CN106869913B - A method of water injection well in oil fields waterflood front is detected using well-in-situ potential technology - Google Patents
A method of water injection well in oil fields waterflood front is detected using well-in-situ potential technology Download PDFInfo
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- CN106869913B CN106869913B CN201710124419.1A CN201710124419A CN106869913B CN 106869913 B CN106869913 B CN 106869913B CN 201710124419 A CN201710124419 A CN 201710124419A CN 106869913 B CN106869913 B CN 106869913B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a kind of methods using well-in-situ potential technology detection water injection well in oil fields waterflood front.The method is excited in the bottom and top of water filling layer respectively using powering in current source well, while carrying out current potential observation in earth's surface, and the potential anomalies data observed twice by this carry out inverting to purpose layer resistivity respectively.The resistivity for the surface potential inverting observed when filling the water layer bottom and exciting is the comprehensive response for filling the water layer and filling the water formation resistivity at the top of layer；The resistivity for the surface potential inverting observed when filling the water and exciting at the top of layer is to fill the water the response on stratum at the top of layer.The electrical resistivity results of inverting twice are subtracted each other, so that it may obtain the resistivity of water filling layer.The method through the invention effectively eliminates the electrical information that stratum at the top of layer is filled the water in inversion result, improves the resistivity computational accuracy of water filling layer, more accurate to the explanation of waterflood front.
Description
Technical field
The invention belongs to geophysics and technical field of geological exploration, especially oil explorations and exploitation field, specifically relate to
A kind of and method using well-in-situ potential technology detection water injection well in oil fields waterflood front.
Background technique
In oil-field flooding displacement of reservoir oil development process, water drive direction is accurately determined, identify that the position of waterflood front is surplus to finding
Excess oil and oil field later development is instructed to have a very important role.Well-in-situ potential technology is the one kind developed in recent years and well
The relevant electrical survey (-ing) technology of casing has lateral resolution high compared to traditional electrical log and surface electric survey exploration engineering
The big advantage with investigation depth is to be used to monitor water drive direction at present, identifies the technical way of waterflood front position.The skill
Art is directly powered by casing, and electric current is fed directly into target zone by preforation tunnel, generates anomalous electric field, is laid and is observed in earth's surface
Electrode can receive the potential anomalies signal generated by subsurface anomaly body.Currently, carrying out water drive using the technology in oil field
When leading edge monitors, a potential anomalies data are only observed in earth's surface, water filling layer resistivity is obtained after inverting, so that it is determined that injection water
Involve the position of situation and waterflood front.
This method there are the shortcomings that it is as follows: using casing power, in potential anomalies data of surface observation, surveyed
Current potential the result is that underground flooding interval and its top stratum electrical property information concentrated expression, rather than fill the water layer resistivity information
Response, water filling layer buried depth is deeper, and the influence for filling the water layer upper formation is bigger, and the resistivity precision of inverting is lower, to influence
To the explanation effect on water drive boundary.
Summary of the invention
When for the existing detection water injection well in oil fields waterflood front using well-in-situ potential technology, at the top of by water filling layer
The interference of stratum electrical property information causes the water filling layer resistivity precision obtained according to surface observation current potential inverting lower, thus shadow
Ring to water drive boundary explain effect the problem of, the present invention provide it is a kind of using well-in-situ potential technology detection water injection well in oil fields water drive before
The method of edge.The method by implementing to excite and observe respectively in water filling layer bottom and top, and passing through will inverting knot twice
Fruit is subtracted each other, and eliminates the interference on stratum at the top of water filling layer, the potential property of accurate measurement water filling layer, and then can accurately explain water filling
The water drive boundary of layer.
To realize above-mentioned target, the invention adopts the following technical scheme:
1, basic principle
The electric potential signal of earth's surface is the response generated after current source interacts with subsurface formations, it can reflect the electricity on stratum
Property information.Current source is placed on by well-in-situ potential technology when powering in well, and the electric potential signal of surface observation is to current source and earth's surface
Between stratum electrical property informix response result.In geophysical research, pass through the stratigraphic model to known electrical information
The process of potential response is asked to be known as forward modeling.
Well-in-situ potential technology can use finite difference method and carry out forward modelling potential response, and core concept is will to solve
The rectangular grid cell of domain mesh is replaced continuously solving domain with limited grid cell node.Well-in-situ potential technology is just
The problem of drilling meets the fundamental differential of DC electrical method:
In formula, σ is the conductivity of medium,For current potential, δ is Dirac function, and I is current strength, (x0,y0,z0) it is source
Position, (x, y, z) is the grid cell node coordinate of subdivision.
Carrying out volume point to (1) formula both ends has:
In formula, V represents the volume for surrounding volume element.
From formula (2) as can be seen that potential responseIt is related with the electrical property feature of the position in source and underground medium.Equation right end
Only there is value at the position in source, whenWhen positioned at earth's surface, the volume for surrounding volume element can become with the intensification of electric current source position
Greatly, then surface potential response is the synthesis of all grid cell electrical property information that is, between current source to earth's surface in the volume element
Response.
Formula (2) can be write as to the form of matrix equation according to finite difference method:
In formula, A is coefficient matrix, related with the geometric parameter of the position of current source and subdivision grid；ρ is the resistance on stratum
Rate；It is surface observation current potential.
Inverting is the equal of the inverse process of forward modeling, by the potential data of observation come the anti-electrical property feature for pushing away stratum, on ground
It is known as inverting in ball physics.Then according to the expression formula of formula (3) available Solving The Resistivities of The Earth are as follows:
By analysis above it is found that ρ reflection be the stratum between current source to earth's surface electrical information.
2, technical solution
When well-in-situ potential technology is powered by casing, electric current is transmitted to water filling interval along casing, it is believed that water filling layer
The position of section is the position in source, and is fixed and invariable, and the current potential of surface observation is water filling interval and its top stratum at this time
The comprehensive response of electrical property feature, the resistivity that inverting obtains also can not accurately reflect the electrical information of water filling layer.
In order to more accurately explain the waterflooding effect of water filling layer, the present invention is based on the basic principles of well-in-situ potential technology, mention
A kind of method using well-in-situ potential technology detection water injection well in oil fields waterflood front is gone out.The method utilizes to be supplied in current source well
Electricity is excited in the bottom and top of water filling layer respectively, while carrying out current potential observation, the electricity observed twice by this in earth's surface
Position abnormal data carries out inverting to purpose layer resistivity respectively.The electricity for the surface potential inverting observed when filling the water layer bottom and exciting
Resistance rate is the comprehensive response for filling the water layer and filling the water formation resistivity at the top of layer；The surface potential observed when filling the water and being excited at the top of layer
The resistivity of inverting is to fill the water the response on stratum at the top of layer.The electrical resistivity results of inverting twice are subtracted each other, so that it may be filled the water
The resistivity of layer.
Using well-in-situ potential technology detection water injection well in oil fields waterflood front method the following steps are included:
1) measure preparation: be ready to excitation power source underground positioning and measuring electrode earth's surface laying；
2) excitation for the first time and measurement: being positioned at water filling layer bottom for excitation power source, implements excitation, while measuring in earth's surface
Electrical potential information；
3) first time inverting: using resulting electrical potential information is measured for the first time, inverting obtains water filling layer and its top stratum
Resistivity；
4) second of excitation and measurement: excitation power source is positioned at the top of water filling layer, implements excitation, while measuring in earth's surface
Electrical potential information；
5) second of inverting: using resulting electrical potential information is measured for the second time, inverting obtains the electricity on stratum at the top of water filling layer
Resistance rate；
6) it calculates the resistivity of water filling layer: subtracting the resulting resistance of second of inverting with the resulting resistivity of first time inverting
Rate, so that it may obtain the resistivity of water filling layer.
The advantages and benefits of the present invention are: the technical solution, which effectively eliminates, fills the water ground at the top of layer in inversion result
The electrical information of layer improves the resistivity computational accuracy of water filling layer, more accurate to the explanation of waterflood front.
Detailed description of the invention
Attached drawing 1 is that the method for the present invention using well-in-situ potential technology detection water injection well in oil fields waterflood front is illustrated
Figure.
In figure, 1 is first time excitaton source position, and 2 be second of excitaton source position, and 3 be to fill the water layer bottom, 4
It is at the top of water filling layer, 5 be waterflood front, and 6 be well pipe sleeve, and 7 be observation electrode.
Attached drawing 2 is the workflow of the method for the present invention using well-in-situ potential technology detection water injection well in oil fields waterflood front
Cheng Tu.
Attached drawing 3 is the stratigraphic model figure of embodiment of the present invention.
In figure, 6 be well pipe sleeve, and 8 be water filling layer.
Attached drawing 4 is the first time inversion result figure of embodiment of the present invention.
Attached drawing 5 is second of inversion result figure of embodiment of the present invention.
Attached drawing 6 is the water filling layer inversion result figure of embodiment of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Referring to attached drawing 1, a method of utilize well-in-situ potential technology to detect water injection well in oil fields waterflood front.The method benefit
It is powered in current source well, is excited, while carrying out current potential observation in earth's surface, passed through in the bottom and top of water filling layer respectively
This potential anomalies data observed twice carries out inverting to purpose layer resistivity respectively.By the electrical resistivity results phase of inverting twice
Subtract, so that it may obtain the resistivity of water filling layer.
Referring to attached drawing 2, using well-in-situ potential technology detection water injection well in oil fields waterflood front method the following steps are included:
1) measure preparation: be ready to excitation power source underground positioning and measuring electrode earth's surface laying；
2) excitation for the first time and measurement: being positioned at water filling layer bottom for excitation power source, implements excitation, while measuring in earth's surface
Electrical potential information；
3) first time inverting: using resulting electrical potential information is measured for the first time, inverting obtains water filling layer and its top stratum
Resistivity；
4) second of excitation and measurement: excitation power source is positioned at the top of water filling layer, implements excitation, while measuring in earth's surface
Electrical potential information；
5) second of inverting: using resulting electrical potential information is measured for the second time, inverting obtains the electricity on stratum at the top of water filling layer
Resistance rate；
6) it calculates the resistivity of water filling layer: subtracting the resulting resistance of second of inverting with the resulting resistivity of first time inverting
Rate, so that it may obtain the resistivity of water filling layer.
Embodiment
It is illustrated below by the inverting the trial result to theoretical stratigraphic model of the present invention using well-in-situ potential
Technology detects effect of the method for water injection well in oil fields waterflood front in terms of improving waterflood front Explanation Accuracy.
If well depth 1000m, layer buried depth 400m is filled the water, fills the water thickness 100m, injection water resistance rate is 10 Ω m, fills the water layer
Specification be 600m × 200m × 100m, upper formation resistivity is 100 Ω m, and specific stratigraphic model is as shown in Fig. 3.
Formation resistivity is as shown in Fig. 4 at the top of the current source water filling layer that inverting obtains when filling the water excitation at the top of layer, electricity
Stream source water filling layer and its top formation resistivity that when filling the water layer bottom and exciting, inverting is obtained are as shown in Fig. 5.Comparison discovery,
The result of inverting twice is variant, but difference degree is unobvious.It is that the resistivity of this inverting twice obtains after subtracting each other as a result, i.e.
The resistivity for filling the water layer is as shown in Fig. 6, it can be seen that the image that the method is handled through the invention compares single observation
The explanation results that method obtains are closer to known models.This method effectively eliminates the electrical information on stratum at the top of water filling layer,
The position for accurately having identified note water boundary, improves the Explanation Accuracy of waterflood front.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations of stretching are still in the protection scope of this invention.
Claims (2)
1. a kind of method using well-in-situ potential technology detection water injection well in oil fields waterflood front, it is characterised in that: the method benefit
It is powered in current source well, is excited, while carrying out current potential observation in earth's surface, passed through in the bottom and top of water filling layer respectively
This potential anomalies data observed twice carries out inverting to purpose layer resistivity respectively；It will be observed simultaneously in the bottom excitation of water filling layer
The electrical resistivity results that inverting obtains subtract the electrical resistivity results for exciting observation and inverting to obtain at the top of water filling layer, so that it may
To the resistivity of water filling layer.
2. a kind of method using well-in-situ potential technology detection water injection well in oil fields waterflood front according to claim 1, should
Method the following steps are included:
1) measure preparation: be ready to excitation power source underground positioning and measuring electrode earth's surface laying；
2) excitation for the first time and measurement: being positioned at water filling layer bottom for excitation power source, implements excitation, while measuring current potential in earth's surface
Information；
3) first time inverting: using resulting electrical potential information is measured for the first time, inverting obtains the electricity on water filling layer and its top stratum
Resistance rate；
4) second of excitation and measurement: excitation power source is positioned at the top of water filling layer, implements excitation, while measuring current potential in earth's surface
Information；
5) second of inverting: using resulting electrical potential information is measured for the second time, inverting obtains the resistivity on stratum at the top of water filling layer；
6) it calculates the resistivity of water filling layer: subtracting the resulting resistivity of second of inverting with the resulting resistivity of first time inverting,
It can be obtained by the resistivity of water filling layer.
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| CN108387444B (en) * | 2018-04-02 | 2020-06-30 | 东方华隆（北京）石油技术有限公司 | Cased well fracturing continuous monitoring control method based on well-to-ground potential imaging |
| CN110017136B (en) * | 2019-03-14 | 2023-01-10 | 中国石油天然气集团有限公司 | Water flooded layer identification and water production rate prediction method based on apparent water layer resistivity |
| CN112983401B (en) * | 2021-04-30 | 2021-07-30 | 西南石油大学 | Boundary determination method for water invasion of boundary water gas reservoir |
| CN117153289B (en) * | 2023-09-14 | 2024-04-05 | 大庆油田有限责任公司 | Reservoir flooding degree prediction method suitable for narrow and thin sand bodies |
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