CN113638732B - Method and device for judging oil well casing damage - Google Patents
Method and device for judging oil well casing damage Download PDFInfo
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- CN113638732B CN113638732B CN202010325816.7A CN202010325816A CN113638732B CN 113638732 B CN113638732 B CN 113638732B CN 202010325816 A CN202010325816 A CN 202010325816A CN 113638732 B CN113638732 B CN 113638732B
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- 239000003129 oil well Substances 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 43
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- 230000001174 ascending effect Effects 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 107
- 239000007788 liquid Substances 0.000 claims description 56
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 25
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 25
- 238000000605 extraction Methods 0.000 claims description 14
- 238000007405 data analysis Methods 0.000 claims description 13
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- 238000012545 processing Methods 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 238000003745 diagnosis Methods 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 description 10
- 230000002159 abnormal effect Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
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- 239000000460 chlorine Substances 0.000 description 1
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Classifications
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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
-
- 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
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
-
- 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 provides a method and a device for judging oil well casing damage, which are used for acquiring first data of an oil well in real time to obtain a graph of the first data changing along with time; acquiring second data of the oil well in a preset time period; and if the graph is in an ascending trend and the second data accords with a preset standard, determining oil well casing loss, wherein the preset standard is used for indicating the change trend of the second data in the preset time period. The invention can monitor and acquire the first data of the oil well at any time, and combines the first data with the second data to judge whether the oil well sleeve damage occurs, so that the temperature or the pressure in the oil well can be monitored only in the state of closing the well in the prior art, the problems of long oil well sleeve damage diagnosis period, high difficulty and low accuracy in the prior art are overcome, and the invention can rapidly and accurately judge whether the oil well sleeve damage occurs or not and ensure the normal production of the oil well.
Description
Technical Field
The invention relates to the technical field of oil field oil extraction engineering, in particular to a method and a device for judging oil well casing damage.
Background
In the petroleum exploitation process, the casing is damaged due to external factors, so that the oil well becomes a casing damage well, the normal production damage of the oil well to the oil field is large due to casing damage of the oil well, the production time rate and the yield are influenced, the well shaft and the production layer are irreversibly damaged due to long-time water and sand yielding after casing damage, and even the oil well is scrapped when serious, and finally the reserve is lost.
In order to find out the casing damage of an oil well in time, in the related technology, a static temperature and static pressure gradient method and an engineering logging method are generally adopted to analyze whether the casing damage occurs in the oil well, and a static temperature and static pressure gradient method is taken as an example, a temperature testing instrument and a pressure measuring instrument are placed down to the bottom of the well in a well closing state, and whether the casing damage occurs is judged according to a tested temperature value and a tested pressure value.
However, the above-described determination method has a disadvantage in that the determination accuracy is low.
Disclosure of Invention
In view of the above problems, the embodiments of the present invention provide a method and an apparatus for determining casing damage of an oil well, so as to solve the technical problem of low determination accuracy in the determination manner in the prior art.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a first aspect of the embodiment of the invention provides a method for judging casing damage of an oil well, which comprises the steps of acquiring first data of the oil well in real time to obtain a graph of time variation of the first data.
And acquiring second data of the oil well in a preset time period.
And if the graph is in an ascending trend and the second data accords with a preset standard, determining oil well casing loss, wherein the preset standard is used for indicating the change trend of the second data in the preset time period.
The method for judging the casing damage of the oil well, wherein the acquiring the first data of the oil well in real time to obtain the graph of the first data changing along with time comprises the following steps: and acquiring the water content of the oil well in real time to obtain a first graph of the change of the water content along with time.
The method for judging the casing damage of the oil well, wherein the acquiring the first data of the oil well in real time to obtain the graph of the time-varying first data, further comprises: and acquiring the liquid yield of the oil well in real time to obtain a second graph of the change of the liquid yield along with time.
The method for judging the casing damage of the oil well, wherein the water content and the liquid production amount are obtained through a flowmeter.
The method for judging the casing damage of the oil well, wherein the step of acquiring the second data of the oil well in the preset time period comprises the following steps: and acquiring the water density, the chloride ion content in water and the sulfate ion content in water of the oil well in a preset time period.
The method for judging the casing damage of the oil well, wherein the acquiring the second data of the oil well in the preset time period further comprises the following steps: and acquiring the distance between the oil extraction liquid level of the oil well and the wellhead within a preset time period.
The method for judging the casing damage of the oil well, wherein the step of acquiring the distance between the oil production liquid level of the oil well and the wellhead in the preset time period comprises the following steps: and obtaining the distance between the oil extraction liquid level of the oil well and the wellhead by using a distance meter.
The method for judging the casing damage of the oil well, wherein the preset standard comprises the following steps: when the liquid production amount rises, the distance between the oil production liquid level and the wellhead is in a decreasing trend; the reduction rate of the chloride ion content in the water is 49% -87%; the water density reduction rate is 23% -29%; the rising value of the sulfate ion content in the water is 10.7-13.8 times of the original stratum water content.
A second aspect of an embodiment of the present invention provides a device for determining casing damage of an oil well, including:
the acquisition unit acquires first data of the oil well and acquires second data in real time; the first data comprise liquid yield and water content; the second data includes the distance between the oil production surface and the wellhead and the water density, the chloride ion content in the water and the sulfate ion content in the water.
The data analysis processing unit is used for drawing a graph of the first data changing along with time by taking time as an abscissa and the first data as an ordinate; the graph was fitted to a graph and analyzed for its appearance as an upward trend.
A judging unit for judging the result according to the data of the data analysis processing unit: and if the first data all show an ascending trend and the second data all accord with a preset standard, judging that the oil well is damaged by the oil well sleeve.
The device for judging the casing damage of the oil well further comprises a display unit, wherein the display unit is used for displaying at least one of the data acquired by the acquisition unit, the graph and the graph fitting result output by the data analysis processing unit and the oil well casing damage judging result output by the judging unit.
The embodiment of the invention provides a method and a device for judging oil well casing damage, which are used for acquiring first data of an oil well in real time to obtain a graph of the change of the first data along with time; acquiring second data of the oil well in a preset time period; and if the graph is in an ascending trend and the second data accords with a preset standard, determining oil well casing loss, wherein the preset standard is used for indicating the change trend of the second data in the preset time period. The embodiment of the invention can monitor and acquire the first data of the oil well at any time, is combined with the second data, and judges whether the oil well casing damage occurs, so that the temperature or the pressure in the oil well can be monitored only in the state of closing the well in the prior art, the problems of long oil well casing damage diagnosis period, high difficulty and low accuracy in the prior art are overcome, and whether the oil well casing damage occurs can be quickly and accurately judged, and the normal production of the oil well is ensured.
In addition to the technical problems, technical features constituting the technical solutions, and beneficial effects caused by the technical features of the technical solutions described above, the method and apparatus for determining casing damage of an oil well provided by the embodiments of the present invention solve other technical problems, other technical features included in the technical solutions, and beneficial effects caused by the technical features, which are described in detail in the detailed description of the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for judging oil well casing damage provided by an embodiment of the invention;
FIG. 2 is a graph of time versus liquid production provided by an embodiment of the present invention;
FIG. 3 is a graph of time-moisture content provided by an embodiment of the present invention;
FIG. 4 is a graph of time versus distance between the production fluid surface and the wellhead provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a device for determining casing damage of an oil well according to an embodiment of the present invention.
Reference numerals:
10: an acquisition unit;
20: a data analysis unit;
30: a determination unit;
40: a display unit;
50: and a memory cell.
Detailed Description
In order to make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the petroleum exploitation process, the casing is damaged due to external factors, so that the oil well becomes a casing damage well, the normal production damage of the oil well to the oil field is large due to casing damage of the oil well, the production time rate and the yield are influenced, the well shaft and the production layer are irreversibly damaged due to long-time water and sand yielding after casing damage, and even the oil well is scrapped when serious, and finally the reserve is lost.
In order to find out the sleeve damage of the oil well in time, in the related technology, a static temperature and static pressure gradient method and an engineering logging method are generally adopted to analyze whether the sleeve damage occurs in the oil well, a static temperature and static pressure gradient method is taken as an example, a temperature testing instrument and a pressure measuring instrument are placed at the bottom of the well in a well closing state, and whether the sleeve damage occurs is judged according to a tested temperature value and a tested pressure value, however, the mode of judging the sleeve damage of the oil well can only be implemented in the well closing state, and the method has the defect of low detection precision and the defect of influencing the normal operation of the oil well.
Therefore, the embodiment of the invention provides a judging method for the oil well casing damage, which can monitor and acquire the first data of the oil well at any time and is combined with the second data to judge whether the oil well casing damage occurs, so that the temperature or the pressure in the oil well can be monitored only in the state of closing the well as in the prior art, the problems of long oil well casing damage diagnosis period, high difficulty and low accuracy in the prior art are overcome, the oil well casing damage can be rapidly and accurately judged, and the normal production of the oil well is ensured.
FIG. 1 is a flow chart of a method for judging oil well casing damage provided by an embodiment of the invention; FIG. 2 is a graph of time versus liquid production provided by an embodiment of the present invention; FIG. 3 is a graph of time-moisture content provided by an embodiment of the present invention; FIG. 4 is a graph of time versus distance between the production fluid surface and the wellhead provided by an embodiment of the present invention; fig. 5 is a schematic diagram of a device for determining casing damage of an oil well according to an embodiment of the present invention.
Referring to fig. 1 to 5, an embodiment of the present invention provides a method for determining casing damage of an oil well, where the method may be implemented by a determining device, and the determining device may be separately provided or may be integrated in other devices.
The method for judging the oil well casing damage can comprise the following steps:
s101, acquiring first data of an oil well in real time to obtain a graph of the first data changing along with time;
it can be understood that in this embodiment, the first data of the oil well can be obtained at any time, and the first data is analyzed to determine whether the first data is in an abnormal state, so as to accurately obtain the actual condition of the oil well, so as to avoid that, as in the prior art, whether the oil well casing is damaged or not can be obtained only in the state of closing the well, improve the monitoring precision, ensure the real-time performance of monitoring, and provide safety guarantee for the safety production of the oil well. Wherein the abnormal state refers to an increase in the first data with an increase in time.
In addition, in step S101, it is necessary to monitor a plurality of first data at different times, then draw a first graph of time-first data with time as the abscissa and first data as the ordinate, and perform curve fitting on the first graph to analyze whether the first graph is an ascending trend.
If the first data is in an ascending trend along with time, the test times of the first data can be increased, so that the problem that the oil well casing damage problem cannot be found in time is avoided, the time that the oil well casing damage is found is shortened, and the loss caused by the fact that the oil well casing damage is not found in time is reduced.
S102, acquiring second data of the oil well in a preset time period.
The second data may be obtained periodically in a predetermined period of time, and supplement the first data, so as to further determine whether the first data is abnormal, and in addition, the predetermined period of time may be half a month or one month, that is, a half month or one month is taken as a test period, and the second data is detected once every half month or one month, which can be understood that the test period is not necessarily limited to the above manner, and may be performed according to the oilfield development management rule.
And S103, if the graph is in an ascending trend and the second data accords with a preset standard, determining the oil well casing loss, wherein the preset standard is used for indicating the change trend of the second data in a preset time period.
When the graph rises in a broken line form or a straight line form and the second data meets the preset standard, the occurrence of oil pipe breakage of the oil well can be determined. The second data may be the water density of the well, the chloride ion content of the water, the sulfate ion content of the water, or the distance between the oil production fluid level and the wellhead.
The embodiment of the invention provides a judging method of oil well casing damage, which is characterized in that first data of an oil well are obtained in real time to obtain a graph of the change of the first data along with time; acquiring second data of the oil well in a preset time period; if the graph is in an ascending trend and the second data accords with a preset standard, determining the oil well casing loss, wherein the preset standard is used for indicating the change trend of the second data in a preset time period. The embodiment of the invention can monitor and acquire the first data of the oil well at any time, is combined with the second data, and judges whether the oil well casing damage occurs, so that the temperature or the pressure in the oil well can be monitored only in the state of closing the well in the prior art, the problems of long oil well casing damage diagnosis period, high difficulty and low accuracy in the prior art are overcome, and whether the oil well casing damage occurs can be quickly and accurately judged, and the normal production of the oil well is ensured. In addition, the second data can be measured within a preset time period, real-time monitoring is not needed, and cost is saved.
Further, acquiring the first data of the oil well in real time to obtain a graph of the first data over time may include: and acquiring the water content of the oil well in real time to obtain a first graph of the change of the water content along with time.
Referring to fig. 3, in the present embodiment, the water content is taken as a criterion, and after the casing is damaged, the water content in the casing is increased, and then the casing is matched with the second data to determine whether the casing is damaged.
Referring to fig. 2, in addition, in order to avoid the defect that the single data is insufficient to indicate the casing damage, the present embodiment further obtains the liquid production amount of the oil well in real time, so as to obtain a second graph of the change of the liquid production amount with time, and when the water content and the liquid production amount both have an ascending trend with time, and the second data meets the preset standard, it can be determined that the oil well casing damage occurs.
The water content is the ratio of the water yield to the liquid yield, the water content and the liquid yield are both obtained through a flowmeter, the flowmeter can adopt a flowmeter with a signal remote transmission function, and the flowmeter can be transmitted to an on-ground control system for storage through signal transmission; and the acquisition time of the data is measured by a timing device so as to manufacture a first graph of time-water content and a second graph of time-liquid production.
In this example, the rising trend of the liquid production amount is expressed as: in the initial stage of oil well casing damage, the rising amplitude is 0.3-0.5 ton/day; where, rise amplitude = daily liquid production per time.
The rising trend of the water content is shown as follows: the rising speed is 0.05-0.1%/day faster than the normal rising speed; wherein the rising speed is the difference of the water content of two continuous days.
In this embodiment, two parameters of the water content and the liquid production amount are detected simultaneously, so that on one hand, the accuracy of measurement data can be ensured, and on the other hand, when the water content is abnormal first, the parameters of the liquid production amount can be measured for several times more, and further verification is performed to determine whether the two parameters are abnormal at the same time.
As a possible embodiment, acquiring the second data of the oil well within the preset time period includes: and acquiring the water density, the chloride ion content in water and the sulfate ion content in water of the oil well in a preset time period.
In the actual production process, the produced liquid of the oil well can be obtained, the liquid is detected, the performance index of the liquid is obtained, and the performance index is stored in the control system.
The second data may include, among other things, water density of the well, chloride ion content of the water, and sulfate ion content of the water.
When the first data accords with the upward trend, the water density of the oil well, the chloride ion content in the water and the sulfate ion content in the water can be checked in the liquid produced at the moment; when the reduction rate of the chloride ion content in the water is 49% -87%; the reduction rate of the water density is 23% -29%; when the rising value of the sulfate ion content in the water is 10.7-13.8 times of the original stratum water content, the sleeve damage of the oil well can be known, and the subsequent maintenance of the oil well is convenient.
It will be appreciated that the standard values for chloride ion content in water are highly dependent on the specific formation layer where the casing damage section of the well occurs. According to the statistical analysis of the previous production big data, the chlorine radical content in the stratum water of the easy-casing-loss section is generally 22-86 g/L, and the chlorine radical content of the stratum water of the production section is 168g/L.
Similarly, the water density drop is highly dependent on the specific formation level at which the well casing damage occurs. According to the statistical analysis of the prior production big data, the formation water density in the easy-casing-loss section is generally 1.03-1.10 g/cm 3 While the density of the stratum water of the producing zone is1.17g/cm 3 。
In this embodiment, the water density, the chloride ion content in water and the sulfate ion content in water are used as the detection basis of the second data at the same time, so that the detection error caused by using single data is avoided, correspondingly, when one of the three data is abnormal, the measurement times of the other two data can be increased, and the accuracy of the predetermined standard is ensured.
Referring to fig. 4, further, acquiring second data of the oil well in a preset time period further includes: and acquiring the distance between the oil extraction liquid level of the oil well and the wellhead within a preset time period.
In the embodiment, the distance between the oil extraction liquid level of the oil well and the wellhead is measured by using the range finder, when the liquid production amount rises, the distance between the oil extraction liquid level and the wellhead is in a decreasing trend, the decreasing rate of the chloride ion content in water is 49-87%, the decreasing rate of the density is 23-29%, the rising value of the sulfate ion content in water is 10.7-13.8 times of the original stratum water content, and four groups of data are used for verifying whether the oil well sleeve damage occurs or not, so that the accuracy can be increased, and the risks of misjudgment and misjudgment are avoided.
The distance measuring instrument may be a common instrument, and the embodiment is not limited herein, but the water content of the original stratum is different according to the exploitation place.
The judging method of the oil well casing damage can monitor the liquid yield and the water content in real time, conduct data analysis and judgment on line in real time, and timely discover abnormal development trend in the data, so that the oil well casing damage problem can be discovered rapidly; meanwhile, the distance between the oil extraction liquid level and the wellhead, the water density, the chloride ion content in water and the sulfate ion content in water are also monitored periodically, and whether the oil well is damaged by the oil well is judged by preset judging standards; the risks of misjudgment and misjudgment are avoided through the combination of the judgment results of the parameters; overcomes the defects that the well closing is difficult to detect and the precision is not high in the static temperature and static pressure gradient method in the prior art.
Referring to fig. 5, the embodiment of the invention further provides a device for judging oil well casing damage, which includes:
an acquisition unit 10 that acquires first data and acquires second data of an oil well in real time; the first data includes liquid production and water content; the second data comprises the distance between the oil extraction liquid surface and the wellhead, the water density, the chloride ion content in water and the sulfate ion content in water;
a data analysis processing unit 20, configured to draw a graph of time variation of the first data with time as an abscissa and the first data as an ordinate; performing curve fitting on the curve graph, and analyzing whether the curve graph shows an ascending trend;
a determining unit 30 for determining a result based on the data of the data analysis processing unit: and if the first data all show an ascending trend and the second data all accord with the preset standard, judging that the oil well is damaged by the oil well sleeve.
The acquisition unit is used for acquiring data of liquid yield and water content, water density, chloride ion content in water, sulfate ion in water and distance between the oil extraction liquid level and the wellhead, the liquid yield and the water content are measured through the flowmeter, the time is measured through the timing device, and in order to facilitate drawing of curves, the flowmeter and the timing device can be connected with a computer or an industrial control instrument through a data line and used for transmitting the liquid yield and the water content measured by the flowmeter and the time corresponding to the data into the computer or the industrial control instrument for storage.
The second data comprises the distance between the oil extraction liquid level and the wellhead, the water density, the chlorine content in the water and the sulfate content in the water, and the obtained result data is input into a computer or an industrial control instrument and stored through on-site detection or laboratory detection after a sample is acquired.
The obtaining unit 10 is further configured to obtain the entered curve fitting parameter, a preset standard, and an oil well casing damage judgment criterion;
a data analysis unit 20 for drawing a graph and fitting the graph, wherein the curve fitting can manually set a correlation coefficient to ensure a straight line or a curve under the set correlation coefficient; after curve fitting, parameters such as a fitting curve, a fitting curve included angle, a stage slope and the like can be directly reflected.
A determining unit 30 for determining a result based on the data of the data analysis processing unit: and if the first data all show an ascending trend and the second data all accord with the preset standard, judging that the oil well is damaged by the oil well sleeve.
In order to facilitate the storage of data, the apparatus provided in this embodiment may further include a storage unit 50.
According to the technical scheme, the data can be acquired, analyzed and judged, the diagnosis indication curve of the oil well casing damage is generated, and the oil well casing damage diagnosis report is formed.
In order to facilitate the understanding of the detected data and results, the apparatus further comprises a display unit 40 for displaying at least one of the data acquired by the data acquisition unit 10, the graph and graph fitting results output by the data analysis processing unit 20, and the well casing damage determination results output by the determination unit 30.
The invention also provides a storage medium comprising a stored program, and the device in which the storage medium is controlled to execute the method when the program runs.
The invention also proposes an electronic device comprising a storage medium comprising: one or more processors coupled to the storage medium, the processors configured to execute program instructions stored in the storage medium; the program instructions execute the method described above when executed.
In this specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The method for judging the casing damage of the oil well is characterized by comprising the following steps of:
acquiring first data of an oil well in real time to obtain a graph of the first data changing with time;
acquiring second data of the oil well in a preset time period;
if the graph is in an ascending trend and the second data accords with a preset standard, determining oil well casing loss, wherein the preset standard is used for indicating the change trend of the second data in the preset time period;
the acquiring the second data of the oil well in the preset time period comprises the following steps:
acquiring the water density, the chloride ion content in water and the sulfate ion content in water of an oil well in a preset time period;
the method for obtaining the water density, the chloride ion content and the sulfate ion content of the oil well specifically comprises the following steps:
obtaining produced liquid of the oil well, and detecting the liquid to obtain performance indexes of the liquid;
the acquiring the second data of the oil well in the preset time period further comprises:
acquiring the distance between the oil extraction liquid level of the oil well and the wellhead within a preset time period;
if the graph is in an ascending trend and the second data accords with a preset standard, determining the oil well casing loss specifically includes:
when the first data accords with the ascending trend, the water density of the oil well, the chloride ion content in the water and the sulfate ion content in the water can be checked; when the chloride ion content in the water, the water density reduction rate and the sulfate ion content in the water rise values meet preset standards, the oil well sleeve damage can be known;
wherein the preset criteria include:
when the liquid production amount rises, the distance between the oil production liquid level and the wellhead is in a decreasing trend;
the reduction rate of the chloride ion content in the water is 49% -87%;
the water density reduction rate is 23% -29%;
the rising value of the sulfate ion content in the water is 10.7-13.8 times of the original stratum water content.
2. The method for determining casing damage of an oil well according to claim 1, wherein the acquiring first data of the oil well in real time to obtain a graph of the first data over time includes: and acquiring the water content of the oil well in real time to obtain a first graph of the change of the water content along with time.
3. The method for determining casing damage of an oil well according to claim 2, wherein the acquiring the first data of the oil well in real time to obtain a graph of the first data over time further comprises: and acquiring the liquid yield of the oil well in real time to obtain a second graph of the change of the liquid yield along with time.
4. A method of determining well casing damage according to claim 3, wherein the water content and the liquid production are obtained by a flowmeter.
5. The method for determining casing damage of an oil well according to claim 1, wherein the step of obtaining the distance between the production fluid level of the oil well and the wellhead within the preset time period comprises:
and obtaining the distance between the oil extraction liquid level of the oil well and the wellhead by using a distance meter.
6. The device for judging the casing damage of the oil well is characterized by comprising the following components:
the acquisition unit acquires first data of the oil well and acquires second data in real time; the first data comprises liquid production amount and water content; the second data comprise the distance between the oil extraction liquid level and the wellhead, the water density, the chloride ion content in water and the sulfate ion content in water;
the data analysis processing unit is used for drawing a graph of the first data changing along with time by taking time as an abscissa and the first data as an ordinate; performing curve fitting on the curve graph, and analyzing whether the curve graph shows an ascending trend;
a judging unit for judging the result according to the data of the data analysis processing unit: if the first data all show an ascending trend and the second data all accord with a preset standard, judging that the oil well has oil well casing damage;
the acquisition unit is specifically used for acquiring the water density, the chloride ion content and the sulfate ion content of the oil well in the preset time period;
the method for obtaining the water density, the chloride ion content and the sulfate ion content of the oil well specifically comprises the following steps:
the acquisition unit is also used for acquiring the produced liquid of the oil well and detecting the liquid so as to obtain the performance index of the liquid;
the acquisition unit is also used for acquiring the distance between the oil extraction liquid level of the oil well and the wellhead in a preset time period;
the judging unit is specifically configured to determine the oil well casing loss if the graph is in an ascending trend and the second data meets a preset standard, and specifically includes:
when the first data accords with the ascending trend, the water density of the oil well, the chloride ion content in the water and the sulfate ion content in the water can be checked; when the chloride ion content in the water, the water density reduction rate and the sulfate ion content in the water rise values meet preset standards, the oil well sleeve damage can be known;
wherein the preset criteria include:
when the liquid production amount rises, the distance between the oil production liquid level and the wellhead is in a decreasing trend;
the reduction rate of the chloride ion content in the water is 49% -87%;
the water density reduction rate is 23% -29%;
the rising value of the sulfate ion content in the water is 10.7-13.8 times of the original stratum water content.
7. The device for judging oil well casing damage according to claim 6, wherein,
the device also comprises a display unit for displaying at least one of the data acquired by the acquisition unit, the graph and graph fitting result output by the data analysis and processing unit and the oil well casing damage judging result output by the judging unit.
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