CN104122603A - Method for calibrating coil system in three-dimensional array induction logging instrument - Google Patents
Method for calibrating coil system in three-dimensional array induction logging instrument Download PDFInfo
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Abstract
The invention relates to a method for calibrating a coil system in a three-dimensional array induction logging instrument. The coil system at least includes a transmitting coil and a receiving coil. The method comprises the following steps: placing a calibration platform including an insulating horizontal support and a metal ring arranged at the an insulating horizontal support below the three-dimensional array induction logging instrument; electrifying the transmitting coil to generate an alternating electromagnetic field with a predetermined frequency; in response to the alternating electromagnetic field, generating a signal with the predetermined frequency by the receiving coil through the calibration platform; and according to the amplitude of the signal and an inclination angle and/or an azimuth angle of at least one of the transmitting coil and the receiving coil, executing calibration of the coil system.
Description
Technical field
The manufacture calibration field that the present invention relates to cubical array induction logging instrument, relates more specifically to a kind of method that coil system in cubical array induction logging instrument is calibrated.
Background technology
Nearly 30% hydrocarbon resources is stored in the thin interbedded formation group of sand-mud stone in the world.And the thin interbedded formation hydrocarbon resources of this sand-mud stone is greater than 30% in the shared ratio of China.The thin interbedded formation of sand-mud stone shows as transverse isotropy, longitudinal anisotropy.In the coordinate system of stratum, transverse isotropy (TI) formation conductivity can be expressed as diagonal matrix:
（1）
Wherein,
represent the horizontal conductivity on stratum;
represent vertical conductivity.This stratum is also referred to as transverse isotropy (TI) stratum, its level (laterally) conductivity
with vertical (longitudinally) conductivity
unequal.
Traditional array induction instrument coil system and the parallel or coincidence of borehole axis direction (longitudinal), the one dimension resistivity that can only measure level (horizontal) direction, therefore traditional array induction cannot be assessed the electrical anisotropy characteristic of the thin interbedded formation group of this sand-mud stone.
For measure simultaneously
with
, three-dimensional induction logging instrument arises at the historic moment.At work, transmitting coil is launched alternating electromagnetic field at excitation downhole and the stratum etc. of exchange current surrounding space, and receives the induction electromotive force tensor of nine component secondary electromagnetic field according to electromagnetic induction principle at the receiving coil of this elect magnetic field
:
（2）
Wherein under each component, target first character is transmitting coil direction, and second character is receiving coil direction.By receiving the induction electromotive force from stratum electromagnetism, can obtain horizontal and vertical conductivity and stratigraphic dip and the position angle on stratum, thus significant to the hydrocarbon resources assessment of the thin interbedded formation group of thin layer sand-mud stone.
But, above-mentioned cubical array measurement of inductance requires the coil (for example transmitting coil or receiving coil) of different directions mutually orthogonal, unidirectional coil is mutually coaxial or parallel or coplanar, and this is also the gordian technique that the induction of cubical array induction instrument aratus is manufactured.For example, if different directions transmit and receive non-orthogonal between coil, or same direction coil is not coaxial or not parallel or not coplanar, can cause very large impact to apparatus measures result, thus the hydrocarbon resources assessment of impact to the thin interbedded formation group of thin layer sand-mud stone.
Therefore, there is in the art the method for coil direction being calibrated to realize cubical array measurement of inductance.
Summary of the invention
The object of this invention is to provide a kind of method of the coil in cubical array induction instrument aratus being carried out to fine adjustment.Described method is utilized electromagnetic induction principle, for example, by the instrument (calibration console) of the present invention's design, transmit and receive coil by adjusting three directions, vertical, unidirectional coil direction is coaxial or parallel or coplanar mutually to make the coil direction of different directions.
According to an aspect of the present invention, a kind of method for the coil system of cubical array induction logging instrument is calibrated is provided, described coil system comprises at least transmitting coil and receiving coil, described method comprises: calibration console is arranged in to described cubical array induction logging instrument below, and described calibration console comprises the becket on dielectric level support and described dielectric level support; Make described transmitting coil switch on to produce the alternating electromagnetic field of preset frequency; In response to described alternating electromagnetic field, described receiving coil generates the signal with preset frequency via described calibration console; And according at least one pitch angle and/or the position angle in the amplitude of described signal and transmitting coil and receiving coil, carry out the calibration to described coil system.
According to a further aspect in the invention, described transmitting coil comprises z direction transmitting coil and described receiving coil comprises z ' direction receiving coil.Described transmitting coil energising is comprised makes z direction transmitting coil switch on to produce frequency f
zalternating electromagnetic field.Carry out the calibration of described coil system is comprised by following steps and realizes z ' direction receiving coil and z direction transmitting coil is coaxial: based on the pitch angle of z ' direction receiving coil, make described z ' direction receiving coil around z direction rotation to change its position angle, thereby obtain the frequency f that described z ' direction receiving coil is inducted
zthe curve of signal amplitude and the angle of rotating; And adjust the pitch angle of described z ' direction receiving coil, thereby the amplitude of described curve is minimized.
According to a further aspect in the invention, described receiving coil also comprises x ' direction receiving coil and y ' direction receiving coil.Carry out the calibration of described coil system is also comprised by following steps and makes x ' direction receiving coil keep vertical with y ' direction receiving coil and z direction transmitting coil: adjust respectively x ' direction receiving coil and y ' the direction receiving coil pitch angle with respect to z direction transmitting coil, thus the frequency f that makes respectively x ' direction receiving coil and y ' direction receiving coil induct
zsignal amplitude minimize.
According to a further aspect in the invention, described transmitting coil also comprises x direction transmitting coil and y direction transmitting coil.Described transmitting coil energising is also comprised makes x direction transmitting coil switch on to produce frequency f
xalternating electromagnetic field and make y direction transmitting coil switch on to produce frequency f
yalternating electromagnetic field; And wherein carry out the calibration of described coil system is also comprised: adjust the pitch angle of x direction transmitting coil, the frequency f that z ' direction receiving coil is inducted
xsignal amplitude minimize, and then make x direction transmitting coil and z ' direction receiving coil keep vertical; And the pitch angle of adjustment y direction transmitting coil, the frequency f that z ' direction receiving coil is inducted
ysignal amplitude minimize, and then make y direction transmitting coil and z ' direction receiving coil keep vertical.
According to a further aspect in the invention, carry out the calibration of described coil system is also comprised: (a) taking x direction transmitting coil as benchmark, adjust the position angle of x ' direction receiving coil, the frequency f that x ' direction receiving coil is inducted
xsignal amplitude maximize, and then make x direction transmitting coil and x ' direction receiving coil coplanar; And, the position angle of adjustment y ' direction receiving coil, the frequency f that y ' direction receiving coil is inducted
xsignal amplitude minimize, and then make x direction transmitting coil vertical with y ' direction receiving coil; And (b) taking y ' direction receiving coil as benchmark, adjust the position angle of y direction transmitting coil, the frequency f that y ' direction receiving coil is inducted
ysignal amplitude maximize, and then make y direction transmitting coil and y ' direction receiving coil coplanar.
According to a further aspect in the invention, described coil system also comprises z ' direction potted coil.Carry out the calibration of described coil system is also comprised by following steps and realizes z ' direction potted coil and z direction transmitting coil is coaxial: based on the pitch angle of z ' direction potted coil, make described z ' direction potted coil around z direction rotation, thereby obtain the frequency f that described z ' direction potted coil is inducted
zsignal amplitude and the curve of the angle of rotation; And adjust the pitch angle of described z ' direction potted coil, thereby the amplitude of described curve is minimized.
According to a further aspect in the invention, described coil system also comprises x ' direction potted coil and y ' direction potted coil.Carry out the calibration of described coil system is also comprised by following steps and makes x ' direction potted coil keep vertical with y ' direction potted coil and z direction transmitting coil: adjust respectively x ' direction potted coil and y ' the direction potted coil pitch angle with respect to z direction transmitting coil, thus the frequency f that makes respectively x ' direction potted coil and y ' direction potted coil induct
zsignal amplitude minimize.
According to a further aspect in the invention, carry out the calibration of described coil system is also comprised taking x direction transmitting coil as benchmark: adjust the position angle of x ' direction potted coil, the frequency f that x ' direction potted coil is inducted
xsignal amplitude maximize, and then make x direction transmitting coil and x ' direction potted coil coplanar; And, the position angle of adjustment y ' direction potted coil, the frequency f that y ' direction potted coil is inducted
xsignal amplitude minimize, and then make x direction transmitting coil vertical with y ' direction potted coil.
According to a further aspect in the invention, the position angle of adjustment x ' direction receiving coil is included in adjustment x ' thereby makes calibration console vertical with x direction transmitting coil around instrument described in z direction rotation before the position angle of direction receiving coil.
According to a further aspect in the invention, thus the position angle of adjusting y direction transmitting coil makes calibration console vertical with y direction receiving coil around instrument described in z direction rotation before being included in the position angle of adjusting y direction transmitting coil.
Read in conjunction with the drawings embodiment below, the feature and advantage that the present invention may be better understood.
Brief description of the drawings
Explain embodiments of the invention now with reference to accompanying drawing.It should be noted that these embodiment, for illustrating ultimate principle, make only to illustrate those features essential in order to understand ultimate principle.Accompanying drawing not in scale.In addition, similar label represents similar features in the accompanying drawings in the whole text.
Fig. 1 is according to the desirable schematic diagram of the structure of the coil system in the cubical array induction instrument aratus of the embodiment of the present invention.
Fig. 2 is according to the transmitting coil in a direction in Fig. 1 coil system of the embodiment of the present invention and the schematic diagram of receiving coil.
Fig. 3, comprises Fig. 3 a and 3b, is the schematic diagram of the calibrating installation calibrated according to the direction to coil system of the embodiment of the present invention, the skeleton view that wherein Fig. 3 a is this calibrating installation and vertical view that Fig. 3 b is this calibrating installation.
Fig. 4 a is according to the cubical array induction instrument aratus in Coil Coaxial when calibration of the embodiment of the present invention and the transmission plot of calibrating installation.
Fig. 4 b be according to the receiving coil in Coil Coaxial when calibration of the embodiment of the present invention around the rotation of z axle and with respect to calibrating installation the front view in diverse location.
Fig. 4 c is the signal that obtains according to the receiving coil in Coil Coaxial when calibration of the embodiment of the present invention and the curve map of the anglec of rotation.
Fig. 5 is according to the schematic diagram of the cubical array induction instrument aratus in the coil of the embodiment of the present invention orthogonal when calibration.
Fig. 6 is according to the cubical array induction instrument aratus in the coil of the embodiment of the present invention coplanar when calibration and the schematic diagram of calibrating installation.
Embodiment
The following specifically describes and relate to accompanying drawing, these accompanying drawings are shown and can be implemented detail of the present invention and embodiment by diagramatic way.Fully specifically describe these embodiment to enable those skilled in the art to implement the present invention.Can utilize other embodiment and can carry out structure, logic and electricity and change and do not depart from the scope of the present invention.Various embodiment may not mutual exclusion, because some embodiment can combine to form new embodiment with one or more other embodiment.
Reference forms the accompanying drawing of the part of this detailed description in the following detailed description, in described accompanying drawing, is shown and wherein can be put into practice specific embodiments of the invention by the mode of explanation.In this respect, used the direction term such as " top ", " end ", 'fornt', 'back', " head ", " tail " etc. with reference to the orientation of described accompanying drawing.Because the assembly of embodiment can be positioned in several different orientation, therefore described direction term is used to the object of explanation and limits anything but.It being understood that the change that can utilize other embodiment and can make structure or logic in the situation that not deviating from scope of the present invention.Therefore, detailed description is not below considered as to restrictive, sense, and scope of the present invention is limited by appended claims.
Unless it being understood that concrete Stated otherwise, otherwise the feature of each exemplary embodiment as described herein can combination with one another.It should be understood that the only unrestricted technical scheme of the present invention in order to explanation of embodiment.Although the present invention is had been described in detail with reference to embodiment, but those of ordinary skill in the art is to be understood that: still can modify or be equal to replacement the present invention, and do not depart from the spirit and scope of the present invention, and claims are intended to contain and fall into these amendments of spirit and scope of the invention or be equal to replacement.
As the term being adopted in this manual " m direction A coil " refer to as described in the orientation of its axis m direction of A coil, unless context indicates in addition.
As the term being adopted in this manual " A coil and B coil angulation " or " A coil is with respect to the angle of B coil " refer to the axis of A coil and the axis angulation of B coil, unless context indicates in addition.
For example, as the term being adopted in this manual " pitch angle of A coil " refers to axis and z direction (, the being generally instrument axis direction) angulation of A coil, unless context indicates in addition.
The axis that refers to A coil as the term being adopted in this manual " position angle of A coil " in x-y plane with x axle angulation, unless context indicates in addition.
As the term being adopted in this manual " A ' direction " refers to the direction that has difference slightly with A direction and need calibration, sometimes use interchangeably, unless context indicates in addition.
Main thought of the present invention is: calibration console is arranged in to described cubical array induction logging instrument below, and described calibration console comprises the becket on dielectric level support and described dielectric level support; Make described transmitting coil switch on to produce the alternating electromagnetic field of preset frequency; In response to described alternating electromagnetic field, described receiving coil generates the signal with preset frequency via described calibration console; And according at least one pitch angle and/or the azimuthal relation in the amplitude of described signal and transmitting coil and receiving coil, carry out the calibration to described coil system, comprise coaxial calibration, orthogonal calibration and coplanar calibration etc.
Next, specifically explain embodiments of the invention with reference to accompanying drawing.
As shown in Figure 1, Fig. 1 is according to the desirable schematic diagram of the structure of the coil system 100 in the cubical array induction instrument aratus of the embodiment of the present invention.As shown in Figure 1, the coil system 100 of three-dimensional induction logging instrument comprises the transmitting coil of three orthogonal vertical
,
,
receiving coil with three orthogonal vertical
,
,
.Alternatively, the coil system 100 of three-dimensional induction logging instrument can also comprise the potted coil of three orthogonal vertical
,
,
, as shown in the dotted line frame 110 in Fig. 1.In the ideal case, implementing calibration of the present invention (as more described in detail) below afterwards, transmitting coil, potted coil and the receiving coil of z direction are coaxial, and the transmitting coil of the transmitting coil of x direction, potted coil and receiving coil and y direction, potted coil and receiving coil are coplanar respectively, wherein L1 represents the distance of transmitting coil axis and receiving coil axis, and L2 represents the distance of transmitting coil axis and potted coil axis.
In operation, the potted coil of three orthogonal vertical
,
,
be used for shielding the direct-coupling of transmitting coil and receiving coil, make transmitting coil to the surrounding space such as well and stratum transmitting alternating electromagnetic field, thereby receiving coil receive the signal of alternating electromagnetic field through stratum reflection.Certainly, can for example adopt in practice the element with similar function of shielding such as baffle plate is realized the direct-coupling of transmitting coil and receiving coil.
In addition,, because potted coil and receiving coil are similarly with regard to calibration steps of the present invention, therefore the direction between receiving coil and transmitting coil or angle calibration system are also applicable to direction or the angle calibration system between potted coil and transmitting coil.In addition, before carrying out coil direction fine setting of the present invention, can adjust coil position of the present invention, make receiving coil and transmitting coil and optional potted coil roughly in the position shown in Fig. 1.For example, realize the adjustment of above-mentioned geometric position by means such as mechanical gage or observations.
Fig. 2 is according to the schematic diagram of the transmitting coil 210 in a direction in Fig. 1 coil system of the embodiment of the present invention and receiving coil 220.As shown in Figure 2, z ' direction receiving coil 220 is z axle α at angle with z direction transmitting coil 210.According to electromagnetic induction principle, if known receiving coil 220 and transmitting coil 210 at intervals (are shown D) in Fig. 2, only some can arrive receiving coil to the magnetic flux (illustrating with magnetic line of force B in Fig. 2) that transmitting coil 210 produces so, reaches the object of delivery of electrical energy.The magnetic flux B that receiving coil receives is more, shows that two degree of coupling between coil are higher, and the signal inducted is just stronger.
Conventionally, coupling rank represent with coupling factor k, coupling factor is a value between 0 and 1, wherein 1 expression unity couping, at this moment the magnetic flux B that transmitting coil produces all received coil receives, and separate system between 0 expression transmitting coil and receiving coil.Distance between coupling factor and two coils is relevant, also relevant with the angle between them with the shape of coil with their relative size.For the present invention, when α is 0 while spending, the coupling maximum between two coils, and when α be 90 while spending, the coupling minimum between two coils, both of these case is reflected as respectively maximal value and the minimum value of the received signal of receiving coil.
Next with reference to figure 3, Fig. 3 is the schematic diagram of the calibrating installation 300 calibrated according to the direction to coil system of the embodiment of the present invention, and wherein Fig. 3 a is the skeleton view of this calibrating installation 300 and Fig. 3 b is the vertical view of this calibrating installation 300.Calibrating installation 300 comprises the becket 320 on dielectric level support 310 and described dielectric level support.For example, becket 320 can be formed and is used for strengthening the coupling between transmitting coil and receiving coil to be calibrated by metal materials such as copper, aluminium, iron, and this will discuss below in more detail.For example, the shape of becket 320 can be circular, oval or other closed-curve shape.Dielectric level support 310 can be used for regulating calibrating installation parallel with ground to guarantee becket 320.
Fig. 4 a is according to the cubical array induction instrument aratus 420 in Coil Coaxial when calibration of the embodiment of the present invention and the transmission plot of calibrating installation 300.As shown in Fig. 4 a, for simplicity's sake, be calibrated to example with z direction Coil Coaxial, only show z direction transmitting coil
with z direction receiving coil
and optional z direction potted coil
(illustrating with dashed rectangle 401 in the drawings).As shown in the figure, calibrating installation 300 is placed on cubical array induction instrument aratus 420 belows and is arranged so that z direction transmitting coil
be that z axle is parallel to described calibrating installation 300.Described calibrating installation 300 can adopt example structural arrangement as shown in Figure 3.
With reference to figure 4b, show the receiving coil while calibration according to the Coil Coaxial of the embodiment of the present invention simultaneously
the front view in diverse location I and II around the rotation of z axle and with respect to calibrating installation 410.As shown in Figure 4 b, receiving coil in the time of the I of position
the standard apparatus 410 of leaving school is far away, therefore receiving coil
the signal of inducting should be less, corresponding to the A point in the curve as shown in Fig. 4 c; And in the time of the II of position receiving coil
the standard apparatus 410 of leaving school is nearer, therefore receiving coil
the signal of inducting should be larger, and corresponding to the B point in the curve as shown in Fig. 4 c, wherein transmitting coil and receiving coil by the becket 320 in calibrating installation 410, the effect of secondary electromagnetic induction occurs by path P 1.
Fig. 4 c is according to the receiving coil in Coil Coaxial when calibration of the embodiment of the present invention
the curve map of the signal epsilon obtaining and anglec of rotation φ.In conjunction with reference to figure 4a, 4b and 4c, as an example of z direction transmitting coil and receiving coil example, concrete Coil Coaxial calibration process is described as follows:
(1) first, for example can pass through z direction transmitting coil
apply alternating voltage or electric current, make z direction transmitting coil
energising is to produce frequency f
zalternating electromagnetic field;
(2) then, described alternating electromagnetic field is directly coupled to receiving coil and is coupled to receiving coil by path P 1 by calibrating installation on the other hand on the one hand.For the inclined angle alpha of z ' direction receiving coil, make described z ' direction receiving coil around z direction rotation, thereby obtain the frequency f that described z ' direction receiving coil is inducted
zsignal amplitude ε and the curve 450 of anglec of rotation φ;
(3) then, adjust the inclined angle alpha of described z ' direction receiving coil, thereby the amplitude d of described curve 450 is minimized, z ' direction receiving coil and z direction transmitting coil are coaxial.
Equally, above-mentioned coaxial calibration process can be applied to potted coil, as long as the receiving coil in said process is replaced by potted coil.
Next with reference to figure 5, show the schematic diagram of the cubical array induction instrument aratus 520 while calibration according to the coil of the embodiment of the present invention is orthogonal.As shown in the figure, in the time of the orthogonal calibration of coil, calibrating installation is optional.In this example, remove above-mentioned calibrating installation and only drawn cubical array induction instrument aratus 520.In this example, with x direction reflection coil
with z direction receiving coil
the orthogonal example that is calibrated to the orthogonal calibration process of coil is described.
With z direction receiving coil
be as the criterion, start the orthogonal calibration process of following coil:
(1) make x direction transmitting coil
energising is to produce frequency f
xalternating electromagnetic field;
(2) adjust x direction transmitting coil
pitch angle (not shown in Fig. 5), make z direction receiving coil
the frequency f of inducting
xsignal amplitude ε (as shown in Fig. 4 a) minimize, that is, make x direction transmitting coil
with z direction receiving coil
keep vertical.
Equally, the orthogonal calibration process of above-mentioned coil also can be applied to y direction transmitting coil and z direction receiving coil
orthogonal calibration.Particularly, this for example realizes as follows: make y direction transmitting coil switch on to produce frequency f
yalternating electromagnetic field; And the pitch angle of adjustment y direction transmitting coil, the frequency f that z ' direction receiving coil is inducted
ysignal amplitude minimize, that is, make y direction transmitting coil and z ' direction receiving coil keep vertical.
In addition, the orthogonal calibration process of above-mentioned coil also can be applied to the calibration of x ' direction receiving coil and y ' direction receiving coil to make they and z direction transmitting coil orthogonal.For example, by adjusting respectively x ' direction receiving coil and y ' the direction receiving coil pitch angle with respect to z direction transmitting coil, thus the frequency f that makes respectively x ' direction receiving coil and y ' direction receiving coil induct
zsignal amplitude minimize, that is, make respectively x ' direction receiving coil and y ' direction receiving coil and z direction transmitting coil keep vertical.In addition, also can be as the criterion with z direction transmitting coil, similarly x ' direction and y ' direction potted coil (in the dashed rectangle 501 in Fig. 5, not shown) be carried out to similar orthogonal calibration, if comprise potted coil, not repeat them here.
Fig. 6 is according to the cubical array induction instrument aratus 620 in the coil of the embodiment of the present invention coplanar when calibration and the schematic diagram of calibrating installation 610.
As shown in Figure 6, calibrating installation 610 is placed on cubical array induction instrument aratus 620 belows and is arranged so that x direction transmitting coil
perpendicular to described calibrating installation 600.Described calibrating installation 600 can adopt example structural arrangement as shown in Figure 3.Instrument transmitting coil
transmission of electromagnetic signals produces secondary field by calibrating installation 600, and receiving coil receives the secondary field of calibrating installation and produces induced signal, and the size of described signal is along with receiving coil R
xposition angle and change.As receiving coil R
xduring perpendicular to calibrating installation 600, the signal maximum receiving, i.e. coplanar situation; And as receiving coil R
xwhile being parallel to calibrating installation 600, the signal minimum receiving, i.e. orthogonal situation.
Below with x direction transmitting coil
be as the criterion, to x ' direction receiving coil R
xposition angle adjust, make x ' direction receiving coil R
xthe frequency f of inducting
xsignal amplitude ε maximize, that is, make x direction transmitting coil
and x ' direction receiving coil R
xcoplanar.
In Fig. 6, with dotted line frame 601, potted coil is shown, can carry out similarly x ' direction potted coil B
xcoplanar calibration.Equally, can be to the transmitting coil of y direction and receiving coil and the similar coplanar calibration of optional potted coil execution, wherein difference is to make y direction transmitting coil T
yperpendicular to described calibrating installation 600.
Then, utilize above-mentioned orthogonal calibration process, with x direction transmitting coil
be as the criterion, adjust the position angle of y ' direction receiving coil, the frequency f that y ' direction receiving coil is inducted
xsignal amplitude minimize, that is, make x direction transmitting coil vertical with y ' direction receiving coil.
In this way, utilize the combination of above-mentioned coaxial calibration, orthogonal calibration and coplanar calibration, can realize the various direction calibrations of each coil to comprising various coil systems.
For example, according to one embodiment of present invention, in the time that the coil system in cubical array induction logging instrument comprises X, Y and Z direction transmitting coil, potted coil and receiving coil, concrete calibration steps is summarised as: use calibration platform, adjust the transmitting of Z direction, shielding and receiving coil coaxial, its mode is to adjust the pitch angle of shielding and receiving coil; Transmit and receive coil as benchmark taking Z direction, adjust the pitch angle of X, Y-direction transmitting, shielding and receiving coil, make X, Y-direction coil and Z direction keep vertical; Taking the transmitting coil of directions X as benchmark, adjust the shielding of directions X and the position angle of receiving coil, make directions X transmitting, shielding and receiving coil coplanar; Taking the transmitting coil of directions X as benchmark, adjust the shielding of Y-direction and the position angle of receiving coil, make Y-direction reception vertical with directions X with potted coil; Taking the receiving coil of Y-direction as benchmark, adjust the position angle of y direction transmitting coil, make the transmitting of y direction, shielding and receiving coil coplanar.Note, the adjustment at position angle and/or pitch angle can complete manually or automatically.
Utilize calibration steps of the present invention, the coil (for example transmitting coil or receiving coil) that can realize different directions is mutually orthogonal, unidirectional coil is mutually coaxial or parallel or coplanar, for cubical array induction instrument aratus provides good measurement performance, thereby can correctly obtain horizontal and vertical conductivity and stratigraphic dip and the position angle on stratum, and then significant to the hydrocarbon resources assessment of the thin interbedded formation group of thin layer sand-mud stone.
Use space relative terms such as " below ", " below ", D score, " on ", " on " etc. to explain that an elements relative is in the location of the second element for ease of explanation.Except being different from the orientation of those orientations of describing in the drawings, these terms are intended to contain the difference orientation of device.In addition, term such as " first ", " second " etc. are also used to describe various elements, region, part etc., and to be also not intended to be restrictive.Run through instructions, similarly the similar element of term reference.
As used herein, term " has ", " containing ", " comprising ", " comprising " etc. are the existence of the instruction element of stating or feature but do not get rid of other element or the open-ended term of feature.Article " one ", " one " and " being somebody's turn to do " are intended to comprise plural number and odd number, unless context clearly separately has instruction.
Illustrate and described various exemplary embodiment of the present invention although above with reference to accompanying drawing, those skilled in the art will realize clear can making the various changes of some advantages of the present invention and amendment and not depart from the spirit and scope of the present invention.Therefore, as long as within these amendments of the present invention, modification and replacement belong to the scope of claims of the present invention and equivalent technical solutions thereof, the present invention is also intended to comprise these amendments, modification and replacement.In addition, with regard to describe in detail or claims in use that term " comprises ", " having ", " with " or their other variants, such term intention is inclusive " to comprise " similarly mode with term.
In addition, term " exemplary " only means as an example, instead of best or optimum.Also to recognize, the feature described here and/or element be for simple and understandable object with shown in specific dimensions relative to each other, actual size may be from shown size be significantly different here.
This area rational technique personnel will understand, can suitably replace with other parts of carrying out identical function.Even if it should be mentioned that in those situations of not yet clearly mentioning this point, the feature of explaining with reference to concrete figure can with the Feature Combination of other figure.Like this amendment of inventive concept is intended to be covered by claims.
In addition, the application's scope is not intended to be limited to the specific embodiment of process, machine, manufacture, material composition, device, method and the step described in instructions.As those of ordinary skill in the art easily recognize open from of the present invention, can utilize according to the present invention carry out identical in fact function with corresponding embodiment described herein or realize identical in fact result, current existence or later process leaved for development, machine, manufacture, material composition, device, method or step.Accordingly, claims are intended to comprise these processes, machine, manufacture, material composition, device, method or step within the scope of it.
Claims (10)
1. the method for the coil system of cubical array induction logging instrument is calibrated, described coil system comprises at least transmitting coil and receiving coil, described method comprises:
Calibration console is arranged in to described cubical array induction logging instrument below, and described calibration console comprises the becket on dielectric level support and described dielectric level support;
Make described transmitting coil switch on to produce the alternating electromagnetic field of preset frequency;
In response to described alternating electromagnetic field, described receiving coil generates the signal with preset frequency via described calibration console; And
According at least one pitch angle and/or the position angle in the amplitude of described signal and transmitting coil and receiving coil, carry out the calibration to described coil system.
2. method according to claim 1, wherein said transmitting coil comprises z direction transmitting coil and described receiving coil comprises z ' direction receiving coil; And wherein making described transmitting coil energising comprise makes z direction transmitting coil switch on to produce frequency f
zalternating electromagnetic field; And wherein carry out the calibration of described coil system comprised by following steps and realizes z ' direction receiving coil and z direction transmitting coil is coaxial:
Based on the pitch angle of z ' direction receiving coil, make described z ' direction receiving coil around z direction rotation to change its position angle, thereby obtain the frequency f that described z ' direction receiving coil is inducted
zthe curve of signal amplitude and the angle of rotating; And
Adjust the pitch angle of described z ' direction receiving coil, thereby the amplitude of described curve is minimized.
3. method according to claim 2, wherein said receiving coil also comprises x ' direction receiving coil and y ' direction receiving coil, and wherein carries out the calibration of described coil system is also comprised by following steps and makes x ' direction receiving coil and y ' direction receiving coil and z direction transmitting coil keep vertical:
Adjust respectively x ' direction receiving coil and y ' the direction receiving coil pitch angle with respect to z direction transmitting coil, thus the frequency f that makes respectively x ' direction receiving coil and y ' direction receiving coil induct
zsignal amplitude minimize.
4. method according to claim 3, wherein said transmitting coil also comprises x direction transmitting coil and y direction transmitting coil; And wherein making described transmitting coil energising also comprise makes x direction transmitting coil switch on to produce frequency f
xalternating electromagnetic field and make y direction transmitting coil switch on to produce frequency f
yalternating electromagnetic field; And wherein carry out the calibration of described coil system also comprised:
Adjust the pitch angle of x direction transmitting coil, the frequency f that z ' direction receiving coil is inducted
xsignal amplitude minimize, and then make x direction transmitting coil and z ' direction receiving coil keep vertical; And
Adjust the pitch angle of y direction transmitting coil, the frequency f that z ' direction receiving coil is inducted
ysignal amplitude minimize, and then make y direction transmitting coil and z ' direction receiving coil keep vertical.
5. method according to claim 4, wherein carry out the calibration of described coil system is also comprised:
Taking x direction transmitting coil as benchmark, adjust the position angle of x ' direction receiving coil, the frequency f that x ' direction receiving coil is inducted
xsignal amplitude maximize, and then make x direction transmitting coil and x ' direction receiving coil coplanar; And, the position angle of adjustment y ' direction receiving coil, the frequency f that y ' direction receiving coil is inducted
xsignal amplitude minimize, and then make x direction transmitting coil vertical with y ' direction receiving coil; And
Taking y ' direction receiving coil as benchmark, adjust the position angle of y direction transmitting coil, the frequency f that y ' direction receiving coil is inducted
ysignal amplitude maximize, and then make y direction transmitting coil and y ' direction receiving coil coplanar.
6. method according to claim 5, wherein said coil system also comprises z ' direction potted coil, and wherein carries out the calibration of described coil system is also comprised by following steps and realizes z ' direction potted coil and z direction transmitting coil is coaxial:
Based on the pitch angle of z ' direction potted coil, make described z ' direction potted coil around z direction rotation, thereby obtain the frequency f that described z ' direction potted coil is inducted
zsignal amplitude and the curve of the angle of rotation; And
Adjust the pitch angle of described z ' direction potted coil, thereby the amplitude of described curve is minimized.
7. method according to claim 6, wherein said coil system also comprises x ' direction potted coil and y ' direction potted coil, and wherein carries out the calibration of described coil system is also comprised by following steps and makes x ' direction potted coil and y ' direction potted coil and z direction transmitting coil keep vertical:
Adjust respectively x ' direction potted coil and y ' the direction potted coil pitch angle with respect to z direction transmitting coil, thus the frequency f that makes respectively x ' direction potted coil and y ' direction potted coil induct
zsignal amplitude minimize.
8. method according to claim 7, wherein carry out the calibration of described coil system is also comprised taking x direction transmitting coil as benchmark:
Adjust the position angle of x ' direction potted coil, the frequency f that x ' direction potted coil is inducted
xsignal amplitude maximize, and then make x direction transmitting coil and x ' direction potted coil coplanar; And,
Adjust the position angle of y ' direction potted coil, the frequency f that y ' direction potted coil is inducted
xsignal amplitude minimize, and then make x direction transmitting coil vertical with y ' direction potted coil.
9. method according to claim 5, the position angle of wherein adjusting x ' direction receiving coil be included in adjust x ' thus before the position angle of direction receiving coil, make calibration console vertical with x direction transmitting coil around instrument described in z direction rotation.
10. method according to claim 8, thus the position angle of wherein adjusting y direction transmitting coil makes calibration console vertical with y direction receiving coil around instrument described in z direction rotation before being included in the position angle of adjusting y direction transmitting coil.
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