Layered controllable salt cavern forming device

Abstract

The utility model provides a layered controllable salt cavern cavity-making device. The layered controllable salt cavern cavity-making device comprises a layered water injection system, a multi-stage filtering module, a real-time monitoring assembly and an adjustable sleeve structure, the layered water injection system is composed of multiple stages of annular water injection pipes, and each layer of water injection pipe is provided with an independent control valve and a rotatable nozzle. The multi-stage filtering module comprises a spiral precipitation tank and a nano filter screen and is connected with the front end of the multi-stage annular water injection pipe; the real-time monitoring assembly comprises an ultrasonic sensor array and a pressure probe, and data are dynamically displayed through three-dimensional modeling software. Through the integrated design of layered water injection control, impurity filtration and dynamic monitoring, the problems of uncontrollable cavity form, pipeline blockage and monitoring blind areas in the prior art are solved, and the method is particularly suitable for high-precision cavity construction of the compressed air energy storage salt cavern.

Description

TECHNICAL FIELD

[0001] The utility model relates to salt cavern gas storage construction technical field especially, relates to a layered controllable salt cavern cavity making device. BACKGROUND

[0002] Salt cavern cavity making technology is a kind of engineering technology using underground salt layer or salt dome, and artificial cave is formed by dissolving salt rock.Because salt rock has the characteristics such as low permeability, high plasticity and self-healing, salt cavern cave has important application value in the field such as energy storage and waste storage.

[0003] At present, the existing salt cavern cavity making technology mostly adopts single water inlet or fixed casing structure, and the following problems exist: (1) cavity shape is uncontrollable: uneven salt layer dissolution leads to irregular cavity shape, which affects subsequent gas storage efficiency; (2) brine impurities blockage: unfiltered brine is easy to carry salt slag to block the pipeline, increasing maintenance cost; (3) lack of real-time monitoring: water injection parameters cannot be dynamically adjusted during cavity formation, which is difficult to adapt to complex geological conditions. UTILITY MODEL CONTENT

[0004] To solve the above problems, the utility model discloses a layered controllable salt cavern cavity making device, which is integrated by layered water injection control, impurity filtration and dynamic monitoring, solves the problems of uncontrollable cavity shape, pipeline blockage and monitoring blind area in the prior art, and is especially suitable for high-precision cavity making of compressed air energy storage salt cavern.

[0005] The specific scheme is as follows:

[0006] A layered controllable salt cavern cavity making device, comprising a layered water injection system, a multi-stage filtration module, a real-time monitoring assembly and an adjustable casing structure; the layered water injection system is composed of multi-stage annular water injection pipes, each layer of water injection pipe is provided with an independent control valve and a rotatable spray head; the multi-stage filtration module comprises a spiral sedimentation tank and a nanometer filter screen, and is connected with the front end of the multi-stage annular water injection pipe; the real-time monitoring assembly comprises an ultrasonic sensor array and a pressure probe, and data is dynamically displayed through three-dimensional modeling software.

[0007] Further, in the layered water injection system, the multi-stage annular water injection pipe is composed of 3-5 layers of water injection pipes (preferably 4 layers, and the length can be dynamically adjusted according to the thickness of the salt layer), and is a 316L stainless steel pipe (resistant to brine corrosion), the outer wall is provided with a corrosion-resistant coating (such as epoxy resin+carbon fiber composite layer), which prolongs the service life, and the layer spacing is set to 8±0.5 meters; each layer of water injection pipe is independently connected with an electromagnetic flow control valve (precision ±2%), and the valve body is resistant to pressure ≥15MPa; the rotatable spray head is driven by a turbine and installed at the end of the multi-stage annular water injection pipe, and the rotating speed can be adjusted in the range of 50-300rpm, and the spray angle is 30-90° (adjusted through the ground control console).

[0008] Further, the multi-stage annular water injection pipe comprises, from outside to inside, an outer water injection pipe, a middle water injection pipe and an inner water injection pipe, wherein the front end of the inner water injection pipe and the middle water injection pipe is sleeved with a sliding block, the end of the middle water injection pipe and the outer water injection pipe is embedded with a baffle, and the end of the inner water injection pipe is provided with a rotatable spray head and a nozzle.

[0009] Further, in the multi-stage filtering module, a spiral precipitation tank and a nano filter screen are arranged at the front end of the multi-stage annular water injection pipe to separate salt residue particles in the brine; and the filtered clean water is circulated to the water storage tank to reduce water resource consumption.

[0010] Further, in the real-time monitoring assembly, an ultrasonic sensor array and a pressure probe are installed in the cavity of the multi-stage annular water injection pipe to feed back the cavity shape and internal pressure in real time; and a ground control end dynamically displays the cavity shape through three-dimensional modeling software and automatically adjusts the water injection parameters.

[0011] The beneficial effects of the utility model lie in:

[0012] (1) Layered dissolution control: the multi-stage water injection pipe adjusts the dissolution rate of salt layers at different depths to form a uniform pear-shaped or bell-shaped cavity;

[0013] (2) Impurity filtration and circulation: reduce the risk of pipeline blockage and improve the cavity forming efficiency by more than 50%;

[0014] (3) Dynamic feedback system: the sensor and modeling technology are combined to realize accurate prediction and adjustment of the cavity shape. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model is a module schematic view.

[0016] Figure 2 The utility model is a structure schematic view.

[0017] LIST OF REFERENCE NUMERALS

[0018] 1-outer water injection pipe, 2-middle water injection pipe, 3-inner water injection pipe, 4-baffle, 5-sliding block, 6-rotatable spray head, 7-nozzle. DETAILED DESCRIPTION

[0019] The utility model will be further illustrated in combination with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model.

[0020] As shown in the figure, the application provides a layered controllable salt cave cavity forming device, which comprises a layered water injection system, a multi-stage filtering module, a real-time monitoring component and an adjustable sleeve structure; the layered water injection system is composed of multi-stage annular water injection pipes, each layer of water injection pipe is equipped with an independent control valve and a rotatable spray head; the multi-stage filtering module comprises a spiral sedimentation tank and a nano filter screen, which are connected with the front end of the multi-stage annular water injection pipe; the real-time monitoring component comprises an ultrasonic sensor array and a pressure probe, and data is dynamically displayed through three-dimensional modeling software.

[0021] In the layered water injection system, the multi-stage annular water injection pipe is composed of 3-5 layers of water injection pipes (preferably 4 layers, and the length can be dynamically adjusted according to the thickness of the salt layer), and is a 316L stainless steel pipe (resistant to halogen water corrosion), and an anticorrosion coating (such as an epoxy resin + carbon fiber composite layer) is arranged on the outer wall to prolong the service life, and the layer spacing is set to 8±0.5 meters; each layer of water injection pipe is independently connected with an electromagnetic flow control valve (precision ±2%), and the valve body is resistant to pressure ≥15MPa; the rotatable spray head is driven by a turbine and installed at the end of the multi-stage annular water injection pipe, and the rotating speed can be adjusted in the range of 50-300rpm, and the spray angle is 30-90° (adjusted through the ground control console).

[0022] Among them, the multi-stage annular water injection pipe comprises an outer layer water injection pipe 1, a middle layer water injection pipe 2 and an inner layer water injection pipe 3 arranged in sequence from outside to inside, wherein the front ends of the inner layer water injection pipe and the middle layer water injection pipe are sleeved with a sliding block 5, the ends of the middle layer water injection pipe and the outer layer water injection pipe are embedded with a baffle 4, and the end of the inner layer water injection pipe is provided with a rotatable spray head 6 and a nozzle 7.

[0023] In the multi-stage filtering module, a spiral sedimentation tank and a nano filter screen are arranged at the front end of the multi-stage annular water injection pipe to separate salt residue particles in the halogen water; the filtered clean water is circulated to the water storage tank to reduce water resource consumption.

[0024] In the real-time monitoring component, the ultrasonic sensor array and the pressure probe are installed in the cavity of the multi-stage annular water injection pipe to feed back the cavity shape and internal pressure in real time; the ground control end dynamically displays the cavity shape through three-dimensional modeling software and automatically adjusts the water injection parameters.

[0025] The implementation process of the application is as follows:

[0026] (1) Salt layer positioning and equipment installation: determine the salt layer position by using downhole television + resistivity logging, drill to the target depth (usually 500-2000 meters), install the segmented sleeve, and connect the layered water injection pipe and the filtering module.

[0027] (2) Layered water injection and dissolution: start the bottom layer water injection pipe, inject clean water to dissolve the salt layer, and gradually expand to the upper layer; adjust the water injection amount of each layer according to the sensor data (for example, the bottom layer water injection amount accounts for 60%, the middle layer accounts for 30%, and the upper layer accounts for 10%).

[0028] (3) Brine treatment and circulation: brine is separated from large salt sludge by spiral sedimentation tank, and then is returned to the water storage tank after being filtered by nano filter screen; the filter screen is cleaned regularly and the water quality is detected.

[0029] (4) Cavity shape monitoring: the ultrasonic sensor scans the cavity profile every 6 hours, and the data is transmitted to the control end in real time; if the cavity is detected to be skewed, the water injection valve of the corresponding area is automatically closed and the correction program is started.

[0030] (5) Later maintenance: after the cavity is formed, the sleeve is reserved as the injection and production channel of the subsequent gas storage; the anticorrosion coating and the sensor state are checked regularly.

[0031] The technical means disclosed by the utility model scheme is not limited to the technical means disclosed by the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be noted that, for ordinary skilled persons in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A layered controllable salt cavern cavity-creating device, characterized by: The application relates to a layered water injection system, a multi-stage filtering module, a real-time monitoring component and an adjustable sleeve structure.

2. The layered controllable salt cavern cavernizing device according to claim 1, characterized in that: The layered water injection system is composed of multi-stage annular water injection pipes, each layer of the water injection pipes is equipped with an independent control valve and a rotatable spray head; the multi-stage filtering module comprises a spiral sedimentation tank and a nanometer filter screen and is connected with the front end of the multi-stage annular water injection pipes; the real-time monitoring component comprises an ultrasonic sensor array and a pressure probe, and data is dynamically displayed through three-dimensional modeling software.

3. The layered controllable salt cavern cavernizing device according to claim 2, characterized in that: In the layered water injection system, the multi-stage annular water injection pipes are composed of 3-5 layers of water injection pipes and are made of 316L stainless steel pipes, the outer walls of which are provided with anticorrosive coatings, the layer spacing is set to be 8+ / -0.5 meters, each layer of the water injection pipes is independently connected with an electromagnetic flow control valve, the valve body is resistant to pressure greater than or equal to 15 MPa, the rotatable spray head is driven by a turbine and is installed at the end of the multi-stage annular water injection pipes, the rotating speed is adjustable in the range of 50-300 rpm, and the spray opening angle is 30-90 degrees.

4. The layered controllable salt cavern cavernizing device according to claim 1, characterized in that: The multi-stage annular water injection pipes comprise an outer water injection pipe, a middle water injection pipe and an inner water injection pipe which are sequentially arranged from outside to inside, the front ends of the inner water injection pipe and the middle water injection pipe are provided with sliding blocks, the ends of the middle water injection pipe and the outer water injection pipe are provided with baffle plates, and the end of the inner water injection pipe is provided with a rotatable spray head and a nozzle.

5. The layered controllable salt cavern cavernizing device according to claim 1, wherein: In the multi-stage filtering module, a spiral sedimentation tank and a nanometer filter screen are arranged at the front end of the multi-stage annular water injection pipes to separate salt residue particles in brine; the filtered clean water is circulated to a water storage tank to reduce water resource consumption. In the real-time monitoring component, the ultrasonic sensor array and the pressure probe are installed in the cavity of the multi-stage annular water injection pipes to feed back the cavity shape and the internal pressure in real time; the ground control end dynamically displays the cavity shape through three-dimensional modeling software and automatically adjusts the water injection parameters.

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