CN111476406A - Oil-water well casing damage early warning method and device and storage medium - Google Patents

Oil-water well casing damage early warning method and device and storage medium Download PDF

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CN111476406A
CN111476406A CN202010216287.7A CN202010216287A CN111476406A CN 111476406 A CN111476406 A CN 111476406A CN 202010216287 A CN202010216287 A CN 202010216287A CN 111476406 A CN111476406 A CN 111476406A
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卢继源
张淑娟
朱丽红
杜庆龙
罗庆
杨冰冰
王又春
孙天元
刘庆红
陆蔚刚
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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Abstract

The invention discloses an oil-water well casing damage early warning method, an oil-water well casing damage early warning device and a storage medium, wherein the oil-water well casing damage early warning method comprises the following steps: determining an early warning index of casing damage of the oil-water well; determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well; and determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree, and carrying out casing damage early warning of the oil-water well based on the risk grade. The method solves the problems that the existing method is poor in operability and cannot meet the actual production requirement, and the problems that an oil field lacks an accurate, quantitative and rapid single-well casing damage risk evaluation method, is not beneficial to targeted risk regulation and control, and cannot reduce the number of casing damage wells.

Description

Oil-water well casing damage early warning method and device and storage medium
Technical Field
The invention relates to the field of oil field casing damage prevention, in particular to an oil-water well casing damage early warning method, an oil-water well casing damage early warning device and a storage medium.
Background
With the increase of development age, most of sand (gravel) rock oil fields developed by water injection in China enter an ultrahigh water content development period, the well pattern density is larger and larger, the pressure difference between layers and in the layers is larger and larger, the underground situation is more and more complex, in addition, the underground process condition is worse, the self aging of a casing pipe and other influences are caused, the number of casing damage wells of the oil field is increased year by year, the casing damage situation is more and more severe, and the normal production and development benefits of the oil field are seriously influenced. In order to control the casing loss situation, an accurate, rapid and quantitative oil-water well casing loss early warning method is needed, so that the casing loss risk is found in time, the risk index is quantitatively adjusted, the casing loss hidden danger is eliminated, and the casing loss is reduced.
Some research works on casing damage risk evaluation and prediction in China are reported in literature, see (1) extensive-phase, ludwig, "applied gradient boosting decision tree algorithm to predict casing damage" (computer application, 38 th (S2) in 2018), (2) zhukang, royal xylol, etc., 'application research of bayesian neural network method in casing damage prediction "(geophysical progress, 33 rd and 3 rd in 2018), (3) zumeilingi, mugwei, etc.,' formation principal stress comprehensive calculation method and its application in casing damage prediction" (geophysical progress, 31 th and 3 th stages in 2016), (4) lukangshan, baiao, "IA-SVM model-based thermal production casing life prediction" (oil and gas reservoir evaluation and development, 8 th and 1 st in 2018), (5) Zhang jun, Liu, etc., "tower river casing damage prediction software research" (petroleum machinery, volume 41, stage 6 in 2013), (6) royal beauty, Zhoufan and the like, "fuzzy comprehensive judgment of casing damage of oil-water well" (inner Mongolia petrochemical engineering, stage 10 in 2011), (7) Zhouyanjun, Jiajianhong "new method research for predicting casing damage" (prospecting engineering (geotechnical drilling engineering, 2009 supplement). The method comprises the following steps that (1) a casing loss risk assessment algorithm model is constructed by adopting a nuclear gradient lifting decision tree algorithm, and the influence degree and probability distribution of each characteristic parameter on casing loss are obtained according to casing attribute parameters and mining layer section parameters, so that data and decision support are provided for site construction operation; (2) determining an optimal neural network structure through a Bayesian neural network model, predicting the casing loss of an oil-water well, considering that fault opening water guide caused by high-pressure water injection is a leading factor causing regional casing loss, and adopting measures of improving well cementation quality, selecting reasonable water injection pressure and the like to prevent; (3) comprehensively utilizing various well data information to establish a stratum principal stress calculation method, and identifying a risk well region according to each pressure parameter distribution chart; (4) establishing a casing service life prediction model based on an Immune Algorithm (IA) optimization Support Vector Machine (SVM), and predicting the service life of the casing of the thermal production well of the Liaohe oil field by considering geological and engineering factors influencing casing damage; (5) considering that oil extraction parameters are main factors influencing casing loss of an ultra-deep reservoir, and determining the critical liquid level of the ultra-deep reservoir; (6) quantitatively calculating the weight of each influence factor by adopting a hierarchical analysis method, and carrying out casing damage risk identification on the fault block low-permeability oil reservoir semi-quantitatively by a fuzzy comprehensive evaluation method; (7) and establishing a support vector machine forecasting model, judging whether the casing damage exists or not, and forecasting the casing pipe condition.
The factors considered in the documents (1), (2), (4) and (5) are not comprehensive enough, the casing loss is the result of the multi-factor comprehensive action, under the conditions of unclear cleaning and unknown influence degree of various factors, some factors are removed artificially and subjectively, and the deduced conclusion may have a larger error with the actual result; in addition, documents (1) - (7) cannot give reasonable control limits of single well indexes and influence weights of various factors, cannot give specific casing damage risk indexes of oil-water wells, overproof risk degrees and risk sequencing, and cannot provide targeted regulation and control targets and countermeasures for production. Therefore, the method has limitations and poor operability, and cannot meet the actual production requirements, so that the method for early warning the casing damage of the oil-water well is invented, the relation between each index and the casing damage rate is researched by using historical dynamic and static data of oil field development, the casing damage risk of a single well is comprehensively and accurately evaluated, the casing damage risk grade is quantitatively divided, the risk sequence of each index is determined, the field is guided to determine the regulation and control target and the countermeasure, the risk index is timely regulated and controlled, the casing damage hidden danger is eliminated, and the target of reducing the casing damage occurrence probability fundamentally is realized.
Disclosure of Invention
In view of the above, the invention provides an oil-water well casing damage early warning method, an oil-water well casing damage early warning device and a storage medium, so as to solve the problems that the existing method is poor in operability and cannot meet the actual production requirement, and the problems that an oil field lacks an accurate, quantitative and rapid single-well casing damage risk evaluation method, is not beneficial to targeted risk regulation and control, and cannot reduce the number of casing damage wells.
In a first aspect, the invention provides an oil-water well casing damage early warning method, which comprises the following steps:
determining an early warning index of casing damage of the oil-water well;
determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well;
and determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree, and carrying out casing damage early warning of the oil-water well based on the risk grade.
Preferably, the oil-water well casing damage early warning index includes: the well cementation quality between a perforation point and a breakpoint of the oil-water well, drilling meeting breakpoints, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change;
and/or the presence of a gas in the interior of the container,
the method for determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well comprises the following steps:
determining the weight of the oil-water well casing damage early warning index and the accumulated casing damage risk degree;
determining the comprehensive risk degree of the casing loss according to the weight and the accumulated casing loss risk degree;
and/or the presence of a gas in the interior of the container,
the method for determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree comprises the following steps:
determining a first threshold value and a second threshold value;
and determining the risk grade of the oil-water well according to the first threshold, the second threshold and the casing damage comprehensive risk degree.
Preferably, the method for determining the weight of the oil-water well casing damage early warning index comprises the following steps:
determining an initial weight, a weight lower limit and a weight upper limit of the oil-water well casing damage early warning index;
optimizing the initial weight to obtain the weight of the oil-water well casing damage early warning index within the range of the weight lower limit and the weight upper limit;
and/or the presence of a gas in the interior of the container,
the method for determining the accumulated casing damage risk degree of the perforation point and the cementing quality between the breakpoint, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water volume change in the oil-water well casing damage early warning index comprises the following steps:
respectively determining a plurality of time point casing damage risk degrees of the amplitude exceeding the limit of each early warning index in the oil-water well casing damage early warning indexes;
determining the accumulated casing damage risk degree of each early warning index according to the casing damage risk degrees of the plurality of time points of each early warning index;
and/or the presence of a gas in the interior of the container,
and determining the accumulated casing damage risk degree of the drilling meeting breakpoint in the oil-water well casing damage early warning index as a set casing damage risk degree.
Preferably, the method for determining the limit of each early warning index includes:
acquiring the casing loss proportion of each early warning index;
determining a relation curve according to the early warning indexes and the casing loss proportion respectively;
determining the boundary of each early warning index according to the relation curve;
and/or the presence of a gas in the interior of the container,
the method for respectively determining the casing damage risk degrees of a plurality of time points of the amplitude exceeding the limit of each early warning index in the casing damage early warning indexes of the oil-water well comprises the following steps:
acquiring the casing damage risk degree of each early warning index, the boundary of each early warning index and a first quantitative expression of each early warning index;
determining the amplitude of exceeding the limit of each early warning index according to each early warning index and the limit of each early warning index;
obtaining a plurality of time point casing damage risk degrees of each early warning index according to the exceeding range of each early warning index and the first quantity expression;
and/or the presence of a gas in the interior of the container,
the method for determining the accumulated casing loss risk degree of each early warning index according to the casing loss risk degrees of the plurality of time points of each early warning index comprises the following steps:
acquiring the casing damage risk degree of a plurality of time points of each early warning index and a second quantitative expression;
respectively calculating the sum of the casing damage risk degrees of a plurality of time points of each early warning index;
and obtaining the accumulated casing damage risk degree of each early warning index according to the sum of the casing damage risk degrees of a plurality of time points of each early warning index and the second quantitative expression.
Preferably, the method for determining the limit of each early warning index according to the relationship curve includes: and the non-conductible points of the relation curve are the boundary of each early warning index.
In a second aspect, the invention provides an oil-water well casing damage early warning device, comprising:
the casing damage early warning index determining unit is used for determining a casing damage early warning index of the oil-water well;
the casing damage comprehensive risk degree determining unit is used for determining the casing damage comprehensive risk degree according to the casing damage early warning index of the oil-water well;
and the risk grade determining unit is used for determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree and carrying out casing damage early warning of the oil-water well based on the risk grade.
Preferably, the oil-water well casing damage early warning index includes: the well cementation quality between a perforation point and a breakpoint of the oil-water well, drilling meeting breakpoints, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change;
and/or the presence of a gas in the interior of the container,
the casing damage comprehensive risk degree determining unit comprises: a first determination unit and a second determination unit;
the first determining unit is used for determining the weight of the oil-water well casing loss early warning index and the accumulated casing loss risk degree;
the second determining unit is used for determining the comprehensive risk degree of the casing loss according to the weight and the accumulated risk degree of the casing loss;
and/or the presence of a gas in the interior of the container,
the risk level determination unit includes: a third determining unit and a fourth determining unit;
the third determining unit is used for determining a first threshold value and a second threshold value;
and the fourth determining unit is used for determining the risk level of the oil-water well according to the first threshold, the second threshold and the casing damage comprehensive risk degree.
Preferably, the first determination unit includes: a weight determination unit and/or an accumulated casing damage risk determination unit;
the weight determination unit includes: a weight setting unit and a weight optimizing unit;
the weight setting unit is used for determining an initial weight, a weight lower limit and a weight upper limit of the oil-water well casing damage early warning index;
the weight optimization unit is used for optimizing the initial weight to obtain the weight of the oil-water well casing damage early warning index within the range of the weight lower limit and the weight upper limit;
and/or the presence of a gas in the interior of the container,
the cumulative casing damage risk degree determination unit is used for determining the cumulative casing damage risk degree of the oil-water well casing damage early warning index, including the following steps: a first risk degree determination unit, a second risk degree determination unit and/or a third risk degree determination unit;
the first risk degree determining unit is used for respectively determining a plurality of time point casing loss risk degrees of the amplitude exceeding the limit of each early warning index in the oil-water well casing loss early warning indexes;
the second risk degree determination unit is used for determining the accumulated casing damage risk degree of each early warning index according to the casing damage risk degrees of the plurality of time points of each early warning index;
and/or the presence of a gas in the interior of the container,
and the third risk degree determining unit is used for determining the accumulated casing damage risk degree of the drilling meeting breakpoint in the oil-water well casing damage early warning index as the set casing damage risk degree.
Preferably, the first risk degree determination unit further includes: a boundary determination unit, the boundary determination unit comprising: the early warning system comprises a first acquisition unit, a relation curve determination unit and various early warning index limit determination units;
the first acquisition unit is used for acquiring the casing loss proportion of each early warning index;
the relation curve determining unit is used for determining a relation curve according to each early warning index and the casing loss proportion;
the early warning index limit determining unit is used for determining the limit of each early warning index according to the relation curve;
and/or the presence of a gas in the interior of the container,
the first risk level determination unit includes: the system comprises a second acquisition unit, an exceeding limit amplitude determination unit and a first risk degree production unit;
the second acquisition unit is used for acquiring the casing damage risk degree of each early warning index, the boundary of each early warning index and a first quantity expression of each early warning index;
the exceeding limit amplitude determining unit is used for determining the exceeding limit amplitude of each early warning index according to each early warning index and the limit of each early warning index;
the first risk degree production unit is used for obtaining a plurality of time point casing damage risk degrees of each early warning index according to the exceeding range of each early warning index and the first quantity expression;
and/or the presence of a gas in the interior of the container,
the second risk level determination unit includes: the system comprises a third acquisition unit, a sleeve damage risk sum calculation unit and a second risk production unit;
the third acquisition unit is used for acquiring the casing damage risk degrees of a plurality of time points of each early warning index and a second quantitative expression;
the casing loss risk degree sum calculating unit is used for calculating the casing loss risk degree sum of a plurality of time points of each early warning index respectively;
and the second risk degree production unit is used for obtaining the accumulated casing damage risk degree of each early warning index according to the sum of the casing damage risk degrees of the plurality of time points of each early warning index and the second quantitative expression.
In a third aspect, the present invention provides a storage medium comprising: a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to invoke the memory-stored instructions to perform the above-described method.
The invention has at least the following beneficial effects:
the invention provides an oil-water well casing damage early warning method, an oil-water well casing damage early warning device and a storage medium, which are used for solving the problems that the existing method is poor in operability and cannot meet the actual production requirement, and solving the problems that an oil field lacks an accurate, quantitative and rapid single-well casing damage risk evaluation method, is not beneficial to targeted risk regulation and control, and cannot reduce the number of casing damage wells. The invention can eliminate the sleeve damage hidden trouble and realize the target of reducing the sleeve damage occurrence probability radically.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of an early warning method for casing damage of an oil-water well according to an embodiment of the present invention;
FIG. 2 is a diagram of the relationship between the injection pressure exceeding the allowable injection pressure index and the casing damage ratio according to the embodiment of the present invention; in the figure, the oil pressure difference, namely the overpressure amplitude is the water injection pressure minus the allowable pressure;
FIG. 3 is a graph of the magnitude of the over-allowable injection pressure of the injection water in accordance with the embodiment of the present invention; in the figure, the oil pressure difference, namely the overpressure amplitude is the water injection pressure minus the allowable pressure;
FIG. 4 is a graph of the cumulative time of the injection pressure exceeding the allowable injection pressure and the casing damage ratio according to the embodiment of the present invention;
FIG. 5 is a relation between the risk degree R value and the casing damage rate of a water injection well of an oil production plant in the embodiment of the invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
The execution main body of the oil-water well casing damage early warning method provided by the embodiment of the present disclosure may be any image processing apparatus, for example, the oil-water well casing damage early warning method may be executed by a terminal device or a server, where the terminal device may be a User Equipment (UE), a mobile device, a User terminal, a cellular phone, a cordless phone, a Personal Digital Assistant (PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, or the like. The server may be a local server or a cloud server. In some possible implementation manners, the oil-water well casing damage early warning method can be realized by means of calling computer readable instructions stored in a memory by a processor.
Fig. 1 is a schematic flow chart of an oil-water well casing damage early warning method according to an embodiment of the invention. As shown in fig. 1, a casing damage early warning method for oil-water wells includes: step S101: determining an early warning index of casing damage of the oil-water well; step S102: determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well; step S103: and determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree, and carrying out casing damage early warning of the oil-water well based on the risk grade. The method solves the problems that the existing method is poor in operability and cannot meet the actual production requirement, and the problems that an oil field lacks an accurate, quantitative and rapid single-well casing damage risk evaluation method, is not beneficial to targeted risk regulation and control, and cannot reduce the number of casing damage wells. The invention can eliminate the sleeve damage hidden trouble and realize the target of reducing the sleeve damage occurrence probability radically.
Step S101: and determining the casing damage early warning index of the oil-water well.
In the invention, the oil-water well casing damage early warning index comprises the following steps: the well cementation quality between a perforation point and a breakpoint of the oil-water well, drilling meeting breakpoints, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change. Wherein, the drilling meeting breakpoint is not a necessary oil-water well casing damage early warning index of the invention.
Before determining the casing damage early warning index of the oil-water well, judging whether a drilling breakpoint exists or not; if the drilling-encountering breakpoint exists, the casing damage early warning indexes of the oil-water well comprise the drilling-encountering breakpoint, the well cementation quality between a perforation point and the breakpoint of the oil-water well, the formation inclination angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water quantity change. If do not exist and bore and meet the breakpoint, then oil-water well casing damage early warning index includes: the well cementation quality between the perforation point and the breakpoint of the oil-water well, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water quantity change.
In the embodiment of the invention, based on the recognition of geological, development and engineering factors influencing the casing damage of a single well, the five effects of strength effect, amplitude effect, cumulative effect, structural effect and hysteresis effect which cause the casing damage are considered, meanwhile, the characteristics of easy acquisition of production site indexes, strong operability and strong correlation are considered, the casing damage early warning index is designed, the index data stream is established, and the early warning indexes of 8 geological, development and engineering factors, namely the well cementation quality between the perforation point and the breakpoint of the oil-water well, the drilling meeting breakpoint, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water quantity change are determined through the cluster analysis and the correlation analysis of the ratio (casing damage ratio) of each index and the historical casing damage.
Wherein the formation dip angle may range from 0 to 90 °. The overpressure water injection is performed by injecting water at a pressure exceeding the allowable pressure. The change in oil pressure is calculated over the course of a month, i.e., the oil pressure in the current month minus the oil pressure in the previous month. The change of the cuff pressure is calculated by taking the month as time, such as subtracting the cuff pressure of the previous month from the cuff pressure of the current month. And (4) calculating the change of the water quantity by taking the month as time, such as subtracting the water quantity of the previous month from the water quantity of the current month.
Step S102: and determining the comprehensive risk degree of the casing damage according to the casing damage early warning index of the oil-water well.
In the invention, the method for determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well comprises the following steps: determining the weight of the oil-water well casing damage early warning index and the accumulated casing damage risk degree; and determining the comprehensive risk degree of the casing damage according to the weight and the accumulated risk degree of the casing damage.
In the invention, the method for determining the weight of the oil-water well casing damage early warning index comprises the following steps:
determining an initial weight, a weight lower limit and a weight upper limit of the oil-water well casing damage early warning index;
and optimizing the initial weight to obtain the weight of the oil-water well casing damage early warning index in the range of the weight lower limit and the weight upper limit.
In the embodiment of the invention, the weight coefficient determined by the relative influence degree of each early warning index on the historical casing damage well is used as the basis, and the weight of each early warning index is determined by adopting a method of obtaining the optimal weight through repeated iterative fitting. The method comprises the following specific steps:
firstly, normalization processing is carried out on the sleeve loss proportion (sleeve loss rate) of the history of abnormal early warning indexes, and the initial weight t of each risk index is determined0。
TABLE 1 initial weight of each early warning index
Figure BDA0002424552590000081
Different development stages have different development characteristics, which determine that the characteristics of index abnormity are different, so the influence degrees of development factors of different development stages on the casing loss are different, and therefore, in order to improve the prediction accuracy of casing loss risks in the future, the floating range [ t ] of the relative weight of each risk index is determined1,t2](ii) a Taking the water injection strength as an example, analyzing and discovering a casing damage concentrated region at the top section of a newly-added oil layer at present, when the water injection strength is too high, casing damage occurs to an oil-water well drilled in a sand body due to the pressure building in a single sand body because of the existence of reservoir heterogeneity, and the phenomenon that the liquid yield is increased because the water injection strength is improved in a high-water-content development period is sometimes caused, so that the influence weight of the water injection strength is increased within a certain reasonable range; for example, the oil pressure change, the oil pressure sampling device in wellhead equipment of a water injection well on a production site is the most perfect, and the evaluation rate of oil pressure fluctuation caused by abnormal indexes of the water injection well is higher and the potential sleeve loss hazard is larger at present, so the sleeve loss influence weight of the indexes is also properly improved; for another example, the casing pressure changes, and the casing pressure device on the oil field production site is very easy to block or freeze in winter and other seasons due to the fact that the casing pressure device is located at the tail end of the pipe flow, the pressure taking frequency is low, the data authenticity is low, and therefore the relative weight of the index is properly reduced.
TABLE 2 Floating Range of early warning index weights
Figure BDA0002424552590000082
Figure BDA0002424552590000091
Under the condition of initial weight, applying weight constraint conditions, performing gradual weight adjustment by using a computer within an allowable range, respectively calculating the fitting coincidence rate of each risk index under the weight, and selecting the result with the highest coincidence rate as the optimal weight.
TABLE 3 optimal weights for the early warning indicators
Figure BDA0002424552590000092
Therefore, the greater the degree of association between the index and the casing damage risk is, the higher the index weight is, namely, the greater the influence on the casing damage occurrence probability is; the over-allowable pressure water injection is most related to the single well casing damage, and the influence is also the greatest.
In the invention, the method for determining the accumulated casing damage risk degree of the perforation point and the inter-breakpoint well cementation quality, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water volume change in the casing damage early warning index of the oil-water well comprises the following steps: respectively determining a plurality of time point casing damage risk degrees of the amplitude exceeding the limit of each early warning index in the oil-water well casing damage early warning indexes; and determining the accumulated casing damage risk degree of each early warning index according to the casing damage risk degrees of the plurality of time points of each early warning index.
In the embodiment of the present invention, the overrun range is a relative value, and if the water injection pressure is 11Mpa, the allowable pressure is 10Mpa, and the overrun range is 1 Mpa.
In the invention, the accumulated casing damage risk degree of the drilling meeting breakpoint in the casing damage early warning index of the oil-water well is determined to be a set casing damage risk degree.
In an embodiment of the invention, the set cumulative casing damage risk of drilling a break point may be between 70-80, preferably 73.9.
In the invention, the method for respectively determining the casing damage risk degrees of a plurality of time points of the amplitude exceeding the limit of each early warning index in the casing damage early warning indexes of the oil-water well comprises the following steps:
acquiring the casing damage risk degree of each early warning index, the boundary of each early warning index and a first quantitative expression of each early warning index;
determining the amplitude of exceeding the limit of each early warning index according to each early warning index and the limit of each early warning index;
and obtaining a plurality of time point casing damage risk degrees of each early warning index according to the exceeding range of each early warning index and the first quantity expression.
In the embodiment of the invention, the calculation method of the casing damage risk degrees of a plurality of time points of the amplitude exceeding the limit of each early warning index in the casing damage early warning indexes of the oil-water well is described by taking calculation of the casing damage risk degree of one time point of overpressure water injection as an example.
FIG. 3 is a graph of the magnitude of the over-allowable injection pressure of the injection water in accordance with the embodiment of the present invention; in the figure, the oil admission pressure difference, i.e. the overpressure amplitude, is the water injection pressure minus the admission pressure. In the embodiment of the present invention and fig. 3, since the extent of the exceeding of the threshold of each indicator has different influence degrees on the casing damage risk, for example, the larger the extent of the exceeding of the allowable pressure of the injection water pressure of the oil production plant, the higher the probability of casing damage occurring, the exceeding of the threshold of each early warning indicator x must be compared with the historical casing damage risk riCarrying out regression analysis on the correlation, fitting a first quantitative expression between the correlation and the correlation, and taking a regression formula as the casing loss risk degree r of the index exceeding the limit rangeiThe relational expression (c) of (c). For example, a calculation formula (a first quantitative expression) of the casing loss risk degree of the early warning index monthly exceeding the limit of the overpressure water injection of the first plant:
ri＝3.986Ln(x)+31.753。
the out-of-limit amplitude of each early warning index is a relative value, namely the limit of each early warning index minus each early warning index. For example, if the water injection pressure is 11MPa, the allowable pressure is 10MPa, and the overrun range is 1 MPa.
Then, the amplitude exceeding the limit of each early warning index at a current time point can be substituted into a first quantity expression to obtain the casing damage risk degree of the time point, and then a plurality of time point casing damage risk degrees of each early warning index can be calculated. Wherein, the time point is generally measured in months.
In the present invention, the method for determining the cumulative casing loss risk of each early warning index according to the casing loss risk of a plurality of time points of each early warning index includes:
acquiring the casing damage risk degree of a plurality of time points of each early warning index and a second quantitative expression;
respectively calculating the sum of the casing damage risk degrees of a plurality of time points of each early warning index;
and obtaining the accumulated casing damage risk degree of each early warning index according to the sum of the casing damage risk degrees of a plurality of time points of each early warning index and the second quantitative expression.
FIG. 4 is a graph of the cumulative time of the water injection pressure exceeding the allowable injection pressure and the casing damage ratio according to the embodiment of the present invention. In the embodiment of the present invention and fig. 4, the cumulative casing loss risk is also referred to as a cumulative casing loss risk exceeding the threshold time length. According to the time length of a certain development index of a production well exceeding an index limit, the casing loss risk degree r of the past exceeding limit range of one index (taking the water injection pressure of an oil production plant as an example) is adoptediThe sum y is an independent variable, and the accumulated casing damage risk degree r of the time length is determined by the out-of-limit time in the total well number of each interval of the independent variablejFor dependent variables, regression equations were established. During evaluation, according to the casing loss risk r of the single well index actually exceeding the index limit for many timesiAnd summing the data to calculate the cumulative risk r of the index exceeding the limit in multiple periods of time for a single wellj(fig. 3), the calculation formula (second quantitative expression) of the accumulated casing damage risk degree such as water injection overpressure is:
rj＝15.696Ln(y)+50.198。
that is to say, after acquiring the casing loss risk degrees of the plurality of time points of each early warning index and the second quantitative expression of each early warning index, respectively calculating the sum of the casing loss risk degrees of the plurality of time points of each early warning index, and respectively obtaining the accumulated casing loss risk degree of each early warning index according to the sum of the casing loss risk degrees of the plurality of time points of each early warning index and the second quantitative expression.
In the present invention, the method for determining the limit of each early warning indicator includes: acquiring the casing loss proportion of each early warning index; determining a relation curve according to the early warning indexes and the casing loss proportion respectively; and determining the limit of each early warning index according to the relation curve.
In the present invention, the method for determining the limit of each early warning index according to the relationship curve comprises: and the non-conductible points of the relation curve are the boundary of each early warning index.
FIG. 2 is a graph of the injection pressure over-allowable injection pressure indicator versus casing loss rate according to an embodiment of the present invention. In the figure, the oil admission pressure difference, i.e. the overpressure amplitude, is the water injection pressure minus the admission pressure. In the embodiment of the present invention and fig. 2, according to the relation curve between each early warning indicator and the casing loss ratio (casing loss rate), "singular points" (non-conductive points) where the casing loss ratio (casing loss rate) suddenly increases are selected, and the point is determined as the boundary of the indicator early warning by combining with the conventional knowledge of casing loss prevention and control.
That is, if the oil-water well casing damage early warning index includes: the well cementation quality between the perforation point and the breakpoint of the oil-water well, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water quantity change. And (3) respectively calculating the relation curves of the perforating point of the oil-water well, the cementing quality between the breaking points, the formation inclination angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change, the water quantity change and the casing damage proportion (casing damage rate) of the oil-water well to obtain 7 relation curves. And respectively calculating the non-conductive points of the 7 relation curves to respectively obtain the boundaries of the early warning indexes of the perforation point and the breakpoint well cementation quality, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water quantity change of the water well.
Wherein, the drilling does not need to determine the boundary of index early warning and a plurality of time points of the amplitude exceeding the boundary to damage the risk degree.
In the present invention, the method for determining the comprehensive risk of casing loss according to the weight and the cumulative risk of casing loss comprises: and multiplying the cumulative casing damage risk degrees of the perforation points and the break points of the oil-water well, the drilling break points, the formation inclination angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water quantity change in the selected oil-water well casing damage early warning indexes by respective weights, and summing to obtain the comprehensive casing damage risk degree.
In the embodiment of the invention, the cumulative casing loss comprehensive risk degree R of the risk influence of multiple early warning indexes is obtained according to the cumulative casing loss risk degree and the index weight of each early warning index.
R＝∑rj·ti。
In the formula, R is the casing damage comprehensive risk degree of a single well; r isj-cumulative casing loss risk for a single pre-warning indicator; t is ti-weight of single pre-warning indicators. Wherein the risk degree of the accumulated casing damage of the drilling meeting breakpoint is 70-80, preferably 73.9; the single early warning index is one of the cementing quality between a perforation point and a breakpoint of the oil-water well, a drilling breakpoint, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change.
Step S103: and determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree, and carrying out casing damage early warning of the oil-water well based on the risk grade.
In the invention, the method for determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree comprises the following steps: determining a first threshold value and a second threshold value; and determining the risk grade of the oil-water well according to the first threshold, the second threshold and the casing damage comprehensive risk degree.
In an embodiment of the present invention, the first threshold may be 10, and the second threshold may be 20.
FIG. 5 is a relation between the risk degree R value and the casing damage rate of a water injection well of an oil production plant in the embodiment of the invention. In the embodiment of the invention and fig. 5, it is found through calculation of the comprehensive risk of casing loss of a single well of an oil production plant that the comprehensive risk value and the casing loss occurrence probability are in a positive correlation, and when the comprehensive risk of casing loss of the single well is greater than 20, the predicted casing loss proportion (casing loss rate) is greater than 50%; when the comprehensive risk degree of the casing damage is between 10 and 20, the predicted casing damage proportion (casing damage rate) is between 20 percent and 50 percent; and when the comprehensive risk degree of the casing damage is less than 10, the predicted casing damage proportion (casing damage rate) is less than 20%.
Table 4 actual casing damage ratio (casing damage ratio) table corresponding to comprehensive risk classification of single well of oil production plant
Evaluation results Casing damage well number (mouth) Total well number (mouth) Actual percentage of casing damage (%)
First degree risk 508 899 56.5
Second degree risk 857 2507 34.2
Third degree risk 699 4002 17.5
Total up to 2064 7408 27.9
In an embodiment of the present invention, the risk grade of the oil-water well is classified into 3 grades, i.e., a first grade, a second grade, and a third grade, according to the first threshold, the second threshold, and the casing damage comprehensive risk degree. When the risk grade is first grade, the predicted casing damage proportion (casing damage rate) is already more than 50 percent; when the risk grade is two grades, the predicted casing damage proportion (casing damage rate) is already between 20% and 50%; when the risk grade is three, the predicted casing damage ratio (casing damage rate) is already less than 20%.
TABLE 5 comprehensive risk classification standard for oil production plant
Ranking of integrated risk Comprehensive risk degree Predicted casing loss rate
First stage >20 >50％
Second stage (10,20] (20％,50％]
Three-stage (0,10] (0,20％]
Meanwhile, the invention also provides an oil-water well casing damage early warning device, which comprises: the casing damage early warning index determining unit is used for determining a casing damage early warning index of the oil-water well; the casing damage comprehensive risk degree determining unit is used for determining the casing damage comprehensive risk degree according to the casing damage early warning index of the oil-water well; and the risk grade determining unit is used for determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree and carrying out casing damage early warning of the oil-water well based on the risk grade. The method solves the problems that the existing method is poor in operability and cannot meet the actual production requirement, and the problems that an oil field lacks an accurate, quantitative and rapid single-well casing damage risk evaluation method, is not beneficial to targeted risk regulation and control, and cannot reduce the number of casing damage wells. The invention can eliminate the sleeve damage hidden trouble and realize the target of reducing the sleeve damage occurrence probability radically. The specific implementation steps and the method can be described in detail in an oil-water well casing damage early warning method.
In the device of the invention, the oil-water well casing damage early warning index comprises: the well cementation quality between a perforation point and a breakpoint of the oil-water well, drilling meeting breakpoints, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change.
In the apparatus of the present invention, the casing damage integrated risk level determination unit includes: a first determination unit and a second determination unit; the first determining unit is used for determining the weight of the oil-water well casing loss early warning index and the accumulated casing loss risk degree; and the second determining unit is used for determining the comprehensive risk degree of the casing damage according to the weight and the accumulated risk degree of the casing damage.
In the apparatus of the present invention, the risk level determination unit includes: a third determining unit and a fourth determining unit; the third determining unit is used for determining a first threshold value and a second threshold value; and the fourth determining unit is used for determining the risk level of the oil-water well according to the first threshold, the second threshold and the casing damage comprehensive risk degree.
In the apparatus of the present invention, the first determination unit includes: a weight determination unit and/or a cumulative casing loss risk determination unit.
In the apparatus of the present invention, the weight determination unit includes: a weight setting unit and a weight optimizing unit; the weight setting unit is used for determining an initial weight, a weight lower limit and a weight upper limit of the oil-water well casing damage early warning index; and the weight optimization unit is used for optimizing the initial weight to obtain the weight of the oil-water well casing damage early warning index within the range of the weight lower limit and the weight upper limit.
In the apparatus of the present invention, the cumulative casing damage risk determining unit is configured to determine the cumulative casing damage risk of the casing damage change and the water volume change in the oil-water well casing damage warning indicator, and includes: a first risk determination unit, a second risk determination unit and/or a third risk determination unit.
In the device, the first risk degree determining unit is used for respectively determining a plurality of time point casing damage risk degrees of the amplitude exceeding the limit of each early warning index in the oil-water well casing damage early warning indexes; and the second risk degree determining unit is used for determining the accumulated casing damage risk degree of each early warning index according to the casing damage risk degrees of the plurality of time points of each early warning index.
In the device, the third risk degree determining unit is configured to determine the accumulated casing damage risk degree of the drilling-encountering breakpoint in the oil-water well casing damage early warning index as a set casing damage risk degree.
In the apparatus of the present invention, the first risk level determination unit further includes: a boundary determination unit, the boundary determination unit comprising: the early warning system comprises a first acquisition unit, a relation curve determination unit and various early warning index limit determination units; the first acquisition unit is used for acquiring the casing loss proportion of each early warning index; the relation curve determining unit is used for determining a relation curve according to each early warning index and the casing loss proportion; and the early warning index limit determining unit is used for determining the limit of each early warning index according to the relation curve.
In the apparatus of the present invention, the first risk level determination unit includes: the system comprises a second acquisition unit, an exceeding limit amplitude determination unit and a first risk degree production unit; the second acquisition unit is used for acquiring the casing damage risk degree of each early warning index, the boundary of each early warning index and a first quantity expression of each early warning index;
the exceeding limit amplitude determining unit is used for determining the exceeding limit amplitude of each early warning index according to each early warning index and the limit of each early warning index; and the first risk degree production unit is used for obtaining a plurality of time point casing damage risk degrees of each early warning index according to the exceeding range of each early warning index and the first quantity expression.
In the apparatus of the present invention, the second risk level determination unit includes: the system comprises a third acquisition unit, a sleeve damage risk sum calculation unit and a second risk production unit; the third acquisition unit is used for acquiring the casing damage risk degrees of a plurality of time points of each early warning index and a second quantitative expression; the casing loss risk degree sum calculating unit is used for calculating the casing loss risk degree sum of a plurality of time points of each early warning index respectively; and the second risk degree production unit is used for obtaining the accumulated casing damage risk degree of each early warning index according to the sum of the casing damage risk degrees of the plurality of time points of each early warning index and the second quantitative expression.
In addition, the present invention also proposes a storage medium comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform the above-described method. The method solves the problems that the existing method is poor in operability and cannot meet the actual production requirement, and the problems that an oil field lacks an accurate, quantitative and rapid single-well casing damage risk evaluation method, is not beneficial to targeted risk regulation and control, and cannot reduce the number of casing damage wells. The invention can eliminate the sleeve damage hidden trouble and realize the target of reducing the sleeve damage occurrence probability radically. The specific implementation steps and the method can be described in detail in an oil-water well casing damage early warning method.
The method of the invention is adopted to carry out casing damage risk comprehensive evaluation on the water injection well without casing damage in an oil production plant, and the result shows that: the primary risk well has 205 ports, the secondary risk well has 588 ports, for the primary and secondary risk wells, the monitoring proportion is determined, monitoring strategies are determined according to the risk degree sequence and the risk types, and the detection of casing damage, leakage and the like is carried out; aiming at the existing dangerous wells, a targeted regulation and control strategy is made according to risk indexes, and orderly adjustment is carried out according to the sequence of the risk degrees.
Table 6 evaluation results of casing damage risk levels of development indexes of existing water injection wells of oil production plant
Figure BDA0002424552590000141
The whole process of the casing loss early warning method is specifically described through the examples, and the analysis result can be directly used for injection and production adjustment in the development process, so as to guide casing loss prevention and control work and reduce the casing loss occurrence probability. The present invention has the following features.
(1) Aiming at the determined single-index risk early warning limit, a method for determining optimal index weight by repeated iterative fitting is adopted, so that the prediction precision of the casing loss risk well in the future is improved, the accumulative influence of the amplitude of the multi-index exceeding limit and the time length of the exceeding limit on the casing loss is scientifically and accurately quantified, and the comprehensive quantitative evaluation of the single-index casing loss risk is realized.
(2) According to the casing damage risk level and the specific risk index of the single well, a targeted risk regulation and control measure is adopted, the casing damage risk is reduced, the number of wells with casing damage is reduced, and the adverse effects of the casing damage of the single well, particularly the centralized casing damage area, on the oil field yield, the development benefit, the environmental protection benefit and the like are reduced.
The method solves the problems that no scientific, accurate and timely comprehensive evaluation method for casing loss risks exists in an oil field production field, the targeted risk regulation and control is not facilitated, and the number of casing loss wells cannot be reduced, and meets the requirements of finding casing loss risks, targeted risk regulation and control in advance and reducing the number of casing loss wells in casing loss prevention and control work.
The implementation process of the method is illustrated by comprehensively evaluating and quantitatively dividing the casing damage risk of the Daqing oil field oil production plant into examples.
The accumulated casing damage rate of a Daqing oil field oil production plant reaches up to 39.9 percent, concentrated casing damage areas such as the west area and the east area of the south area appear successively in recent years, the number of wells to be treated in the casing damage areas is large, the treatment difficulty is high, the recovery cost is high, and great adverse effects are caused on the continuous stable production and the development benefits of the plant and even the Daqing oil field.
The invention is applied to an oil production plant with relatively serious casing damage in Daqing oil fields, and the result shows that: the method comprises the following steps that an oil production plant currently has a primary risk well 205 and a secondary risk well 588, provides specific risk index abnormal time and abnormal amplitude, provides a target value for risk index regulation and control, and provides powerful guidance for relieving the current unfavorable casing damage situation of the plant and improving the oil field development benefit; meanwhile, reference and guiding significance is provided for casing damage prevention and control work and sustainable development strategy of Daqing oil fields and even other similar oil fields in China.
The risk early warning limit of each single early warning index is determined, and management specifications are provided for daily production and development of the oil field; meanwhile, the relative influence degree of each factor on the casing damage risk is scientifically and accurately determined, and main development factors for casing damage formation are pointed out; on the basis of simultaneously considering the influence of abnormal amplitude of each index and the length of the out-of-limit time, the comprehensive risk degree of casing loss is calculated, the quantitative grading of the casing loss risk of the single well is realized, clear single well risk degree sequencing and index risk sequencing are provided for development and decision, an index early warning limit is taken as a regulation and control target, and a clear method and basis are provided for carrying out risk regulation and control in advance and reducing the occurrence probability of casing loss.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The early warning method for casing damage of the oil-water well is characterized by comprising the following steps:
determining an early warning index of casing damage of the oil-water well;
determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well;
and determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree, and carrying out casing damage early warning of the oil-water well based on the risk grade.
2. The method of claim 1, wherein:
oil-water well casing damage early warning index includes: the well cementation quality between a perforation point and a breakpoint of the oil-water well, drilling meeting breakpoints, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change;
and/or the presence of a gas in the interior of the container,
the method for determining the comprehensive risk degree of casing damage according to the casing damage early warning index of the oil-water well comprises the following steps:
determining the weight of the oil-water well casing damage early warning index and the accumulated casing damage risk degree;
determining the comprehensive risk degree of the casing loss according to the weight and the accumulated casing loss risk degree;
and/or the presence of a gas in the interior of the container,
the method for determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree comprises the following steps:
determining a first threshold value and a second threshold value;
and determining the risk grade of the oil-water well according to the first threshold, the second threshold and the casing damage comprehensive risk degree.
3. The method of claim 2, wherein:
the method for determining the weight of the oil-water well casing damage early warning index comprises the following steps:
determining an initial weight, a weight lower limit and a weight upper limit of the oil-water well casing damage early warning index;
optimizing the initial weight to obtain the weight of the oil-water well casing damage early warning index within the range of the weight lower limit and the weight upper limit;
and/or the presence of a gas in the interior of the container,
the method for determining the accumulated casing damage risk degree of the perforation point and the cementing quality between the breakpoint, the formation dip angle, the water injection strength, the overpressure water injection, the oil pressure change, the casing pressure change and the water volume change in the oil-water well casing damage early warning index comprises the following steps:
respectively determining a plurality of time point casing damage risk degrees of the amplitude exceeding the limit of each early warning index in the oil-water well casing damage early warning indexes;
determining the accumulated casing damage risk degree of each early warning index according to the casing damage risk degrees of the plurality of time points of each early warning index;
and/or the presence of a gas in the interior of the container,
and determining the accumulated casing damage risk degree of the drilling meeting breakpoint in the oil-water well casing damage early warning index as a set casing damage risk degree.
4. The method of claim 3, wherein:
the method for determining the boundary of each early warning index comprises the following steps:
acquiring the casing loss proportion of each early warning index;
determining a relation curve according to the early warning indexes and the casing loss proportion respectively;
determining the boundary of each early warning index according to the relation curve;
and/or the presence of a gas in the interior of the container,
the method for respectively determining the casing damage risk degrees of a plurality of time points of the amplitude exceeding the limit of each early warning index in the casing damage early warning indexes of the oil-water well comprises the following steps:
acquiring the casing damage risk degree of each early warning index, the boundary of each early warning index and a first quantitative expression of each early warning index;
determining the amplitude of exceeding the limit of each early warning index according to each early warning index and the limit of each early warning index;
obtaining a plurality of time point casing damage risk degrees of each early warning index according to the exceeding range of each early warning index and the first quantity expression;
and/or the presence of a gas in the interior of the container,
the method for determining the accumulated casing loss risk degree of each early warning index according to the casing loss risk degrees of the plurality of time points of each early warning index comprises the following steps:
acquiring the casing damage risk degree of a plurality of time points of each early warning index and a second quantitative expression;
respectively calculating the sum of the casing damage risk degrees of a plurality of time points of each early warning index;
and obtaining the accumulated casing damage risk degree of each early warning index according to the sum of the casing damage risk degrees of a plurality of time points of each early warning index and the second quantitative expression.
5. The method of claim 4, wherein the determining the bounds of each pre-warning indicator according to the relationship curve comprises: and the non-conductible points of the relation curve are the boundary of each early warning index.
6. The utility model provides an oil-water well casing damage early warning device which characterized in that includes:
the casing damage early warning index determining unit is used for determining a casing damage early warning index of the oil-water well;
the casing damage comprehensive risk degree determining unit is used for determining the casing damage comprehensive risk degree according to the casing damage early warning index of the oil-water well;
and the risk grade determining unit is used for determining the risk grade of the oil-water well according to the casing damage comprehensive risk degree and carrying out casing damage early warning of the oil-water well based on the risk grade.
7. The apparatus of claim 6, wherein:
oil-water well casing damage early warning index includes: the well cementation quality between a perforation point and a breakpoint of the oil-water well, drilling meeting breakpoints, a stratum inclination angle, water injection strength, overpressure water injection, oil pressure change, casing pressure change and water quantity change;
and/or the presence of a gas in the interior of the container,
the casing damage comprehensive risk degree determining unit comprises: a first determination unit and a second determination unit;
the first determining unit is used for determining the weight of the oil-water well casing loss early warning index and the accumulated casing loss risk degree;
the second determining unit is used for determining the comprehensive risk degree of the casing loss according to the weight and the accumulated risk degree of the casing loss;
and/or the presence of a gas in the interior of the container,
the risk level determination unit includes: a third determining unit and a fourth determining unit;
the third determining unit is used for determining a first threshold value and a second threshold value;
and the fourth determining unit is used for determining the risk level of the oil-water well according to the first threshold, the second threshold and the casing damage comprehensive risk degree.
8. The apparatus of claim 7, wherein the first determining unit comprises: a weight determination unit and/or an accumulated casing damage risk determination unit;
the weight determination unit includes: a weight setting unit and a weight optimizing unit;
the weight setting unit is used for determining an initial weight, a weight lower limit and a weight upper limit of the oil-water well casing damage early warning index;
the weight optimization unit is used for optimizing the initial weight to obtain the weight of the oil-water well casing damage early warning index within the range of the weight lower limit and the weight upper limit;
and/or the presence of a gas in the interior of the container,
the cumulative casing damage risk degree determination unit is used for determining the cumulative casing damage risk degree of the oil-water well casing damage early warning index, including the following steps: a first risk degree determination unit, a second risk degree determination unit and/or a third risk degree determination unit;
the first risk degree determining unit is used for respectively determining a plurality of time point casing loss risk degrees of the amplitude exceeding the limit of each early warning index in the oil-water well casing loss early warning indexes;
the second risk degree determination unit is used for determining the accumulated casing damage risk degree of each early warning index according to the casing damage risk degrees of the plurality of time points of each early warning index;
and/or the presence of a gas in the interior of the container,
and the third risk degree determining unit is used for determining the accumulated casing damage risk degree of the drilling meeting breakpoint in the oil-water well casing damage early warning index as the set casing damage risk degree.
9. The apparatus of claim 8, wherein:
the first risk level determination unit further includes: a boundary determination unit, the boundary determination unit comprising: the early warning system comprises a first acquisition unit, a relation curve determination unit and various early warning index limit determination units;
the first acquisition unit is used for acquiring the casing loss proportion of each early warning index;
the relation curve determining unit is used for determining a relation curve according to each early warning index and the casing loss proportion;
the early warning index limit determining unit is used for determining the limit of each early warning index according to the relation curve;
and/or the presence of a gas in the interior of the container,
the first risk level determination unit includes: the system comprises a second acquisition unit, an exceeding limit amplitude determination unit and a first risk degree production unit;
the second acquisition unit is used for acquiring the casing damage risk degree of each early warning index, the boundary of each early warning index and a first quantity expression of each early warning index;
the exceeding limit amplitude determining unit is used for determining the exceeding limit amplitude of each early warning index according to each early warning index and the limit of each early warning index;
the first risk degree production unit is used for obtaining a plurality of time point casing damage risk degrees of each early warning index according to the exceeding range of each early warning index and the first quantity expression;
and/or the presence of a gas in the interior of the container,
the second risk level determination unit includes: the system comprises a third acquisition unit, a sleeve damage risk sum calculation unit and a second risk production unit;
the third acquisition unit is used for acquiring the casing damage risk degrees of a plurality of time points of each early warning index and a second quantitative expression;
the casing loss risk degree sum calculating unit is used for calculating the casing loss risk degree sum of a plurality of time points of each early warning index respectively;
and the second risk degree production unit is used for obtaining the accumulated casing damage risk degree of each early warning index according to the sum of the casing damage risk degrees of the plurality of time points of each early warning index and the second quantitative expression.
10. A storage medium, comprising: a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to invoke the memory-stored instructions to perform the method of any of claims 1 to 5.
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