CN111075432B - Mud cake correction method based on electromagnetic wave propagation measuring instrument - Google Patents
Mud cake correction method based on electromagnetic wave propagation measuring instrument Download PDFInfo
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- CN111075432B CN111075432B CN201911330947.8A CN201911330947A CN111075432B CN 111075432 B CN111075432 B CN 111075432B CN 201911330947 A CN201911330947 A CN 201911330947A CN 111075432 B CN111075432 B CN 111075432B
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Abstract
The invention discloses a mud cake correction method based on an electromagnetic wave propagation measuring instrument, which comprises the following steps: (1) establishing a dielectric mud cake correction model: (2) inverting the algorithm process. The mud cake correction method based on the electromagnetic wave propagation measuring instrument can effectively eliminate the influence of mud cake parameters on the dielectric phase and amplitude of electromagnetic waves in different polarization directions, and can realize the elimination of mud cake response under the condition that mud cakes exist (the thickness of the mud cakes is not more than 5 cm).
Description
Technical Field
The invention belongs to the field of petroleum logging, and particularly relates to a mud cake correction method based on an electromagnetic wave propagation measuring instrument in the field.
Background
In an electromagnetic wave propagation logging system, the measured dielectric constant needs to be obtained in real time through phase information and attenuation information so as to evaluate the fluid saturation (water saturation and oil saturation). However, in the process of oil and gas development, in order to effectively protect the well bore, prevent the collapse of the well wall and prevent blowout, mud with different proportions needs to be added in the well drilling process, and due to the fact that the pressure in the well bore is larger than the pressure of the stratum, mud cakes with certain wall thickness can be formed around the well wall. In the early 80 s, foreign companies proposed a method for correcting a plate by using a mud cake, namely obtaining a plate of logging responses under the condition that mud cake and stratum parameters are known, then drawing a chart of corresponding relations between the logging responses and the stratum parameters, and eliminating the influences of mud cake thickness, mud cake dielectric constant and conductivity by means of table lookup. The function of mud cake correction can be realized by utilizing a digital plate technology, but because the properties of mud cakes are different, the plate can only solve the problem of mud cakes under partial conditions, and the correction under all mud cakes can not be met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a mud cake correction method based on an electromagnetic wave propagation measuring instrument.
The invention adopts the following technical scheme:
the mud cake correction method based on the electromagnetic wave propagation measuring instrument is improved by comprising the following steps of:
(1) Establishing a dielectric mud cake correction model:
in the electromagnetic wave propagation measurement, 1 transmitting and more than 2 receiving are adopted, the antenna adopts a dual-polarization mode, more than 2 curves of phase Pha and amplitude Amp can be obtained, an electromagnetic wave dielectric instrument is attached to a mud cake, and the mud cake is attached to the stratum;
oil layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 12, and the conductivity is 0.033s/m;
a water flooded layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 15, and the conductivity is 0.04s/m;
water layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 20, and the conductivity is 0.05s/m;
(2) The inversion algorithm process:
according to the logging curve, the phase Phai and the amplitude Ampi of electromagnetic wave propagation can be obtained, i =1 … n, n > =2, and the following algorithm is used for calculating a single point; the calculation method is the following iteration:
(21) According to the property of the mud, calculating the conductivity information of the mud cake, giving the conductivity of the mud cake, and taking the resistivity measured according to the resistivity measurement curve as the resistivity of the stratum;
(22) Giving the initial mud cake thickness, the dielectric constant of the mud cake, the conductivity and the dielectric constant of the stratum, and carrying the mud cake thickness, the dielectric constant of the stratum and the conductivity and the dielectric constant of the stratum into a mud cake positive algorithm to obtain an electromagnetic wave dielectric phase and amplitude curve;
(23) Respectively carrying out inversion iterative computation on dielectric phases and amplitudes in different polarization directions by the obtained Jacobian matrix;
(24) And outputting the inverted phase and amplitude in different polarization directions according to the judgment condition.
The invention has the beneficial effects that:
the mud cake correction method based on the electromagnetic wave propagation measuring instrument can effectively eliminate the influence of mud cake parameters on the dielectric phase and amplitude of electromagnetic waves in different polarization directions, and can realize the elimination of mud cake response under the condition that mud cakes exist (the thickness of the mud cakes is not more than 5 cm).
Drawings
FIG. 1 is a formation mud cake calibration model;
FIG. 2 is a process flow diagram of a log of the method of the present invention;
FIG. 3 is an algorithmic flow chart of the method of the present invention;
FIG. 4 is a graph of the results of actual processing by the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment is a mud cake correction method of an electromagnetic wave propagation measuring instrument in the field of petroleum logging, the electromagnetic wave logging device can be used for effectively obtaining the phase and amplitude change of electromagnetic waves in formation propagation, and further obtaining dielectric constant and resistivity information, but in the measuring process, part of information is influenced by mud cakes due to the existence of the mud cakes, so that the dielectric constant and the resistivity information cannot accurately evaluate the formation water porosity and the mineralization.
Embodiment 1, this embodiment discloses a mud cake correction method based on an electromagnetic wave propagation measurement instrument, including the following steps:
(1) Establishing a dielectric mud cake correction model:
in the electromagnetic wave propagation measurement, 1 transmitting and 4 receiving are adopted, 4 phase Pha and amplitude Amp curves can be obtained by an antenna in a dual-polarization mode, an electromagnetic wave dielectric instrument is attached to a mud cake, and the mud cake is attached to a stratum;
oil layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 12, and the conductivity is 0.033s/m;
a water flooded layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 15, and the conductivity is 0.04s/m;
water layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 20, and the conductivity is 0.05s/m;
mud cakes with different characteristics have different influences on the phase and the amplitude of the curve.
(2) The inversion algorithm process:
according to the logging curve, the phase Phai and the amplitude Ampi of electromagnetic wave propagation can be obtained, i =1 … n, n > =2, and the following algorithm is used for calculating a single point; the calculation method is the following iteration:
(21) According to the property of the mud, calculating the conductivity information of the mud cake, giving the conductivity of the mud cake, and taking the resistivity measured according to the resistivity measurement curve as the resistivity of the stratum;
(22) Giving the initial mud cake thickness, the dielectric constant of the mud cake, the conductivity and the dielectric constant of the stratum, and carrying the mud cake thickness, the dielectric constant of the stratum and the conductivity and the dielectric constant of the stratum into a mud cake positive algorithm to obtain an electromagnetic wave dielectric phase and amplitude curve;
(23) The obtained Jacobian matrix is subjected to inversion iterative computation respectively aiming at dielectric phases and amplitudes in different polarization directions;
(24) And outputting the inverted phase and amplitude in different polarization directions according to the judgment condition.
The embodiment establishes a mud cake correction method based on an electromagnetic wave propagation measuring instrument, and eliminates the influence of mud cake parameters in different polarization directions on the formation dielectric constant through a real-time inversion technology on the basis of measuring a plurality of phases and amplitudes of the formation to obtain the phase and the amplitude of the electromagnetic wave propagation in the real formation.
Claims (1)
1. A mud cake correction method based on an electromagnetic wave propagation measuring instrument is characterized by comprising the following steps:
(1) Establishing a dielectric mud cake correction model:
in the electromagnetic wave propagation measurement, 1 transmitting and more than 2 receiving are adopted, the antenna adopts a dual-polarization mode, more than 2 curves of phase Pha and amplitude Amp can be obtained, an electromagnetic wave dielectric instrument is attached to a mud cake, and the mud cake is attached to the stratum;
oil layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 12, and the conductivity is 0.033s/m;
a water flooded layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 15, and the conductivity is 0.04s/m;
water layer: the mud cake dielectric constant is 60, the conductivity is 0.25s/m, the undisturbed formation dielectric constant is 20, and the conductivity is 0.05s/m;
(2) The inversion algorithm process:
according to the logging curve, the phase Phai and the amplitude Ampi of electromagnetic wave propagation can be obtained, i =1 … n, n > =2, and the following algorithm is used for calculating a single point; the calculation method is the following iteration:
(21) According to the property of the mud, calculating the conductivity information of the mud cake, giving the conductivity of the mud cake, and taking the resistivity measured according to the resistivity measurement curve as the resistivity of the stratum;
(22) Giving the initial mud cake thickness, the dielectric constant of the mud cake, the conductivity and the dielectric constant of the stratum, and carrying the mud cake thickness, the dielectric constant of the stratum and the conductivity and the dielectric constant of the stratum into a mud cake positive algorithm to obtain an electromagnetic wave dielectric phase and amplitude curve;
(23) The obtained Jacobian matrix is subjected to inversion iterative computation respectively aiming at dielectric phases and amplitudes in different polarization directions;
(24) And outputting the inverted phase and amplitude in different polarization directions according to the judgment condition.
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Citations (4)
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| CN101680964A (en) * | 2007-04-16 | 2010-03-24 | 普拉德研究及开发股份有限公司 | An antenna of an electromagnetic probe for investigating geological formations |
| CN102725479A (en) * | 2009-10-20 | 2012-10-10 | 普拉德研究及开发股份有限公司 | Methods for characterization of formations, navigating drill paths, and placing wells in earth boreholes |
| CN106446408A (en) * | 2016-09-23 | 2017-02-22 | 上海神开石油设备有限公司 | Rapid forward and inversion processing method for compensating-while-drilling electromagnetic wave instrument |
| CN107356966A (en) * | 2017-07-20 | 2017-11-17 | 中国石油化工股份有限公司 | Based on removing compaction deep layer river channel sand gas-oil detecting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016123014A1 (en) * | 2015-01-26 | 2016-08-04 | Schlumberger Technology Corporation | Method for determining formation properties by inversion of multisensor wellbore logging data |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101680964A (en) * | 2007-04-16 | 2010-03-24 | 普拉德研究及开发股份有限公司 | An antenna of an electromagnetic probe for investigating geological formations |
| CN102725479A (en) * | 2009-10-20 | 2012-10-10 | 普拉德研究及开发股份有限公司 | Methods for characterization of formations, navigating drill paths, and placing wells in earth boreholes |
| CN106446408A (en) * | 2016-09-23 | 2017-02-22 | 上海神开石油设备有限公司 | Rapid forward and inversion processing method for compensating-while-drilling electromagnetic wave instrument |
| CN107356966A (en) * | 2017-07-20 | 2017-11-17 | 中国石油化工股份有限公司 | Based on removing compaction deep layer river channel sand gas-oil detecting method |
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| 泥饼对电磁波传播测井的影响;吴信宝等;《大庆石油地质与开发》;19900930;第9卷(第3期);第69-78页 * |
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