CN113585979A - High tower type geothermal production well and use method thereof - Google Patents
High tower type geothermal production well and use method thereof Download PDFInfo
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- CN113585979A CN113585979A CN202110748860.3A CN202110748860A CN113585979A CN 113585979 A CN113585979 A CN 113585979A CN 202110748860 A CN202110748860 A CN 202110748860A CN 113585979 A CN113585979 A CN 113585979A
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- shaft
- production well
- calcium scale
- inner shaft
- connecting assembly
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 47
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 45
- 239000012530 fluid Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 239000013043 chemical agent Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009513 drug distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- 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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a high tower type geothermal production well and a using method thereof, belonging to the field of geothermal energy development. The invention exposes the inner shaft by the movement of the outer protection structure under the assistance of the hoisting equipment, replaces the inner shaft with a replacement sleeve prepared in advance, closes the outer protection structure again after the replacement is finished, and can quickly recover the normal production. And after normal production is recovered, the calcium scale removing operation can be carried out on the well bore with the replaced inner wall attached with the calcium scale on the surface. The invention can greatly shorten the production stop time caused by descaling operation, simultaneously improve the effect and speed of removing calcium scale, and has high economic benefit.
Description
Technical Field
The invention belongs to the technical field of geothermal energy development, and particularly relates to a high tower type geothermal production well and a using method thereof.
Background
Geothermal energy is clean energy with great reserves and wide distribution range, and has very high utilization value. The hot dry rock geothermal resource is one of geothermal resources, and compared with a hydrothermal geothermal resource, the hot dry rock geothermal resource is more stable and higher in temperature, and is more suitable for realizing the design of stable power generation. But the defect is that the buried depth is large, and the current main development means is to drill a production well and an injection well according to a certain distance and manufacture an artificial heat reservoir by means of hydraulic fracturing and the like. After the cold water injected from the injection well is heated by the heat reservoir, high-temperature water and steam can be produced in the production well for power generation and heating.
The principle of calcium scale generation on well walls: when the geothermal fluid rises to the position near the wellhead of the production well, the pressure is rapidly reduced, the flash evaporation phenomenon occurs, and CO dissolved in the fluid2Quickly released into air and Ca in fluid2+Concentration and CO3 2-The product of the concentrations being greater than CaCO3Solubility product of (C) so that CaCO3Calcium scale is precipitated from the fluid and attached to the well wall to form calcium scale, and the depth of the calcium scale is generally within the range of 100m below the well head through principle analysis.
The large amount of calcium scale is attached to the surface of the well wall, so that the diameter of the well shaft of the production well is reduced, the temperature of high-temperature water is reduced, the flow is reduced, and the production well is blocked and even scrapped. The current conventional method for removing calcium scale from well walls is to inject chemicals into the production well or to remove the scale by physical methods. However, the position where the calcium scale is generated is far away from the earth surface, the descaling efficiency of removing the deep calcium scale by using the conventional mechanical descaling method is low, and meanwhile, if the conventional mechanical descaling method is used for descaling, production needs to be stopped, so the calcium scale removed from the inner wall of the production well continues to be deposited downwards, and a part of well sections of the production well can be blocked. Meanwhile, the generation position of the calcium scale is far away from the earth surface, when the scale is removed by adopting a method of injecting chemical drugs, the uniformity of drug distribution is largely uncontrolled, and the dosage of the injected drugs is increased to increase extra economic cost. Therefore, the method for solving the problems has great significance for ensuring the duration of geothermal power generation, stably extracting and utilizing geothermal resources and increasing the yield and the efficiency of geothermal power generation.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problem of descaling in a geothermal wellbore, the invention provides a high-tower geothermal production well and a using method thereof, wherein the calcium scale generation position is transferred to the ground surface, and the aim of simply and efficiently removing the calcium scale is fulfilled.
The design concept of the invention is as follows:
according to the principle of calcium scale formation, the main cause of calcium scale formation is dissolved CO in the fluid2When the pressure rises to the position near the wellhead of the production well, the pressure is rapidly reduced, when the pressure at a certain depth position in the production well is less than the critical pressure for generating the flash evaporation phenomenon, the flash evaporation phenomenon is generated, and the dissolved CO2Is rapidly released into the air when Ca in the fluid2+Concentration and CO3 2-The product of the concentrations being greater than CaCO3Solubility product of (C) so that CaCO3Is separated out from the fluid and adheres to the well wall to form calcium scale. Therefore, the design of the high tower type production well is adopted, the position of the wellhead of the production well is raised to a certain height from the original ground surface, the position (the calcium scale generation position) which is about to generate the flash evaporation phenomenon is transferred to the position above the ground surface from the position below the ground surface, and the quick and convenient descaling work is realized through the replaceable production well section above the ground surface.
The invention is realized by the following technical scheme.
A high tower geothermal production well comprising an inner wellbore, an outer protective structure, and a production well wellbore, wherein: the production well shaft is fixedly arranged in the geothermal production well below the ground surface, the upper end face of the production well shaft is fixedly provided with an annular connecting assembly, the inner well shaft is detachably arranged above the annular connecting assembly, the diameter and the function of the inner well shaft are the same as those of the production well shaft below the ground surface, and the inner well shaft is an extension of the original production well shaft above the ground surface; the external protection structure is in a circular truncated cone shape with a small upper diameter and a large lower diameter, is arranged outside the inner shaft and plays a role in maintaining the stability of the whole high-tower type geothermal production well, and comprises two symmetrically arranged half bodies, a mechanical sealing groove is arranged at the joint position of the two half bodies, and heat insulation layers are filled in the half bodies, so that the heat loss of high-temperature fluid in the production well caused by the increase of the height of the shaft can be reduced as much as possible; the ground surface is provided with a slide rail, the half bodies are arranged above the slide rail, and the two half bodies are closed or separated along the slide rail.
Further, the heights of the inner shaft and the outer protection structure are larger than the distance between the lowest position of the calcium scale generation area in the shaft of the production well and the ground surface, namely the height of the high tower type geothermal production well can be determined according to the original calcium scale generation position.
A use method of a high tower type geothermal production well comprises the following steps:
s1, stopping production of the production well, pumping high-temperature fluid in the inner shaft by using a water pump until the water level in the production well is reduced to be below the ground surface, and preparing an unused replacement shaft with the same shape and size as the inner shaft on the ground surface in advance for later use;
s2, hoisting the inner shaft by the hoisting equipment through the steel cable, keeping the steel cable in a tensioned state, keeping the inner shaft and the annular connecting assembly in a relatively static position without hoisting by the hoisting equipment, separating the two half bodies towards two sides along the slide rail respectively, and exposing the inner shaft to the upper part of the annular connecting assembly;
s3, removing the connecting assembly, lifting the inner shaft with a large amount of calcium scale attached to the inner wall from the annular connecting assembly by using lifting equipment, storing the inner shaft to a safe area, waiting for later descaling operation, lifting the replacement shaft prepared in the step S1 into the annular connecting assembly by using the lifting equipment, coaxially arranging the replacement shaft, the annular connecting assembly and the shaft of the production well, and fixing the connecting assembly again;
s4, the two half bodies are respectively closed inwards along the sliding rails, and the external protection structure holds the replacement shaft tightly; a brand new shaft prepared in advance is adopted to replace the inner shaft attached with a large amount of calcium scale in a short time, so that the operation of the geothermal system is recovered as soon as possible;
s5, recovering normal production of the production well, simultaneously carrying out calcium scale removal operation on the inner shaft stored in the safe area, and after the calcium scale removal operation is finished, uniformly coating chemical agents for preventing the generation and attachment of the calcium scale on the inner wall of the inner shaft for later use;
and S6, when the situation that the calcium scale is seriously adhered to the shaft is monitored, repeating the steps S1 to S5, and replacing the replacement shaft with a large amount of calcium scale adhered to the inner wall by the inner shaft renovated in the step S5.
Compared with the prior art, the invention has the beneficial effects that:
1. after the method is adopted, the construction environment of the descaling work is changed from below the earth surface to above the earth surface, so that great convenient conditions are provided for the descaling work, more detailed descaling operation can be performed, the descaling is more thorough, and the efficiency is higher;
2. by adopting the design of the replaceable shaft, normal production can be immediately recovered after the shaft is replaced, and the replaced shaft is descaled after the production is recovered.
Drawings
FIG. 1 is a schematic structural view of a high tower geothermal production well;
FIG. 2 is a schematic top view of a high tower geothermal production well;
FIG. 3 is a left side view schematic diagram of a high tower geothermal production well;
FIG. 4 is a schematic illustration of the location of calcium scale formation in the prior art;
FIG. 5 is a schematic illustration of the location of calcium scale formation after the use of the high tower geothermal production well of the present invention;
FIG. 6 is a schematic view of the assembly structure of the connecting assembly;
FIG. 7 is a flow chart of the present invention in use.
In the present application, all the figures are schematic drawings, which are only intended to illustrate the inventive principle and are not drawn to scale.
In the figure, 1 is a calcium scale attachment area, 2 is an inner shaft, 3 is an outer protection structure, 4 is a mechanical seal groove, 5 is a heat preservation and insulation layer, 6 is a production well shaft, 7 is an annular connecting assembly, 8 is a replacement shaft, 9 is a geothermal production well, and 10 is hoisting equipment.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions.
In this embodiment there is a hot dry rock geothermal power plant, with a conventional production well arrangement, the lowest point of calcium scale formation is found by monitoring to be 40m from the wellhead and the production well bore 6 below the surface to be 450mm in diameter.
From the above information it was determined that the geothermal production well 9 had a height H2 of 50m and that the diameter of the inner wellbore 2 was exactly the same as the diameter of the production well 6 below the surface, both 450 mm. In order to ensure the stability of the high tower type geothermal production well, the specific dimensions of the external protection structure 3 are designed as follows: the diameter of the top part is 1000mm, and the diameter of the bottom part is 2000 mm. And the space between the inner shaft 2 and the outer protective structure 3 is filled with a heat-insulating material with a thermal conductivity coefficient of 0.02W/(m DEG C).
A high tower geothermal production well as illustrated in figures 1 to 6 comprising an inner wellbore 2, an outer protective structure 3 and a production well wellbore 6, wherein: the production well shaft 6 is fixedly arranged in a geothermal production well 9 below the ground surface, an annular connecting assembly 7 is fixedly arranged at the position of the upper end face of the production well shaft 6, and the inner well shaft 2 is detachably arranged above the annular connecting assembly 7; the external protection structure 3 is in a circular truncated cone shape with a small upper diameter and a large lower diameter, the external protection structure 3 is arranged outside the internal shaft 2, the external protection structure 3 comprises two symmetrically arranged half bodies, a mechanical sealing groove 4 is arranged at the joint position of the two half bodies, and heat insulation layers 5 are filled in the half bodies; and paving a sliding rail on the ground surface perpendicular to two sides of the splicing surface by taking the joint position of the two half bodies as a center line, wherein the half bodies are arranged above the sliding rail, and the two half bodies are closed or separated along the sliding rail.
Further, the height of both the inner shaft 2 and the outer protective structure 3 is larger than the distance between the lowest position of the limescale deposit 1 in the shaft 6 of the production well and the surface.
A method of using a high tower geothermal production well, as shown in figure 7, comprising the steps of:
s1, stopping production of the production well, pumping high-temperature fluid in the inner shaft 2 by using a water pump until the water level in the production well is reduced to a position 10m below the ground surface, and preparing an unused replacement shaft 8 which has the same shape and size as the inner shaft 2 on the ground surface in advance for later use;
s2, hoisting the inner shaft 2 by the hoisting equipment 10 through the steel cable, keeping the steel cable in a tensioned state, not hoisting the hoisting equipment 10 by force, keeping the inner shaft 2 and the annular connecting assembly 7 in a relatively static position, separating the two half bodies to two sides by 800mm respectively along the slide rail, and exposing the inner shaft 2 to the upper part of the annular connecting assembly 7;
s3, removing the connecting assembly 7, hoisting equipment 10 lifts the inner shaft 2 with a large amount of calcium scale attached to the inner wall away from the annular connecting assembly 7, the inner shaft 2 is stored to a safe area to wait for later descaling operation, then the hoisting equipment 10 hoists the replacement shaft 8 prepared in the step S1 into the annular connecting assembly 7, the replacement shaft 8, the annular connecting assembly 7 and the production well shaft 6 are coaxially arranged, and the connecting assembly 7 is fixed again;
s4, the two half bodies are respectively closed inwards along the sliding rails, and the external protection structure 3 is tightly held to replace the shaft 8;
s5, recovering normal production of the production well, simultaneously carrying out calcium scale removal operation on the inner shaft 2 stored in the safe area, and after the calcium scale removal operation is finished, uniformly coating chemical agents for preventing the generation and attachment of the calcium scale on the inner wall of the inner shaft 2 for later use;
and S6, when the situation that the calcium scale is seriously adhered to the shaft 8 is monitored, repeating the steps S1 to S5, and replacing the replacement shaft 8 with a large amount of calcium scale adhered to the inner wall by the inner shaft 2 renovated in the step S5.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are 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 appended claims.
Claims (3)
1. A high tower geothermal production well comprising an inner wellbore (2), an outer protective structure (3) and a production well wellbore (6), characterized in that: the production well shaft (6) is fixedly arranged in a geothermal production well (9) below the ground surface, an annular connecting assembly (7) is fixedly arranged at the position of the upper end face of the production well shaft (6), and the inner well shaft (2) is detachably arranged above the annular connecting assembly (7); the external protection structure (3) is in a circular truncated cone shape with a small upper diameter and a large lower diameter, the external protection structure (3) is arranged outside the internal shaft (2), the external protection structure (3) comprises two symmetrically arranged half bodies, a mechanical sealing groove (4) is arranged at the joint of the two half bodies, and heat insulation layers (5) are filled in the half bodies; the ground surface is provided with a slide rail, the half bodies are arranged above the slide rail, and the two half bodies are closed or separated along the slide rail.
2. A high tower geothermal production well according to claim 1, wherein: the heights of the inner shaft (2) and the outer protection structure (3) are both larger than the distance between the lowest position of the calcium scale attachment area (1) in the shaft (6) of the production well and the ground surface.
3. The use method of the high tower geothermal production well according to claim 1, comprising the steps of:
s1, stopping production of the production well, pumping high-temperature fluid in the inner shaft (2) by using a water pump until the water level in the production well is reduced to be below the ground surface, and preparing an unused replacement shaft (8) which has the same shape and size as the inner shaft (2) on the ground surface in advance for later use;
s2, hoisting the inner shaft (2) by the hoisting equipment (10) through the steel cable, keeping the steel cable in a tensioned state, keeping the hoisting equipment (10) not to be hoisted by force, keeping the positions of the inner shaft (2) and the annular connecting component (7) relatively static, then separating the two half bodies towards two sides along the sliding rails respectively, and exposing the inner shaft (2) to the upper side of the annular connecting component (7);
s3, the connecting assembly (7) is released, the hoisting equipment (10) lifts the inner shaft (2) with a large amount of calcium scale attached to the inner wall away from the annular connecting assembly (7), the inner shaft (2) is stored to a safe area to wait for later descaling operation, then the hoisting equipment (10) hoists the replacement shaft (8) prepared in the step S1 into the annular connecting assembly (7), the replacement shaft (8), the annular connecting assembly (7) and the production well shaft (6) are coaxially arranged, and the connecting assembly (7) is fixed again;
s4, the two half bodies are respectively closed inwards along the sliding rails, and the external protection structure (3) holds the replacement shaft (8);
s5, the production well recovers normal production, meanwhile, calcium scale removing operation is carried out on the inner shaft (2) stored in the safe area, and after the calcium scale is removed, chemical agents for preventing the generation and attachment of the calcium scale are uniformly coated on the inner wall of the inner shaft (2) for later use;
and S6, when the situation that the calcium scale is seriously adhered to the shaft (8) is monitored, repeating the steps S1 to S5, and replacing the replacement shaft (8) with a large amount of calcium scale adhered to the inner wall by using the inner shaft (2) renovated in the step S5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110748860.3A CN113585979B (en) | 2021-07-02 | 2021-07-02 | High tower type geothermal production well and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110748860.3A CN113585979B (en) | 2021-07-02 | 2021-07-02 | High tower type geothermal production well and use method thereof |
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| Publication Number | Publication Date |
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| CN113585979A true CN113585979A (en) | 2021-11-02 |
| CN113585979B CN113585979B (en) | 2023-12-08 |
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-
2021
- 2021-07-02 CN CN202110748860.3A patent/CN113585979B/en active Active
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| CN113585979B (en) | 2023-12-08 |
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