CN110984965A - Air bag type layered water pumping test system and method for drilling holes in same diameter - Google Patents
Air bag type layered water pumping test system and method for drilling holes in same diameter Download PDFInfo
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- CN110984965A CN110984965A CN201911136478.6A CN201911136478A CN110984965A CN 110984965 A CN110984965 A CN 110984965A CN 201911136478 A CN201911136478 A CN 201911136478A CN 110984965 A CN110984965 A CN 110984965A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
Abstract
The invention relates to an air bag type layered water pumping test system for drilling holes in the same diameter, which comprises an upper water stopping air bag component, a water pumping component and a lower water stopping air bag component which are sequentially arranged; the upper water stopping air bag component is provided with a hollow connecting pipe, two ends of the hollow connecting pipe penetrate through the upper water stopping air bag component, and the lower end of the hollow connecting pipe is communicated with the water pumping component; the lower water stop air bag component is provided with a connecting pipe with the lower end sealed, and the upper end of the connecting pipe extends out of the lower water stop air bag component and is connected with the water pumping component; the upper water stopping air bag component and the lower water stopping air bag component are communicated with each other, the upper water stopping air bag component is provided with a first hollow pipe and a second hollow pipe, the upper end of the first hollow pipe is communicated with a pressure measuring pipe, and the upper end of the second hollow pipe is communicated with a water return pipe. Meanwhile, the invention also discloses an air bag type layered water pumping test method for the same-diameter drilled holes. The invention has simple structure, convenient use, effective reduction of equipment cost and test cost and strong operability.
Description
Technical Field
The invention relates to a water pumping test system, belongs to the technical field of geotechnical engineering investigation, and particularly relates to an air bag type layered water pumping test system for drilling holes in the same diameter; meanwhile, the invention also discloses an air bag type layered water pumping test method for the same-diameter drilled holes based on the air bag type layered water pumping test system for the same-diameter drilled holes.
Background
The drilling layered water pumping and water injection test is a necessary project for hydrogeological exploration, resource geological exploration, production supplement exploration, water source geological exploration and engineering geological exploration, and the water pumping test of a plurality of aquifers in the same drilling hole is the most common test project in the exploration projects.
The traditional same drilling layered water pumping test method mainly comprises the following two steps: 1. the method needs multiple reducing and needs larger aperture opening when multiple layered water pumping tests are related, the cost is higher, time and labor are wasted, drilling is stopped when drilling to a test position, the operability of controlling the thickness of the aquifer is poor, and in addition, the method is not very reliable after test verification of the water stopping effect. 2. A small-grade sleeve is prepared in a large-caliber drill hole, and a test is carried out after water stopping materials such as kelp, clay and the like are wound on a pin.
The two methods are time-consuming and labor-consuming, the comprehensive drilling cost is high, the limitation is large in the using process of equipment, the layered water pumping test cannot be continuously carried out, particularly, the water stopping performance is extremely unreliable, and errors often occur in the test.
Disclosure of Invention
Based on the technical problems, the invention provides the air bag type layered water pumping test system for the same-diameter drilling, so that the technical problems of high cost, time and labor waste in the operation process, incapability of continuous layered test, and poor operability and water stopping effect of the prior art are solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an air bag type layered water pumping test system for drilling holes in the same diameter comprises an upper water stopping air bag component, a water pumping component and a lower water stopping air bag component which are sequentially arranged; the upper water stopping air bag component is provided with a hollow connecting pipe, two ends of the hollow connecting pipe penetrate through the upper water stopping air bag component, and the lower end of the hollow connecting pipe is communicated with the water pumping component; the lower water stop air bag component is provided with a connecting pipe with a sealed lower end, and the upper end of the connecting pipe extends out of the lower water stop air bag component and is connected with the water pumping component; the upper water stopping air bag component and the lower water stopping air bag component are communicated with each other, the upper water stopping air bag component is further provided with a first hollow pipe and a second hollow pipe which penetrate through the upper water stopping air bag component, the upper end of the first hollow pipe is communicated with a pressure measuring pipe, and the upper end of the second hollow pipe is communicated with a water return pipe.
As a first optimization scheme of the invention, the upper water stopping air bag component and the lower water stopping air bag component are respectively composed of two air bag steel rings and an air bag hermetically connected between the two air bag steel rings, and the air bags of the upper water stopping air bag component and the lower water stopping air bag component are mutually communicated through an air pipe.
As a further optimization scheme of the second optimization scheme, the airbag type layered water pumping test system for the same-diameter drilling hole further comprises a high-pressure nitrogen gas supply device, the high-pressure nitrogen gas supply device is communicated with the airbag of the upper water stop airbag assembly through an inflation tube, and a nitrogen control valve is further arranged on the inflation tube.
As a second optimization scheme of the invention, the lower end of the connecting pipe extends out of the lower water stop airbag assembly.
As a third optimization scheme of the invention, a drill rod is also communicated between the connecting pipe and the water pumping assembly and/or the upper end of the hollow connecting pipe.
As a fourth optimization scheme of the invention, the water pumping assembly comprises a water passing cover and a variable frequency water pump arranged in the water passing cover, pipe connectors connected with the hollow connecting pipe and the connecting pipe are arranged at the upper end and the lower end of the water passing cover, and the water outlet end of the variable frequency water pump is in sealed communication with the pipe connector at the upper end of the water passing cover.
As a further optimization scheme of a fourth optimization scheme, the air bag type layered water pumping test system for drilling holes in the same diameter further comprises a ground frequency conversion control system, wherein the ground frequency conversion control system comprises a power supply device, a voltage stabilizer and a water pump frequency conversion control cabinet which are electrically connected in sequence, and the water pump frequency conversion control cabinet is electrically connected with the frequency conversion water pump through a circuit line. Preferably, the upper water stop airbag assembly is further provided with a third hollow pipe, and a circuit line of the variable frequency water pump is wired inside the third hollow pipe and electrically connected with the variable frequency controller.
As a fifth optimization scheme of the invention, the airbag type stratified water pumping test system with the same-diameter drilled holes further comprises a water outlet pipeline system, the water outlet pipeline system comprises a water outlet pipe communicated with the upper end of the hollow connecting pipe, a water outlet control valve and a water meter are arranged on the water outlet pipe, the water return pipe is communicated with the water outlet pipe, and a water return control valve is arranged at the communication position of the water return pipe and the water outlet pipe.
As a sixth optimization scheme of the invention, the hollow connecting pipe is a stainless steel pipe.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple structure and convenient use, and effectively reduces the equipment cost and the test cost. The drilling does not need reducing or reaming, any layer with different depths can be selected to carry out continuous water pumping test according to needs after one-time pore forming, the operation flow is greatly simplified, the construction period is shortened, the saving effect is obvious, the operability is strong, and the time and the labor are saved.
2. According to the invention, through the structural design of the upper water stopping air bag assembly and the lower water stopping air bag assembly, the water stopping structure is simplified, the water stopping effect is obviously superior to that of the prior art, the water stopping effect can be performed on test layers with different depths, and the water stopping effect is good.
3. The device can pertinently change the relative positions of the upper water stopping air bag assembly and the lower water stopping air bag assembly after determining the top bottom plate of the test layer, has more accurate control on the accuracy of the top bottom plate of the test layer compared with the prior art, and can effectively avoid mixed water pumping caused by crossing the stratum with larger difference of permeability coefficients.
4. The upper water stopping air bag component and the lower water stopping air bag component adopt air bags as main water stopping structures, have short inflation and deflation time and reliable and instant water stopping, and effectively solve the problem that the water stopping material needs to be expanded for a certain time.
5. The invention can also be used as a water sampler for continuously sampling water samples in sections after one-time pore forming, realizes the sampling of water samples at different layers, and has simple and convenient operation.
Meanwhile, the invention also provides an air bag type layered water pumping test method for the same-diameter drilled holes based on the air bag type layered water pumping test system for the same-diameter drilled holes, and the method comprises the following steps:
1) drilling to form a hole, wherein the hole diameter of the drilled hole is not less than 130mm, and is 10-20mm larger than the initial diameter of the air bag of the upper water stop air bag assembly or the lower water stop air bag assembly, the hole wall is ensured to be smooth and straight in the drilling process, and the hole is washed after the drilling is finished;
2) checking the air bag tightness of the upper water stopping air bag assembly and the lower water stopping air bag assembly, and sealing the joints between the first hollow pipe, the second hollow pipe, the third hollow pipe, the hollow connecting pipe and the air bags of the upper water stopping air bag assembly;
3) determining the position of a test layer in a drill hole, connecting a drill rod between the water pumping component and the lower water-stopping air bag component and the upper end of a hollow connecting pipe, sequentially connecting the upper water-stopping air bag component, the drill rod, the water pumping component, the drill rod and the lower water-stopping air bag component into a test component, the air bags of the upper water stopping air bag assembly are communicated with an inflation pipe, a pressure measuring pipe and a water return pipe are respectively communicated with a first hollow pipe and a second hollow pipe, the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly are communicated with each other through air pipes, the communication position of the air bags and the inflation pipe, the communication position of the pressure measuring pipe and the first hollow pipe, the communication position of the water return pipe and the second hollow pipe and the communication position of the air bags and the air pipes are all sealed, gas is pre-filled in the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly, the pressure is kept at 0.3-0.7 MPa, and the inflation pipe is positioned at the upper end of the air bags of the upper water stopping air bag;
4) the test component is put into the drill hole according to the sequence of the lower water stop air bag component, the water pumping component and the upper water stop air bag component, and the pressure measuring pipe is ensured to extend out of the upper end of the drill hole;
5) pressurizing air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly, expanding the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly after pressurization, and sealing a drilled hole for pressurization and water stopping, wherein the pressure of the expanded air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly is 2-2.5 MPa;
6) checking after water stopping, injecting water into the drill hole at the upper part of the water stopping air bag component, maintaining for a certain time, and observing whether the water level in the pressure measuring pipe rises or not; or starting the variable frequency water pump to pump water, and observing whether the water level at the upper part of the water stopping air bag component on the piezometric tube descends or not after the water pumping is stopped; if the water is not changed, the water stopping is successful;
7) starting a variable frequency water pump to pump water, controlling the water pumping amount by using a water pump variable frequency control cabinet, starting a water return pipe to return water when the water pumping amount exceeds the control range of the water pump variable frequency control cabinet so as to reduce the water outlet amount, measuring the water level in a pressure measuring pipe in the water pumping process, and performing a water pumping test and water level recovery observation according to requirements;
8) after the water pumping test and the water level recovery observation are finished, releasing pressure of the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly to enable the air bags to retract, lifting the test assembly to the next test layer, and repeating the step 5), the step 6) and the step 7), namely finishing the layered water pumping test among different test layers.
Specifically, in step 8), if the thickness of the next test layer is smaller than the thickness of the current test layer, or is larger than the thickness of the current test layer but a complete well pumping test needs to be performed, the test assembly should be taken out of the drill hole before being lifted to the next test layer, and the length between the upper water stop airbag assembly and the upper water stop airbag assembly is readjusted.
Specifically, if water sampling is required, determining the length between the upper test layer and the lower test layer according to the length of the short test segment, and repeating the steps 5) to 8) from bottom to top in sequence. The method can perform multiple layering tests according to actual needs after the holes are formed at one time, can save repeated work of repeated hole washing, installation and the like of multiple subsection tests, saves the step of casing running, simplifies the operation flow, saves the construction period and has high operability.
Drawings
FIG. 1 is a schematic structural view of the present invention, wherein area A represents a relative water barrier and area B represents a test layer (aquifer), wherein the system floor portion is not shown;
FIG. 2 is a schematic structural view of the water stop airbag module;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic structural view of a lower water stop bladder assembly;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a schematic view of the ground portion of the present invention;
the symbols in the figures are respectively represented as: 1. an inflation tube; 2. a circuit line; 3. a hollow drill rod; 4. a piezometric tube; 5. a first hollow tube; 6. a third hollow tube; 7. a first air bag interface; 8. an air bag steel ring; 9. an air bag; 10. an upper stop airbag assembly; 11. a hollow connecting pipe; 12. a second air bag interface; 13. a water pumping assembly; 14. a variable frequency water pump; 15. a water-through cover; 16. a third air bag interface; 17. a lower water stop bladder assembly; 18. a connecting pipe; 19. a second hollow tube; 20. a water return pipe; 21. a backwater control valve; 22. a water outlet control valve; 23. a water outlet pipe; 24. a water meter; 25. a nitrogen control valve; 26. a water pump variable frequency control cabinet; 27. a voltage regulator; 28. a power supply device; 29. high-pressure nitrogen supply equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "one end", "the other end", "both ends", "between", "middle", "lower", "upper", "lower", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
FIG. 1 is a schematic structural view of the present invention in use, wherein area A represents a relative water barrier and area B represents a test layer (aquifer), wherein the ground portion of the system is not shown; FIG. 2 is a schematic structural view of the water stop airbag module; FIG. 3 is a top plan view of the top stop airbag assembly of FIG. 2; FIG. 4 is a schematic structural view of a lower water stop bladder assembly; FIG. 5 is a top view of the lower water stop bladder assembly of FIG. 4; FIG. 6 is a schematic structural view of the ground portion of the present invention in use;
the air bag type stratified water pumping test system for the same-diameter drilled holes as shown in fig. 1-6 at least comprises an upper water stop air bag component 10, a water pumping component 13 and a lower water stop air bag component 17 which are connected in sequence, wherein the upper water stop air bag component 10 is communicated with the water pumping component 13 (a water outlet end).
In this system, as a first core structure of the system, the upper water stopping airbag module 10 is installed at a position of a ceiling of a test bed (aquifer) in use, and is used for stopping water on the top of the test bed (aquifer).
Specifically, the upper stop water air bag component 10 is composed of two air bag steel rings 8 and an air bag 9 which is connected between the two air bag steel rings 8 in a sealing way. The air bag steel ring 8 is of a steel structure and is integrally annular, the air bag steel ring is arranged at the upper end and the lower end of the air bag 9 and plays a role in supporting and limiting the air bag 9 to ensure the length of the expanded air bag 9, and the air bag steel ring 8 can be made of high-strength and corrosion-resistant stainless steel materials such as stainless steel 304 and 316 and nickel-chromium alloy steel (such as 04Cr13Ni8Mo2 Al); the air bag 9 is used as an expansion part and needs to extend into a drill hole, so that a rubber air bag can be adopted, the rubber air bag is preferably made of reinforced rubber to meet the requirements of smoothness, wear resistance, enough elasticity, high strength, corrosion resistance and the like, the reinforced rubber can be made of (1000, 1100) denier polyester fiber fabric, polyvinyl chloride (PVC), Polyethylene (PE) and other materials, and when the material is not polyvinyl chloride (PVC), a polyvinyl chloride protective layer can be plated on the surface of the reinforced rubber to enhance the wear resistance and the corrosion resistance. In some embodiments, during the actual use of the balloon 9, the strength of the balloon 9 is at least 3MPa or more, considering the pressure in the borehole, i.e. the minimum pressure of the balloon 9 after expansion is not less than 3 MPa. In some embodiments, to ensure that the balloon 9 can move smoothly into and out of the borehole, the diameter of the balloon 9 before inflation (in its original state) should be less than 1-2cm of the borehole diameter. In some embodiments, the diameter of the balloon 9 before inflation (in its original state) is less than 1.5cm of the borehole diameter.
In some embodiments, the upper water stopping air bag assembly 10 is provided with a hollow connecting pipe 11, the hollow connecting pipe 11 is vertically arranged, and two ends of the hollow connecting pipe 11 penetrate through the upper water stopping air bag assembly, that is, the hollow connecting pipe 11 is arranged in the air bag 9 and isolated from the air bag 9 and is not communicated with the inside of the air bag 9, the upper end and the lower end of the hollow connecting pipe 11 extend out of the air bag 9 and the air bag steel ring 8, the position where the upper end and the lower end of the hollow connecting pipe 11 extend out of the air bag 9 should be sealed, for example, sealed by using sealant, so as to ensure the isolation of the test layer, the upper end of the hollow connecting pipe 11 can be provided with a (male-female) joint for communicating. In some embodiments, a hollow connecting tube 11 is preferably disposed in the middle of the airbag 9 to ensure that the upper stop airbag assembly 10 is balanced when it is upright after connection, and the pressure of the sidewall around the drill hole is consistent. In some embodiments, the hollow connecting tube 11 is preferably made of stainless steel tube, which ensures strength and corrosion resistance for long-term use. In some embodiments, the hollow connecting tube can be directly replaced by a drill rod for the convenience of installation and the simplification of the process.
In some embodiments, the upper stop airbag module 10, i.e. the airbag 9, is further provided with a first hollow tube 5 isolated from the airbag 9, the first hollow tube 5 is vertically arranged, the upper end and the lower end of the water stopping air bag component 10, namely an air bag steel ring 8, extend out of the lower end of the first hollow pipe 5 and then are communicated with a test layer (containing aquifer), the upper end of the first hollow pipe 5 is communicated with a pressure measuring pipe 4, the upper end of the first hollow pipe 5 can be provided with a (male-female) joint, the pressure measuring pipe 4 is provided with a (male-female) joint matched with the pressure measuring pipe, the pressure measuring pipe and the joint are communicated through the joint, the joint connection part is sealed by using a sealing strip, a sealing rubber strip and a, the pressure measuring pipe 4 extends out of the upper end of the drill hole, the lower end of the pressure measuring pipe 4 is communicated with a test layer (aquifer) through a first hollow pipe 5, the pressure measuring pipe is used for detecting the pressure in a test layer (aquifer), and water level monitoring equipment such as a universal meter and a water level sensor can be arranged in the pressure measuring pipe 4 and used for monitoring the water level in the pipe. In some embodiments, the first hollow tube 5 can be made of a steel tube, such as a stainless steel tube, and the position of the upper and lower ends of the first hollow tube 5 extending out of the air bag 9 should be sealed, such as by using a sealant, to ensure the isolation of the test layer. In some embodiments, the pressure measuring tube 4 may be a PVC tube.
In some embodiments, a second hollow tube 19 isolated from the airbag 9 is further disposed in the upper water stopping airbag assembly 10, i.e., the airbag 9, the second hollow tube 19 is disposed vertically, both upper and lower ends of the second hollow tube 19 penetrate through the upper water stopping airbag assembly 10, i.e., the airbag steel ring 8, the lower end of the second hollow tube 19 extends out and then is communicated with a test layer (aquifer), the upper end of the second hollow tube 19 extends out and then is communicated with an external water return tube 20 for returning water, a (male-female) joint is disposed at the upper end of the second hollow tube 19, the water return tube 20 is disposed with a (male-female) joint adapted thereto, the two are communicated through the joint, and the joint connection is sealed, e.g., by; in some embodiments, the second hollow tube 19 may be made of a steel tube, such as a stainless steel tube, and the upper and lower ends of the second hollow tube 19 are sealed, such as by a sealant, at the position where they extend out of the air bag 9, so as to ensure the isolation of the test layer.
In some embodiments, the upper water stop airbag module 10, i.e. the airbag 9, is further provided with a third hollow tube 6 isolated from the airbag 9, the third hollow tube 6 can be used for a circuit wiring tube of a water pumping module for wiring and protection of electric wires of the water pumping module, both upper and lower ends of the third hollow tube 6 penetrate through the upper water stop airbag module 10, i.e. the airbag steel ring 8, the third hollow tube 6 is also preferably vertically arranged, and can also be made of a steel tube, such as a stainless steel tube, and the position where the upper and lower ends of the third hollow tube 6 extend out of the airbag 9 should be sealed, such as sealing with sealant, so as to ensure the isolation of the test layer.
In the gasbag formula layering test system that draws water of driling with footpath, as the second core structure of system, lower stagnant water gasbag subassembly 17 sets up in the bottom plate position of experimental layer (aquifer) when using for to the bottom stagnant water of experimental layer (aquifer), prevent that the aquifer of next layer from producing the change of water sample, pressure with experimental layer intercommunication, influence experiment.
Specifically, the lower water-stopping air bag component 17 is also composed of two air bag steel rings 8 and an air bag 9 which is connected between the two air bag steel rings 8 in a sealing way. The material, size, structure, parameters, etc. of the air bag 9 and the air bag steel ring 8 are the same as those of the air bag 9 and the air bag steel ring 8 of the upper stop water air bag module 10, and the contents of the air bag 9 and the air bag steel ring 8 of the upper stop water air bag module 10 can be specified.
In some embodiments, the lower water-stopping air bag module 17, that is, the air bag 9 of the lower water-stopping air bag module 17, is provided with a connecting pipe 18 with a closed lower end, the connecting pipe 18 is preferably vertically arranged, the upper end of the connecting pipe extends out of the air bag steel ring 8 of the lower water-stopping air bag module 17 and can be connected with the water pumping module 13, and the connecting pipe 18 is a hollow pipe with the same structure as the hollow connecting pipe 11, so that the weight of the system can be reduced, the water pumping module is prevented from being damaged. In some embodiments, the connecting tube 18 is preferably disposed in the middle of the air bag 9 of the lower water-stop air bag assembly 17 to ensure that the lower water-stop air bag assembly 17 keeps balance when being vertical after being connected and the pressure of the side wall around the drill hole is consistent. In some embodiments, the connecting tube 18 is preferably a stainless steel tube, which ensures strength and corrosion resistance for long-term use. In some embodiments, the connection tube 18 may be directly replaced with a drill rod for ease of installation and simplicity of the process. As a core water stop structure of a top bottom plate of a drilling test layer (aquifer), air bags 9 in an upper water stop air bag assembly 10 and a lower water stop air bag assembly 17 need to be inflated and deflated, and the inflation and deflation amounts of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 need to be ensured to be consistent, the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 need to be communicated with each other, namely the air bags 9 of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 need to be communicated with each other, therefore, a first air bag interface 7 and a second air bag interface 12 which are communicated with the air bags 9 of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 are respectively arranged at the upper end and the lower end of the air bags 9 of the lower water stop air bag assembly 17, the second air bag interface 12 and the third air bag interface 16 are communicated with each other through an air pipe, the first air bag interface 7 can be, and a sealing adhesive tape and a sealant are arranged at the communicated position for sealing treatment, and the air bags 9 of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 form a communicated structure, so that the air bags 9 of the upper water stop air bag assembly and the lower water stop air bag assembly can keep the same inflation and deflation speed and capacity in the inflation and deflation process, the synchronous retraction or expansion of the upper water stop air bag assembly and the lower water stop air bag assembly can be ensured, and the equivalent water stop of the upper end and the.
Aiming at the test with large drilling depth or the test layer with larger thickness, the hollow drill rod 3 can be communicated between the connecting pipe 18 and the water pumping component 13 and/or the upper end (connected with the water outlet pipeline) of the hollow connecting pipe 11 for lengthening the whole length of the system, the distance between the upper water stop air bag component 10 and the lower water stop air bag component 17 can be changed, the water pumping device is suitable for the test layers with different drilling depths and different thicknesses, and meanwhile, the water pumping device can also be suitable for being used when the water pumping test of a complete well needs to be carried out.
As another core structure in the gasbag-type stratified pumping test system of the same-diameter drilling, the pumping component 13 is used for pumping water to the test layer (aquifer), the pumping component 13 is used as a water pumping machine, a deep well pump, a submersible pump, a deep well pull rod pump and the like can be used as pumping equipment, and can be selected as required, because the pumping component 13 needs to be deeply drilled, the upper water stopping gasbag component 10 and the lower water stopping gasbag component 17 need to be connected, and most of the pumping equipment can not bear the weight, therefore, the pumping component 13 needs to be provided with some auxiliary parts for fixing the pumping equipment, and the connection with the upper water stopping gasbag component 10 and the lower water stopping gasbag component 17 is realized.
Specifically, the water pumping assembly 13 includes a water passing cover 15 and a variable frequency water pump 14 disposed inside the water passing cover 15. Frequency conversion water pump 14 has the frequency conversion function, can change the water pump water yield, the whole water yield of governing system, it can be selected for any one in last deep-well pump, immersible pump, deep well pull rod pump, water cover 15 is as the auxiliary member for bearing and fixed frequency conversion water pump 14, frequency conversion water pump 14 sets up inside water cover 15, fixing and protection that can be fine, and water cover 15 surface sets up the limbers, the hole, clearance etc. in order to realize the limbers function, it is not influenced to guarantee that frequency conversion water pump 14 draws water. In some embodiments, the water passing cover 15 is a steel grating steel cover, which can be welded by a plurality of steel bars and steel plates, and the surface forms a grating-shaped water passing gap, some fixing plates can be welded in the grating steel cover 15, and the variable frequency water pump 14 is fixed on the fixing plates by adopting a bolt connection, a buckle connection, a screw connection, and the like. In some embodiments, the upper and lower ends of the water passing cover 15 can be fixedly connected with the pipe connectors for connecting with the upper water stopping air bag assembly 10 and the lower water stopping air bag assembly 17, the pipe connectors can be male and female screw connectors, screw threads, flanges, threaded pipes, reducer pipes, clamping sleeves and the like, specifically, the upper end of the water passing cover 15 is provided with a 50mm female screw connector, the lower end of the water passing cover 15 is provided with a 50mm male screw connector, the lower end of the hollow connecting pipe 11 is provided with a 50mm male screw connector matched with the 50mm female screw connector, the upper end of the connecting pipe 18 is provided with a 50mm female screw connector matched with the 50mm male screw connector, the pipe connectors at the upper and lower ends of the water passing cover 15 are matched and connected with the hollow connecting pipe 11 and the connecting pipe 18 through the male and female screw connectors, the upper water stopping air bag assembly 10, the water pumping assembly 13 and the lower water stopping air bag assembly 17 are sequentially communicated or connected, and the joints with the hollow connecting pipe, sealing tape, sealant strips or sealants may be used for sealing. In some embodiments, the water outlet end of the variable frequency water pump 14 is in sealed communication with a pipe connector at the upper end of the water passing cover 15, and is used for outputting the pumped water to the upper water stopping air bag assembly 10, namely the hollow connecting pipe 11, through the pipe connector.
Based on fig. 1-6 and the above description, the air bag type stratified water pumping test system for the same-diameter drilling hole further comprises an air charging and discharging control system, a ground frequency conversion control system and a water outlet pipeline system, and the three systems will be described in detail respectively below.
In the pumping test system, the inflation and deflation control system is mainly used for inflating and deflating the air bags of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 and mainly comprises a high-pressure nitrogen gas supply device 29, wherein the high-pressure nitrogen gas supply device 29 is arranged on the ground at the upper end of a drill hole and is communicated with the air bag 9 of the upper water stop air bag assembly 10 through an inflation tube 1. The high-pressure nitrogen gas supply device 29 is used for supplying high-pressure nitrogen gas, and can be a high-pressure nitrogen gas tank, a high-pressure nitrogen gas generator and the like, the high-pressure nitrogen gas supply device 29 can also adopt other gases (the gases can ensure the timely retraction of the air bag), but the nitrogen gas has low density, is insoluble in water and harmless, can simplify the inflation and deflation device and process, and has high safety, so that the system adopts the nitrogen gas as the air bag medium. The high-pressure nitrogen gas supply device 29 is communicated with the air bag 9 of the upper water stop air bag assembly 10 through a special air pressure pipe as an inflation pipe 1. In some embodiments, the high-pressure nitrogen gas supply device 29 is communicated with the air bag 9 of the upper water stopping air bag assembly 10, that is, the first air bag interface 7 of the air bag 9 of the upper water stopping air bag assembly 10, the communication is hermetically connected through a bolt, and a nitrogen gas control valve 25 can be arranged at the gas outlet end of the high-pressure nitrogen gas supply device or on the inflation tube 1 to control the nitrogen gas flow and close the inflation tube 1.
In the pumping test system, the ground frequency conversion control system is arranged on the ground at the upper end of the drill hole and comprises a power supply device 28, a voltage stabilizer 27 and a water pump frequency conversion control cabinet 26 which are electrically connected in sequence, and the water pump frequency conversion control cabinet 26 is electrically connected with the frequency conversion water pump 14 through a circuit line 2. Power supply unit 28 mainly used is to water pump frequency conversion switch board 26 and frequency conversion water pump 14 power supply, can be the generator, the battery etc., stabiliser 27 is connected in power supply unit 28's power supply end, be used for stabilizing voltage, water pump frequency conversion switch board 26 then is used for controlling frequency conversion water pump 14's the power of drawing water, in order to change the water yield, power supply unit 28, stabiliser 27 and water pump frequency conversion switch board 26 are prior art's structure, its inner structure, circuit etc. all can utilize prior art to realize, do not do too much explanation here again. In some embodiments, the circuit wires 2 can be routed through the third hollow tube 6.
In the pumping test system, the water outlet pipeline system is arranged on the ground at the upper end of the drilling hole and comprises a water outlet pipe 23 communicated with the upper end of the hollow connecting pipe 11, and a water outlet control valve 22 and a water meter 24 are arranged on the water outlet pipe 23. The water outlet pipe 23 is used for being communicated with the hollow connecting pipe 11, so that the variable frequency water pump 14 and the hollow connecting pipe 11 are communicated to form an independent water outlet pipeline system, test layer water pumped by the variable frequency water pump 14 is pumped out through the hollow connecting pipe 11 and the water outlet pipe 23 to carry out a water sample test and the like, and meanwhile, the water outlet pipe 23 can be provided with a water outlet control valve 22 and a water meter 24 for controlling and detecting water quantity. In some embodiments, the hollow connecting pipe 11 and the water outlet pipe 23 can be communicated with the hollow drill rod 3 to adapt to the use of deeper drilling. In some embodiments, the water outlet pipe 23 may be further communicated with the water return pipe 20, when the water output controlled by the variable frequency water pump 14 cannot meet the requirement, or when water return is required, the water outlet pipe 23 may be communicated with the water return pipe 20 to return water, so as to assist in reducing the water output and simplifying the water return pipeline, and the water quality inconvenience in the test bed may also be ensured by using the pumped water return water. In some embodiments, a return control valve 21 may be disposed at the position where the outlet pipe 23 communicates with the return pipe 20 to control the amount of return water.
When the system is used, firstly, all the components of the system and the system are connected according to the above records and then are put into the drill hole, so that the water pumping component 13 is positioned in a test layer (aquifer), the upper water stop air bag component 10 and the lower water stop air bag component 17 are respectively positioned at the top plate and the bottom plate of the test layer (aquifer), namely in the opposite water barriers at the upper end and the lower end of the test layer (aquifer), the air bags 9 in the upper water stop air bag component 10 and the lower water stop air bag component 17 are controlled to retract or expand by the inflation and deflation control system, the diameter of the air bag 9 after retraction is smaller than the aperture of the drill hole, so that the depths of the upper water stop air bag component 10, the water pumping component 13 and the lower water stop air bag component 17 in the drill hole can be conveniently taken out or adjusted, thereby simplifying the loading and unloading process or carrying out the water pumping and injecting tests on different test layers, the diameter of the expanded air bag 9 is larger than the bore diameter of the drilled hole, so that a test layer (water-bearing layer) where the water pumping assembly 13 is located can be isolated from the relative water barriers at the upper end and the lower end, the isolated water pumping assembly 13 controls the frequency conversion water pump 14 to be opened and closed and adjusts working power under the control of a ground frequency conversion control system to pump water, the pumped water is output by the water outlet pipeline system, water returns through the water return pipe 20 during water injection, the lower end of the relative water barrier where the upper water stopping air bag assembly 10 is located is closed, and the water injection test can be carried out on the upper end of the relative water barrier.
The system is based on the technical characteristics, the whole structure of the system is simple, the number of accessories is small, compared with the prior art system or equipment, the cost is reduced by 60% -80%, the achieved effect is slightly superior to that of the prior art system or equipment, the system cost is greatly reduced, the continuous water pumping test of any layer with different depths in the same aperture can be conveniently realized, multiple chambering or diameter expanding is not needed for drilling, the depth of a test layer is not needed to be considered, the system is convenient to use, strong in operability, time-saving and labor-saving, meanwhile, the water stopping structure is simplified by the structural design of the upper water stopping air bag component 10 and the lower water stopping air bag component 17, the water stopping effect is obviously superior to that of the prior art, water stopping can be carried out on the test layer with different depths, the water stopping effect is good, and on water stopping, the relative positions of the upper water stopping air bag component 10 and the lower water stopping air bag component 17 can be, with accurate control test layer top bottom plate degree of accuracy, can effectively avoid strideing across the great stratum of osmotic coefficient difference and cause and mix and draw water, improved the precision of test result, and the stagnant water adopts the gasbag as main stagnant water structure, fill gassing time short, the stagnant water is reliable, instant, effectively solve the problem that the stagnant water material of the system need wait for the certain time to enlarge, this system still can regard as the water intaking ware to take the water sample in succession in segmentation behind disposable pore-forming simultaneously, realize taking of different levels water sample, easy operation is convenient.
In order to better implement and use the system, the invention also provides a brand-new airbag type stratified water pumping test method for the same-diameter drilled holes based on the airbag type stratified water pumping test system for the same-diameter drilled holes, and the method comprises the following steps:
1) and drilling to form a hole, wherein the hole diameter of the drilled hole is 10-20mm larger than the initial diameter of the air bag of the upper water stop air bag assembly or the lower water stop air bag assembly, the hole wall is ensured to be straight and smooth in the drilling process, the hole diameter of the drilled hole is preferably not smaller than 130mm, so that the system can realize the water pumping test effect to the maximum extent, and the drilled hole can be washed by a long drill after being drilled.
2) Checking the air bag 9 tightness of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17, wherein the air bag 9 tightness can ventilate and maintain pressure for a certain time to the air bags 9 of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 through a high-pressure nitrogen gas supply device 29, and then, whether the pressure in the air bags 9 of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 is reduced or not is seen. The joints between the first hollow tube 5, the second hollow tube 19, the third hollow tube 6, the hollow connecting tube 11 and the air bag 9 of the upper water stop air bag assembly 10 are sealed, the joints between the first hollow tube 5, the second hollow tube 19, the third hollow tube 6, the hollow connecting tube 11 and the air bag 9 of the upper water stop air bag assembly 10 can be generally sealed by smearing sealant, winding sealing adhesive tapes or sealing adhesive tapes, water can be poured at the sealed positions after sealing, and whether the water level is reduced or not is seen so as to detect the sealing effect.
3) Firstly, determining the position of a test layer in a drill hole, connecting a hollow drill rod 3 between a water pumping assembly 13 and a lower water stop air bag assembly 17 and the upper end of a hollow connecting pipe 11, sequentially connecting an upper water stop air bag assembly 10, the hollow drill rod 3, the water pumping assembly 13, the hollow drill rod 3 and the lower water stop air bag assembly 17 into a test assembly, adding the hollow drill rod 3 among the water pumping assembly 13, the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 according to the requirement, and adding the hollow drill rod 3 or adding the hollow drill rod among partial parts when the drilling depth is low. Secondly, the air bag 9 of the upper water stop air bag assembly 10 is communicated with the inflation tube 2, the pressure measuring tube 4 and the water return tube 20 are respectively communicated with the first hollow tube 5 and the second hollow tube 19, the air bags 9 of the upper water stop air bag assembly 10 and the lower water stop air bag assembly 17 are communicated with each other through air tubes, and the communication position of the air bags 9 and the inflation tube 2, the communication position of the pressure measuring tube 4 and the first hollow tube 5, the communication position of the water return tube 20 and the second hollow tube 19, and the communication position of the air bags 9 and the air tubes are all subjected to sealing treatment through bolts, sealing glue, sealing adhesive tapes. And then, the air bags 9 of the upper water stopping air bag assembly 10 and the lower water stopping air bag assembly 17 are pre-filled with gas and kept at the pressure of 0.3-0.7 MPa, so that the air bags 9 can be smoothly discharged into the holes without being shrunk and extruded together, and the problem that the water stopping effect is poor or the water stopping is completely ineffective due to insufficient inflation and expansion of the lower holes can be avoided. Finally, an inflation tube 2 with the air bag retraction length being 1.5-2 times longer is reserved at the upper end of the air bag 9 of the upper water stop air bag assembly 10, so that the inflation tube 2 is prevented from being broken when the air bag 9 is expanded and shortened;
4) a test component is put into the drill hole according to the sequence of the lower water stop air bag component 17, the water pumping component 13 and the upper water stop air bag component 10, the pressure measuring pipe 4 is ensured to extend out of the upper end of the drill hole, the upper end of the hollow connecting pipe 11 is connected with a tee joint, two ends of the tee joint are respectively communicated with a water outlet pipe 23 and a water return pipe 20, and the water return pipe 20 is ensured to be in a closed state; in the step, the test assembly is not connected, when the water is discharged, the lower water-stopping air bag assembly 17 can be firstly put into the hole, then the hollow drill rod 3 is selectively connected, the water pumping assembly 13 is connected after the lower water-stopping air bag assembly is deeply inserted into the hole after the connection, the hollow drill rod 3 is selectively connected after the lower hole of the water pumping assembly 13 is discharged until the upper water-stopping air bag assembly 10 is installed, the height of the drilling machine can be controlled to be 6m at the maximum, and the length of the single connecting rod is smaller than 6m, so that the method adopts the mode of connecting the lower hole while considering the connectivity, the stability, the high efficiency and the actual operability among all the structures. 5) Pressurizing the air bags 9 of the upper water stopping air bag assembly 10 and the lower water stopping air bag assembly 17, expanding the air bags 9 of the upper water stopping air bag assembly 10 and the lower water stopping air bag assembly 17 after pressurization, and sealing the drilled hole for pressurization and water stopping, wherein the pressure of the expanded air bags 9 of the upper water stopping air bag assembly 10 and the lower water stopping air bag assembly 17 is 2-2.5 MPa;
6) checking after water stopping, injecting water into the drill hole at the upper part of the water stopping air bag component 13, maintaining for a certain time, and observing whether the water level in the piezometer tube 4 rises or not; or starting the variable frequency water pump 14 to pump water, and observing whether the water level at the upper part of the upper water stopping air bag component 10 is reduced or not after the water pumping is stopped; if the water is not changed, the water stopping is successful;
7) the variable frequency water pump 14 is started to pump water, the water pump variable frequency control cabinet 26 is used for controlling the water pumping amount, the water return pipe 20 is started to return water when the water pumping amount exceeds the control range of the water pump variable frequency control cabinet 26 to reduce the water outlet amount, the water level in the pressure measuring pipe 4 is measured by a universal meter in the water pumping process, the water level can also be measured by a water level sensor, and a water pumping test and water level recovery observation are carried out according to requirements;
8) after the water pumping test and the observation of water level recovery are completed, releasing pressure of the air bags 9 of the upper water stopping air bag assembly 10 and the lower water stopping air bag assembly 17 to enable the air bags 9 to retract, lifting the test assembly to the next test layer, and repeating the step 5), the step 6) and the step 7), namely completing the layered water pumping test among different test layers. In this step, if the thickness of the next test layer is smaller than the thickness of the current test layer, or is larger than the thickness of the current test layer but a complete well pumping test needs to be performed, the test assembly should be taken out to drill a hole before being lifted to the next test layer, and the length between the upper water stop air bag assembly and the upper water stop air bag assembly is readjusted.
In the method, if the water sample is used, the length between an upper test layer and a lower test layer is generally determined according to the length of a short test section, and the steps 5) to 8) are sequentially repeated from bottom to top. When needing to take water sample in succession promptly, can need not to pull out again and adjust the length between last stagnant water gasbag subassembly 10 and lower stagnant water gasbag subassembly 17, nevertheless in order to avoid the section length too long to cause the aquifer to stride the layer and form the mixture and draw water, go up the length that fixed is the short test section between going up stagnant water gasbag subassembly 10 and lower stagnant water gasbag subassembly 17, can follow supreme water stopping and drawing water in proper order down, only this section length longer test section is incomplete well and is drawn water this moment.
By the method, multiple layering tests can be performed after the holes are formed at one time, repeated work of repeated hole washing, installation and the like of multiple segmentation tests can be saved, a step of casing running is omitted, a test flow is simplified, and construction period and cost are saved.
The above description is an embodiment of the present invention. The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (10)
1. An air bag type layered water pumping test system for drilling holes in the same diameter is characterized by comprising an upper water stopping air bag component, a water pumping component and a lower water stopping air bag component which are sequentially arranged; the upper water stopping air bag component is provided with a hollow connecting pipe, two ends of the hollow connecting pipe penetrate through the upper water stopping air bag component, and the lower end of the hollow connecting pipe is communicated with the water pumping component; the lower water stop air bag component is provided with a connecting pipe with a sealed lower end, and the upper end of the connecting pipe extends out of the lower water stop air bag component and is connected with the water pumping component;
wherein the content of the first and second substances,
the upper water stopping air bag component and the lower water stopping air bag component are communicated with each other, the upper water stopping air bag component is further provided with a first hollow pipe and a second hollow pipe which penetrate through the upper water stopping air bag component, the upper end of the first hollow pipe is communicated with a pressure measuring pipe, and the upper end of the second hollow pipe is communicated with a water return pipe.
2. The system as claimed in claim 1, wherein the upper and lower water stop airbag modules are composed of two airbag steel rings and an airbag hermetically connected between the two airbag steel rings, and the airbags of the upper and lower water stop airbag modules are communicated with each other through an air tube.
3. The system of claim 2, wherein the airbag type stratified pumping test system for the bore holes with the same diameter further comprises a high-pressure nitrogen gas supply device, the high-pressure nitrogen gas supply device is communicated with the airbag of the upper water stop airbag assembly through an inflation pipe, and a nitrogen gas control valve is further arranged on the inflation pipe.
4. The system of claim 1, wherein a drill rod is communicated between the connecting pipe and the water pumping assembly and/or at the upper end of the hollow connecting pipe.
5. The system as claimed in claim 1, wherein the water pumping assembly comprises a water passing cover and a variable frequency water pump arranged inside the water passing cover, the upper end and the lower end of the water passing cover are respectively provided with a pipe connector connected with the hollow connecting pipe and the connecting pipe, and the water outlet end of the variable frequency water pump is in sealed communication with the pipe connector at the upper end of the water passing cover.
6. The system of claim 5, wherein the water stop airbag assembly is further provided with a third hollow tube, and circuit lines of the variable frequency water pump are routed through the inside of the third hollow tube.
7. The system of claim 1, wherein the co-diameter drilled airbag type stratified pumping test system further comprises a water outlet pipeline system, the water outlet pipeline system comprises a water outlet pipe communicated with the upper end of the hollow connecting pipe, a water outlet control valve and a water meter are arranged on the water outlet pipe, the water return pipe is communicated with the water outlet pipe, and a water return control valve is arranged at the communication position of the water return pipe and the water outlet pipe.
8. The air bag type layered water pumping test method for the same-diameter drilled holes is characterized by comprising the following steps of:
1) drilling to form a hole, wherein the hole diameter of the drilled hole is not less than 130mm, and is 10-20mm larger than the initial diameter of the air bag of the upper water stop air bag assembly or the lower water stop air bag assembly, the hole wall is ensured to be smooth and straight in the drilling process, and the hole is washed after the drilling is finished;
2) checking the air bag tightness of the upper water stopping air bag assembly and the lower water stopping air bag assembly, and sealing the joints between the first hollow pipe, the second hollow pipe, the third hollow pipe, the hollow connecting pipe and the air bags of the upper water stopping air bag assembly;
3) determining the position of a test layer in a drill hole, connecting a drill rod between the water pumping component and the lower water-stopping air bag component and the upper end of a hollow connecting pipe, sequentially connecting the upper water-stopping air bag component, the drill rod, the water pumping component, the drill rod and the lower water-stopping air bag component into a test component, the air bags of the upper water stopping air bag assembly are communicated with an inflation pipe, a pressure measuring pipe and a water return pipe are respectively communicated with a first hollow pipe and a second hollow pipe, the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly are communicated with each other through air pipes, the communication position of the air bags and the inflation pipe, the communication position of the pressure measuring pipe and the first hollow pipe, the communication position of the water return pipe and the second hollow pipe and the communication position of the air bags and the air pipes are all sealed, gas is pre-filled in the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly, the pressure is kept at 0.3-0.7 MPa, and the inflation pipe is positioned at the upper end of the air bags of the upper water stopping air bag;
4) the test component is put into the drill hole according to the sequence of the lower water stop air bag component, the water pumping component and the upper water stop air bag component, and the pressure measuring pipe is ensured to extend out of the upper end of the drill hole;
5) pressurizing air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly, expanding the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly after pressurization, and sealing a drilled hole for pressurization and water stopping, wherein the pressure of the expanded air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly is 2-2.5 MPa;
6) checking after water stopping, injecting water into the drill hole at the upper part of the water stopping air bag component, maintaining for a certain time, and observing whether the water level in the pressure measuring pipe rises or not; or starting the variable frequency water pump to pump water, and observing whether the water level at the upper part of the water stopping air bag component on the piezometric tube descends or not after the water pumping is stopped; if the water is not changed, the water stopping is successful;
7) starting a variable frequency water pump to pump water, controlling the water pumping amount by using a water pump variable frequency control cabinet, starting a water return pipe to return water when the water pumping amount exceeds the control range of the water pump variable frequency control cabinet so as to reduce the water outlet amount, measuring the water level in a pressure measuring pipe in the water pumping process, and performing a water pumping test and water level recovery observation according to requirements;
8) after the water pumping test and the water level recovery observation are finished, releasing pressure of the air bags of the upper water stopping air bag assembly and the lower water stopping air bag assembly to enable the air bags to retract, lifting the test assembly to the next test layer, and repeating the step 5), the step 6) and the step 7), namely finishing the layered water pumping test among different test layers.
9. The method according to claim 8, wherein in step 8), if the thickness of the next test layer is smaller than the thickness of the current test layer, or is larger than the thickness of the current test layer but a complete well pumping test is required, the test assembly is taken out of the drilled hole and the length between the upper water stop air bag assembly and the upper water stop air bag assembly is readjusted before the next test layer is lifted.
10. The method of claim 8, wherein if water sampling is required, the length between the upper test layer and the lower test layer is determined according to the length of the shorter test layer, and the steps 5) to 8) are repeated from bottom to top.
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| CN114922634A (en) * | 2022-05-25 | 2022-08-19 | 中铁一局集团(广州)建设工程有限公司 | Freezing pore-forming construction method in tunnel construction process |
| CN115653532A (en) * | 2022-11-16 | 2023-01-31 | 东营孚瑞特能源设备有限公司 | Diameter-variable temporary plugging device for oil pipe |
| CN117027771A (en) * | 2023-08-28 | 2023-11-10 | 河北省地质矿产勘查开发局第一地质大队(河北省清洁能源应用技术中心) | Geothermal investigation and geothermal temperature measuring device |
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