CN109577958A - Method for evaluating tracing ceramsite fracturing joint width by pulse neutron logging time spectrum - Google Patents
Method for evaluating tracing ceramsite fracturing joint width by pulse neutron logging time spectrum Download PDFInfo
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- CN109577958A CN109577958A CN201811300237.6A CN201811300237A CN109577958A CN 109577958 A CN109577958 A CN 109577958A CN 201811300237 A CN201811300237 A CN 201811300237A CN 109577958 A CN109577958 A CN 109577958A
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- time spectrum
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- 238000001228 spectrum Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000700 radioactive tracer Substances 0.000 claims description 33
- 238000011156 evaluation Methods 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000011504 laterite Substances 0.000 claims description 7
- 229910001710 laterite Inorganic materials 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000009472 formulation Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 1
- 208000021760 high fever Diseases 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a method for evaluating the width of a fracturing seam of tracing ceramsite by using a pulse neutron logging time spectrum, and provides a method for evaluating the width of the fracturing seam of the tracing ceramsite by using the pulse neutron logging time spectrum.
Description
Technical field
The present invention relates to pulse technique field, specially a kind of pulsed neutron log time spectrum evaluation tracer ceramic fracturing seam
Wide method.
Background technique
Tracer ceramic fracturing fracture evaluation technology is mainly used for describing vertical fractures height (proppant lays height).Tracer
Gadolinium (Gd) element in haydite containing high neutron-capture cross section and high capture gamma section, it changes neutron-neutron or neutron-gal
Horse log response can identify man-made fracture height by well-log information before and after comparison pressure break.Although pressure break is that a Xiang Gaoxiao is applied
Work technique, but still have the demand of evaluation near wellbore fracture pattern after pressure break: sometimes due to a variety of causes (such as stratigraphic anormaly,
Perforation holes blocking etc.) certain design fractured intervals are not pressed off effectively；Fracturing fracture is also possible to vertically excessive spread, surpasses
Cross design fractured interval.Accurate evaluation, which presses off crack location (height) and width, facilitates the formulation of this well future measure scheme,
Also contribute to the adjustment of the other well Fracturing Projects of same block.
In fracturing process, tracer haydite there may come a time when to appear in abnormal area, is present in cement sheath or hangs on the borehole wall, this
A little situations influence measurement of the logging instrument to crack where tracer haydite, it is therefore desirable to exclude improper region where tracer haydite
Interference, fracture is monitored.
Chinese patent application 201280054944.6 discloses " the tracer proppant in the subterranean strata crack of positioning induction
The method unrelated with lithology and borehole status ", using from the logging tool with nearly neutron detector and remote neutron detector
Log well stroke before the pressure break of well and after pressure break and the data that obtain are determined doped with high thermal-neutron capture cross-section material
Tracer proppant subterranean strata position/height.What is carried out to the variation between well logging and well logging in wellbore fluid
After standardization needed for any, answered using observing that difference is determining between close/far detector counting rate ratio in two strokes
For the counting rate difference amendment of detector count rate before pressure break, obtains non-interesting region and contain proppant location error.So
Make counting rate record before the pressure break being corrected Chong Die with counting rate record after pressure break afterwards so that after pressure break counting rate record relative to
The presence of proppant is pointed out in the reduction that counting rate records before the pressure break being corrected.
Chinese patent 201710608786.9 discloses " a kind of to be split using the nearly well pressure break of Gd neutron tracer yield imaging in evaluation
The method of seam ", and in particular to petroleum natural gas exploration technical field.This method adds high fever capture cross-section in proppant
Material Gd2O3, acted on using neutron and Gd, by designing combined array gamma Image-forming instrument, obtain the Cd yield of different direction
And wellbore macroscopic capture cross-section, carry out nearly well fracturing fracture imaging.Stratum is by after pressure break, and into stratum, injection is high equipped with having
The Gd of capture cross-section2O3The proppant of material；The mixing gamma energy of different direction is obtained using orientation gamma Image-forming instrument measurement
Spectrum, processing obtains the crack imaging figure of well week Gd yield, and then determines fracture orientation, height, width and inclination angle using it.Relatively
Existing radioactivity and take the assessment techniques such as radioactivity crack, there is the visualization of underground crack identification, "dead" pollution, crack side
Position, height, width and the features such as inclination angle identification is accurate, high sensitivity.
The patent that can be found at present is without utilizing the side of time spectrum evaluation pressure break slit width for pulsed neutron log
Method is provided only the method that time spectrum differentiates fracturing fracture height, or is imaged using Gd element in power spectrum fracture, and evaluation is split
Slit state.This patent is provided after a kind of pulsed neutron log differentiates tracer ceramic fracturing, and tracer haydite stains the borehole wall or cement sheath
Alter slot, it is further provided the means of interpretation of fracturing fracture width more accurately evaluates fracturing fracture height and width can be this well
The formulation of the following measure scheme and more reliable basis is established with the adjustment of the Fracturing Project of block other wells.
Summary of the invention
The purpose of the present invention is to provide a kind of pulsed neutron log time spectrum evaluation tracer ceramic fracturing slit width method,
To solve the problems mentioned in the above background technology.
1. to achieve the above object, the invention provides the following technical scheme: a kind of evaluation of pulsed neutron log time spectrum is shown
The method of track ceramic fracturing slit width, the time spectrum obtained using pulsed neutron log carry out tracer ceramic fracturing fracture width
The method of evaluation, includes the following steps.
S1, logged well using pulsed neutron log instrument to the preceding stratum of pressure break, the logging instrument at least need gamma detector,
Thermal-neutron detector each one, gamma time spectrum and thermal neutron time spectrum are measured respectively.
S2, by stratum hydraulic fracturing, into formation fracture, injection is mixed with the tracer ceramsite propping agent of Gd element.
S3, (well logging before logging speed and pressure of being logged well again using same pulsed neutron log instrument to stratum after pressure break
Unanimously), close, remote gamma time spectrum and thermal neutron time spectrum are measured respectively；
S4, log parameter before and after pressure break is compared, judges that tracer haydite stains internal surface of sleeve pipe or appears in cemented laterite,
Formation fracture height and width is explained further.
According to the above technical scheme, the step S3, respectively to twice well logging obtain time spectrum carry out data processing, from when
Between spectrum in different zones extract the log parameters such as counting rate and capture cross-section.
Compared with prior art, the beneficial effects of the present invention are: the pulsed neutron log time spectrum evaluates tracer haydite pressure
The wide method in crack provides a kind of pulsed neutron log time spectrum, the method for evaluating tracer ceramic fracturing slit width, and goal of the invention is
A kind of time spectrum obtained using pulsed neutron log is provided, judges that tracer haydite stains in casing from extracting parameter in time spectrum
Wall appears in cemented laterite, further evaluates the means of interpretation of tracer ceramic fracturing crack slit width, and effect is to exclude well
Wall stains the interference of tracer haydite and cemented laterite tracer haydite, and accurate evaluation presses off crack location (height) and width, is
The formulation of this well future measure scheme and the adjustment of the other well Fracturing Projects of same block provide effective foundation.
Detailed description of the invention
Fig. 1 is this hair free from flaw stratum, and pressure break surrounding time composes comparison diagram；
Fig. 2 is track haydite supporting crack stratum of the invention, and pressure break surrounding time composes comparison diagram；
Fig. 3 is pressure break surrounding time spectrum comparison diagram in the case of the free from flaw of cemented laterite stratum；
Fig. 4 is in the case of there is tracer haydite supporting crack on cemented laterite stratum, and pressure break surrounding time composes comparison diagram.
Fig. 5 is log parameter extraction algorithm schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the present invention provides a kind of technical solution: a kind of pulsed neutron log time spectrum evaluation tracer haydite
The method of pressure break slit width comments tracer ceramic fracturing fracture width using the time spectrum obtained using pulsed neutron log
The method of valence, comprising the following steps:
S1, it is logged well using pulsed neutron log instrument to the preceding stratum of pressure break, pulsed neutron log instrument used in the present embodiment
Including close, remote two gamma detectors and a thermal-neutron detector, branch measures close, remote gamma time spectrum and thermal neutron time
Spectrum；
S2, by stratum hydraulic fracturing, into formation fracture, injection is mixed with the tracer ceramsite propping agent of Gd element；
S3, (well logging before logging speed and pressure of being logged well again using same pulsed neutron log instrument to stratum after pressure break
Unanimously), close, remote gamma time spectrum and thermal neutron time spectrum are measured respectively, and as Figure 1-Figure 4, respectively different condition pushes
Split front and back gamma time spectrum, thermal neutron time spectrum comparison diagram；
S3, time spectrum progress data processing is obtained to well logging twice respectively, different zones extract counting rate from time spectrum
And the log parameters such as capture cross-section, Fig. 5 illustrate each log parameter extraction algorithm, the numerical value of each curve is shown in Table 1；
The data that table 1 is extracted from Fig. 5 time spectrum
S4, log parameter before and after pressure break is compared, if tracer haydite stains internal surface of sleeve pipe or appears in cemented laterite,
Compared with before pressure break, close after pressure break, remote gamma detector and thermal-neutron detector SB increase, the CI of two gamma detectors and
CB increases, and the CB of thermal-neutron detector is reduced.If tracer haydite supports formation fracture after pressure break, the SF of three each detectors increases
Height, CF are reduced, and the CF reduction of thermal-neutron detector becomes apparent from, and formation fracture width is explained further, sees formula 1-2:
RD=| DA-DB |/DB × 100% (formula 1)
WTP=a (exp (RD/d) -1) (formula 2)
In formula, DA and DB respectively indicate the data (SF or CF) after pressure break and before pressure break, and RD is relative variation；WTPIt is to show
Track haydite supporting crack width, unit cm；A, d is constant.
In the description of the present invention, it is to be understood that, term " coaxial ", " bottom ", " one end ", " top ", " middle part ",
The orientation or positional relationship of the instructions such as " other end ", "upper", " side ", " top ", "inner", " front ", " center ", " both ends " is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " setting ", " connection ", " fixation ",
Terms such as " being screwed on " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be with
It is mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside a element, unless otherwise restricted clearly, for the common of this field
For technical staff, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (2)
1. a kind of method of pulsed neutron log time spectrum evaluation tracer ceramic fracturing slit width, it is characterised in that: using in pulse
The time spectrum that son well logging obtains, the method that tracer ceramic fracturing fracture width is evaluated, comprising the following steps:
S1, it is logged well using pulsed neutron log instrument to the preceding stratum of pressure break, which at least needs gamma detector, heat
Neutron detector each one, gamma time spectrum and thermal neutron time spectrum are measured respectively；
S2, by stratum hydraulic fracturing, into formation fracture, injection is mixed with the tracer ceramsite propping agent of Gd element；
S3, (well logging one before logging speed and pressure of being logged well again using same pulsed neutron log instrument to stratum after pressure break
Cause), close, remote gamma time spectrum and thermal neutron time spectrum are measured respectively；
S4, log parameter before and after pressure break is compared, judges that tracer haydite stains internal surface of sleeve pipe or appears in cemented laterite, into one
Step explains formation fracture height and width.
2. the method for pulsed neutron log time spectrum evaluation tracer ceramic fracturing slit width according to claim 1, feature
Be: the step S3 obtains time spectrum to well logging twice respectively and carries out data processing, and different zones extract meter from time spectrum
The log parameters such as digit rate and capture cross-section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811300237.6A CN109577958A (en) | 2018-11-02 | 2018-11-02 | Method for evaluating tracing ceramsite fracturing joint width by pulse neutron logging time spectrum |
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| CN201811300237.6A CN109577958A (en) | 2018-11-02 | 2018-11-02 | Method for evaluating tracing ceramsite fracturing joint width by pulse neutron logging time spectrum |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566190A (en) * | 2019-09-29 | 2019-12-13 | 西南石油大学 | method for tracking motion trail of intra-slit proppant under high-particle-concentration experimental condition |
| CN112392454A (en) * | 2020-11-16 | 2021-02-23 | 中国石油大学(华东) | Fracture bulk density quantitative calculation method based on neutron activation analysis self-shielding correction |
| CN114086946A (en) * | 2020-08-24 | 2022-02-25 | 中国石油天然气股份有限公司 | Crack height determination method for pressing crack |
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| US20110257948A1 (en) * | 2006-08-09 | 2011-10-20 | Hexion Specialty Chemicals, Inc. | Method and tool for determination of fracture geometry in subterranean formations based on in-situ neutron activation analysis |
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2018
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566190A (en) * | 2019-09-29 | 2019-12-13 | 西南石油大学 | method for tracking motion trail of intra-slit proppant under high-particle-concentration experimental condition |
| CN110566190B (en) * | 2019-09-29 | 2021-02-19 | 西南石油大学 | Method for tracking motion trail of intra-slit proppant under high-particle-concentration experimental condition |
| CN114086946A (en) * | 2020-08-24 | 2022-02-25 | 中国石油天然气股份有限公司 | Crack height determination method for pressing crack |
| CN114086946B (en) * | 2020-08-24 | 2023-08-22 | 中国石油天然气股份有限公司 | Crack height determining method for crack |
| CN112392454A (en) * | 2020-11-16 | 2021-02-23 | 中国石油大学(华东) | Fracture bulk density quantitative calculation method based on neutron activation analysis self-shielding correction |
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Application publication date: 20190405 |