Method, device and equipment for determining external extrusion resistance value of sleeve and medium

Abstract

The invention discloses a method, device and equipment for determining the external extrusion resistance value of a casing and a medium, and relates to the technical field of engineering drilling, and the method comprises the steps: respectively calculating a casing damage risk coefficient and a casing damage weight based on casing damage parameters in a historical implementation well; determining a casing strength parameter, calculating the basic external extrusion strength of the casing based on the casing strength parameter, and calculating the casing damage risk value of the implementation well to be adjusted by using the casing damage weight and the basic external extrusion strength of the casing; based on the casing damage risk coefficient, the casing basic anti-external-extrusion strength and the casing damage risk value, the minimum casing anti-external-extrusion strength of the implementation well to be adjusted is calculated; and determining an actual casing pipe external extrusion resistance value of the to-be-adjusted implementation well based on the minimum casing pipe external extrusion resistance strength. According to the technical scheme, the external extrusion resistance of the production casing can be dynamically adjusted, so that the production requirements of new wells in different work areas are met, and long-period safe operation of the new wells is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of engineering drilling, and in particular to a method, a device, equipment and a medium for determining a casing anti-external collapse value. Background Art

[0002] At present, the design of the anti-external collapse strength of production casing generally adopts the equal safety method and triaxial stress verification method, and no in-depth research has been conducted on the interaction mechanism, deformation and stress distribution law of the multi-layer structure of casing-cement sheath-formation rock over time, and the distribution law of formation casing column load. However, some conventional new wells have experienced casing damage and the casing anti-external collapse strength at the damaged part is greater than the calculated value using the equal safety method and triaxial stress verification method, which shows that the anti-external collapse strength of production casing calculated only by the equal safety method and triaxial stress verification method cannot meet the production needs of new wells in different work areas.

[0003] As can be seen from the above, how to achieve dynamic adjustment of the anti-external collapse strength of the production casing to meet the production needs of new wells in different work areas and ensure the long-term safe operation of new wells is a problem to be solved in this field. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method, device, equipment and medium for determining the casing anti-collapse value, which can realize dynamic adjustment of the anti-collapse strength of the production casing, so as to meet the production needs of new wells in different work areas and ensure the long-term safe operation of new wells. The specific scheme is as follows:

[0005] In a first aspect, the present application discloses a method for determining a casing anti-external collapse value, comprising:

[0006] Calculate casing damage risk coefficient and casing damage weight respectively based on casing damage parameters in historical wells;

[0007] Determine casing strength parameters, calculate basic casing anti-collapse strength based on the casing strength parameters, and calculate casing damage risk value of the well to be adjusted using the casing damage weight and the basic casing anti-collapse strength;

[0008] Calculate the minimum casing anti-collapse strength of the well to be adjusted based on the casing damage risk coefficient, the basic casing anti-collapse strength and the casing damage risk value;

[0009] The actual casing collapse resistance value of the well to be adjusted is determined based on the minimum casing collapse resistance strength.

[0010] Optionally, the step of calculating the casing damage risk coefficient and the casing damage weight based on casing damage parameters in historical wells includes:

[0011] Calculating the casing damage risk coefficient based on the number of casing damage wells in the casing damage parameters and the number of implemented wells in the wells to be adjusted;

[0012] The casing damage weight is calculated based on the maximum service life of the casing in the casing damage parameters and a preset casing wear weight table.

[0013] Optionally, the calculating of the casing damage risk coefficient based on the number of casing damage wells in the casing damage parameters and the number of implemented wells in the wells to be adjusted includes:

[0014] The casing damage risk coefficient is calculated using a preset damage risk coefficient calculation formula, based on the number of casing damage wells in the casing damage parameter and the number of implemented wells in the wells to be adjusted; the damage risk coefficient calculation formula is:

[0015] α=N t / T;

[0016] Among them, N t is the number of casing damaged wells in the casing damage parameters, and T is the number of implemented wells in the wells to be adjusted.

[0017] Optionally, the calculating the casing damage weight based on the maximum service life of the casing in the casing damage parameter and a preset casing wear weight table includes:

[0018] The casing damage weight is calculated using a preset casing damage weight calculation formula and based on the maximum casing service life in the casing damage parameters and a preset casing wear weight table; the casing damage weight calculation formula is:

[0019]

[0020] Among them, μ max is the weight value of the casing in the first year of use, y is the service life of the casing, and y max is the maximum production life of casing, and k is the calculation coefficient.

[0021] Optionally, the determining of the casing strength parameter and the calculation of the casing basic anti-external collapse strength based on the casing strength parameter include:

[0022] Determine casing strength parameters; the casing strength parameters include the vertical depth of the production casing, the maximum formation pressure equivalent density of the target layer, and the casing anti-external collapse safety factor;

[0023] The basic anti-external collapse strength of the casing is calculated using the basic anti-external collapse strength calculation formula and based on the casing strength parameters; the basic anti-external collapse strength calculation formula of the casing is:

[0024] P=Hg ×ρ max ×S C ×G;

[0025] Among them, H g is the vertical depth of the production casing, ρ max is the maximum formation pressure equivalent density of the target layer, S C is the safety factor of the casing against external collapse, and G is the gravity constant.

[0026] Optionally, the calculating of the casing damage risk value of the well to be adjusted by using the casing damage weight and the basic anti-external collapse strength of the casing includes:

[0027] Based on a preset risk value calculation formula, the casing damage risk value of the well to be adjusted is calculated using the casing damage weight and the basic anti-external collapse strength of the casing; the risk value calculation formula is:

[0028]

[0029] Among them, P i is the basic anti-external collapse strength of the casing at the damaged part, μ is the casing damage weight, and μ i is the weight corresponding to the casing service life, μ max It is the weight value of the casing in the first year of use.

[0030] Optionally, the calculating the minimum casing collapse resistance of the well to be adjusted based on the casing damage risk coefficient, the basic casing collapse resistance and the casing damage risk value includes:

[0031] The minimum casing anti-external collapse strength of the well to be adjusted is calculated using a preset minimum casing anti-external collapse strength calculation formula, based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value; the minimum casing anti-external collapse strength calculation formula is:

[0032] P min =P+(α+1)×β;

[0033] Wherein, P is the basic anti-external collapse strength of the casing, β is the casing damage risk value, and α is the casing damage risk coefficient.

[0034] In a second aspect, the present application discloses a device for determining a casing anti-external collapse value, comprising:

[0035] A coefficient and weight calculation module, used to calculate the casing damage risk coefficient and casing damage weight respectively based on casing damage parameters in historical wells;

[0036] A strength and risk value calculation module, used to determine casing strength parameters, calculate basic casing anti-collapse strength based on the casing strength parameters, and calculate the casing damage risk value of the well to be adjusted using the casing damage weight and the basic casing anti-collapse strength;

[0037] A minimum anti-external collapse strength calculation module, used to calculate the minimum anti-external collapse strength of the casing of the well to be adjusted based on the casing damage risk coefficient, the basic anti-external collapse strength of the casing and the casing damage risk value;

[0038] The collapse value determination module is used to determine the actual casing collapse resistance value of the well to be adjusted based on the minimum casing collapse resistance strength.

[0039] In a third aspect, the present application discloses an electronic device, comprising:

[0040] Memory, used to store computer programs;

[0041] The processor is used to execute the computer program to implement the aforementioned method for determining the casing anti-external collapse value.

[0042] In a fourth aspect, the present application discloses a computer storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the steps of the aforementioned method for determining the casing anti-external collapse value are implemented.

[0043] It can be seen that the present application provides a method for determining the casing anti-external collapse value, including calculating the casing damage risk coefficient and the casing damage weight based on the casing damage parameters in the historical implementation wells; determining the casing strength parameters, calculating the basic casing anti-external collapse strength based on the casing strength parameters, and calculating the casing damage risk value of the implementation well to be adjusted using the casing damage weight and the basic casing anti-external collapse strength; calculating the minimum casing anti-external collapse strength of the implementation well to be adjusted based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value; and determining the actual casing anti-external collapse value of the implementation well to be adjusted based on the minimum casing anti-external collapse strength. The present application first calculates the casing damage risk coefficient, casing damage weight and basic casing anti-external collapse strength, and then calculates the casing damage risk value of the well to be adjusted based on the basic casing anti-external collapse strength and the casing damage weight. Finally, the minimum casing anti-external collapse strength of the well to be adjusted is comprehensively calculated based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value, so as to determine the actual casing anti-external collapse value of the well to be adjusted based on the minimum casing anti-external collapse strength, which can realize dynamic adjustment of the production casing anti-external collapse strength and obtain the minimum casing anti-external collapse strength, so as to scientifically and economically select the actual casing anti-external collapse value based on the minimum casing anti-external collapse strength, and can meet the production needs of new wells in different work areas and ensure the long-term safe operation of new wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0045] Figure 1 A flow chart of a method for determining a casing anti-external collapse value disclosed in the present application;

[0046] Figure 2 A schematic diagram of the structure of a casing anti-external collapse value determination device disclosed in the present application;

[0047] Figure 3 A structural diagram of an electronic device provided for this application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] At present, the design of the anti-external collapse strength of production casing generally adopts the equal safety method and the triaxial stress verification method, and no in-depth research has been conducted on the interaction mechanism, deformation and stress distribution law of the multi-layer structure of casing-cement sheath-formation rock over time, and the distribution law of the formation casing column load. However, some conventional new wells have experienced casing damage and the casing anti-external collapse strength at the damaged part is greater than the calculated value using the equal safety method and the triaxial stress verification method. This shows that the anti-external collapse strength of production casing calculated only by the equal safety method and the triaxial stress verification method cannot meet the production needs of new wells in different work areas. As can be seen from the above, how to achieve dynamic adjustment of the anti-external collapse strength of production casing to meet the production needs of new wells in different work areas and ensure the long-term safe operation of new wells is a problem to be solved in this field.

[0050] See also Figure 1 As shown, an embodiment of the present invention discloses a method for determining a casing anti-external collapse value, which may specifically include:

[0051] Step S11: Calculate the casing damage risk coefficient and casing damage weight based on the casing damage parameters in the historical implementation wells.

[0052] In this embodiment, the casing damage risk coefficient is calculated based on the number of casing damaged wells in the casing damage parameters and the number of implemented wells in the wells to be adjusted; the casing damage weight is calculated based on the maximum service life of the casing in the casing damage parameters and a preset casing wear weight table.

[0053] The casing damage risk coefficient is calculated by using a preset damage risk coefficient calculation formula, and based on the number of casing damage wells in the casing damage parameters and the number of implemented wells in the wells to be adjusted; the damage risk coefficient calculation formula is:

[0054] α=N t / T;

[0055] Among them, N t is the number of casing damaged wells in the casing damage parameters, T is the number of implemented wells in the wells to be adjusted, not less than 10, and the obtained value is rounded to 3 significant figures after the decimal point.

[0056] Calculating the casing damage weight: using a preset casing damage weight calculation formula, and based on the maximum casing service life in the casing damage parameters and a preset casing wear weight table, the casing damage weight is calculated; the casing damage weight calculation formula is:

[0057]

[0058] Among them, μ max is the weight value of the casing in the first year of use, ranging from 2 to 10, and 3 to 5 after optimization. y is the service life of the casing, y max is the maximum production life of the casing, k is the calculation coefficient, and the obtained value is rounded to 4 significant figures after the decimal point.

[0059] Step S12: Determine casing strength parameters, calculate basic casing collapse resistance based on the casing strength parameters, and calculate casing damage risk value of the well to be adjusted using the casing damage weight and the basic casing collapse resistance.

[0060] In this embodiment, the casing strength parameters are determined; the casing strength parameters include the vertical depth of the production casing, the maximum formation pressure equivalent density of the target layer, and the casing anti-external collapse safety factor; the basic casing anti-external collapse strength calculation formula is used and based on the casing strength parameters to calculate the basic casing anti-external collapse strength; the basic casing anti-external collapse strength calculation formula is:

[0061] P=H g ×ρ max ×S C ×G;

[0062] Among them, H g is the vertical depth of the production casing, ρ max is the maximum formation pressure equivalent density of the target layer, S C The casing anti-external collapse safety factor is 1.0, and G is the gravity constant 0.00981.

[0063] Then, based on the preset risk value calculation formula, the casing damage risk value of the well to be adjusted is calculated using the casing damage weight and the basic casing anti-external collapse strength; the risk value calculation formula is:

[0064]

[0065] Among them, P i is the basic anti-external collapse strength of the casing at the damaged part, μ is the casing damage weight, and μ i is the weight corresponding to the casing service life, μ max It is the weight value of the casing in the first year of use. The obtained value is rounded to 2 significant figures after the decimal point.

[0066] Step S13: Calculate the minimum casing collapse resistance of the well to be adjusted based on the casing damage risk coefficient, the basic casing collapse resistance and the casing damage risk value.

[0067] In this embodiment, the minimum casing anti-external collapse strength calculation formula is used, and the minimum casing anti-external collapse strength of the well to be adjusted is calculated based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value; the minimum casing anti-external collapse strength calculation formula is:

[0068] P min =P+(α+1)×β;

[0069] Wherein, P is the basic anti-external collapse strength of the casing, β is the casing damage risk value, α is the casing damage risk coefficient, and the obtained value is rounded to 4 significant figures after the decimal point.

[0070] Step S14: determining the actual casing collapse resistance value of the well to be adjusted based on the minimum casing collapse resistance strength.

[0071] In the first specific embodiment, a block injection well uses Φ139.7mm production casing for periodic injection and production, the target layer depth is 2560-2700m, and the maximum vertical depth of the target layer is H g is 2700m, the maximum formation pressure equivalent density of the target layer is ρ max 1.35g / cm 3 The situation of casing damaged wells in this block is shown in Table 1:

[0072] Table 1

[0073]

[0074]

[0075] The calculation results of the minimum anti-external collapse strength of casing damaged wells are shown in Table 2, where μ max =3,y max =20,μ i is the weight corresponding to the service life of the casing.

[0076] Table 2

[0077]

[0078] Comparing the casing anti-external collapse strength calculated by the equal safety method and the triaxial stress verification method, the minimum value of the casing anti-external collapse strength calculated by the equal safety method and the triaxial stress verification method is 35.76MPa. Based on the existing casing situation, but referring to the minimum value of the casing anti-external collapse strength of the newly designed wells finally calculated by the traditional method, the optimal result of the production casing of the newly designed wells will be the casing with an anti-external collapse strength of 43.4MPa (outer diameter Φ139.7mm, steel grade N80, wall thickness 7.72mm). The anti-external collapse strength of the wells with casing damage in this block is greater than or equal to 43.4MPa. If the casing with an anti-external collapse strength of 43.4MPa is selected, there will inevitably be a higher risk of casing damage. The dynamic method is used to calculate that the minimum value of the casing anti-external collapse strength in year X is 67.94MPa. At this time, it can be considered that the casing anti-external collapse strength of the newly added wells should be higher than 67.94MPa. The minimum casing collapse strength in X+3 is 78.23MPa. At this time, it can be considered that the casing collapse strength of newly added wells should be higher than 78.23MPa. Similarly, the casing collapse strength of newly added wells in the block can be dynamically adjusted to reduce the number of casing damaged wells in the later period and meet the safe, efficient and economical production requirements of the oil field.

[0079] In addition, the method for calculating the coefficient k is: Assuming that the maximum service life of the casing is y max For 20 years, μ max is 3, and after 20 years, μ is 0 and the casing is damaged, so k is 8.611. At the same time, the wear weight table of different years is obtained, as shown in Table 3. The obtained values ​​are rounded to 4 significant figures after the decimal point.

[0080] Table 3

[0081]

[0082]

[0083] In the second specific embodiment, a block injection well adopts Φ139.7mm production layer casing for periodic injection and production, the target layer depth is 2500-2600m, and the maximum vertical depth of the target layer is H g is 2600m, the maximum formation pressure equivalent density of the target layer is ρ max 1.15g / cm 3 The situation of casing damaged wells in this block is shown in Table 4:

[0084] Table 4

[0085]

[0086] The calculation results of the minimum anti-external collapse strength of casing damaged wells are shown in Table 5, where μ max =3,y max =20.

[0087] Table 5

[0088]

[0089] Comparing the casing anti-external collapse strength calculated by the equal safety method and the triaxial stress verification method, the minimum value of the casing anti-external collapse strength calculated by the equal safety method and the triaxial stress verification method is 29.33MPa. Based on the existing casing situation, but referring to the minimum value of the casing anti-external collapse strength of the newly designed wells finally calculated by the traditional method, the optimal result of the production casing of the newly designed wells will be the casing with an anti-external collapse strength of 33.9MPa (outer diameter Φ139.7mm, steel grade J55, wall thickness 7.72mm). The anti-external collapse strength of the wells with casing damage in this block is greater than or equal to 33.9MPa. If the casing with an anti-external collapse strength of 33.9MPa is selected, there will inevitably be a higher risk of casing damage. The dynamic calculation method is used. The minimum value of the casing anti-external collapse strength in year X is 61.56MPa. At this time, it can be considered that the casing strength of the newly added wells should be higher than 61.56MPa. The minimum casing collapse strength in X+3 is 65.18MPa. At this time, it can be considered that the casing strength of the newly added wells should be higher than 65.18MPa. Similarly, the casing collapse strength of the newly added wells in the block can be dynamically adjusted to reduce the number of casing damaged wells in the later period and meet the safe, efficient and economical production requirements of the oil field.

[0090] In the third specific embodiment, a certain block injection and production well adopts Φ139.7mm production layer casing for periodic injection and production, the target layer depth is 2700-2800m, and the maximum vertical depth of the target layer is H g is 2800m, the maximum formation pressure equivalent density of the target layer is ρ max 1.70g / cm 3 The number of new wells in this block is T, which is 69, and the number of wells with casing damage is N. t There are 5 wells. The situation of casing damaged wells is shown in Table 6:

[0091] Table 6

[0092]

[0093] The calculation results of the minimum anti-external collapse strength of casing damaged wells are shown in Table 7, where μ max =3,y max =20.

[0094] Table 7

[0095]

[0096] Comparing the casing anti-external collapse strength calculated by the equal safety method and the triaxial stress verification method, the minimum value of the casing anti-external collapse strength calculated by the equal safety method and the triaxial stress verification method is 46.7MPa. Based on the existing casing situation, but referring to the minimum value of the casing anti-external collapse strength of the newly designed wells finally calculated by the traditional method, the optimal result of the production casing of the newly designed wells will be the casing with an anti-external collapse strength of 51.6MPa (outer diameter Φ139.7mm, steel grade P110, wall thickness 7.72mm). The anti-external collapse strength of the wells with casing damage in this block is greater than or equal to 51.6MPa. If the casing with an anti-external collapse strength of 51.6MPa is selected, there will inevitably be a higher risk of casing damage. The dynamic calculation method is used. The minimum value of the casing anti-external collapse strength in year X is 88.30MPa. At this time, it can be considered that the casing anti-external collapse strength of the newly added wells should be higher than 88.30MPa. In X+5, the minimum casing collapse strength is 99.96MPa. At this time, it can be considered that the casing strength of the newly added wells should be higher than 99.96MPa. Similarly, the casing collapse strength of the newly added wells in the block can be dynamically adjusted to reduce the number of casing damaged wells in the later period and meet the safe, efficient and economical production requirements of the oil field.

[0097] This application introduces the factors of casing damage over time into the casing strength design. The main reasons for casing damage are geological factors, engineering factors, casing quality factors, and casing corrosion, among which geological factors are generally the dominant factors and play a decisive role. This application calculates the casing damage risk coefficient based on the proportion of casing damage in the block, and judges the degree of influence of the formation on the casing by the years of use of the casing. If the damage time is shorter, the influence of the formation change is greater. At the same time, this application combines the anti-external collapse strength of the damaged casing and the basic anti-external collapse strength of the casing, and calculates the casing damage risk value by citing the casing damage weight and logarithmic function method. Through this dynamic adjustment method, the casing damage risk value will change according to the different damage years of the production well casing, thereby timely and reasonably determining the minimum casing anti-external collapse strength, that is, taking into account the complex situations such as the interaction between the casing and the rock and the stress distribution over time. The minimum value of the anti-external collapse strength (i.e., the minimum casing anti-external collapse strength) is calculated every X years, so as to select the appropriate casing anti-external collapse strength value for the newly added well (i.e., select the appropriate actual casing anti-external collapse value for the well to be adjusted), thereby reducing the risk of casing damage. This application can not only meet the requirements of wellbore integrity of injection and production wells, but also meet the needs of low-cost long-term development of oil field construction, and ensure the long-term safe operation of new wells. Compared with the current new well design method, it is more scientific and economical.

[0098] In this embodiment, the casing damage risk coefficient and the casing damage weight are calculated based on the casing damage parameters in the historical implementation wells; the casing strength parameters are determined, and the basic casing anti-external collapse strength is calculated based on the casing strength parameters, and the casing damage risk value of the implementation well to be adjusted is calculated using the casing damage weight and the basic casing anti-external collapse strength; the minimum casing anti-external collapse strength of the implementation well to be adjusted is calculated based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value; and the actual casing anti-external collapse value of the implementation well to be adjusted is determined based on the minimum casing anti-external collapse strength. The present application first calculates the casing damage risk coefficient, casing damage weight and basic casing anti-external collapse strength, and then calculates the casing damage risk value of the well to be adjusted based on the basic casing anti-external collapse strength and the casing damage weight. Finally, the minimum casing anti-external collapse strength of the well to be adjusted is comprehensively calculated based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value, so as to determine the actual casing anti-external collapse value of the well to be adjusted based on the minimum casing anti-external collapse strength, which can realize dynamic adjustment of the production casing anti-external collapse strength and obtain the minimum casing anti-external collapse strength, so as to scientifically and economically select the actual casing anti-external collapse value based on the minimum casing anti-external collapse strength, and can meet the production needs of new wells in different work areas and ensure the long-term safe operation of new wells.

[0099] See also Figure 2 As shown, an embodiment of the present invention discloses a device for determining a casing anti-external collapse value, which may specifically include:

[0100] A coefficient and weight calculation module 11 is used to calculate the casing damage risk coefficient and the casing damage weight based on the casing damage parameters in the historical implementation wells;

[0101] The strength and risk value calculation module 12 is used to determine the casing strength parameters, calculate the basic anti-external collapse strength of the casing based on the casing strength parameters, and calculate the casing damage risk value of the well to be adjusted by using the casing damage weight and the basic anti-external collapse strength of the casing;

[0102] A minimum anti-external collapse strength calculation module 13, used to calculate the minimum anti-external collapse strength of the casing of the well to be adjusted based on the casing damage risk coefficient, the basic anti-external collapse strength of the casing and the casing damage risk value;

[0103] The collapse value determination module 14 is used to determine the actual casing collapse resistance value of the well to be adjusted based on the minimum casing collapse resistance strength.

[0104] In this embodiment, the casing damage risk coefficient and the casing damage weight are calculated based on the casing damage parameters in the historical implementation wells; the casing strength parameters are determined, and the basic casing anti-external collapse strength is calculated based on the casing strength parameters, and the casing damage risk value of the implementation well to be adjusted is calculated using the casing damage weight and the basic casing anti-external collapse strength; the minimum casing anti-external collapse strength of the implementation well to be adjusted is calculated based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value; and the actual casing anti-external collapse value of the implementation well to be adjusted is determined based on the minimum casing anti-external collapse strength. The present application first calculates the casing damage risk coefficient, casing damage weight and basic casing anti-external collapse strength, and then calculates the casing damage risk value of the well to be adjusted based on the basic casing anti-external collapse strength and the casing damage weight. Finally, the minimum casing anti-external collapse strength of the well to be adjusted is comprehensively calculated based on the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value, so as to determine the actual casing anti-external collapse value of the well to be adjusted based on the minimum casing anti-external collapse strength, which can realize dynamic adjustment of the production casing anti-external collapse strength and obtain the minimum casing anti-external collapse strength, so as to scientifically and economically select the actual casing anti-external collapse value based on the minimum casing anti-external collapse strength, and can meet the production needs of new wells in different work areas and ensure the long-term safe operation of new wells.

[0105] In some specific embodiments, the coefficient and weight calculation module 11 may specifically include:

[0106] A casing damage risk coefficient calculation module, used for calculating the casing damage risk coefficient based on the number of casing damage wells in the casing damage parameters and the number of implemented wells in the wells to be adjusted;

[0107] The casing damage weight calculation module is used to calculate the casing damage weight based on the maximum service life of the casing in the casing damage parameters and a preset casing wear weight table.

[0108] In some specific embodiments, the coefficient and weight calculation module 11 may specifically include:

[0109] The casing damage risk coefficient calculation module is used to calculate the casing damage risk coefficient using a preset damage risk coefficient calculation formula and based on the number of casing damage wells in the casing damage parameters and the number of implemented wells in the implementation wells to be adjusted; the damage risk coefficient calculation formula is:

[0110] a=N t / T;

[0111] Among them, N t is the number of casing damaged wells in the casing damage parameters, and T is the number of implemented wells in the wells to be adjusted.

[0112] In some specific embodiments, the coefficient and weight calculation module 11 may specifically include:

[0113] The casing damage weight calculation module is used to calculate the casing damage weight using a preset casing damage weight calculation formula and based on the maximum casing service life in the casing damage parameters and a preset casing wear weight table; the casing damage weight calculation formula is:

[0114]

[0115] Among them, μ max is the weight value of the casing in the first year of use, y is the service life of the casing, and y max is the maximum production life of casing, and k is the calculation coefficient.

[0116] In some specific embodiments, the strength and risk value calculation module 12 may specifically include:

[0117] A parameter determination module is used to determine casing strength parameters; the casing strength parameters include the vertical depth of the production casing, the maximum formation pressure equivalent density of the target layer, and the casing anti-external collapse safety factor;

[0118] The basic anti-external collapse strength calculation module of the casing is used to calculate the basic anti-external collapse strength of the casing based on the basic anti-external collapse strength calculation formula of the casing and the casing strength parameters; the basic anti-external collapse strength calculation formula of the casing is:

[0119] P=H g ×ρ max ×S C ×G;

[0120] Among them, H g is the vertical depth of the production casing, ρ max is the maximum formation pressure equivalent density of the target layer, S C is the safety factor of the casing against external collapse, and G is the gravity constant.

[0121] In some specific embodiments, the strength and risk value calculation module 12 may specifically include:

[0122] The casing damage risk value calculation module is used to calculate the casing damage risk value of the well to be adjusted based on a preset risk value calculation formula and using the casing damage weight and the basic anti-external collapse strength of the casing; the risk value calculation formula is:

[0123]

[0124] Among them, P i is the basic anti-external collapse strength of the casing at the damaged part, μ is the casing damage weight, and μ i is the weight corresponding to the casing service life, μ max It is the weight value of the casing in the first year of use.

[0125] In some specific embodiments, the minimum anti-external collapse strength calculation module 13 may specifically include:

[0126] The minimum casing anti-external collapse strength calculation module is used to calculate the minimum casing anti-external collapse strength of the well to be adjusted based on the preset minimum casing anti-external collapse strength calculation formula and the casing damage risk coefficient, the basic casing anti-external collapse strength and the casing damage risk value; the minimum casing anti-external collapse strength calculation formula is:

[0127] P min =P+(α+1)×β;

[0128] Wherein, P is the basic anti-external collapse strength of the casing, β is the casing damage risk value, and α is the casing damage risk coefficient.

[0129] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is used to store a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the method for determining the casing anti-external collapse value performed by the electronic device disclosed in any of the aforementioned embodiments.

[0130] In this embodiment, the power supply 23 is used to provide working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0131] In addition, the memory 22, as a carrier for storing resources, can be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon include an operating system 221, a computer program 222 and data 223, etc. The storage method can be temporary storage or permanent storage.

[0132] The operating system 221 is used to manage and control the hardware devices and computer programs 222 on the electronic device 20, so as to realize the operation and processing of the data 223 in the memory 22 by the processor 21, which can be Windows, Unix, Linux, etc. In addition to including a computer program that can be used to complete the method for determining the casing anti-external crush value performed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 can further include a computer program that can be used to complete other specific tasks. In addition to including data transmitted from an external device received by the casing anti-external crush value determination device, the data 223 can also include data collected by its own input and output interface 25, etc.

[0133] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0134] Furthermore, an embodiment of the present application also discloses a computer-readable storage medium, in which a computer program is stored. When the computer program is loaded and executed by a processor, the steps of the method for determining the casing anti-external collapse value disclosed in any of the aforementioned embodiments are implemented.

[0135] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0136] The above is a detailed introduction to a method, device, equipment and storage medium for determining the anti-external collapse value of casing provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for determining the external collapse resistance value of a casing, characterized in that, it includes: Calculating the casing damage risk coefficient and the casing damage weight respectively based on the casing damage parameters in the historical implemented wells; Determining the casing strength parameters, calculating the basic external collapse strength of the casing based on the casing strength parameters, and calculating the casing damage risk value of the well to be adjusted using the casing damage weight and the basic external collapse strength of the casing; Calculating the minimum external collapse strength of the casing of the well to be adjusted based on the casing damage risk coefficient, the basic external collapse strength of the casing, and the casing damage risk value; Determining the actual external collapse resistance value of the casing of the well to be adjusted based on the minimum external collapse strength of the casing.

2. The method for determining the external collapse resistance value of a casing according to claim 1, characterized in that, The calculating the casing damage risk coefficient and the casing damage weight respectively based on the casing damage parameters in the historical implemented wells includes: Calculating the casing damage risk coefficient based on the number of casing damaged wells in the casing damage parameters and the number of implemented wells in the well to be adjusted; Calculating the casing damage weight based on the longest service life of the casing in the casing damage parameters and a preset casing wear weight table.

3. The method for determining the external collapse resistance value of a casing according to claim 2, characterized in that, The calculating the casing damage risk coefficient based on the number of casing damaged wells in the casing damage parameters and the number of implemented wells in the well to be adjusted includes: Using a preset damage risk coefficient calculation formula and calculating the casing damage risk coefficient based on the number of casing damaged wells in the casing damage parameters and the number of implemented wells in the well to be adjusted; the damage risk coefficient calculation formula is: α = N t / T; where N t is the number of damaged casing wells among the casing damage parameters, and T is the number of implemented wells among the wells to be adjusted and implemented.

4. The method for determining the external collapse resistance value of a casing according to claim 2, characterized in that, The calculating the casing damage weight based on the longest service life of the casing in the casing damage parameters and a preset casing wear weight table includes: Using a preset casing damage weight calculation formula and calculating the casing damage weight based on the longest service life of the casing in the casing damage parameters and a preset casing wear weight table; the casing damage weight calculation formula is: Among them, μ max is the weight value of the casing in the first year of use, y is the service life of the casing, y max is the longest production life of the casing, and k is the calculation coefficient.

5. The method for determining the external collapse resistance value of a casing according to claim 1, characterized in that, The determining the casing strength parameters and calculating the basic external collapse strength of the casing based on the casing strength parameters includes: Determining the casing strength parameters; the casing strength parameters include the vertical depth of the production casing, the equivalent density of the maximum formation pressure in the target layer, and the safety factor for external collapse resistance of the casing; Using a basic external collapse strength calculation formula of the casing and calculating the basic external collapse strength of the casing based on the casing strength parameters; the basic external collapse strength calculation formula of the casing is: P = H g × ρ max × S C × G; Among them, H g is the vertical depth of the production casing run in, ρ max is the equivalent density of the maximum formation pressure of the target formation, S C is the external collapse safety factor of the casing, and G is the gravitational constant.

6. The method for determining the external collapse resistance value of a casing according to claim 1, characterized in that, The calculating the casing damage risk value of the well to be adjusted using the casing damage weight and the basic external collapse strength of the casing includes: Based on a preset risk value calculation formula and using the casing damage weight and the basic external collapse strength of the casing to calculate the casing damage risk value of the well to be adjusted; the risk value calculation formula is: Among them, P i is the basic external collapse strength of the casing at the casing damage location, μ is the casing damage weight, μ i is the weight corresponding to the service life of the casing, μ max is the weight value when the casing is used in the first year.

7. The method for determining the external extrusion resistance value of a casing according to any one of claims 1 to 6, characterized in that, calculating the minimum external extrusion resistance strength of the well to be adjusted and implemented based on the casing damage risk coefficient, the basic external extrusion resistance strength of the casing, and the casing damage risk value, including: using a preset calculation formula for the minimum external extrusion resistance strength of the casing, and calculating the minimum external extrusion resistance strength of the well to be adjusted and implemented based on the casing damage risk coefficient, the basic external extrusion resistance strength of the casing, and the casing damage risk value; the calculation formula for the minimum external extrusion resistance strength of the casing is: P min = P + (α + 1) × β; where P is the basic external extrusion resistance strength of the casing, β is the casing damage risk value, and α is the casing damage risk coefficient.

8. A device for determining the external extrusion resistance value of a casing, characterized in that, comprising: a coefficient and weight calculation module, configured to calculate a casing damage risk coefficient and a casing damage weight respectively based on casing damage parameters in historical implemented wells; a strength and risk value calculation module, configured to determine casing strength parameters, calculate the basic external extrusion resistance strength of the casing based on the casing strength parameters, and calculate the casing damage risk value of the well to be adjusted and implemented by using the casing damage weight and the basic external extrusion resistance strength of the casing; a minimum external extrusion resistance strength calculation module, configured to calculate the minimum external extrusion resistance strength of the well to be adjusted and implemented based on the casing damage risk coefficient, the basic external extrusion resistance strength of the casing, and the casing damage risk value; an external extrusion resistance value determination module, configured to determine the actual external extrusion resistance value of the well to be adjusted and implemented based on the minimum external extrusion resistance strength.

9. An electronic device, characterized in that, comprising: a memory, configured to store a computer program; a processor, configured to execute the computer program to implement the method for determining the external extrusion resistance value of a casing according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, used to store a computer program; wherein, when the computer program is executed by a processor, the method for determining the external extrusion resistance value of a casing according to any one of claims 1 to 7 is implemented.

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