CN110107276B - Casing design method and apparatus - Google Patents
Casing design method and apparatus Download PDFInfo
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- CN110107276B CN110107276B CN201810089525.5A CN201810089525A CN110107276B CN 110107276 B CN110107276 B CN 110107276B CN 201810089525 A CN201810089525 A CN 201810089525A CN 110107276 B CN110107276 B CN 110107276B
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/007—Measuring stresses in a pipe string or casing
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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
- E21B47/06—Measuring temperature or pressure
-
- 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
- E21B47/26—Storing data down-hole, e.g. in a memory or on a record carrier
Abstract
The invention provides a method and a device for designing a sleeve, wherein the method comprises the following steps: establishing a first reservoir-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of a target well; establishing a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region; performing inversion operation on the first reservoir-salt gypsum layer model according to the rock mechanics parameter and the ground stress parameter of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation; establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well; determining a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model. The invention solves the problem of casing damage in the environments of reservoir pressure reduction, stratum inclination and the like in the oil and gas exploitation process.
Description
Technical Field
The invention relates to the technical field of drilling engineering, in particular to a casing design method and a casing design device.
Background
The Tarim basin is the largest oil-gas-containing basin in China, and has great exploration and development potential. The single well yield in the pre-mountain area is the main production area of oil and gas in the Tarim basin. The oil and gas reservoir in front of the Tarim oil field is positioned at the lower part of the interlayer salt-paste layer with high temperature, high pressure and high creep property. Along with the exploitation of reservoir oil gas, the reservoir pressure gradually decreases, so that the stress of a casing (used for transmitting oil gas) in the interlayer salt-gypsum layer is influenced, the casing is deformed, and the casing is damaged due to the unbalanced stress at the interface of the reservoir and the interlayer salt-gypsum layer; in addition, the stratum is inclined (the inclination angle is 5-20 degrees), and the stratum with different inclination angles causes different stress of each part of the casing, and also causes the casing to deform and be damaged, thereby influencing the safety of a shaft and the smooth operation of oil and gas exploitation.
Disclosure of Invention
The invention provides a casing design method and a casing design device, which avoid the phenomenon that a casing is damaged due to the dip angle of a stratum and the pressure reduction of a reservoir in the oil and gas exploitation process.
The invention provides a casing design method in a first aspect, which comprises the following steps:
establishing a first reservoir-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of a target well, wherein the target well is an oil well or a gas well in the target area;
Establishing a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region;
performing inversion operation on the first reservoir-salt gypsum layer model according to the rock mechanical parameters and the ground stress parameters of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation;
establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well;
determining a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model.
Optionally, the method further includes:
obtaining the lithology description of the stratum of the target well according to the lithology analysis of the target well;
determining the stratigraphic layering condition of the target well according to the stratigraphic lithology description of the target well and the logging information of the target well;
the logging information of the target well is obtained by performing lithologic logging on the target well;
the logging information of the target well comprises: and the logging stratigraphic layering condition, the stratigraphic fluctuation condition and the stratigraphic dip angle of the target well.
Optionally, the logging data further includes: a downhole temperature of the target well;
the performing an inversion operation on the first reservoir-salt-gypsum layer model according to the rock mechanics parameters and the geostress parameters of the target well comprises:
determining a creep constitutive equation according to the formation lithology description of the target well, the rock mechanical parameters, the ground stress parameters and the downhole temperature;
and carrying out inversion operation on the first reservoir-salt and gypsum layer model according to the first reservoir-salt and gypsum layer model and the creep constitutive equation.
Optionally, the determining, according to the fourth reservoir-salt-gypsum layer model, the yield strength of the casing for use in the target zone comprises:
determining the stress magnitude of a reservoir-salt paste layer corresponding to the fourth reservoir-salt paste layer model;
determining a yield strength for the casing in the target area based on the stress magnitude; the magnitude of the yield strength is greater than the magnitude of the stress.
Optionally, the determining the stress level of the reservoir-salt gypsum layer corresponding to the fourth reservoir-salt gypsum layer model includes:
and determining the stress magnitude of the reservoir-salt gypsum layer according to the maximum pressure drop value of the reservoir-salt gypsum layer and the fourth reservoir-salt gypsum layer model.
Optionally, the ground stress parameters include: horizontal maximum ground stress, horizontal minimum ground stress, and vertical ground stress.
Optionally, the number of the target wells is multiple.
A second aspect of the present invention provides a casing designing apparatus comprising:
the first model building module is used for building a first reservoir-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of the target well, wherein the target well is an oil well or a gas well in the target area;
the second model building module is used for building a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region;
the third model building module is used for carrying out inversion operation on the first reservoir-salt-gypsum layer model according to the rock mechanical parameters and the ground stress parameters of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation;
a fourth model building module, configured to build a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well;
A determination module to determine a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model.
Optionally, the casing design apparatus further comprises:
and the acquisition module is used for acquiring the formation lithology description of the target well according to the lithology analysis of the target well.
And the second determination module is used for determining the stratum layering condition of the target well according to the stratum lithology description of the target well and the logging information of the target well.
The logging information of the target well is obtained by performing lithologic logging on the target well;
the logging information of the target well comprises: and the stratigraphic layering condition, the stratigraphic fluctuation condition and the stratigraphic dip angle of the target well.
Optionally, the logging information further includes: a downhole temperature of the target well.
Optionally, the third model building module is specifically configured to: determining a creep constitutive equation according to the formation lithology description of the target well, rock mechanical parameters, ground stress parameters and the underground temperature; and performing inversion operation on the first reservoir-salt gypsum layer model according to the first reservoir-salt gypsum layer model and the creep constitutive equation.
Optionally, the first determining module is specifically configured to: and determining the stress magnitude of the reservoir-salt gypsum layer corresponding to the fourth reservoir-salt gypsum layer model, and determining the stress magnitude of the reservoir-salt gypsum layer according to the maximum pressure drop value of the reservoir-salt gypsum layer and the fourth reservoir-salt gypsum layer model.
Optionally, the first determining module is specifically configured to: and determining the stress magnitude of the reservoir-salt gypsum layer according to the maximum pressure drop value of the reservoir-salt gypsum layer and the fourth reservoir-salt gypsum layer model.
Optionally, the ground stress parameters include: horizontal maximum ground stress, horizontal minimum ground stress, and vertical ground stress.
Optionally, the number of the target wells is multiple.
A third aspect of the present invention provides a casing designing apparatus comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes computer-executable instructions stored by the memory to cause the casing design apparatus to perform the casing design method described above.
A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement the above-described casing design method.
The invention provides a method and a device for designing a sleeve, wherein the method comprises the following steps: establishing a first reservoir-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of a target well; establishing a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region; performing inversion operation on the first reservoir-salt gypsum layer model according to the rock mechanics parameter and the ground stress parameter of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation; establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well; determining a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model. The casing design method provided by the invention solves the problem of casing damage in complex environments such as reservoir pressure reduction and stratum inclination in the oil and gas exploitation process.
Drawings
FIG. 1 is a first schematic flow chart of a casing design method according to the present invention;
FIG. 2 is a schematic representation of a first reservoir-salt-gypsum layer model provided by the present invention;
FIG. 3 is a schematic representation of a third reservoir-salt-gypsum layer model provided by the present invention;
FIG. 4 is a second schematic flow chart illustrating a casing design method according to the present invention;
FIG. 5 is a first schematic structural diagram of a casing design device according to the present invention;
FIG. 6 is a second schematic structural view of the casing design device according to the present invention;
fig. 7 is a schematic structural diagram of a casing design device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a first flow diagram of a casing design method provided by the present invention, and an execution main body of the flow of the method shown in fig. 1 may be a casing design device, and the casing design device may be implemented by any software and/or hardware. As shown in fig. 1, the method for designing a casing according to this embodiment may include:
s101, establishing a first reservoir stratum-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of the target well, wherein the target well is an oil well or a gas well in the target area.
During the process of producing oil or gas, the operator typically establishes a target production area in which one or more oil or gas wells are developed for production. In the process of mining, the rock compositions of the target wells are different along with the different depths of the target wells, so that stratum layers consisting of rocks with different properties are formed in the target wells, and because of the different mechanical properties of the rocks, the stratum layers in the target wells are not orderly and parallel to each other, the thicknesses of different stratum rocks are different, and therefore the fluctuation of the stratum is formed.
The stratigraphic layering condition and the stratigraphic fluctuation condition of the target well can be obtained in the process of lithology logging by an operator, and the lithology logging is that the operator observes and analyzes the distribution of the rock stratum underground, so that the rock stratigraphic section of the target well can be established, and the stratigraphic layering condition of the target well can be obtained. And after the stratum layering condition of the target well is obtained, determining the stratum fluctuation condition according to the stratum layering conditions of a plurality of wells in the target area. The specific mode can be as follows: fig. 2 is a schematic diagram of a first reservoir-salt-gypsum layer model provided by the present invention, and as shown in fig. 2, if a well a is a mudstone layer from the bottom surface to 1000m below the ground surface, a well B is a mudstone layer from the bottom surface to 500m below the ground surface, and a well C is a mudstone layer from the bottom surface to 200m below the ground surface, the fluctuation of the formation can be determined according to different stratifying conditions of the formation. In this embodiment, the method is taken as an example, and the formation fluctuation condition may also be determined in other manners, which is not limited in this embodiment.
And obtaining the stratigraphic layering condition and the stratigraphic fluctuation condition of the target well, and establishing a first reservoir-salt gypsum layer model of the target area according to the specific condition in the target well in the target area, wherein the first reservoir-salt gypsum layer model is a predicted geometric model of the reservoir-salt gypsum layer of the target area. As shown in particular in fig. 2. Wherein, 1, argillite layer, 2, salt rock, 3, argillite containing, 4, salt rock, 5, argillite containing and argillite are the upper saline-gypsum layer studied in this embodiment, and have the characteristics of high temperature, high pressure, high creep and the like; 6. bottom sandstone, 7. chalk-based sandstone is a reservoir studied in this example below the upper salt-paste layer, in which reservoir oil and/or gas is to be produced.
The target well in this embodiment may be an oil or gas well, and the target area of study may be the area where the oil or gas well is located; the target well may be a plurality of oil or gas wells and the target area of interest may be the area in which the plurality of oil or gas wells are located. The casing design method provided by the present embodiments is applicable to one or more oil or gas wells.
S102, establishing a second reservoir-salt-gypsum layer model of the target area according to the actual geological structure and the actual fault distribution of the target area.
The actual geological structure of the target region may be obtained by performing geological structure research on the target region, and the actual geological structure may include: the relationship between the fold structure and the fracture structure of different stratum rocks and the relationship between the rock stratums can be, specifically, the relationship between the rock stratums can be, for example, the two rock stratums are parallel to each other, the contact surface is compact or the two rock stratums are separated, the contact surface is sparse, and the like.
The actual fault distribution of the target area can be obtained by seismic interpretation of the target area, the actual fault is caused by stress action among different strata rock, so that the strata are not continuous, the strata are broken, and the adjacent strata integrally move downwards or upwards relative to one stratum.
And acquiring the actual geological structure and the actual fault distribution of the target area, and establishing a second reservoir-salt gypsum layer model of the target area, wherein the second reservoir-salt gypsum layer model is a model of the reservoir-salt gypsum layer of the target area under the actual condition and contains stratum rock stress.
S103, performing inversion operation on the first reservoir stratum-salt gypsum layer model according to the rock mechanics parameters and the ground stress parameters of the target well; and establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after the inversion operation.
Obtaining a rock core for each stratum rock in a reservoir and a salt gypsum layer in a target well, processing the rock core into a standard rock sample indoors by adopting a dry sampling method according to international rock mechanics standards, and performing rock mechanics parameter experiments on the processed standard rock sample to obtain rock mechanics parameters of each stratum rock in the reservoir and the salt gypsum layer, wherein the rock mechanics parameters can comprise: elastic modulus, poisson's ratio, compressive strength, cohesion, internal friction angle, and the like. Further, stress-strain curves for each of the formation rocks in the reservoir and the salt-gypsum layers may be established using the rock mechanics parameters. In the process of oil and gas exploitation, stress among different stratum rocks is changed due to changes of reservoir pressure, and a stress-strain change curve of each stratum rock in a reservoir and a salt-gypsum layer can be obtained by using the rock mechanical parameters.
Performing a Kaiser effect crustal stress measurement experiment on a processed standard rock sample to obtain a crustal stress parameter of each stratum rock in a reservoir layer and a salt-gypsum layer, wherein the crustal stress parameter specifically comprises: horizontal maximum stress, horizontal minimum ground stress and vertical ground stress of the formation rock.
According to the rock mechanics parameter and the geostress parameter of the target well, the inversion operation of the first reservoir-salt gypsum layer model may be a simulated inversion operation of the geostress on the basis of the established first reservoir-salt gypsum layer model, and the specific implementation mode may be: applying the ground stress to each layer of formation rock in the established first reservoir-salt gypsum layer model, wherein the manner of applying the ground stress may be to gradually apply the ground stress parameter from small to large, or to apply the ground stress above and below the obtained ground stress parameter value of the formation rock, and the manner of applying the ground stress is not limited in this embodiment.
With the application of the ground stress, the stratum rocks in the first reservoir-salt gypsum layer model deform due to the stress action between the rock layers until the conditions of folds, fractures and the like generated by the rock layers and the conditions of folds, fractures and the like between the stratum rocks in the second reservoir-salt gypsum layer model are similar to or identical to those of the second reservoir-salt gypsum layer model. And establishing a third reservoir-salt gypsum layer model of the target area according to the stress value applied to the first reservoir-salt gypsum layer model at the moment and the folding, fracture and other conditions between the stratum rocks, wherein the third reservoir-salt gypsum layer model is a predicted reservoir-salt gypsum layer model with the stress action of the stratum rocks. Fig. 3 is a schematic diagram of a third reservoir-salt paste layer model provided by the present invention, and a specific schematic diagram of the third reservoir-salt paste layer model can be shown in fig. 3.
And S104, establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well.
And obtaining the stratum layering condition and the stratum fluctuation condition in the target area to obtain the dip angle of the stratum. The specific mode can be as follows: as shown in fig. 2, if the well a is a mudstone layer at a position 1000m from the bottom to the ground, the well B is a mudstone layer at a position 500m from the bottom to the ground, and the well C is a mudstone layer at a position 200m from the bottom to the ground, the horizontal direction between the three target wells is taken as the abscissa, the vertical direction of the target well is taken as the ordinate, and the horizontal distance values between the three target wells and the depth values of the mudstone layer are plotted, so as to obtain the dip angle of the formation. In this embodiment, the method is taken as an example, and the dip angle of the formation may also be determined in other manners, which is not limited in this embodiment.
And establishing a fourth reservoir-salt and gypsum layer model of the target area according to the third reservoir-salt and gypsum layer model and the stratigraphic dip angle of the target well, wherein the fourth reservoir-salt and gypsum layer model is the reservoir-salt and gypsum layer model containing the stratigraphic dip angle parameter.
And S105, determining the yield strength of the casing used in the target area according to the fourth reservoir-salt-gypsum layer model.
The stress value in the reservoir-salt gypsum layer in the target well can be obtained according to the fourth reservoir-salt gypsum layer model, the stress-strain curve of each layer of stratum rock can be obtained according to the mechanical parameters of each layer of stratum rock, the pressure of the reservoir gradually decreases along with the exploitation of reservoir oil gas, the stress action between the stratum rocks is inevitably influenced, further the stratum rocks deform, the stratum rocks in the exploitation process of the reservoir oil gas can be obtained according to the deformation, further the stress of the stratum rocks is obtained, and as long as the yield strength of a casing in the oil gas well is greater than the stress of the stratum rocks, the casing can be ensured not to be damaged; the mining plan can also be carried out on the target area, the reduction value of the reservoir pressure after the mining period is finished is estimated, and then the stress value of the stratum rock is obtained, so that the yield strength of the casing in the oil-gas well is greater than the stress of the stratum rock after the mining period is finished, and the casing can be guaranteed not to be damaged in the mining process.
According to the casing design method provided by the embodiment, a first reservoir-salt-gypsum layer model of a target area is established according to the stratigraphic layering condition and the stratigraphic fluctuation condition of a target well; establishing a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region; performing inversion operation on the first reservoir-salt gypsum layer model according to the rock mechanics parameter and the ground stress parameter of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation; establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well; determining a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model. The casing design method provided by the invention considers complex conditions such as reservoir pressure reduction, formation dip angle and the like in the actual oil and gas exploitation process, selects the yield strength of the casing in advance, and effectively ensures that the casing is not damaged in the oil and gas exploitation process.
The following describes the casing design method provided by the present invention in detail with reference to fig. 4, and fig. 4 is a schematic flow chart ii of the casing design method provided by the present invention, as shown in fig. 4, the flow chart may include:
s201, establishing a first reservoir stratum-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of the target well, wherein the target well is an oil well or a gas well in the target area.
On the basis of the embodiment, in order to make the stratigraphic layering condition of the target well more accurate, the stratigraphic rocks of each layer of the target well can be sampled, lithology analysis is further performed, the lithology description of the target well is obtained, and the logging stratigraphic layering condition of the target well is determined according to the lithology description of the target well and the logging information of the target well. The logging information of the target well is obtained by performing lithologic logging on the target well; the logging information of the target well comprises: stratigraphic layering condition, stratigraphic relief condition, stratigraphic dip of target well. Specifically, the manner of obtaining the stratigraphic layering condition, the stratigraphic fluctuation condition and the stratigraphic dip angle of the target well by performing lithology logging on the target well is the same as that in the above embodiment.
S202, establishing a second reservoir-salt-gypsum layer model of the target area according to the actual geological structure and the actual fault distribution of the target area.
And S203, determining a creep constitutive equation according to the formation lithology description of the target well, the rock mechanical parameters, the ground stress parameters and the underground temperature.
The well log data may further include: the downhole temperature of the target well. In addition, the method for obtaining the downhole temperature of the target well is not particularly limited in this embodiment, and the downhole temperature of the target well may be obtained by using a temperature tester, a temperature sensor, or by using other methods.
Optionally, when the inversion operation is performed on the first reservoir stratum-salt gypsum layer model, the creep constitutive equation corresponding to each layer of formation rock may be determined according to the formation lithology description of the target well, the rock mechanics parameter, the ground stress parameter, and the downhole temperature.
And S204, performing inversion operation on the first reservoir-salt gypsum layer model according to the first reservoir-salt gypsum layer model and the creep constitutive equation, and establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after the inversion operation.
And performing an inversion operation on the first reservoir-salt gypsum layer model according to the first reservoir-salt gypsum layer model and the creep constitutive equation, wherein the specific manner of the inversion operation can refer to the relevant description in the above embodiment, which is not limited herein.
And S205, establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well.
And S206, determining the stress of the reservoir-salt paste layer according to the maximum pressure drop value of the reservoir-salt paste layer and the fourth reservoir-salt paste layer model.
Obtaining the maximum pressure drop value of the reservoir-salt gypsum layer, which can be a mining plan for a target area, predicting the mining period of the target area, predicting the maximum pressure drop value of the reservoir pressure after the mining period is finished, determining the stress magnitude of the reservoir-salt gypsum layer according to a fourth reservoir-salt gypsum layer model, specifically according to the relation between stress strains in the fourth reservoir-salt gypsum layer model, wherein the stress magnitude of the reservoir-salt gypsum layer is caused by the stress action change between stratum rocks due to the reduction of the reservoir pressure.
S207, determining the yield strength of the sleeve used in the target area according to the stress; the magnitude of the yield strength is greater than the magnitude of the stress.
And determining the stress value of the stress of the reservoir-salt paste layer after the exploitation period is finished, so that the yield strength of the casing in the oil-gas well is greater than the stress value of the reservoir-salt paste layer after the exploitation period is finished, and the casing can be prevented from being damaged in the exploitation process.
The specific implementation processes of S201, S202, S204, and S205 may refer to the relevant descriptions in the foregoing embodiments, and are not described herein again.
In the embodiment, the stress of the reservoir-salt-gypsum layer is determined by predicting the reservoir pressure after the production period of the oil well or the gas well is ended, and the yield strength of the casing correspondingly selected and applied to the target well is larger than the stress of the reservoir-salt-gypsum layer, so that the phenomenon that the casing is damaged in the production process is further avoided.
Fig. 5 is a schematic structural diagram of a casing designing apparatus provided by the present invention, and as shown in fig. 5, the casing designing apparatus 300 provided by the present invention includes: a first model building module 301, a second model building module 302, a third model building module 303, a fourth model building module 304 and a first determining module 305.
The first model building module 301 is configured to build a first reservoir-salt-gypsum layer model of a target region according to a stratigraphic layering condition and a stratigraphic fluctuation condition of the target well, where the target well is an oil well or a gas well in the target region.
The second model building module 302 is configured to build a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region.
The third model building module 303 is used for performing inversion operation on the first reservoir-salt gypsum layer model according to the rock mechanics parameter and the ground stress parameter of the target well; and establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation.
And a fourth model building module 304, configured to build a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well.
A first determination module 305 for determining a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model.
Fig. 6 is a schematic structural diagram of a second casing designing device provided by the present invention, and as shown in fig. 6, the casing designing device 300 of this embodiment further includes, on the basis of the embodiment shown in fig. 5: an obtaining module 306 and a second determining module 307.
And an obtaining module 306, configured to obtain a lithology description of the formation of the target well according to the lithology analysis of the target well.
The second determining module 307 is configured to determine the stratigraphic layering condition of the target well according to the stratigraphic lithology description of the target well and the logging information of the target well.
The logging information of the target well is obtained by performing lithology logging on the target well.
The logging information of the target well comprises: and logging stratigraphic layering condition, stratigraphic fluctuation condition and stratigraphic dip angle of the target well.
Optionally, the logging information further comprises: the downhole temperature of the target well.
Optionally, the third model establishing module 303 is specifically configured to: determining a creep constitutive equation according to the formation lithology description of the target well, rock mechanical parameters, ground stress parameters and the underground temperature; and performing inversion operation on the first reservoir-salt gypsum layer model according to the first reservoir-salt gypsum layer model and the creep constitutive equation.
Optionally, the first determining module 305 is specifically configured to: and determining the stress magnitude of the reservoir-salt gypsum layer corresponding to the fourth reservoir-salt gypsum layer model, and determining the stress magnitude of the reservoir-salt gypsum layer according to the maximum pressure drop value of the reservoir-salt gypsum layer and the fourth reservoir-salt gypsum layer model.
Optionally, the first determining module 305 is specifically configured to: and determining the stress magnitude of the reservoir-salt gypsum layer according to the maximum pressure drop value of the reservoir-salt gypsum layer and the fourth reservoir-salt gypsum layer model.
Optionally, the ground stress parameters include: horizontal maximum ground stress, horizontal minimum ground stress, and vertical ground stress.
Optionally, the number of the target wells is multiple. Fig. 7 is a schematic structural diagram of a third casing design device provided in the present invention, and as shown in fig. 7, the casing design device may be, for example, a terminal device, such as a smart phone, a tablet computer, a computer, and the like. The casing design apparatus 400 includes: a memory 401 and at least one processor 402.
A memory 401 for storing program instructions.
The processor 402 is configured to implement the method for processing an unread message in this embodiment when the program instructions are executed, and the specific implementation principle may refer to the foregoing embodiment, which is not described herein again.
The cannula design apparatus may also include an input/output interface 403.
The input/output interface 403 may include a separate output interface and input interface, or may be an integrated interface that integrates input and output. The output interface is used for outputting data, the input interface is used for acquiring input data, the output data is a general name output in the method embodiment, and the input data is a general name input in the method embodiment.
The present invention also provides a readable storage medium, in which an execution instruction is stored, and when the execution instruction is executed by at least one processor of the casing design device, the casing design method in the above embodiment is realized when the execution instruction is executed by the processor.
The present invention also provides a program product comprising executable instructions stored on a readable storage medium. The at least one processor of the casing design apparatus may read the executable instructions from the readable storage medium, and the execution of the executable instructions by the at least one processor causes the casing design apparatus to implement the casing design methods provided by the various embodiments described above.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer-readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the foregoing embodiments of the network device or the terminal device, it should be understood that the Processor may be a Central Processing Unit (CPU), or may be other general-purpose processors, Digital Signal Processors (DSP), Application Specific Integrated Circuits (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules in the processor.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method of designing a casing, comprising:
establishing a first reservoir-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of a target well, wherein the target well is an oil well or a gas well in the target area, and the number of the target wells is multiple;
Establishing a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region;
performing inversion operation on the first reservoir-salt gypsum layer model according to the rock mechanical parameters and the ground stress parameters of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation;
establishing a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well;
determining a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model;
said determining a yield strength for a casing in the target zone according to the fourth reservoir-salt-gypsum layer model, comprising:
determining the stress magnitude of a reservoir-salt gypsum layer corresponding to the fourth reservoir-salt gypsum layer model;
determining a yield strength for the casing in the target area based on the stress magnitude; the magnitude of the yield strength is greater than the magnitude of the stress.
2. The method of claim 1, further comprising:
Acquiring a stratum lithology description of the target well according to the lithology analysis of the target well;
determining the logging stratum layering condition of the target well according to the stratum lithology description of the target well and the logging information of the target well;
the logging information of the target well is obtained by performing lithologic logging on the target well;
the logging information of the target well comprises: and the stratigraphic layering condition, the stratigraphic fluctuation condition and the stratigraphic dip angle of the target well.
3. The method of claim 2, wherein the well log data further comprises: a downhole temperature of the target well;
the performing an inversion operation on the first reservoir-salt-gypsum layer model according to the rock mechanics parameters and the ground stress parameters of the target well comprises:
determining a creep constitutive equation according to the formation lithology description of the target well, the rock mechanical parameters, the ground stress parameters and the downhole temperature;
and carrying out inversion operation on the first reservoir-salt and gypsum layer model according to the first reservoir-salt and gypsum layer model and the creep constitutive equation.
4. The method of claim 1, wherein determining the stress level of the reservoir-salt-gypsum layer corresponding to the fourth reservoir-salt-gypsum layer model comprises:
And determining the stress magnitude of the reservoir-salt gypsum layer according to the maximum pressure drop value of the reservoir-salt gypsum layer and the fourth reservoir-salt gypsum layer model.
5. The method of any one of claims 1-4, wherein the ground stress parameters comprise: horizontal maximum ground stress, horizontal minimum ground stress, and vertical ground stress.
6. A casing design apparatus, comprising:
the first model building module is used for building a first reservoir-salt-gypsum layer model of a target area according to the stratigraphic layering condition and the stratigraphic fluctuation condition of a target well, wherein the target well is an oil well or a gas well in the target area, and the number of the target wells is multiple;
the second model building module is used for building a second reservoir-salt-gypsum layer model of the target region according to the actual geological structure and the actual fault distribution of the target region;
the third model building module is used for carrying out inversion operation on the first reservoir-salt-gypsum layer model according to the rock mechanical parameters and the ground stress parameters of the target well; establishing a third reservoir-salt gypsum layer model of the target area according to the first reservoir-salt gypsum layer model and the second reservoir-salt gypsum layer model after inversion operation;
A fourth model building module, configured to build a fourth reservoir-salt-gypsum layer model of the target area according to the third reservoir-salt-gypsum layer model and the stratigraphic dip angle of the target well;
a determination module to determine a yield strength for the casing in the target zone according to the fourth reservoir-salt-gypsum layer model;
the determining module is further configured to determine a stress magnitude of a reservoir-salt paste layer corresponding to the fourth reservoir-salt paste layer model; determining a yield strength for the casing in the target zone based on the stress magnitude; the magnitude of the yield strength is greater than the magnitude of the stress.
7. A casing design apparatus, characterized in that the casing design apparatus comprises: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the cannula design apparatus to perform the method of any of claims 1-5.
8. A computer-readable storage medium having computer-executable instructions stored thereon which, when executed by a processor, implement the method of any one of claims 1-5.
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| US7200539B2 (en) * | 2001-02-21 | 2007-04-03 | Baker Hughes Incorporated | Method of predicting the on-set of formation solid production in high-rate perforated and open hole gas wells |
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| CN101936157B (en) * | 2010-08-19 | 2013-06-05 | 中国石油大学(北京) | Method for detecting pore pressure of high pressure saltwater layer by using log information |
| CN103195374B (en) * | 2013-03-27 | 2014-10-22 | 西南石油大学 | Method for designing salt rock stratum irregular-shaped sleeve |
| CN105089654A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气股份有限公司 | Evaporite bed casing determining method considering interlayer characteristics |
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| US5199489A (en) * | 1989-12-01 | 1993-04-06 | Dowell Schlumberger Incorporated | Method of cementing well casing to avoid gas channelling from shallow gas-bearing formations |
| CN102747289A (en) * | 2012-05-31 | 2012-10-24 | 宝山钢铁股份有限公司 | Ultrahigh-strength steel used for petroleum casing pipe, petroleum casing pipe, and manufacturing method thereof |
| CN106321082A (en) * | 2015-07-01 | 2017-01-11 | 中国石油化工股份有限公司 | Method and system for obtaining maximum external casing load of salt gypsum rock stratum |
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