Method and device for determining collapse section of abandoned well of gas storage, equipment and storage medium

Abstract

The application provides a method, device and equipment for determining a collapse section of a waste well of a gas storage, and a storage medium. The method comprises the following steps: determining a collapse period, a three-pressure profile and a shale content of a well section of the waste well by collecting attribute parameters of the waste well; determining a first range of the collapse section of the waste well, a second range of the collapse section of the waste well and a third range of the collapse section of the waste well according to the collapse period, the three-pressure profile and the shale content of the well section of the waste well; and finally determining a distribution range of the collapse section of the waste well according to the first range, the second range and the third range of the collapse section of the waste well. The method improves the accuracy of the estimation of the collapse section of the waste well of the gas storage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil exploration, and particularly relates to a method, device and equipment for determining a collapse section of a depleted well of a gas storage and a storage medium. BACKGROUND

[0002] After a long time of soaking, the well wall of the open hole depleted well may collapse, and the collapse deposits formed by the collapse section and the fluid mixed and compacted for a certain time have a certain sealing capacity. However, whether the sealing capacity of the collapse material can meet the construction requirements of the gas storage needs to be further determined. In order to ensure the sealing property of the open hole depleted well, effectively prevent gas channeling due to poor sealing capacity of the depleted well deposits, and ensure the geological body integrity and long-term safe operation of the depleted oil and gas reservoir type gas storage, the sealing capacity of the collapse material needs to be further tested. Because the sealing capacities of different types of collapse deposits are different, the collapse horizon of the collapse material and the composition of the collapse material in the wellbore need to be predicted before the sealing capacity experiment of the wellbore collapse material is performed.

[0003] In the prior art, the range of the collapse section is mainly determined according to the caliper logging data in the well logging data of each well section of the depleted well. At present, the range of the expansion section is determined as the collapse section of the depleted well by judging the expansion section of the wellbore through the caliper logging data.

[0004] However, because the well section that has not been expanded may also collapse during a long time of depletion of the depleted well, the determination of the collapse section of the depleted well through only the range of the expansion section in the prior art is not accurate enough. SUMMARY

[0005] The present application provides a method, device and equipment for determining a collapse section of a depleted well of a gas storage and a storage medium to solve the problem of inaccurate determination of the collapse section of the depleted well of the gas storage.

[0006] In one aspect, the present application provides a method for determining a collapse section of a depleted well of a gas storage, comprising:

[0007] obtaining attribute parameters of the depleted well, and determining a collapse period, a three-pressure profile and a well section shale content of the depleted well according to the attribute parameters;

[0008] determining a first range of the collapse section of the depleted well according to the collapse period of the depleted well, a second range of the collapse section of the depleted well according to the three-pressure profile of the depleted well, and a third range of the collapse section of the depleted well according to the well section shale content of the depleted well;

[0009] estimating a target collapse section of the depleted well according to the determined first range, second range and third range.

[0010] In a second aspect, the present application provides a device for determining a collapse section of a depleted well of a gas storage, comprising:

[0011] a obtaining module, configured to obtain attribute parameters of the depleted well, and determine a collapse period, a three-pressure profile and a shale content of a well section of the depleted well according to the attribute parameters;

[0012] a calculating module, configured to determine a first range of the collapse section of the depleted well according to the collapse period of the depleted well, determine a second range of the collapse section of the depleted well according to the three-pressure profile of the depleted well, and determine a third range of the collapse section of the depleted well according to the shale content of the well section of the depleted well;

[0013] a determining module, configured to estimate a target collapse section of the depleted well according to the determined first range, second range and third range.

[0014] In a third aspect, the present application provides a device for determining a collapse section of a depleted well of a gas storage, comprising:

[0015] a memory, a processor and a communication interface;

[0016] the memory is configured to store executable instructions of the processor;

[0017] wherein the processor is configured to execute the executable instructions to perform the method for determining a collapse section of a depleted well of a gas storage according to the first aspect.

[0018] In a fourth aspect, the present application provides a readable storage medium, comprising:

[0019] the computer program is executed by the processor to perform the method for determining a collapse section of a depleted well of a gas storage according to the first aspect.

[0020] The method, device, equipment and storage medium for determining a collapse section of a depleted well of a gas storage provided by the present application collect attribute parameters of the depleted well to determine the collapse period, three-pressure profile and shale content of the well section of the depleted well, and determine a first range of the collapse section of the depleted well, a second range of the collapse section of the depleted well and a third range of the collapse section of the depleted well according to the related features, and finally determine the distribution range of the collapse section of the depleted well according to the first range, second range and third range, which increases the method for determining the range of the collapse section and improves the accuracy of the judgment of the range of the collapse section of the depleted well. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1This is a schematic diagram of the method for determining the collapsed section of an abandoned well in a gas storage facility, provided in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the process of obtaining the attribute parameters of abandoned wells and determining the collapse cycle, three-pressure profile and mud content of the well section based on the attribute parameters, provided by the embodiments of the present invention.

[0024] Figure 3 This is a distribution diagram of well section collapse cycles provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the process for predicting and verifying the extent of collapse in abandoned wells provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the process for verifying the predicted range of the collapsed section of an abandoned well, provided in an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the process for determining the mud content of abandoned well sections provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of a device for determining the collapsed section of an abandoned well in a gas storage facility, provided in an embodiment of the present invention.

[0029] Figure 8 A schematic diagram of a device for determining the collapsed section of an abandoned well in a gas storage facility, provided as an embodiment of this application.

[0030] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] Figure 1 This is a schematic diagram of the method for determining the collapsed section of an abandoned well in a gas storage facility according to the first embodiment of the present invention.

[0033] like Figure 1 As shown, the method for determining the collapsed section of an abandoned well in a gas storage facility in this embodiment may include the following steps:

[0034] S101, acquire attribute parameters of the abandoned well, and determine a collapse period, a three-pressure profile, and a shale content of a well section of the abandoned well according to the attribute parameters;

[0035] Specifically, the attribute parameters of the abandoned well are data collected in the original development process of the abandoned well of the gas storage, and can include attribute parameters of the abandoned well itself, such as size specification data, and can also include development parameters related to the development process of the well. In the method for determining the collapse section of the abandoned well of the gas storage provided in this embodiment, by analyzing and calculating the attribute parameters of the abandoned well, the collapse period, the three-pressure profile, and the shale content of the well section of the abandoned well, and other related characteristics of the well section of the abandoned well can be determined.

[0036] Further, the distribution of the collapse section of the abandoned well can be predicted according to the collapse period, the three-pressure profile, and the shale content of the well section of the abandoned well, and other related characteristics of the well section of the abandoned well.

[0037] S102, determine a first range of the collapse section of the abandoned well according to the collapse period of the abandoned well.

[0038] Part of the well section of the abandoned well of the gas storage is soaked in a mixed liquid composed of drilling fluid and other liquids, and when the soaking time of the well section of the abandoned well exceeds a certain time limit, the well section of the abandoned well is prone to collapse. The soaking time of the abandoned well of the gas storage can be determined as the collapse period of the well section of the abandoned well.

[0039] In this embodiment, the actual soaking time of the well section of the abandoned well is compared with the collapse period of the well section of the abandoned well, and when the actual soaking time of the well section of the abandoned well is greater than the collapse period of the well section of the abandoned well, the well section of the abandoned well is prone to collapse, and the well section can be determined as the first range of the collapse section of the abandoned well. S103, determine a second range of the collapse section of the abandoned well according to the three-pressure profile of the abandoned well.

[0040] The three pressures of the abandoned well refer to the pore pressure of the well section of the abandoned well, the fracture pressure of the well section of the abandoned well, and the collapse pressure of the well section of the abandoned well. The three-pressure profile of the abandoned well can be obtained by analyzing the attribute parameters of the abandoned well, and the collapse pressure and the mud weight corresponding to the well section of the abandoned well can be obtained according to the three-pressure profile of the abandoned well.

[0041] In this embodiment, the collapse pressure and the mud weight corresponding to the well section of the abandoned well are compared, and when the collapse pressure of the well section of the abandoned well is greater than or equal to the mud weight, the well section is prone to collapse, and the well section can be determined as the second range of the collapse section of the abandoned well. S104, determine a third range of the collapse section of the abandoned well according to the shale content of the well section of the abandoned well.

[0042] Specifically, since the wellbore is more prone to collapse when the mudstone or shale content is high during the abandonment of the abandoned well, the distribution range of the collapse section of the abandoned well can be predicted by the shale content of different well sections. In the embodiment, the shale content of the abandoned well can be calculated by various methods, such as a natural gamma-ray spectrometry method or a natural potential method.

[0043] In the embodiment, a threshold of the shale content can be set. When the shale content of a well section of the abandoned well is greater than or equal to the threshold, the well section is prone to collapse, and the well section can be determined as the third range of the collapse section of the abandoned well.

[0044] S105, estimating the collapse target section of the abandoned well according to the first range, the second range and the third range.

[0045] In the embodiment, the first range of the collapse section of the abandoned well is determined according to the collapse period of the abandoned well, the second range of the collapse section of the abandoned well is determined according to the three-pressure profile of the abandoned well, and the third range of the collapse section of the abandoned well is determined according to the shale content of the well section of the abandoned well. The collapse target section of the abandoned well is determined by comprehensively determining the three ranges. The three ranges obtained by the above S103-S105 can be compromised to determine the final collapse target section. Specifically, the intersection of the ranges obtained by two of the above three methods can be taken, and the range obtained by the remaining one method can be referred to. The intersection of the ranges obtained by the three methods can also be taken. Thus, the accuracy of the prediction of the collapse section of the abandoned well is improved, and a more reliable basis for the analysis of the integrity and safety of the abandoned well is provided.

[0046] The method for determining the collapse section of the abandoned well of the gas storage provided in the embodiment comprises the following steps: collecting attribute parameters of the abandoned well to determine the collapse period, the three-pressure profile and the shale content of the well section of the abandoned well; determining the first range of the collapse section of the abandoned well according to the collapse period of the abandoned well, the second range of the collapse section of the abandoned well according to the three-pressure profile of the abandoned well, and the third range of the collapse section of the abandoned well according to the shale content of the well section of the abandoned well; and finally determining the distribution range of the collapse section of the abandoned well according to the first range, the second range and the third range. In the above process of determining the collapse section of the abandoned well of the gas storage, the three ranges of the collapse section determined by the collapse period, the three-pressure profile and the shale content of the well section of the abandoned well improve the accuracy of the judgment of the collapse section of the abandoned well.

[0047] Figure 2 is a flowchart of the process of acquiring the attribute parameters of the abandoned well and determining the collapse period, the three-pressure profile and the shale content of the well section of the abandoned well according to the attribute parameters provided in the second embodiment of the present application. In Figure 1 On the basis of the embodiment shown in the figure, the embodiment provides a specific embodiment of acquiring the attribute parameters of the abandoned well and determining the collapse period, the three-pressure profile and the shale content of the well section of the abandoned well according to the attribute parameters.

[0048] AsFigure 2 As shown, the obtaining of the attribute parameter of the abandoned well, and the determination of the collapse period, the three-pressure profile and the shale content of the well section of the abandoned well according to the attribute parameter can include the following steps:

[0049] S201, obtaining an attribute parameter of an abandoned well.

[0050] Specifically, the attribute parameter of the abandoned well includes one or more of the following: wellbore depth of the abandoned well, drill bit diameter of the abandoned well, abandonment time of the abandoned well, logging data of the abandoned well, and drilling core of the abandoned well.

[0051] Among them, the future period available parameters and safety related parameters of the abandoned well wellbore can be estimated in combination with the attribute parameters of the abandoned well itself. First, the future period available parameters of the abandoned well can be estimated. The wellbore depth and the target depth of the gas storage layer in the attribute parameter can be used to determine whether the abandoned well meets the requirements of the gas storage, for example, in this embodiment, the wellbore depth is 2300m, which is greater than the target depth of the gas storage layer, 1600m, and meets the requirements of the gas storage. Secondly, the safety related parameters of the abandoned well can also be estimated. If the abandonment time of the abandoned well is too long, the safety factor is relatively low, and the reutilization is not considered. For example, in this embodiment, the abandonment time of the abandoned well is 5 years, which meets the requirements of the preliminary safety analysis. In addition, according to the attribute parameters of the abandoned well itself, the estimated collapse section vertical depth range can be obtained, for example: in this embodiment, the estimated collapse section vertical depth is 560-650m, 900-1050m, 1090m-1170m and 1200-2000m. The estimated collapse section vertical depth range can be referred to for further prediction of the collapse section of the abandoned well.

[0052] S202, determining the collapse period of the abandoned well according to the attribute parameter of the abandoned well.

[0053] Specifically, the balance ratio of the abandoned well can be calculated according to the bottom layer lithology of the well section, the drilling fluid density of the well section and the formation pressure of the well section in the well logging data of the abandoned well, and the collapse period of the abandoned well can be determined according to the balance ratio of the abandoned well.

[0054] Among them, some well sections of the abandoned well of the gas storage are soaked in a mixed liquid composed of drilling fluid and other liquids, and the well diameter expansion rate of the well section increases with the increase of the soaking time of the well section. When the well diameter expansion rate increases by a certain value, it can be judged that the well section collapses, that is, the well diameter expansion rate determines the collapse period of the well section. And the well diameter expansion rate is also affected by the balance ratio of the well section. The balance ratio is specifically the ratio of the drilling fluid density to the formation pressure, which is related to the formation lithology, the drilling fluid density and the formation pressure of the well section. The well section collapse period distribution map can be obtained by comparing the graph, that is, the change of the well diameter expansion rate with the soaking time under different balance ratios, as shown in Figure 3 ​

[0055] In the embodiment, first, the collapsed well section, for example, the 1200-1700 m well section, immersed in the mixed liquid composed of the drilling fluid and the like can be selected, and the balance ratio of the well section is calculated, for example, in the embodiment, the drilling fluid used in the 1200-1700 m well section is the silicon-based anti-collapse drilling fluid with a density of 1.15 g / cm3, and the formation pressure of the section is 1.2 g / cm3, and according to the formula, the balance ratio of the well section is 0.95; then, the hole diameter enlargement rate curve of the well section under the balance ratio, for example, 0.95, in the collapse period distribution diagram is observed; wherein the hole diameter enlargement rate increases with the increase of the immersion time, and when the hole diameter enlargement rate increases by a certain value, for example, 17%, it can be judged that the well section collapses, and the immersion time of the well section corresponding to the hole diameter enlargement rate is the collapse period of the well section, for example, 25 days.

[0056] S203, determining the three-pressure profile of the abandoned well according to the attribute parameter of the abandoned well.

[0057] Specifically, the three-pressure value of the well section of the abandoned well can be obtained according to the drill bit diameter of the abandoned well, and the three-pressure profile of the abandoned well can be generated according to the corresponding relationship between the three-pressure value of the well section of the abandoned well and the mud weight of the well section in the well logging data of the abandoned well, wherein the three-pressure value of the well section of the abandoned well includes the pore pressure of the well section of the abandoned well, the fracture pressure of the well section of the abandoned well and the collapse pressure of the well section of the abandoned well.

[0058] wherein the pore pressure and the fracture pressure are mainly related to the attribute parameter of the abandoned well, for example, the drill bit diameter, and the collapse pressure of the abandoned well can be obtained by calculating the pore pressure and the fracture pressure. In combination with the relationship between the mud weight and the three-pressure of the abandoned well, the three-pressure profile of the abandoned well can be obtained. Further, the size relationship between the well section collapse pressure and the mud weight can be judged according to the three-pressure profile of the abandoned well.

[0059] S204, determining the shale content of the well section of the abandoned well according to the attribute parameter of the abandoned well.

[0060] Specifically, the shale content of the well section of the abandoned well can be calculated by using the natural gamma-ray spectroscopy method and the natural potential method according to the natural gamma-ray in the well logging data of the abandoned well and the natural potential abnormal value in the well logging data.

[0061] The process provided by the embodiment for obtaining the attribute parameter of the abandoned well, determining the collapse period, the three-pressure profile and the shale content of the well section of the abandoned well provides multiple judgment bases for the determination of the collapsed section of the abandoned well, and further improves the accuracy of the judgment of the collapsed section of the abandoned well.

[0062] Figure 4 is the process flow diagram of the range prediction and verification process of the collapsed section of the abandoned well provided by the third embodiment of the present application. In the process, the attribute parameter of the abandoned well is obtained, the three-pressure profile of the abandoned well is determined, the shale content of the well section of the abandoned well is determined, the range of the collapsed section of the abandoned well is predicted, and the range of the collapsed section of the abandoned well is verified. Figure 1Based on the embodiment, the embodiment provides a specific implementation process for determining the range of the collapse section in three ways, as shown in the following table: Figure 4 As shown in the table, the process for predicting and verifying the range of the collapse section of the abandoned well in the embodiment can include the following steps:

[0063] S401. Determine the first range of the collapse section of the abandoned well according to the collapse period of the abandoned well.

[0064] Specifically, first, estimate the soaking duration of the well section of the abandoned well according to the abandonment duration of the abandoned well. The actual soaking duration of the well section is the actual soaking duration of the well section in the mixed liquid composed of drilling fluid and other liquids, and in this embodiment, the actual soaking duration is approximately equal to the abandonment time of the abandoned well. Second, determine the first range of the collapse section of the abandoned well as the well section of the abandoned well whose soaking duration is greater than the collapse period of the abandoned well, that is, the depth range of the well section is the range of the collapse section of the abandoned well, for example, 1200-1700 m.

[0065] S402. Determine the second range of the collapse section of the abandoned well according to the three-pressure profile of the abandoned well.

[0066] Analyze the three-pressure profile of the abandoned well, and determine the second range of the collapse section of the abandoned well as the well section of the abandoned well whose collapse pressure is greater than the mud weight of the well section in the well logging data of the abandoned well.

[0067] Specifically, when the collapse pressure of the well section is greater than or equal to the mud weight, the well section is prone to collapse, that is, the depth range of the well section is the range of the collapse section of the abandoned well. In this embodiment, mainly observe the size relationship between the collapse pressure and the mud weight of the abandoned well in the three-pressure profile. Select the depth range of the well section, for example, 1450-1700 m, whose collapse pressure is greater than or equal to the mud weight, as the range of the collapse section of the abandoned well.

[0068] S403. Determine the third range of the collapse section of the abandoned well according to the shale content of the well section of the abandoned well.

[0069] Determine the third range of the collapse section of the abandoned well as the well section of the abandoned well whose shale content is greater than a set threshold.

[0070] Specifically, since the wellbore is more prone to collapse when the shale or shale content is high during the abandonment of the abandoned well, the range of the collapse section of the abandoned well can be predicted by the shale content of different well sections. This embodiment uses the natural gamma-ray spectrometry and the natural potential method to comprehensively judge the shale content of different wellbore collapse sections. The well section whose shale content is greater than a certain value, for example, 70%, is prone to collapse, and it can be determined that the well section is the range of the collapse section of the abandoned well. For example, in this embodiment, the shale content of the well section with a depth range of 1200-2000 m is greater than 70%, and it can be determined that the depth range of 1200-2000 m is the distribution range of the collapse section of the abandoned well.

[0071] S404, estimate the collapse target section of the abandoned well according to the determined first range, second range and third range.

[0072] The intersection of the first range, the second range and the third range is determined as the collapse target section of the abandoned well. For example, in the embodiment, the first range of the collapse section of the abandoned well is 1200-1700m according to the abandoned well collapse period; the second range of the collapse section of the abandoned well is 1450-1700m according to the abandoned well three-pressure profile; and the third range of the collapse section of the abandoned well is 1200-2000m according to the shale content of the abandoned well section. The intersection of the above three collapse section ranges is extracted to further estimate the range of the collapse section of the abandoned well, which is 1450-1700m.

[0073] Further, the embodiment also provides a verification process of the prediction result of the range of the collapse section of the abandoned well, which improves the accuracy of the prediction result of the range of the collapse section of the abandoned well, and see S405:

[0074] S405, verify the rationality of the distribution of the collapse target section of the abandoned well by analyzing and predicting the composition of the collapse target section of the abandoned well.

[0075] After estimating the collapse target section of the abandoned well according to the determined first range, second range and third range, the method further includes verifying the rationality of the distribution of the collapse target section of the abandoned well by analyzing and predicting the composition of the collapse target section of the abandoned well.

[0076] Specifically, the embodiment can analyze the composition and characteristics of the collapsed matter in the above-mentioned collapse section of the abandoned well, predict the collapse probability of the collapse section, verify the distribution of the collapse section of the abandoned well, and improve the accuracy of the judgment of the collapse section of the abandoned well.

[0077] The range prediction and verification process of the collapse section of the abandoned well provided by the embodiment increases the verification process of the prediction of the range of the collapse section of the abandoned well on the basis of the above-mentioned embodiment. By analyzing the composition and characteristics of the collapsed matter in the above-mentioned predicted collapse section of the abandoned well, the collapse probability of the collapse section is predicted, the distribution of the collapse section of the abandoned well is verified, and the accuracy of the judgment of the collapse section of the abandoned well is improved.

[0078] Figure 5 is a flowchart of the verification process of the prediction result of the range of the collapse section of the abandoned well provided by the fourth embodiment of the present application. In Figure 4 On the basis of the embodiment, the embodiment provides a specific embodiment of the prediction and analysis of the composition of the collapsed matter.

[0079] As Figure 5 shown, the verification process of the prediction result of the range of the collapse section of the abandoned well of the embodiment includes the following steps:

[0080] Step S501, screening the core and downhole debris of the collapse section of the abandoned well, and making X-ray diffraction measurement samples.

[0081] Specifically, for the range of the collapse section of the abandoned well predicted in Embodiment 1, the composition of the collapse in the collapse section needs to be predicted and analyzed. The core and downhole debris collected in the early stage of the abandoned well can be used to screen the rock and debris samples of the collapse section for analysis.

[0082] First, the sample to be tested is pretreated. The sorted sample to be tested is placed in an electric heating drying box and dried at a temperature lower than a certain temperature, for example, 60℃. After cooling to room temperature, it is ready for use. A certain amount of sample to be tested, for example, 1-2g, is crushed to a particle size less than a certain value, for example, 1mm, by a sample crusher or a copper mortar. The crushed sample is ground in a grinder or a corundum mortar to a particle size less than a certain value, for example, 40um. Then, the measurement tablet is made. The measurement tablet can be made by back pressure method. A sample frame of a certain material, for example, aluminum, is placed on a flat ground glass so that it is tightly attached. Then, the prepared powder sample is loaded into a certain size, for example, 20mm x 18mm, empty frame by a sample spoon, and is vertically compressed and formed. The lower side of the measurement tablet can be used as the test surface.

[0083] Step S502, X-ray diffraction analysis of the test sample is performed to obtain the mineral types and contents in the collapse.

[0084] In this embodiment, the rock in the collapse section is composed of granular minerals and clay minerals. The types and contents of the granular minerals and clay minerals can be obtained by mineral X-ray diffraction analysis. The average content of each type of mineral can be obtained by calculation. The above analysis results of mineral types and contents can provide a basis for the selection of the type of filling sediment in the wellbore collapse sediment sealing evaluation experiment, which can effectively ensure the smooth construction and safe operation of the gas storage in the later period.

[0085] As shown in Table 2, the mineral X-ray diffraction analysis results of the 1450m-1700m well section are shown.

[0086] Table 2

[0087]

[0088]

[0089] As shown in Table 3, the clay mineral X-ray diffraction analysis results of the 1450m-1700m well section are shown.

[0090] Table 3

[0091]

[0092] Step S503: analyzing the composition of the collapse material according to the clay mineral hydration expansion capacity, estimating the collapse probability of the collapse section of the abandoned well, and verifying the range of the collapse section of the abandoned well.

[0093] Specifically, the collapse section rock is composed of granular minerals and clay minerals, in which the content of the clay minerals is relatively high and the content of the granular minerals is relatively small. The granular minerals in each well section mainly include quartz, feldspar, calcite, dolomite and mica, etc. It can be known from the average value that the content of quartz is the highest, followed by feldspar, and the contents of other granular minerals are not much different.

[0094] The volume of the clay mineral will increase after absorbing water, and the hydration expansion capacity is an index for measuring the hydrophilicity of the clay mineral. The stronger the hydrophilicity is, the greater the water absorption is, and the more serious the hydration expansion is. The hydration expansion capacity of the clay is in the order of montmorillonite > illite > kaolinite > chlorite from large to small. The higher the content of the clay mineral with large hydration expansion capacity is in the well section of the abandoned well, the more likely the collapse of the well section is, and therefore the depth range of the well section with high content of the clay mineral with large hydration expansion capacity can be determined as the range of the collapse section of the abandoned well. Specifically, the analysis result of the mineral X-ray diffraction analysis is analyzed according to the hydration expansion capacity of the clay mineral. In the estimated collapse section of the embodiment, the content of the clay mineral is relatively high. The total content of the clay mineral in each well section is about 61.7-86.5%, and the average content is 76.04%. The clay mineral mainly includes illite, kaolinite and green montmorillonite, in which the content of the green montmorillonite is the largest, about 74-80%, and the contents of the illite and the kaolinite are relatively small.

[0095] It can be known from the comprehensive analysis of the mineral X-ray diffraction analysis result and the hydration expansion capacity of the clay mineral that the content of the green montmorillonite with large hydration expansion capacity is relatively high in the clay mineral of the estimated collapse section, and the illite and the kaolinite with relatively small content also have large hydration expansion capacity. Therefore, it can be inferred that the possibility of the collapse of the estimated collapse section is relatively large, and the range of the collapse section of the abandoned well is verified to be the depth range of 1450-1700m.

[0096] The embodiment first predicts the composition of the collapse material of the above determined collapse section of the abandoned well, and then obtains the collapse probability of the collapse section of the abandoned well by analyzing the prediction result of the composition of the collapse material, further verifies the distribution of the collapse section range of the abandoned well of the gas storage, improves the accuracy of the judgment of the collapse section of the abandoned well of the gas storage, and provides a basis for the type selection of the filled sediment in the evaluation experiment of the sealing property of the wellbore collapse sediment, effectively guarantees the smooth construction and the safety of the later operation of the gas storage.

[0097] Figure 6 is a flowchart for judging the shale content of the well section of the abandoned well provided in the fifth embodiment of the present application. Figure 4Based on the embodiment shown, the embodiment provides a specific embodiment for comprehensively judging the shale content of different wellbore collapse sections by using the natural gamma-ray spectrum method and the natural potential method.

[0098] As shown in Figure 6 The shale content judgment of the abandoned well section of the embodiment includes the following steps:

[0099] Step S601, calculating the shale content of the abandoned well section by using the natural gamma-ray spectrum method.

[0100] Specifically, when the natural gamma-ray spectrum method is used to calculate the shale content, it is required that other substances in the reservoir except shale do not contain radioactive minerals. The shale content V of the abandoned well section is calculated by formula (1): SH Through formula (2), we get:

[0101]

[0102]

[0103] In formula (1), SH is the relative value of the natural gamma-ray of the target well section, GR is the natural gamma-ray logging reading value of the target well section, GR min and GR max are the natural gamma-ray values of pure sandstone and pure mudstone layers, respectively.

[0104] In formula (2), GCUR is an empirical coefficient related to the formation, which is related to the formation age. Compared with the tertiary system formation, the new formation GCUR=3.7, and the old formation GCUR=2.

[0105] Step S602, calculating the shale content of the abandoned well section by using the natural potential method.

[0106] Specifically, when the natural potential method is used to calculate the shale content, it is required that the formation water resistivity remains unchanged, and the shale in the reservoir is the same as the composition of the adjacent mudstone. The shale content V of the abandoned well section is calculated by formula (3): SH Through formula (3), we get:

[0107]

[0108] In formula (3), SP is the natural potential anomaly of the target well section, and SSP is the maximum natural potential anomaly of the pure water layer in the target well section.

[0109] Step S603, comprehensively calculating the shale content of the abandoned well section by using the natural gamma-ray spectrum method and the natural potential method, and judging the range of the abandoned well collapse section.

[0110] In order to make the calculation result of the shale content more accurate, the natural gamma-ray spectrometry and the natural electric potential method can be used to calculate the shale content of the target well section respectively, and then the average value of the two shale content values is taken as the shale content value of the well section. When the shale content of the target well section is greater than a certain value, for example, 70%, the depth range of the well section is prone to collapse, that is, the depth range of the well section is the range of the abandoned well collapse section. For example, in the embodiment, the shale content of the well section with the depth range of 1200-2000m is greater than 70%, and it can be judged that the depth range of 1200-2000m is the range of the abandoned well collapse section in the embodiment.

[0111] As shown in Table 1, the shale content of each estimated collapse section of the abandoned well in the embodiment is shown.

[0112] Table 1

[0113] Wellbore depth range (m) Shale content (%) Sand (%) 560～650 23.19 76.81 900～1050 38.31 61.69 1090～1170 55.17 44.83 1200～2000 84.04 15.96

[0114] In the embodiment, the natural gamma-ray spectrometry and the natural electric potential method are used to comprehensively calculate the shale content of the well section of the abandoned well, which comprehensively considers the requirements of the two calculation methods for the well section of the abandoned well, so that the calculation result of the shale content is more accurate, and provides a more accurate basis for judging the collapse section of the abandoned well.

[0115] Figure 7 Fig. 6 is a structural schematic diagram of a device for determining the collapse section of the abandoned well of the gas storage provided in the sixth embodiment of the present application.

[0116] As shown in Fig. 6, the device 70 for determining the collapse section of the abandoned well of the gas storage in the embodiment includes an acquisition module 71, a calculation module 72 and a determination module 73. Figure 7 The acquisition module 71 is used to acquire the attribute parameters of the abandoned well, and determine the collapse period, the tri-pressure profile and the shale content of the well section of the abandoned well according to the attribute parameters.

[0117] The calculation module 72 is used to determine the first range of the collapse section of the abandoned well according to the collapse period of the abandoned well, determine the second range of the collapse section of the abandoned well according to the tri-pressure profile of the abandoned well, and determine the third range of the collapse section of the abandoned well according to the shale content of the well section of the abandoned well.

[0118] The determination module 73 is used to estimate the collapse target section of the abandoned well according to the determined first range, second range and third range.

[0119] The device provided in the embodiment can be used to execute the technical solutions of the method embodiments

[0120] above, and the implementation principles and technical effects are similar, which will not be described here in detail. Figures 1 to 6

[0121] Figure 8 ​A structural schematic of a gas storage abandoned well collapse section determination device provided for an eighth embodiment of the present application is shown.

[0122] As shown in Figure 8 The gas storage abandoned well collapse section determination device 80 of the present embodiment includes a processor 81, a memory 82, and a communication interface 83.

[0123] The memory 82 is configured to store executable instructions of the processor;

[0124] The processor 81 is configured to execute the above method embodiments Figures 1 to 6 of any one of the above method embodiments of the gas storage abandoned well collapse section determination method.

[0125] The present application further provides a readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the above method embodiments Figures 1 to 6 Figures 1 to 6 of any one of the above method embodiments of the gas storage abandoned well collapse section determination method.

[0126] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only and the true scope and spirit of the application is indicated by the following claims. It will be appreciated by those skilled in the art that changes could be made to the application described and illustrated herein without departing from the essential scope thereof. In particular, it is a feature of the application that all such modifications and variations are intended to be included herein as falling within the scope of the application. The application described and claimed herein is intended to be broadly practiced, not limited to any one specific embodiment disclosed.

[0127] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be defined by the claims appended hereto.

Claims

1. A method for determining the collapsed section of an abandoned well in a gas storage facility, characterized in that, include: Obtain the attribute parameters of the abandoned well, and determine the collapse cycle, three-pressure profile, and mud content of the well section based on the attribute parameters; the attribute parameters include one or more of the following: wellbore depth of the abandoned well, drill bit diameter of the abandoned well, abandonment duration of the abandoned well, logging data of the abandoned well, and drilling core of the abandoned well; The first range of the abandoned well collapse section is determined based on the collapse cycle of the abandoned well, the second range of the abandoned well collapse section is determined based on the three pressure profile of the abandoned well, and the third range of the abandoned well collapse section is determined based on the mud content of the abandoned well section. Estimate the target collapse segment of the abandoned well based on the determined first range, second range, and third range; The process of determining the collapse cycle, three-pressure profile, and clay content of the abandoned well based on the attribute parameters includes: The balance ratio of the abandoned well is calculated based on the bottom lithology, drilling fluid density, and formation pressure of the well section from the well logging data, and the collapse cycle of the abandoned well is determined based on the balance ratio of the abandoned well. The three pressure values ​​of the abandoned well section are obtained based on the drill bit diameter of the abandoned well. Based on the correspondence between the three pressure values ​​of the abandoned well section and the mud weight of the section in the well logging data of the abandoned well, a three pressure profile of the abandoned well is generated. The three pressure values ​​of the abandoned well section include: pore pressure, fracture pressure, and collapse pressure of the abandoned well section. Based on the natural gamma ray and spontaneous potential anomaly values ​​in the well logging data of the abandoned well, the clay content of the well section of the abandoned well is calculated using the natural gamma ray spectroscopy method and the spontaneous potential method. Determining the first range of the collapsed section of the abandoned well based on the collapse cycle of the abandoned well includes: The soaking time of the abandoned well section is estimated based on the duration of its abandonment. The section of the abandoned well whose soaking time is greater than the collapse cycle of the abandoned well is defined as the first range of the collapsed section of the abandoned well; The determination of the second range of the collapsed section of the abandoned well based on the three-pressure profile of the abandoned well includes: The three-pressure profile of the abandoned well is analyzed, and the abandoned well section in which the collapse pressure is greater than the mud weight in the well logging data is determined as the second range of the abandoned well collapse section; The determination of the third range of the collapsed section of the abandoned well based on the mud content of the abandoned well section includes: The abandoned well section with a mud content greater than a set threshold is defined as the third range of the abandoned well collapse section.

2. The method according to claim 1, characterized in that, The step of estimating the target collapse segment of the abandoned well based on the determined first range, second range, and third range includes: The intersection of the first range, the second range, and the third range is determined as the target section for the collapse of the abandoned well.

3. The method according to claim 1, characterized in that, After estimating the target collapse segment of the abandoned well based on the determined first range, second range, and third range, the method further includes: The composition of the collapsed target section of the abandoned well is analyzed, and the rationality of the distribution of the collapsed target section of the abandoned well is verified based on the composition.

4. A device for determining the collapsed section of an abandoned well in a gas storage facility, characterized in that, include: The acquisition module is used to acquire the attribute parameters of the abandoned well, and determine the collapse cycle, three-pressure profile, and mud content of the well section of the abandoned well based on the attribute parameters; the attribute parameters include one or more of the following: wellbore depth of the abandoned well, drill bit diameter of the abandoned well, abandonment duration of the abandoned well, logging data of the abandoned well, and drilling core of the abandoned well; The calculation module is used to determine the first range of the abandoned well collapse section based on the collapse cycle of the abandoned well, the second range of the abandoned well collapse section based on the three pressure profile of the abandoned well, and the third range of the abandoned well collapse section based on the mud content of the abandoned well section. A determination module is used to estimate the target collapse segment of the abandoned well based on the determined first range, second range, and third range; The acquisition module is also used for: The balance ratio of the abandoned well is calculated based on the bottom lithology, drilling fluid density, and formation pressure of the well section from the well logging data, and the collapse cycle of the abandoned well is determined based on the balance ratio of the abandoned well. The three pressure values ​​of the abandoned well section are obtained based on the drill bit diameter of the abandoned well. Based on the correspondence between the three pressure values ​​of the abandoned well section and the mud weight of the section in the well logging data of the abandoned well, a three pressure profile of the abandoned well is generated. The three pressure values ​​of the abandoned well section include: pore pressure, fracture pressure, and collapse pressure of the abandoned well section. Based on the natural gamma ray and spontaneous potential anomaly values ​​in the well logging data of the abandoned well, the clay content of the well section of the abandoned well is calculated using the natural gamma ray spectroscopy method and the spontaneous potential method. The computing module is also used for: The soaking time of the abandoned well section is estimated based on the duration of its abandonment. The section of the abandoned well whose soaking time is greater than the collapse cycle of the abandoned well is defined as the first range of the collapsed section of the abandoned well; The three-pressure profile of the abandoned well is analyzed, and the abandoned well section in which the collapse pressure is greater than the mud weight in the well logging data is determined as the second range of the abandoned well collapse section; The abandoned well section with a mud content greater than a set threshold is defined as the third range of the abandoned well collapse section.

5. A device for determining the collapsed section of an abandoned well in a gas storage facility, characterized in that, include: Memory, processor, communication interface; The memory is used to store the executable instructions of the processor; The processor is configured to execute the method for determining the collapsed section of an abandoned well in a gas storage facility according to any one of claims 1 to 3 by executing the executable instructions.

6. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the collapsed section of an abandoned well in a gas storage facility as described in any one of claims 1 to 3.

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