CN101609170B - Simulation well device for three-dimensional induction logging experiments - Google Patents

Simulation well device for three-dimensional induction logging experiments Download PDF

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CN101609170B
CN101609170B CN2009100889471A CN200910088947A CN101609170B CN 101609170 B CN101609170 B CN 101609170B CN 2009100889471 A CN2009100889471 A CN 2009100889471A CN 200910088947 A CN200910088947 A CN 200910088947A CN 101609170 B CN101609170 B CN 101609170B
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solution
layer
well
stratum
solution tank
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CN101609170A (en
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罗曦
孙向阳
李爱勇
马明学
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China Oilfield Services Ltd
China National Offshore Oil Corp CNOOC
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China Oilfield Services Ltd
China National Offshore Oil Corp CNOOC
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Abstract

The invention provides a simulation well device for three-dimensional induction logging experiments, which comprises a solution tank, a solution layer, a well bore and a filling layer, wherein, the solution tank is arranged under stratum, the solution layer is solution with certain conductivity, the solution layer is filled in the solution tank for simulating an underground environment, the well bore is arranged in the solution layer for placing an instrument for carrying out well logging, the filling layer is arranged between the solution tank and the stratum for reducing the impacts of the stratum on the simulation environment in the solution tank, and liquid with certain conductivity is filled in the filling layer. The simulation well device adopts the filling layer for shielding interferences of the stratum to the well logging by the instrument, thereby not only improving the accuracy of instrument well logging tests, but also greatly reducing the radial depth of the solution tank, reducing volume of the solution layer and further reducing the manufacturing cost of the simulation well.

Description

A kind of simulation well device that is used for the three-dimensional induction logging experiment
Technical field
The present invention relates to a kind of simulation well device that is used for the three-dimensional induction logging experiment.
Background technology
At present, a kind of instrument of novel well logging is before coming into operation, and big city is through the development of theoretical research, Research on experimental methods and model machine, at last just to large batch of production and this flow process that comes into operation.Research on experimental methods is very crucial, both can be used to the correctness of proof theory, the feasibility of scheme, also can provide guidance to some parameter designing of instrument according to experimental result, also can provide reliable quality detecting method simultaneously after the instrument industry.
Now, the test pit of induction instrument aratus mostly is built on the ground both at home and abroad, and as shown in Figure 1, NaOH solution tank NaOH 8 is built on the ground, and well 4 is arranged in NaOH solution tank NaOH 8, and the instrument 5 of well logging carries out well logging work in well 4.The data that this structure records are comparatively accurate, and this is owing to the extraneous air that is that directly makes progress at test pit, so the instrument 5 of well logging is not influenced by radially extraneous electrical environment when logging well, is convenient to the accurate assessment of measurement data.But also there is wretched insufficiency in this design proposal: the laboratory floor height is higher, causes cost of manufacture very high; In addition, outer water pot need bear great solution pressure owing to directly build in the atmosphere, and solution is destroyed, and has very big dangerous hidden danger; At last, have work high above the ground during owing to test, processing safety is relatively poor.
Also having a kind of scheme is as experiment well, as shown in Figure 2 at the underground big NaOH solution tank NaOH of building.It can regard two-layer model as diametrically, actual formation 3 outside solution layer 1 and the NaOH solution tank NaOH 8, because conductivity the unknown of the outer actual formation 3 of well, and may be heterogeneity, the outer conductivity of well may change (its humidity increases as raining later, and conductivity also may increase) simultaneously.In order to bring into play the effect of experiment well, can the response of evaluation appts 5 under a model of determining whether consistent with theoretical discreet value, known deterministic models need be provided, also promptly need reduce NaOH solution tank NaOH 8 influence on uncertain stratum 3 outward as far as possible.We investigate the influence that 3 pairs of instruments of actual formation 5 respond by the numerical simulation program, and when investigation NaOH solution tank NaOH 8 radius r were much, external influence was enough little.The conductivity hypothesis variation range on the stratum 3 of the extraneous reality of well is 0.01-0.1S/m, and the conductivity in the NaOH solution tank NaOH 8 are about 0.5S/m, and the distance that is transmitted into receiving coil is got 39in.When different conductivity was got on stratum 3, response change is very little thought that then external influence is less, investigated the radially radius r situation of change of the variation error of response with NaOH solution tank NaOH 8.The variation error error of response is defined as: error=[f (δ out=0.1)-f (δ out=0.01)]/f (δ out=0.1), the response when wherein f (δ out=0.1) expression actual formation 3 conductivity are 0.1S/m; Response when f (δ out=0.01) expression actual formation 3 conductivity are 0.01S/m.Error e rror with the variation relation of NaOH solution tank NaOH 8 radius r as shown in Figure 3, among the figure zz curve refer to z to coil emission, the response error that z receives to coil (be the coaxial coil emission, coaxial coil receives), among the figure xx curve refer to x to coil emission, the response error (coplane coil emission, the coplane coil receives) that x receives to coil.
As can be seen from Figure 3: be unlikely to make the variation error of the response of emulation and measurement to surpass 5% for the influence that makes stratum 3, then need instant flow container 8 radiuses of radial depth to be not less than 3.7m, if transmitter-receiver spacing increases or the conductivity of solution reduces all may cause required NaOH solution tank NaOH 8 radiuses to increase.Obviously it is so big to build a radius, and it is very large highly generally needing the above NaOH solution tank NaOH 8 required costs of 6m, and also needs often to change solution in experimentation, or the conductivity of change solution, NaOH solution tank NaOH 8 radiuses are crossed conference and are caused experimental cost to increase, and increase experimental period, and efficient reduces.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of with low cost, safe, and the test pit of the reliable induction instrument aratus of data.
In order to address the above problem, the invention provides a kind of simulation well device that is used for the three-dimensional induction logging experiment, comprising: NaOH solution tank NaOH, solution layer, well and packed layer; Wherein,
Described NaOH solution tank NaOH is arranged under the stratum;
Described solution layer is the solution with certain conductivity, and this solution layer is filled in the described NaOH solution tank NaOH, is used to simulate subsurface environment;
Described well is arranged in the described solution layer, is used to place the instrument of logging well;
Described packed layer is arranged between described NaOH solution tank NaOH and the stratum, is used to reduce the influence of described stratum to simulated environment in the described NaOH solution tank NaOH, and described packed layer is interior to be filled with the liquid with certain conductivity.
Further, described liquid is that conductivity is the salt solusion of 0.02-0.1S/m.
Further, also be provided with water barrier between described packed layer and the stratum.
Further, the tube wall of described well is the fiberglass with certain conductivity.
Further, described solution layer is a salt solusion.
The present invention has following advantage:
1, the present invention adopts the interference of packed layer shielding stratum to the instrument well logging, not only can improve the accuracy of instrument well logging test, can also reduce the radius of NaOH solution tank NaOH greatly, reduces the solution layer volume, thereby reduces the cost of manufacture of simulation well.
2, the water barrier among the present invention can be so that the present invention's reliability in the process of the test of logging well be improved.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the present invention are described further:
Fig. 1 shows the test pit model that is built in the face of land;
Fig. 2 shows tradition and is built in underground test pit model;
Fig. 3 shows that the error that influences on stratum concerns synoptic diagram with the NaOH solution tank NaOH change in radius in the test pit shown in Figure 2;
Fig. 4 shows a kind of simulation well apparatus structure synoptic diagram that is used for the three-dimensional induction logging experiment of the present invention;
Fig. 5 shows anisotropic band structural representation among the present invention;
Fig. 6 shows the simplified model synoptic diagram when being not counted in well and anisotropic band among the present invention;
Fig. 7 show packed layer conductivity among the present invention be 0.02 o'clock stratum influence error and the packed layer change in radius concerns synoptic diagram;
Fig. 8 show packed layer conductivity among the present invention be 0.1 o'clock stratum influence error and the packed layer change in radius concerns synoptic diagram;
Fig. 9 shows second kind of example structure synoptic diagram of the present invention;
Figure 10 shows the third example structure synoptic diagram of the present invention.
Embodiment
As shown in Figure 4, the present invention includes: NaOH solution tank NaOH 8, solution layer 1, well 4 and packed layer 2; Wherein,
NaOH solution tank NaOH 8 is arranged on the stratum 3 times;
The solution of solution layer 1 for having certain conductivity, this solution layer 1 is filled in the NaOH solution tank NaOH 8, is used to simulate subsurface environment;
Well 4 is arranged in the solution layer 1, is used to place the instrument 5 of logging well;
Packed layer 2 is arranged between NaOH solution tank NaOH 8 and the stratum 3, is used to reduce the influence of simulated environment in 3 pairs of NaOH solution tank NaOHs in stratum 8, is filled with the liquid with certain conductivity in the packed layer interior 2.
For when reducing stratum 3 pairs of simulated environments influence as far as possible, reduce the radius of NaOH solution tank NaOH 8 as far as possible, to reduce cost, raise the efficiency and reduce the test period, the present invention has designed packed layer 2.Fill liquid in the packed layer 2 with certain conductivity.Filling material in the packed layer 2 need not be changed when the present invention carries out different simulation tests, can use for a long time.The solution that only needs to change in the NaOH solution tank NaOH 8 gets final product.
The liquid of filling in the packed layer 2 can be salt solusion, and conductivity can be taken as 0.02-0.1S/m.Because the liquid of filling in the packed layer 2 can use for a long time,, thereby can improve the accuracy that the present invention simulates so that packed layer can be built is bigger.
Also be provided with water barrier 7 between packed layer 2 and the stratum 3.Water barrier 7 effectively separates packed layer 2 and stratum 3, prevents that the moisture content on stratum 3 from entering packed layer 2, thereby avoids changing the conductivity of packed layer 2.The material of water barrier 7 can be selected according to actual needs, can select plastics, rubber and other waterproof forms.
In NaOH solution tank NaOH 8, also be provided with in order to realize the anisotropic band 6 of macroscopic anisotropy.Anisotropic band 6 structures comprise plastic plate 61, salt solusion 62 and the plastic support 63 of even punching as shown in Figure 5.
Anisotropic band 6 is alternately placed to realize macroscopic anisotropy with salt solusion 62 by the plastic plate 61 of evenly punching.Can change whole conductivity by the conductivity that changes salt solusion 62, the factor of porosity of the plastic plate 61 by changing even punching changes coefficient of anisotropy.Plastic plate 61 supports by plastic support 63 each other.The factor of porosity of plastic plate 61 is controlled by the size and the density in hole, thus the control coefficient of anisotropy.This control coefficient of anisotropy is realized comparatively simple, and cost is lower, specifically can be referring to the patent of having applied for (application number: 200810222501.9).
The fiberglass of tube wall 9 for having certain conductivity of well 4.The desirable 0.05S/m of conductivity, this structure can be simulated actual well effectively, and especially for the coplane coil, the tube wall 9 of well 4 has certain conductivity and is very important.According to the actual needs of the instrument 5 of logging well, can fill liquid in the well with certain conductivity.
Solution layer 1 is a salt solusion.The conductivity of salt solusion can change according to instrument 5 differences of every kind of well logging.The solution of filling in the packed layer 2 also is salt solusion, its objective is in order to offset the influence of the 3 pairs of solution layers 1 in stratum.After packed layer 2 salt solusions were offset stratum 3 influences, solution layer 1 salt solusion can play a role to greatest extent, for logging instrumentation 5 provides test data.Because packed layer 2 has been offset the major part influence on stratum 3, the salt solusion of solution layer 1 can be seldom, and just the radius of NaOH solution tank NaOH 8 can be less, and different logging instrumentations 5 are being tested, and is also very convenient and economical when needing to change solution layer 1 salt solusion.
Because the conductivity on stratum 3 has very strong uncertainty, and the radius of packed layer 2 is limited all the time, so stratum 3 a pair of meetings exert an influence to response.At experiment well shown in Figure 4, when we investigate packed layer 2 radiuses radially and are higher than which type of numerical value by emulation the variation of stratum 3 conductivity just little of negligible degree to the response influence of instrument 5, just can regard deterministic models as.When not considering well 4 and anisotropic band 6, simulation well device shown in Figure 4 can equivalence becomes that the footpath makes progress is divided into three layers model, and as shown in Figure 6, ground floor is a solution layer 1, and the second layer is that 2, the three layers of packed layers be the stratum 3 of reality.
Make the conductivity δ of solution layer 1 1=0.1S/m, the radius of NaOH solution tank NaOH 8 are r 1=2.0m, the conductivity δ of packed layer 2 2=0.02S/m, the external radius of packed layer 2 is r 2Investigate the 3rd layer of actual formation 3 conductivity from δ 3During=0.05-0.02S/m, the relative variation of response is with r 2Relation.And to define this relative variation be error e rror, that is:
Error＝[f(δ 3＝0.05)-f(δ 3＝0.02)]/f(δ 3＝0.02)
F (δ in the following formula 3=0.05) gets δ for stratum 3 3Response during=0.05S/m, f (δ 3=0.02) gets δ for stratum 3 3=0.02 o'clock response.With the conductivity on stratum 3 is 0.02 as benchmark, because the conductivity on stratum 3 is uncertain, and the error when different conductivity is got on stratum 3 when getting 0.02.The result of emulation as shown in Figure 7, as can be seen from Figure 7 when the radius of packed layer 2 during greater than 6.5m the influence on stratum 3 very little, error is less than 5%.
Conductivity δ when packed layer 2 2During=0.1S/m, other parameter constants, error is with r 2Variation relation as shown in Figure 8, as can be seen from Figure 8 when the radius r of packed layer 2 2The influence on stratum 3 is very little during greater than 5.3m, and error is less than 5%.Obviously packed layer 2 conductivity are big more, and the decay of the field that drive coil is produced is big more, and just the influence on stratum 3 is more little.
Among Fig. 7, Fig. 8, the zz curve refer to z to coil emission, the response error that z receives to coil (be the coaxial coil emission, coaxial coil receives), among the figure xx curve refer to x to coil emission, the response error (coplane coil emission, the coplane coil receives) that x receives to coil.
But packed layer 2 conductivity can not be got excessive, because packed layer 2 conductivity are big more, the contribution to the coil response of solution layer 1 is just more little, and just packed layer 2 replaces the instrument 5 work effects that well logging is disturbed on stratum 3, destroys the influence of the instrument 5 of 1 pair of well logging of solution layer.In general, packed layer 2 conductivity get between 0.02～0.1S/m comparatively suitable.
By to experimental study of the present invention, known deterministic models are provided can for our well logging experiment, be convenient to our experimental result and theoretical simulation result's contrast, thereby help our Performance Evaluation instrument 5.
It is to be close to water barrier 7 that solution in Fig. 4 is irritated 8 bottoms, same principle, we also can irritate between 8 bottoms and the actual formation 3 at solution and add one deck packed layer 2, thereby help reducing the influence that solution is irritated the 3 pairs of instruments in stratum, 5 responses of 8 bottoms, and version as shown in Figure 9.
The well 4 of instrument is also extending to water barrier 7 places in addition, structure as shown in figure 10, it is bigger to be convenient to the scope that instrument 5 moves up and down like this.
In sum, the present invention can effectively reduce the size of solution filling 8, can save construction cost effectively and improve the efficient of experiment.And can make the influence of the 3 pairs of instruments in stratum, 5 responses enough little, testing for the instrument 5 of multiple-component induction logging provides known deterministic models.
In sum; being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention, therefore; all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. a simulation well device that is used for the three-dimensional induction logging experiment is characterized in that, comprising: NaOH solution tank NaOH (8), solution layer (1), well (4) and packed layer (2); Wherein,
Described NaOH solution tank NaOH (8) is arranged under the stratum (3);
The solution of described solution layer (1) for having certain conductivity, this solution layer (1) is filled in the described NaOH solution tank NaOH (8), is used to simulate subsurface environment;
Described well (4) is arranged in the described solution layer (1), is used to place the instrument (5) of logging well;
Described packed layer (2) is arranged between described NaOH solution tank NaOH (8) and stratum (3), be used to reduce the influence of described stratum (3) to the interior simulated environment of described NaOH solution tank NaOH (8), described packed layer is filled with the liquid with certain conductivity in (2), also is provided with water barrier (7) between described packed layer (2) and stratum (3).
2. the simulation well device that is used for the three-dimensional induction logging experiment as claimed in claim 1, it is characterized in that: described liquid is that conductivity is the salt solusion of 0.02-0.1S/m.
3. the simulation well device that is used for the three-dimensional induction logging experiment as claimed in claim 1 is characterized in that: the fiberglass of the tube wall (9) of described well (4) for having certain conductivity.
4. the simulation well device that is used for the three-dimensional induction logging experiment as claimed in claim 1, it is characterized in that: described solution layer (1) is a salt solusion.
CN2009100889471A 2009-07-14 2009-07-14 Simulation well device for three-dimensional induction logging experiments Active CN101609170B (en)

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CN102966345B (en) * 2012-12-05 2015-08-05 中国海洋石油总公司 A kind of simulation well system for testing electromagnetic wave resistivity logging instrument
CN107229083B (en) * 2016-03-25 2019-05-07 中国石油化工股份有限公司 A kind of crack induction logging response simulator
CN109901230B (en) * 2019-04-02 2020-08-11 中国科学院地质与地球物理研究所 Equipment for temperature correction and deep stratum environment simulation of induction logging instrument

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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing

Co-patentee after: China Oilfield Services Limited

Patentee after: China Offshore Oil Group Co., Ltd.

Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing

Co-patentee before: China Oilfield Services Limited

Patentee before: China National Offshore Oil Corporation