US20140233354A1 - Method for determining the acoustic characteristics of a mud filter cake - Google Patents
Method for determining the acoustic characteristics of a mud filter cake Download PDFInfo
- Publication number
- US20140233354A1 US20140233354A1 US14/348,383 US201214348383A US2014233354A1 US 20140233354 A1 US20140233354 A1 US 20140233354A1 US 201214348383 A US201214348383 A US 201214348383A US 2014233354 A1 US2014233354 A1 US 2014233354A1
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- United States
- Prior art keywords
- pressure
- low
- source
- mudcake
- frequency
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- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000012065 filter cake Substances 0.000 title description 3
- 230000001052 transient effect Effects 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 17
- 230000004044 response Effects 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Images
Classifications
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/48—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by amplitude comparison
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/024—Mixtures
- G01N2291/02416—Solids in liquids
Definitions
- the present invention relates to methods for acoustic characteristic determination of a mudcake created during well drilling, namely, fluid mobility and cake piezoconductivity.
- a mudcake is created during drilling with a drilling mud, fed into a borehole through a drilling string and removed through holes in a drill bit for lubrication of the drill bit during drilling and removal of drilled rocks to the surface.
- a layer of mudcake is formed as the fluid mixes with cuttings and/or other solids and circulates up through an annular space between an outer side of the drill string and the borehole wall. The mixture covers the borehole wall and forms a layer of mudcake. Isolation of a formation from an internal part of the borehole is one of the cake functions.
- the cake layer is frequently called as a mud cake or a filter cake.
- Direct determination method of filter cake characteristics by sampling while drilling is known, as described in the WO 2009/139992.
- a low-frequency acoustic sensor in a listening mode is used to estimate a mudcake cake pressure diffusivity (piezoconductivity) ⁇ , which is directly associated with sealing characteristics of the mudcake.
- a piston of a pretest chamber, or of any other device, was used as a device to create harmonic or periodic pressure oscillations.
- generating of pressure oscillations is not always possible in practice.
- the invention provides for creation of a simple and effective method to determine mudcake characteristics in a borehole, which allows to determine mudcake parameters by using a pressure source, generating a non-oscillating signal (e.g., a single step-wise pressure pulse).
- the method comprises registering by at least one acoustic sensor a pressure response to a low-frequency non-oscillating pressure signal generated in a borehole by at least one source. At least one characteristic of a transient process of pressure change is determined from the registered signal. A thickness of a mudcake is determined. Then based on the values received a mudcake piezoconductivity or a fluid mobility or both are determined.
- Characteristics of the transient process are an exponent of a transient component of a solution, a moment of time when the transient component of the solution reaches its maximum, and a value of maximum pressure attained during the transient process.
- Either natural or artificial sources can be used as the at least one source of the non-oscillating pressure signals.
- Low-frequency acoustic sensors/sources/transducers, a low-frequency well pressure modulation, etc., can be used as the artificial sources.
- Hydrophones, transducers, accelerometers, pressure transmitters, etc. can be used as the acoustic sensors to register the pressure response.
- the source generating the low-frequency pressure signals at the same time may be the acoustic sensor.
- the source generating the low-frequency pressure signals or the acoustic sensor of the low-frequency pressure signals or both can be installed on a packer.
- the source generating the low-frequency pressure signals or the acoustic sensor of the low-frequency pressure signals or both can be installed on a sampling probe.
- the source generating the low-frequency pressure signals or the acoustic sensor of the low-frequency pressure signals or both can be installed on a backup shoe.
- the thickness of the mudcake is determined by echo-impulse measurements comprising a supply of short high-frequency (HF) signals to the formation, and registration of arrival time of reflected echo-signals.
- HF high-frequency
- HF signals from at least two positions at different distances from the mudcake.
- FIG. 1 shows a ratio of pressure at a side of a mudcake where a sensor is installed, to a pressure amplitude at its other side for different permeability values.
- ⁇ piezoconductivity (pressure diffusivity)
- P pressure
- x a linear co-ordinate, which is perpendicular to a mudcake surface
- k permeability
- accelerometers as the sensors allows to cover wide and especially a high frequency part of low frequency spectrum (1 Hz to tens kHz); standalone pressure sensors ensure measurements of a pressure signal and can be used even when the direct contact with mudcake/formation due to some reason is undesirable or impossible, or in such places as a probe inlet, etc.
- placing source(s)/sensor(s) on the packer will ensure a good contact with the mudcake; placing them on a pad of the sampling probe will ensure the response measurement in vicinity of the probe inlet thus avoiding significant pressure signal attenuation, etc.; placing them on a backup shoe can compensate noise and ensures accurate measurement of the signal component associated with pressure diffusion through the mudcake; standalone mounting ensures flexibility during measurements and designing; etc.
- Low frequency measurements can be significantly improved by use of several sensors. They can be installed in different places: a pad of a sampling probe, a backup shoe, etc. This can ensure the noise reduction or removal, as well as possibility of the differential pressure measurements. This can increase ratio signal-interference , reduce requirements for dynamic range and sensitivity, facilitate reduction of the possible effect of the measurement geometry, etc.
- the mudcake thickness, h mc is preliminary determined based on the echo-pulse measurements including short high frequency signals supply to the formation and registration of the echo-signal time of arrival (see WO 2009/139992). During the mudcake thickness determination it is favourable to supply HF signals from at least two positions at different distances from the cake.
- a fluid mobility, ⁇ , in the mudcake is determined as
- the cake porosity, ⁇ , is estimated as 10-30%, K is a volume Young's modulus of the porous medium.
Abstract
At least one acoustic sensor registers a pressure response to a low-frequency non-oscillating pressure signal generated in a borehole by at least one source. At least one characteristic of a transient process of pressure change is determined from the registered signal. A thickness of a mudcake is determined. Then, based on the values received, a mudcake piezoconductivity or a fluid mobility or both are determined.
Description
- This application is a U.S. National Stage Application under 35 U.S.C. §371 and claims priority to Patent Cooperation Treaty Application No. PCT/RU2012/000793 filed Sep. 28, 2012; which claims priority to Russian Application No. RU2011139727 filed Sep. 30, 2011. Both of these applications are incorporated herein by reference in their entireties.
- The present invention relates to methods for acoustic characteristic determination of a mudcake created during well drilling, namely, fluid mobility and cake piezoconductivity.
- A mudcake is created during drilling with a drilling mud, fed into a borehole through a drilling string and removed through holes in a drill bit for lubrication of the drill bit during drilling and removal of drilled rocks to the surface. A layer of mudcake is formed as the fluid mixes with cuttings and/or other solids and circulates up through an annular space between an outer side of the drill string and the borehole wall. The mixture covers the borehole wall and forms a layer of mudcake. Isolation of a formation from an internal part of the borehole is one of the cake functions. The cake layer is frequently called as a mud cake or a filter cake.
- Direct determination method of filter cake characteristics by sampling while drilling is known, as described in the WO 2009/139992. In this method a low-frequency acoustic sensor in a listening mode is used to estimate a mudcake cake pressure diffusivity (piezoconductivity) κ, which is directly associated with sealing characteristics of the mudcake. A piston of a pretest chamber, or of any other device, was used as a device to create harmonic or periodic pressure oscillations. However generating of pressure oscillations is not always possible in practice.
- The invention provides for creation of a simple and effective method to determine mudcake characteristics in a borehole, which allows to determine mudcake parameters by using a pressure source, generating a non-oscillating signal (e.g., a single step-wise pressure pulse).
- The method comprises registering by at least one acoustic sensor a pressure response to a low-frequency non-oscillating pressure signal generated in a borehole by at least one source. At least one characteristic of a transient process of pressure change is determined from the registered signal. A thickness of a mudcake is determined. Then based on the values received a mudcake piezoconductivity or a fluid mobility or both are determined.
- Characteristics of the transient process are an exponent of a transient component of a solution, a moment of time when the transient component of the solution reaches its maximum, and a value of maximum pressure attained during the transient process.
- Either natural or artificial sources can be used as the at least one source of the non-oscillating pressure signals.
- Low-frequency acoustic sensors/sources/transducers, a low-frequency well pressure modulation, etc., can be used as the artificial sources.
- Hydrophones, transducers, accelerometers, pressure transmitters, etc., can be used as the acoustic sensors to register the pressure response.
- The source generating the low-frequency pressure signals at the same time may be the acoustic sensor.
- The source generating the low-frequency pressure signals or the acoustic sensor of the low-frequency pressure signals or both can be installed on a packer.
- The source generating the low-frequency pressure signals or the acoustic sensor of the low-frequency pressure signals or both can be installed on a sampling probe.
- The source generating the low-frequency pressure signals or the acoustic sensor of the low-frequency pressure signals or both can be installed on a backup shoe.
- Several sources generating the low-frequency pressure signals and mounted in several places can be used.
- The thickness of the mudcake is determined by echo-impulse measurements comprising a supply of short high-frequency (HF) signals to the formation, and registration of arrival time of reflected echo-signals.
- During mudcake thickness determination it is preferable to supply the HF signals from at least two positions at different distances from the mudcake.
- The invention is explained by a drawing where
FIG. 1 shows a ratio of pressure at a side of a mudcake where a sensor is installed, to a pressure amplitude at its other side for different permeability values. - To obtain parameters of a formation and parameters of a mudcake, propagation of a pressure pulse through the formation and the mudcake can be decoupled. Given that a dispersion pressure wavelength in the mudcake, λmc is much less than a wavelength in the formation, αfor and that a thickness of the mudcake, hmc is much less than a radius, Rb of the borehole, description of pressure signal propagation through the mudcake may be reduced to a simple one-dimensional problem.
-
- where κ is piezoconductivity (pressure diffusivity), P is pressure, x is a linear co-ordinate, which is perpendicular to a mudcake surface, k is permeability, with boundary conditions of
-
- The solution of the (1)-(2) problem is the following:
-
- It means that in case of a source producing non-oscillating pressure signal, a sensor response will contain only a transient process. For example, let us consider step-wise source function:
-
φ(t)=η(t)−η(t−τ0) (4) - By simple transformations of the (3), (4) solution we can get the following expression:
-
- One can see that the given solution contains only transient process. We can expect such a result since there are no sources to drive induced oscillations. The situation is shown as an example on
FIG. 1 , where P/P0(t) curves for models with different permeability values are plotted. In this case a step-wise initial pressure pulse of 10 seconds was used as a source. The transient process, its maximum and further decay are sufficiently pronounced and can be used for evaluation of the mudcake permeability. This possibility results from analysis of the initial pressure growth as well as from the long-term pressure reduction. Both processes can be analyzed using the (5), (6) formulae. - In general, for any non-oscillating pressure pulse a pressure response will contain only a transient process. This process has several characteristic features which can be used to evaluate the mudcake piezoconductivity κ:
- 1) An exponent of a transient component of a solution;
- 2) A moment of time τmax , when the transient component of the solution reaches its maximum;
- 3) A value of maximal pressure attained during the transient process.
- Extraction of the characteristics from the sensor response (a transient process) is not too difficult. Estimation of τmax and the maximal pressure is a simple task. To extract the above mentioned values from the signal registered by the sensor we propose to use ideas of signal treatment and filtering and phase locked loops to separate the transient and oscillating processes. This can be explained by the fact that forced vibration frequency is known (a source frequency), and a spectral content of the solution transient component is concentrated on a much lower frequency. Therefore, one can use a low frequency filter for extraction of the solution transient component. Then, it can be very easy to evaluate τmax . Selecting a decaying part of the transient component (at t>τmax) and taking its logarithm can help to find the time interval when the curve slope becomes constant. This indicates that the phase characterized by the presence of only one exponent remained, is already reached. The initial stage of this process is registered by the sensor and can be analyzed, using the (5), (6) solution formulae. Knowing these values and using formulae for their relationship with κ, one can easily evaluate its meaning (e.g., by simple iterations or using a conventional solver for finding roots of functions).
- Using accelerometers as the sensors allows to cover wide and especially a high frequency part of low frequency spectrum (1 Hz to tens kHz); standalone pressure sensors ensure measurements of a pressure signal and can be used even when the direct contact with mudcake/formation due to some reason is undesirable or impossible, or in such places as a probe inlet, etc.
- It is possible to use one or several sources and one or several acoustic sensors. It should be mentioned that often one device can operate both as a source and as a sensor, ant these states can be either combined or switched. Further, there is a flexibility as to where these sources and/or sensors are placed. Examples include but not limited to:
-
- a tool packer;
- a pad of a sampling probe;
- a backup shoe;
- source(s)/receiver(s) mounted standalone;
- etc.
- Wide variety of options is important and provides numerous advantages. For example, placing source(s)/sensor(s) on the packer will ensure a good contact with the mudcake; placing them on a pad of the sampling probe will ensure the response measurement in vicinity of the probe inlet thus avoiding significant pressure signal attenuation, etc.; placing them on a backup shoe can compensate noise and ensures accurate measurement of the signal component associated with pressure diffusion through the mudcake; standalone mounting ensures flexibility during measurements and designing; etc.
- Low frequency measurements can be significantly improved by use of several sensors. They can be installed in different places: a pad of a sampling probe, a backup shoe, etc. This can ensure the noise reduction or removal, as well as possibility of the differential pressure measurements. This can increase ratio signal-interference, reduce requirements for dynamic range and sensitivity, facilitate reduction of the possible effect of the measurement geometry, etc.
- The mudcake thickness, hmc, is preliminary determined based on the echo-pulse measurements including short high frequency signals supply to the formation and registration of the echo-signal time of arrival (see WO 2009/139992). During the mudcake thickness determination it is favourable to supply HF signals from at least two positions at different distances from the cake.
- A fluid mobility, η, in the mudcake is determined as
-
η=κφ/K - The cake porosity, φ, is estimated as 10-30%, K is a volume Young's modulus of the porous medium.
Claims (19)
1. A method for determining mudcake acoustic characteristics in a borehole, the method comprising:
registering by at least one acoustic sensor a response to a low-frequency non-oscillating pressure signal generated in a borehole by at least one source;
determining from the registered signal at least one characteristic of a pressure change transient process;
determining a thickness of a mudcake; and
determining based on values obtained a piezoconductivity of the mudcake, a fluid mobility, or both.
2. The method of claim 1 , wherein the at least one characteristic of the pressure change transient process is an exponent of a transient component of a solution, a moment of time when the transient component of the solution reaches its maximum, and a value of maximal pressure attained during the transient process.
3. The method of claim 1 , wherein a natural source is used as the source of the low-frequency non-oscillating pressure signal.
4. The method of claim 2 , wherein the at least one acoustic sensor is installed on a packer.
5. The method of claim 2 , wherein the at least one acoustic sensor is installed on a sampling probe.
6. The method of claim 2 , wherein the at least one acoustic sensor is installed on a backup shoe.
7. The method of claim 1 , wherein at least one artificial source is used as the source of the low-frequency non-oscillating pressure signal.
8. The method of claim 7 , wherein the source of the low-frequency non-oscillating signal is at the same time the acoustic sensor.
9. The method of claim 7 , wherein the low-frequency non-oscillating pressure signal is excited by a low-frequency modulation of the well pressure.
10. The method of claim 1 , wherein vibrometers are used as the acoustic sensors to register the pressure response.
11. The method of claim 1 , wherein accelerometers are used as the acoustic sensors to register the pressure response.
12. The method of claim 1 , wherein transducers are used as the acoustic sensors to register the pressure response.
13. The method of claim 1 , wherein pressure transmitters are used as the acoustic sensors to register the pressure response.
14. The method of claim 7 , wherein the source of the low-frequency non-oscillating signal or the acoustic sensor or both are installed on a packer.
15. The method of claim 7 , wherein the source of the low-frequency non-oscillating signal or the acoustic sensor or both are installed on a sampling probe.
16. The method of claim 7 , wherein the source of the low-frequency non-oscillating signal or the acoustic sensor or both are installed on a backup shoe.
17. The method of claim 7 , wherein several sources of the low-frequency non-oscillating signal are installed at different places.
18. The method of claim 1 , wherein a thickness of a mudcake is determined based on echo-impulse measurements comprising a supply of short high-frequency signals to a formation and registration of the reflected echo-signals arrival time.
19. The method of 18, wherein the short high-frequency signals are supplied at least from two positions, located at different distances from the mudcake.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2011139727/03A RU2474688C1 (en) | 2011-09-30 | 2011-09-30 | Method for determining acoustic characteristics of clay cake |
RU2011139727 | 2011-09-30 | ||
PCT/RU2012/000793 WO2013048291A1 (en) | 2011-09-30 | 2012-09-28 | Method for determining the acoustic characterisitics of a mud filter cake |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140233354A1 true US20140233354A1 (en) | 2014-08-21 |
Family
ID=47996073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/348,383 Abandoned US20140233354A1 (en) | 2011-09-30 | 2012-09-28 | Method for determining the acoustic characteristics of a mud filter cake |
Country Status (3)
Country | Link |
---|---|
US (1) | US20140233354A1 (en) |
RU (1) | RU2474688C1 (en) |
WO (1) | WO2013048291A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180016888A1 (en) * | 2015-12-11 | 2018-01-18 | Halliburton Energy Services, Inc. | Mud cake correction of formation measurement data |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EA037631B1 (en) * | 2020-07-14 | 2021-04-23 | ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ "Тота Системс" | Method for determining physical values in a well based on piezoresonance sensors without electronics and a device for its implementation |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3175639A (en) * | 1960-10-19 | 1965-03-30 | Liben William | Method for measuring formation porosity, permeability and mud cake thickness in oil well bore holes by sonic pulses |
US3542150A (en) * | 1968-10-10 | 1970-11-24 | Dresser Ind | Acoustic well-logging apparatus having angled acoustic transducers |
US4916616A (en) * | 1986-12-08 | 1990-04-10 | Bp Exploration, Inc. | Self-consistent log interpretation method |
US20090282907A1 (en) * | 2008-05-16 | 2009-11-19 | Schlumberger Technology Corporation | Methods and apparatus to control a formation testing operation based on a mudcake leakage |
US20110087473A1 (en) * | 2009-10-09 | 2011-04-14 | Maria Alejandra Jimenez Chavez | Well simulation |
US20140283592A1 (en) * | 2011-09-30 | 2014-09-25 | Schlumberger Technology Corporation | Method for determining the acoustic characteristics of a mud filter cake |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1516959A1 (en) * | 1987-06-02 | 1989-10-23 | Кишиневское Проектно-Конструкторское Бюро Автоматизированных Систем Управления | Ultrasonic device for inspecting the quality of articles |
SU1753434A1 (en) * | 1990-08-22 | 1992-08-07 | Раменский Филиал Всесоюзного Научно-Исследовательского Проектно-Конструкторского И Технологического Института Геологических, Геофизических И Геохимических Информационных Систем | Acoustic method of determining rock permeability |
EP1693685B1 (en) * | 2005-02-22 | 2014-10-22 | Services Petroliers Schlumberger | An electromagnetic probe |
-
2011
- 2011-09-30 RU RU2011139727/03A patent/RU2474688C1/en not_active IP Right Cessation
-
2012
- 2012-09-28 WO PCT/RU2012/000793 patent/WO2013048291A1/en active Application Filing
- 2012-09-28 US US14/348,383 patent/US20140233354A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3175639A (en) * | 1960-10-19 | 1965-03-30 | Liben William | Method for measuring formation porosity, permeability and mud cake thickness in oil well bore holes by sonic pulses |
US3542150A (en) * | 1968-10-10 | 1970-11-24 | Dresser Ind | Acoustic well-logging apparatus having angled acoustic transducers |
US4916616A (en) * | 1986-12-08 | 1990-04-10 | Bp Exploration, Inc. | Self-consistent log interpretation method |
US20090282907A1 (en) * | 2008-05-16 | 2009-11-19 | Schlumberger Technology Corporation | Methods and apparatus to control a formation testing operation based on a mudcake leakage |
US20110087473A1 (en) * | 2009-10-09 | 2011-04-14 | Maria Alejandra Jimenez Chavez | Well simulation |
US8849637B2 (en) * | 2009-10-09 | 2014-09-30 | Senergy Holdings Limited | Method of modeling production from a subterranean region |
US20150149141A1 (en) * | 2009-10-09 | 2015-05-28 | Senergy Holdings Limited | Well simulation |
US20140283592A1 (en) * | 2011-09-30 | 2014-09-25 | Schlumberger Technology Corporation | Method for determining the acoustic characteristics of a mud filter cake |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180016888A1 (en) * | 2015-12-11 | 2018-01-18 | Halliburton Energy Services, Inc. | Mud cake correction of formation measurement data |
US10927659B2 (en) * | 2015-12-11 | 2021-02-23 | Halliburton Energy Services, Inc. | Mud cake correction of formation measurement data |
Also Published As
Publication number | Publication date |
---|---|
WO2013048291A1 (en) | 2013-04-04 |
RU2474688C1 (en) | 2013-02-10 |
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