CN114059998B - Device and method for simulating blockage of chemical flooding injection well and production well - Google Patents
Device and method for simulating blockage of chemical flooding injection well and production well Download PDFInfo
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- CN114059998B CN114059998B CN202111146794.9A CN202111146794A CN114059998B CN 114059998 B CN114059998 B CN 114059998B CN 202111146794 A CN202111146794 A CN 202111146794A CN 114059998 B CN114059998 B CN 114059998B
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- pipe column
- production well
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- simulation pipe
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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
- E21B47/00—Survey of boreholes or wells
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention discloses a chemical flooding injection well and production well blockage simulation device and method, wherein the device comprises a model box, an injection well simulation pipe column, a production well simulation pipe column, a blockage production well simulation pipe column, a saturation electrode pair and a pressure sensor; the invention can carry out physical simulation experiments on common heavy oil reservoirs with different blocking positions or sizes of the injection well and the production well in the chemical flooding process, simulate the blocking positions, blocking sizes and other characteristics of the injection well and the production well in different development stages of the chemical flooding, observe the oil-water migration state through the model, study the blocking mechanism of the injection well and the production well, and the influence of blocking on the oil-water seepage and the production liquid characteristics, and simultaneously predict the effect of blocking removal measures.
Description
Technical Field
The invention belongs to the field of petroleum industry, and particularly relates to a device and a method for simulating blockage of a chemical flooding injection well and a production well.
Background
In order to realize the physical simulation of the development characteristic rule in the chemical flooding process, the method has been applied in the petroleum industry. At present, the physical models for researching chemical flooding mechanisms are more at home and abroad, but the existing model design has a gap for simulating the injection and production characteristics of chemical flooding oil fields in stages, particularly the phenomenon of abnormal descending of produced liquid in offshore oil field chemical flooding fields; the existing model experiment lacks a better method in model design for researching the phenomenon of liquid production decline caused by chemical flooding blockage and the influence of different blockage positions and blockage sizes on the oil displacement effect. From the experience and practice of the industry, an indoor physical simulation model with the functions of on-line monitoring of saturation and pressure for researching the blocking mechanism of a chemical flooding injection well and a production well is provided, so that the defects of the prior art are overcome.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for simulating blockage of a chemical flooding injection well and a production well. According to the model, the oil-water migration state can be observed, the blocking mechanism of an injection well and a production well and the influence of blocking on oil-water seepage and liquid production characteristics are researched, and meanwhile, the effect prediction of blocking removal measures is carried out.
The invention is realized by the following technical scheme:
a chemical flooding injection well and production well blockage simulation device comprises a model box, an injection well simulation pipe column, a production well simulation pipe column, a blockage production well simulation pipe column, a saturation electrode pair and a pressure sensor;
the model box is of a closed square box body structure, quartz sand is filled in the model box, the inner space of the model box is divided into an original pore infiltration area and a blocking area according to the number of the filled quartz sand, and the number of the quartz sand in the blocking area is larger than that of the quartz sand in the original pore infiltration area;
the injection well simulation pipe column is inserted into the original hole seepage area from the side wall of the model box, the production well simulation pipe column is also inserted into the original hole seepage area from the side wall of the model box, and the blocking production well simulation pipe column is inserted into the blocking area from the side wall of the model box;
and a saturation electrode pair and a pressure sensor are arranged in quartz sand filled in the model box.
In the above technical solution, the size of the mold box is 30cm×30cm×4.5cm.
In the technical scheme, the quartz sand in the original pore infiltration area is 60-80 meshes, and the quartz sand in the blocking area is 100-120 meshes.
In the technical scheme, valves are arranged on the injection well simulation pipe column, the production well simulation pipe column and the plugged production well simulation pipe column.
In the technical scheme, the injection well simulation tubular column, the production well simulation tubular column and the plugged production well simulation tubular column are formed by cutting seams of stainless steel pipelines, and the outer parts of the injection well simulation tubular column, the production well simulation tubular column and the plugged production well simulation tubular column are formed by encircling stainless steel nets.
In the above technical solution, the production well simulation string includes a first production well simulation string, a second production well simulation string, and a third production well simulation string, which are inserted from a side wall of a model box different from the injection well simulation string, respectively.
In the above technical solution, the pair of saturation electrodes are arranged in a matrix at intervals.
In the above technical solution, the pressure sensor is arranged at a distance from the saturation electrode.
A method for simulating blockage of a chemical flooding injection well and a production well comprises the following steps:
step one, determining an original hole infiltration area and a blocking area in a model box according to a design scheme and a blocking actual condition, arranging a saturation electrode and a pressure sensor along the whole model in advance, and filling quartz sand with different meshes into the original hole infiltration area and the blocking area respectively;
setting an injection well simulation pipe column and a production well simulation pipe column which are communicated with the original pore infiltration zone, setting a blocking production well simulation pipe column which is communicated with the blocking zone, and installing a valve at each inlet and outlet;
step three, dry weight is weighed, saturated water is vacuumized, wet weight is weighed again, saturated oil is carried out according to the actual displacement mode of oil flooding, the original pore volume and the saturated oil volume are recorded, and the porosity and the saturation are calculated;
and fourthly, according to the design scheme, water is designed from constant-speed water flooding to scheme, chemical flooding test is carried out by converting constant pressure into constant pressure, well opening/closing conversion of a production well and a blocked well is carried out according to the design scheme, blocking generation and release in the chemical flooding process are simulated, conditions of injection pressure, liquid production and the like are observed, recording and metering are carried out, and the liquid production and development effects of different blocking effects of chemical flooding are evaluated.
The invention has the advantages and beneficial effects that:
the invention discloses a device and a method for simulating blocking of a chemical flooding injection well and a production well, which can be used for carrying out physical simulation experiments on common heavy oil reservoirs with different blocking positions or sizes of the injection well and the production well in the chemical flooding process, simulating the blocking positions, blocking sizes and other characteristics of the injection well and the production well in different development stages of the chemical flooding, observing the migration state of oil and water through the model, researching the blocking mechanism of the injection well and the production well and the influence of blocking on the characteristics of oil and water seepage and production liquid, and simultaneously carrying out effect prediction of blocking removal measures.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Wherein: 1 is an injection well simulation pipe column, 2 is a first production well simulation pipe column, 3 is a second production well simulation pipe column, 4 is a third production well simulation pipe column, 5 is a plugged production well simulation pipe column, 6 is a plugged region, 7 is an original pore permeation region, 8 is a saturation electrode pair, and 9 is a pressure sensor.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the person skilled in the art better understand the solution of the present invention, the following describes the solution of the present invention with reference to specific embodiments.
Example 1
A chemical flooding injection well and production well blocking simulation device is composed of a cube, quartz sand is filled in the cube, an injection well simulation pipe column 1, a plurality of production well heads (comprising a first production well simulation pipe column 2, a second production well simulation pipe column 3, a third production well simulation pipe column 4 and a blocking production well simulation pipe column 5) are arranged, and a saturation electrode 8 and a pressure sensor 9 are arranged in the horizontal direction.
The model body can adopt a sand filling model or an artificial cementing model to complete an original pore infiltration area 7, and the filler is quartz sand with a certain mesh number.
The size of the model body is 30cm x 4.5cm, and a sand filling model and an artificial cementing model can be adopted to finish the original pore infiltration area 7, wherein the filler is quartz sand with the mesh number of 60-80 meshes. The model body can be provided with a blocking area 6 with 5cm near the wellhead at different blocking positions, the blocking degree can determine the permeability after blocking according to the injection/liquid production capacity, and the blocking area is 5cm x 5cm, and the filler is a certain number of quartz sand required for reducing the permeability, and is generally selected to be more than 100-120 meshes according to the blocking degree. The blocking area 6 and the original pore infiltration area 7 are not required to be completely isolated, and quartz sand with different mesh numbers directly forms infiltration interfaces.
The injection well and the production well are simulated by adopting stainless steel pipeline slotting, the outside is formed by encircling a stainless steel net, different well completion modes are simulated, and the blockage of the filler can be avoided;
the injection well simulation pipe column 1, the first production well simulation pipe column 2, the second production well simulation pipe column 3, the third production well simulation pipe column 4 and the blocking production well simulation pipe column 5 can simulate experimental schemes capable of designing different blocking opportunities, liquid production characteristics and blocking removal effects.
According to the requirement of a research scheme on the flat model, the saturation electrode 8 and the pressure sensor 9 are arranged, so that the on-line monitoring of the oil saturation and the pressure can be realized. The saturation sensor adopts an Alqi formula between saturation and resistivity for testing, and the electrode pair is required to be kept vertical in the sand filling process; the arrangement mode is that the well head positions are removed, the well head positions are arranged at equal intervals according to 6*6, and the inside of the model is preset before sand filling or cementing and is within 0.5cm from the lower boundary. The pressure sensor is arranged at intervals with the saturation sensor according to the requirement, and is not suitable for being too much.
The wellhead positions are arranged according to the actual well groups, and the wellhead positions comprise various well pattern forms such as a vertical well, a horizontal well, one injection and three production; on the plane, the wellhead is arranged inside the model within 0.5cm from the boundary; in the longitudinal direction, the vertical well is arranged inside the model within 0.5cm from the upper and lower boundaries, and the horizontal well is arranged at the thickness center of the model. In the implementation process, different blocking moments are set by closing the production well 4 and blocking the opening of the production well 5, blocking removal effects are set by closing the production well 5 and opening the production well 4, and the changes of the liquid production, the oil production, the water production, the pressure and the like in the experimental process are recorded, so that the changes of the characteristics of the liquid production are studied.
Example 2
The method for using the chemical flooding injection well and production well blockage simulating device described in the above embodiment 1, namely, the specific implementation process of the chemical flooding injection well and production well blockage simulating method is as follows:
1. and (3) model making: the sand filling model or the artificial cementing flat plate model is purchased and prepared according to the design scheme and the actual condition of blockage and the model description. Firstly, selecting 60-80 mesh quartz sand, arranging an original pore infiltration area 7 and 100-120 mesh quartz sand, arranging a blocking area 6, and arranging 6*6 saturation electrodes 8 and pressure sensors 9 along the whole model in advance.
2. The model simulates a one-injection three-production well pattern of a 1/4 reverse nine-point well group, an injection well simulation pipe column 1, a first production well simulation pipe column 2, a second production well simulation pipe column 3 and a third production well simulation pipe column 4 are arranged in an original hole seepage area, three production wells are simulated, and a plugged production well simulation pipe column 5 is arranged in a plugged area 6 to simulate a production process to plug a well.
3. After the model is prepared, installing valves at each inlet and outlet, weighing dry weight, vacuumizing saturated water, weighing wet weight again, saturating oil according to the actual displacement mode of oil flooding of the oil reservoir, recording the original pore volume and saturated oil volume, and calculating the porosity and saturation.
4. According to the design scheme, the constant-speed water flooding is carried out until the water content is 85% in the scheme design, the constant pressure is changed to 0.4MPa, the chemical flooding test is carried out, the well opening/closing switching of the production well and the blocked well is carried out according to the design scheme, the blocking in the chemical flooding process is simulated, the blocking is generated and relieved, the conditions of injection pressure, liquid production and the like are observed, recording and metering are carried out, and the liquid production and development effects of different blocking influences of the chemical flooding are evaluated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (5)
1. A chemical flooding injection well and production well jam analogue means, its characterized in that: the device comprises a model box, an injection well simulation pipe column, a production well simulation pipe column, a blocked production well simulation pipe column, a saturation electrode pair and a pressure sensor;
the model box is of a closed square box body structure, quartz sand is filled in the model box, the inner space of the model box is divided into an original pore infiltration area and a blocking area according to the number of the filled quartz sand, and the number of the quartz sand in the blocking area is larger than that of the quartz sand in the original pore infiltration area;
the injection well simulation pipe column is inserted into the original hole seepage area from the side wall of the model box, the production well simulation pipe column is also inserted into the original hole seepage area from the side wall of the model box, and the blocking production well simulation pipe column is inserted into the blocking area from the side wall of the model box;
a saturation electrode pair and a pressure sensor are arranged in quartz sand filled in the model box; the saturation electrode pairs are arranged in a matrix at intervals, and the pressure sensors and the saturation electrodes are arranged at intervals;
the production well simulation pipe column comprises a first production well simulation pipe column, a second production well simulation pipe column and a third production well simulation pipe column, and the first production well simulation pipe column, the second production well simulation pipe column and the third production well simulation pipe column are respectively inserted from the side wall of a model box different from the injection well simulation pipe column;
valves are arranged on the injection well simulation pipe column, the production well simulation pipe column and the plugged production well simulation pipe column.
2. A chemical flooding injection well and production well plugging simulation apparatus according to claim 1, wherein: the size of the model box is 30cm by 4.5cm.
3. A chemical flooding injection well and production well plugging simulation apparatus according to claim 1, wherein: the quartz sand in the original pore infiltration area is 60-80 meshes, and the quartz sand in the blocking area is 100-120 meshes.
4. A chemical flooding injection well and production well plugging simulation apparatus according to claim 1, wherein: the injection well simulation pipe column, the production well simulation pipe column and the blocking production well simulation pipe column are formed by cutting seams of stainless steel pipe lines, and the outer parts of the injection well simulation pipe column, the production well simulation pipe column and the blocking production well simulation pipe column are formed by encircling stainless steel nets.
5. A method of simulating using the chemical flooding injection well and production well plugging simulation apparatus of claim 1, comprising the steps of:
step one, determining an original hole infiltration area and a blocking area in a model box according to a design scheme and a blocking actual condition, arranging a saturation electrode and a pressure sensor along the whole model in advance, and filling quartz sand with different meshes into the original hole infiltration area and the blocking area respectively;
setting an injection well simulation pipe column and a production well simulation pipe column which are communicated with the original pore infiltration zone, setting a blocking production well simulation pipe column which is communicated with the blocking zone, and installing a valve at each inlet and outlet;
step three, dry weight is weighed, saturated water is vacuumized, wet weight is weighed again, saturated oil is carried out according to the actual displacement mode of oil flooding, the original pore volume and the saturated oil volume are recorded, and the porosity and the saturation are calculated;
and fourthly, according to the design scheme, the constant-speed water drive is used for carrying out a chemical drive test after being converted into constant pressure, the well opening/closing conversion of the production well and the blocked well is carried out according to the design scheme, the blocking generation and the blocking release in the chemical drive process are simulated, the injection pressure and the liquid production condition are observed, the recording and the metering are carried out, and the liquid production and the development effect of different blocking influences of the chemical drive are evaluated.
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