CN114991750B - Casing pipe connection method of U-shaped totally-enclosed geothermal communication well - Google Patents
Casing pipe connection method of U-shaped totally-enclosed geothermal communication well Download PDFInfo
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- CN114991750B CN114991750B CN202210680978.1A CN202210680978A CN114991750B CN 114991750 B CN114991750 B CN 114991750B CN 202210680978 A CN202210680978 A CN 202210680978A CN 114991750 B CN114991750 B CN 114991750B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004891 communication Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims abstract description 6
- 238000007667 floating Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 210000000988 bone and bone Anatomy 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 210000002435 tendon Anatomy 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims 2
- 230000005484 gravity Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000003756 stirring Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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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
- E21B47/00—Survey of boreholes or wells
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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
- 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
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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
- 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
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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
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a sleeve connecting method of a U-shaped totally-enclosed geothermal communication well, which belongs to the technical field of geothermal communication wells and comprises the following steps: s1: comprehensive logging projects include well depth, well deviation, well diameter, well temperature, natural potential, natural gamma, resistivity and the like; s2: before logging, a drilling tool and a drill bit through hole are needed to be used, so that a logging probe is prevented from being blocked and blocked, and a pump is started to circulate after the through hole is completely arranged at the bottom of the well, so that the performance index of drilling fluid in the well is kept stable and consistent up and down; s3: the simple tool with the same diameter as the original well is used for reaming, and the drilling tool is moved in a series and rotated from shallow to deep in the well by lifting and rotating the drilling machine. The invention has the beneficial effects that before the casing is put down, the ground equipment and the casing tool are checked, and because the casing which is put down at one time has large weight, the floating plate method is adopted for safety, the water level in the well pipe is strictly observed in the pipe-down process, and the liquid level inside and outside the well pipe is ensured to be basically consistent.
Description
Technical Field
The invention relates to the field of geothermal communication wells, in particular to a sleeve connecting method of a U-shaped totally-enclosed geothermal communication well.
Background
Geothermal well 1 refers to a method and a device for generating electricity by using geothermal energy with the well depth of about 3500 meters or hot spring water with the water temperature of more than 30 ℃, geothermal energy is divided into three types of high temperature, medium temperature and low temperature, the wellhead sleeve head of the medium and high temperature geothermal well 1 is subjected to great thermal stress, and if the structure is improper, the wellhead can be seriously damaged. The reasonable casing head structure should allow the production casing to be axially thermally telescopic, have a righting effect on the production casing and can drain the gas in the mud ring.
The existing sleeve connecting method of the u-shaped fully-closed geothermal communication well is easy to cause the accident of squeezing the well wall pipe or the filter pipe in the connecting process, has no test process before pipe discharging, and cannot strictly control the liquid level inside and outside the well pipe in the pipe discharging process.
Disclosure of Invention
The invention aims to provide a sleeve connecting method of a U-shaped totally-enclosed geothermal communication well, which aims to solve the problems in the background technology.
The technical scheme of the invention is as follows: the sleeve connection method of the U-shaped totally-enclosed geothermal communication well comprises the following steps:
S1: comprehensive logging projects include well depth, well deviation, well diameter, well temperature, natural potential, natural gamma, resistivity and the like;
S2: before logging, a drilling tool and a drill bit through hole are needed to be used, so that a logging probe is prevented from being blocked and blocked, and a pump is started to circulate after the through hole is completely arranged at the bottom of the well, so that the performance index of drilling fluid in the well is kept stable and consistent up and down;
s3: a simple tool with the same diameter as the original well diameter is adopted for reaming, and a drilling tool is moved in series and rotated from shallow to deep in the well through lifting and rotation of a drilling machine;
s4: the wall breaking is a basic link in the well forming process of the geothermal well, and aims to remove mud skin of a well wall and dredge pores of an aquifer;
S5: before the pipe is put down, the hole depth must be corrected, the well pipe sequence is checked, no error is ensured, the position of the sleeve pipe is strictly corresponding to the well logging position, and the codes are encoded according to the sleeve pipe sequence;
s6: the casing pipe entering the well should be strictly checked for appearance, length, drift diameter, steel grade, wall thickness, well entering mode and the like, and the data are well recorded;
S7: checking ground equipment before pipe laying, and checking whether steel wire ropes, bars, elevator, slips and the like for the pipe laying are good;
S8: in the well section of 0-1100m, the weight of the casing pipe which is put in at one time is very large, so that the floating plate method is adopted for safety, and the buoyancy of slurry to the well pipe is utilized, so that the weight of the whole pipe column is reduced;
s9: in the process of pipe discharging, the water level in the well pipe is strictly observed, so that the water level inside and outside the well pipe is basically consistent, and the phenomenon that the well pipe or the filter pipe is extruded and destroyed due to negative pressure is prevented:
s10: after the casing is put down, the drill rod is put down from the inside of the casing to a position 1m away from the depth of the hole bottom, and then the drill rod is sealed and fixed by a steel plate along the casing opening.
Further, the geothermal well 1 comprises a u-shaped horizontal well and a vertical well, wherein one side of the u-shaped horizontal well is communicated with the vertical well, and the vertical well and the u-shaped horizontal well are completely isolated from the stratum.
Further, in the step S2, the mud density is 1.10+/-and the viscosity is less than 23S.
Further, in the step S3, the reaming must be repeated several times in the section prone to well deviation to ensure the rounding of the well bore.
Further, the cumulative length of the well pipe recorded in the step S5 should be consistent with the actual well depth, and the error should not exceed 1m.
Furthermore, the casing in the vertical well is connected in a penetrating manner, and the grinding shoes are arranged in the vertical well again to penetrate the casing in the horizontal well, so that the vertical well and the horizontal well are communicated in a totally-closed manner and sealed.
Further, in the step S7, before each casing running, after the casing running is successfully run with a casing length of not less than 12m, the casing can be run into the hole for a grasping time.
Further, in the step S8, the buoyancy plug must be subjected to a sealing test before use, and the thickness of the steel plate of the buoyancy plug is not less than 20mm.
Furthermore, recharging is needed when the liquid level difference in the step S9 exceeds 10m, ribs of the tendons and bones are welded on the outside of the filter every 20m to serve as centralizers, and the diameter of the centralizers is 20-30 mm smaller than the diameter of the pore.
Further, in the step S10, clean water or slurry is pumped into the hole through the drill rod, and the clean water or slurry enters the gap between the sleeve and the hole wall through the slurry return hole to be pumped into the hole.
Compared with the prior art, the invention provides the sleeve connecting method of the U-shaped totally-enclosed geothermal communication well by improving, and has the following improvements and advantages:
The invention relates to a sleeve connecting method of a U-shaped totally-enclosed geothermal communication well, which is characterized in that the depth of a hole is required to be corrected before the sleeve is put down, the sequence of a well pipe is checked, the appearance of the well-entering sleeve is required to be strictly checked, the length, the drift diameter and the steel grade are measured, the wall thickness is measured and recorded, especially the well-entering record is recorded, before the sleeve is put down, the ground equipment and a sleeve tool are required to be checked, because the weight of the once-in sleeve is very large, for safety, the floating plate method is adopted, the water level in the well pipe is required to be strictly observed during the process of putting down the pipe, the substantial consistency of the liquid level inside and outside the well pipe is ensured, meanwhile, a sand setting pipe with the diameter of 10m-20m is required to be arranged at the lower end of a filter for sealing gravel material and sediment, then 3 slurry returning holes with the diameter of 25 mm are cut at the position of about 1m at the bottom of one sleeve at the lowest part after the sleeve is finished, cement slurry after stirring is pumped from the inner pressure of a drill pipe until cement slurry is returned from an orifice for 4h-6h, and after the sleeve sealing steel plate at the sleeve opening is closed, the sleeve is required to be put up.
Drawings
The invention is further explained below with reference to the drawings and examples:
FIG. 1 is a schematic diagram of the steps of the present invention;
FIG. 2 is a schematic flow chart of the present invention;
fig. 3 is a schematic structural view of a geothermal well 1 according to the present invention.
Reference numerals illustrate: geothermal well (1), u-shaped horizontal well (101), vertical well (102).
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in detail with reference to fig. 1 to 3, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a sleeve connecting method of a U-shaped totally-enclosed geothermal communication well by improving the sleeve connecting method, which is shown in figures 1-3 and comprises the following steps:
S1: comprehensive logging projects include well depth, well deviation, well diameter, well temperature, natural potential, natural gamma, resistivity and the like; s2: before logging, a drilling tool and a drill bit through hole are needed to be used, so that a logging probe is prevented from being blocked and blocked, and a pump is started to circulate after the through hole is completely arranged at the bottom of the well, so that the performance index of drilling fluid in the well is kept stable and consistent up and down; s3: a simple tool with the same diameter as the original well diameter is adopted for reaming, and a drilling tool is moved in series and rotated from shallow to deep in the well through lifting and rotation of a drilling machine; s4: the wall breaking is a basic link in the well forming process of the geothermal well 1, and aims to remove mud skin of a well wall and dredge pores of an aquifer; s5: before the pipe is put down, the hole depth must be corrected, the well pipe sequence is checked, no error is ensured, the position of the sleeve pipe is strictly corresponding to the well logging position, and the codes are encoded according to the sleeve pipe sequence; s6: the casing pipe entering the well should be strictly checked for appearance, length, drift diameter, steel grade, wall thickness, well entering mode and the like, and the data are well recorded; s7: checking ground equipment before pipe laying, and checking whether steel wire ropes, bars, elevator, slips and the like for the pipe laying are good; s8: in the well section of 0-1100m, the weight of the casing pipe which is put in at one time is very large, so that the floating plate method is adopted for safety, and the buoyancy of slurry to the well pipe is utilized, so that the weight of the whole pipe column is reduced; s9: in the process of pipe discharging, the water level in the well pipe is strictly observed, so that the water level inside and outside the well pipe is basically consistent, and the phenomenon that the well pipe or the filter pipe is extruded and destroyed due to negative pressure is prevented: s10: after the casing is put down, the drill rod is put down from the inside of the casing to a position 1m away from the depth of the hole bottom, and then the drill rod is sealed and fixed by a steel plate along the casing opening.
Geothermal well 11 comprises a u-shaped horizontal well 101101 and a vertical well 102102, wherein vertical well 102102 is connected to one side of u-shaped horizontal well 101101, and vertical well 102102 and u-shaped horizontal well 101101 are completely isolated from the formation. In the step S2, the mud density is 1.10+/-and the viscosity is less than 23S. In the step S3, the reaming must be repeated several times in the section easy to incline so as to ensure the rounding of the well bore. The accumulated length of the well pipe recorded in the step S5 is consistent with the actual well depth, and the error is not more than 1m. The casing in the vertical well 102 is connected therethrough. In step S7, before each casing running, the casing is run into the hole after the casing is run into the well with a length of not less than 12 m. The buoyancy plug in the step S8 is required to be subjected to a sealing test before being used, and the thickness of the steel plate of the buoyancy plug is not less than 20mm. And when the liquid level difference in the step S9 exceeds 10m, recharging is needed, ribs of the tendons and bones are welded on the outside of the filter every 20m to serve as centralizers, and the diameter of the centralizers is 20-30 mm smaller than the diameter of the pore. And step S10, clean water or slurry is pumped into the hole through the drill rod, and the clean water or slurry enters the gap between the sleeve and the hole wall through the slurry return hole to be pumped into the hole.
The vertical well 102 is put into a mill shoe to drill through the sleeve put into the u-shaped horizontal well 101, so that the sleeve of the vertical well 102 is communicated with the sleeve of the u-shaped horizontal well 101; the U-shaped horizontal well 101 is well cemented by adopting non-permeable cement, so that the casing is completely isolated from the stratum without permeability, and the U-shaped communication between the vertical well 102 and the U-shaped horizontal well 101 and the complete isolation from the stratum are realized in the above mode.
Working principle: firstly, using a drilling tool and a drill bit through hole to prevent a logging probe from meeting blockage and meeting clamping, opening a pump circulation after the whole bottom of the through hole so as to ensure that the performance index of drilling fluid in a well is stable and consistent up and down, then detecting a comprehensive project by a geothermal communication well, wherein the detection content comprises well depth, well deviation, well diameter, well temperature, natural potential, natural gamma, resistivity and the like, accurately butting and communicating a u-shaped horizontal well 101 with a vertical well 102, continuously drilling for 10-15 m after the u-shaped horizontal well 101 drills through a casing pipe of the vertical well 102, slowly and uniformly stirring the logging probe and a cable in the tripping process in the logging process to prevent the pumping effect, the simple tool with the same original borehole diameter is adopted for reaming, and the specific method is that a drilling tool is used for moving and swinging from shallow to deep up and down in the well by lifting and swinging a drilling machine, and particularly, the reaming must be repeated for a plurality of times in a section easy to incline so as to ensure the rounding of the borehole. The wall breaking is a basic link in the well forming process of the geothermal well 1, and aims to remove mud skin of a well wall, dredge pores of an aquifer, prepare for well flushing, determine clear water circulation time according to the conditions in the well during wall breaking so as to remove mud skin to the greatest extent, clean the wall of the well, correct the depth of the well before pipe descending, check the sequence of a well pipe, ensure no error, ensure that the position of the filter pipe corresponds to the position of the aquifer in well logging data strictly, encode according to the sequence, ensure that the accumulated length of the well pipe accords with the actual well forming depth, and ensure that the error does not exceed 1m. The appearance of the well-entering casing is strictly checked, the length, the drift diameter and the steel grade are measured, the wall thickness is measured and recorded, particularly the well-entering record is made, the connection mode of the casing is that before each time of casing is put into the well, the well-entering section is smoothly put into the hole by the casing with the length of not less than 12 m; before the sleeve is put down, ground equipment is processed, including a derrick, a foundation pier, a base, lacing wires, a cat head wheel, a lifting system, a steel rope, a weight indicator, a drill transmission part, a brake system, a slurry pump, a motor and the like, and whether the steel rope, a cross bar, an elevator, a slip and the like for the sleeve are good or not is checked; in the well section of 0m-1100m, the weight of the casing pipe which is put in at one time is very large, so that the buoyancy of slurry to the well pipe is utilized to reduce the weight of the whole pipe column for safety. The lower pipe requires that the buoyancy plug must be subjected to a sealing test before use, and the thickness of the steel plate of the buoyancy plug is not less than 20mm; the well pipe is put down to the bottom of the hole, and clear water is filled in the well pipe above the buoyancy plug to release the buoyancy plug. The 1100m-1550m well section adopts a pipe feeder direct hoisting method, the sleeve penetrating length is not less than 10m, the u-shaped horizontal well 101 is sleeved and penetrates through the sleeve of the vertical well 102, a drill bit penetrates through the sleeve of the vertical well 102 when the u-shaped horizontal well 101 drills, well cementation is carried out after the sleeve penetrates through the sleeve of the vertical well 102 by adopting non-permeable cement, and complete isolation of the sleeve and stratum is achieved without permeability. Wherein, the casing string structure comprises a wood guide shoe, a casing shoe, a cyclone nipple, a water stopper and a casing string, and the vertical well 102 is ground through the casing which is put into the u-shaped horizontal well 101 by using a special anti-slip grinding shoe to realize the full sealing and communication of the vertical well 102 and the u-shaped horizontal well 101, the water level in the well pipe is strictly observed in the pipe-setting process, the liquid level inside and outside the well pipe is ensured to be basically consistent, the collapse accident of the well pipe or a filter pipe caused by negative pressure is prevented, the recharging is needed when the liquid level difference exceeds 10m, the special cement with high heat conduction and good sealing performance is used for cementing after the casing is put into the u-shaped horizontal well 101, in order to avoid the influence of the water outlet caused by the irregular accumulation of gravel in the gravel filling process, the rib of the rib is welded on the outside of the filter every 20m to be used as a centralizer, and the diameter of the centralizer is 20mm-30mm than the aperture. Meanwhile, a 10m-20m sand setting pipe is arranged at the lower end of the filter for sealing the gravel material and settling the sediment. Finally, cutting 3 slurry return holes with the diameter of 25 mm at the bottom of the lowest sleeve by about 1 meter, after the sleeve is put down, lowering a drill rod from the inside of the sleeve to the position with the depth of 1 meter from the bottom of the hole, then sealing and fixing the drill rod along the sleeve opening by using a steel plate, pumping clean water or slurry into the hole through the drill rod, enabling the clean water or slurry to enter the gap between the sleeve and the hole wall by the slurry return holes, returning the clean water or slurry to the ground, after the circulation is normal, injecting cement into the vertical well 102 and the communicating position by using the inner pressure of the drill rod by using the slurry pump for stirring, simultaneously directly injecting cement into the u-shaped horizontal well 101, and may be drilled directly through the casing, where it may be passed through the vertical well 102 and then cased again and cemented. The method is equivalent to the joint of the vertical well 102 which is closed loop until cement slurry is returned from the orifice, then a proper amount of clean water is used for cleaning residual cement slurry in the drill rod, after the drill rod is stopped for 4-6 hours, a sleeve opening sealing steel plate is opened, the drill rod is lifted out of the sleeve, at this time, the surface layer sleeve cementing work can be completed, the vertical well 102 needs to be pumped, and the sleeve of the underground u-shaped horizontal well 101 is perforated, so that the communication can be realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The sleeve connecting method of the u-shaped totally-enclosed geothermal communication well is characterized by comprising the following steps of:
s1: comprehensive logging projects include well depth, well deviation, well diameter, well temperature, natural potential, natural gamma and resistivity;
S2: before logging, a drilling tool and a drill bit through hole are needed to be used, so that a logging probe is prevented from being blocked and blocked, and a pump is started to circulate after the through hole is completely arranged at the bottom of the well, so that the performance index of drilling fluid in the well is kept stable and consistent up and down;
s3: a simple tool with the same diameter as the original well diameter is adopted for reaming, and a drilling tool is moved in series and rotated from shallow to deep in the well through lifting and rotation of a drilling machine;
S4: the wall breaking is a basic link in the well forming process of the geothermal well (1), and aims to remove mud skin of a well wall and dredge pores of an aquifer;
S5: before the pipe is put down, the hole depth must be corrected, the well pipe sequence is checked, no error is ensured, the position of the sleeve pipe is strictly corresponding to the well logging position, and the codes are encoded according to the sleeve pipe sequence;
s6: the casing pipe entering the well is strictly checked for appearance, length measurement, drift diameter, steel grade, wall thickness measurement and well entering mode, and data are recorded;
s7: checking ground equipment before pipe laying, and checking whether steel wire ropes, bars, elevator and slips for the lower sleeve are good or not;
S8: in the well section of 0-1100m, the weight of the casing pipe which is put in at one time is very large, so that the floating plate method is adopted for safety, and the buoyancy of slurry to the well pipe is utilized, so that the weight of the whole pipe column is reduced;
s9: in the process of pipe discharging, the water level in the well pipe is strictly observed, so that the water level inside and outside the well pipe is basically consistent, and the phenomenon that the well pipe or the filter pipe is extruded and destroyed due to negative pressure is prevented:
S10: after the casing is put down, the drill rod is put down from the inside of the casing to a position 1m away from the depth of the hole bottom, and then the drill rod is sealed and fixed by a steel plate along the casing opening;
The geothermal well (1) comprises a u-shaped horizontal well (101) and a vertical well (102), wherein one side of the u-shaped horizontal well (101) is communicated with the vertical well (102), and the vertical well (102) and the u-shaped horizontal well (101) are completely isolated from a stratum;
The casing in the vertical well (102) is connected in a penetrating way;
before each casing running, the step S7 should be performed successfully by using a casing with the length of not less than 12m, and then the casing can be run into the hole after the casing is gripped for a certain time;
in the step S8, the buoyancy plug is required to be subjected to a sealing test before being used, and the thickness of the steel plate of the buoyancy plug is not less than 20mm;
And when the liquid level difference in the step S9 exceeds 10m, recharging is needed, ribs of the tendons and bones are welded on the outside of the filter every 20m to serve as centralizers, and the diameter of the centralizers is 20-30 mm smaller than the diameter of the pore.
2. The sleeve connection method of the u-shaped totally-enclosed geothermal communication well according to claim 1, wherein the sleeve connection method comprises the following steps: in the step S2, the mud density is 1.10+/-and the viscosity is less than 23S.
3. The sleeve connection method of the u-shaped totally-enclosed geothermal communication well according to claim 1, wherein the sleeve connection method comprises the following steps: in the step S3, the reaming must be repeated several times in the section easy to incline so as to ensure the rounding of the well bore.
4. The sleeve connection method of the u-shaped totally-enclosed geothermal communication well according to claim 1, wherein the sleeve connection method comprises the following steps: the accumulated length of the well pipe recorded in the step S5 is consistent with the actual well depth, and the error is not more than 1m.
5. The sleeve connection method of the u-shaped totally-enclosed geothermal communication well according to claim 1, wherein the sleeve connection method comprises the following steps: and step S10, clean water or slurry is pumped into the hole through the drill rod, the clean water or slurry enters the sleeve and hole wall clearance through the slurry return hole and is pumped into the hole, and the water-cement ratio of the slurry is 0.5 and the specific gravity is 1.85.
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| CN202210680978.1A CN114991750B (en) | 2022-06-16 | 2022-06-16 | Casing pipe connection method of U-shaped totally-enclosed geothermal communication well |
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| CN116295950A (en) * | 2023-02-24 | 2023-06-23 | 山东省地质矿产勘查开发局八〇一水文地质工程地质大队(山东省地矿工程勘察院) | Geothermal field heat recycling equipment, geothermal field heat recycling method and application |
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| CN103104196A (en) * | 2013-02-06 | 2013-05-15 | 河南豫中地质勘察工程公司 | Large-diameter engineering well casing running method |
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