A method, device and storage medium for detecting seepage in fractured rock mass with water curtain holes

Abstract

The present invention relates to the technical field of seepage detection, and provides a method, device and storage medium for detecting seepage in a water curtain hole fractured rock mass. When the inner wall of an oil storage cavern has a seepage area that meets the seepage conditions, a potential associated water curtain hole above the seepage area that has a water conduction association relationship with the seepage area is determined. When the potential associated water curtain hole is a target abnormal water curtain hole, a preliminary water conduction structure between the seepage area and the target abnormal water curtain hole is preliminarily determined, and the geological structure development information in the hole of the target abnormal water curtain hole is obtained. The abnormal interval in the hole is determined according to the geological structure development information in the hole, and the target water conduction structure between the seepage area and the abnormal interval in the hole is determined, and the target water conduction structure is used as the target area for seepage control treatment. The present application can accurately and quickly detect the specific location of the water curtain hole water conduction structure and its permeability characteristics and grouting characteristics, so as to carry out local grouting treatment of the water conduction fracture through the water curtain hole in a targeted manner, and effectively control the water seepage amount of the oil storage cavern.

Description

Technical Field

[0001] The invention relates to the technical field of seepage detection, in particular to a method, equipment and storage medium for detecting seepage in a water curtain hole fractured rock mass. Background Art

[0002] The core function of the underground water-sealed cavern is to store crude oil and other chemical products. The main principle is to build an artificial water curtain system above the oil storage cavern and inject water into the rock mass in the reservoir area to form a water curtain. Since water and oil are incompatible, it ensures that oil and gas will not leak and evaporate.

[0003] The oil storage cavern is excavated in the fractured rock mass and is located in the groundwater environment. The scale of the general underground water-sealed cavern engineering ranges from 3 million m³ to 10 million m³. Due to such large-scale underground rock excavation, a large amount of groundwater seeps into or flows into the oil storage cavern. When the amount of seepage reaches a certain scale, it will occupy the storage space of oil products and greatly increase the cost of pumping and drainage during the operation period. Based on the above considerations, in order to ensure the safety of oil storage and artificially inject water into the fractured rock mass, and at the same time ensure the necessary volume for oil storage and reduce operating costs, the amount of seepage in the oil storage cavern needs to be controlled.

[0004] The water curtain system is an important guarantee for the realization of the oil storage functionality of the underground water-sealed cavern. It is also the main source of increased water seepage in the oil storage cavern. When the water seepage reaches a certain scale, it will occupy the storage space of the oil and significantly increase the cost of pumping and drainage during operation.

[0005] At present, the conventional water curtain hole seepage detection is to measure and count its water injection volume to preliminarily determine whether it is a large flow abnormal water curtain hole, and then conduct a single hole water injection fallback experiment to obtain its average water permeability of the whole hole. The disadvantage of this method is that it can only determine the average permeability characteristics of the water curtain hole, and cannot accurately determine the specific location of the water-conducting structure distribution in the water curtain hole and its permeability characteristics and grouting characteristics, and further cannot accurately carry out targeted grouting treatment.

[0006] In view of this, it is necessary to propose a water curtain hole fracture rock seepage detection method, equipment and storage medium to solve or at least alleviate the above defects. Summary of the invention

[0007] The main purpose of the present invention is to provide a method, equipment and storage medium for detecting seepage in fractured rock mass through water curtain holes, so as to solve the technical problem that the seepage detection of water curtain holes in the prior art can only determine the average permeability characteristics of the water curtain holes, but cannot accurately determine the specific location of the distribution of the water-conducting structure in the water curtain holes and its permeability characteristics and grouting characteristics.

[0008] To achieve the above object, the present invention provides a method for detecting seepage in a water curtain hole fractured rock mass, comprising the following steps:

[0009] S1, obtaining real-life image information of the inner wall of the oil storage cavern, and judging whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition according to the real-life image information of the inner wall;

[0010] S2, when the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition, determine a potential associated water curtain hole above the water seepage area that has a water conduction association relationship with the water seepage area according to the cavern position where the water seepage area is located;

[0011] S3, determining whether the potential associated water curtain hole is a target abnormal water curtain hole;

[0012] S4, when the potential associated water curtain hole is a target abnormal water curtain hole, preliminarily determining a preliminary water guide structure between the water seepage area and the target abnormal water curtain hole according to the water seepage area and the target abnormal water curtain hole;

[0013] S5, obtaining geological structure development information of the target abnormal water curtain hole, and determining the abnormal interval in the hole according to the geological structure development information in the hole;

[0014] S6, determining a target water-conducting structure between the water-seepage area and the abnormal interval in the hole according to the abnormal interval in the hole and the water-seepage area, and using the target water-conducting structure as a target area for seepage control treatment.

[0015] Preferably, the step S3 specifically includes the following steps:

[0016] S31, counting the water injection volume variation curve of the potential associated water curtain hole within a preset period before and after the excavation of the oil storage cavern, and obtaining the daily water injection volume increment of the potential associated water curtain hole according to the water injection volume variation curve; wherein the water injection volume variation curve includes a mapping relationship between water injection volume and time;

[0017] S32, determining whether the daily water injection volume increment is greater than a first preset threshold; if so, executing step S33; if not, executing steps S34 to S37;

[0018] S33, determining that the potential associated water curtain hole is a target abnormal water curtain hole;

[0019] S34, injecting a tracer into the potential associated water curtain hole, and obtaining real-time status information of the inner wall of the oil storage cavern within a first preset time after injecting the tracer;

[0020] S35, judging whether the inner wall of the oil storage cavern meets the tracer exposure condition according to the real-time condition information of the inner wall; if so, executing step S36; if not, executing step S37;

[0021] S36, determining that the potential associated water curtain hole is a target abnormal water curtain hole;

[0022] S37, obtaining single-hole water injection fallback test data of the potential associated water curtain hole, and obtaining the permeability coefficient of the potential associated water curtain hole based on the single-hole water injection fallback test data, and when the difference between the permeability coefficient and a second preset threshold value is greater than an upper limit value of a preset range, determining that the potential associated water curtain hole is a target abnormal water curtain hole.

[0023] Preferably, the step S5 specifically includes the following steps:

[0024] S51, obtaining a continuous image of the borehole wall of the target abnormal water curtain hole obtained by a movable borehole television imaging device, and using the continuous image of the borehole wall as the geological structure development information in the hole; wherein the travel speed of the borehole television imaging device in the target abnormal water curtain hole is controlled within 3m / s, and the borehole television imaging device travels from the hole mouth position to the hole bottom position to obtain the continuous image of the borehole wall;

[0025] S52, determining an abnormal area satisfying an abnormal hole wall condition according to the continuous hole wall image;

[0026] S53, obtaining the position of each abnormal area in the target abnormal water curtain hole, and determining the abnormal interval in the hole according to all the abnormal areas.

[0027] Preferably, the step S52 specifically includes the following steps:

[0028] S521, obtaining a node image corresponding to each frame of the continuous hole wall image, and obtaining the mean value of the V channel in the HSV in the node image, and when the mean value is less than a third preset threshold, determining that there is an abnormal area in the node image that meets the abnormal hole wall condition;

[0029] S522, acquiring all node images with abnormal regions to determine all abnormal regions that meet the abnormal hole wall conditions.

[0030] Preferably, the step S5 further includes the following steps:

[0031] S61, obtaining the maximum water permeability of the abnormal interval in the hole;

[0032] S62, determining the grouting characteristics of the target water-conducting structure according to the maximum water permeability;

[0033] S63, grouting the target water-conducting structure according to the grouting characteristics;

[0034] S64, after the grouting is completed, wait for setting for 1 to 3 days, then re-drill the target abnormal water curtain hole in situ to restore the hole position, and then perform a post-grouting water pressure test to restore the normal water supply of the target abnormal water curtain hole.

[0035] Preferably, the step S62 specifically includes the following steps:

[0036] When the maximum water permeability q is less than 1Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class A water-conducting structure;

[0037] When 1Lu≤maximum water permeability q≤10Lu, the grouting characteristic of the target water-conducting structure is determined to be a Class B water-conducting structure;

[0038] When the maximum water permeability q>10Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class C water-conducting structure; wherein the water conductivity and grouting ability of Class A water-conducting structures, Class B water-conducting structures, and Class C water-conducting structures increase in sequence.

[0039] Preferably, the step S63 specifically includes the following steps:

[0040] According to the grouting characteristics, local grouting is performed in the abnormal interval inside the target abnormal water curtain hole; wherein, grouting is performed in a segmented grouting manner from inside to outside, the segment length is controlled between 5m and 10m, and the grouting pressure is controlled between 1.0 and 2.0MPa; when the target water-conducting structure is a Class A water-conducting structure, the slurry water-cement ratio is 5:1, 2:1, 1:1, and 0.5:1; when the target water-conducting structure is a Class B water-conducting structure, the slurry water-cement ratio is 2:1, 1:1, and 0.5:1; when the target water-conducting structure is a Class C water-conducting structure, the slurry water-cement ratio is 1:1 and 0.5:1.

[0041] Preferably, the tracer includes one or more of potassium permanganate and a fluorescent agent.

[0042] The present invention also provides a water curtain hole fracture rock mass seepage detection device, comprising:

[0043] A water seepage area acquisition unit, used to acquire real-scene image information of the inner wall of the oil storage cavern, and determine whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition according to the real-scene image information of the inner wall;

[0044] A potential associated water curtain hole acquisition unit is used to determine, when the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition, a potential associated water curtain hole above the water seepage area that has a water conduction association relationship with the water seepage area according to the cavern position where the water seepage area is located;

[0045] a preliminary water-conducting structure acquisition unit, configured to determine whether a potential associated water curtain hole is a target abnormal water curtain hole; when the potential associated water curtain hole is a target abnormal water curtain hole, preliminarily determining a preliminary water-conducting structure between the water seepage area and the target abnormal water curtain hole according to the water seepage area and the target abnormal water curtain hole;

[0046] An abnormal interval acquisition unit in the hole is used to acquire the geological structure development information in the hole of the target abnormal water curtain hole, and determine the abnormal interval in the hole according to the geological structure development information in the hole;

[0047] The target water-conducting structure acquisition unit is used to determine the target water-conducting structure between the water seepage area and the abnormal interval in the hole according to the abnormal interval in the hole and the water seepage area, and use the target water-conducting structure as the target area for seepage control processing.

[0048] The present invention also provides a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the water curtain hole fracture rock mass seepage detection method as described above are implemented.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention provides a water curtain hole fracture rock mass seepage detection method, equipment and storage medium. When the inner wall of the oil storage cavern has a seepage area that meets the seepage conditions, a potential associated water curtain hole above the seepage area that has a water conduction association relationship with the seepage area is determined. When the potential associated water curtain hole is a target abnormal water curtain hole, a preliminary water conduction structure between the seepage area and the target abnormal water curtain hole is preliminarily determined, the geological structure development information in the hole of the target abnormal water curtain hole is obtained, and the abnormal interval in the hole is determined according to the geological structure development information in the hole, and the target water conduction structure between the seepage area and the abnormal interval in the hole is determined, and the target water conduction structure is used as the target area for seepage control treatment. The present application uses geophysical and geological methods to find out the association between the water conduction structure and the oil storage cavern from the seepage source, and can accurately and quickly detect the specific location of the water curtain hole water conduction structure and its permeability characteristics and grouting characteristics, so that the water conduction fracture can be treated by local grouting through the water curtain hole in a targeted manner, which can significantly reduce the water seepage of the oil storage cavern, and finally achieve effective control of the water seepage of the oil storage cavern. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0052] Figure 1 is a schematic diagram of a flow chart in one embodiment of the present invention;

[0053] Figure 2 This is a flowchart of the specific steps included in step S3 in one embodiment of the present invention;

[0054] Figure 3 It is a schematic diagram of the planar relationship between the water curtain system and the oil storage cavern in the prior art;

[0055] Figure 4 It is a schematic diagram of the vertical relationship between the water curtain system and the oil storage cavern in the prior art;

[0056] Figure 5 A schematic diagram of the spatial relationship between the preliminary water-conducting structure and the oil storage cavern in one embodiment of the present invention;

[0057] Figure 6 Schematic diagram of the imaging expansion of the continuous image of the hole wall in one embodiment of the present invention;

[0058] Figure 7 Schematic diagram of grouting of a target water-conducting structure in one embodiment of the present invention.

[0059] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0060] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] In the present invention, the descriptions of "right part", "middle part", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "right part" and "middle part" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] Those skilled in the art should know that according to the relevant specifications for underground water-sealed caverns, the water seepage of a single project should be controlled within 0.02% of the storage scale, that is, the water seepage of the cavern corresponding to every 1 million cubic meters of oil storage scale should not exceed 200 cubic meters per day. Compared with underground projects in the highway, railway, hydropower and other industries, underground water-sealed caverns have stricter control standards for water seepage, which is also the biggest technical challenge and key work content faced by all underground water-sealed cavern construction projects.

[0064] The oil storage cavern is excavated in the fractured rock mass and is located in the groundwater environment. The scale of the general underground water-sealed cavern engineering ranges from 3 million m³ to 10 million m³. Due to such large-scale underground rock excavation, a large amount of groundwater seeps into or pours into the oil storage cavern. When the amount of seepage reaches a certain scale, it will occupy the storage space of oil products and greatly increase the cost of pumping and drainage during the operation period. Based on the above considerations, in order to ensure the safety of oil storage and artificially inject water into the fractured rock mass, and at the same time ensure the necessary volume for oil storage and reduce operating costs, it is necessary to control the seepage of the oil storage cavern, with the focus on the accurate detection of seepage in the fractured rock mass of the water curtain hole.

[0065] Generally, the oil storage caverns are a group of parallel caverns with a length of hundreds of meters, and the cross-sectional size is mostly above 500㎡. A water curtain tunnel is arranged 20m to 30m above the oil storage cavern, and a series of water curtain holes are arranged at 1.0m to 2.0m above the side wall of the water curtain tunnel at unequal intervals of 10m to 20m. The water curtain holes are mostly horizontal holes with a diameter of 110mm and a length of 50m to 100m. The plane relationship between the oil storage cavern and the water curtain system is as follows: Figure 3 As shown, the vertical relationship is Figure 4 shown.

[0066] Please see attached Figures 1 to 7 In one embodiment of the present invention, a method for detecting seepage in a water curtain hole fractured rock mass comprises the following steps:

[0067] S1, obtaining the real-life image information of the inner wall of the oil storage cavern, and judging whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage conditions according to the real-life image information of the inner wall; as a preferred example, the real-life image information of the inner wall of the oil storage cavern can be obtained by three-dimensional geological real-life imaging technology. Since the images of the water seepage area and the non-water seepage area are obviously different in color, it is possible to judge whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage conditions by the image color. In other embodiments, the texture of the real-life image information of the inner wall can also be analyzed by image processing technology to identify the water seepage area. For example, the water seepage area presents a rougher or fuzzy texture feature.

[0068] It is worth noting that the inner wall of the oil storage cavern may have a water seepage area that meets the water seepage conditions, or it may have multiple water seepage areas or no water seepage area. When there is no water seepage area, it means that the oil storage cavern has not been substantially affected. In this case, no detection is required. When there are multiple water seepage areas, the detection method for each water seepage area is the same. Therefore, in order to simplify the description, in this case, this application only describes the detection method of one water seepage area in detail.

[0069] S2, when the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition, determine a potential associated water curtain hole above the water seepage area that has a water conduction association relationship with the water seepage area according to the cavern position where the water seepage area is located;

[0070] When water seepage is found in the oil storage cavern, such as Figure 3 There is a section of the oil storage cavern 2 with a large amount of water seepage near the right end. Based on the spatial relationship between the oil storage cavern and the water curtain system, it can be preliminarily determined that the water curtain holes A2-4, A2-5, A2-6, and A2-7 are associated with the water-conducting structure of this section of the oil storage cavern. Of course, in most cases, the upper part of the section with a large amount of water seepage is covered with more water curtain holes. Figure 3 The analysis method of this technology is only explained for general cases. Therefore, water curtain holes A2-4, A2-5, A2-6, and A2-7 are regarded as potential associated water curtain holes that are associated with the water seepage area. The method of detecting whether each potential associated water curtain hole is the target abnormal water curtain hole is the same. Therefore, in order to simplify the explanation, in this case, only one of the potential associated water curtain holes is described in detail.

[0071] S3, determining whether the potential associated water curtain hole is a target abnormal water curtain hole;

[0072] S4, when the potential associated water curtain hole is a target abnormal water curtain hole, preliminarily determining a preliminary water guide structure between the water seepage area and the target abnormal water curtain hole according to the water seepage area and the target abnormal water curtain hole;

[0073] S5, obtaining geological structure development information of the target abnormal water curtain hole, and determining the abnormal interval in the hole according to the geological structure development information in the hole;

[0074] S6, determining a target water-conducting structure between the water-seepage area and the abnormal interval in the hole according to the abnormal interval in the hole and the water-seepage area, and using the target water-conducting structure as the target area for seepage control treatment. The area corresponding to the target water-conducting structure is the main reason why the oil storage cavern has a large amount of water seepage and is difficult to treat.

[0075] As a preferred implementation, step S3 specifically includes the following steps:

[0076] S31, counting the water injection volume variation curve of the potential associated water curtain hole within a preset period before and after the excavation of the oil storage cavern, and obtaining the daily water injection volume increment of the potential associated water curtain hole according to the water injection volume variation curve; wherein the water injection volume variation curve includes a mapping relationship between water injection volume and time;

[0077] S32, determining whether the daily water injection volume increment is greater than a first preset threshold; if so, executing step S33; if not, executing steps S34 to S37;

[0078] As a specific example, the water injection volume change curve (the relationship between water injection volume and time) of each potential associated water curtain hole within one week before and after the excavation of the oil storage cavern can be statistically analyzed. When the daily water injection volume increment exceeds 30%, the potential associated water curtain hole is determined to be the target abnormal water curtain hole, and the preliminary water guide structure between the water seepage area and the target abnormal water curtain hole is preliminarily determined based on the water seepage area and the target abnormal water curtain hole, that is, step S4 is entered. If the daily water injection volume increment does not exceed 30%, steps S34 to S37 are executed to further determine whether the potential associated water curtain hole is the target abnormal water curtain hole.

[0079] S33, determining that the potential associated water curtain hole is a target abnormal water curtain hole;

[0080] S34, injecting a tracer into the potential associated water curtain hole, and obtaining real-time status information of the inner wall of the oil storage cavern within a first preset time after injecting the tracer;

[0081] S35, judging whether the inner wall of the oil storage cavern meets the tracer exposure condition according to the real-time condition information of the inner wall; if so, executing step S36; if not, executing step S37;

[0082] As a specific example, a tracer can be injected into the potential associated water curtain hole. As a preferred example, the tracer includes one or more of potassium permanganate and fluorescent agent. And within the first preset time after the tracer is injected, the first preset time is preferably 1h, the tracer exposure on the inner wall of the oil storage cavern (i.e., the real-time status of the water seepage area) is obtained, and ultraviolet irradiation can be used for visualization and observation. When the tracer is injected into the potential associated water curtain hole within the first preset time, the inner wall of the oil storage cavern can be clearly found, and the potential associated water curtain hole is determined to be the target abnormal water curtain hole. If no tracer exposure is found on the inner wall of the oil storage cavern, step S37 needs to be taken to further determine whether the potential associated water curtain hole is the target abnormal water curtain hole.

[0083] S36, determining that the potential associated water curtain hole is a target abnormal water curtain hole;

[0084] S37, obtaining single-hole water injection fallback test data of the potential associated water curtain hole, and obtaining the permeability coefficient of the potential associated water curtain hole based on the single-hole water injection fallback test data, and when the difference between the permeability coefficient and a second preset threshold value is greater than an upper limit value of a preset range, determining that the potential associated water curtain hole is a target abnormal water curtain hole.

[0085] As a specific example, based on the single-hole water injection fallback test data (water pressure test) conducted on the potential associated water curtain hole, the permeability coefficient of the potential associated water curtain hole is obtained, and it is determined whether the difference between the permeability coefficient of the potential associated water curtain hole and the second preset threshold value (such as the conventional value) is greater than the upper limit of the preset range. For example, if the permeability coefficient of the potential associated water curtain hole is significantly larger than the conventional value, for example, when the permeability coefficient q>1Lu, the potential associated water curtain hole is determined to be a target abnormal water curtain hole. If there is no obvious abnormality in the permeability coefficient, it can be further determined in combination with the geological structure development information in the hole described later.

[0086] As a preferred implementation, step S5 specifically includes the following steps:

[0087] S51, obtaining a continuous image of the borehole wall of the target abnormal water curtain hole obtained by a movable borehole television imaging device, and using the continuous image of the borehole wall as the geological structure development information in the hole; wherein the travel speed of the borehole television imaging device in the target abnormal water curtain hole is controlled within 3m / s, and the borehole television imaging device travels from the hole mouth position to the hole bottom position to obtain the continuous image of the borehole wall;

[0088] S52, determining an abnormal area satisfying an abnormal hole wall condition according to the continuous hole wall image;

[0089] S53, obtaining the position of each abnormal area in the target abnormal water curtain hole, and determining the abnormal interval in the hole according to all the abnormal areas.

[0090] Specifically, the borehole TV imaging device can use existing mature technology equipment. After preliminarily determining that the target abnormal water curtain hole is associated with the water-conducting structure of the oil storage cavern, the movable borehole TV imaging device detection technology is used to obtain the hole wall continuous image of the target abnormal water curtain hole, and the hole wall continuous image is used as the geological structure development information in the hole to obtain the hole position of each abnormal area in the target abnormal water curtain hole, and determine the abnormal interval in the hole based on all abnormal areas, that is, the specific hole section interval of the target water-conducting structure in the current abnormal water curtain hole. To ensure the imaging quality and accuracy, the drilling speed should be controlled within 3m / s.

[0091] like Figure 6 As shown, Figure 6This is a schematic diagram of the imaging expansion of the continuous image of the borehole wall, where the range encircled by the black rectangular frame is the abnormal interval in the borehole, and obvious cracks are developed within this interval (the darker area in the figure is the crack area).

[0092] As a preferred implementation, step S52 specifically includes the following steps:

[0093] S521, obtaining a node image corresponding to each frame of the continuous hole wall image, and obtaining the mean value of the V channel in the HSV in the node image, and when the mean value is less than a third preset threshold, determining that there is an abnormal area in the node image that meets the abnormal hole wall condition;

[0094] S522, acquiring all node images with abnormal regions to determine all abnormal regions that meet the abnormal hole wall conditions.

[0095] Specifically, Figure 6 As shown, the mobile borehole television imaging device can obtain continuous video streams and high-definition expansion images of the inner wall of the water curtain hole. The continuous image of the borehole wall can clearly show the structural details on the borehole wall, by calculating the mean value of the V channel in the HSV in the node image (i.e., the brightness channel). Brightness represents the brightness or brightness of the color. When the V channel mean value of the node image is lower than the third preset threshold, the brightness of the node image is determined to be low. Considering the most unfavorable factors, the entire area corresponding to the node image is regarded as an abnormal area. By analyzing the abnormal area corresponding to all frames of the continuous image of the borehole wall, the abnormal interval in the hole can be determined.

[0096] Furthermore, considering the most unfavorable factors, the area corresponding to a node image with an abnormal area located at the innermost part of the water curtain hole can be used as the starting area, the area corresponding to a node image with an abnormal area located at the outermost part of the water curtain hole can be used as the ending area, and the water curtain hole section between the starting area and the ending area can be used as the abnormal interval in the hole. After knowing the abnormal interval in the hole, the development location of the target water-conducting structural fracture and its occurrence information can be known.

[0097] As another preferred embodiment, the step S5 further includes the following steps:

[0098] S61, obtaining the maximum water permeability of the abnormal interval in the hole;

[0099] S62, determining the grouting characteristics of the target water-conducting structure according to the maximum water permeability;

[0100] S63, grouting the target water-conducting structure according to the grouting characteristics;

[0101] S64, after the grouting is completed, wait for setting for 1 to 3 days, then re-drill the target abnormal water curtain hole in situ to restore the hole position, and then perform a post-grouting water pressure test to restore the normal water supply of the target abnormal water curtain hole.

[0102] In practice, it is found that when fractured rock mass develops in the water curtain hole, water injected into the rock mass through the water curtain hole will directly seep into the oil storage cavern. Under normal circumstances, when a large-scale water seepage event occurs in the oil storage cavern, the first step is to inject grout into the seepage area in the oil storage cavern to block the end of the seepage path. However, due to the extremely complex development of fractures in the rock mass and the continuous injection of a large amount of groundwater from the source of the water curtain hole, it will seep out from other parts of the oil storage cavern through these fractures, resulting in water seepage transfer. In view of this situation, conventional methods are difficult to effectively control the problem of cavern water seepage, resulting in the project being unable to meet the operation requirements.

[0103] Since the water curtain hole plays a vital role in ensuring the water sealing safety of stored oil products, it is not possible to take measures such as full-hole plugging or full-hole grouting of the water curtain hole. It is necessary to identify the development location of the water-conducting structure in the specific hole, take local treatment, and restore water supply after treatment.

[0104] It is worth noting that, in general, multiple water-conducting structures may develop in one water curtain hole. Therefore, the water curtain hole is divided into 5m or 10m long hole sections from the inside to the outside, and the water pressure test is carried out section by section using the single-point method to obtain the water permeability of the hole section where the water-conducting structure develops.

[0105] In order to obtain the permeability characteristics and grouting characteristics of the target water-conducting structure, a method of segmented water pressure is adopted in the target abnormal water curtain hole to measure the permeability characteristics of the hole section. The permeability characteristics and grouting characteristics of the target water-conducting structure can be distinguished according to the water permeability. Considering the most unfavorable factors, this embodiment adopts the maximum water permeability as the determination benchmark.

[0106] Furthermore, the step S62 specifically includes the following steps:

[0107] When the maximum water permeability q is less than 1Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class A water-conducting structure, and for the current abnormal water curtain hole, it is a hole section with average water conductivity and grouting properties;

[0108] When 1Lu≤maximum water permeability q≤10Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class B water-conducting structure; for the current abnormal water curtain hole, it is a hole section with greater water conductivity and grouting capability;

[0109] When the maximum water permeability q>10Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class C water-conducting structure; for the current abnormal water curtain hole, it is a hole section with extremely strong water conductivity and grouting properties; among them, the water conductivity and grouting properties of Class A water-conducting structures, Class B water-conducting structures, and Class C water-conducting structures increase in sequence.

[0110] Furthermore, the step S63 specifically includes the following steps:

[0111] In order to reduce the hydraulic connection between the target abnormal water curtain hole and the oil storage cavern, the target water-conducting structure is treated by local grouting in the target abnormal water curtain hole. Specifically, local grouting is performed in the abnormal interval in the hole of the target abnormal water curtain hole according to the grouting characteristics; wherein, grouting is performed in a segmented grouting manner from inside to outside, the segment length is controlled between 5m and 10m, and the grouting pressure is controlled between 1.0 and 2.0MPa; when the target water-conducting structure is a Class A water-conducting structure, the slurry water-cement ratio is 5:1, 2:1, 1:1, 0.5:1; when the target water-conducting structure is a Class B water-conducting structure, the slurry water-cement ratio is 2:1, 1:1, 0.5:1; when the target water-conducting structure is a Class C water-conducting structure, the slurry water-cement ratio is 1:1, 0.5:1.

[0112] For example, 5:1- means the mass ratio of water: cement is 5:1; 5:1, 2:1, 1:1, 0.5:1 means that for a grouting section, the concentration of cement slurry injected into the rock fissures changes step by step from 5:1 to 0.5:1. This process is the process of cement slurry from dilute to concentrated, which is more conducive to the diffusion of slurry and better filling of water-conducting fissures.

[0113] It should be noted that the above grouting parameters should be determined through production tests according to the geological conditions of the specific project. After the grouting is completed, it should be allowed to set for 1d to 3d, and then the water curtain hole should be re-drilled in situ to restore the hole position, and then a post-grouting water pressure test should be performed to restore its normal water supply. In principle, the treated water curtain hole can still maintain a certain amount of water injection (generally, the single hole water injection volume is preferably 1 to 5m³ / d) and has good connectivity with adjacent water curtain holes. It is generally recommended that the water curtain hole permeability after treatment is about 0.5Lu. If it is still unqualified after treatment, the water curtain hole can be treated twice with ultra-fine cement to reduce the permeability to meet the requirements.

[0114] In order to further illustrate the technical solution of this application, this application provides the following specific examples:

[0115] The technical solution of this application has been applied in the Heilongjiang XAL underground water-sealed cavern project, which is the largest underground water-sealed cavern project under construction in China. The rock mass in the reservoir area is mainly Permian monzogranite, interspersed with granite porphyry and diorite porphyry. The rock mass is relatively broken, with well-developed water-conducting structures. The average permeability coefficient of the rock mass is 2.04E-3m / d, and the permeability of the rock mass in some areas can reach 1~10Lu.

[0116] Seven water curtain tunnels are arranged 27m above the oil storage cavern, with a total of 719 water curtain holes. Among them, a large amount of water seepage occurred when the main cavern 2# was constructed to pile number 0+550~0+560. Conventional grouting treatment was used in the water seepage area in the oil storage cavern, but the water seepage amount still far exceeded the standard. The technical solution of this application detected that there was an obvious correlation between the water seepage area and the upper water curtain hole A3-008, which was used as the target abnormal water curtain hole. The water curtain hole is 94.0m long and 110mm in diameter. The solution of this application was further used to find out:

[0117] (1) There is a cavity in the target abnormal water curtain hole at a depth of 87.0-89.0 m. Water flows down along the cracks. The hole wall has poor integrity and blocks are falling off. The collapsed cavity span is 1 m.

[0118] (2) An open crack developed at a depth of 5.1m to 6.0m in the target abnormal water curtain hole, with an incidence of 162°, ∠14°, and a maximum crack width of about 5.0cm;

[0119] The water-conducting structures in the above two target abnormal water curtain holes conduct the oil storage caverns in the corresponding cavern sections below, which is the reason why the water seepage in the cavern cannot be effectively controlled. The target abnormal water curtain hole was subjected to segmented water pressure, and the water permeability of the above two hole sections was measured to be 10.0Lu and 1.09Lu, respectively, which is consistent with the situation revealed by the imaging in the hole. Therefore, the technical solution of this application was adopted to carry out grouting treatment on the above two hole sections of the target abnormal water curtain hole, and the hole was swept after 3 days. The water permeability of the corresponding hole sections after grouting was measured to be 0.94Lu and 0.18Lu, respectively, and the average water permeability of the whole hole was reduced from 3.5Lu before treatment to 0.4Lu. The water injection volume of the water curtain hole was reduced from the maximum of 67m³ / d before treatment to 2.0m³ / d, and the water seepage in the main cavern was greatly controlled, meeting the standard requirements.

[0120] Based on the treatment results of the above-mentioned water curtain hole A3-008, this technology was promoted and applied in water curtain holes of the same type, further reducing the water seepage of this project and achieving obvious technical effects.

[0121] This application has at least the following advantages:

[0122] (1) Technical benefits. This application uses geophysical and geological methods to identify the relationship between the water-conducting structure and the oil storage cavern from the source of water seepage, and treats the water-conducting fissures through water curtain holes in a targeted manner, which can significantly reduce the amount of water seepage in the oil storage cavern. This application is of great significance to promoting the development of industry technology.

[0123] (2) Economic benefits. According to statistics, domestic underground water-sealed cavern projects under construction and already built have invested heavily in water seepage control, which often accounts for 10% to 15% of the construction cost. The cost of a single project alone is as high as hundreds of millions of yuan. However, due to the complexity of underground projects, the uncertainty of geological conditions, the blindness of technical solutions, and the lax construction control, an unfavorable situation of huge investment and limited results has emerged. This application is a scientific, systematic, and economical engineering and technical means that has a beneficial effect on engineering cost control.

[0124] The present invention also provides a water curtain hole fracture rock mass seepage detection device, comprising:

[0125] A water seepage area acquisition unit, used to acquire real-scene image information of the inner wall of the oil storage cavern, and determine whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition according to the real-scene image information of the inner wall;

[0126] A potential associated water curtain hole acquisition unit is used to determine, when the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition, a potential associated water curtain hole above the water seepage area that has a water conduction association relationship with the water seepage area according to the cavern position where the water seepage area is located;

[0127] a preliminary water-conducting structure acquisition unit, configured to determine whether a potential associated water curtain hole is a target abnormal water curtain hole; when the potential associated water curtain hole is a target abnormal water curtain hole, preliminarily determining a preliminary water-conducting structure between the water seepage area and the target abnormal water curtain hole according to the water seepage area and the target abnormal water curtain hole;

[0128] An abnormal interval acquisition unit in the hole is used to acquire the geological structure development information in the hole of the target abnormal water curtain hole, and determine the abnormal interval in the hole according to the geological structure development information in the hole;

[0129] The target water-conducting structure acquisition unit is used to determine the target water-conducting structure between the water seepage area and the abnormal interval in the hole according to the abnormal interval in the hole and the water seepage area, and use the target water-conducting structure as the target area for seepage control processing.

[0130] The present invention also provides a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the water curtain hole fractured rock mass seepage detection method as described above are implemented. It can be understood that when the computer program is executed by the processor, the water curtain hole fractured rock mass seepage detection method as described above is implemented, so all embodiments of the above method are applicable to the storage medium, and can achieve the same or similar beneficial effects.

[0131] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A method for detecting seepage in a water curtain hole fractured rock mass, characterized in that: The following steps are involved: S1, obtaining real-life image information of the inner wall of the oil storage cavern, and judging whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition according to the real-life image information of the inner wall; S2, when the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition, determine a potential associated water curtain hole above the water seepage area that has a water conduction association relationship with the water seepage area according to the cavern position where the water seepage area is located; S3, determining whether the potential associated water curtain hole is a target abnormal water curtain hole; S4, when the potential associated water curtain hole is a target abnormal water curtain hole, preliminarily determining a preliminary water guide structure between the water seepage area and the target abnormal water curtain hole according to the water seepage area and the target abnormal water curtain hole; S5, obtaining geological structure development information of the target abnormal water curtain hole, and determining the abnormal interval in the hole according to the geological structure development information in the hole; S6, determining a target water-conducting structure between the water-seepage area and the abnormal interval in the hole according to the abnormal interval in the hole and the water-seepage area, and using the target water-conducting structure as a target area for seepage control treatment.

2. The water curtain hole fracture rock mass seepage detection method according to claim 1, characterized in that: The step S3 specifically comprises the following steps: S31, counting the water injection volume variation curve of the potential associated water curtain hole within a preset period before and after the excavation of the oil storage cavern, and obtaining the daily water injection volume increment of the potential associated water curtain hole according to the water injection volume variation curve; wherein the water injection volume variation curve includes a mapping relationship between water injection volume and time; S32, determining whether the daily water injection volume increment is greater than a first preset threshold; if so, executing step S33; if not, executing steps S34 to S37; S33, determining that the potential associated water curtain hole is a target abnormal water curtain hole; S34, injecting a tracer into the potential associated water curtain hole, and obtaining real-time status information of the inner wall of the oil storage cavern within a first preset time after injecting the tracer; S35, judging whether the inner wall of the oil storage cavern meets the tracer exposure condition according to the real-time condition information of the inner wall; if so, executing step S36; if not, executing step S37; S36, determining that the potential associated water curtain hole is a target abnormal water curtain hole; S37, obtaining single-hole water injection fallback test data of the potential associated water curtain hole, and obtaining the permeability coefficient of the potential associated water curtain hole based on the single-hole water injection fallback test data, and when the difference between the permeability coefficient and a second preset threshold value is greater than an upper limit value of a preset range, determining that the potential associated water curtain hole is a target abnormal water curtain hole.

3. The water curtain hole fracture rock mass seepage detection method according to claim 1, characterized in that: The step S5 specifically comprises the following steps: S51, obtaining a continuous image of the borehole wall of the target abnormal water curtain hole obtained by a movable borehole television imaging device, and using the continuous image of the borehole wall as the geological structure development information in the hole; wherein the travel speed of the borehole television imaging device in the target abnormal water curtain hole is controlled within 3m / s, and the borehole television imaging device travels from the hole mouth position to the hole bottom position to obtain the continuous image of the borehole wall; S52, determining an abnormal area satisfying an abnormal hole wall condition according to the continuous hole wall image; S53, obtaining the position of each abnormal area in the target abnormal water curtain hole, and determining the abnormal interval in the hole according to all the abnormal areas.

4. The water curtain hole fracture rock mass seepage detection method according to claim 3, characterized in that: The step S52 specifically includes the following steps: S521, obtaining a node image corresponding to each frame of the continuous hole wall image, and obtaining the mean value of the V channel in the HSV in the node image, and when the mean value is less than a third preset threshold, determining that there is an abnormal area in the node image that meets the abnormal hole wall condition; S522, acquiring all node images with abnormal regions to determine all abnormal regions that meet the abnormal hole wall conditions.

5. The water curtain hole fracture rock mass seepage detection method according to claim 3, characterized in that: The step S5 further includes the following steps: S61, obtaining the maximum water permeability of the abnormal interval in the hole; S62, determining the grouting characteristics of the target water-conducting structure according to the maximum water permeability; S63, grouting the target water-conducting structure according to the grouting characteristics; S64, after the grouting is completed, wait for setting for 1 to 3 days, then re-drill the target abnormal water curtain hole in situ to restore the hole position, and then perform a post-grouting water pressure test to restore the normal water supply of the target abnormal water curtain hole.

6. The method for detecting seepage in fractured rock mass through water curtain holes according to claim 5, characterized in that: The step S62 specifically includes the following steps: When the maximum water permeability q is less than 1Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class A water-conducting structure; When 1Lu≤maximum water permeability q≤10Lu, the grouting characteristic of the target water-conducting structure is determined to be a Class B water-conducting structure; When the maximum water permeability q>10Lu, the grouting characteristics of the target water-conducting structure are determined to be a Class C water-conducting structure; wherein the water conductivity and grouting ability of Class A water-conducting structures, Class B water-conducting structures, and Class C water-conducting structures increase in sequence.

7. The method for detecting seepage in fractured rock mass through water curtain holes according to claim 6, characterized in that: The step S63 specifically includes the following steps: According to the grouting characteristics, local grouting is performed in the abnormal interval inside the target abnormal water curtain hole; wherein, grouting is performed in a segmented grouting manner from inside to outside, the segment length is controlled between 5m and 10m, and the grouting pressure is controlled between 1.0 and 2.0MPa; when the target water-conducting structure is a Class A water-conducting structure, the slurry water-cement ratio is 5:1, 2:1, 1:1, and 0.5:1; when the target water-conducting structure is a Class B water-conducting structure, the slurry water-cement ratio is 2:1, 1:1, and 0.5:1; when the target water-conducting structure is a Class C water-conducting structure, the slurry water-cement ratio is 1:1 and 0.5:

1.

8. The water curtain hole fracture rock mass seepage detection method according to claim 2, characterized in that: The tracer includes one or more of potassium permanganate and a fluorescent agent.

9. A water curtain hole fracture rock mass seepage detection device, characterized in that: include: A water seepage area acquisition unit, used to acquire real-scene image information of the inner wall of the oil storage cavern, and determine whether the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition according to the real-scene image information of the inner wall; A potential associated water curtain hole acquisition unit is used to determine, when the inner wall of the oil storage cavern has a water seepage area that meets the water seepage condition, a potential associated water curtain hole above the water seepage area that has a water conduction association relationship with the water seepage area according to the cavern position where the water seepage area is located; a preliminary water-conducting structure acquisition unit, configured to determine whether a potential associated water curtain hole is a target abnormal water curtain hole; when the potential associated water curtain hole is a target abnormal water curtain hole, preliminarily determining a preliminary water-conducting structure between the water seepage area and the target abnormal water curtain hole according to the water seepage area and the target abnormal water curtain hole; An abnormal interval acquisition unit in the hole is used to acquire the geological structure development information in the hole of the target abnormal water curtain hole, and determine the abnormal interval in the hole according to the geological structure development information in the hole; The target water-conducting structure acquisition unit is used to determine the target water-conducting structure between the water seepage area and the abnormal interval in the hole according to the abnormal interval in the hole and the water seepage area, and use the target water-conducting structure as the target area for seepage control processing.

10. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the water curtain hole fracture rock mass seepage detection method as described in any one of claims 1 to 4 are implemented.

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