛干沙漠地下水矿化度与电导率关系的研究", 《中国沙漠》, vol. 16, no. 4, pages 374 - 375 * |
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