CN113565467B - Umbrella-shaped geothermal well descaling device and descaling method thereof - Google Patents
Umbrella-shaped geothermal well descaling device and descaling method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 105
- 239000007924 injection Substances 0.000 claims abstract description 105
- 239000003814 drug Substances 0.000 claims abstract description 96
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 56
- 239000011575 calcium Substances 0.000 claims abstract description 56
- 239000000126 substance Substances 0.000 claims abstract description 32
- 238000000605 extraction Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 23
- 239000004744 fabric Substances 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 8
- 239000000178 monomer Substances 0.000 claims description 70
- 229940079593 drug Drugs 0.000 claims description 31
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000009417 prefabrication Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009513 drug distribution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
- E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal
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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
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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- 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
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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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Abstract
The invention relates to an umbrella-shaped geothermal well descaling device and a descaling method thereof, belonging to the field of geothermal energy development. The umbrella-shaped geothermal well descaling device mainly comprises three parts: the underground descaling system mainly comprises a framework, high-strength water permeable cloth, a spring mechanism and a replaceable cutter head; the pipeline system comprises a hollow drill rod, a main medicine injection pipeline, a branch medicine injection pipeline and a drainage channel consisting of an annular gap between the medicine injection pipeline and the hollow drill rod; the ground auxiliary system comprises a drilling machine, a medicine injection pump, a pumping pump and a filtering device. The invention combines the chemical descaling method with the mechanical descaling method, improves the calcium scale removal efficiency, adopts the organic combination of the umbrella-shaped structure and the extraction channel to realize extraction of the calcium scale slag, avoids well section blockage caused by free deposition of the calcium scale, and has higher practical value and economic benefit.
Description
Technical Field
The invention belongs to the technical field of geothermal energy development, and particularly relates to an umbrella-shaped geothermal well descaling device and a descaling method thereof.
Background
Geothermal energy is a clean energy source with extremely large reserve and wide distribution range, and has very high utilization value. The geothermal resource of the dry hot rock is one of geothermal resources, and compared with the geothermal resource of the water heat type, the geothermal resource of the dry hot rock is more stable, has higher temperature and is more suitable for realizing the design of stable power generation. But has the defects of large burial depth, and the current main development means is to drill a production well and an injection well at a certain distance and manufacture an artificial thermal reservoir by means of hydraulic fracturing and the like. Cold water injected from the injection well is heated by the thermal reservoir, and then high-temperature water and water vapor can be produced in the production well for power generation and heating.
In the geothermal energy extraction process, the well wall is extremely easy to produce calcium scale, and the principle of calcium scale production of the well wall is as follows: the pressure of the geothermal fluid is rapidly reduced when the geothermal fluid rises to the vicinity of the wellhead of the production well, flash evaporation occurs, and CO dissolved in the fluid 2 Rapidly released into the air, ca in the fluid 2+ Concentration and CO 3 2- The product of the concentrations is greater than CaCO 3 The solubility product of (2) is such that CaCO 3 The calcium scale is precipitated from the fluid and is adhered to the well wall to form calcium scale, and the principle analysis shows that the depth of the calcium scale is generally within the range of 100m downwards from the well mouth.
The large amount of calcium scale attached to the surface of the well wall can reduce the diameter of the well shaft of the production well, so that the temperature of high-temperature water is reduced, the flow is reduced, and the production well is blocked or even scrapped. The current conventional method for removing calcium scale from the well wall is to inject chemical drugs into the production well or to remove the scale by adopting a physical method. However, because the position where the calcium scale is generated is located far from the ground surface, the efficiency of removing the deep calcium scale by adopting a mechanical descaling method is low, and the calcium scale removed from the inner wall of the production well can continue to deposit downwards, so that the well section of the production well can be blocked. Meanwhile, as the generation position of the calcium scale is far away from the ground surface, when the scale is removed by adopting a chemical drug injection method, the uniformity of drug distribution is largely uncontrolled, and the dosage of the injected drug is increased, so that the additional economic cost is increased. It is therefore an urgent need to find a geothermal well calcium scale removal device and method that can quickly complete the geothermal well descaling operation without causing blockage of the well section.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problem of mechanical descaling in a geothermal well, the invention provides an umbrella-shaped geothermal well descaling device and a descaling method thereof.
The invention is realized by the following technical scheme.
An umbrella-shaped geothermal well descaling device comprises a downhole descaling system, a pipeline system and a ground auxiliary system, wherein:
the pipeline system comprises a hollow drill rod, a main medicine injection pipeline, a branch medicine injection pipeline, a pumping channel, a lower annular joint and an upper annular joint, wherein the open position of the upper end of the hollow drill rod is movably connected with a closed end through the upper annular joint, a plurality of pumping holes are formed in the lower end face of the hollow drill rod so as to realize the communication between the pumping channel and a geothermal well, and the lower annular joint is arranged below the hollow drill rod; the main medicine injection pipeline sequentially penetrates through the closed end and the hollow drill rod from top to bottom, the axial direction of the main medicine injection pipeline is collinear with the axial direction of the hollow drill rod, the main medicine injection pipeline is fixedly connected with the closed end, the main medicine injection pipeline and the closed end are kept static when the hollow drill rod rotates, the main medicine injection pipeline outside the hollow drill rod is communicated with the lower annular joint, and an annular gap part between the main medicine injection pipeline and the hollow drill rod is set as a drainage channel;
the underground descaling system comprises a framework, a spring mechanism, high-strength water permeable cloth and cutter heads, wherein the framework is made of high-strength steel, a plurality of frameworks are uniformly distributed at the bottom of a hollow drill rod along the circumferential direction, the root of the framework is hinged with the bottom of the hollow drill rod, the framework is obliquely upwards arranged, the rotation of the hollow drill rod drives the framework to synchronously rotate, a medicine injection branch pipeline is arranged in the framework along the axial direction of the framework, the medicine injection branch pipeline is communicated with a medicine injection main pipeline through a lower annular joint, the integral sealing effect of the pipeline is ensured, and meanwhile, the relative rotation between the medicine injection main pipeline and the medicine injection branch pipeline is ensured; the tool bit is respectively arranged at the free end of the framework, the tool bit is connected with the framework in an assembling way, the tool bit is replaceable, the tool bit is provided with a chemical spraying hole, the chemical spraying hole is communicated with the chemical spraying branch pipeline, and when the chemical spraying pump is used for pumping chemical descaling chemicals into the chemical spraying main pipeline, the chemical chemicals can be sprayed upwards from the chemical spraying hole on the tool bit to the well wall; the fan-shaped areas between the adjacent frameworks are provided with high-strength water permeable cloth, the edges of the high-strength water permeable cloth are fixedly connected with the upper surfaces of the frameworks at the two sides, and when the frameworks are in a contracted state, the high-strength water permeable cloth is folded and contracted to a certain extent; when the framework is opened, the high-strength water permeable cloth is also opened, and the projection area of the high-strength water permeable cloth on the horizontal plane is basically the same as the area of the shaft. Therefore, the calcium scale peeled off from the well wall falls on the high-strength water permeable cloth, so that the subsequent extraction treatment is facilitated, and the phenomenon of blockage of the well section possibly caused by free sinking of the calcium scale is avoided. The spring mechanisms are respectively arranged between the hollow drill rod and the corresponding frameworks, the spring mechanisms drive the tool bit to always press the inner wall of the geothermal well through the frameworks, and the spring mechanisms can ensure that the frameworks and the high-strength water permeable cloth are fully opened after the umbrella-shaped geothermal well descaling device descends to a designated position in a shaft, so that the tool bit is clung to the well wall;
the ground auxiliary system comprises a drilling machine, a medicine injection pump, a pumping pump and a filtering device, wherein the drilling machine can grip the hollow drill rod, so that the drilling machine is tightly combined with the hollow drill rod, and the vertical movement and the power output of the pipeline system and the underground descaling system are realized. The hollow drill rod can be loosened, so that the hollow drill rod can move relatively to the drilling machine, and the extension of a pipeline system is realized. The injection pump is communicated with the upper end of the injection main pipeline through a pipeline, the extraction pump is communicated with the upper part of the extraction channel through a pipeline, a filter device is arranged on the pipeline communicated with the extraction channel, the extraction pump, the filter device and the extraction pipeline are connected, and the removed calcium scale can be extracted from the geothermal well and filtered.
Further, the length L of the skeleton is not less than the radius of the geothermal well.
Further, the cutting edge of the cutter head is obliquely upwards arranged, and a serrated notch is formed in the position of the cutting edge.
A descaling method of an umbrella-shaped geothermal well descaling device comprises the following steps:
s1, stopping production of the geothermal well, determining the maximum depth H of a calcium scale generation area of a well wall in the geothermal well by adopting a logging camera, manufacturing a pipeline system according to the maximum depth H, enabling the lengths of a hollow drill rod, a drainage channel and a drug injection main pipeline in the pipeline system to be not less than 1.2 times of H, equally dividing the hollow drill rod and the drug injection main pipeline into N sections according to practical conditions, and carrying out pipe section prefabrication on a hollow drill rod monomer and a drug injection main pipeline monomer according to the length of each section of 1.2H/N, wherein the length of 10m is less than or equal to 1.2H/N is less than or equal to 20m, a threaded interface is reserved at the joint of each adjacent hollow drill rod monomer, and a threaded interface is reserved at the joint of each adjacent drug injection main pipeline monomer;
s2, firstly, hinging a framework to the lower part of a first section of hollow drill rod monomer, and communicating the first section of main injection pipeline monomer with the main injection pipeline; then, the drilling machine grips the first section of hollow drill rod monomer to ensure that the central shaft of the first section of hollow drill rod monomer, the central shaft of the underground descaling system and the central shaft of the geothermal well are collinear; finally, the drilling machine grips the first section of hollow drill rod monomer and moves downwards, so that the first section of hollow drill rod monomer, the first section of main medicine injection pipeline monomer and the underground descaling system enter a geothermal well from a wellhead;
s3, hoisting a main medicine injection pipeline and a hollow drill rod:
A. hoisting the prefabricated second-section main drug injection pipeline monomer in the step S1 to the upper part of the first-section main drug injection pipeline monomer, wherein the second-section main drug injection pipeline monomer is in threaded connection with the first-section main drug injection pipeline monomer through a threaded interface, and sealing the joint position;
B. hoisting the prefabricated second section hollow drill rod monomer in the step S1 above the first section hollow drill rod monomer, connecting the second section hollow drill rod monomer with the first section hollow drill rod monomer through a threaded interface in a threaded manner, and sealing the joint position; then, the drilling machine loosens the first section of hollow drill rod monomer, then moves upwards, grips the second section of hollow drill rod monomer, and drives the underground descaling system to move downwards;
C. the steps A-B are sequentially and repeatedly executed, the rest main drug injection pipeline monomer and the hollow drill rod monomer are sequentially connected end to end, the preparation of a pipeline system is completed, and meanwhile, the underground descaling system and the pipeline system are moved to a preset position;
s4, in the step S3, in the process that the underground descaling system and the pipeline system gradually descend in the geothermal well: firstly, when the underground descaling device just starts to enter a geothermal well, the cutting tool bit is clung to the well wall to descend; then, the cutting tool bit descends into a calcium scale generation area, and the calcium scale is retracted to the inner side through a compression framework compression spring mechanism; finally, the tool bit passes through the calcium scale generation area, the spring mechanism is reset to drive the framework and the high-strength permeable cloth to be outwards opened to restore to the initial state, the tool bit is clinged to the well wall again, and the underground scale removal system reaches a preset position;
s5, completing connection of the injection pump, the extraction pump, the filtering device, the closed end and the pipeline system, preparing chemical descaling agents on the ground in advance, and starting a ground auxiliary system; firstly, a chemical descaling agent is pumped into a chemical injection main pipeline by a chemical injection pump, moves along a chemical injection branch pipeline and is sprayed to a calcium scale generating area of a well wall from a chemical spraying hole; then, the drilling machine drives the underground descaling system to rotate and ascend through the hollow drill rod, the cutter head cuts and eliminates calcium scale at the position of the calcium scale generating area along the well wall in the process of rotating and ascending, meanwhile, the extraction pump is started, the cut calcium scale slag is upwards discharged out of the well shaft along the extraction channel under the action of the extraction pump, the calcium scale slag is filtered by the filtering device and then subjected to harmless treatment, and tail water is refilled into the geothermal well;
s6, lifting the underground descaling system to be separated from the geothermal well by the drilling machine through the hollow drill rod, completing the calcium scale removal operation, closing the ground auxiliary system, removing the umbrella-shaped geothermal well descaling device, and recovering the normal production of the geothermal well.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can improve the descaling speed of the geothermal well, improve the descaling effect of the geothermal well, and simultaneously can avoid the damage to the geothermal well shaft caused by the descaling by adopting a mechanical method to a great extent;
2. the invention can collect the calcium scale stripped from the well wall and discharge the calcium scale out of the geothermal well, thereby avoiding the effect that the stripped calcium scale is deposited downwards and even blocks part of the well section by adopting a common mechanical descaling method;
3. the invention has simple structure and can be suitable for the descaling work of geothermal wells with different sizes.
Drawings
FIG. 1 is a schematic top view of an umbrella geothermal well descaling apparatus;
FIG. 2 is a schematic view of the cross-sectional structure of the plane A-A of FIG. 1;
FIG. 3 is a schematic view of the cross-sectional structure of the B-B plane in FIG. 1;
FIG. 4 is a perspective view of a tool tip and skeleton assembly;
FIG. 5 is a schematic view of an opening in the bottom of a hollow drill pipe;
FIG. 6 is a schematic diagram of the connection of the lower annular fitting to the main and branch drug injection lines;
FIG. 7 is a schematic illustration of the connection of the upper annular fitting to the closed end and the core drill;
FIG. 8 is a flow chart of a process for using the umbrella geothermal well descaling apparatus;
in this application, all of the figures are schematic drawings which are intended to illustrate the principles of the invention only and are not drawn to scale.
In the figure, 200 is a pipeline system, 1 is a geothermal well, and 2 is a calcium scale generating region;
101 is a framework; 102 is a spring device; 103 is high-strength water permeable cloth; 104 is a cutter head; 105 is a medicine spraying hole;
201 is a hollow drill rod; 202 is a main medicine injection pipeline, 203 is a branch medicine injection pipeline; 204 is a drainage channel; 205 is a lower annular joint; 206 is an upper annular joint; 207 is a closed end, 208 is a extraction hole;
301 is a drilling machine; 302 is a drug infusion pump; 303 is a pump; 304 is a filtering device;
description of the embodiments
The following examples are illustrative of the invention and are not intended to limit the scope of the invention. Unless otherwise indicated, the examples were all under conventional experimental conditions.
An umbrella geothermal well descaling apparatus as shown in fig. 1 to 7, comprising a downhole descaling system, a pipe system and a surface auxiliary system, wherein:
the pipeline system 200 comprises a hollow drill rod 201, a main medicine injection pipeline 202, a branch medicine injection pipeline 203, a pumping channel 204, a lower annular joint 205 and an upper annular joint 206, wherein the open position of the upper end of the hollow drill rod 201 is movably connected with a closed end 207 through the upper annular joint 206, a plurality of pumping holes 208 are formed in the lower end face of the hollow drill rod 201, and the lower annular joint 205 is arranged below the hollow drill rod 201; the main medicine injection pipe 202 sequentially penetrates through the closed end 207 and the hollow drill pipe 201 from top to bottom, the axial direction of the main medicine injection pipe 202 is collinear with the axial direction of the hollow drill pipe 201, the main medicine injection pipe 202 is fixedly connected with the closed end 207, the main medicine injection pipe 202 and the closed end 207 are kept static when the hollow drill pipe 201 rotates, the main medicine injection pipe 202 outside the hollow drill pipe 201 is communicated with the lower annular joint 205, and an annular gap part between the main medicine injection pipe 202 and the hollow drill pipe 201 is set as a pumping channel 204;
the underground descaling system comprises a framework 101, a spring mechanism 102, high-strength water permeable cloth 103 and cutter heads 104, wherein a plurality of frameworks 101 are uniformly distributed at the bottom of a hollow drill rod 201 along the circumferential direction, the root of the framework 101 is hinged with the bottom of the hollow drill rod 201, the framework 101 is obliquely upwards arranged, a medicine injection branch pipeline 203 is arranged in the framework 101 along the axial direction of the framework, and the medicine injection branch pipeline 203 is communicated with a medicine injection main pipeline 202 through a lower annular joint 205; the tool bit 104 is respectively arranged at the free end of the framework 101, the tool bit 104 is provided with a medicine spraying hole 105, the medicine spraying hole 105 is communicated with a medicine injection branch pipeline 203, a sector area between adjacent frameworks 101 is provided with high-strength permeable cloth 103, the spring mechanism 102 is respectively arranged between the hollow drill rod 201 and the corresponding framework 101, and the spring mechanism 102 drives the tool bit 104 to always press the inner wall of the geothermal well 1 through the framework 101;
the ground auxiliary system comprises a drilling machine 301, a drug injection pump 302, a pumping pump 303 and a filtering device 304, wherein the drug injection pump 302 is communicated with the upper end of the drug injection main pipeline 202 through a pipeline, the pumping pump 303 is communicated with the upper part of the pumping channel 204 through a pipeline, and the filtering device 304 is arranged on the pipeline communicated with the pumping channel through the pumping pump 303.
Fig. 4 illustrates only one version of the tool bit 104, and any cutting tool bit that can effect the cutting of calcium scale while releasing chemical scale removal agents to the borehole wall is within the scope of the present invention.
Further, the length L of the skeleton 101 is not smaller than the radius of the geothermal well 1.
Further, the cutting edge of the cutter head 104 is arranged obliquely upwards, and a serrated notch is arranged at the position of the cutting edge.
The descaling method of the umbrella-shaped geothermal well descaling device shown in fig. 8 comprises the following steps:
s1, stopping production of the geothermal well 1, determining the maximum depth H of a calcium scale generation area 2 of a well wall in the geothermal well 1 by adopting a logging camera, manufacturing a pipeline system 200 according to the maximum depth H, enabling the lengths of a hollow drill rod 201, a pumping channel 204 and a drug injection main pipeline 202 in the pipeline system 200 to be not less than 1.2 times of H, equally dividing the hollow drill rod 201 and the drug injection main pipeline 202 into N sections according to actual conditions, and carrying out pipe section prefabrication on a hollow drill rod monomer and a drug injection main pipeline monomer according to the length of each section of 1.2H/N, wherein the length of 10m is less than or equal to 1.2H/N is less than or equal to 20m, a threaded interface is reserved at the joint of each adjacent hollow drill rod monomer, and a threaded interface is reserved at the joint of each adjacent drug injection main pipeline monomer;
s2, firstly, hinging a framework 101 to the lower part of a first section of hollow drill rod monomer, and communicating the first section of main injection pipeline monomer with the injection branch pipeline 203; then, the drilling machine 301 grips the first section of hollow drill rod monomer to ensure that the central axis of the first section of hollow drill rod monomer, the central axis of the underground descaling system and the central axis of the geothermal well 1 are collinear; finally, the drilling machine 301 grips the first section of hollow drill rod monomer and moves downwards, so that the first section of hollow drill rod monomer, the first section of main medicine injection pipeline monomer and the underground descaling system enter the geothermal well 1 from the wellhead;
s3, hoisting a main medicine injection pipeline and a hollow drill rod:
A. hoisting the prefabricated second-section main drug injection pipeline monomer in the step S1 to the upper part of the first-section main drug injection pipeline monomer, wherein the second-section main drug injection pipeline monomer is in threaded connection with the first-section main drug injection pipeline monomer through a threaded interface, and sealing the joint position;
B. hoisting the prefabricated second section hollow drill rod monomer in the step S1 above the first section hollow drill rod monomer, connecting the second section hollow drill rod monomer with the first section hollow drill rod monomer through a threaded interface in a threaded manner, and sealing the joint position; then, the drilling machine 301 loosens the first section of hollow drill rod monomer, then moves upwards, and grips the second section of hollow drill rod monomer, so that the second section of hollow drill rod monomer drives the underground descaling system to move downwards;
C. sequentially repeating the steps A-B, connecting the rest main drug injection pipeline monomer and the hollow drill rod monomer end to end in sequence, completing the preparation of the pipeline system 200, and simultaneously moving the underground descaling system and the pipeline system 200 to a preset position;
s4, in the step S3, in the process that the underground descaling system and the pipeline system 200 gradually descend in the geothermal well 1: firstly, when the underground descaling device just starts to enter the geothermal well 1, the cutting bit 104 is clung to the well wall to descend; then, the cutting bit 104 is lowered into the calcium scale generation zone 2, the calcium scale is compressed by the compression framework 101 and the spring mechanism 102, and the high-strength water permeable cloth 103 is retracted inwards; finally, the tool bit 104 passes through the calcium scale generation area 2, the spring mechanism 102 is reset to drive the framework 101 and the high-strength water permeable cloth 103 to be opened outwards to restore to an initial state, the tool bit 104 is clung to the well wall again, and the underground descaling system reaches a preset position;
s5, completing connection of the injection pump 302, the extraction pump 303, the filtering device 304, the closed end 207 and the pipeline system 200, preparing chemical descaling agents on the ground in advance, and starting a ground auxiliary system; first, the chemical descaling agent is pumped into the main chemical injection pipeline 202 by the chemical injection pump 302, moves along the branch chemical injection pipeline 203, and is sprayed out from the chemical spraying hole 105 to the calcium scale generating area 2 of the well wall; then, the drilling machine 301 drives the underground descaling system to rise in a rotating way through the hollow drill rod 201, the cutter head 104 cuts and eliminates calcium scale at the position of the calcium scale generation area 2 along the well wall in the rotating and rising process, meanwhile, the extraction pump 303 is started, the cut calcium scale slag is discharged upwards from the well shaft along the extraction channel 204 under the action of the extraction pump 303, the calcium scale slag is filtered by the filtering device 304 and is subjected to harmless treatment in a concentrated way, and tail water is refilled into the geothermal well 1;
s6, the drilling machine 301 lifts the underground descaling system to be separated from the geothermal well 1 through the hollow drill rod 201, calcium scale removal operation is completed, the ground auxiliary system is closed, the umbrella-shaped geothermal well descaling device is removed, and normal production of the geothermal well 1 is restored.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The umbrella-shaped geothermal well descaling device comprises an underground descaling system, a pipeline system and a ground auxiliary system, and is characterized in that:
the pipeline system (200) comprises a hollow drill rod (201), a main medicine injection pipeline (202), a branch medicine injection pipeline (203) and a pumping channel (204), a lower annular joint (205) and an upper annular joint (206), wherein the open position of the upper end of the hollow drill rod (201) is movably connected with a closed end (207) through the upper annular joint (206), a plurality of pumping holes (208) are formed in the lower end face of the hollow drill rod (201), and the lower annular joint (205) is arranged below the hollow drill rod (201); the main medicine injection pipeline (202) sequentially penetrates through the closed end head (207) and the hollow drill rod (201) from top to bottom, the axial direction of the main medicine injection pipeline (202) is collinear with the axial direction of the hollow drill rod (201), the main medicine injection pipeline (202) is fixedly connected with the closed end head (207), the main medicine injection pipeline (202) and the closed end head (207) are kept static when the hollow drill rod (201) rotates, the main medicine injection pipeline (202) in the hollow drill rod (201) is communicated with the lower annular joint (205), and an annular gap part between the main medicine injection pipeline (202) and the hollow drill rod (201) is provided with a drainage channel (204);
the underground descaling system comprises a framework (101), a spring mechanism (102), high-strength water permeable cloth (103) and cutter heads (104), wherein a plurality of frameworks (101) are uniformly distributed at the bottom of a hollow drill rod (201) along the circumferential direction, the root of the framework (101) is hinged with the bottom of the hollow drill rod (201), the framework (101) is obliquely upwards arranged, a medicine injection branch pipeline (203) is arranged in the framework (101) along the axial direction of the framework, and the medicine injection branch pipeline (203) is communicated with a medicine injection main pipeline (202) through a lower annular joint (205); the tool bit (104) is respectively arranged at the free end of the framework (101), the tool bit (104) is provided with a medicine spraying hole (105), the medicine spraying hole (105) is communicated with a medicine injection branch pipeline (203), a fan-shaped area between adjacent frameworks (101) is provided with high-strength permeable cloth (103), the spring mechanism (102) is respectively arranged between the hollow drill rod (201) and the corresponding framework (101), and the spring mechanism (102) drives the tool bit (104) to always press the inner wall of the geothermal well (1) through the framework (101);
the ground auxiliary system comprises a drilling machine (301), a medicine injection pump (302), a suction pump (303) and a filtering device (304), wherein the medicine injection pump (302) is communicated with the upper end of the medicine injection main pipeline (202) through a pipeline, the suction pump (303) is communicated with the upper part of the suction channel (204) through a pipeline, and the filtering device (304) is arranged on the pipeline, which is communicated with the suction channel, of the suction pump (303);
and in the process of rotating and rising along the well wall, the tool bit (104) cuts and eliminates the calcium scale at the position of the calcium scale generation area (2), and meanwhile, the extraction pump (303) is started, and the cut calcium scale slag is discharged upwards from the well shaft along the extraction channel (204) under the action of the extraction pump (303).
2. An umbrella geothermal well descaling apparatus according to claim 1, wherein: the length L of the skeleton (101) is not smaller than the radius of the geothermal well (1).
3. An umbrella geothermal well descaling apparatus according to claim 1, wherein: the cutting edge of the cutter head (104) is obliquely upwards arranged, and a serrated notch is arranged at the position of the cutting edge.
4. The descaling method of the umbrella-shaped geothermal well descaling device according to claim 1, comprising the steps of:
s1, stopping production of a geothermal well (1), determining the maximum depth H of a calcium scale generation area (2) of a well wall in the geothermal well (1) by adopting a logging camera, manufacturing a pipeline system (200) according to the maximum depth H, enabling the lengths of a hollow drill rod (201), a pumping channel (204) and a main medicine injection pipeline (202) in the pipeline system (200) to be not less than 1.2 times of H, equally dividing the hollow drill rod (201) and the main medicine injection pipeline (202) into N sections according to actual conditions, performing pipe section prefabrication on a hollow drill rod monomer and a main medicine injection pipeline monomer according to the length of each section of 1.2H/N, wherein the length of 10m is less than or equal to 1.2H/N is less than or equal to 20m, reserving a threaded interface at the joint of each adjacent hollow drill rod monomer, and reserving a threaded interface at the joint of each adjacent main medicine injection pipeline monomer;
s2, firstly, hinging a framework (101) to the lower part of a first section of hollow drill rod monomer, and communicating the first section of main medicine injection pipeline monomer with a medicine injection branch pipeline (203); then, the drilling machine (301) grips the first section of hollow drill rod monomer to ensure that the central axis of the first section of hollow drill rod monomer, the central axis of the underground descaling system and the central axis of the geothermal well (1) are collinear; finally, the drilling machine (301) grips the first section of hollow drill rod monomer and moves downwards, so that the first section of hollow drill rod monomer, the first section of main medicine injection pipe monomer and the underground descaling system enter the geothermal well (1) from the wellhead;
s3, hoisting a main medicine injection pipeline and a hollow drill rod:
A. hoisting the prefabricated second-section main drug injection pipeline monomer in the step S1 to the upper part of the first-section main drug injection pipeline monomer, wherein the second-section main drug injection pipeline monomer is in threaded connection with the first-section main drug injection pipeline monomer through a threaded interface, and sealing the joint position;
B. hoisting the prefabricated second section hollow drill rod monomer in the step S1 above the first section hollow drill rod monomer, connecting the second section hollow drill rod monomer with the first section hollow drill rod monomer through a threaded interface in a threaded manner, and sealing the joint position; then, the drilling machine (301) loosens the first section of hollow drill rod monomer, then moves upwards, grips the second section of hollow drill rod monomer, and drives the underground descaling system to move downwards;
C. sequentially and repeatedly executing the steps A-B, sequentially connecting the rest main drug injection pipeline monomer and the hollow drill rod monomer end to end, completing the preparation of the pipeline system (200), and simultaneously moving the underground descaling system and the pipeline system (200) to a preset position;
s4, in the step S3, in the process that the underground descaling system and the pipeline system (200) gradually descend in the geothermal well (1): firstly, when the underground descaling device just starts to enter the geothermal well (1), the cutting tool bit (104) is clung to the well wall to descend; then, the cutting bit (104) descends into the calcium scale generating area (2), and the calcium scale is compressed by the compression framework (101) through the compression spring mechanism (102), and the high-strength water permeable cloth (103) is retracted inwards; finally, the tool bit (104) passes through the calcium scale generation area (2), the spring mechanism (102) is reset to drive the framework (101) and the high-strength water permeable cloth (103) to be opened outwards to restore to an initial state, the tool bit (104) is attached to the well wall again, and the underground scale removal system reaches a preset position;
s5, completing connection of a medicine injection pump (302), a pumping pump (303), a filtering device (304), a closed end (207) and a pipeline system (200), preparing chemical descaling agents on the ground in advance, and starting a ground auxiliary system; firstly, a chemical descaling agent is pumped into a chemical descaling main pipeline (202) by a chemical descaling pump (302), moves along a chemical injection branch pipeline (203) and is sprayed out from a chemical spraying hole (105) to a calcium scale generating area (2) of a well wall; then, the drilling machine (301) drives the underground descaling system to rise in a rotating way through the hollow drill rod (201), the cutter head (104) cuts and eliminates calcium scale at the position of the calcium scale generation zone (2) in the process of rising along the well wall in a rotating way, meanwhile, the extraction pump (303) is started, the cut calcium scale slag is discharged out of the well shaft upwards along the extraction channel (204) under the action of the extraction pump (303), and the calcium scale slag is filtered by the filtering device (304) and then subjected to harmless treatment in a concentrated way, and tail water is refilled into the geothermal well (1);
s6, lifting the underground descaling system to leave the geothermal well (1) by the drilling machine (301) through the hollow drill rod (201), completing the calcium scale removal operation, closing the ground auxiliary system, removing the umbrella-shaped geothermal well descaling device, and recovering the normal production of the geothermal well (1).
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| CN115163007B (en) * | 2022-07-15 | 2023-10-17 | 黄河勘测规划设计研究院有限公司 | Integrated well wall repairing device and well wall water permeability repairing method |
| CN115846326A (en) * | 2022-12-26 | 2023-03-28 | 安徽迪诺环保新材料科技有限公司 | Device for removing metatitanic acid scale in hydrolysis kettle and using method thereof |
| CN117905461B (en) * | 2024-03-19 | 2024-06-18 | 山东宜美科节能服务有限责任公司 | Geothermal sampling device |
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