WO2015126416A1 - Determining water salinity and water-filled porosity of a formation - Google Patents
Determining water salinity and water-filled porosity of a formation Download PDFInfo
- Publication number
- WO2015126416A1 WO2015126416A1 PCT/US2014/017738 US2014017738W WO2015126416A1 WO 2015126416 A1 WO2015126416 A1 WO 2015126416A1 US 2014017738 W US2014017738 W US 2014017738W WO 2015126416 A1 WO2015126416 A1 WO 2015126416A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- porosity
- determining
- salinity
- dielectric
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 47
- 238000005259 measurement Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005755 formation reaction Methods 0.000 claims description 42
- 230000006870 function Effects 0.000 claims description 23
- 229930195733 hydrocarbon Natural products 0.000 claims description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims description 15
- 230000001419 dependent effect Effects 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 238000009529 body temperature measurement Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
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
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
-
- 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
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
-
- 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
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
-
- 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
- E21B47/04—Measuring depth or liquid level
Definitions
- Such information typically includes characteristics of the earth formations traversed by the borehole and data relating to the size and configuration of the borehole itself.
- the collection of information relating to conditions downhole, which commonly is referred to as "logging,” can be performed by several 10 methods including wireline logging.
- a probe or“sonde” is lowered into the borehole after some or the entire well has been drilled.
- the sonde hangs at the end of a long cable (“wireline”) that provides mechanical support to the sonde and also provides an electrical connection between the sonde and electrical equipment located at the surface of the well.
- wireline long cable
- various parameters of the earth’s formations are measured and correlated with the position of the sonde in the borehole as the sonde is pulled uphole.
- the direct electrical connection between the surface and the sonde provides power and a relatively large bandwidth for conveying logging information.
- One desirable formation parameter is water-filled porosity of the formation, as it 20 is useful for determining the quantity and producibility of hydrocarbons within the formation.
- knowledge regarding water salinity is usually required.
- the standard techniques for determining water salinity are: (1) take a water sample from the well after it has been drilled, or (2) extrapolate from other wells in the region.
- these approaches to be unreliable due to significant 25 salinity variation within and between wells, particularly when fluid injection is employed for secondary recovery. In the latter case, the fluid injection causes substantial salinity variation laterally across the reservoir and vertically around the reservoir, making the standard techniques impractical or hopelessly inaccurate.
- FIG. 1 shows an illustrative wireline logging environment.
- FIG. 2 is a flow diagram of an illustrative method for determining water salinity and water-filled porosity of a formation having unknown or mixed salinity.
- FIGS. 3A and 3B are illustrative graphs depicting real and imaginary components of water’s dielectric constant.
- FIGS. 4A and 4B are illustrative graphs depicting temperature-dependent function coefficients.
- FIG. 5 is an illustrative log of water salinity related parameters.
- Certain illustrative method embodiments include acquiring a downhole temperature, along with a total porosity measurement and dielectric measurement of the formation, and determining water salinity from such measurements. Additionally, based at least in part on the water salinity, a dielectric constant of water and 25 a refractive index of the water may be calculated, thereby enabling a calculation of a water-filled porosity.
- the temperature, porosity, and dielectric measurements may be acquired in log form, i.e., as a function of depth or position along a borehole. Temperature-dependent function coefficients may be used in calculating the water salinity. Moreover, the coefficients may be saved to memory for later recall and/or 30 displayed to the user along with the water-filled porosity.
- FIG. 1 depicts an illustrative wireline logging environment 100.
- a borehole 102 (having a borehole wall 103) has been drilled through various formations 104 in a typical drilling manner.
- a drilling platform 106 supports a derrick 108 capable of raising and l i d ill t i ( t h ) th h th b h l 102 I th fi the drill string has been removed, enabling a wireline cable 110 to convey a wireline tool string 112 through the borehole 102.
- the tool string 112 includes various downhole tools 114, 116 that may help with a determination of formation properties, for example, water salinity and water-filled porosity determinations.
- Example downhole tools 114, 116 5 may include a downhole temperature sensor, a dielectric measurement tool, and/or a porosity measurement tool, such as a density-neutron or nuclear magnetic resonance (NMR) tool.
- a control sub for coordinating the operation of the various tools in the tool string and providing telemetry that enables the measurements collected by the 10 various tools to be communicated to the surface.
- measurements collected by the tools 114, 116 may be stored in memory of the tool string 112 and/or processed by a downhole processor within the tool string 112.
- a computing or logging facility 118 which includes a computer system 120 having a processor may be arranged at 15 the surface to receive the processed or unprocessed measurements.
- the computer system 120 may include a memory having software executed by the processor to configure the logging facility 118 to manage tool string 112 operations, acquire and store the measurements, and process the measurements for display to an operator.
- the computer system 120 and processor may be capable of receiving 20 the downhole measurements from the tools 114, 116, and responsively calculating water salinity and/or water-filled porosity of the formation. Moreover, such calculations may be a function of the acquired temperature, dielectric, and porosity measurements from the tools 114, 116. In particular, the water-filled porosity calculations may be based at least in part on water salinity and down hole temperature.
- the memory of the computer system 120 may 25 additionally store information for recall later, such as the water salinity and temperature dependent function coefficients used to determine the water salinity.
- the logging facility 118 may present the raw or calculated information to a user via a user interface that includes a monitor or printer.
- wireline environment 100 of FIG. 1 is depicted as a land-based 30 environment with a vertical wellbore 16, it is contemplated herein that the same principles may be applied to a sea-based environment, as well as a deviated or horizontal wellbore, without departing from the scope of the disclosure.
- FIG. 2 is a flow diagram of an illustrative method 200 for determining water salinity and water-filled porosity of a formation having an unknown or mixed water salinity.
- a downhole temperature T is acquired, as at block 202.
- the formation porosity and an overall dielectric measurement ⁇ are also typically acquired, as may be accomplished by a 5 porosity measurement tool and a dielectric measurement tool at blocks 204 and 206, respectively.
- the measured formation properties can be treated as 10 being independent of the formation or rock texture.
- the complex dielectric value is thus related to only the fluids and minerals that make up the formation.
- a processor determines the water salinity based on the acquired temperature, porosity, and dielectric measurements via the following equations.
- variables having an 15 are a complex value having real and imaginary components.
- the dielectric value of the formation can be measured in real-time by the
- HFDT high frequency dielectric tool
- Equation 1 represents the dielectric measurement as taken by the HFDT as a function of three rock constituents: matrix (ma), water (w), and hydrocarbons (HC).
- V represents 25 their relative volumes (which may be expressed as a percentage or dimensionless fraction of unity) and is the root of their respective dielectric values (also defined as the refractive index Equation 1 becomes equation 2:
- the refractive index is also a complex value, having real and imaginary parts, , thus equations representing the
- real and imaginary components may be represented as equation 3 (the real components) 5 and 4 (the imaginary components):
- equations 3 and 5 With representing the total porosity, the relative volumes may be represented as Therefore, equations 3 and 5 become:
- the total porosity is known (i.e., from one of the downhole tools 114, 116, 25 such as the density-neutron or NMR tool).
- the difference in porosity (1- ) can be calculated, and the hydrocarbon refractive index and matrix refractive index are known or estimatable from previously obtained or calculated data.
- the type of hydrocarbons may be determined by monitoring drilling fluids, acquiring formation fluid samples, or extrapolating from what is known from seismic data and/or nearby 5 wells.
- the refractive index of the rock matrix can be determined in a similar fashion, and advantageously, such values are expected to be more readily determinable than water salinity.
- hydrocarbon refractive index is also known from previously obtained or calculated data, such as
- equation 10 can be represented as:
- equation 14 The coefficients a0, a1, a2, b0, b1, b2 can be determined by fitting quadratic curves to laboratory measurements of saline water. Applying equations 12 and 13 to equation 11 results in equation 14:
- Equation 14 can also be represented as equation 15 by subtracting the right side of the equation and isolating and .
- the temperature-dependent coefficients (a0, a1, a2, b0, b1, and b2) may also be known from prior calculations, thus allowing a determination of water salinity . 10
- the coefficients (a0, a1, a2, b0, b1, and b2) may be unknown and need to be solved for at block 208.
- Stroud, Milton & De (Physical Review B Vol. 34, No. 8, Oct. 15, 1986) shows that at 1GHz, the water’s dielectric and can be approximated by the empirical relationship shown in equations 16 and 17:
- FIGS. 3A and 3B depict the real and imaginary components of water’s dielectric constant as measured at various temperatures.
- FIG. 3A depicts a graph 300 illustrating the real portion of the refractive index of water for the temperature 50°, 100°, 200°, and 300° as plots 302, 304, 306, and 308, respectively.
- the X-axis is a log-based scale representing water salinity 25 in KPPM (thousands of parts per million) and the Y-axis represents the refractive of the water .
- a second order polynomial can be fit to each of the temperature curves 302, 304, 306, 308.
- a piecewise polynomial fit may be performed on each curve. For example, generating a first polynomial fit for a salinity of 0 to 10, a second polynomial fit from 10 to 100, and a third polynomial fit from 100 upwards, resulting in the following equations:
- FIG. 3B is similar to FIG. 3A, however the graph 310 plots the imaginary dielectric component of the water as a function of temperature and water salinity .
- a single polynomial equation may be derived for each temperature, or alternatively10 multiple piecewise polynomials may be derived, resulting in the illustrative equations 21- 23:
- the coefficients (a0, a1, a2, b0, b1, and b2), they may be graphed as depicted in FIGS. 4A and 4B.
- the graph 4A illustrates the coefficient a2 depicted as plot 402.
- the X-axis represents temperature and the Y-axis represents the coefficient value.
- the coefficient value associated with the temperatures plotted in FIGS. 3A and 3B, 50°, 100°, 200°, and 300°, are marked as points 404, 406, 20 408, and 410, accordingly, and the third order polynomial equation 20 results in the curve fitting plot 402 and equation 24:
- FIG. 4B similarly represents a graph 412 for the coefficient b2, as does equation 25.
- the coefficients (a0, a1, a2, b0, b1, and b2), they may be employed in equation 15, thereby enabling the determination of water salinity . It is likely that the coefficients can be extrapolated for use in additional or future calculations for unmeasured temperatures.
- 5 water-filled porosity may be found, as at block 210.
- the water’ s dielectric constants and may be calculated using equations 16 and 17. As discussed above, is also defined as the refractive index .
- the magnitude and angle of the refractive index may be calculated by equations 26 and 27:
- these calculations can now be performed in near real-time, for example, by the processor of the computer system 120 (FIG. 1). Additionally, the hydrocarbon porosity may be determined based on the water-filled porosity from the previously mentioned formula .
- One or a multiple of the aforementioned measurements and determinations may be logged and/or presented to the user with the computer system 120. 25 It should be understood that the method 200 may vary and may, for example, include more or less blocks, and the blocks may be performed in parallel or in a different order.
- FIG. 5 is an illustrative log 500 of water salinity related parameters.
- the Y-axis represents depth, which may be true vertical depth of the tool string or may be overall well depth.
- the log 500 includes measurements used to determine water salinity and water-filled porosity of a formation, such as a porosity ( ) log 502, a dielectric measurement log 504, and a downhole temperature log 506.
- the log 500 may 5 further include the resulting calculated water salinity 508 and water-filled porosity 510.
- the user may be capable of quickly determining which portions of the formation contain hydrocarbons, and in what quantity. It will be appreciated that the log 500 is merely for illustrative purposes and is not to scale or accuracy.
- a method of determining water-filled porosity of a formation that includes acquiring a downhole temperature, acquiring a total porosity of the formation, acquiring a dielectric measurement of the formation, determining a water salinity based on the temperature, total porosity, and dielectric measurement, and determining a water-filled porosity of the formation based at least in part on the water salinity.
- a system for determining and logging water-filled porosity having a downhole tool assembly that acquires downhole temperature measurements, the tool assembly including a dielectric measurement tool that acquires dielectric measurements of formations surrounding a borehole, and a porosity measurement tool that acquires total porosity measurements of the formations.
- the system further having a processor that 25 determines and logs water-filled porosity of the formation as a function of the temperature, dielectric, and porosity measurements.
- Element 1 presenting a log of the water-filled porosity to a user.
- Element 2 where the temperature, total porosity, and dielectric measurements are30 acquired as a function of depth or position along a borehole, and the determining a water- filled porosity includes creating a log of the water-filled porosity as a function of depth or position along a borehole.
- Element 3 where determining a water salinity includes relating the real and imaginary components of water’s dielectric constant.
- Element 4 where determining the water salinity and determining the water-filled porosity are performed by a processor in real-time.
- Element 5 determining a hydrocarbon porosity of the formation based on the water-filled porosity.
- Element 6 where determining a water salinity includes obtaining temperature-dependent function coefficients expressing a dependence of real 5 and imaginary components of water’s dielectric constant on salinity.
- Element 7 where determining the function coefficients includes implementing a piecewise polynomial fit.
- Element 8 further including determining real and imaginary components of a refractive index of the formation from the dielectric measurement.
- Element 9 calculating a constant based on the refractive index, the porosity, a dielectric constant of hydrocarbons, and a 10 dielectric constant of the matrix.
- Element 10 calculating a dielectric constant of water based at least in part on the water salinity.
- Element 11 calculating a refractive index of water based at least in part on the water salinity.
- Element 12 storing the coefficients in a memory.
- Element 13 a user interface coupled to the processor, where the user interface 15 displays the log of water-filled porosity.
- the processor further determines a water salinity of the formation as a function of the temperature, dielectric, and porosity measurements.
- the processor further determines the water-filled porosity based at least in part on salinity and temperature.
- Element 16 a memory that stores temperature dependent function coefficients expressing dependence 20 of water’s dielectric constant on salinity.
- Element 17 where the dielectric measurement tool is a high frequency dielectric measurement tool (HFDT) operating at a frequency of 1 GHz or greater.
- HFDT high frequency dielectric measurement tool
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14883275.1A EP3094819A1 (en) | 2014-02-21 | 2014-02-21 | Determining water salinity and water-filled porosity of a formation |
PCT/US2014/017738 WO2015126416A1 (en) | 2014-02-21 | 2014-02-21 | Determining water salinity and water-filled porosity of a formation |
US15/115,631 US20170167256A1 (en) | 2014-02-21 | 2014-02-21 | Determining Water Salinity and Water-Filled Porosity of a Formation |
MX2016009439A MX2016009439A (en) | 2014-02-21 | 2014-02-21 | Determining water salinity and water-filled porosity of a formation. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/US2014/017738 WO2015126416A1 (en) | 2014-02-21 | 2014-02-21 | Determining water salinity and water-filled porosity of a formation |
Publications (1)
Publication Number | Publication Date |
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WO2015126416A1 true WO2015126416A1 (en) | 2015-08-27 |
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PCT/US2014/017738 WO2015126416A1 (en) | 2014-02-21 | 2014-02-21 | Determining water salinity and water-filled porosity of a formation |
Country Status (4)
Country | Link |
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US (1) | US20170167256A1 (en) |
EP (1) | EP3094819A1 (en) |
MX (1) | MX2016009439A (en) |
WO (1) | WO2015126416A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017048258A1 (en) * | 2015-09-17 | 2017-03-23 | Halliburton Energy Services, Inc. | Real-time determination of formation water-filled porosity using dielectric measurement data |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10732315B2 (en) * | 2017-12-29 | 2020-08-04 | Baker Hughes, A Ge Company, Llc | Real-time inversion of array dielectric downhole measurements with advanced search for initial values to eliminate non-uniqueness |
US11892586B2 (en) | 2022-01-11 | 2024-02-06 | Halliburton Energy Services, Inc. | Interpretation of dielectric tool measurements using general mixing laws |
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- 2014-02-21 EP EP14883275.1A patent/EP3094819A1/en not_active Withdrawn
- 2014-02-21 MX MX2016009439A patent/MX2016009439A/en unknown
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Publication number | Publication date |
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MX2016009439A (en) | 2016-10-13 |
EP3094819A1 (en) | 2016-11-23 |
US20170167256A1 (en) | 2017-06-15 |
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