Method, device, equipment and storage medium for characterizing drillability of gravel formation

Abstract

This invention provides a method, apparatus, device, and storage medium for characterizing the drillability of gravel formations. The method includes: obtaining a first mapping relationship between the calcium carbonate content of the rocks in the gravel formation and the formation depth; the first mapping relationship is used to characterize the lithological sedimentary patterns of the gravel formation; based on well logging interpretation data of the gravel formation, obtaining a second mapping relationship between the abrasive index of the rocks in the gravel formation and the formation depth, and a third mapping relationship between the impact index and the formation depth; the second mapping relationship is used to characterize the abrasiveness of the sandstone in the gravel formation, and the third mapping relationship is used to characterize the impact of the gravel on the drill bit; outputting the first, second, and third mapping relationships to characterize the drillability of the gravel formation. This invention characterizes the drillability of gravel formations through lithological sedimentary patterns, the abrasiveness of the sandstone, and the impact of the gravel on the drill bit.

Description

Technical Field

[0001] The present invention relates to oil and gas production technology, and in particular to a method, device, equipment and storage medium for characterizing the drillability of a gravel formation. Background Art

[0002] In the process of oil and gas extraction, a drill bit is needed to drill through the formation to form a wellbore so that various exploration equipment can reach the oil and gas production layer. Among them, the drillability of formations with different lithology (i.e. rock composition, structure and other properties) is different. At present, commonly used drill bits include roller bits, polycrystalline diamond compact (PDC) drill bits, etc. For PDC drill bits, how to characterize the drillability of the formation is the key to determining whether the selection of PDC drill bits is reasonable and the drilling efficiency.

[0003] At present, for PDC drill bits, a micro drill bit test method can be used to characterize the drillability of the formation. When using this method, it is first necessary to obtain a rock sample from the formation to be studied, and then use a miniature drill bit to form a cutting mark on the rock sample. The drillability of the formation is characterized by the amount of pressure applied to the miniature drill bit and the depth of the cutting mark on the rock sample.

[0004] However, the above method is only applicable to characterizing the drillability of homogeneous formations, and cannot characterize the drillability of gravel formations with strong heterogeneity. Therefore, how to characterize the drillability of gravel formations for PDC drill bits is an urgent problem to be solved. Summary of the invention

[0005] The present invention provides a method, device, equipment and storage medium for characterizing the drillability of a gravel formation, so as to solve the technical problem of how to characterize the drillability of a gravel formation for a PDC drill bit.

[0006] In a first aspect, the present invention provides a method for characterizing drillability of a gravel formation, comprising:

[0007] Obtaining a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth; wherein the first mapping relationship is used to characterize the lithological sedimentation law of the gravel formation;

[0008] Based on the logging interpretation data of the gravel formation, a second mapping relationship between the abrasiveness index of the rock in the gravel formation and the formation depth, and a third mapping relationship between the impact index and the formation depth are obtained; wherein the second mapping relationship is used to characterize the abrasiveness of the sandstone in the gravel formation, and the third mapping relationship is used to characterize the impact of the gravel in the gravel formation on the drill bit;

[0009] The first mapping relationship, the second mapping relationship and the third mapping relationship are output; wherein the first mapping relationship, the second mapping relationship and the third mapping relationship are used to characterize the drillability of the gravel formation.

[0010] Optionally, the obtaining of a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth includes:

[0011] receiving the mass of rock cuttings from different formation depths of the gravel formation, and the mass of calcium carbonate of the rock cuttings;

[0012] The calcium carbonate content of the rock from each formation depth is obtained by dividing the calcium carbonate mass of the rock cuttings from each formation depth by the mass of the rock cuttings;

[0013] The first mapping relationship is obtained according to the calcium carbonate content of the rocks from each stratum depth.

[0014] Optionally, the obtaining, based on the well logging interpretation data of the gravel formation, a second mapping relationship between the grinding index of the rock in the gravel formation and the formation depth includes:

[0015] Obtaining the mudstone volume ratio of rocks at different formation depths according to the gamma values ​​of rocks at different formation depths in the well logging interpretation data;

[0016] Obtaining the sandstone volume ratio of rocks at each formation depth according to the mudstone volume ratio of rocks at each formation depth, and the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the well logging interpretation data;

[0017] According to the sandstone volume ratio of the rock at each formation depth and the acoustic wave time difference of the rock at each formation depth in the logging interpretation data, the grinding index of the rock at each formation depth is obtained; wherein the grinding index of the rock is positively correlated with the sandstone volume ratio of the rock;

[0018] The second mapping relationship is acquired according to the grinding index of the rock at each formation depth.

[0019] Optionally, obtaining the mudstone volume ratio of rocks at different formation depths according to the gamma values ​​of rocks at different formation depths in the logging interpretation data includes:

[0020] Obtaining the mudstone index of rocks at different formation depths according to the gamma values ​​corresponding to different formation depths in the logging interpretation data;

[0021] According to the mudstone index of the rock at each formation depth, the mudstone volume ratio of the rock at each formation depth is obtained.

[0022] Optionally, the obtaining of the sandstone volume fraction of rocks at each formation depth according to the mudstone volume fraction of rocks at each formation depth, and the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the well logging interpretation data, comprises:

[0023] According to the porosity of the rock at each stratum depth, the pore volume ratio of the rock at each stratum depth is obtained;

[0024] Obtaining the unit mass of the mudstone of the rock at each stratum depth according to the mudstone volume ratio and the mudstone density of the rock at each stratum depth;

[0025] According to the porosity of the rock at each formation depth and the density of the fluid, the unit mass of the fluid in the pores of the rock at each formation depth is obtained;

[0026] According to the pore volume percentage of the rock at each formation depth, the mudstone volume percentage of the rock at each formation depth, the unit mass of the mudstone of the rock at each formation depth, the unit mass of the fluid in the pores of the rock at each formation depth, the sandstone density, and the first constraint and the second constraint, the sandstone volume percentage of the rock at each formation depth is obtained; wherein the first constraint is that the sum of the pore volume percentage, sandstone volume percentage, mudstone volume percentage, and gravel volume percentage of the rock is equal to 1, and the second constraint is that the unit mass of the rock is equal to the sum of the unit mass of the fluid, the unit mass of the gravel, the unit mass of the sandstone, and the unit mass of the mudstone.

[0027] Optionally, obtaining the grinding index of the rock at each formation depth according to the sandstone volume ratio of the rock at each formation depth and the acoustic wave time difference of the rock at each formation depth in the logging interpretation data includes:

[0028] The quotient of the sandstone volume ratio and the acoustic wave time difference of the rock at each formation depth is normalized to obtain the grinding index of the rock at each formation depth.

[0029] Optionally, the obtaining, based on the well logging interpretation data of the gravel formation, a third mapping relationship between the impact index of the rock in the gravel formation and the formation depth includes:

[0030] Obtaining the compressive strength of rocks at different formation depths according to the acoustic time difference of rocks at different formation depths in the well logging interpretation data;

[0031] Obtaining the impact index of the rock at each stratum depth according to the difference in compressive strength between the rock at each stratum depth and the rock at the previous stratum depth, and the difference in stratum depth; wherein the impact index of the rock is used to characterize the rate of change of the compressive strength of the rock;

[0032] The third mapping relationship is acquired according to the impact index of the rock at each formation depth.

[0033] In a second aspect, the present invention provides a device for characterizing drillability of a gravel formation, comprising:

[0034] A first acquisition module is used to acquire a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth; wherein the first mapping relationship is used to characterize the lithological sedimentation law of the gravel formation;

[0035] A second acquisition module is used to acquire a second mapping relationship between abrasiveness index and formation depth of the rock in the gravel formation, and a third mapping relationship between impact index and formation depth, based on the logging interpretation data of the gravel formation; wherein the second mapping relationship is used to characterize the abrasiveness of the sandstone in the gravel formation, and the third mapping relationship is used to characterize the impact of the gravel in the gravel formation on the drill bit;

[0036] An output module is used to output the first mapping relationship, the second mapping relationship and the third mapping relationship; wherein the first mapping relationship, the second mapping relationship and the third mapping relationship are used to characterize the drillability of the gravel formation.

[0037] In a third aspect, the present invention provides an electronic device, comprising: at least one processor and a memory;

[0038] The memory stores computer-executable instructions;

[0039] The at least one processor executes the computer-executable instructions stored in the memory, so that the electronic device performs the method described in any one of the first aspects.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium having computer-executable instructions stored thereon. When the computer-executable instructions are executed by a processor, the method described in any one of the first aspects is implemented.

[0041] The method, device, equipment, and storage medium for characterizing the drillability of gravel formations provided by the present invention take into account that the more limestone gravel a gravel formation contains, the easier it is for a PDC drill bit to crush rocks in the gravel formation, and the main component of limestone is calcium carbonate. The present invention characterizes the lithological sedimentation law of the gravel formation by using a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth. Taking into account that the more quartz content in the sandstone of the gravel formation, the greater the degree of wear on the PDC drill bit, the present invention uses a second mapping relationship between the grinding index of the rock in the gravel formation and the formation depth to characterize the degree of grinding of the sandstone in the gravel formation. And, taking into account that the gravel in the gravel formation may impact and damage the shoulder cutting teeth of the PDC drill bit, the present invention uses a third mapping relationship between the impact index of the rock in the gravel formation and the formation depth to characterize the degree of impact of the gravel in the gravel formation on the PDC drill bit. Furthermore, through the lithological sedimentary laws of the above-mentioned gravel formations, the abrasiveness of the sandstone in the gravel formations, and the impact degree of the gravel in the gravel formations on the drill bit, the limitations of the micro-drill bit testing method were overcome, and the drillability of the gravel formation was characterized according to the actual failure principle of the PDC drill bit (the diamond micrograins of the PDC drill bit fail and spall under the quartz grinding of the gravel formation, and the failure and spalling of the diamond material of the PDC drill bit due to fatigue fracture under impact stress). BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 This is a schematic diagram of the structure of a gravel formation;

[0044] Figure 2 A schematic diagram of a process for characterizing drillability of a gravel formation provided by the present invention;

[0045] Figure 3 A schematic flow chart of a method for obtaining a second mapping relationship provided by the present invention;

[0046] Figure 4 A schematic flow chart of a method for obtaining a third mapping relationship provided by the present invention;

[0047] Figure 5 A schematic flow chart of another method for characterizing drillability of gravel formations provided by the present invention;

[0048] Figure 6A schematic diagram of the structure of a device for characterizing drillability of a gravel formation provided by the present invention;

[0049] Figure 7 The present invention provides a schematic diagram of the structure of an electronic device. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all 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.

[0051] Gravel strata are formed by weathered and peeled rocks being transported by water for a certain distance and then deposited. Figure 1 is a schematic diagram of the structure of a gravel stratum. Figure 1 As shown, the gravel formation includes gravel, sandstone and mudstone ( Figure 1 In the gravel formation shown, the parts other than the gravel are filled with sandstone and mudstone).

[0052] The compaction degree of gravel formations formed in different geological ages is different, and the diagenesis is also different. The older the geological age and the deeper the burial depth, the better the diagenesis; the more recent the geological age and the shallower the burial depth, the worse the diagenesis. According to its diagenesis, the gravel formation can be divided into undiagenetic section, quasi-diagenetic section, and diagenetic section. For the gravel in the gravel formation, the closer the gravel is to the source (the location of the weathered and flaked rock before it flaked off), the larger the gravel particle size; the farther the gravel is from the source, the smaller the gravel particle size, that is, the gravel in the gravel formation is of different sizes and unevenly distributed.

[0053] It should be understood that Figure 1 The schematic diagram in the figure takes triangular gravel as an example, but the gravel shapes specifically included in the gravel formation include but are not limited to the above-mentioned triangle, and may also be other shapes, or include gravel of multiple shapes.

[0054] Taking the gravel stratum in area A as an example, the lithology distribution law of the gravel stratum in the area can be shown in Table 1.

[0055] Table 1

[0056]

[0057] Sorting refers to the uniformity of gravel particle size. From the gravel particle sizes corresponding to different stratification sections in Table 1, it can be seen that the gravel particles included in each stratification section are of different sizes, that is, the lithology sorting of each stratification section is poor. In addition, the gravel composition of each stratification section is also different. In other words, the gravel particles mixed in the gravel formation are of different sizes, uneven distribution and different compositions, that is, the gravel formation is highly heterogeneous.

[0058] At present, the method of using micro drill bit testing method in the prior art to characterize the drillability of the formation for PDC drill bits is only applicable to characterizing the drillability of homogeneous formations, and cannot characterize the drillability of the gravel formation with strong heterogeneity mentioned above.

[0059] The inventors found through research during the drilling process that the gravel formation has the following main characteristics:

[0060] 1. The more limestone gravel a gravel formation contains, the easier it is for the PDC drill bit to break the rock in the gravel formation.

[0061] 2. The more quartz content there is in the sandstone of the gravel formation, the greater the wear on the PDC drill bit.

[0062] 3. Due to the presence of gravel in the gravel formation, vortex is easily formed when using a PDC drill bit to drill the gravel formation, causing impact damage to the shoulder cutting teeth of the PDC drill bit.

[0063] Therefore, taking into account the characteristics of the above-mentioned gravel formations, the present application proposes a method for characterizing the drillability of gravel formations, which accurately characterizes the drillability of gravel formations for PDC drill bits through the lithological sedimentation laws of gravel formations, the abrasiveness of sandstone, and the impact of gravel in gravel formations on drill bits.

[0064] For the convenience of description in the following embodiments, the PDC drill bit is referred to as a drill bit for short. That is, the drill bit in the embodiments of the present invention is equivalent to the PDC drill bit.

[0065] The technical solution of the present invention is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0066] In a specific implementation, the method provided by the present invention may be executed by an electronic device, which may be a device with processing functions such as a server and a terminal.

[0067] Figure 2 The present invention provides a flowchart of a method for characterizing the drillability of a gravel formation. Figure 2 As shown, the method comprises the following steps:

[0068] S101. Obtain a first mapping relationship between the calcium carbonate content of rocks in a gravel formation and the formation depth.

[0069] Considering that as the buried depth of the gravel formation increases, the more limestone gravels there are, the easier it is for the drill bit to break the rocks in the gravel formation, and the main component of limestone is calcium carbonate (CaCO3). Therefore, the present invention uses the first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth to represent the lithological sedimentation law of the gravel formation.

[0070] The calcium carbonate content of the rocks in the gravel formation can be determined, for example, by drilling the gravel formation and measuring the calcium carbonate content in the rock cuttings generated during the drilling operation to obtain the lithological sedimentation law of the gravel formation.

[0071] The electronic device can receive the mass of rock cuttings at different formation depths from the gravel formation, and the mass of calcium carbonate of the rock cuttings. Then the mass of calcium carbonate of the rock cuttings is divided by the mass of the rock cuttings to obtain the calcium carbonate content of the rock at each formation depth. Exemplarily, the electronic device can receive the mass of the rock cuttings, the mass of calcium carbonate of the rock cuttings, and the depth of the corresponding formation through an application program interface (API) or a graphical user interface (GUI).

[0072] Alternatively, the user can also add a sufficient amount of hydrochloric acid solution (hydrogen chloride solution) to the rock cuttings to allow the two to react fully, and then weigh the residue after the reaction is complete. The electronic device can receive the mass of the rock cuttings before the reaction with the hydrochloric acid solution as the first mass, and receive the mass of the residue after the reaction with the hydrochloric acid solution as the second mass. The electronic device then subtracts the first mass from the second mass to obtain the mass of carbon dioxide generated by the reaction of the rock cuttings with the above-mentioned hydrochloric acid solution. The electronic device then obtains the mass of calcium carbonate in the rock cuttings based on the corresponding relationship between the mass of carbon dioxide and the mass of calcium carbonate in the following chemical equation (0).

[0073] CaCO3+2HCL→CaCL2+CO2↑+H2O (0)

[0074] The chemical equation indicates that calcium carbonate (CaCO3) reacts with hydrogen chloride (HCL) to generate calcium chloride (CaCL2), carbon dioxide (CO2) gas, and water (H2O). The electronic device can divide the calcium carbonate mass of the rock cuttings by the first mass to obtain the calcium carbonate content of the rock at each formation depth. After obtaining the calcium carbonate mass of the rock cuttings and their formation depth, the electronic device uses the corresponding relationship between the calcium carbonate mass of the rock cuttings and the formation depth as a first mapping relationship, and uses the first mapping relationship to characterize the lithological deposition law of the gravel formation.

[0075] Alternatively, the electronic device may also directly receive the first mapping relationship input by the user, or the user may send the first mapping relationship to the electronic device through other devices.

[0076] S102. Based on the logging interpretation data of the gravel formation, a second mapping relationship between the grinding index of the rock in the gravel formation and the formation depth, and a third mapping relationship between the impact index and the formation depth are obtained.

[0077] In the process of drilling through the gravel formation, the drill bit breaks the rock under the action of axial pressure and rotation speed. At the same time, the mineral components in the sandstone of the rock will cause it to be abrasive. Among them, the ability of the rock to wear the drill bit is called the abrasiveness of the rock. Therefore, the abrasiveness of the sandstone in the gravel formation can be used to characterize the drillability of the gravel formation. Among them, the abrasiveness of the sandstone in the gravel formation can be expressed by the abrasiveness index of the rock in the gravel formation. The higher the abrasiveness index, the greater the abrasiveness, and the lower the abrasiveness index, the smaller the abrasiveness, or the higher the abrasiveness index, the smaller the abrasiveness, and the lower the abrasiveness index, the greater the abrasiveness.

[0078] Considering that the drill bit is prone to vortexing and impact damage of the shoulder cutting teeth when drilling into different gravel formations, and the impact damage is caused by the impact of the gravel in the gravel formation on the drill bit, the impact degree of the gravel in the gravel formation on the drill bit can be used to characterize the drillability of the gravel formation. Among them, the impact degree of the sandstone in the gravel formation can be represented by the impact index of the rock in the gravel formation. The higher the impact index, the greater the impact degree, and the lower the impact index, the smaller the impact degree. Alternatively, the higher the impact index, the smaller the impact degree, and the lower the impact index, the greater the impact degree.

[0079] For example, the electronic device can obtain geological information of the gravel formation from the logging interpretation data of the gravel formation, and then obtain the grinding index and impact index of the rock of the gravel formation based on the geological information of the gravel formation. Then, the electronic device uses the corresponding relationship between the grinding index and the formation depth as the second mapping relationship, and the corresponding relationship between the impact index and the formation depth as the third mapping relationship.

[0080] S103: Output a first mapping relationship, a second mapping relationship, and a third mapping relationship.

[0081] After obtaining the first mapping relationship, the second mapping relationship, and the third mapping relationship, the electronic device may output the above mapping relationships. The mapping relationships outputted here may be displayed in the form of a diagram, or in the form of a table, etc., which is not limited in the present invention. It should be understood that the output mentioned here may be outputted by the electronic device through its own user interface, or sent by the electronic device to other display devices for display, etc.

[0082] Taking the first mapping relationship as an example, for example, the electronic device can output the illustrated first mapping relationship, wherein the calcium carbonate content of the rock is used as X-axis data and the stratum depth is used as Y-axis data. The illustrated diagram can more clearly show the change of the calcium carbonate content with the stratum depth, and further more clearly depict the drillability of different gravel strata.

[0083] In this embodiment, considering that the more limestone gravel a gravel formation contains, the easier it is for a PDC drill bit to crush rocks in the gravel formation, and the main component of limestone is calcium carbonate, the present invention characterizes the lithological sedimentation law of the gravel formation by using a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth. Considering that the more quartz content a sandstone in a gravel formation contains, the greater the degree of wear on the PDC drill bit, the present invention characterizes the degree of abrasiveness of the sandstone in the gravel formation by using a second mapping relationship between the grinding index of the rock in the gravel formation and the formation depth. And, considering that the gravel in the gravel formation may impact damage the shoulder cutting teeth of the PDC drill bit, the present invention characterizes the degree of impact of the gravel in the gravel formation on the PDC drill bit by using a third mapping relationship between the impact index of the rock in the gravel formation and the formation depth. Furthermore, through the lithological sedimentary laws of the above-mentioned gravel formations, the abrasiveness of the sandstone in the gravel formations, and the impact degree of the gravel in the gravel formations on the drill bit, the limitations of the micro-drill bit testing method were overcome, and the drillability of the gravel formation was characterized according to the actual failure principle of the PDC drill bit (the diamond micrograins of the PDC drill bit fail and spall under the quartz grinding of the gravel formation, and the failure and spalling of the diamond material of the PDC drill bit due to fatigue fracture under impact stress).

[0084] As mentioned above, the electronic device can obtain the second mapping relationship between the grinding index of the rock in the gravel formation and the formation depth based on the logging interpretation data of the gravel formation. For this process, optionally, FIG3 is a flow chart of a method for obtaining the second mapping relationship provided by the present invention. Figure 3 As shown, the method comprises the following steps:

[0085] S201. Obtain the mudstone volume ratio of the rocks at different formation depths according to the gamma values ​​of the rocks at different formation depths in the logging interpretation data.

[0086] For example, the electronic device can first obtain the gamma value of the rock at different formation depths from the logging interpretation data, and then obtain the mudstone index of the rock at each formation depth according to formula (1).

[0087] I_GR=(GR–GR0)÷(GR100–GR0) (1)

[0088] Wherein, I_GR represents the mudstone index of the rock at each formation depth, GR represents the gamma value of the rock at different formation depths, GR0 represents the gamma value corresponding to the pure sandstone calibrated in the gravel formation, and GR100 represents the gamma value corresponding to the pure mudstone calibrated in the gravel formation. Exemplarily, GR0 and GR100 may be pre-stored in the electronic device, or may be received through an API or GUI. Wherein, the values ​​of GR0 and GR100 may be, for example, 15 and 115, respectively.

[0089] After obtaining the mudstone index of each stratum, the electronic device can obtain the mudstone volume ratio (or mudstone volume fraction) of the rock at each stratum depth according to formula (2).

[0090] V_sh=0.083×(2 3.7×I_GR -1) (2)

[0091] Wherein, V_sh represents the volume ratio of mudstone in the rock at each formation depth. The above formula (2) can also be called Larionov model, in which constants such as 0.083 and 3.7 can be values ​​calibrated by the user based on actual logging experience.

[0092] Alternatively, illustratively, the electronic device may also obtain the mudstone volume percentage of the rock at each formation depth according to the gamma value of the rock at different formation depths in the logging interpretation data through formula (3).

[0093]

[0094] Among them, GR, GR0, and GR100 have the same meanings as mentioned above.

[0095] It should be understood that the present invention does not limit the specific implementation method of the electronic device obtaining the mudstone volume percentage of rocks at different formation depths according to the gamma values ​​of rocks at different formation depths in the logging interpretation data. The above method is only a possible implementation method proposed by the present invention, and the electronic device can also obtain the mudstone volume percentage of rocks at different formation depths by other methods.

[0096] S202. Obtain the sandstone volume fraction of rocks at each formation depth based on the mudstone volume fraction of rocks at each formation depth, as well as the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the logging interpretation data.

[0097] For example, after the electronic device obtains the mudstone volume percentage of the rock at each formation depth, the electronic device can also obtain the porosity of the rock at each formation depth from the logging interpretation data. The porosity can be the porosity after compensated neutron calibration (Compensated Neutron Calibrated, CNC), so that the porosity obtained by the electronic device is more accurate, thereby making the calculation process more accurate. Then the electronic device can use the porosity as the pore volume percentage of the rock at each formation depth.

[0098] In addition, the electronic device can also obtain the density of sandstone, mudstone, gravel at each formation depth, and the density of fluid in the pores (such as water, oil, etc.) from the logging interpretation data. For example, if there is only water in the rock pores of the gravel formation, the fluid density is the density of water; if there is only oil in the rock pores of the gravel formation, the fluid density is the density of oil; or, the fluid density can also be the average density of the fluid in the pores, or the density of the larger or smaller density in the fluid, etc.

[0099] Then, the electronic device can obtain the sandstone volume ratio of the rock at each formation depth by using formula (4) and formula (5) as the first constraint condition and the second constraint condition respectively.

[0100] V_SAND+V_sh+V_Other+CNC=1 (4)

[0101] ρ(SAND)×V_SAND+ρ(sh)×V_sh+ρ(Other)×V_Other+ρ(formation fluid)×CNC=ZDEN (5)

[0102] Wherein, formula (4) indicates that the sum of the sandstone volume fraction V_SAND, the mudstone volume fraction V_sh, the gravel volume fraction V_Other, and the pore volume fraction CNC of the rock is equal to 1. Formula (5) indicates that the sum of the unit mass of the fluid, the unit mass of the gravel, the unit mass of the sandstone, and the unit mass of the mudstone is equal to the unit mass of the rock. In formula (5), ρ(SAND) is the sandstone density of the rock, for example, ρ(SAND) can be 2.65, that is, ρ(SAND)×V_SAND represents the unit mass of the sandstone. ρ(sh) is the mudstone density of the rock, for example, ρ(sh) can be 2.64, that is, ρ(sh)×V_sh ​​represents the unit mass of the mudstone. ρ(Other) represents the density of the gravel, that is, ρ(Other)×V_Other represents the unit mass of the gravel. ρ(formation fluid) represents the density of the fluid in the pores of the rock, that is, ρ(formation fluid)×CNC represents the unit mass of the fluid in the pores of the rock. ZDEN represents the unit mass of rock.

[0103] It should be understood that the present invention does not limit the specific implementation method of the electronic device to obtain the sandstone volume ratio of rocks at each formation depth based on the mudstone volume ratio of rocks at each formation depth, and the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the logging interpretation data. The above method is only a possible implementation method proposed by the present invention, and the electronic device can also obtain the sandstone volume ratio of rocks at each formation depth by other methods.

[0104] S203. Obtain the grinding index of the rock at each formation depth according to the sandstone volume ratio of the rock at each formation depth and the acoustic time difference of the rock at each formation depth in the logging interpretation data.

[0105] In a possible implementation, after obtaining the sandstone volume ratio of the rock, the electronic device can also obtain the acoustic time difference of the rock at each formation depth from the well logging interpretation data. The acoustic time difference refers to the time taken by the sound wave to propagate a unit distance (e.g., 1 meter) in the formation, and then the grinding index of the rock at each formation depth is obtained according to formula (6).

[0106]

[0107] Among them, Abrasion Index represents the abrasion index of the rock at each formation depth, DT represents the acoustic time difference of the rock at each formation depth, and Normalize represents normalizing the quotient of V_SAND and DT so that the abrasion index of the rock is within a certain range, for example, between (0,1), so that the above abrasion index is in the same order of magnitude, which is convenient for characterizing the drillability of the gravel formation.

[0108] It should be understood that the present invention does not limit the specific implementation method of the electronic device to obtain the grinding index of the rock at each formation depth according to the sandstone volume ratio of the rock at each formation depth and the acoustic wave time difference of the rock at each formation depth in the logging interpretation data. The above method is only a possible implementation method proposed by the present invention, and the electronic device can also obtain the grinding index of the rock at each formation depth by other methods. For example, the electronic device can also directly use the quotient of the sandstone volume ratio of the rock and the acoustic wave time difference as the grinding index of the rock at each formation depth.

[0109] S204: Obtain a second mapping relationship according to the grinding index of the rock at each formation depth.

[0110] The abrasiveness index of rocks at different formation depths can be used to characterize the abrasiveness of sandstones at different formations. The higher the abrasiveness index, the stronger the abrasiveness of the rock to the drill bit, and the easier it is for the drill bit to wear, that is, the lower the drillability of the formation. The electronic device can use the corresponding relationship between the abrasiveness index of rocks at different formation depths and the formation depth as a second mapping relationship to characterize the abrasiveness of sandstones in gravel formations.

[0111] As mentioned above, the more quartz content in the sandstone of the gravel formation, the greater the wear on the PDC drill bit. Therefore, the greater the volume proportion of sandstone in the rock, the greater the wear on the PDC drill bit.

[0112] In this embodiment, the grinding index of the rock at each formation depth is obtained by the volume proportion of sandstone in the rock at each formation depth and the acoustic time difference of the rock at each formation depth, and then the second mapping relationship is obtained according to the grinding index of the rock at each formation depth, wherein the second mapping relationship can be used to characterize the degree of abrasiveness of the sandstone in the gravel formation. Therefore, the method of this embodiment depicts the failure and spalling of the diamond micrograins of the drill bit under the quartz grinding of the gravel formation during the drilling process of the PDC drill bit. This failure and spalling is the real reason for the grinding failure of the PDC drill bit. That is, the method of this embodiment solves the technical problem that it is difficult to establish a connection between the grinding failure reasons of different PDC drill bits and the drillability of the gravel formation.

[0113] As mentioned above, the electronic device can obtain the third mapping relationship between the impact index of the rock in the gravel formation and the formation depth based on the logging interpretation data of the gravel formation. For this process, optionally, FIG4 is a flow chart of a method for obtaining the third mapping relationship provided by the present invention. Figure 4 As shown, the method comprises the following steps:

[0114] S301. Obtain the compressive strength of rocks at different formation depths based on the acoustic time difference of rocks at different formation depths in the logging interpretation data.

[0115] Compressive strength can be uniaxial compressive strength and triaxial compressive strength, for example, uniaxial compressive strength refers to the load that a rock can withstand per unit area when it is compressed in one direction to fracture (i.e., during the drilling process of a drill bit). For example, the electronic device can obtain the uniaxial compressive strength of rocks at different formation depths based on the acoustic wave time difference of rocks at different formation depths and the Golubev empirical formula.

[0116] Among them, the Golubev empirical formula is shown in formula (7):

[0117]

[0118] In formula (7), UCS represents the uniaxial compressive strength of rock at each formation depth, and values ​​such as 2.44, 109.4, and 145 may be values ​​calibrated based on manual experience.

[0119] S302: Obtain the impact index of the rock at each stratum depth according to the difference in compressive strength between the rock at each stratum depth and the rock at the previous stratum depth, as well as the stratum depth difference.

[0120] Considering that the change rate of the rock's compressive strength is directly related to the impact damage of the drill bit, the change rate of the rock's compressive strength can be regarded as the rock's impact index. The change rate refers to the change rate of the rock's compressive strength with the depth of the formation. Exemplarily, after obtaining the value of the compressive strength at each formation depth, the electronic device can obtain the change rate of the rock's compressive strength according to formula (8), and then obtain the rock's impact index at each formation depth.

[0121]

[0122] Among them, Impact Index represents the impact index of rock, ΔUCS represents the rate of change of the compressive strength of rock, UCS(i+1) represents the compressive strength of rock at the (i+1)th formation depth, UCS(i) represents the compressive strength of rock at the (i)th formation depth, and ΔMD represents the difference between the (i+1)th formation depth and the (i)th formation depth.

[0123] S303: Obtain a third mapping relationship according to the impact index of the rock at each formation depth.

[0124] The impact index of rocks at different formation depths can be used to characterize the impact degree of gravel in different gravel formations on the drill bit. The higher the impact index, the stronger the impact of the rock on the drill bit, and the more likely the drill bit will be damaged by impact, that is, the lower the drillability of the formation. The electronic device can use the corresponding relationship between the impact index of rocks at different formation depths and the formation depth as the third mapping relationship to characterize the impact degree of gravel in the gravel formation on the drill bit.

[0125] As mentioned above, when the drill bit drills gravel formations, vortex is easily formed, causing impact damage to the shoulder cutting teeth of the drill bit. In this embodiment, the impact index of the rock at each formation depth is obtained according to the compressive strength of the rock at each formation depth and the formation depth, and then the third mapping relationship is obtained according to the impact index of the rock at each formation depth. Among them, the third mapping relationship can be used to characterize the degree of impact of the gravel in the gravel formation on the drill bit. Therefore, through the method of this embodiment, the failure and spalling of the diamond material of the PDC drill bit due to fatigue fracture under impact force is characterized. This failure and spalling is the real reason for the impact failure of the PDC drill bit. That is, through the method of this embodiment, the technical problem that it is difficult to establish a connection between the impact failure causes of different PDC drill bits and the drillability of gravel formations is solved.

[0126] Based on all the above embodiments, Figure 5 A schematic diagram of another method for characterizing the drillability of gravel formations provided by the present invention. Figure 5As shown, illustratively, the electronic device can obtain the mass of the rock cuttings generated during the drilling process as the first mass. Then the user adds a sufficient amount of hydrochloric acid solution to the rock cuttings to allow the two to react fully, and then weighs the reaction residue. The electronic device obtains the mass of the reaction residue as the second mass, and then subtracts the first mass from the second mass to obtain the mass of carbon dioxide generated by the reaction of the rock cuttings with the hydrochloric acid solution. Then the electronic device obtains the mass of calcium carbonate of the rock cuttings according to the correspondence between the mass of carbon dioxide and the mass of calcium carbonate in the chemical equation (0). Then the mass of calcium carbonate of the rock cuttings is divided by the mass of the rock cuttings to obtain the calcium carbonate content of the rock cuttings. The electronic device obtains a first mapping relationship based on the calcium carbonate content of the rock cuttings and the formation depth, which is used to characterize the lithological sedimentation law of the gravel formation, and can then be used to characterize the drillability of the gravel formation.

[0127] Exemplarily, the electronic device can also obtain the gamma value of rocks at different formation depths from the logging interpretation data, obtain the mudstone index of the rocks at each formation depth according to the gamma value, and then use the mudstone index to obtain the mudstone volume ratio of the rock. Afterwards, the electronic device can obtain the sandstone volume ratio of the rocks at each formation depth according to the aforementioned first constraint and second constraint. Then, the abrasiveness index of the rocks at each formation depth is obtained by using the acoustic wave time difference in the logging interpretation data and the sandstone volume ratio of the rocks at each formation depth. Then, the electronic device can use the corresponding relationship between the abrasiveness index of the rocks at each formation depth and the formation depth as the second mapping relationship to characterize the abrasiveness of the sandstone in the gravel formation, which can then be used to characterize the drillability of the gravel formation.

[0128] Exemplarily, the electronic device can also obtain the acoustic time difference of rocks at different formation depths from the logging interpretation data, and obtain the uniaxial compressive strength of rocks at each formation depth according to the Golubev empirical formula. Then, the rate of change of the uniaxial compressive strength with the formation depth is used as the impact index of the rocks at each formation depth. The electronic device can use the corresponding relationship between the impact index of the rocks at each formation depth and the formation depth as the third mapping relationship to characterize the impact degree of the gravel in the gravel formation on the drill bit, which can then be used to characterize the drillability of the gravel formation.

[0129] Among them, the same formation depth can be used between the first mapping relationship, the second mapping relationship, and the third mapping relationship, or different formation depths can be used. For example, the formation depth interval in the first mapping relationship can be 50 meters, the formation depth interval in the second mapping relationship can be 5 meters, and the formation depth interval in the third mapping relationship can be 2 meters. It should be understood that the above formation depth interval is only an exemplary value. In actual implementation, the above formation depth interval can also take other values. Alternatively, the formation depth interval can also change with the depth of the gravel formation. For example, the deeper the depth of the gravel formation, the smaller the formation depth interval.

[0130] Exemplarily, the electronic device may also output the first mapping relationship, the second mapping relationship, and the third mapping relationship in the form of a diagram or a table, so as to more clearly describe the drillability of the gravel formation.

[0131] Figure 6 The present invention provides a structural schematic diagram of a gravel formation drillability characterization device. Figure 6 As shown, the device comprises:

[0132] The first acquisition module 41 is used to acquire a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth; wherein the first mapping relationship is used to characterize the lithological sedimentation law of the gravel formation.

[0133] The second acquisition module 42 is used to obtain a second mapping relationship between the abrasiveness index of the rock in the gravel formation and the formation depth, and a third mapping relationship between the impact index and the formation depth based on the logging interpretation data of the gravel formation; wherein the second mapping relationship is used to characterize the abrasiveness of the sandstone in the gravel formation, and the third mapping relationship is used to characterize the impact degree of the gravel in the gravel formation on the drill bit.

[0134] The output module 43 is used to output the first mapping relationship, the second mapping relationship and the third mapping relationship; wherein the first mapping relationship, the second mapping relationship and the third mapping relationship are used to characterize the drillability of the gravel formation.

[0135] Optionally, the first acquisition module 41 is specifically used to receive the mass of rock cuttings from different stratigraphic depths of the gravel formation and the mass of calcium carbonate of the rock cuttings; obtain the calcium carbonate content of rocks from each stratigraphic depth based on the mass of rock cuttings from each stratigraphic depth and the mass of calcium carbonate of the rock cuttings; and obtain the first mapping relationship based on the calcium carbonate content of rocks from each stratigraphic depth.

[0136] Optionally, the second acquisition module 42 is specifically used to obtain the mudstone volume ratio of rocks at each formation depth according to the gamma values ​​of rocks at different formation depths in the logging interpretation data; obtain the sandstone volume ratio of rocks at each formation depth according to the mudstone volume ratio of rocks at each formation depth, and the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the logging interpretation data; obtain the grinding index of rocks at each formation depth according to the sandstone volume ratio of rocks at each formation depth, and the acoustic wave time difference of rocks at each formation depth in the logging interpretation data; obtain the second mapping relationship according to the grinding index of rocks at each formation depth; wherein the grinding index of the rock is positively correlated with the sandstone volume ratio of the rock.

[0137] Optionally, the second acquisition module 42 is specifically used to obtain the mudstone index of rocks at each formation depth according to the gamma values ​​corresponding to different formation depths in the logging interpretation data; and to obtain the mudstone volume ratio of rocks at each formation depth according to the mudstone index of rocks at each formation depth.

[0138] Optionally, the second acquisition module 42 is specifically used to obtain the pore volume percentage of the rock at each formation depth according to the porosity of the rock at each formation depth; obtain the unit mass of the mudstone of the rock at each formation depth according to the mudstone volume percentage of the rock at each formation depth and the mudstone density; obtain the unit mass of the fluid in the pores of the rock at each formation depth according to the porosity of the rock at each formation depth and the fluid density; obtain the unit mass of the fluid in the pores of the rock at each formation depth according to the pore volume percentage of the rock at each formation depth and the mudstone volume percentage of the rock at each formation depth, The unit mass of mudstone of the rock at each stratigraphic depth, the unit mass of the fluid in the pores of the rock at each stratigraphic depth, the density of sandstone, and the first constraint and the second constraint, are used to obtain the volume percentage of sandstone of the rock at each stratigraphic depth; wherein the first constraint is that the sum of the pore volume percentage, sandstone volume percentage, mudstone volume percentage, and gravel volume percentage of the rock is equal to 1, and the second constraint is that the unit mass of the rock is equal to the sum of the unit mass of the fluid, the unit mass of the gravel, the unit mass of the sandstone, and the unit mass of the mudstone.

[0139] Optionally, the second acquisition module 42 is specifically used to normalize the quotient of the sandstone volume ratio and the acoustic wave time difference of the rock at each formation depth to obtain the grinding index of the rock at each formation depth.

[0140] Optionally, the second acquisition module 42 is specifically used to obtain the compressive strength of rocks at each formation depth based on the acoustic wave time difference of rocks located at different formation depths in the logging interpretation data; to obtain the impact index of rocks at each formation depth based on the difference in compressive strength between the rocks at each formation depth and the rocks at the previous formation depth, as well as the formation depth difference; wherein the impact index of the rock is used to characterize the rate of change of the compressive strength of the rock; and to obtain the third mapping relationship based on the impact index of the rocks at each formation depth.

[0141] The gravel formation drillability characterization device provided by the present invention is used to execute the aforementioned method embodiment, and its implementation principle and technical effect are similar, which will not be described in detail.

[0142] Figure 7 This is a schematic diagram of the structure of an electronic device provided by the present invention. Figure 7 As shown, the electronic device may include: at least one processor 51 and a memory 52.

[0143] The memory 52 is used to store programs. Specifically, the programs may include program codes, and the program codes include computer operation instructions.

[0144] The memory 52 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0145] The processor 51 is used to execute the computer-executable instructions stored in the memory 52 to implement a method for characterizing the drillability of a gravel formation.

[0146] The processor 51 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0147] Optionally, in a specific implementation, if the communication interface, the memory 52 and the processor 51 are implemented independently, the communication interface, the memory 52 and the processor 51 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc., but it does not mean that there is only one bus or one type of bus.

[0148] Optionally, in a specific implementation, if the communication interface, the memory 52 and the processor 51 are integrated on a chip, the communication interface, the memory 52 and the processor 51 can communicate through an internal interface.

[0149] The present invention also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0150] The present application also provides a program product, which includes an execution instruction, which is stored in a readable storage medium. At least one processor of an electronic device can read the execution instruction from the readable storage medium, and at least one processor executes the execution instruction so that the electronic device implements the method for characterizing the drillability of gravel formations provided by the various embodiments described above.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for characterizing the drillability of a gravel formation, characterized in that: The method comprises: Obtaining a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth; wherein the first mapping relationship is used to characterize the lithological sedimentation law of the gravel formation; Based on the logging interpretation data of the gravel formation, a second mapping relationship between the abrasiveness index of the rock in the gravel formation and the formation depth, and a third mapping relationship between the impact index and the formation depth are obtained; wherein the second mapping relationship is used to characterize the abrasiveness of the sandstone in the gravel formation, and the third mapping relationship is used to characterize the impact of the gravel in the gravel formation on the drill bit; Outputting the first mapping relationship, the second mapping relationship and the third mapping relationship; wherein the first mapping relationship, the second mapping relationship and the third mapping relationship are used to characterize the drillability of the gravel formation; The step of obtaining a second mapping relationship between the grinding index of the rock in the gravel formation and the formation depth based on the well logging interpretation data of the gravel formation includes: Obtaining the mudstone volume ratio of rocks at different formation depths according to the gamma values ​​of rocks at different formation depths in the well logging interpretation data; Obtaining the sandstone volume ratio of rocks at each formation depth according to the mudstone volume ratio of rocks at each formation depth, and the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the well logging interpretation data; According to the sandstone volume ratio of the rock at each formation depth and the acoustic wave time difference of the rock at each formation depth in the logging interpretation data, the grinding index of the rock at each formation depth is obtained; wherein the grinding index of the rock is positively correlated with the sandstone volume ratio of the rock; Acquire the second mapping relationship according to the grinding index of the rock at each formation depth; The method of obtaining the sandstone volume ratio of rocks at various formation depths according to the mudstone volume ratio of rocks at various formation depths, and the porosity, mudstone density, sandstone density, and fluid density of rocks at various formation depths in the well logging interpretation data, comprises: According to the porosity of the rock at each stratum depth, the pore volume ratio of the rock at each stratum depth is obtained; Obtaining the unit mass of the mudstone of the rock at each stratum depth according to the mudstone volume ratio of the rock at each stratum depth and the mudstone density; According to the porosity of the rock at each formation depth and the density of the fluid, the unit mass of the fluid in the pores of the rock at each formation depth is obtained; According to the pore volume percentage of the rock at each formation depth, the mudstone volume percentage of the rock at each formation depth, the unit mass of the mudstone of the rock at each formation depth, the unit mass of the fluid in the pores of the rock at each formation depth, the sandstone density, and the first constraint and the second constraint, the sandstone volume percentage of the rock at each formation depth is obtained; wherein the first constraint is that the sum of the pore volume percentage, sandstone volume percentage, mudstone volume percentage, and gravel volume percentage of the rock is equal to 1, and the second constraint is that the unit mass of the rock is equal to the sum of the unit mass of the fluid, the unit mass of the gravel, the unit mass of the sandstone, and the unit mass of the mudstone.

2. The method according to claim 1, characterized in that The step of obtaining a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth includes: receiving the mass of rock cuttings from different formation depths of the gravel formation, and the mass of calcium carbonate of the rock cuttings; The calcium carbonate content of the rock from each formation depth is obtained by dividing the calcium carbonate mass of the rock cuttings from each formation depth by the mass of the rock cuttings; The first mapping relationship is obtained according to the calcium carbonate content of the rocks from each stratum depth.

3. The method according to claim 1, characterized in that The method of obtaining the mudstone volume ratio of rocks at different formation depths according to the gamma values ​​of rocks at different formation depths in the logging interpretation data includes: Obtaining the mudstone index of rocks at different formation depths according to the gamma values ​​corresponding to different formation depths in the logging interpretation data; According to the mudstone index of the rock at each formation depth, the mudstone volume ratio of the rock at each formation depth is obtained.

4. The method according to claim 1, characterized in that: The method of obtaining the grinding index of the rock at each formation depth according to the sandstone volume ratio of the rock at each formation depth and the acoustic wave time difference of the rock at each formation depth in the well logging interpretation data comprises: The quotient of the sandstone volume ratio and the acoustic wave time difference of the rock at each formation depth is normalized to obtain the grinding index of the rock at each formation depth.

5. The method according to claim 1, characterized in that The step of obtaining the third mapping relationship between the impact index of the rock in the gravel formation and the formation depth based on the well logging interpretation data of the gravel formation includes: Obtaining the compressive strength of rocks at different formation depths according to the acoustic time difference of rocks at different formation depths in the well logging interpretation data; Obtaining the impact index of the rock at each stratum depth according to the difference in compressive strength between the rock at each stratum depth and the rock at the previous stratum depth, as well as the stratum depth difference; wherein the impact index of the rock is used to characterize the rate of change of the compressive strength of the rock; The third mapping relationship is acquired according to the impact index of the rock at each formation depth.

6. A device for characterizing the drillability of gravel formations, characterized in that: The device comprises: A first acquisition module is used to acquire a first mapping relationship between the calcium carbonate content of the rock in the gravel formation and the formation depth; wherein the first mapping relationship is used to characterize the lithological sedimentation law of the gravel formation; A second acquisition module is used to acquire a second mapping relationship between abrasiveness index and formation depth of the rock in the gravel formation, and a third mapping relationship between impact index and formation depth, based on the logging interpretation data of the gravel formation; wherein the second mapping relationship is used to characterize the abrasiveness of the sandstone in the gravel formation, and the third mapping relationship is used to characterize the impact of the gravel in the gravel formation on the drill bit; An output module, configured to output the first mapping relationship, the second mapping relationship, and the third mapping relationship; wherein the first mapping relationship, the second mapping relationship, and the third mapping relationship are used to characterize the drillability of the gravel formation; The second acquisition module is specifically used to obtain the mudstone volume ratio of rocks at different formation depths according to the gamma values ​​of rocks at different formation depths in the logging interpretation data; Obtaining the sandstone volume ratio of rocks at each formation depth according to the mudstone volume ratio of rocks at each formation depth, and the porosity, mudstone density, sandstone density, and fluid density of rocks at each formation depth in the well logging interpretation data; According to the sandstone volume ratio of the rock at each formation depth and the acoustic wave time difference of the rock at each formation depth in the logging interpretation data, the grinding index of the rock at each formation depth is obtained; wherein the grinding index of the rock is positively correlated with the sandstone volume ratio of the rock; Acquire the second mapping relationship according to the grinding index of the rock at each formation depth; The method of obtaining the sandstone volume ratio of rocks at various formation depths according to the mudstone volume ratio of rocks at various formation depths, and the porosity, mudstone density, sandstone density, and fluid density of rocks at various formation depths in the well logging interpretation data, comprises: According to the porosity of the rock at each stratum depth, the pore volume ratio of the rock at each stratum depth is obtained; Obtaining the unit mass of the mudstone of the rock at each stratum depth according to the mudstone volume ratio of the rock at each stratum depth and the mudstone density; According to the porosity of the rock at each formation depth and the density of the fluid, the unit mass of the fluid in the pores of the rock at each formation depth is obtained; According to the pore volume percentage of the rock at each formation depth, the mudstone volume percentage of the rock at each formation depth, the unit mass of the mudstone of the rock at each formation depth, the unit mass of the fluid in the pores of the rock at each formation depth, the sandstone density, and the first constraint and the second constraint, the sandstone volume percentage of the rock at each formation depth is obtained; wherein the first constraint is that the sum of the pore volume percentage, sandstone volume percentage, mudstone volume percentage, and gravel volume percentage of the rock is equal to 1, and the second constraint is that the unit mass of the rock is equal to the sum of the unit mass of the fluid, the unit mass of the gravel, the unit mass of the sandstone, and the unit mass of the mudstone.

7. An electronic device, characterized in that: include: at least one processor and memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the electronic device performs the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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