CN110777798B - Method and equipment for filling dynamic water rotational flow in underground water monitoring well - Google Patents

Abstract

The invention provides a method for filling the flowing water of underground water monitoring well by rotational flow and a filling device, the method uses a water pump to pump water in a well pipe to make the well hole present a negative pressure state, uses a water pump to pump slurry from a water tank on the ground and inject the slurry into a feeding funnel to form rotational flow, then puts the gravel material or clay ball into the rotational flow, the rotational flow makes the gravel material or clay ball in a motion state to prevent the gravel material or clay ball from depositing in the funnel when the gravel material or clay ball is static and causing the blockage of the funnel, when the rotational flow enters a conduit, the water flow in the conduit is also in a rotation state, the rotation state can drive the gravel material or clay ball to be in a rotation state, the rotation state enhances the sinking power of the gravel material or clay ball to prevent the gravel material or clay ball from piling up in the gap between the well wall and the well pipe to further block the gap, and simultaneously the gravel material or clay ball can be uniformly filled in a ring hole, the well quality is ensured.

Description

Method and equipment for filling dynamic water rotational flow in underground water monitoring well

Technical Field

The invention relates to the technical field of filling of underground water monitoring wells, in particular to a method and equipment for filling a flowing water rotational flow of an underground water monitoring well.

Background

As a high-quality water source, underground water is an important water supply source in China. In 2018, the water supply of underground water in China exceeds 970 hundred million m³Wherein the groundwater supply in northeast and northChina accounts for more than 50% of the total water supply. Groundwater has become an important determinant of economic development in a region and therefore monitoring of groundwater is essential. The most effective measure for monitoring underground water is to construct a special underground water monitoring well. At present, more than 2 ten thousand national-level underground water monitoring wells are built in China, and the average monitoring density is only 1/500 km²And the density of the monitoring well is far from meeting the monitoring requirement. In order to meet the initial requirement of 1 monitoring well per hundred square kilometers, at least 8 thousands of monitoring wells are required to be built, and in some local key areas, the monitoring density needs to be higher. In the process of monitoring well construction, in order to prevent fine sand of a water-bearing stratum from entering a well, gravel materials are required to be filled between the water filter pipes and the wall of the hole; in order to ensure relative independence between different aquifers, special clay balls are filled in the positions of the water-resisting layers to stop water.

The conventional method adopts a still water filling method, and after a well completion pipe is lowered, gravel materials and clay balls are directly filled into a well mouth, so that the gravel materials and the clay balls are freely precipitated into the well. Because the gap between the hole wall and the well pipe is small, the buoyancy of mud in the well is large, and the sedimentation rate and the movement direction of gravel materials and clay balls are basically not controlled. Once the fill rate of the gravel and clay balls is greater than the settling rate, the gravel and clay balls are jammed somewhere, causing the filled gravel and clay balls to fail to reach the designated location. Moreover, once the gravel material and the clay balls are filled into the well, the gravel material and the clay balls cannot be taken out for refilling even if the gravel material and the clay balls do not reach the specified position, and finally the monitoring well can only be scrapped, thereby causing great economic loss.

Disclosure of Invention

The invention aims to provide a method and a filling device for filling gravel materials and clay balls in a ring hole between a well pipe and a hole wall of a monitoring well, which ensure that the gravel materials and the clay balls can be accurately filled to a specified position.

The invention firstly provides a method for filling the flowing water rotational flow of an underground water monitoring well, which comprises the following specific steps:

step 1, determining the positions and thicknesses of an aquifer and a water-resisting layer according to drilling and logging parameters;

step 2, obtaining the gravel material consumption according to the outer diameter of the water filtering pipe, the bore diameter of the drill hole and the thickness of the aquifer; obtaining the clay ball consumption according to the outer diameter of the retaining wall pipe, the bore diameter of the drill hole and the thickness of the waterproof layer;

step 3, injecting the slurry into the shaft from the slurry pool by using a water pump, and then returning the slurry to the slurry pool from the shaft by using a water pump, wherein the water pumping amount of the water pump is equal to the water pumping amount of the water pump, the slurry pumped by the water pump enters the slurry pool after being filtered and precipitated, the slurry is circulated between the shaft and the slurry pool, and meanwhile, water is added into the slurry pool, and after multiple cycles, the viscosity of the slurry is adjusted to the level that the stability of the local wall of the well can be ensured and the subsidence of gravel or clay balls can be ensured to the maximum extent;

step 4, a conduit for feeding is put into a specified position in an annular hole between a well pipe in a monitoring well hole and the monitoring well hole, and then the feeding funnel is installed at the upper end of the conduit;

step 5, feeding the slurry into the feeding funnel by using the water feeding pump to form rotational flow in the feeding funnel;

step 6, judging whether the bottom of the monitoring well is a water-bearing layer or a water-resisting layer, if the bottom of the well pipe is the water-bearing layer, filling gravel materials, and if not, filling clay balls;

and 7, feeding the slurry into the feeding hopper and simultaneously feeding the gravel material or the clay balls according to the conclusion judged in the step 6, wherein the method specifically comprises the following steps:

step 71, adding the gravel or clay balls into the conduit along with the rotational flow;

step 72, controlling the water pumping amount of the water pump to enable the water pumping amount of the water pump to be equal to the water delivery amount of the water delivery pipe;

73, controlling the conduit to do uniform reciprocating circular motion around the well pipe, and when the conduit moves to the water pumping pipe, then moving in the reverse direction, and when the conduit reaches the water pumping pipe again, then moving in the reverse direction;

step 74, measuring the height of the charge level by using the filler top surface depth measuring instrument in the filling process, confirming that the charge level reaches the set height, lifting the guide pipe, and then refilling;

step 75, if the material level height reaches the height of the top of the current water-resisting layer or the aquifer, replacing the type of the filler; and

and 8, repeating the step 7 until the filling process is finished after the filling is carried out to the wellhead of the monitoring well.

Preferably, the viscosity of the slurry in the step 3 is 17 seconds.

Preferably, the filling rate in the step 71 is 2-4m 3/h.

Preferably, in the step 71, the viscosity of the slurry is continuously observed during the filling of the clay balls, when the viscosity of the slurry is greater than or equal to 20 seconds, water is mixed with the slurry to reduce the viscosity of the slurry, and when the viscosity of the slurry reaches 17 seconds, the water supply can be stopped to continue supplying the slurry.

Preferably, in the step 5, the water delivery amount in unit time is adjusted, and the distance from the connecting line of the liquid level edges of the whirling liquid to the bottom of the funnel is 2/3 of the distance from the liquid level edge to the bottom of the funnel.

Secondly, the invention provides a filling device using a method for monitoring well flowing water rotational flow filling by using underground water, which comprises a monitoring well hole, a water feeding pump, a liquid supply pool, a water feeding pipe, a feeding funnel, a feeding conduit, a well pipe, a valve, a wall protecting pipe, a water suction pump, a water suction pipe and a filling top surface measuring instrument;

the caliber of the well pipe is smaller than that of the monitoring well hole, the well pipe is placed in the monitoring well hole and comprises a water filter pipe and a wall protection pipe, and the well pipe is connected with the well pipe through a screw thread;

the liquid supply pool comprises a water supply pump chamber, a mud pool and a clean water pool; the water feeding pump chamber is communicated with the mud pit and the clean water pit through valves, and the valves place mud in the mud pit or clean water in the clean water pit into the pump chamber;

the feeding guide pipe comprises a plurality of sections of guide pipes, the guide pipes are connected with each other through screw threads, and the feeding guide pipe is arranged in a gap between the well hole of the monitoring well and the well pipe and is used for filling gravel or clay balls between the well hole and the well hole;

the feeding funnel is arranged at the upper end of the guide pipe, a water feeding port is formed in the side wall of the feeding funnel, and the water feeding port is connected with the water feeding pipe;

the other end of the water delivery pipe is connected with the water delivery pump, and the water delivery pump pumps the slurry in the water delivery pump chamber into a feeding funnel through the water delivery pipe;

the water suction pump is connected with the water suction pipe and is arranged in the monitoring well hole, and the water suction pump is used for pumping the slurry in the monitoring well hole to the slurry pool;

the filler top surface measuring instrument is used for measuring the height of the filler top surface.

Preferably, the filler top surface measuring instrument comprises a bracket, a handle, a spool, a measuring probe, a cable, a buzzer, an indicator light and a battery;

the bobbin is a hollow cylinder and can rotate around a horizontal shaft on the bracket; the handle is fixed on the annular surface on one side of the spool and used for rotating the spool, winding and unwinding the cable and winding the cable on the spool; the battery is arranged on the side surface of the bobbin; the buzzer and the indicating lamp are connected to the cable in series; the cable consists of a positive sub cable and a negative sub cable with scales, wherein the first end of the positive sub cable is connected with the positive pole of the battery, and the first end of the negative sub cable is connected with the negative pole of the battery;

the measuring probe comprises a primary heavy hammer and a secondary heavy hammer; the upper end of the primary heavy hammer is provided with a metal negative terminal and a negative terminal insulating shell sleeved outside the negative terminal, the negative terminal is connected with a first end of a cable negative interface in a welding mode, and a second end of the cable negative interface is connected with a second end of the negative cable penetrating through the negative terminal insulating shell; the secondary heavy hammer is a hollow cylindrical body and is fixed in the middle of the cable, a hollow movable terminal is arranged at the lower end of the secondary heavy hammer and is connected with a negative terminal insulating shell of the primary heavy hammer in a sliding mode through the movable terminal, a cable positive interface and a limiting valve are arranged at the lower end of the movable terminal, and the limiting valve is used for preventing the movable terminal from being separated from the negative terminal insulating shell; the cable penetrates through the secondary heavy hammer and the movable terminal, the second end of a positive sub cable of the cable penetrates through the movable terminal to be connected with a positive cable interface, and the second end of a negative sub cable of the cable penetrates through the negative terminal insulating shell to be connected with the second end of a negative cable interface of the cable;

when the measuring instrument is suspended underground and the measuring probe is not in contact with the charge level, a circuit formed by the measuring probe and the battery is not connected and is in a power-off state, no current passes through the circuit, the buzzer does not sound, and the indicator light is not lightened; when the first-level heavy hammer of the measuring probe contacts the material level, the first-level heavy hammer stops sinking, the second-level heavy hammer sinks under the action of gravity to press the mobile terminal to move downwards, the mobile terminal drives the cable anode interface to move downwards after moving downwards, after the cable anode interface contacts the cathode terminal, the whole circuit forms a loop, current passes through the cable, the buzzer sounds, the indicator light is on, the situation that the probe reaches the material level is judged, and the scale on the cable is read, so that the height of the material level can be obtained.

Preferably, the tangent to the edge of the dosing funnel passing through the delivery nozzle is at an angle of 30 degrees to the edge of the funnel.

Compared with the prior art, the invention has the following beneficial effects:

the invention is different from the former still water filling method, and adopts a dynamic water filling method. The water pump is arranged in the water filtering pipe to pump water, so that the inside of the well hole is in a negative pressure state; the guide pipe guides the gravel material and the clay balls to a specified position; the water pump extracts slurry from a water tank on the ground, and the slurry is injected into the feeding funnel to form a rotational flow, wherein the rotational flow has the function of enabling the gravel or clay balls to be in a moving state, so that the gravel or clay balls are prevented from being deposited in the funnel when being static, and the funnel is prevented from being blocked. When the rotational flow enters the conduit, the water flow in the conduit is also promoted to be in a rotating state, and the rotating state can also drive the gravel material or the clay ball to be in a rotating state, so that the rotating state strengthens the sinking power of the gravel material or the clay ball, prevents the gravel material or the clay ball from being accumulated in a gap between the well wall and the well pipe, further blocks the gap, and simultaneously can ensure that the gravel material or the clay ball is uniformly filled in the annular hole, thereby ensuring the well forming quality. Because the negative pressure field formed by pumping water and the positive pressure field formed by swirling flow are superposed, the movement of the gravel material or clay balls in the annular holes is greatly enhanced, and the filling quality guarantee rate of the gravel material or clay balls is greatly improved.

Drawings

FIG. 1 is a schematic diagram showing a rotational flow packing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of a cyclone packing in an embodiment of the present invention;

FIG. 3 is a schematic diagram of the vortex formation and height control of an embodiment of the present invention; and

FIG. 4 is a schematic view of a top surface height measuring instrument for packing according to an embodiment of the present invention.

In the figure:

1. a water pump; 2. a liquid supply tank; 3. a water supply pipe; 4. a feeding hopper; 5. a water inlet; 6. a feeding conduit; 7. gravel or clay balls; 8. a water filter pipe; 9. protecting the wall pipe; 10. a water pump; 11. slurry; 12. a water pumping pipe; 13. a water barrier layer; 14. an aqueous layer; 15. monitoring the wellbore; 16. a mud pool in the liquid supply pool; 17. a clean water tank in the liquid supply tank; 18. a pump chamber within the liquid supply reservoir; 19. a valve of the slurry tank in the liquid supply tank; 20. a valve of the clean water tank in the liquid supply tank; 21. cutting a line through the edge of the funnel of the water feeding port; 22. the included angle between the tangent line of the edge of the funnel and the water supply pipe; 23. swirling flow in the funnel;

301. forming a rotational flow in the funnel; 302. the edge of the swirling liquid level is connected with a plane formed by lines; 303. a funnel-shaped liquid level is formed in the funnel; 304. the height from a plane formed by the edge connecting line of the swirling liquid level to the bottom of the funnel;

401. a handle; 402. an indicator light; 403. a buzzer; 404. a cable; 405. a measuring probe; 406. a bobbin; 407. a battery; 409. a cable negative interface; 410. a cable positive interface; 411. a movable terminal; 411. a negative terminal; 412. a negative terminal insulating case; 414. a first-level heavy hammer; 415. and (5) a secondary weight.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a rotational flow filling device according to an embodiment of the present invention, which includes a monitoring well 15, a water pump 1, a liquid supply tank 2, a water pipe 3, a feeding funnel 4, a water supply port 5, a feeding conduit 6, a water filter pipe 8, a wall protection pipe 9, a water pump 10, a valve 19 of a slurry tank in the liquid supply tank, a valve 20 of a clean water tank in the liquid supply tank, a filling top surface measuring instrument, and a water pump pipe 12. Before the monitoring well is built, a monitoring well hole 15 needs to be drilled, in order to protect the stability of the monitoring well hole 15, a well pipe is put into the monitoring well hole 15, the well pipe comprises a water filter pipe 8 and a wall protection pipe 9, each well pipe is 10m long, and the well pipe are connected through screw threads. The bore of the well tubular is smaller than the bore of the monitoring borehole 15. In order to ensure the connectivity between the well pipe and the aquifer and isolate the communication between the aquifers at different depths, gravel or clay balls 7 are filled between the well pipe and the borehole, so that a gap is required between the well pipe and the borehole. In order to ensure the accuracy of the filling, a feeding conduit 6 is arranged in the gap, the feeding conduit 6 is formed by connecting a plurality of conduits, each conduit is 2m long, and the conduits are connected with each other by screw threads. The upper end of the feeding conduit 6 is provided with a feeding funnel 4, and the feeding funnel 4 is connected with the feeding conduit 6 in a screw thread mode. In order to create a swirling flow 23 in the hopper, a water delivery opening 5 is provided in the side wall of the feed hopper 4. The water supply pipe 3 is connected with the water supply port 5, and the water supply port 5 is connected with the water supply pipe 3 in a welding mode. The other end of the water supply pipe 3 is connected with the water supply pump 1. The water-feeding pump 1 is connected with the liquid-feeding pool 2 in a screw thread mode, and slurry or clean water in the pump chamber 18 is pumped into the feeding funnel 4 through the water-feeding pump 1. The suction pump 10 and the suction pipe 12 are screwed. The pump 10 draws the treated mud 11 from the monitoring borehole 15. The liquid supply pool 2 is divided into three parts, including a water supply pump chamber 18, a mud pool 16 and a clean water pool 17, mud or clean water can be put into the pump chamber 18 by using a valve 19 of the mud pool in the liquid supply pool and a valve 20 of the clean water pool, and the mud or the clean water is pumped into the feeding funnel 4 by the water supply pump 1. The mud in the mud pit 16 comes from the mud 11 pumped by the water pump 10 from the monitoring borehole 15 and processed.

The diameter of the well pipe in the embodiment is 146mm, and the diameter of the monitoring well is 300 mm. The diameter of the gravel 7 is 2-4mm, and the diameter of the feeding conduit 6 is greater than or equal to 20 times of the diameter of the gravel 7, and is 80mm in the embodiment. The diameter of feeding funnel 4 is 300mm, and the diameter of delivery port 5 is 20mm, and the diameter of delivery pipe 3 is the same with delivery port 5 diameter, also is 20mm, and strainer 8 diameter is 146 mm.

The top of fill gauge includes a bracket, a handle 401, a spool 406, a measurement probe 405, a cable 404, a buzzer 403, an indicator light 402, and a battery 407. The bobbin 406 is a hollow cylinder, and the bobbin 406 has an outer diameter of 300mm and an inner diameter of 200 mm. The cable 404 can be wound on the spool 406 by means of the handle 401, which can be turned around a horizontal axis on the stand. The cable 404 is graduated to the nearest millimeter. The length of the cable 404 may be defined in various sizes such as 100m and 200 m. The cable 404 is composed of a positive sub-cable and a negative sub-cable, wherein the first end of the positive sub-cable is connected with the positive pole of the battery, and the first end of the negative sub-cable is connected with the negative pole of the battery. Battery 407 is a conventional No. 1 alkaline battery mounted on the side of bobbin 406. The measurement probe 405 includes a primary weight 414 and a secondary weight 415. The primary weight 414 and the secondary weight 415 are made of stainless steel with a high density and are cylinders with a diameter of 50 mm. The upper end of the primary weight 414 is provided with a metal negative terminal 412 and a negative terminal insulating shell 413 sleeved outside the negative terminal 412, the negative terminal 412 is connected with a first end of a cable negative interface 409 in a welding mode, and a second end of the cable negative interface 409 is connected with a second end of a cable negative cable penetrating through the negative terminal insulating shell 413; the secondary weight 415 is a hollow cylindrical body and is fixed in the middle of the cable, a hollow moving terminal 411 is arranged at the lower end of the secondary weight 415, the moving terminal 411 is connected with the negative terminal insulation shell 413 of the primary weight 414 in a sliding mode, a cable positive interface 410 and a limiting valve are arranged at the lower end of the moving terminal 411, and the limiting valve is used for preventing the moving terminal 411 from being separated from the negative terminal insulation shell 413; the cable passes through the secondary weight 415 and the mobile terminal 411, the second end of the positive sub-cable of the cable passes through the mobile terminal 411 to be connected with the positive cable interface 410, and the second end of the negative sub-cable of the cable passes through the negative terminal insulating shell 413 to be connected with the second end of the negative cable interface 409; the buzzer 403 and the indicator light 402 are connected in series to the cable. When the measuring instrument is suspended underground and does not contact the material surface, a circuit formed by the measuring probe 405 and the battery is not connected and is in a power-off state, no current passes through the circuit, the buzzer 403 does not sound, and the indicator light 402 is not lightened. When the primary weight 414 of the measuring probe 405 contacts the material level, the primary weight 414 stops sinking, and the secondary weight 415 sinks under the action of gravity, so as to press the moving terminal 411 to move downward. The moving terminal 411 moves downward to drive the cable positive interface 410 to move downward, and when the cable positive interface 410 contacts with the negative terminal 412, the whole circuit forms a loop, and current passes through the cable. At this time, the buzzer 403 will sound, and the indicator lamp 402 will be lighted, so as to judge that the measuring probe has reached the material level. The reading on the cable is read to know the height of the material level.

In this embodiment, the flowing water swirling gravel filling process is as shown in fig. 2, and includes the following specific steps:

step 1, determining the positions and the thicknesses of an aquifer 14 and a water-resisting layer 13 according to drilling and logging parameters. The aquifer 14 is typically a sand layer and the water barrier 13 is typically a clay layer. The aquifer 14 is generally spaced apart from the water barrier 13. The aquifer 14 and the water barrier 13 are related to local geological conditions, and the aquifer 14 and the water barrier 13 are different in each well and need to be determined by sampling results and an electrical logging method during drilling.

And 2, obtaining the using amount of the gravel according to the outer diameter of the water filtering pipe 8, the bore diameter of the drill hole and the thickness of the aquifer 14. And obtaining the clay ball consumption according to the outer diameter of the wall protection pipe 9, the bore diameter and the thickness of the water-resisting layer 13.

If the radius of the well hole is R, the radius of the water filter pipe 8 is R, and the length of the well section of the gravel material 7 to be filled is L, the volume V of the gravel material 7 to be filled is equal to the volume V of the annular hole between the well hole and the water filter pipe 8, namely:

V＝π×(R²-r²)×L (1)

in order to ensure that the gravel 7 is not blockedThe material guide pipe 6 is used for obtaining the required filling amount of the ring hole with 1.5m each time. If the monitor wellbore 15 is 300mm in diameter, the radius is 150 mm. The diameter of the water filter pipe 8 is 146mm, the radius is 73mm, and the length of the gravel throwing segment is 1.5 m. The amount of gravel required for that interval is 0.008m³Therefore, 0.008m needs to be prepared before filling³A gravel material 7.

The clay ball is used in the same manner as the gravel.

And 3, pressurizing by using the water delivery pump 1, injecting the slurry 11 into the shaft from the slurry pool 16, and then returning the slurry to the slurry pool 16 from the shaft, so that the slurry circulates between the shaft and the slurry pool 16, and simultaneously adding water into the slurry pool 16 to gradually reduce the viscosity of the slurry 11. Since the viscosity cannot be reduced at once, and a gradual process is required, multiple cycles are required. And circulating the slurry 11 in the well, and adjusting the viscosity of the slurry to a certain level so as to ensure the stability of the local wall of the well and ensure the subsidence of the gravel material or clay balls 7 to the maximum extent. The mud in the well is an important condition for ensuring the stability of the hole wall. The slurry viscosity is high, so that the buoyancy force applied when the gravel material or clay ball is filled is high, the sinking rate is low, and the filling efficiency is influenced; the low mud viscosity, the monitoring borehole 15 sidewall tends to collapse. According to a large amount of engineering experience statistics, the optimal condition is when the viscosity of the slurry is 17 seconds. The mud viscosity can be measured with a mud viscometer, and the measurement is in seconds.

Step 4, the feeding conduit 6 is lowered to a designated position from the annular hole between the water filter pipe 8 and the monitoring well hole 15, and then the feeding funnel 4 is arranged at the upper end of the feeding conduit 6; the feeding funnel 4 is connected with a water supply pipe 3, and the water supply pipe 3 is connected with the liquid supply pool 2; the liquid supply pool 2 is divided into three parts, wherein one part is a water supply pump chamber 18, the other part is a mud pool 16, the other part is a clean water pool 17, mud or clean water can be put into the pump chamber 18 by utilizing a valve 19 of the mud pool in the liquid supply pool and a valve 20 of the clean water pool, and the mud or the clean water is pumped into the feeding funnel 4 by the water supply pump 1. The mud in the mud pit 16 comes from the mud 11 pumped by the water pump 10 from the monitoring borehole 15 and processed. When the gravel is charged, the viscosity of the slurry 11 is not affected, and the slurry 11 and the gravel 7 are mixed by the charging pipe 6 and introduced into the annular hole. If clay balls are added, hydration occurs after the clay balls are mixed with the slurry 11, namely, the surfaces of the clay balls are dissolved by the slurry 11, so that the viscosity of the slurry is increased. When the viscosity increases to a certain extent, the subsidence of the gravel or clay balls 7 is affected. Therefore, the viscosity of the slurry is continuously observed in the feeding process, and when the viscosity of the slurry is measured to be more than or equal to 20 seconds, a valve of a water tank in the liquid supply tank can be opened to mix water and the slurry, so that the viscosity of the slurry is reduced. When the viscosity of the slurry reaches 17 seconds, the water supply can be stopped and the slurry can be continuously supplied.

A suction pump 10 is installed downhole and the suction pump 10 is lowered into the well pipe to a designated location, and a suction pipe 12 is connected to the mud pit. The water pump 10 is arranged at the position of the water filter pipe 8 for pumping water. The pumping volume of the pump 10 may be controlled by controlling the input current. In the filling process, the water pumping amount of the water pump 10 is equal to the water delivery amount of the water delivery pipe 3 connected with the wellhead feeding funnel 4. The pumped mud enters a mud pool 16 in the liquid supply pool 2 after being filtered and precipitated for recycling.

And 5, opening the water feeding pump 1 to feed the slurry into the feeding funnel 4, and forming rotational flow in the feeding funnel 4. To form a rotational flow in the feeding funnel 4, the water delivery port 5 cannot be perpendicular to the edge of the feeding funnel 4, a funnel edge tangent 21 passing through the water delivery port forms a certain angle with the funnel edge, and the included angle 22 between the funnel edge tangent and the water delivery pipe is generally 30 degrees. In this way, the water flow delivered from the delivery nozzle 5 can form a vortex 23 at the funnel edge. Considering that the rotational flow formed by the water flow in the northern hemisphere in the natural condition is counterclockwise under the action of the turning deviation force, the rotational flow controlled by the invention is also counterclockwise.

When the water supply pipe 3 supplies water to the feeding funnel 4, a rotational flow 301 is formed in the feeding funnel, and as shown in fig. 3, the height 304 from a plane 302 formed by the edge connecting lines of the liquid surface of the rotational flow to the bottom of the funnel is H meters. After a certain number of revolutions of the cyclone, a funnel-shaped liquid level 303 is formed in the funnel. The amount of water fed per unit time was adjusted and the swirl was considered to be optimum when the distance from the bottom of the liquid surface to the bottom of the funnel was 2/3 times the distance from the edge of the liquid surface to the bottom of the funnel. At this time, gravel or clay balls may be put into the hopper.

Step 6, judging whether the bottom of the monitoring well is a water-bearing stratum 14 or a water-resisting stratum 13, if the bottom of the well pipe is the water-bearing stratum, filling gravel materials, and if the bottom of the well pipe is the water-resisting stratum, filling clay balls;

and 7, feeding the gravel or clay balls into the feeding hopper 4 while feeding the slurry 11 into the feeding hopper according to the judgment result in the step 6, and specifically comprising the following steps:

at step 71, the proper packing rate is maintained. The filling rate is an important parameter for ensuring that gravel materials and clay balls can smoothly enter a well, the filling is easily blocked when the filling rate is too high, and the filling efficiency is reduced when the filling rate is too low. In this example, the rate of the filler was controlled to be 2 to 4m³H is used as the reference value. In the process of filling, clay balls are evenly poured into the feeding funnel 4 along the edge of the feeding funnel, so that the clay balls enter the feeding guide pipe 6 along with the rotational flow.

And step 72, turning on the water pump 10 to pump water. When the slurry is fed into the annular hole, because the volume of the slurry 11 is occupied by the volume of the material, a part of the redundant slurry 11 enters the strainer from the annular hole and overflows from the strainer 8 to the wellhead, and the other part of the redundant slurry 11 flows from bottom to top from the annular hole and finally overflows from the wellhead. Due to the high density and viscosity of the mud, the rising speed is greatly influenced by gravity, viscous force and frictional resistance of the well pipe during rising. In order to reduce the rising resistance of the mud and promote the rising tendency of the mud in the well hole, a water pump 10 is lowered into the strainer 8 to pump water. The water pumping amount of the water pump 10 is equal to the amount of the mud 11 sent by the water sending pump 1, so that the mud liquid level in the well hole is kept stable, and the collapse of the well hole due to the fact that the mud liquid level 11 in the well is too low is avoided.

In order to ensure that the gravel or clay balls can be uniformly filled in the annular holes, the feeding conduit 6 performs uniform reciprocating circular motion around the well pipe during the filling process until the filling is finished, step 73. The reason why the reciprocating circular motion is required is that the feeding duct 6 cannot make a complete circular motion because of the blocking of the pumping pipe 12. When the feeding conduit 6 moves to the position of the water pumping pipe 12, the feeding conduit moves reversely, and when the feeding conduit reaches the water pumping pipe again, the feeding conduit moves reversely until the filling is finished.

And step 74, in the gravel filling process, a filler top surface depth measuring instrument shown in the attached figure 4 is put into the guide pipe, the height of the material surface is measured by the depth measuring instrument in stages, after the material surface filling is confirmed to reach the standard, the guide pipe is lifted by 2m, and then the clay ball is filled. The measurement frequency is determined according to the thickness of the water barrier, and is measured every 5m of filling. If the filling reaches the standard, the filling can be continued. If the filling is found to be uneven, the filling effect is corrected by controlling the position of the catheter.

Step 75, if the material level height reaches the height of the top of the current water-resisting layer or the aquifer, replacing the filling type;

and 8, repeating the step 7 until the filling process is finished after the filling is carried out to the wellhead of the monitoring well.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims (7)

1. The method is characterized in that the filling equipment used for the method comprises a monitoring well hole, a water feeding pump, a liquid supply pool, a water feeding pipe, a feeding funnel, a feeding conduit, a well pipe, a valve, a wall protecting pipe, a water pump, a water pumping pipe and a filling top surface measuring instrument; the caliber of the well pipe is smaller than that of the monitoring well hole, the well pipe is placed in the monitoring well hole and comprises a water filter pipe and a wall protection pipe, and the well pipe is connected with the well pipe through a screw thread; the liquid supply pool comprises a water supply pump chamber, a mud pool and a clean water pool; the water feeding pump chamber is communicated with the mud pit and the clean water pit through valves, and the valves place mud in the mud pit or clean water in the clean water pit into the pump chamber; the feeding guide pipe comprises a plurality of sections of guide pipes, the guide pipes are connected with each other through screw threads, and the feeding guide pipe is arranged in a gap between the well hole of the monitoring well and the well pipe and is used for filling gravel or clay balls between the well hole and the well hole; the feeding funnel is mounted at the upper end of the feeding conduit, a water feeding port is formed in the side wall of the feeding funnel, and the water feeding port is connected with the water feeding pipe; one end of the water supply pipe is connected with the water supply pump, and the water supply pump pumps the slurry in the water supply pump chamber into the feeding funnel through the water supply pipe; the water suction pump is connected with the water suction pipe and is arranged in the monitoring well hole, and the water suction pump is used for pumping the slurry in the monitoring well hole to the slurry pool; the filler top surface measuring instrument is used for measuring the height of the top surface of the filler;

the method comprises the following specific steps:

step 1, determining the positions and thicknesses of an aquifer and a water-resisting layer according to drilling and logging parameters;

step 2, obtaining the gravel material consumption according to the outer diameter of the water filtering pipe, the bore diameter of the drill hole and the thickness of the aquifer; obtaining the clay ball consumption according to the outer diameter of the retaining wall pipe, the bore diameter of the drill hole and the thickness of the waterproof layer;

step 3, injecting mud into the well pipe from the mud pit by using a water pump, and then returning the mud to the mud pit from the well pipe by using a water pump, wherein the water pumping amount of the water pump is equal to the water pumping amount of the water pump, the mud pumped by the water pump enters the mud pit after being filtered and precipitated, the mud is circulated between the well pipe and the mud pit, water is added into the mud pit simultaneously, and after multiple cycles, the viscosity of the mud is adjusted to ensure the stability of the local wall of the well and the sinking of gravel or clay balls to the maximum extent;

step 4, a conduit for feeding is put into a specified position in an annular hole between a well pipe in a monitoring well hole and the monitoring well hole, and then the feeding funnel is installed at the upper end of the conduit;

step 5, feeding the slurry into the feeding funnel by using the water feeding pump to form rotational flow in the feeding funnel;

step 6, judging whether the bottom of the monitoring well is a water-bearing layer or a water-resisting layer, if the bottom of the well pipe is the water-bearing layer, filling gravel materials, and if not, filling clay balls;

and 7, feeding the slurry into the feeding hopper and simultaneously feeding the gravel material or the clay balls according to the conclusion judged in the step 6, wherein the method specifically comprises the following steps:

step 71, adding the gravel or clay balls into the conduit along with the rotational flow;

step 72, controlling the water pumping amount of the water pump to enable the water pumping amount of the water pump to be equal to the water delivery amount of the water delivery pipe;

73, controlling the conduit to do uniform reciprocating circular motion around the well pipe, and when the conduit moves to the water pumping pipe, then moving in the reverse direction, and when the conduit reaches the water pumping pipe again, then moving in the reverse direction;

step 74, measuring the height of the charge level by using the filler top surface depth measuring instrument in the filling process, confirming that the charge level reaches the set height, lifting the guide pipe, and then refilling;

step 75, if the material level height reaches the height of the top of the current water-resisting layer or the aquifer, replacing the type of the filler; and

and 8, repeating the step 7 until the filling process is finished after the filling is carried out to the wellhead of the monitoring well.

2. A groundwater monitoring well flowing water swirling packing method according to claim 1, wherein the viscosity of the slurry in the step 3 is 17 seconds.

3. The method for swirling filling of flowing water in underground water monitoring well according to claim 1, wherein the filling rate in step 71 is 2-4m³/h。

4. A groundwater monitoring well flowing water rotational flow filling method as claimed in claim 1, wherein in the step 71, the viscosity of the slurry is continuously observed during filling clay balls, when the viscosity of the slurry is greater than or equal to 20 seconds, water is mixed with the slurry to reduce the viscosity of the slurry, and when the viscosity of the slurry reaches 17 seconds, water supply can be stopped to continue supplying the slurry.

5. The groundwater monitoring well kinetic water swirling filling method according to claim 1, wherein the water delivery amount per unit time is adjusted in the step 5, and the distance from the connecting line of the swirling liquid level edge to the bottom of the funnel is 2/3 from the liquid level edge to the bottom of the funnel.

6. The method for filling the dynamic water rotational flow of the underground water monitoring well according to claim 1, wherein the filler top surface measuring instrument comprises a bracket, a handle, a bobbin, a measuring probe, a cable, a buzzer, an indicator lamp and a battery;

the bobbin is a hollow cylinder and can rotate around a horizontal shaft on the bracket; the handle is fixed on the annular surface on one side of the spool and used for rotating the spool, winding and unwinding the cable and winding the cable on the spool; the battery is arranged on the side surface of the bobbin; the buzzer and the indicating lamp are connected to the cable in series; the cable consists of a positive sub cable and a negative sub cable with scales, wherein the first end of the positive sub cable is connected with the positive pole of the battery, and the first end of the negative sub cable is connected with the negative pole of the battery;

the measuring probe comprises a primary heavy hammer and a secondary heavy hammer; the upper end of the primary heavy hammer is provided with a metal negative terminal and a negative terminal insulating shell sleeved outside the negative terminal, the negative terminal is connected with a first end of a cable negative interface in a welding mode, and a second end of the cable negative interface is connected with a second end of the negative cable penetrating through the negative terminal insulating shell; the secondary heavy hammer is a hollow cylindrical body and is fixed in the middle of the cable, a hollow movable terminal is arranged at the lower end of the secondary heavy hammer and is connected with a negative terminal insulating shell of the primary heavy hammer in a sliding mode through the movable terminal, a cable positive interface and a limiting valve are arranged at the lower end of the movable terminal, and the limiting valve is used for preventing the movable terminal from being separated from the negative terminal insulating shell; the cable penetrates through the secondary heavy hammer and the movable terminal, a second end of a positive sub-cable of the cable penetrates through the movable terminal to be connected with a positive cable interface, and a second end of a negative sub-cable of the cable penetrates through the negative terminal insulating shell to be connected with a second end of a negative cable interface of the cable;

when the measuring instrument is suspended underground and the measuring probe is not in contact with the charge level, a circuit formed by the measuring probe and the battery is not connected and is in a power-off state, no current passes through the circuit, the buzzer does not sound, and the indicator light is not lightened; when the first-level heavy hammer of the measuring probe contacts the material level, the first-level heavy hammer stops sinking, the second-level heavy hammer sinks under the action of gravity to press the mobile terminal to move downwards, the mobile terminal drives the cable anode interface to move downwards after moving downwards, after the cable anode interface contacts the cathode terminal, the whole circuit forms a loop, current passes through the cable, the buzzer sounds, the indicator light is on, the situation that the probe reaches the material level is judged, and the scale on the cable is read, so that the height of the material level can be obtained.

7. The groundwater monitoring well flowing water cyclone filling method according to claim 1, wherein an angle of 30 degrees is formed between a tangent of an edge of the feeding funnel passing through the water feeding port and the edge of the funnel.

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