CN110984960A - Jacking type layered water pumping and injecting test system and method for same-diameter drilling - Google Patents
Jacking type layered water pumping and injecting test system and method for same-diameter drilling Download PDFInfo
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- CN110984960A CN110984960A CN201911135196.4A CN201911135196A CN110984960A CN 110984960 A CN110984960 A CN 110984960A CN 201911135196 A CN201911135196 A CN 201911135196A CN 110984960 A CN110984960 A CN 110984960A
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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
- E21B47/00—Survey of boreholes or wells
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to a top pressure type layered water pumping and injecting test system for drilling holes with the same diameter, which comprises a sleeve pipe assembly, an upper water stop assembly and a lower water stop assembly which are sequentially connected, wherein a water pump and a pressure measuring pipe are arranged in the sleeve pipe assembly, and the water pump is connected with a water outlet and return pipeline system; go up water stopping subassembly and lower stagnant water subassembly and all include flexible inlet tube, flexible inlet tube outer wall is provided with at least one rubber ball stagnant water stopper, and rubber ball stagnant water stopper can contract or extrusion expansion along with the flexible of flexible inlet tube, goes up the flexible inlet tube of water stopping subassembly and lower stagnant water subassembly and communicates each other, go up the flexible inlet tube of water stopping subassembly with water pump intercommunication in the thimble assembly. Meanwhile, the invention also discloses a top pressure type layered water pumping and injecting test method for the same-diameter drill hole. The invention can perform the layering test according to the stratum to be tested after the hole is formed at one time, accurately control the position of the top bottom plate of the test section, save repeated work of repeated hole washing, installation and the like of multiple subsection tests, and has reliable water stop, simple operation, economy and durability.
Description
Technical Field
The invention relates to a water pumping and injecting test system, belongs to the technical field of geotechnical engineering investigation, and particularly relates to a top pressure type layered water pumping and injecting test system for same-diameter drilling; meanwhile, the invention also discloses a top pressure type layered water pumping and injecting test method for the same-diameter drill hole based on the top pressure type layered water pumping and injecting test system for the same-diameter drill hole.
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 test method for layered water pumping and water injection of the same drill hole 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. 3.
In addition to the above two methods, the equipment currently used in the market has a special layered water pumping system, but the system is expensive, has a plurality of matched equipment, needs special processing for some equipment, is inconvenient to use, has higher comprehensive cost, has extremely expensive overall price, and cannot be used for water injection tests.
Disclosure of Invention
Based on the technical problems, the invention provides a top pressure type layered water pumping and injecting test system for drilling holes in the same diameter, so that the technical problems of high cost, complex structure, complex use process, and poor operability and water stopping effect of the system in the prior art are solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a top pressure type layered water pumping and injecting test system for drilling holes with the same diameter comprises a sleeve pipe assembly, an upper water stopping assembly and a lower water stopping assembly which are sequentially connected, wherein a water pump and a pressure measuring pipe are arranged in the sleeve pipe assembly, and the water pump is connected with a water outlet and return pipeline system; go up water stopping subassembly and lower stagnant water subassembly and all include flexible inlet tube, flexible inlet tube outer wall is provided with at least one rubber ball sealing plug, and rubber ball sealing plug can contract or extrusion expansion along with the flexible of flexible inlet tube, go up water stopping subassembly and lower stagnant water subassembly's flexible inlet tube intercommunication each other, go up water stopping subassembly's flexible inlet tube with water pump intercommunication in the thimble assembly.
Preferably, the telescopic water inlet pipe comprises a telescopic movable hollow pipe and a water inlet pipe communicated with one end of the movable hollow pipe, the rubber ball water stop plug is arranged at the telescopic position of the movable hollow pipe, the water inlet pipes of the upper water stop assembly and the lower water stop assembly are communicated with each other, and the other end of the movable hollow pipe of the upper water stop assembly is communicated with a water pump in the sleeve assembly.
Preferably, the water inlet pipe is a floral tube.
Preferably, the other end of the movable hollow pipe of the lower water stopping assembly is also connected with a tray.
Preferably, the length of the movable hollow tube is more than 1m, and the length of the rubber ball water stop plug is larger than the contracted length of the movable hollow tube and smaller than the stretched length of the movable hollow tube.
Preferably, the sleeve assembly comprises an inner sleeve communicated with the movable hollow tube of the upper water stop assembly and an outer sleeve sleeved outside the inner sleeve, the outer sleeve is fixed in the hole wall of the drilled hole, and the water pump and the pressure measuring tube are both arranged in the inner sleeve.
Preferably, a drill rod is further connected between the water pump and the water return pipeline system, and/or between the upper water stopping assembly and the water inlet pipe of the lower water stopping assembly, and/or at the other end of the movable hollow pipe of the lower water stopping assembly, and the bottom of the drill rod connected with the other end of the movable hollow pipe of the lower water stopping assembly is sealed.
Preferably, the water outlet and return pipeline system comprises a water outlet pipe communicated with the water pump, a water outlet control valve and a water meter are arranged on the water outlet pipe, the water outlet pipe is further communicated with a water return pipe, a water return control valve is arranged on the water return pipe, and a port of the water return pipe extends into the inner sleeve.
Preferably, the diameter of the inner sleeve is 5-20mm smaller than the bore diameter.
Preferably, the water pump is further connected with a voltage stabilizer through a circuit line, and the voltage stabilizer is connected with a power supply.
Preferably, the diameter of the rubber ball water stop plug is 5-25mm smaller than the hole diameter of the drill hole.
Preferably, the total length of the rubber ball water stop plug is 5-10 times of the aperture of the drilled hole.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple structure, can be used without special equipment and special operation, has simple and convenient operation, can be repeatedly used and has low system cost.
2. The invention can perform the layering test according to the stratum to be tested after the hole is formed at one time, accurately control the position of the top and bottom plates of the test section, save repeated work such as repeated hole washing, installation and the like of multiple subsection tests, simplify the use flow and reduce the working hours.
3. The invention adopts a mechanical top-pressing type rubber ball expansion water stopping mode to stop water, has good water stopping effect, high reliability and short water stopping response time, can realize instant water stopping, and can effectively solve the technical defect that the traditional water stopping material needs to be expanded for a certain time.
4. The invention can be used for water injection or water pumping tests, and can be directly changed into a water injection test when the water pumping test cannot be carried out due to too small water quantity, equipment does not need to be installed again, and the water injection test is simple and convenient.
5. The invention can be used for bedrock layered water pumping or water injection test, and the loose layer confined water pumping or water injection test can be carried out after the drill rod between the upper water stopping assembly and the lower water stopping assembly is replaced by the perforated pipe, so that the applicability is wide.
Meanwhile, the invention also provides a top pressure type layered water pumping and injecting test method for the same-diameter drill hole based on the top pressure type layered water pumping and injecting test system for the same-diameter drill hole, and the method comprises the following steps:
1) forming holes
Drilling and forming by using drilling equipment, wherein the aperture of a drilling hole is one to two times larger than that of the test section, then an outer sleeve is put in, so that the drilling is completely finished by reducing the diameter of the test section or the drilling is finished by stages, and the aperture of the test section is not less than 133 mm;
2) hole washing
After drilling, washing the hole, washing the slurry in the hole, and ensuring the hole wall to be smooth and straight;
3) lower water stopping equipment
Measuring the depth position of the test section, determining the length of the drill rod, sequentially discharging the drill rod, the lower water stopping assembly, the drill rod, the upper water stopping assembly and the inner sleeve, blocking the bottom port of the drill rod at the lower end of the lower water stopping assembly, sealing the connection part of the drill rod, the lower water stopping assembly, the drill rod, the upper water stopping assembly and the inner sleeve, and fixing the outer sleeve on the hole wall outside the inner sleeve after discharging.
4) Water stop
The pressurizing device is utilized to support the clamping plate sleeved on the inner sleeve opening and press down, the movable hollow tube is compressed, contracted and shortened, the rubber ball water stopping piece is extruded to deform and expand, the drilling hole is plugged to realize layered water stopping, and the water stopping inspection is carried out by adopting a water level difference method after the water stopping is finished.
5) Water injection test
After the water stopping is finished, if needed, a water reducing head or constant head water injection test can be directly carried out in the inner casing;
6) mounting of corollary equipment
During the water pumping test, the water pump is connected by a drill rod and then is put into the inner sleeve, the piezometric tube is fixed on the drill rod and is synchronously put into the bottom of the inner sleeve, and a circuit line of the water pump is connected with a power supply device.
7) Water pumping test
Starting a water pump to pump water, performing trial pumping and formal pumping of a test section pumping test, and performing water level recovery observation after the pumping test is finished;
8) test of water injection by layer
And after the water pumping test of the test section is finished, repeating the steps 3) to 7), and performing the water pumping and injecting test on the next test section, so that the water pumping and injecting test of the test sections with different depth section positions can be finished.
In step 3), when the test section is a loose layer, the drill rod between the lower water stopping assembly and the upper water stopping assembly is replaced by a wall protecting perforated pipe.
In the step 7), the water outlet control valve and the water return control valve are adopted to repeatedly adjust and control the water outlet quantity of the water pump in the water pumping process so as to control the water level to be lowered, and a multimeter is arranged in the pressure measuring pipe to measure.
The method can perform multiple layering tests according to actual needs after the holes are formed at one time, can save the step of repeatedly washing the holes by multiple segmentation tests, simplifies the operation flow, saves the construction period, and has high operability and simple flow.
Drawings
FIG. 1 is a schematic structural view of the present invention, wherein the areas A and C represent the relative water barriers, respectively, and the area B represents the test layer (aquifer), wherein the system floor part is not shown;
FIG. 2 is a schematic structural view of the water stop assembly;
FIG. 3 is a cross-sectional view taken along the plane A-A in FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic structural view of a lower water stop assembly;
FIG. 6 is a schematic view of the ground portion of the present invention;
the symbols in the figures are respectively represented as: 1. a piezometric tube; 2. a drill stem; 3. a circuit line; 4. a drill pipe interface or drill pipe catcher; 5. an inner sleeve; 6. a water pump; 7. a variable diameter interface; 8. a rubber ball water stop plug; 9. a movable hollow tube; 9a, a movable outer pipe, 9b, a movable inner pipe, 9c, an inner pipe anti-slip ring, 9d, an outer pipe anti-slip ring, 10, a water inlet pipe; 11. a reducer head interface; 12. a tray; 13. a water return pipe; 14. a pressurizing device; 15. a return water control valve; 16. a water outlet control valve; 17. a water outlet pipe; 18. a water meter; 19. an outer sleeve; 20. a voltage regulator; 21. a power source.
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, wherein area A is relative to the water barrier and area B represents the test layer (aquifer), wherein the system floor part is not shown; FIG. 2 is a schematic structural view of the water stop assembly; FIG. 3 is a cross-sectional view taken along the plane A-A in FIG. 2; FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2; FIG. 5 is a schematic structural view of a lower water stop assembly; fig. 6 is a schematic view of the structure of the ground portion of the present invention.
The top pressure type separate layer water pumping and injecting test system for the same-diameter drill hole as shown in fig. 1-6 at least comprises a sleeve pipe assembly, an upper water stopping assembly and a lower water stopping assembly which are connected in sequence;
in the pumping and water injection system, the sleeve pipe assembly is used as a first core structure of the system, is used for supporting the whole structure of the system, is connected with an external pressurizing device and is pressurized, and is used as a water injection test part, is positioned at the upper end position of a drilled hole, a water pump 6 for pumping water is arranged in the sleeve pipe assembly, the water pump 6 is connected with a water outlet and return pipeline system, and water pumped by the water pump 6 is discharged through the water outlet and return pipeline system to perform a water pumping test, adjust the water outlet amount or control the water level in the hole to be. Simultaneously, still be provided with pressure-measuring pipe 1 in the thimble assembly, pressure-measuring pipe 1 bottom stretches into thimble assembly inside and opening for carry out water level measurement in to the thimble assembly, pressure-measuring pipe 1 joinable water level measuring equipment carries out water level measurement like universal meter, level sensor etc. and pressure-measuring pipe 1 can be the PVC pipe, also can be the floral tube.
In some embodiments, the water pump 6 is used as a water pumping device, and may be a centrifugal pump, a jet pump, a deep well pump, a submersible pump, a deep well pull rod pump, or the like, and may be selected as needed, and the water pump 6 may be a variable frequency water pump with a variable frequency function, and is used for changing the pumping power and adjusting the pumping amount.
In some embodiments, the water outlet and return pipeline system includes a water outlet pipe 17 communicated with the water pump 6, the water outlet pipe 17 is provided with a water outlet control valve 16 and a water meter 18, the water outlet pipe 17 is further communicated with a water return pipe 13, the water return pipe 13 is provided with a water return control valve 15, and a port of the water return pipe 13 extends into the interior of the sleeve assembly. The water pumped by the water pump 6 is discharged through the water outlet pipe 17 to perform a water pumping test, the water outlet control valve 16 and the water meter 18 can control and detect the water quantity, and the water return control valve 15 can control the water return quantity.
Specifically, the sleeve assembly comprises an inner sleeve 5 and an outer sleeve 19 sleeved outside the inner sleeve 5, the outer sleeve 19 is fixed in the hole wall of the drilled hole, and the water pump 6 and the pressure measuring pipe 1 are both arranged in the inner sleeve 5. Because the bore diameter of the drilled hole is generally not less than 133mm (generally 133mm or 150mm), the pipe diameter of the inner sleeve 5 is slightly smaller than the bore diameter of the drilled hole for the convenience of installing the water pump 6, and the pipe diameter of the inner sleeve 5 is not less than 127 mm; specifically, the diameter of the inner sleeve 5 is 5-20mm smaller than the bore diameter of the drill hole; the diameter of the outer sleeve 19 is larger than the inner sleeve 51-2 grade and larger than the bore diameter of the drill hole, and the size of the outer sleeve 19 is 168 mm. The lower extreme of interior sleeve pipe 5 can set up reducing interface 7, goes up water stop assembly upper portion and can set up the socket that matches with the reducing interface, and interior sleeve pipe 5 and last water stop assembly realize the intercommunication through reducing interface 7 and socket phase-match, form the passageway that draws water, keep apart each other between interior sleeve pipe 5 and the outer tube 19, and the region that the diameter difference formed between the two can regard as the water level observation region, and the accessible is surveyd the water level change between the interior outer sleeve pipe of water level observation in the piezometric tube 1. The structural design of interior sleeve pipe 5 and outer tube 19, its main effect is that can measure the water head difference between the interior outer tube of measured internal and external sleeve pipe and in interior sleeve pipe 5 after the stagnant water in order to inspect the stagnant water effect, and concrete operation can be: and after the water stopping is finished, performing water stopping inspection by adopting a water level difference method, namely injecting water into the inner sleeve 5 to an orifice, keeping the water level for about 20-40min, and observing whether the water level between the outer sleeve 19 and the inner sleeve 5 rises or not, if the water level does not change, stopping water completely, and stopping water successfully, and if the water level rises, indicating that the water stopping is invalid or poor in effect, and stopping water unsuccessfully. The inner casing 5 and the outer casing 19 may be made of metal material such as cast iron, and may be a casing for drilling. In some embodiments, the port of the return pipe 13 extends into the interior of the inner sleeve 5.
In some embodiments, a drill pipe 2 is also connected between the water pump 6 and the return pipe system. When the drilling depth is deep, and interior sleeve pipe 5 length is longer, in order to guarantee water pump 6 and return water pipe-line system's effective connection to guarantee that return water pipe-line system can be in ground position, can be connected drilling rod 2 between water pump 6 and return water pipe-line system with the pipeline length between extension return water pipe-line system and the water pump 6. Specifically, the drill rod 2 is connected between the water pump 6 and a water outlet pipe 17 of the water return pipeline system. In some embodiments, a drill rod interface or drill rod connector 4 may be disposed at a pipe orifice position at the connection position of the water pump 6 and the water outlet pipe 17, and the drill rod 2 is communicated with the water pump 6 and the water outlet pipe 17 through the drill rod interface or drill rod connector 4.
In some embodiments, water pump 6 is further coupled to a regulator 20 via circuit line 3, and regulator 20 is coupled to a power source 21. The power supply 21 supplies electric energy for the water pump, and can be a storage battery, a generator and the like; the regulator 3 is used to stabilize the current output from the power supply 21. In some embodiments, the water pump 6 may be a variable frequency water pump, so that the amount of pumped water may be adjusted. In some embodiments, when water pump 6 is the frequency conversion water pump, water pump 6 still is connected with frequency conversion water pump control cabinet through circuit line 3, and frequency conversion water pump control cabinet then is connected with stabiliser 20 electricity to can realize the intelligent regulation of the volume of drawing water through the fine regulation frequency conversion water pump frequency of frequency conversion water pump control cabinet.
In the pumping and injection water system, the upper water stopping component and the lower water stopping component are used as two core structures of system water stopping and are respectively used for water stopping at the upper part and water stopping at the lower part of a test section, the upper water stopping component and the lower water stopping component respectively comprise a telescopic water inlet pipe, the telescopic water inlet pipe is a water pipe with a telescopic structure, such as a telescopic drill rod, a movable hollow pipe and the like, the outer wall of the telescopic water inlet pipe can be connected with at least one rubber ball water stopping plug 8 in a fixing, bonding, riveting, buckling, sleeving and other modes, the rubber ball water stopping plug 8 is of a deformable structure, preferably made of reinforced rubber to meet the requirements of smoothness, wear resistance, elasticity, strength, corrosion resistance and the like, the reinforced rubber can be made of (1000, 1100) denier polyester fiber fabrics, polyvinyl chloride (PVC), Polyethylene (PE) and other materials, and when the materials are not polyvinyl chloride (PVC), a polyvinyl chloride (PE) protective layer can be, when the telescopic water inlet pipe is shortened, the rubber ball water stop plug 8 is extruded and expanded under force and directly slightly larger than the aperture after expansion, so that the aperture of the position of the rubber ball water stop plug 8 can be closed, and the apertures of the upper end and the lower end of the rubber ball water stop plug 8 are closed; specifically, the diameter of the rubber ball water stop plug 8 in the original state is 5-25mm smaller than the hole diameter of the drill hole. Go up the flexible inlet tube upper end of stagnant water subassembly and the thimble assembly promptly also in some embodiments interior sleeve pipe 5 subassembly intercommunication, go up the flexible inlet tube of stagnant water subassembly and communicate each other promptly with water pump 6 and form inhalant canal, go up the flexible inlet tube interconnect of stagnant water subassembly and lower stagnant water subassembly through flexible inlet tube each other, constitute the stagnant water structure that is located the upper and lower position of test section. In some embodiments, 5-8 rubber ball water stop plugs 8 are provided, and can be selected appropriately according to the development degree of the crack of the top and bottom plates of the test section. Specifically, 6 rubber ball water stop plugs 8 are arranged. In some embodiments, the total length of the rubber ball water stop plug is 5-10 times of the hole diameter of the drill hole, so that reliable water stop is guaranteed. Specifically, the total length of the rubber ball water stop plug is 8 times of the bore diameter of the drill hole.
Specifically, the telescopic water inlet pipe of the upper water stopping assembly (the lower water stopping assembly) comprises a telescopic movable hollow pipe 9 and a water inlet pipe 10 communicated with one end of the movable hollow pipe 9. The movable hollow tube 9 is a hollow tube with a telescopic structure, and comprises a movable outer tube 9a and a movable inner tube 9b, one end of the movable inner tube 9b extends into the movable outer tube 9a by a certain length, and the movable inner tube 9b can translate in the movable outer tube 9a along the extending end, so that the overall length of the movable outer tube 9a and the movable inner tube 9b is changed, and the telescopic structure of coaxial sleeve connection is realized. Specifically, the one end outside that activity inner tube 9b stretched into activity outer tube 9a is provided with round inner tube anticreep ring 9C, and activity outer tube 9a is used for stretching into the one end inboard of activity inner tube 9b and is provided with outer tube anticreep ring 9d, and when activity outer tube 9a and the relative translation of activity inner tube 9b, inner tube anticreep ring 9C and outer tube anticreep ring 9d are spacing each other to guarantee that activity outer tube 9a and activity inner tube 9b do not deviate from, realize safe flexible. The water inlet pipe 10 is communicated with the movable hollow pipe 9, namely the lower end of the movable inner pipe 9b, and is mainly used for a water inlet pipeline, so that underground water in a test section can enter the movable hollow pipe 9 from the water inlet pipe 10 and enter the sleeve pipe assembly where the water pump 6 is located. On the basis of the structure of the movable hollow pipe 9, the rubber ball water stop plug 8 is arranged at the telescopic part of the movable hollow pipe 9, namely the sleeve joint part of the movable outer pipe 9a and the movable inner pipe 9b in some embodiments, so that when the movable hollow pipe 9 is telescopic, the rubber ball water stop plug 8 can be instantly contracted and expanded, the response time of the rubber ball water stop plug 8 is shortened, and the purpose of quickly stopping water is achieved. On the basis of the structure of the movable hollow pipe 9, the water inlet pipes 10 of the upper water stop assembly and the lower water stop assembly are communicated with each other, so that the water inlet amount of the whole system can be increased, and the movable hollow pipe 9 of the upper water stop assembly, namely the movable outer pipe 9a, is communicated with the water pump 6, namely the inner sleeve 5 in some embodiments. In some embodiments, the length of the movable hollow tube 9 should be slightly longer than the total length of the rubber ball water stop plug 8 (i.e. the total depth of the rubber ball water stop plug 8 in the drilled hole), and the length of the movable hollow tube 8 is generally at least greater than 1m, so that the rubber ball water stop plug 8 can be rapidly extruded to expand when the movable hollow tube 9 is extended and contracted, and the water stop response time of the rubber ball water stop plug 8 is reduced.
In some embodiments, the inlet pipe 10 may be a floral tube or a retaining wall floral tube to provide water inflow and protection to the pore wall.
In some embodiments, the drill rod 2 is also connected between the water inlet pipe 10 of the upper water stop assembly and the lower water stop assembly, and/or the other end of the movable hollow pipe 9 of the lower water stop assembly, which is the lower end in fig. 1, is communicated with the water inlet pipe 10. Go up drilling rod 2 between inlet tube 10 of water stopping subassembly and lower water stopping subassembly and be used for increasing the interval of going up water stopping subassembly and lower water stopping subassembly, guarantee that the test section can be located completely and form the isolation between going up water stopping subassembly and the lower water stopping subassembly, go up the one end that water stopping subassembly and lower water stopping subassembly are connected drilling rod 2 and all can set up reducing head interface 11 and be used for being connected with drilling rod 2. The drill rod 2 connected with the other end of the movable hollow pipe 9 of the lower water stop assembly communicated with the water inlet pipe 10 is used for stabilizing and supporting the whole system, and the lower end of the lower water stop assembly is used for supporting and forming a support at the bottom of a drilling hole. And if necessary, the lower end of the drill rod 2 connected with the movable hollow pipe 9 of the lower water-stop component should be sealed, so that the drill rod 2 is prevented from being communicated with test layers (aquifers) at the upper end and the lower end of the lower water-stop component. In some embodiments, the drill pipe 2 connected with the movable hollow pipe 9 of the lower water stop assembly can be replaced by a sealed pipe or a solid pipe. In some embodiments, the drill rod 2 connected between the water inlet pipe 10 of the upper water stopping assembly and the lower water stopping assembly and/or the other end of the movable hollow pipe 9 of the lower water stopping assembly communicated with the water inlet pipe 10, and the drill rod 2 connected between the water pump 6 and the water return pipeline system can be used by adopting drill rods with the same structure. In some embodiments, when the test section is a loose layer, the drill pipe 2 between the water inlet pipes 9 of the upper water stop assembly and the lower water stop assembly can be replaced by a dado tube to dado the loose layer.
In some embodiments, the other end of the movable hollow tube 9 of the lower water stop assembly, which is communicated with the water inlet pipe 10, namely the lower end in fig. 1, is also connected with a tray 12. Tray 12 is disc-shaped structure, can adopt stainless steel, alloy steel metal material to make, and the lower part weight of stagnant water subassembly under the mainly used increases guarantees the holistic stability in hole back under the system, and tray 12 supports it (during the extrusion) as the support piece of the rubber ball stagnant water stopper 8 of stagnant water subassembly down simultaneously. In some embodiments, the lower end of the tray 12 may also be provided with a reducer union 11 for connection with the lower drill pipe 2.
In some embodiments, a clamping plate is also clamped outside the position of the orifice at the upper end of the inner jacket tube 5, and the upper end of the clamping plate is provided with a pressurizing device 14. The pressurizing device 14 can press the inner sleeve 5 downwards by propping against the clamping plate, and the inner sleeve 5 presses the telescopic water inlet pipe, namely the movable hollow pipe 9 in some embodiments to be telescopic, so as to press the rubber ball water stop plug 8 to expand for water stop, thereby realizing a top pressure type water stop mode. In some embodiments, the pressurization device 14 may be a drilling rig.
When the system is used, the lower water stopping assembly, the upper water stopping assembly and the sleeve assembly are sequentially subjected to downhole connection according to the content, after downhole connection, a water-containing layer between the lower water stopping assembly and the upper water stopping assembly is a test section, namely a region B in the figure 1, the lower water stopping assembly is positioned in a relative water-resisting layer at the lower end of the test section, namely a region C in the figure 1, and the upper water stopping assembly is positioned in a relative water-resisting layer at the upper end of the test section, namely a region A in the figure 1. The thimble assembly is located the upper end drill way position that is located the water stopping assembly, extrudes flexible inlet tube through outside compression equipment, and then with rubber ball sealing plug extrusion expansion, lower water stopping assembly and the relative water barrier that the water stopping assembly is about to both ends about the test section separate, and then can take out the water injection test. When the water is pumped in the water pumping test, the water pump is started, the underground water in the test section is adsorbed to the water outlet and return system through the inner sleeve of the upper water stop assembly and the sleeve assembly and is discharged out, and during water injection, water is directly injected into or returns to the inner sleeve.
Based on the technical characteristics, the system is simple in overall structure and few in accessories, 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, a layering test can be performed according to a stratum to be tested after one-time pore forming, the position of a top bottom plate of a test section is accurately controlled, repeated work of repeated hole washing, installation and the like of multiple subsection tests is saved, the use process is simplified, the working hours are reduced, water stopping is performed by adopting a mechanical jacking type rubber ball swelling water stopping mode, the water stopping effect is good, the reliability is high, the water stopping response time is short, instant water stopping can be achieved, and the technical defect that a traditional water stopping material needs to be swelled within a certain time can be effectively solved; when the water pumping test device is used, if the water quantity is too small, the water pumping test can be directly changed into a water injection test, equipment does not need to be installed again, and the water pumping test device is simple and convenient; the invention can also be applied to a loose layer layered water pumping or water injection test, the loose layer confined water pumping or water injection test can be carried out only by replacing the drill rod between the upper water stopping assembly and the lower water stopping assembly with the perforated pipe, and the applicability is wide.
In order to better implement and use the system, the invention also provides a brand-new top pressure type layered water pumping and injecting test method for the same-diameter drill hole based on the top pressure type layered water pumping and injecting test system for the same-diameter drill hole, and the method comprises the following steps:
1) forming holes
Drilling and forming by using drilling equipment, wherein the aperture of a drill hole is one to two stages larger than that of the test section, and then an outer sleeve is put in to ensure that the test section is reduced and all drill holes are finished or the drill holes are finished by stages; in this step, the hole diameter of the test section is generally larger than 133mm, so that the upper water stopping assembly and the lower water stopping assembly can be used for freely drilling holes, and the diameter of the drilled hole is generally standard, such as 150mm or 172 mm.
2) Hole washing
After drilling, washing the hole, washing the slurry in the hole, and ensuring the hole wall to be smooth and straight; the hole can be washed by adopting a long drilling tool, and the unsmooth or unsmooth hole wall is leveled, so that the smoothness of the hole wall is ensured, the hole wall is not inclined more than enough, and the smoothness of the hole discharging of the equipment is ensured.
3) Lower water stopping equipment
Measuring the depth position of the test section, determining the length of the drill rod, sequentially drilling according to the sequence of the drill rod, the lower water stopping assembly, the drill rod, the upper water stopping assembly and the inner sleeve, blocking the port at the bottom of the drill rod at the lower end of the lower water stopping assembly, and sealing the connection position of the drill rod, the lower water stopping assembly, the drill rod, the upper water stopping assembly and the inner sleeve. In the step, the drill rods at the lower end of the lower water stopping assembly, between the lower water stopping assembly and the upper water stopping assembly can be selectively used according to the hole depth and the test section depth, the drill rods can be not added in part of drilled holes, the joints of the assemblies are sealed, and if raw adhesive tapes, water stopping adhesives and the like are used for sealing, the joints are guaranteed to be watertight.
4) Water stop
The pressurizing device is utilized to support the clamping plate sleeved on the inner sleeve opening and press down, the movable hollow tube is compressed, contracted and shortened, the rubber ball water stopping piece is extruded to deform and expand, the drilling hole is plugged to realize layered water stopping, and the water stopping inspection is carried out by adopting a water level difference method after the water stopping is finished. . In the step, water is injected into the inner sleeve to the hole opening in the water stopping check, the water level is kept for about 20-40min, and then whether the water level between the outer sleeve and the inner sleeve rises or not is observed, if the water level does not rise, the water stopping effect is good. It should be noted that, if the depth of the inner sleeve is large, the lower water stopping assembly and the upper water stopping assembly may extrude the rubber ball water stopping piece to expand and stop water under the self-weight pressure of the inner sleeve, and the water stopping effect needs to be checked and determined.
5) Water injection test
After the water stopping is finished, if needed, a water reducing head or constant head water injection test can be directly carried out in the inner casing;
6) mounting of corollary equipment
During a water pumping test, the water pump is connected by a drill rod and then is put into the inner sleeve, the piezometric tube is fixed on the drill rod and is synchronously put into the bottom of the inner sleeve, and a circuit line of the water pump is connected with a power supply device;
7) water pumping test
Starting a water pump to pump water to perform a test section water pumping test, and performing water level recovery observation after the water pumping test is completed; in the step, the water outlet control valve and the water return control valve can be adopted to repeatedly adjust and control the water outlet quantity of the water pump so as to achieve the purpose of controlling the water level to be reduced, and the water level can be measured by a universal meter, a water level sensor and the like arranged in the pressure measuring pipe.
8) Test of water injection by layer
And after the water pumping test of the test section is finished, repeating the steps 3) to 7), and performing the water pumping and injecting test on the next test section, so that the water pumping and injecting test of the test sections with different depth section positions can be finished. Namely, after the test of the section is finished, the equipment is lifted, and then the position of the next section of test section is determined again according to the steps 3) to 7), the length of the drill rod to be lowered is determined, and the hole is lowered after the drill rod is installed again.
In the step 3), when the test section is a loose layer, a drill rod between the lower water stopping assembly and the upper water stopping assembly can be replaced by a wall protecting perforated pipe. The wall protecting perforated pipe can protect the wall of the loose layer drilled hole, and can ensure the stability of the test section.
In the using process of the method, when the layered water pumping or water injection test is carried out, the drilling can be stopped after the drilling is carried out to a certain test layer position, the water pumping and water injection test can be started, only the upper water stopping component needs to be reserved at the moment, the lower water stopping component can be directly cancelled, and if necessary, after the lower water stopping component is cancelled, the drill rod can be directly used to be connected with the upper water stopping component for replacement.
The method can perform multiple layering tests according to actual needs after the holes are formed at one time, can save repeated work such as repeated hole washing and loading of multiple segmentation tests, simplifies operation flow, saves construction period and has high operability.
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. The jacking type layered water pumping and injecting test system for the same-diameter drill hole is characterized by comprising a sleeve pipe assembly, an upper water stopping assembly and a lower water stopping assembly which are sequentially connected, wherein a water pump and a pressure measuring pipe are arranged in the sleeve pipe assembly, and the water pump is connected with a water outlet and return pipeline system;
wherein the content of the first and second substances,
go up water stopping subassembly and lower stagnant water subassembly and all include flexible inlet tube, flexible inlet tube outer wall is provided with at least one rubber ball sealing plug, and rubber ball sealing plug can contract or extrusion expansion along with the flexible of flexible inlet tube, go up water stopping subassembly and lower stagnant water subassembly's flexible inlet tube intercommunication each other, go up water stopping subassembly's flexible inlet tube with water pump intercommunication in the thimble assembly.
2. A top pressure type layered water pumping and injecting test system for a borehole with the same diameter as the claim 1, wherein the telescopic water inlet pipe comprises a telescopic movable hollow pipe and a water inlet pipe communicated with one end of the movable hollow pipe, the rubber ball water stop plug is arranged at the telescopic part of the movable hollow pipe, the water inlet pipes of the upper water stop assembly and the lower water stop assembly are communicated with each other, and the other end of the movable hollow pipe of the upper water stop assembly is communicated with a water pump in the sleeve assembly.
3. The top pressure type layered water pumping and injecting test system for the same-diameter drilled hole according to claim 2, wherein the length of the movable hollow tube is greater than 1m, and the length of the rubber ball water stop plug is greater than the contracted length of the movable hollow tube and less than the stretched length of the movable hollow tube.
4. A top pressure type layered water pumping and injecting test system for a co-diameter drill hole according to claim 2, wherein the sleeve assembly comprises an inner sleeve communicated with the movable hollow tube of the top water stopping assembly and an outer sleeve sleeved outside the inner sleeve, the outer sleeve is fixed in the hole wall of the drill hole, and the water pump and the pressure measuring tube are both arranged in the inner sleeve.
5. A top pressure type layered water pumping and injecting test system for a co-diameter drilled hole according to claim 4, characterized in that a drill rod is further connected between the water pump and the water return pipeline system, and/or between the upper water stopping assembly and the water inlet pipe of the lower water stopping assembly, and/or at the other end of the movable hollow pipe of the lower water stopping assembly, and the bottom of the drill rod connected with the other end of the movable hollow pipe of the lower water stopping assembly is sealed.
6. The top pressure type layered water pumping and injecting test system for the same-diameter drilled holes as claimed in claim 4, wherein the water outlet and return pipeline system comprises a water outlet pipe communicated with the water pump, a water outlet control valve and a water meter are arranged on the water outlet pipe, the water outlet pipe is further communicated with a water return pipe, a water return control valve is arranged on the water return pipe, and a port of the water return pipe extends into the inner sleeve.
7. The top pressure type layered water pumping and injecting test system for the same-diameter drilled holes according to claim 1, wherein the total length of the rubber ball water stop plug is 5-10 times of the diameter of the drilled hole.
8. A top pressure type layered water pumping and injecting test method for a same-diameter drill hole is characterized by comprising the following steps:
1) forming holes
Drilling and forming by using drilling equipment, wherein the aperture of a drilling hole is one to two times larger than that of the test section, and an outer sleeve is put in to ensure that the diameter of the test section is changed to completely complete the drilling or complete the drilling stage by stage, and the aperture of the test section is not less than 133 mm;
2) hole washing
After drilling, washing the hole, washing the slurry in the hole, and ensuring the hole wall to be smooth and straight;
3) lower water stopping equipment
Measuring the depth position of the test section, determining the length of the drill rod, sequentially drilling according to the sequence of the drill rod, the lower water stopping assembly, the drill rod, the upper water stopping assembly and the inner sleeve, blocking a port at the bottom of the drill rod at the lower end of the lower water stopping assembly, and sealing the connection position of the drill rod, the lower water stopping assembly, the drill rod, the upper water stopping assembly and the inner sleeve;
4) water stop
Pressing the clamping plate sleeved on the opening of the inner sleeve by using a pressurizing device and pressing down, wherein the movable hollow tube is compressed, contracted and shortened, and extrudes the rubber ball water stop piece to deform and expand, so that the drill hole is plugged to realize layered water stop, and after the water stop is finished, a water stop inspection is carried out by adopting a water level difference method;
5) water injection test
After the water stopping is finished, if needed, a water reducing head or constant head water injection test can be directly carried out in the inner casing;
6) mounting of corollary equipment
During a water pumping test, the water pump is connected by a drill rod and then is put into the inner sleeve, the piezometric tube is fixed on the drill rod and is synchronously put into the bottom of the inner sleeve, and a circuit line of the water pump is connected with a power supply device;
7) water pumping test
Starting a water pump to pump water, performing trial pumping and formal pumping of a test section pumping test, and performing water level recovery observation after the pumping test is finished;
8) test of water injection by layer
And after the water pumping test of the test section is finished, repeating the steps 3) to 7), and performing the water pumping and injecting test on the next test section, so that the water pumping and injecting test of the test sections with different depth section positions can be finished.
9. The method as claimed in claim 8, wherein in the step 3), when the test section is a loose layer, the drill pipe between the lower water stop assembly and the upper water stop assembly is replaced by a wall protection perforated pipe.
10. The method as claimed in claim 8, wherein in the step 7), the water outlet control valve and the water return control valve are adopted to repeatedly adjust and control the water outlet quantity of the water pump during the water pumping process so as to control the water level to be reduced, and the water level is measured in the pressure measuring pipe.
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| CN111722300A (en) * | 2020-06-30 | 2020-09-29 | 黄河勘测规划设计研究院有限公司 | Layered instantaneous water pumping type micro-water test method in drill hole |
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| CN111947988A (en) * | 2020-08-24 | 2020-11-17 | 中国地质调查局西安地质调查中心(西北地质科技创新中心) | Device for layered pumping and sampling of underground water and test method thereof |
| CN111947988B (en) * | 2020-08-24 | 2023-04-07 | 中国地质调查局西安地质调查中心(西北地质科技创新中心) | Device for layered pumping and sampling of underground water and test method thereof |
| CN112554782A (en) * | 2020-12-11 | 2021-03-26 | 徐州中矿地科岩土工程技术有限公司 | Method for water pumping, pressure measuring and water pumping borehole segmented isolation |
| CN112554782B (en) * | 2020-12-11 | 2024-01-30 | 徐州中矿地科岩土工程技术有限公司 | Method for carrying out sectional isolation of water pressing, pressure measuring and water pumping drilling |
| CN113514383A (en) * | 2021-06-18 | 2021-10-19 | 西安科技大学 | Device and method for testing heights of two belts of top plate |
| CN113514383B (en) * | 2021-06-18 | 2023-09-19 | 西安科技大学 | Device and method for testing heights of two belts of top plate |
| CN114837603A (en) * | 2022-05-25 | 2022-08-02 | 江苏省工程勘测研究院有限责任公司 | Borehole water-pressurizing test plug and system |
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