CN111927403A - Water pumping gravel-making recharging well and well forming process - Google Patents

Water pumping gravel-making recharging well and well forming process Download PDF

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Publication number
CN111927403A
CN111927403A CN202010665223.5A CN202010665223A CN111927403A CN 111927403 A CN111927403 A CN 111927403A CN 202010665223 A CN202010665223 A CN 202010665223A CN 111927403 A CN111927403 A CN 111927403A
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well
pipe
water
gravel
recharging
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周群道
张玲
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Shandong Dizi New Energy Technology Co ltd
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Shandong Dizi New Energy Technology Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
    • E03B3/32—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river
    • E03B3/34—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river of underground water
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/04—Gravelling of wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/08—Screens or liners
    • E21B43/086—Screens with preformed openings, e.g. slotted liners
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/04—Measuring depth or liquid level
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
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  • Hydrology & Water Resources (AREA)
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  • Water Supply & Treatment (AREA)
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Abstract

The invention discloses a pumping gravel-making recharging well and a well-forming process, wherein a cement cementing layer is used for sealing a mud layer of a water filtering section, so that the mud layer is prevented from contacting water flow in a well; forming a gravel forming space between the water filter pipe combination and the technical casing, and forming an accurate gravel forming layer under the action of water flow for pumping water; controlling the gravel diameter of the gravel layer by adjusting the distance between the trapezoidal wires of the water filtering combination; by the process, the problems of sand production and blockage of the recharging well, incapability of filling gravel and large-scale exploitation of river channel sand can be effectively solved; the method has the advantages of accurately separating the sand-mud layer, avoiding new suspended matters from being generated in the recharging process, increasing the recharging efficiency, enhancing the continuity and stability of recharging, and reducing the operation difficulty and the operation cost of recharging, and is an ideal water pumping gravel-making recharging well and well-forming process.

Description

Water pumping gravel-making recharging well and well forming process
Technical Field
The invention belongs to the technical field of groundwater and geothermal tail water recharging, and particularly relates to a water pumping gravel making recharging well and a well forming process.
Background
Shallow groundwater is widely developed and utilized due to good water quality, large-scale development causes great reduction of groundwater level, and geological environment problems such as ground settlement, ground cracks and the like are caused. Artificial recharge of shallow groundwater is an effective supplement means for natural replenishment, but because no limit of a suitable recharge well completion process exists, recharge generally needs to be carried out for 7 days after 3-4 days, and the smoothness of the recharge well can be maintained. The water source heat pump technology is the most efficient and economic utilization mode of shallow geothermal energy, and cannot be popularized and applied due to the problem that tail water is difficult to recharge.
In the fields of artificial recharge of shallow groundwater, tail water recharge of water source heat pump and geothermal tail water recharge of medium and deep layers, recharge of sandstone layers and quaternary unconsolidated layers is a worldwide difficult problem, blockage is easy to occur in the recharge process, high-frequency recharge dredging needs to be carried out, the recharge operation difficulty and economic cost are high, and popularization, application and development of artificial recharge of groundwater, tail water recharge and geothermal clean energy are severely restricted.
The two types of well completion processes adopted at present for recharging the geothermal tail water of the middle-deep sandstone thermal storage are only a large-caliber gravel packing process and a well cementation perforation process. Both of these well completion processes have drawbacks, which are embodied in: 1. as shown in fig. 1, when a well is formed by adopting a well cementation and perforation process, in an area with low consolidation degree of sandstone, mud and sand in an aquifer can enter the well casing through perforation holes, so that the condition of recharging and sand discharging occurs, the blockage and collapse of a water storage area at the bottom of the well can be easily caused, and the water discharging and recharging are influenced; 2. as shown in fig. 2, when the gravel is formed by adopting the large-caliber gravel packing process, the gravel filling difficulty is increased along with the increase of the well forming depth, so that the phenomena of insufficient gravel filling depth and sand blocking due to annular gap bridging are easily caused, and a mud layer cannot be separated during water taking, so that the technical difficulty and cost of recharging are increased; the use of this process requires the exploitation of a large amount of river sand for gravel packing, increases well construction costs and destroys the environment.
Disclosure of Invention
In order to overcome the defects of the prior art and improve the recharging effect, the invention provides a water pumping gravel-making recharging well and well completion process, which can solve the problem of sand production of the recharging well, accurately separate a sand layer from a mud layer, avoid the generation of new suspended matters in the recharging process, increase the recharging efficiency, enhance the continuity and stability of recharging, and reduce the operating difficulty and the operating cost of recharging.
In order to achieve the technical purpose, the invention adopts the following scheme: a pumping gravel-making recharging well comprises a pump chamber section, a well wall section and a water filtering section; the technical scheme is characterized in that a water filtering section is designed; in the water filtering section, a cement well cementation layer is arranged in an annular gap between the technical casing and a formation well wall; in the water filtering section, the penetration of the gravel forming space and the water-containing sand layer is realized through a technical sleeve and a cement well cementation layer by a perforation; a strainer combination is fixed in the technical casing through a centralizer and a hanger; the inner pipe of the strainer combination is a through hole petroleum casing pipe, and the outside of the strainer combination is a trapezoidal wire winding pipe; gravel of the water-containing sand layer is combined and sorted by the water filter pipe under the action of pumping water, and a gravel forming layer is formed in the gravel forming space.
The top of the strainer combination is fixed through a hanger, the bottom of the strainer combination is sealed through a pipe plug, and a bottom centralizer is arranged on the periphery of the strainer combination and is fixed with a technical casing in an extruding mode.
The inner pipe of the water filter pipe is a through-hole petroleum casing pipe, the diameter of holes of the through-hole petroleum casing pipe is 12-18 mm, and the density of the holes is 25-30 holes/m3And the adjacent holes are distributed in a staggered manner.
The outer layer of the strainer combination is a Johnson type trapezoid wire pipe, the small section of the strainer combination faces the inner side, a gap is arranged between the upper trapezoid wire and the lower trapezoid wire, the distance between the upper trapezoid wire and the lower trapezoid wire is 2/3 of aquifer sand grain d60, and the trapezoid wire pipe is fixed on the outer side of the petroleum casing.
The bottom end surface of the strainer combination is sealed by a pipe plug, and a water stop piece and a bottom centralizer are arranged between the outer diameter of the bottom end of the strainer combination and the inner wall of the cement well cementation layer.
The molding process of the water pumping gravel-making recharging well comprises the following steps:
1. drilling, wherein when the drilling depth is less than or equal to 200 meters, the aperture of three well sections, namely the pump chamber section, the well wall section and the water filtering section, is not less than 444.5 mm; when the drilling depth is more than 200 meters, the drilling aperture of the pump chamber section is not less than 444.5mm, the drilling aperture of the well wall section is not less than 311.2mm, and the drilling aperture of the water filtering section is not less than 311.2 mm;
2. comprehensive logging is carried out, the drilling fluid is kept to have good performance before logging, the well wall is kept to be stable, and the well bottom is kept clean; slowly keeping the speed at a constant speed when the logging well is lifted up or lowered down, wherein the speed is less than 0.25 m/s; the logging result interpretation of the water intake section should include: key parameters such as the lithology of a sand layer, the burial depth of an aquifer, the water content, the porosity of the sand layer, the permeability of the sand layer, the single-layer thickness of the sand layer, the content of mud and the like;
3. lowering the well pipe, and recharging the well in the middle-deep layer, wherein the pipe diameter is not less than 339.7 mm; the pipe diameter of the well wall section and the water filtering section is not less than 244.5 mm; the annular gap distance is controlled to be 30-50 mm; the pipe diameter of the shallow groundwater recharge well or the water source heat pump recharge well is not less than 339.7mm, and the annular space interval is controlled between 100 mm and 150 mm; the well pipe and the casing pipe are made of petroleum casing pipes, the steel grade is larger than J55, and the hole depth is corrected before the pipe is lowered; when the pipe is arranged in the whole well, a sedimentation pipe with the diameter of 30-50 m is arranged at the bottom; the lowering speed of the well pipe is not suitable to be too fast, and the unstable stratum is less than 0.3 m/s;
4. cementing a well, wherein a centralizer is arranged outside the water filter pipe combination in a well cementation area to ensure that the water filter pipe combination is arranged in the middle; the circulating drilling fluid is not less than 2 circulation weeks before well cementation; pumping into 2-3 m before injecting cement slurry3Clear water is used as a spacer fluid; in the process of injecting cement paste, the density of the cement paste is generally controlled to be 1.60-1.85 g/cm3To (c) to (d); the grade of the cement is not less than P.O 42.5.5; the cement setting time is more than or equal to 48 hours; when the surface casing is used for cementing, cement slurry returns to the ground surface; when the technical casing is used for cementing, the height of cement slurry is not lower than 400m, and the overlapped section of the casing is tightly sealed by cement;
5. and (3) perforating: the length of the perforation well section is not less than 80m, the diameter of the perforating gun is 100-130 mm, the diameter of the perforation is 10-15 mm, the hole density is greater than or equal to 15 holes/square meter, and the depth of the pore channel is greater than or equal to 600 mm;
6. hanging a water filtering pipe combination, wherein a hanger is arranged at the position 5-10 m away from the upper part of the water filtering section and used for hanging the water filtering pipe combination
7. And after the water filter pipes are assembled, the well is washed by adopting an air compressor or a well washing mode of pulling a piston, the maximum flow is pumped after the well is washed, and after the water is cleaned and sand is cleaned, the water is pumped for no less than 5 days to ensure the quality of pumped gravel.
The invention has the beneficial effects that: by the arrangement, the mud layer of the water filtering section is effectively sealed, and the mud layer is prevented from contacting with water flow in the well; forming a gravel forming space between the water filter pipe combination and the technical casing, and forming an accurate gravel forming layer through the water flow effect of pumping water; controlling the gravel diameter of the gravel layer by adjusting the distance between the trapezoidal wires of the water filtering combination; by the process, the problems of sand production and blockage of the recharging well, insufficient gravel filling and large-amount exploitation of river channel sand can be effectively solved; the method has the advantages of accurately separating the sand-mud layer, avoiding generating new suspended matters in the recharging process, increasing the recharging efficiency, enhancing the continuity and stability of recharging, reducing the operation difficulty and the operation cost of recharging, and being an ideal water pumping gravel-making recharging well and well-forming process.
Drawings
FIG. 1 is a schematic view of a well structure formed by a well cementing perforation process;
FIG. 2 is a schematic view of a well structure formed using the large bore packing process;
FIG. 3 is a schematic view of the internal structure of the present invention after molding and before pelletizing;
FIG. 4 is a schematic view of the inner structure of the gravel pack of the present invention;
FIG. 5 is an enlarged view of the structure of area A in FIG. 3;
FIG. 6 is a log value comparison;
in the attached drawings, 1, a filter pipe combination, 10, a through hole petroleum casing, 11, a suspension boss, 12, a through hole, 13, a bottom boss, 14, a pipe plug, 15, silt, 16, a gravel packing region, 17, a pump chamber section, 18, a well wall section, 19, a water filtering section, 2, a Johnson trapezoidal wire pipe, 20, a suspension device, 21, an outer expanding conical surface, 3, a centralizer, 31, a bottom centralizer, 4, a water stopping element, 5, a gravel forming space, 51, a gravel forming layer, 6, a technical casing, 7, a cement well fixing layer, 71, a perforation, 8, a stratum well wall, 9, a water-containing sand layer, 30 and a mud layer.
Detailed Description
Referring to the attached drawings, the structure of the water pumping gravel making recharging well is described as follows: the device comprises a pump chamber section 17, a well wall section 18 and a water filtering section 19; the technical scheme is characterized in that: as shown in fig. 3, in the water filtering section 19, a cement cementing layer 7 is arranged between a formation well wall 8 and a technical casing 6 at the position of an interbedded layer of a water-containing sand layer 9 and a mud layer 30, the technical casing 6 is arranged on the inner layer of the cement cementing layer 7, and the water filtering pipe combination 1 is fixed inside the technical casing 6 through a centralizer 3; a gravel forming space 5 is formed between the outer diameter of the strainer combination and the inner diameter of the technical casing; the cement well cementation layer 7 and the technical casing 6 are provided with perforations 71, and the penetration of the gravel forming space 5 and the water-containing sand layer 9 is realized by the perforation 71 through the technical casing 6 and the cement well cementation layer 7; the sand of the water-containing sand layer 9 flows through the perforations 71 into the gravel formation space 5, and a gravel formation layer 51 is formed in the gravel formation space 5. Further, the structure is limited, a hanger 20 is arranged at the top of the strainer pipe assembly 1, the strainer pipe assembly 1 is composed of an internal through hole petroleum casing 10 and a Johnson type trapezoid wire pipe 2 wrapped outside the through hole petroleum casing, and a hanging boss 11 is arranged at the top of the through hole petroleum casing 10 and used for lap hanging with the hanger 20; the wall of the water filtering pipe 10 is provided with a through hole 12, the diameter of the through hole is 15mm, and the density of the holes is 28 holes/m3And the adjacent holes are distributed in a staggered manner.
The cross section of the above-mentioned johnson type trapezoid wire pipe 2 is a triangular or wedge-shaped structure, the sharp angle of the cross section faces to the inner side, the joint of two adjacent upper and lower filter rings is provided with a gap, the gap gradually increases towards the inner side to form an outer expanding conical surface 21, the distance between two adjacent johnson type trapezoid wire pipes 2 is 2/3 of aquifer sand d60, and the johnson type trapezoid wire pipe is fixed on the outer side of the through hole oil casing 10 by welding;
the bottom end face of the strainer pipe combination 1 is sealed through a pipe plug 14, and a rubber water stop 4 and a bottom centralizer 31 are arranged between the outer diameter of the bottom end of the strainer pipe combination 1 and the inner wall of a cement well cementation layer 7 and used for achieving centering correction and water stop setting of the strainer pipe combination 1.
The molding process of the water pumping gravel-making recharging well comprises the following specific steps:
example 1:
1. and (3) performing drilling operation, wherein the drilling depth of the intermediate-deep recharging well or the water source heat pump recharging well is 1600m, and the well comprises a pump chamber section 18, a well wall section 17 and a water filtering section 19, wherein the drilling aperture of the pump chamber section 18 is not less than 444.5mm, and the length of the pump chamber section is 300 m. The borehole wall section 17 has a borehole diameter of not less than 311.2mm and a length of the borehole wall section 17 of 1100 m. The bore diameter of the water filtering section 19 is not less than 311.2mm, and the actual length of the water filtering section 19 is 200 m.
2. Comprehensive well logging and well logging requirements are as follows: before logging, the performance of the drilling fluid is kept good, the well wall is kept stable, and the well bottom is kept clean; slowly and uniformly lifting or lowering the logging well, wherein the lifting or lowering speed is less than 0.25 m/s;
the logging project should include: well wall thickness, porosity, permeability, water saturation, shale content, acoustic wave time difference, resistivity, temperature and thickness; the specific logging values are operated against figure 6;
3. the well casing is transferred, after logging is completed, the well casing is transferred, and the pipe is discharged according to the specification: a pump chamber section of a middle-deep layer recharging well or a water source heat pump recharging well, wherein the pipe diameter is 339.7 mm; the pipe diameter of the well wall section and the water filtering section is 244.5 mm; maintaining reasonable annular gaps of the hole pipes, wherein the annular gap distance is generally controlled to be 40 mm; the shallow groundwater recharge well has a pipe diameter of 339.7mm, and maintains reasonable annular space of the hole pipe, and the annular space distance is generally controlled at 120 mm; well pipe quality: the well pipe and the casing pipe are made of petroleum casing pipes, the steel grade is larger than J55, and the hole depth is corrected before pipe laying; when the pipe is arranged in the whole well, a 40m settling pipe is arranged at the bottom; the lowering speed of the well pipe is not suitable to be too fast, and the unstable stratum is less than 0.3 m/s;
4. cementing, namely cementing after the lower part of the well casing, wherein the cementing quality is as follows: before well cementation, cement slurry thickening time test work is required to be done so as to ensure construction quality and well cementation safety; a centralizer 3 is installed on the well casing in the well cementation section to ensure that the well casing is centered; the circulating drilling fluid is not less than 2 circulation weeks before well cementation; before the cement slurry is injected, 3 cubic meters of clear water is pumped as a spacer fluid; in the process of injecting the cement paste, the density of the cement paste and the change of pump pressure are monitored at any time; the density of the cement slurry is generally controlled to be between 1.70 g/cubic meter; the cement designation is P.O 42.5.5; the cement setting time is more than or equal to 48 hours; a well cementation section: when the surface casing is used for cementing, cement slurry returns to the ground surface; when the technical casing is used for cementing, the height of cement slurry is not lower than 400m, and the overlapping section of the technical casing is tightly sealed by cement;
5. and (3) perforating: before perforation operation, perforating fluid compatible with the stratum is prepared according to the characteristics of the stratum, and when the stratum conditions are good, the drilling fluid can be completely replaced by clear water; the length of the perforation well section is determined according to geological logging and logging data, and is generally not less than 80m, the diameter of a perforating gun is 127mm, the diameter of a perforation is 12mm, and the density of holes is 20 holes/m3The depth of the pore channel is more than or equal to 600 mm;
6. suspending a strainer pipe combination, suspending the strainer pipe combination after well cementation and perforation, and arranging a hanger 20 at the upper 10m of a perforation and water filtration section for suspending the strainer pipe combination 1; the inner layer of the filter pipe combination 1 is a petroleum casing pipe as an inner filter pipe, holes are preset on the filter pipe, the diameter of each hole is 15mm, and the density of each hole is 30 holes/m3The adjacent holes are distributed in a staggered mode, and the outer layer of the strainer combination is a Johnson type trapezoid wire pipe; the bottom of the water filtering pipe combination is provided with a 40m settling pipe, and a pipe plug 14 is arranged at the pipe orifice of the bottom; when the water filtering pipe combination 1 is hung, a centralizer is installed to ensure that the water filtering pipe combination is positioned in the center of the perforated pipe, and 3 groups of rubber umbrellas are distributed at the position 5m below the water filtering section 19 to be used as a water stopping piece 4 for stopping water;
7. after the water filter pipes are assembled and installed, firstly, a well is washed by adopting an air compressor or a well washing mode of pulling a piston, then, water is pumped at the maximum flow, and after the water is cleaned and sand is removed, the water is continuously pumped for no less than 5 days to ensure the quality of pumped gravel;
and (4) well completion test and productivity test, wherein after pumping water and gravel formation are completed, a pumping test is carried out, and test evaluation work of the permeability and water yield of the well is carried out.

Claims (6)

1. A pumping gravel-making recharging well comprises a pump chamber section, a well wall section and a water filtering section; the method is characterized in that: in the water filtering section, a cement well cementation layer is arranged in an annular gap between the technical casing and the formation well wall; in the water filtering section, the penetration of the gravel forming space and the water-containing sand layer is realized through a perforation penetration technical sleeve and a cement well cementation layer; a strainer combination is fixed in the technical casing through a centralizer and a hanger; the inner pipe of the strainer combination is a through hole petroleum casing pipe, and the outside of the strainer combination is a trapezoidal wire winding pipe; gravel of the water-containing sand layer is combined and sorted by the water filter pipe under the action of pumping water, and a gravel forming layer is formed in the gravel forming space.
2. The pumped gravel-making recharging well of claim 1, wherein: the top of the strainer combination is fixed through a hanger, the bottom of the strainer combination is sealed through a pipe plug, and a bottom centralizer is arranged on the periphery of the strainer combination and is fixed with a technical casing in an extruding mode.
3. The pumped gravel-making recharging well of claim 1, wherein: the inner tube of strainer be through-hole oil casing, its punchhole diameter is 12 ~ 18mm, punchhole density is 25 ~ 30 holes/m thin year, adjacent punchhole crisscross distribution.
4. The pumped gravel-making recharging well of claim 3, wherein: the outer layer of the strainer combination is a Johnson type trapezoid wire pipe, the small section of the strainer combination faces the inner side, a gap is arranged between the upper trapezoid wire and the lower trapezoid wire, the distance between the upper trapezoid wire and the lower trapezoid wire is 2/3 of aquifer sand grain d60, and the trapezoid wire pipe is fixed on the outer side of the petroleum casing.
5. The pumped gravel-making recharging well of claim 1, wherein: the bottom end surface of the strainer combination is sealed through a pipe plug, and a water stop piece and a bottom centralizer are arranged between the outer diameter of the bottom end of the strainer combination and the inner wall of the cement well cementation layer.
6. The well completion process for pumping gravel-making recharge wells according to claim 1, wherein:
the molding process comprises the following steps:
1. drilling, wherein when the drilling depth is less than or equal to 200 meters, the aperture of three well sections, namely a pump chamber section, a well wall section and a water filtering section, is not less than 444.5 mm; when the drilling depth is more than 200 meters, the drilling aperture of the pump chamber section is not less than 444.5mm, the drilling aperture of the well wall section is not less than 311.2mm, and the drilling aperture of the water filtering section is not less than 311.2 mm;
2. comprehensive logging is carried out, the drilling fluid is kept to have good performance before logging, the well wall is kept to be stable, and the well bottom is kept clean; slowly keeping the speed at a constant speed when the logging well is lifted or lowered, wherein the speed is less than 0.25 m/s;
3. lowering the well pipe, and pumping the pump section of the middle-deep recharging well or the water source heat pump recharging well, wherein the pipe diameter is not less than 339.7 mm; the pipe diameter of the well wall section and the water filtering section is not less than 244.5 mm; the annular gap distance is controlled to be 30-50 mm; the pipe diameter of the shallow groundwater recharge well is not less than 339.7mm, and the annular space interval is controlled to be 100-150 mm; the well pipe and the casing pipe are made of petroleum casing pipes, the steel grade is larger than J55, and the hole depth is corrected before the pipe is arranged; when the pipe is arranged in the whole well, a sedimentation pipe with the diameter of 30-50 m is arranged at the bottom; the lowering speed of the well pipe is less than 0.3 m/s;
4. cementing a well, wherein a centralizer is arranged outside the water filter pipe combination in a well cementation area to ensure that the water filter pipe combination is arranged in the middle; the circulating drilling fluid is not less than 2 circulation weeks before well cementation; pumping into 2-3 m before injecting cement slurry3Clear water is used as spacer fluid; in the process of injecting cement paste, the density of the cement paste is generally controlled to be 1.60-1.85 g/cm3To (c) to (d); the grade of the cement is not less than P.O 42.5.5; the cement setting time is more than or equal to 48 hours; when the technical casing is used for cementing, the height of cement slurry is not lower than 400m, and the overlapped section of the casing is tightly sealed by cement;
5. and (3) perforating: the length of the perforation well section is not less than 80m, the diameter of the perforating gun is 100-130 mm, the diameter of the perforation is 10-15 mm, the hole density is greater than or equal to 15 holes/square meter, and the depth of the pore channel is greater than or equal to 600 mm;
6. hanging a strainer combination, wherein a hanger is arranged at a position 5-10 m away from the upper part of the strainer section for hanging the strainer combination
7. And after the well washing and water pumping are finished, the well washing is carried out by adopting a well washing mode of an air compressor or a pull piston, and the water is pumped after the well washing, wherein the water pumping is not less than 5 days.
CN202010665223.5A 2020-07-11 2020-07-11 Water pumping gravel-making recharging well and well forming process Pending CN111927403A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113279451A (en) * 2021-06-21 2021-08-20 中国建筑第四工程局有限公司 Full-automatic monitoring and recharging device next to underground deep foundation pit underground water level of subway
CN114452712A (en) * 2022-02-08 2022-05-10 核工业北京化工冶金研究院 Solid-liquid separation device in reinjection water well
CN114658395A (en) * 2022-04-14 2022-06-24 河北省地质矿产勘查开发局第三水文工程地质大队(河北省地热资源开发研究所) Method for improving recharge quantity of sandstone heat storage geothermal well
CN114893155A (en) * 2022-07-11 2022-08-12 河北省地质矿产勘查开发局第一地质大队(河北省清洁能源应用技术中心) Well completion device and method of ground source heat pump
CN116857008A (en) * 2023-08-30 2023-10-10 中国煤炭地质总局勘查研究总院 Composite drilling method for mine water deep storage and ground drainage

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113279451A (en) * 2021-06-21 2021-08-20 中国建筑第四工程局有限公司 Full-automatic monitoring and recharging device next to underground deep foundation pit underground water level of subway
CN114452712A (en) * 2022-02-08 2022-05-10 核工业北京化工冶金研究院 Solid-liquid separation device in reinjection water well
CN114452712B (en) * 2022-02-08 2023-03-14 核工业北京化工冶金研究院 Solid-liquid separation device in reinjection water well
CN114658395A (en) * 2022-04-14 2022-06-24 河北省地质矿产勘查开发局第三水文工程地质大队(河北省地热资源开发研究所) Method for improving recharge quantity of sandstone heat storage geothermal well
CN114658395B (en) * 2022-04-14 2024-02-23 河北省地质矿产勘查开发局第三水文工程地质大队(河北省地热资源开发研究所) Method for improving recharge quantity of sandstone heat Chu Dere well
CN114893155A (en) * 2022-07-11 2022-08-12 河北省地质矿产勘查开发局第一地质大队(河北省清洁能源应用技术中心) Well completion device and method of ground source heat pump
CN114893155B (en) * 2022-07-11 2022-09-20 河北省地质矿产勘查开发局第一地质大队(河北省清洁能源应用技术中心) Well completion device and method of ground source heat pump
CN116857008A (en) * 2023-08-30 2023-10-10 中国煤炭地质总局勘查研究总院 Composite drilling method for mine water deep storage and ground drainage
CN116857008B (en) * 2023-08-30 2023-11-03 中国煤炭地质总局勘查研究总院 Composite drilling method for mine water deep storage and ground drainage

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