CN104005758B - Resistivity simulation cell cube and its manufacturing method - Google Patents
Resistivity simulation cell cube and its manufacturing method Download PDFInfo
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- CN104005758B CN104005758B CN201310061919.7A CN201310061919A CN104005758B CN 104005758 B CN104005758 B CN 104005758B CN 201310061919 A CN201310061919 A CN 201310061919A CN 104005758 B CN104005758 B CN 104005758B
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Abstract
The present invention relates to resistivity simulation cell cube and its manufacturing methods.Specifically, it provides a kind of for simulating the resistivity simulation cell cube of underground formation at target locations resistivity, is made of cement, one or more conductive materials and water.Moreover, additionally providing a kind of method for manufacturing the resistivity simulation cell cube comprising following steps: a. provides cement, one or more conductive materials and water；B. conductive materials, cement and water are stirred, are made into mixture；C. mixture is molded, is made into green body；D. the green body after being molded is placed in conformal maintenance a period of time in the base tool of a respective shapes；E. drying and processing is carried out to the green body after conformal maintenance.Resistivity simulation cell cube of the invention can accurate simulation underground different target stratum corresponding resistor rate, and multiple resistivity simulation cell cubes can combine the different resistivity for simulating the entire down-hole formation of any depth.
Description
Technical field
The present invention relates to geophysical probing techniques, more particularly to resistivity logging technology.
Background technique
During geological drilling, different geophysicses can be used to the stratum of underground different depth, different lithology
Detection Techniques.In various geophysical probing techniques, the resistivity for measuring formation at target locations is difference different lithology, discovery underground
One of the important means of oil, gas and water resource.
It being constantly progressive as logging technique is horizontal, batch message amount is big, the small device for subsurface measuring of radius of investigation, such as
Underground acoustic-electric Image-forming instrument, underground microresistivity scanner etc., are researched and developed successfully in succession.These device for subsurface measuring resolution ratio
Height, the down-hole information amount provided is big, provides an important basis to verify underground Complicated Geologic Condition.
But in the prior art, the device for subsurface measuring developed demarcated, verified to detect these instruments
When reliability, consistency, or for the instrument underground survey data work out respective explanations software parameter foundation is provided when, it is necessary to
It is carried out to actual wellbore scene.Not only expense is high for this work, time and effort consuming, and demarcates, verification and provided ginseng
Number may be also not ideal enough in accuracy and consistency according to itself, in some instances it may even be possible to can not find available appropriate wellbore to implement
This work.
It is instrument underground survey data solution that is, how to be demarcated, be verified to the device for subsurface measuring developed
The establishment for releasing software provides parameter foundation and has become a great problem urgently to be solved in this field.
Summary of the invention
It is an object of the present invention to establish the various different resistivities in a set of simulation underground, Different Strata thickness on ground
Device, easily to be demarcated, be verified to the downhole instrument developed, convenient for the instrument underground survey data interpretation
The establishment of software provides accurately and reliably parameter foundation.
Another object of the present invention is to provide for one kind being capable of accurate simulation underground different target stratum corresponding resistor rate
Unit and its manufacturing method, the different resistivity of entire down-hole formation for simulating any depth can be combined.
A further object of the present invention is to use the unit for simulating underground different target stratum corresponding resistor rate
Resistivity keeps relative stability in the process, and the influence of ambient humidity is minimized.
A further object of the present invention is to simulate the cellular construction letter of underground different target stratum corresponding resistor rate
It is single, and convenient for forming corresponding section and can easily relative positioning.
A further object of the present invention is to can be used for the unit for simulating underground different target stratum corresponding resistor rate
Detect one or more characteristic index of the device for subsurface measuring.
To realize at least one above-mentioned purpose, the present invention provides a kind of for simulating the electricity of underground formation at target locations resistivity
Resistance rate analogue unit body, which is characterized in that the resistivity simulation cell cube is by cement, one or more conductive materials and water system
At.
Preferably, the conductive materials are particle and/or powder type.
Preferably, the conductive materials are graphite powder.
The ratio of the cement and graphite powder that are preferably made from the resistivity simulation cell cube is in 60:40 to 83.5:
According to the selection of the size of formation at target locations resistivity in the range of 16.5.
Preferably, on a surface of the resistivity simulation cell cube have at least one locally calibration feature, with
In the one or more characteristic index for detecting the device for subsurface measuring.
Preferably, the part calibration feature includes having multiple grooves and/or the hole of different geometrical size and/or orientation
Hole.
The present invention also provides a kind of methods for manufacturing the resistivity simulation cell cube comprising following steps: a. is mentioned
For cement, one or more conductive materials (preferably graphite powder) and water；B. to the conductive materials, the cement and described
Water is stirred, and is made into mixture；C. the mixture is molded, is made into green body；It d. will molding
The green body after molding is placed in conformal maintenance a period of time in the base tool of a respective shapes；E. to described in after conformal maintenance
Green body carries out drying and processing.
Preferably, the time for carrying out the conformal maintenance is 72 hours or more；
Preferably, when carrying out the drying and processing, the green body is placed in 150 DEG C of environment 8 hours or more.
Preferably, the method further includes following steps: f. is saturated to by the green body of the drying and processing
Leaching insulation oil processing.
Preferably, the insulating oil is high melting point paraffin；When carrying out the saturation leaching insulation oil processing, first by the Gao Rong
Point heating paraffin is fused into the paraffin oil of liquid, then will be completely immersed in the paraffin oil by the green body of the drying and processing
In.
Preferably, by the green body of the drying and processing immerse the time in the paraffin oil be 0.5-2.0 hours between,
So that the paraffin oil can be sufficiently submerged in the green body, the intracorporal hole of the base is filled.
The ground calibration equipment of simulation down-hole formation resistivity of the invention can establish a set of simulation underground on the ground
Various different resistivities, the device of Different Strata thickness.Utilize the device, it is convenient to mark to the downhole instrument developed
Fixed, verification, the establishment convenient for instrument underground survey data interpretation software provide accurately and reliably parameter foundation.
Resistivity simulation cell cube of the invention can accurate simulation underground different target stratum corresponding resistor rate, these
Resistivity simulation cell cube can combine the different resistivity for simulating the entire down-hole formation of any depth.Moreover, should
It being capable of stable for extended periods of time in resistivity simulation cell cube use process.
In addition, resistivity simulation Unit agent structure of the invention is simple, it, can be easily opposite convenient for forming corresponding section
Positioning, and can also be used in the one or more characteristic index for detecting the device for subsurface measuring.
According to the accompanying drawings to the detailed description of the preferred embodiment of the present invention, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Hereinafter will referring to attached drawing and by it is exemplary and not restrictive in a manner of the preferred embodiment of the present invention is carried out it is detailed
It describes, identical appended drawing reference denotes same or similar part or part in attached drawing.It will be understood by those skilled in the art that
It is that these attached drawings are not necessarily to be drawn to scale.In attached drawing:
Fig. 1 shows the ground calibration equipment of simulation down-hole formation resistivity in accordance with a preferred embodiment of the present invention
Side schematic sectional view；
Fig. 2 is the schematic end of resistivity simulation section in the down-hole formation simulation main body of face calibration equipment as shown in Figure 1
View；
Fig. 3 is the side schematic sectional view of a part of resistivity simulation section shown in Fig. 2；
Fig. 4 is the schematic of borehole wall image checking section in the down-hole formation simulation main body of face calibration equipment as shown in Figure 1
End-view；
Fig. 5 is the schematic A-A cross-sectional view of the section a part of borehole wall image checking shown in Fig. 4；
Fig. 6 is the schematic B-B cross-sectional view of the section a part of borehole wall image checking shown in Fig. 4；
Fig. 7 is the schematic end of annular element body in accordance with a preferred embodiment of the present invention；
Fig. 8 is the side schematic sectional view of annular element body shown in Fig. 7.
Specific embodiment
Referring to Fig. 1, the ground calibration equipment packet of simulation down-hole formation resistivity in accordance with a preferred embodiment of the present invention
Including circumferentially closed outer shaft wall 10(may be, for example, closed steel pressure-bearing bucket) and the underground of 10 radially inner side of outer shaft wall is set
Simulate main body 20 in stratum.Preferably, it is provided with centralizer 15 between outer shaft wall 10 and down-hole formation simulation main body 20, by well
Lower stratum simulation main body 20 suitably (usually with central axial line) is fixed together with outer shaft wall 10, to avoid on ground
During use, lifting of calibration equipment etc., down-hole formation simulates the entirety of main body 20 or part is subjected to displacement and/or deformation.
As well known to the skilled person, along the axial direction of outer shaft wall 10 preferably settable multiple centralizers 15.Each centralizer
15 may be, for example, an integrated support structure in itself, or can also be made of multiple separating members, and specific structure is this field skill
Known to art personnel, to this, it will not go into details herein.
In addition, as skilled in the art will understand, such as install ground of the invention in verification place and verify
After device, (including the possible instrument space of main body 20 and well are being simulated to down-hole formation before use, need into outer shaft wall 10
In gap between lower stratum simulation main body 20 and outer shaft wall 10) inject the liquid for simulating down-hole formation liquid environment.These liquid
Body for example can be Chinese national standard 35# diesel oil, or can be other hydrocarbon liquids with electrical insulation characteristics, it might even be possible to be
According to the oil-base mud drilling fluid that actual demand matches, other substrate drilling fluids, including water-base mud drilling fluid can also be.For side
Just it describes, these liquid is known as " liquid in well " in the application.
In general, outer shaft wall 10 along its axial direction has first end 11 and axially opposing second with the first end
End 12.Obviously, in order to inject into well liquid into down-hole formation simulation main body 20 and be passed in and out for device for subsurface measuring, wherein institute
Stating first end is open end.
Preferably, a circumferentially closed liquid reserve tank 40, the liquid reserve tank edge are provided in the first end 11 of outer shaft wall 10
Its axial direction has first end face and the second end face axially opposing with the first end face.The first end face of liquid reserve tank 40 and
Second end face is respectively provided with the first central opening and the second central opening, and first central opening into outer shaft wall for injecting
It liquid and is passed in and out for device for subsurface measuring in well, and second central opening is then circumferentially sealed fixation along its edge
On (such as passing through welding) to the outer surface of the first end 11 of outer shaft wall 10.It is very advantageous that such liquid reserve tank 40 is at it
Define an interim liquid storage space, inside to be housed in the liquid that may overflow outer shaft wall 10 when calibration equipment use of the invention
Body avoids the liquid overflowed from flowing in ambient enviroment, and these liquid then may also allow for be flowed back in outer shaft wall 10 again.Example
Such as, (specifically, usually merging down-hole formation simulates main body when device for subsurface measuring to be tested being suspended in outer shaft wall 10
In 20 possible instrument spaces), liquid portion in the well wherein having been injected into before may be made to overflow, this partially liq of spilling
It can temporarily be housed in liquid reserve tank 40, without flowing into environment space；And after having withdrawn from device for subsurface measuring to be tested, temporarily
When this partially liq for being housed in liquid reserve tank 40 can flow back to again in outer shaft wall 10 again.
Lifting operation is carried out to ground calibration equipment of the invention in order to facilitate external hanging device (such as crane), preferably
It can be near the first end 11 of outer shaft wall 10 or a lifting components are arranged in the first end face of liquid reserve tank 40 at circumferential edge
45.In one embodiment, lifting components 45, which can be, is fixed symmetrically to 40 first end face of liquid reserve tank at circumferential edge
Multiple hoisting rings.For example, can be hung on hoisting ring with crane after assembling ground calibration equipment, ground calibration equipment is put
Enter a temperature environment preferably remain in metastable underground well (usually the first end 11 of outer shaft wall 10 upward, and
Two ends 12 are downward).
As skilled in the art will understand, here so-called " underground well " not carry out practical geological prospecting or
The subterranean bore hole of resource exploitation, but one for being used to contain calibration equipment of the present invention for excavating and/or building in verification place
" container ".It is preferred that should " container " be built in underground, but the considerations of be for economic or environment etc., and nonessential
's.Therefore, although in certain practical applications, calibration equipment of the invention is likely to be brought into so-called " underground well ",
It is to those skilled in the art, due to no longer needing to carry out into the subterranean bore hole of practical geological prospecting or resource exploitation
Calibration/verification of instrument, thus calibration equipment of the invention is still considered as being a kind of " ground calibration equipment ".
In preferred embodiment shown in Fig. 1, the second end 12 of outer shaft wall 10 is also an open end, is provided with one
A terminating set 50 with draining valve 51, to close the opening of second end 12, and allows to have been injected into the well in outer shaft wall
Interior liquid can be discharged under the control of draining valve 51, liquid in the well more renewed with the requirement verified according to test.Certainly, originally
It is understood that alternatively, the second end 12 of outer shaft wall 10 is also possible to permanently closed field technical staff, needs at this time
The liquid in outer shaft wall to be discharged using other measures, such as additional pipe can be inserted and carry out pump suction, or can will be whole
A ground verification dress tilts or tips over, so that liquid can flow out from the first end 11 that outer shaft wall 10 is open.
Generally, down-hole formation simulation main body 20 includes resistivity simulation section 21 and optional borehole wall image checking area
Section 22 and extension of section 23.
Referring to figure 2-3, resistivity simulation section 21 is preferably made of one or more resistivity simulation cell cubes 30, thickness
It can determine as needed.The resistivity simulation cell cube simulates the resistivity on underground different target stratum, for underground survey
Measuring appratus (not shown) measures it.Since resistivity simulation section 21 can be as needed by different-thickness, different resistance
The cell cube of rate forms, therefore the longitudinal resolution of analog device for subsurface measuring can be a variety of not from such as 10mm-1000mm etc.
The different resistivity on stack pile stratum provides the true of science for the calibration of device for subsurface measuring, the establishment of respective explanations software
Real foundation, and reliability and consistency desired result periodically can be carried out to corresponding device for subsurface measuring.
Referring to fig. 4-6, optional borehole wall image checking section 22 is by one or more 35 groups of borehole wall image checking cell cube
At thickness can determine as needed.The borehole wall image checking cell cube simulates the resistivity on underground different target stratum, with
It is measured for device for subsurface measuring (not shown), and at least part or each borehole wall image checking cell cube 35
The inner surface towards 10 central axial line of outer shaft wall on there is at least one locally calibration feature, with for detecting underground survey
One or more characteristic index of instrument.Part calibration feature includes multiple grooves with different geometrical size and/or orientation
37' and/or hole 37''.More specifically, the hole of different-diameter, different depth can be formed on inner hole wall, it is various sizes of
It is parallel to the groove of transverse direction extension, inclined perpendicular to the groove of transverse direction extension and/or relative to transverse direction with other
The inclined groove that rake angle extends, to imaging resolution and/or the investigation depth etc. for for example detecting corresponding device for subsurface measuring
Characteristic index.It is demarcated by now it should be appreciated that borehole wall image checking cell cube 35 is substantially that one kind is special with part
The resistivity simulation cell cube of feature.
As shown in Figure 1, resistivity simulation section 21 can be configured in axial direction adjacent to the first end of outer shaft wall 10
11, and borehole wall image checking section 22 can be configured in axial direction be adjacent to resistivity simulation section 21.Or it is alternative
Ground, borehole wall image checking section 22 can be configured to the in axial direction first end 11 adjacent to outer shaft wall 10, and resistivity mould
Quasi- section 21 can be configured in axial direction be adjacent to borehole wall image checking section 22.
In addition, optional extension of section 23 can also be made of one or more extension of section cell cubes 39, and it is configured to
In axial direction adjacent to the second end 12 of outer shaft wall 10.As skilled in the art will understand, due to underground measuring instrument
Device does not detect extension of section 23, therefore can not particularly limit the resistivity of the section cell cube.
Preferably, energy is defined respectively in resistivity simulation section 21, borehole wall image checking section 22 and extension of section 23
The instrument space 32,36,38 for enough receiving device for subsurface measuring, is illustrated as annular central inner hole in the embodiment in figure 1.Such as preceding institute
It states, extension of section 23 is not measured by device for subsurface measuring, thus instrument space therein 38 is for example used to underground survey
The operation of instrument provides the accommodation space of one section of extension.
It is highly preferred that these instrument spaces 32,36,38 all have identical central axial line, and the cross with same shape
Section, thus these instrument spaces 32,36,38 constitute the down-hole formation simulation complete instrument space 25 of main body 20.
Certainly, it is also understood that, if resistivity simulation section 21, borehole wall image checking section 22
And/or instrument space is not defined in extension of section 23 itself, then device for subsurface measuring will be lowered to the inside of these sections
It is measured in the space limited between surface and outer shaft wall 10.It can thus be stated that received well in ground calibration equipment of the present invention
Lower measuring instrument can simulate main body 20 itself in outer shaft wall 10 by down-hole formation to measure the instrument space of operation
It further limits out, or can also be limited jointly by down-hole formation simulation main body 20 and outer shaft wall 10.
In some embodiments, resistivity simulation cell cube 30, borehole wall image checking cell cube 35 and extension of section unit
Body 39 can be made into any proper shape, such as the brick body of substantially rectangular or substantially fan-shaped ring segment.These brick bodies are outside
It is assembled into each section with being preferably circumferentially laminated end to end or there are certain intervals, in the axial direction in pit shaft, and
Wherein limit corresponding instrument space.
It is highly preferred that resistivity simulation cell cube 30 and/or borehole wall image checking cell cube 35 and/or extension of section unit
Body 39 can be the annular element body with center ring hole, at this time the instrument space of each section by these annular element bodies central rings
Hole is along axial composition.What needs to be explained here is that term " annular " use herein includes but is not limited to circular ring shape, other
Annular with closing or non-close periphery and closing or the hollow inner hole of non-close, for example, the generally oval closing of profile or
The closing or non-close annular etc. that non-close is annular or profile is substantially rectangular are also possible；And it is not required for these rings
The center ring hole of shape and their circumference are of similar shape.Annular element body itself, which can be, to be integrally formed,
It can also be composed of smaller cell cube.
In a preferred embodiment, resistivity simulation cell cube 30, borehole wall image checking cell cube 35 and extension of section
It is circular annular element body that cell cube 39 can be made into center ring hole and circumference as Figure 7-8 in shape
60 form.At this point, resistivity simulation cell cube 30, borehole wall image checking cell cube 35 and extension of section cell cube 39 can all have
There are identical overall diameter and interior diameter, and the thickness of each unit body can be set as needed, it each other can be identical or not
Together.In a specific example, the interior diameter may be, for example, 200 mm, and overall diameter may be, for example, 800 mm(largest outer diameters
It is up to 1.5m or bigger)；Each unit body preferably successively (such as from bottom to top) closed assembly at extension of section 23, borehole wall image checking
Section 22 and resistivity simulation section 21, to constitute entire down-hole formation simulation main body 20；The down-hole formation simulates main body 20
Whole length may be, for example, 7.5 m or so.Annular element body 60 preferably also has the one or more for axially penetrating through itself
Location hole 64.It should be noted that for clarity, location hole 64 only indicates in Fig. 7-8, and in the other drawings not by
It shows.When assembling, by being inserted into positioning pin in the correspondence location hole 64 of adjacent annular cell cube 60, them can be made relative to that
This is appropriately positioned.In one embodiment, the quantity of location hole 64 is preferably three, and along same circumference uniform distribution annular single
On the end face of first body 60.It further, can be in the opposing end surface of two neighboring annular element body 60 when closed assembly annular element body 60
Upper application adhesive and two annular element bodies 60 are adhesively fixed together.In the present invention, described adhesive is preferably silicon
Sour sodium is commonly called as " waterglass ".
Particularly, in the down-hole formation simulation each section of main body 20, especially resistivity simulation section 21 and the borehole wall are imaged
In detector segments 22, each unit body preferably can be certain to simulate by being made of cement, one or more conductive materials and water
The specific electric resistance of formation at target locations.The conductive materials are preferably particle and/or powder type, may be, for example, graphite powder, nanometer
Carbon tube particle, the particle of certain conductive metals or powder, etc..
In a particularly preferred embodiment, the present invention is using graphite powder as conductive materials.Wherein, cement and graphite
The ratio of powder is preferably in the range of 60:40 to 83.5:16.5 according to the size selection to simulated target formation resistivity.
For example, when the ratio of cement and graphite powder is 60:40, the resistivity of manufactured resistivity simulation cell cube substantially 0.2 Ω
M；And when the ratio of cement and graphite powder is 83.5:16.5, the resistivity of manufactured resistivity simulation cell cube is substantially
2000ΩM.As skilled in the art will understand, when manufacturing the cell cube of artifical resistance rate, graphite powder is wherein
It is used as conductive materials, so if ratio shared by graphite powder is reduced, then the resistivity of obtained cell cube will
It increases accordingly；On the contrary, the resistivity of obtained cell cube will accordingly reduce if improving ratio shared by graphite powder.
Accordingly, in carrying out the present invention, the ratio of cement and graphite powder exceeds preferred scope given above according to actual needs is also
It is possible, such as the ratio also permits to select in the ranges such as 50:50 to 90:10.
Herein it should also be noted that the present invention is in manufacture resistivity simulation cell cube (including borehole wall image checking cell cube)
Shi Youxuan will also use sandstone as aggregate unlike manufacture conventional concrete component.This is because if having used sand
Stone causes to be difficult relatively accurately it is expected then the quantity of irregular and/or larger hole in cell cube will be greatly increased
Resistivity；Moreover, the physical characteristic (such as resistivity) of this cell cube with a large amount of irregular and/or larger holes exists
Also it is difficult to keep stablizing in use process.But as this section has revealed that, in an alternative embodiment, sand can also be used
Stone participates in manufacture resistivity simulation cell cube.
Specifically, the method packet of previously described resistivity simulation cell cube (including borehole wall image checking cell cube) is manufactured
Include following steps:
A., the conductive materials (preferably graphite powder) and water of cement, one or more particles and/or powder type are provided.
B. the conductive materials, the cement and the water are stirred, are made into mixture.
C. the mixture is molded, is made into green body.The green body is preferably shaped to have in center
The annular in hole, and specific size then according to specific test it needs to be determined that.
D. the green body after being molded is placed in conformal maintenance a period of time in the base tool of a respective shapes.The section
Time is preferably 24,36,48 or 60 hours or more, more preferably 72 hours or more.
E. drying and processing is carried out to the green body after conformal maintenance.When carrying out the processing, the green body is preferably located in
In the environment of certain temperature more than a period of time, which is preferably 100 DEG C or 120 DEG C or more, more preferably 150 DEG C with
On, and this time is preferably 1,2,3,4,5,6 or 7 hour or more, more preferably 8 hours or more.
The green body after drying and processing may be used as resistivity simulation cell cube.But to making this list
The resistivity of first body keeps relative stability in use, and the influence by ambient humidity to resistivity minimizes, preferably also
It can proceed with following steps:
F. saturation leaching insulation oil processing is carried out to the green body by the drying and processing.
It is necessary to be noted that in the context of this application, term " insulating oil " is not meant to the substance
It is liquid at normal temperature, on the contrary, it is understood to include that can become liquid with electrical insulation characteristics and after the heating
And still remain electrically isolated from those of characteristic megohmite insulant.In the present invention, the insulating oil preferably uses high melting point paraffin, molten
The liquid formed after change can be described as paraffin oil.When carrying out the saturation leaching insulation oil processing, first the high melting point paraffin is heated
It is fused into paraffin oil, then will be completely immersed in the paraffin oil by the green body of the drying and processing.Soaking time is not only wanted
Enable paraffin oil to cover all surface of green body, and paraffin oil is sufficiently submerged in green body, filling is wherein
Hole, with guarantee obtain resistivity simulation cell cube physical property stablize.Specifically, soaking time is preferably 0.5-
Between 2.0 hours, more preferably 1 hour or so.In a specific example, the depth of the paraffin oil can be 1 meter or so,
Certainly this can need to be appropriately arranged with according to impregnating.After having carried out the saturation leaching insulation oil processing, the resistivity of cell cube
Be able to maintain it is relatively stable, to guarantee the checking precision of examined device for subsurface measuring.
It is because the physical property and chemical property of graphite refer to using graphite powder as conducting medium that the present invention, which is particularly preferred,
Be marked on 250 DEG C or less be all it is highly stable, will not react with cement, adhesive etc. and influence cell cube service life and
The stabilization of its resistivity.Other physical and chemical performances stabilizations, evengranular conductive materials, also can be used as conducting medium and cement
Equal other materials are mixed, and resistivity simulation cell cube is made.
So far, although those skilled in the art will appreciate that at large having had shown and described herein multiple exemplary excellent
Embodiment is selected, it still, without departing from the spirit and scope of the present invention, still can be directly true according to present disclosure
Determine or derive many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and assert
To cover all such other variations or modifications.
Claims (4)
1. a kind of method of manufacture for simulating the resistivity simulation cell cube of underground formation at target locations resistivity, it is characterised in that packet
Include following steps:
A. cement, graphite powder and water are provided, wherein the ratio of cement and graphite powder is the range in 60:40 to 83.5:16.5
It is interior according to the size of formation at target locations resistivity selection；
B. the graphite powder, the cement and the water are stirred, are made into mixture；
C. the mixture is molded, is made into green body；
D. the green body after being molded is placed in conformal maintenance a period of time in the base tool of a respective shapes；
E. drying and processing is carried out to the green body after conformal maintenance；
F. saturation leaching insulation oil processing is carried out to the green body by the drying and processing.
2. the method according to claim 1, wherein
The time for carrying out the conformal maintenance is 72 hours or more；
When carrying out the drying and processing, the green body is placed in 150 DEG C of environment 8 hours or more.
3. according to the method described in claim 1, it is characterized by:
The insulating oil is high melting point paraffin；
When carrying out the saturation leaching insulation oil processing, high melting point paraffin heating is first fused into the paraffin oil of liquid, then
It will be completely immersed in the paraffin oil by the green body of the drying and processing.
4. according to the method described in claim 3, it is characterized in that,
By the green body of the drying and processing immerse the time in the paraffin oil be 0.5-2.0 hours between so that the stone
Wax oil can be sufficiently submerged in the green body, fill the intracorporal hole of the base.
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