CN111024771B - Method for measuring water content of oil-water mixed liquid in oil well - Google Patents
Method for measuring water content of oil-water mixed liquid in oil well Download PDFInfo
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- CN111024771B CN111024771B CN201911174204.6A CN201911174204A CN111024771B CN 111024771 B CN111024771 B CN 111024771B CN 201911174204 A CN201911174204 A CN 201911174204A CN 111024771 B CN111024771 B CN 111024771B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- 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
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
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Abstract
The application discloses a method for measuring water content of oil-water mixed liquid in an oil well, and belongs to the technical field of oil field development. The method comprises the following steps: a plurality of groups of resistivity measuring plates are horizontally arranged in an experiment pipe horizontally placed in experiment equipment, oil-water mixed liquid with various water contents is prepared, the resistivity of each oil-water mixed liquid at various water levels is detected, and the corresponding relation among the water level, the water content and the resistivity is obtained. And installing resistivity measuring plates with the same group number as the resistivity measuring plates in the experiment tubes in the horizontal tube section of the wellhead pipeline of the target oil well, detecting the target resistivity of the oil-water mixed liquid at a plurality of different water levels, determining the water content of the oil-water mixed liquid at the plurality of different water levels of the target oil well according to the corresponding relation, and calculating the arithmetic mean value to obtain the water content of the oil-water mixed liquid in the target oil well. By adopting the method and the device, the operation flow is simplified, the real-time monitoring of the water content of the target oil well is realized, and a foundation is laid for remote digital transmission.
Description
Technical Field
The application relates to the technical field of oilfield development, in particular to a method for measuring the water content of oil-water mixed liquid in an oil well.
Background
In oil field development, it is necessary to measure the water content of an oil-water mixture in an oil well every day. By tracking the change of the water content, the production dynamic rule of the oil well can be found, thereby adjusting the development of the oil field.
At present, the water content of the oil-water mixed liquid in the oil well is measured by sampling the oil well from a tube well worker, then the oil-water mixed liquid is sent to a laboratory, and the water content of the oil-water mixed liquid is detected in the laboratory.
In the process of implementing the present application, the inventor finds that the prior art has at least the following problems:
the operation flow is complicated, and the timeliness for detecting the water content is poor.
Disclosure of Invention
The embodiment of the application provides a method for measuring the water content of oil-water mixed liquid in an oil well, and the problems that the operation flow is complicated and the timeliness for detecting the water content is poor can be solved. The technical scheme is as follows:
carrying out oil-water separation on the oil-water mixed solution of the target oil well to obtain an oil sample and a water sample in the oil-water mixed solution;
preparing a plurality of oil-water mixed liquids with different water contents based on the oil sample and the water sample;
horizontally installing a plurality of groups of resistivity measuring plates in an experiment tube horizontally placed in experiment equipment, wherein the first radial section is divided into a plurality of equal-area areas by the intersection line of a plurality of planes where the plurality of groups of resistivity measuring plates in the experiment tube are respectively located and the first radial section of the experiment tube;
detecting the resistivity of each oil-water mixed liquid at a plurality of different water levels through the plurality of groups of resistivity determination plates to obtain the corresponding relation among the water level, the water content and the resistivity;
when the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, and the target resistivity of an oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected, wherein the structure of the horizontal pipe section of the wellhead pipeline is the same as that of an experimental pipe, the number of groups of resistivity measuring plates in the experimental pipe is the same as that of the resistivity measuring plates in the horizontal pipe section of the wellhead pipeline, and the radial cross section is divided into a plurality of equal-area areas by intersecting lines of a plurality of planes in which the plurality of groups of resistivity measuring plates in the horizontal pipe section are respectively located and the radial cross section of the horizontal pipe section;
determining the water contents of the oil-water mixed solution in the target oil well at a plurality of different water levels based on the corresponding relation among the water levels, the water contents and the resistivity and the target resistivity at the plurality of different water levels;
and taking the average value of the water contents at the different water levels as the water content of the oil-water mixed liquid of the target oil well.
In a possible embodiment, the preparing the oil-water mixture with a plurality of different water contents based on the oil sample and the water sample includes:
and gradually adding the water sample into the oil sample to prepare various oil-water mixed liquids with different water contents.
In one possible embodiment, the plurality of different water cuts comprises 1%, 2%, \8230:, 99%.
In one possible embodiment, the sets of resistivity measurement plates are arranged in a vertical direction.
In one possible embodiment, before horizontally installing the plurality of resistivity-determining plates in a horizontally-placed test tube of the test apparatus, the method further comprises:
determining the number of water levels of which the resistivity needs to be detected;
based on the number, a number of sets of resistivity survey plates is determined.
In one possible embodiment, the determining the number of water levels for which resistivity needs to be detected includes:
and determining the number of water levels of which the resistivity needs to be detected based on the water content range of the oil layer corresponding to the target oil well.
In a possible implementation, the determining, based on the water cut range of the corresponding oil layer of the target oil well, the number of water levels for which resistivity needs to be detected includes:
and determining the number of the water levels of the resistivity to be detected corresponding to the water content range of the oil layer corresponding to the target oil well based on the corresponding relation between the pre-stored water content range and the number of the water levels of the resistivity to be detected.
In one possible embodiment, in the correspondence relationship, the number of water levels having a water content in the range of 0 to 20% corresponding to the detection resistivity is 1, the number of water levels having a water content in the range of 20 to 60% corresponding to the detection resistivity is 2, the number of water levels having a water content in the range of 60 to 90% corresponding to the detection resistivity is 3, and the number of water levels having a water content in the range of more than 90% corresponding to the detection resistivity is 4.
In one possible embodiment, the method further comprises:
when the water content range of the oil layer corresponding to the target oil well changes, re-determining the number of groups of the resistivity measuring plates based on the pre-stored corresponding relation between the water content range and the number of groups of the resistivity measuring plates;
and horizontally installing the resistivity measuring plates with the determined groups in the experiment tube, and detecting the resistivity of each oil-water mixed liquid at a plurality of different water levels again to obtain the corresponding relation among the water level, the water content and the resistivity.
In one possible embodiment, the resistivity measurement plate has an insulating material on the outside and one of graphite, platinum, nickel, copper and aluminum on the inside.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
after an oil sample and a water sample of a target oil well are obtained through oil-water separation, oil-water mixed liquid with various different water contents is prepared, a plurality of groups of resistivity determination plates are horizontally arranged in an experiment pipe horizontally placed in experiment equipment, the resistivity of each oil-water mixed liquid at various water levels is detected, and the corresponding relation among the water level, the water content and the resistivity is obtained. When the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, the target resistivity of the oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected, the water content of the oil-water mixed liquid in the target oil well at the plurality of different water levels is determined, and the average value of the water content at the plurality of different water levels is used as the water content of the oil-water mixed liquid in the target oil well. Adopt this application, simplified the operation flow, need not the oil-water mixture liquid of sampling and send the laboratory to detect, can improve the promptness that the moisture content detected, and the level divides radial cross section into a plurality of equal area regions to the multiple planes at installation multiunit resistivity survey board place respectively and the radial cross section's of well head pipeline intersection line, each regional length multiplication with the oil-water mixture liquid flow direction can guarantee that the volume of oil-water mixture liquid is equal in different water level departments, has improved the accuracy that the moisture content detected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining water content of a mixed oil-water solution in an oil well according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for determining water content of a mixed oil-water solution in an oil well according to an embodiment of the present disclosure;
FIG. 3 is a graph of resistivity versus moisture content according to an embodiment of the present disclosure;
FIG. 4 is a side sectional view of an apparatus for measuring water content of a mixture of oil and water in an oil well according to an embodiment of the present disclosure;
FIG. 5 is a top cross-sectional view of an apparatus for measuring water content of a mixture of oil and water in an oil well according to an embodiment of the present application;
FIG. 6 is a cross-sectional view of an apparatus for measuring water content of an oil-water mixture in an oil well, taken along a flow direction of the oil-water mixture according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a method for measuring the water content of an oil-water mixed liquid in an oil well, and the method can be applied to the field of oil field development. Fig. 1 is a flowchart of a method for determining water content of a mixture of oil and water in an oil well according to an embodiment of the present disclosure, and referring to fig. 1, the method includes:
in step 101, oil-water separation is performed on the oil-water mixture of the target oil well to obtain an oil sample and a water sample in the oil-water mixture.
In step 102, a plurality of oil-water mixtures with different water contents are prepared based on the oil sample and the water sample.
In step 103, a plurality of sets of resistivity-determining plates are horizontally mounted in a horizontally-placed test tube of the test apparatus.
In step 104, the resistivity of each oil-water mixture at a plurality of different water levels is detected through a plurality of groups of resistivity determination plates, and the corresponding relation among the water level, the water content and the resistivity is obtained.
In step 105, when the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, and the target resistivity of the oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected.
In step 106, the water content of the oil-water mixed liquid in the target oil well at a plurality of different water levels is determined based on the corresponding relation among the water levels, the water content and the resistivity and the target resistivity at the plurality of different water levels.
In step 107, the average of the water contents at the plurality of different water levels is set as the water content of the oil-water mixture of the target well.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
after an oil sample and a water sample of a target oil well are obtained through oil-water separation, oil-water mixed liquid with various different water contents is prepared, a plurality of groups of resistivity determination plates are horizontally arranged in an experiment pipe horizontally placed in experiment equipment, the resistivity of each oil-water mixed liquid at various water levels is detected, and the corresponding relation among the water level, the water content and the resistivity is obtained. When the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, the target resistivity of the oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected, the water content of the oil-water mixed liquid in the target oil well at the plurality of different water levels is determined, and the average value of the water content at the plurality of different water levels is used as the water content of the oil-water mixed liquid in the target oil well. By adopting the method and the device, the operation flow is simplified, the oil-water mixed liquid is not required to be sampled and sent to a laboratory for detection, and the timeliness of the detection of the water content can be improved.
FIG. 2 is a flow chart of a method for measuring water content of a mixed oil-water solution in an oil well according to an embodiment of the present application. Referring to fig. 2, the embodiment includes:
in step 201, oil-water separation is performed on the oil-water mixture of the target oil well to obtain an oil sample and a water sample in the oil-water mixture.
In practice, the oil-water mixture is extracted from the target well to obtain an oil-water mixture for the target well, and then an oil-water separation experiment is performed in a laboratory. According to the density difference of water and oil, the separation of an oil sample and a water sample can be realized through gravity settling.
In step 202, a plurality of oil-water mixtures with different water contents are prepared based on the oil sample and the water sample.
In the implementation, after technical staff obtain water sample and oil sample in the laboratory, add the water sample in the oil sample gradually, in the in-process of adding the water sample, prepare the oil water mixed solution that obtains multiple different moisture contents. Wherein, the water content of various types can include 1%, 2%, 8230, 823099%.
In step 203, the number of water levels for which resistivity needs to be detected is determined based on the water content range of the oil reservoir corresponding to the target well.
In the implementation, in the production process of a target oil well, due to the difference of oil-water density and the instability of water content, the water content of different water levels in a wellhead pipeline is different, and the resistivity of the wellhead pipeline is also different, so that the number of the water levels of which the resistivity needs to be detected can be determined according to the water content range of an oil layer. Firstly, a technician can obtain the water content range of the oil layer corresponding to the target oil well according to the interpretation data of the oil layer. Then, according to the corresponding relation between the pre-stored water content range and the number of the water levels of which the resistivity needs to be detected, the number of the water levels of which the resistivity needs to be detected and which correspond to the water content range of the oil layer corresponding to the target oil well can be determined.
In one possible embodiment, the pre-stored water cut range and the number of water levels for which resistivity needs to be detected may be in the form of a table or a curve.
For example, the technician may prepare a table of the water content range and the number of water levels at which the resistivity needs to be detected in advance, and find the number of water levels at which the resistivity needs to be detected corresponding to the water content range in the table after obtaining the water content range of the oil reservoir corresponding to the target oil well. In the correspondence relationship between the water content range and the number of water levels for which resistivity needs to be detected, the larger the value of the water content range, the larger the number of water levels for which resistivity needs to be detected.
In step 204, the number of sets of resistivity survey plates is determined based on the number of water levels for which resistivity surveys are desired.
Wherein, the outer side of the resistivity determination plate is an insulating object, and the inner side material is one of graphite, platinum, nickel, copper and aluminum.
In implementation, after acquiring the number of the water levels of which the resistivity needs to be detected, the technician may use the number of the water levels of which the resistivity needs to be detected as the number of the groups of the resistivity measurement plates.
In step 203 and step 204, a technician may determine the number of water levels requiring resistivity detection according to the water content range of the oil layer corresponding to the target oil well, and use the number of water levels requiring resistivity detection as the group number of resistivity determination plates.
For example, when the target well corresponds to a low water content reservoir, i.e., a water content in the range of 0 to 20%, the number of water levels corresponding to the resistivity to be detected may be 1, and a set of resistivity measuring plates may be installed in the wellhead pipeline of the well. When the oil layer corresponding to the target oil well is a medium water-containing oil layer, namely the water content range is 20-60%, the number of the corresponding water levels needing to detect the resistivity can be 2, and two groups of resistivity measuring plates can be arranged in a wellhead pipeline of the oil well. When the oil layer corresponding to the target oil well is a high water-bearing oil layer, namely the water content range is 60-90%, the number of the corresponding water levels needing to detect the resistivity can be 3, and three groups of resistivity measuring plates can be arranged in a wellhead pipeline of the oil well. When the oil layer corresponding to the target oil well is an ultra-high water-content oil layer, namely the water content is more than 90%, the number of the corresponding water levels needing to detect the resistivity can be 4, and four groups of resistivity determination plates can be arranged in a wellhead pipeline of the oil well.
In one possible embodiment, when the water content range of the corresponding oil layer of the target oil well has a smaller value, a plurality of groups of resistivity measuring plates can be used, and the detected value is more accurate.
In step 205, a plurality of resistivity measurement plates are horizontally installed in a horizontally placed experiment tube of the experiment apparatus, and the resistivity of each oil-water mixture at a plurality of different water levels is detected to obtain the corresponding relationship among the water level, the water content and the resistivity.
The first radial section of the experiment tube is divided into a plurality of equal-area areas by intersecting lines of a plurality of planes where a plurality of groups of resistivity measurement plates in the experiment tube are respectively located and the first radial section.
In the implementation, the laboratory is provided with experimental equipment for simulating a wellhead pipeline in a target oil well, after the group number of the resistivity measuring plates required by the target oil well is obtained, the group number of the resistivity measuring plates are horizontally installed in the horizontally placed experimental pipes of the experimental equipment, and each group of the resistivity measuring plates corresponds to one water level. Inputting the prepared oil-water mixed liquid with various water contents into an experimental tube, and detecting the resistivity of each oil-water mixed liquid at a plurality of different water levels by using a resistivity measuring plate to obtain the corresponding relation among the water level, the water content and the resistivity.
For example, after obtaining an oil sample and a water sample through oil-water separation, a technician may first take a certain amount of the oil sample, measure the resistivity of the oil sample, gradually add the water sample to the oil sample, prepare an oil-water mixture with a water content of 1% to 99%, measure the resistivity of the oil-water mixture with a water content of 1% to 99%, and prepare a resistivity table of the target oil well with different water contents, where a, B, C, and D in the table represent the resistivities corresponding to 1%, 2%, 98%, and 99%, and the technician may perform subsequent operations according to the table, as shown in table 1.
TABLE 1
| Resistivity of | A | B | …… | C | D |
| |
1％ | 2％ | …… | 98％ | 99％ |
For example, fig. 3 is a graph showing a change tendency of resistivity with water content, the conductivity of the oil-water mixture is related to the water content of the oil-water mixture, and the resistivity is decreased as the conductivity is better as the water content is higher. As shown in FIG. 3, when the water content is low, for example, 1% to 40%, the conductivity is poor and the resistivity is large. When the water content is moderate, such as 40% to 70%, the conductivity is enhanced, the resistivity is reduced, and the resistivity changes faster with the water content. When the water content is higher, such as 70% to 90%, the conductivity is strong, the resistivity is small, and the change of the resistivity along with the water content is slow. In addition, when the oil-water mixture is electrolyzed, the electrolysis pressure of the oil-water mixture is constant, when the passing current changes, the resistivity of the oil-water mixture changes, the passing current is related to the water content of the oil-water mixture, the conductivity is higher when the water content of the oil-water mixture is larger, the passing current is higher, and therefore the water content of the oil-water mixture is related to the resistivity of the oil-water mixture.
In step 206, when the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, and the target resistivity of the oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected.
The horizontal pipe section of the experiment pipe and the horizontal pipe section of the wellhead pipeline have the same structure, and the number of resistivity measurement plate groups in the experiment pipe is the same as that of the resistivity measurement plate groups in the horizontal pipe section of the wellhead pipeline. The radial section is divided into a plurality of equal-area areas by the intersection lines of a plurality of planes in which a plurality of groups of resistivity measurement plates in the horizontal section of the wellhead pipeline of the target oil well are respectively located and the radial section of the horizontal section.
In implementation, a technician may horizontally install the same number of resistivity measurement plates as the experiment tube in the horizontal pipe section of the wellhead pipeline of the target oil well, and detect the target resistivity of the oil-water mixture in the wellhead pipeline of the target oil well at a plurality of different water levels according to the resistivity measurement plates horizontally installed in the horizontal pipe section.
In one possible embodiment, when the number of sets of resistivity measuring plates is one, the resistivity measuring plates are installed horizontally after selecting a water level corresponding to the middle of the wellhead pipeline in the horizontal section of the wellhead pipeline of the target well. When the number of the resistivity measuring plates is multiple, different water levels are selected in the same area in the horizontal pipe section of the wellhead pipeline of the target oil well, after the first water level is selected, the first group of resistivity measuring plates are horizontally installed, after the second water level is selected, the second group of resistivity measuring plates are horizontally installed, and the multiple groups of resistivity measuring plates are sequentially installed.
In a possible embodiment, when the water content of the target oil well is measured, and the number of the resistivity measurement plates is one, a technician may contact the electrode points on the two electrode plates of the resistivity measurement plate set by using a resistivity tester according to the resistivity measurement plate installed horizontally, and use the measured resistivity as the resistivity measured by the resistivity measurement plate set, so as to obtain the target resistivity of the oil-water mixture in the horizontal pipe section of the wellhead pipeline of the target oil well.
In another possible embodiment, when the resistivity measurement plates are in multiple groups during the water cut measurement of the target oil well, a technician may detect the resistivity of the oil-water mixture at multiple different water levels in the horizontal pipe section of the wellhead pipeline of the target oil well according to the multiple groups of resistivity measurement plates installed horizontally, so as to obtain the target resistivity at the multiple different water levels.
The embodiment of the application also provides equipment for measuring the water content of the oil-water mixed liquid in the oil well, and the equipment can be an experimental pipe placed for the level of the experimental equipment and also can be a horizontal pipe section of a wellhead pipeline of a target oil well because the experimental pipe has the same structure with the horizontal pipe section of the wellhead pipeline. Fig. 4 is a side sectional view of an apparatus for measuring a water content of an oil-water mixture in an oil well according to an embodiment of the present invention, fig. 5 is a top sectional view of the apparatus for measuring a water content of an oil-water mixture in an oil well according to the embodiment of the present invention, and fig. 6 is a sectional view of the apparatus for measuring a water content of an oil-water mixture in an oil well according to the embodiment of the present invention, taken along a flow direction of the oil-water mixture. The device takes two groups of resistivity measurement plates as an example to explain a scheme, and as shown in figure 4, the device comprises an oil-water mixed liquid 1, a wellhead pipeline 2, an electrode plate 3-1, an electrode plate 3-2, an electrode plate 4-1, an electrode plate 4-2, an electrode point 5-1, an electrode point 5-2, an electrode point 6-1, an electrode point 6-2 and a fixed shaft 7.
The group of resistivity measuring plates comprises two electrode plates, wherein an electrode plate 3-1 and an electrode plate 3-2 form a group, an electrode plate 4-1 and an electrode plate 4-2 form a group, electrode points are respectively arranged on the electrode plates, the electrode points arranged on the electrode plate 3-1 and the electrode plate 3-2 are an electrode point 5-1 and an electrode point 5-2, and the electrode points arranged on the electrode plate 4-1 and the electrode plate 4-2 are an electrode point 6-1 and an electrode point 6-2.
As shown in fig. 5, the resistivity measuring plate is horizontally fixed in the wellhead pipeline 2 by a fixing shaft 7, the electrode points on the electrode plates are all extended out of the wellhead pipeline 2, and the resistivity between the electrode plates can be measured by contacting the electrode points on the two electrode plates with a resistivity tester. When the electrode point 5-1 and the electrode point 5-2 are contacted with a resistivity tester, the resistivity between the electrode plate 3-1 and the electrode plate 3-2 can be measured. When the electrode point 6-1 and the electrode point 6-2 are contacted with a resistivity tester, the resistivity between the electrode plate 4-1 and the electrode plate 4-2 can be measured.
As shown in FIG. 6, the electrode plate 3-1 and the electrode plate 3-2 are at the same water level, and the electrode plate 4-1 and the electrode plate 4-2 are at the same water level. The resistivity measurement plates are arranged in the vertical direction, namely the resistivity measurement plates are aligned in the vertical direction, the electrode plate 3-2 and the electrode plate 4-2 are aligned in the vertical direction, and the electrode plate 3-1 and the electrode plate 4-1 are aligned in the vertical direction. And if a plurality of groups of resistivity measurement plates are installed according to equal area, namely the area formed by the upper electrode plate 3-1, the electrode plate 3-2 and the upper wellhead pipeline, the area formed by the electrode plate 3-1, the electrode plate 3-2, the electrode plate 4-1 and the electrode plate 4-2 and the area formed by the electrode plate 4-1, the electrode plate 4-2 and the lower wellhead pipeline are equal.
In step 207, the water content of the oil-water mixed liquid in the target oil well at a plurality of different water levels is determined based on the corresponding relation among the water levels, the water content and the resistivity and the target resistivity at the plurality of different water levels.
In implementation, after target resistivities of the oil-water mixed liquid at a plurality of different water levels in a horizontal pipe section of a wellhead pipeline of a target oil well are obtained, the water contents of the oil-water mixed liquid at the different water levels in the target oil well are found by referring to the corresponding relations among the water levels, the water contents and the resistivities.
In step 208, the average of the water contents at the plurality of different water levels is set as the water content of the oil-water mixture of the target well.
In practice, the water contents of the oil-water mixture in the target oil well at a plurality of different water levels are obtained, and then an arithmetic average value of the water contents at the plurality of different water levels is obtained, and the average value is used as the water content of the oil-water mixture in the target oil well.
In one possible implementation mode, when a group of resistivity measuring plates are horizontally installed, after target resistivity among the group of resistivity measuring plates is obtained through detection, target water content corresponding to the target resistivity is determined according to the corresponding relation between the water content and the resistivity, and the target water content is used as the water content of the oil-water mixed liquid in the wellhead pipeline.
In another possible implementation manner, when a plurality of groups of resistivity measurement plates are horizontally installed, after target resistivities among the plurality of groups of resistivity measurement plates are detected, the target water content corresponding to each target resistivity is determined based on the corresponding relation among the water level, the water content and the resistivity, and the average value of the target water content corresponding to each target resistivity is used as the water content of the oil-water mixed liquid in the wellhead pipeline.
In one embodiment, when the number of water levels for detecting resistivity is 2, two sets of resistivity measurement plates are taken as an example. Firstly, a technician extracts oil-water mixed liquid in a target oil well, and performs dehydration separation in a laboratory to obtain an oil sample and a water sample of the target oil well. The laboratory is provided with an experimental device for simulating a wellhead pipeline in a target oil well, and the experimental device is provided with the same groups of resistivity measuring plates as those in the wellhead pipeline of the target oil well, namely two groups of resistivity measuring plates are arranged in the experimental device. Taking a certain amount of oil sample, measuring the resistivity of the oil sample, gradually adding the water sample into the oil sample, preparing oil-water mixed liquid with the water content of 1-99%, respectively measuring the resistivity of the oil-water mixed liquid with the water content of 1-99% by using two groups of resistivity measuring plates, wherein the resistivity value corresponding to each water content is two groups, and thus a corresponding table of the water content and the resistivity of the two groups of resistivity measuring plates can be prepared. Then, two groups of horizontal resistivity measuring plates are installed in a wellhead pipeline below a target oil well heat-insulating sleeve, different water levels are selected in equal area, after a first water level is selected, the first group of resistivity measuring plates are installed horizontally, and after a second water level is selected, the second group of resistivity measuring plates are installed horizontally. And respectively measuring two groups of resistivities of a first water level and a second water level by using a resistivity tester, correspondingly searching the resistivity of the first water level in a table of a first group of resistivity measuring plates to obtain corresponding water content, correspondingly searching the resistivity of the second water level in a table of a second group of resistivity measuring plates to obtain corresponding water content, averaging the water contents of the two groups of resistivity measuring plates, and taking the obtained average value as the water content of the oil-water mixed liquid in the wellhead pipeline of the target oil well.
In one possible embodiment, when the water content range of the oil reservoir corresponding to the target well changes, the number of sets of resistivity measurement plates may be newly determined according to the correspondence relationship between the water content range and the number of sets of resistivity measurement plates stored in advance. And horizontally installing the resistivity measuring plates with the redetermined groups in the experiment tube, redetecting the resistivity of each oil-water mixed liquid at a plurality of different water levels to obtain the corresponding relation among the water level, the water content and the resistivity, and then carrying out subsequent operation.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
after an oil sample and a water sample of a target oil well are obtained through oil-water separation, oil-water mixed liquid with various different water contents is prepared, a plurality of groups of resistivity determination plates are horizontally arranged in an experiment pipe horizontally placed in experiment equipment, the resistivity of each oil-water mixed liquid at various water levels is detected, and the corresponding relation among the water level, the water content and the resistivity is obtained. When the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, the target resistivity of the oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected, the water content of the oil-water mixed liquid in the target oil well at the plurality of different water levels is determined, and the average value of the water content at the plurality of different water levels is used as the water content of the oil-water mixed liquid in the target oil well. By adopting the method and the device, the operation flow is simplified, the oil-water mixed liquid does not need to be sampled and is sent to a laboratory for detection, the timeliness of the detection of the water content can be improved, the real-time monitoring of the water content of the target oil well is realized, and a foundation is laid for remote digital transmission. And the radial cross section is divided into a plurality of equal-area areas by the intersecting line of a plurality of planes where the plurality of groups of resistivity measuring plates are horizontally arranged and the radial cross section of the wellhead pipeline, and the volumes of the oil-water mixed liquid at different water levels can be ensured to be equal by multiplying the flowing length of the oil-water mixed liquid in each area, so that the accuracy of water content detection is improved.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described in detail herein.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A method for measuring the water content of oil-water mixed liquid in an oil well is characterized by comprising the following steps:
performing oil-water separation on the oil-water mixed solution of the target oil well to obtain an oil sample and a water sample in the oil-water mixed solution;
preparing a plurality of oil-water mixed liquids with different water contents based on the oil sample and the water sample;
determining the number of water levels of which the resistivity needs to be detected based on the water content range of the oil layer corresponding to the target oil well;
determining the number as a number of sets of resistivity determination plates;
horizontally installing a plurality of groups of resistivity measuring plates in an experiment tube horizontally placed in experiment equipment, wherein the first radial section is divided into a plurality of equal-area areas by the intersection line of a plurality of planes where the plurality of groups of resistivity measuring plates in the experiment tube are respectively located and the first radial section of the experiment tube;
detecting the resistivity of each oil-water mixed liquid at a plurality of different water levels through the plurality of groups of resistivity determination plates to obtain the corresponding relation among the water levels, the water content and the resistivity;
when the water content of the target oil well is measured, a plurality of groups of resistivity measuring plates are installed in a horizontal pipe section of a wellhead pipeline of the target oil well, and the target resistivity of oil-water mixed liquid in the horizontal pipe section at a plurality of different water levels is detected, wherein the structure of the horizontal pipe section of the experiment pipe is the same as that of the horizontal pipe section of the wellhead pipeline, the number of resistivity measuring plate groups in the experiment pipe is the same as that of the resistivity measuring plate groups in the horizontal pipe section, and the radial cross section is divided into a plurality of equal-area areas by intersection lines of a plurality of planes where the plurality of groups of resistivity measuring plates in the horizontal pipe section are respectively located and the radial cross section of the horizontal pipe section;
determining the water contents of the oil-water mixed solution in the target oil well at a plurality of different water levels based on the corresponding relation among the water levels, the water contents and the resistivity and the target resistivity at the plurality of different water levels;
and taking the average value of the water contents at the plurality of different water levels as the water content of the oil-water mixed liquid of the target oil well.
2. The method of claim 1, wherein preparing a plurality of oil-water mixtures with different water contents based on the oil sample and the water sample comprises:
and gradually adding the water sample into the oil sample to prepare various oil-water mixed liquids with different water contents.
3. The method of claim 2, wherein the plurality of different water cuts comprises 1%, 2%, 8230, 823099%.
4. The method of claim 1, wherein the plurality of resistivity measurement plates are arranged in a vertical orientation.
5. The method of claim 1, wherein the determining the number of water levels for which resistivity needs to be detected based on the water cut range of the reservoir corresponding to the target well comprises:
and determining the number of the water levels of the resistivity to be detected corresponding to the water content range of the oil layer corresponding to the target oil well based on the corresponding relation between the pre-stored water content range and the number of the water levels of the resistivity to be detected.
6. The method according to claim 5, wherein in the correspondence relationship, the number of water levels having a water content in a range of 0 to 20% corresponding to the detected resistivity is 1, the number of water levels having a water content in a range of 20 to 60% corresponding to the detected resistivity is 2, the number of water levels having a water content in a range of 60 to 90% corresponding to the detected resistivity is 3, and the number of water levels having a water content in a range of more than 90% corresponding to the detected resistivity is 4.
7. The method of claim 6, further comprising:
when the water content range of the oil layer corresponding to the target oil well changes, re-determining the number of groups of the resistivity measuring plates based on the pre-stored corresponding relation between the water content range and the number of groups of the resistivity measuring plates;
and horizontally installing the resistivity measuring plates with the determined groups in the experiment tube, and detecting the resistivity of each oil-water mixed liquid at a plurality of different water levels again to obtain the corresponding relation among the water level, the water content and the resistivity.
8. The method of any one of claims 1-7, wherein the resistivity measurement plate has an outer side of an insulating body and an inner side of one of graphite, platinum, nickel, copper, and aluminum.
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