Method for controlling water seepage amount of main cavern of underground water-sealed oil storage cave depot

Abstract

The invention relates to the field of water seal oil storage caverns, in particular to an underground water seal oil storage cavern main cavern water seepage amount control method which comprises the steps of tunnel face and side wall grouting, bottom plate grouting, pump pit grouting and sporadic apron grouting. A Fahrenheit grouting pump and a single-liquid pump are combined for grouting and plugging fractures, stable grouting of grout is guaranteed through the low pulsation characteristic of the Fahrenheit grouting pump, disturbance to a rock mass structure is reduced, and the grout can permeate and diffuse along the tiny fractures instead of splitting rock mass; the grouting pressure of the single liquid pump is large, grouting of a deep hole can be achieved, uniform and stable grout is conveyed by the single liquid pump, and continuity and safety of grouting operation are guaranteed. A Fahrenheit grouting pump and a single-liquid pump are combined for grouting and plugging cracks, effective plugging of the cracks of the main cavern of the underground water-sealed oil storage cave depot can be achieved, and the water seepage amount of the main cavern of the underground water-sealed oil storage cave depot can be effectively controlled. The mung beans are added in the grouting process of the Fahrenheit grouting pump, so that the purpose of rapidly solidifying the grout is achieved, and the grouting quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of water-sealed oil storage caverns, and particularly to a method for controlling the seepage of the main chamber of an underground water-sealed oil storage cavern. Background Technology

[0002] In underground water-sealed oil storage cavern projects, the main cavern needs to rely on stable groundwater pressure to create a water seal over the oil storage space to prevent oil leakage. However, excessive permeability of the surrounding rock can lead to increased water inflow within the cavern, causing the external water pressure to consistently exceed the gas pressure inside, resulting in continuous seepage. This not only increases construction and operating costs but also affects the safety and economic viability of the cavern. Currently, grouting is commonly used to fill fissures and water-conducting structures in the surrounding rock to form a water-blocking curtain and control seepage. This involves injecting grout into the rock pores under pressure to improve its permeability and mechanical properties, forming a solid rock mass with strong integrity and good impermeability. However, in sections with poor surrounding rock conditions and insufficient grout injectability and stability, a single grouting method is prone to problems such as grout leakage, material waste, and substandard grouting quality, seriously affecting construction quality, progress, and cost control. Furthermore, there is a lack of mature experience in controlling seepage in the main cavern of such caverns in China. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a method for controlling the seepage of the main chamber of an underground water-sealed oil storage cavern.

[0004] A method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern includes the following steps: A: Grouting of the working face and sidewalls A1: Erect full-span scaffolding, lay out drill holes with a spacing of 1m×1m and a depth of 6m-8m; A2: Use a Fahrenheit grouting pump to inject grout to seal the cracks. Additives, including mung beans, are added during the grouting process. A3: Use a hand drill to drill holes at the unblocked water outlets. After drilling, use a Fahrenheit grouting pump to inject grout again. Additives, including mung beans, are added during the grouting process. A4: After the full scaffolding is dismantled, the leak points in the middle or top layer are drilled with a high-altitude drill, and grouting is performed with a single-liquid pump after the drilling is completed. B: Grouting of the base plate B1: Drill holes are laid out, with a spacing of 4m-6m between the grouting holes in the bottom plate, including a first grouting hole with a depth of 2m-4m and a second grouting hole with a depth of 8m-10m; B2: Use a Fahrenheit grouting pump to grout and seal the cracks in the first grouting hole, and use a single-liquid pump to grout and seal the cracks in the second grouting hole; C: Grouting of the pump pit C1: Drill holes in the bottom plate at a distance of 2m from the outer perimeter of the pump pit, with a hole depth of 15m-20m and a hole spacing of 2m-3m; C2: First, use a single-liquid pump to inject deep holes, then use a Fahrenheit grouting pump to seal the holes; D: Sporadic grouting D1: Remove the concrete to locate the water outlet; D2: After drilling holes with an aerial drill, grout is injected into the grouting holes.

[0005] Preferably, the grouting pump adopts pure pressure grouting, with grout prepared at the grouting point and supplied to the grouting pump.

[0006] Preferably, the high-precision proportional adjustment function of the Huashi grouting pump is used to start grouting according to the designed low starting pressure and flow rate; after sufficient penetration and filling under low pressure, the pressure is increased in stages to expand the grout diffusion radius; grouting ends when the designed injection volume is reached, the pressure is stable at the upper limit of the design and the grout absorption rate is less than the set threshold, or grout returns from adjacent holes.

[0007] Preferably, a backward segmented grouting method is adopted.

[0008] Preferably, skip-hole and sequential grouting is performed according to the designed sequence.

[0009] Preferably, grouting is performed by drilling 8m-10m deep grouting holes in the bottom plate of the working face, with a hole spacing of 2m-3m; grouting is also performed by drilling 10m-14m deep holes 2m-3m away from the bottom plate of the working face, with a hole spacing of 2m-3m.

[0010] Preferably, the bottom plate of the working face is first drilled with holes spaced apart, and then grouting is performed before densification.

[0011] Preferably, the proportion of mung beans by weight is 3%-5%.

[0012] Preferably, the additive also includes calcium chloride.

[0013] Preferably, the mass percentage of calcium chloride is 2%-4%.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern. It utilizes a combination of a Fahrenheit grouting pump and a single-liquid pump to grout and seal fissures. The Fahrenheit grouting pump features high-precision proportional adjustment, low pulsation, wide-range flow and pressure control (especially adept at low flow and high pressure or low pressure control), and stable delivery. Its grouting pressure is easier to control and relatively stable overall, making it particularly suitable for shallow-hole grouting. The low pulsation characteristic of the Fahrenheit grouting pump ensures smooth grout injection, reducing disturbance to the rock mass structure and facilitating grout penetration and diffusion along micro-fissures rather than splitting the rock mass. The single-liquid pump, with its high grouting pressure, enables grouting into deep holes. Furthermore, the single-liquid pump delivers a uniform and stable grout, eliminating the risk of instantaneous solidification within the equipment and ensuring the continuity and safety of the grouting operation.

[0015] This invention utilizes a combination of a Fahrenheit grouting pump and a single-liquid pump to grout and seal fissures. The Fahrenheit grouting method provides low-flow, high-precision control and pressure stability, meeting the stringent low-pressure, fine-grained grouting requirements of underground water-sealed caverns. This avoids rock mass damage or ineffective grout diffusion caused by pressure runaway. The Fahrenheit grouting method ensures stable grout delivery, minimizing disturbance to the surrounding rock and protecting the water-sealing system. It ensures that the grout fills fissures primarily through infiltration rather than fracturing, resulting in a more reliable sealing effect. This method effectively seals fissures in the main chamber of underground water-sealed oil storage caverns, thereby effectively controlling the seepage of the main chamber.

[0016] In addition, this invention adds mung beans during the grouting process of the Huashi grouting pump. The diameter of mung beans is larger than that of fibers, and the mung beans will swell, which is effective in sealing large gaps. Moreover, the round appearance makes it less likely to clog the grouting pipe. This achieves the purpose of rapid solidification of the grout and ensures the quality of grouting. It can greatly accelerate the sealing speed of cracks in the main cavern of underground water-sealed oil storage caverns, improve the sealing effect, and further effectively control the seepage of water in the main cavern of underground water-sealed oil storage caverns. Attached Figure Description

[0017] Figure 1 A schematic diagram of drilling holes in the floor slab of the main chamber of an underground water-sealed oil storage cavern.

[0018] Figure 2 for Figure 1 AA section diagram.

[0019] Figure 3 This is a schematic diagram of the sidewall of the main chamber of an underground water-sealed oil storage cavern before grouting.

[0020] Figure 4 This is a schematic diagram of the sidewall of the main chamber of an underground water-sealed oil storage cavern after grouting. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0022] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0024] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0025] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0026] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0027] Example 1 A method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern includes the following steps: A: Grouting of the working face and sidewalls A1: Erect full-span scaffolding and use the YT-28 hand-held pneumatic drill system to drill holes with a spacing of 1m×1m and a depth of 6m-8m.

[0028] A2: After drilling, the fissures are sealed using a Fahrenheit grouting pump. The Fahrenheit grouting pump offers relatively stable grouting pressure, making it particularly suitable for shallow-hole grouting. Its low-pulsation characteristics ensure smooth grout injection, reducing disturbance to the rock mass and facilitating grout penetration and diffusion along micro-fissures rather than splitting the rock. Admixtures, including mung beans, are added during the grouting process. Mung beans, with a diameter larger than fiber but smaller than soybeans, swell, effectively sealing large fissures. Their round shape also prevents clogging of the grouting pipe, achieving rapid grout solidification while maintaining grouting quality. This significantly accelerates the sealing of fissures in the main chamber of underground water-sealed oil storage tunnels, improving the sealing effect.

[0029] A3: Drill holes at unblocked water outlets using a hand-held pneumatic drill (drilling holes according to the water outlet points). After drilling, grout is injected again using a Fahrenheit grouting pump. The Fahrenheit grouting pump has a relatively stable grouting pressure, making it particularly suitable for shallow hole grouting. The low-pulsation characteristic of the Fahrenheit grouting pump ensures smooth grout injection, reducing disturbance to the rock mass structure and facilitating grout penetration and diffusion along micro-cracks rather than splitting the rock mass. Admixtures are added during the grouting process, including mung beans. The diameter of mung beans is larger than that of fibers, causing them to swell and effectively seal large cracks. Moreover, their round shape makes them less likely to clog the grouting pipe, achieving both rapid grout solidification and ensuring grouting quality. This significantly accelerates the sealing speed of cracks in the main chamber of underground water-sealed oil storage caverns and improves the sealing effect.

[0030] A4: After the full scaffolding is dismantled, high-altitude drilling is used to drill holes at the leakage points in the middle or top layer. After drilling, grouting is performed using a single-liquid pump. The grouting pressure of the pump is high, which can achieve grouting of deep holes. Moreover, the single-liquid pump delivers uniform and stable grout, eliminating the risk of instantaneous solidification inside the equipment, thus ensuring the continuity and safety of the grouting operation.

[0031] In the preferred scheme, the mass ratio of mung beans is 3%-5%. Adding mung beans within this mass ratio range can achieve the purpose of rapid solidification of the grout while ensuring the quality of grouting. This can greatly accelerate the sealing speed of cracks in the main chamber of underground water-sealed oil storage caverns and improve the sealing effect.

[0032] like Figures 3-4 As shown, after grouting the sidewalls of the main cavern using the grouting method described in this invention, the large cracks and water seepage in the sidewalls were effectively controlled.

[0033] B: Grouting of the base plate B1: As Figures 1-2 As shown, boreholes are laid out with a spacing of 4m-6m between the grouting holes in the bottom plate, including a first grouting hole with a depth of 2m-4m and a second grouting hole with a depth of 8m-10m; B2: A Fahrenheit grouting pump is used to grout and seal the fissures in the first grouting hole, and a single-liquid pump is used to grout and seal the fissures in the second grouting hole. The Fahrenheit grouting pump has a relatively stable overall grouting pressure, making it particularly suitable for shallow hole grouting. The low-pulsation characteristic of the Fahrenheit grouting pump ensures smooth grout injection, reduces disturbance to the rock mass structure, and facilitates grout penetration and diffusion along micro-fissures rather than splitting the rock mass. The single-liquid pump has a high grouting pressure, enabling grouting in deep holes. Furthermore, the single-liquid pump delivers a uniform and stable grout, eliminating the risk of instantaneous solidification within the equipment and ensuring the continuity and safety of the grouting operation. Using a combination of the Fahrenheit grouting pump and the single-liquid pump to grout and seal fissures can effectively seal the fissures in the main chamber of an underground water-sealed oil storage cavern, thereby effectively controlling the seepage of the main chamber.

[0034] In a preferred embodiment, grouting is performed on the face floor by drilling 8m-10m deep grouting holes with a hole spacing of 2m-3m; grouting is also performed by drilling 10m-14m deep holes 2m-3m away from the face floor, with a hole spacing of 2m-3m. In a further embodiment, the face floor is first drilled with holes spaced apart, then grouted, and then the holes are densified to ensure construction safety and effectively seal the cracks in the tunnel.

[0035] C: Grouting of the pump pit C1: Drill holes in the bottom plate at a distance of 2m from the outer perimeter of the pump pit, with a hole depth of 15m-20m and a hole spacing of 2m-3m; C2: First, use a single-liquid pump to inject deep holes, then use a Fahrenheit grouting pump to seal the holes.

[0036] Using a combination of Fahrenheit grouting pumps and single-liquid pumps to grout and seal cracks can effectively seal the cracks in the main chamber of underground water-sealed oil storage caverns, thereby effectively controlling the seepage of the main chamber.

[0037] D: Sporadic grouting D1: Remove the concrete to locate the water outlet; D2: After drilling holes with an aerial drill, grout is injected into the grouting holes.

[0038] In the preferred embodiment, the grouting pump adopts pure pressure grouting, with grout prepared at the grouting point and supplied to the grouting pump. Several grouting pumps can be supplied at one grouting point at the same time. The pipe embedding method adopts pure pressure plug or pre-embedded galvanized pipe. The opening ratio can be freely adjusted by adding condensate according to the site conditions.

[0039] In the preferred scheme, boreholes are drilled according to the designed location, angle, and depth; borehole opening pipes and grout stop plugs (for segmented grouting) are installed; the boreholes are cleaned, and a water pressure test is conducted to obtain the initial permeability; grouting begins strictly according to the designed low initial pressure and flow rate using the high-precision proportional adjustment function of the Fahrenheit grouting pump; based on the preset control logic, the Fahrenheit grouting pump automatically, smoothly, and without pulsation adjusts the output pressure and flow rate. The low-pulsation characteristic of the Fahrenheit grouting pump ensures stable grout injection, reduces disturbance to the rock mass structure, and facilitates grout penetration and diffusion along micro-fractures rather than splitting the rock mass; after sufficient penetration and filling under low pressure, stable and controllable graded pressurization can be carried out under system control to expand the grout diffusion radius or treat slightly larger fractures; grouting for that segment ends when the designed injection volume is reached, the pressure stabilizes at the design upper limit and the grout absorption rate is less than the set threshold, or grout returns from adjacent boreholes; a backward segmented grouting method is adopted, or skip-hole and sequential grouting is performed according to the designed sequence to ensure effective grout filling without interference.

[0040] In the preferred embodiment, the admixture also includes calcium chloride. The mass percentage of calcium chloride is 2%-4%. Calcium chloride can improve the corrosion resistance of the surrounding rock and largely prevent water seepage.

[0041] When grouting leaks, the Huashi grouting pump method allows for on-site immediate mixing of cement grout grades, compared to single-liquid grouting, to seal the leaks with progressively thicker grout. For larger leaks, various admixtures can be added, which can significantly accelerate the solidification and sealing of the grout at the leak point, while also strengthening the stability of the rock structure. The use of various admixtures, either individually or in combination, also improves the corrosion resistance of the surrounding rock, greatly preventing further water seepage.

[0042] The precise pressure and flow control of the Huashi grouting pump, combined with optimized grout ratio, enables it to effectively seal micron-level cracks that are difficult to handle using traditional methods. The Huashi grouting pump method fundamentally improves the sealing of surrounding rock and the control of groundwater seepage, reduces leakage risks, and ensures the long-term safe and stable operation of the cavern and environmental protection.

[0043] The grouting pump described in this invention can be the HS-B5 tunnel grouting machine.

[0044] The preferred scheme also includes deep-hole grouting of the bottom plate: nine 3-meter holes are drilled in the bottom plate of the oil storage cavern K0+496, and borehole pipes are installed. Grouting is performed first to seal the holes, followed by grouting through the holes. The grouting is done in sections, with each section no deeper than 15 meters, and the final section is 40 meters long. Significant leakage occurred during grouting, and the holes were cleaned and re-grouted after setting. This scheme allows for rapid deep-hole grouting of the bottom plate with good grouting results.

[0045] The preferred solution also includes addressing water seepage at the base of the side walls by drilling 6m-8m holes at 1m-2m in the base plate for grouting, with a spacing of 2m-3m. 6m-8m inclined holes are drilled at the base of the side walls, arranged in a staggered pattern with the holes at a height of 1m-2m. This effectively seals the cracks at the base of the side walls, reducing water seepage.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern, characterized in that, Includes the following steps: A: Grouting of the working face and sidewalls A1: Erect full-span scaffolding, lay out drill holes with a spacing of 1m×1m and a depth of 6m-8m; A2: Use a Fahrenheit grouting pump to inject grout to seal the cracks. Additives, including mung beans, are added during the grouting process. A3: Use a hand drill to drill holes at the unblocked water outlets. After drilling, use a Fahrenheit grouting pump to inject grout again. Additives, including mung beans, are added during the grouting process. A4: After the full scaffolding is dismantled, the leaking points in the middle or top layer are drilled with a high-altitude drill, and grouting is performed with a single-liquid pump after the drilling is completed. B: Grouting of the base plate B1: Drill holes are laid out, with a spacing of 4m-6m between the grouting holes in the bottom plate, including a first grouting hole with a depth of 2m-4m and a second grouting hole with a depth of 8m-10m; B2: Use a Fahrenheit grouting pump to grout and seal the cracks in the first grouting hole, and use a single-liquid pump to grout and seal the cracks in the second grouting hole; C: Grouting of the pump pit C1: Drill holes in the bottom plate at a distance of 2m from the outer perimeter of the pump pit, with a hole depth of 15m-20m and a hole spacing of 2m-3m; C2: First, use a single-liquid pump to inject deep holes, then use a Fahrenheit grouting pump to seal the holes; D: Sporadic grouting D1: Remove the concrete to locate the water outlet; D2: After drilling holes with an aerial drill, grout is injected into the grouting holes.

2. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 1, characterized in that, The Huashi grouting pump uses pure pressure grouting, with grout prepared at the grouting point and supplied to the grouting pump.

3. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 1, characterized in that, Using the high-precision proportional adjustment function of the Huashi grouting pump, grouting begins according to the designed low starting pressure and flow rate; after sufficient penetration and filling under low pressure, staged pressurization is carried out to expand the grout diffusion radius; grouting ends when the designed injection volume is reached, the pressure is stable at the upper limit of the design and the grout absorption rate is less than the set threshold, or grout returns from adjacent holes.

4. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 3, characterized in that, Retreating segmented grouting is adopted.

5. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 3, characterized in that, Perform skip-hole and sequential grouting according to the designed sequence.

6. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 1, characterized in that, Grouting is performed on the bottom plate of the working face by drilling 8m-10m deep grouting holes with a hole spacing of 2m-3m; grouting is also performed on the bottom plate of the working face by drilling 10m-14m deep holes 2m-3m away from the bottom plate of the working face with a hole spacing of 2m-3m.

7. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 6, characterized in that, The bottom plate of the working face is first drilled with holes spaced apart, and then grouting is performed before densification.

8. The method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 1, characterized in that, The weight percentage of mung beans is 3%-5%.

9. A method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to any one of claims 1-8, characterized in that, Additives also include calcium chloride.

10. A method for controlling seepage in the main chamber of an underground water-sealed oil storage cavern according to claim 9, characterized in that, The mass percentage of calcium chloride is 2%-4%.

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