CN105003238A - Method for analyzing dryness of downhole steam by aid of pressure and temperature profiles of well bores - Google Patents
Method for analyzing dryness of downhole steam by aid of pressure and temperature profiles of well bores Download PDFInfo
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- CN105003238A CN105003238A CN201510437301.5A CN201510437301A CN105003238A CN 105003238 A CN105003238 A CN 105003238A CN 201510437301 A CN201510437301 A CN 201510437301A CN 105003238 A CN105003238 A CN 105003238A
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- 238000000034 method Methods 0.000 title claims abstract description 22
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- 230000015572 biosynthetic process Effects 0.000 claims description 3
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- 238000010793 Steam injection (oil industry) Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
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Abstract
The invention discloses a method for analyzing the dryness of downhole steam by the aid of pressure and temperature profiles of well bores. The method includes building heat conduction and heat loss models according to properties of the well bores and strata; dividing each integral well bore into a plurality of depth sections in units of dimensions; creating corresponding calculation programs comprising saturation temperatures, saturation pressures, single-phase density, viscosity, perpendicular downward flow pattern change models and the like; taking average values in the dimensions as calculation parameters, setting a steam dryness parameter by the aid of a corresponding wellhead used as an initial depth, calculating flow resistance of the downhole steam by the aid of set steam dryness and measured temperatures, combining the flow resistance, flow patterns and integrated density with one another to obtain downhole pressure gradients and comparing the obtained gradients to measured pressure gradients; calculating corresponding wet steam enthalpies by the aid of obtained dryness values, measured pressures and the measured temperatures, calculating a heat loss quantity in a dimension section by the aid of a theoretical process to obtain an enthalpy of a next depth, calculating the dryness of the steam, and repeatedly carrying calculation in the same manner by the aid of steam dryness values used as set values so as to obtain the dryness of the steam of the depth sections.
Description
Technical field
the present invention relates to the method for oil-field thick-oil well exploitation steam injection profile analysis underground steam mass dryness fraction, specifically one utilizes wellbore pressure temperature profile to analyze underground steam mass dryness fraction method.
Background technology
at present, in heavy oil wells steam injection development process, underground monitoring technology generally achieves the pressure of down-hole, the test of temperature, and the way of well sampling and theoretical calculate is mainly taked in the monitoring for mass dryness fraction.In two kinds of methods, the former needs sampler under independent lower going-into-well, and under will lower going-into-well being distinguished for different depth; The latter is flow, mass dryness fraction situation combined ground and down-hole steam transmitting pipe line according to ground, the character of tubing string and environmental aspect, the heat loss amount in the theory of computation, thus the mass dryness fraction calculating down-hole, and the real conditions of down-hole unclear.
Summary of the invention
object of the present invention is exactly in view of the foregoing defects the prior art has, and design one utilizes wellbore pressure temperature profile to analyze underground steam mass dryness fraction method.
the present invention is realized by following technical proposals:
utilize wellbore pressure temperature profile to analyze underground steam mass dryness fraction method, comprising: according to pit shaft and formation properties, set up heat conduction and heat leakage model; Need according to precision, determine to calculate dimension, whole pit shaft is divided into the multiple depth segment in units of dimension; Application water and steam theory sets up corresponding calculation procedure, comprises saturation temperature, saturation pressure, single-phase density, viscosity, vertically downward variations in flow patterns model etc.; By average in equal for calculating parameter taken amount guiding principle, result of calculation is also the average in units of dimension; Using well head (or other degree of depth) as initial depth, combined ground steam parameter or a setting steam quality parameter (0-100%), it can be used as the setting steam quality of calculating; Application settings steam quality and record temperature computation underground steam flow resistance, in conjunction with flow pattern and combined density, obtains down-hole pressure gradient, gained gradient and observed pressure gradient is contrasted; According to comparing result, if result is consistent with actual measurement, then illustrate that setting steam quality conforms to down-hole is actual; If inconsistent, then calculate moist steam density by observed pressure gradient and gained flow resistance sum, then calculate a new steam quality, using this steam quality as setting value, until obtain and survey the steam quality conformed to; With the enthalpy of the mass dryness fraction value obtained and observed pressure, temperature computation respective wet steam, the heat loss amount of a dimension section is calculated with theoretical method, obtain the enthalpy of the next degree of depth, calculation of steam mass dryness fraction, using this steam quality value as setting value, repeat above-mentioned recursive calculation, obtain the steam quality of this depth segment.
the invention has the beneficial effects as follows: be applicable to oil-field thick-oil well exploitation steam injection profile analysis underground steam mass dryness fraction, easy and simple to handle, logging data application efficiency is high, decrease construction times of going into the well, reduce the possibility of accidental error, obtain the steam quality change section of whole pit shaft, data is more accurate.Compare theoretical calculate method, gained steam quality data is based on down-hole field data, reliability and accuracy higher.Obtained by down-hole mass dryness fraction section, evaluation can be made in time to the situation such as effect of heat insulation, down-hole accident of down-hole string (comprising certain section of instlated tubular).
Accompanying drawing explanation
fig. 1-analysis process block diagram of the present invention.
Detailed description of the invention
below in conjunction with accompanying drawing, enforcement of the present invention is further elaborated:
utilize wellbore pressure temperature profile to analyze underground steam mass dryness fraction method, comprising:
1., according to pit shaft and formation properties, set up heat conduction and heat leakage model;
2. need according to precision, determine to calculate dimension, whole pit shaft is divided into the multiple depth segment in units of dimension;
3. apply water and steam theory and set up corresponding calculation procedure, comprise saturation temperature, saturation pressure, single-phase density, viscosity, vertically downward variations in flow patterns model etc.;
4., by average in equal for calculating parameter taken amount guiding principle, result of calculation is also the average in units of dimension;
5. using well head (or other degree of depth) as initial depth, combined ground steam parameter or setting a steam quality parameter (0-100%), it can be used as the setting steam quality of calculating;
6. application settings steam quality and record temperature computation underground steam flow resistance, in conjunction with flow pattern and combined density, obtains down-hole pressure gradient, gained gradient and observed pressure gradient is contrasted;
7. according to comparing result, if result is consistent with actual measurement, then illustrate that setting steam quality conforms to down-hole is actual; If inconsistent, then calculates moist steam density by observed pressure gradient and gained flow resistance sum, then calculate a new steam quality, using this steam quality as setting value, repetition 1.5 calculating, until obtain and survey the steam quality conformed to;
8. with the enthalpy of the mass dryness fraction value obtained and observed pressure, temperature computation respective wet steam; the heat loss amount of a dimension section is calculated with theoretical method; obtain the enthalpy of the next degree of depth; calculation of steam mass dryness fraction; using this steam quality value as setting value; repeat above-mentioned 5,6 to calculate, obtain the steam quality of this depth segment;
9. according to steam quality, thus calculate the steam quality section of pit shaft.
Claims (1)
1. utilize wellbore pressure temperature profile to analyze a underground steam mass dryness fraction method, its method is: first, according to pit shaft and formation properties, sets up heat conduction and heat leakage model; Secondly, as required, determine that calculating dimension is 1m, is divided into the multiple depth segment in units of dimension by whole pit shaft; 3rd, application water and steam theory sets up corresponding calculation procedure, comprises saturation temperature, saturation pressure, single-phase density, viscosity, vertically downward variations in flow patterns model etc.; 4th, by average in equal for calculating parameter taken amount guiding principle, result of calculation is then the average in units of dimension; 5th, using well head (or other degree of depth) as initial depth, combined ground steam parameter or a setting steam quality parameter (0-100%), it can be used as the setting steam quality of calculating; 6th, application settings steam quality and record temperature computation underground steam flow resistance, in conjunction with flow pattern and combined density, obtains down-hole pressure gradient, gained gradient and observed pressure gradient is contrasted; 7th, according to comparing result, if result is consistent with actual measurement, then illustrate that setting steam quality conforms to down-hole is actual; If inconsistent, then calculates moist steam density by observed pressure gradient and gained flow resistance sum, then calculate a new steam quality, using this steam quality as setting value, repetition 1.5 calculating, until obtain and survey the steam quality conformed to; 8th, with the enthalpy of the mass dryness fraction value obtained and observed pressure, temperature computation respective wet steam, the heat loss amount of a dimension section is calculated with theoretical method, obtain the enthalpy of the next degree of depth, calculation of steam mass dryness fraction, using this steam quality value as setting value, repeat the calculating of 1.5,1.6, obtain the steam quality of this depth segment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108318620A (en) * | 2017-12-22 | 2018-07-24 | 中国石油天然气股份有限公司 | Steam dryness determining method and device for steam injection pipe |
| CN110344796A (en) * | 2018-04-04 | 2019-10-18 | 中国石油化工股份有限公司 | Steam injection parameter prediction technique based on three Parameter Principles |
| CN113139260A (en) * | 2020-01-17 | 2021-07-20 | 中国石油化工股份有限公司 | System and method for improving drilling simulation calculation speed |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108318620A (en) * | 2017-12-22 | 2018-07-24 | 中国石油天然气股份有限公司 | Steam dryness determining method and device for steam injection pipe |
| CN110344796A (en) * | 2018-04-04 | 2019-10-18 | 中国石油化工股份有限公司 | Steam injection parameter prediction technique based on three Parameter Principles |
| CN110344796B (en) * | 2018-04-04 | 2021-08-06 | 中国石油化工股份有限公司 | Steam injection parameter prediction method based on three-parameter principle |
| CN113139260A (en) * | 2020-01-17 | 2021-07-20 | 中国石油化工股份有限公司 | System and method for improving drilling simulation calculation speed |
| CN113139260B (en) * | 2020-01-17 | 2024-02-09 | 中国石油化工股份有限公司 | System and method for improving well drilling simulation calculation speed |
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Inventor after: Du Xiaocun Inventor after: Bi Xinzhong Inventor after: Rong Wei Inventor after: Yang Yang Inventor after: Zhang Jing Inventor after: Yang Guang Inventor after: Sheng Yuan Inventor after: Hao Yuanyuan Inventor after: Dong Jian Inventor after: Zhang Xuan Inventor after: Chen Juan Inventor after: Xiong Zhaohong Inventor after: Yang Lu Inventor after: Liu Lixin Inventor after: Yang Na Inventor after: Sun Peng Inventor after: Dai Qingyu Inventor after: Wei Hongyi Inventor after: Huang Chun Inventor after: Zhang Supeng Inventor after: Wang Dong Inventor after: Wang Rongyan Inventor after: Ma Guolun Inventor after: Zhang Xiufang Inventor before: Du Xiaocun Inventor before: Zhang Supeng Inventor before: Wang Dong Inventor before: Wang Rongyan Inventor before: Ma Guolun Inventor before: Zhang Xiufang |
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Effective date of registration: 20170410 Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant after: Sinopec Corp. Applicant after: Gudong Oil Production Factory, Shengli Oil Field Branch, SINOPEC Applicant after: Wei Hongyi Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant before: Sinopec Corp. Applicant before: Gudong Oil Production Factory, Shengli Oil Field Branch, SINOPEC |
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