CN108266175B - Deep geothermal resource utilization well pattern system in residential district and use method thereof - Google Patents
Deep geothermal resource utilization well pattern system in residential district and use method thereof Download PDFInfo
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- CN108266175B CN108266175B CN201810266851.9A CN201810266851A CN108266175B CN 108266175 B CN108266175 B CN 108266175B CN 201810266851 A CN201810266851 A CN 201810266851A CN 108266175 B CN108266175 B CN 108266175B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 119
- 239000007924 injection Substances 0.000 claims abstract description 119
- 238000012544 monitoring process Methods 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 44
- 239000003673 groundwater Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 29
- 238000000746 purification Methods 0.000 claims abstract description 14
- 239000000700 radioactive tracer Substances 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 230000000155 isotopic effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002349 well water 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Geophysics (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a deep geothermal resource utilization well pattern in a residential district, and belongs to the technical field of drilling engineering. A deep geothermal resource utilization well pattern system in residential district and its application method, including upstream monitoring well, injection well group and downstream monitoring well set sequentially along groundwater flow direction; the upstream monitoring well is a discharge well and is positioned at the upstream of the underground water flow direction; the downstream monitoring well comprises 2 wells, 1 is an injection well, 1 is a discharge well and is positioned downstream in the groundwater flow direction; the injection well groups are positioned between the upstream monitoring well and the downstream monitoring well and comprise n groups of injection wells and injection and production discharge wells which are in one-to-one correspondence, wherein n is more than or equal to 3 and less than or equal to 9; wherein the discharge wells are all straight wells; the device also comprises a heat exchange unit and a purification unit; the exhaust well is connected with the heat exchange unit, one end of the heat exchange unit is connected with the injection well through the connection purification unit, and the other end of the heat exchange unit is directly connected with an external user water system. The invention effectively protects the underground water resource.
Description
Technical Field
The invention relates to a deep geothermal resource utilization well pattern in a residential district, and belongs to the technical field of drilling engineering.
Background
The geothermal energy is a green low-carbon renewable energy source capable of being recycled, has the characteristics of large reserve, wide distribution, cleanness, environment friendliness, stability, reliability and the like, and is a clean energy source which is practical and feasible and has competitiveness. The existing medium-deep geothermal resource well generally only adopts groundwater in a stratum fracture layer, and after the groundwater is taken, the ground settlement, the surface water treatment and other complex problems can be caused, if the produced groundwater is reinjected, the ground pump pressure is high, and the groundwater pollution is easy to cause. The existing geothermal well exploitation technology is generally vertical well single well concentric pipe column injection exploitation, the water yield is small, the heat exchange efficiency is low, the water yield is large by adopting a horizontal well communication mode, but the corresponding technology is complex, and the cost is high.
Disclosure of Invention
The invention aims at solving the problems and provides a system for efficiently utilizing medium-deep geothermal resources by reasonably arranging a well pattern underground in a residential district, controlling the output of underground water, optimizing the well structure of an injection well and a production well and enhancing the heat exchange efficiency of the injection well.
The technical scheme of the invention is as follows:
A deep geothermal resource utilization well pattern system in a residential community comprises an upstream monitoring well, an injection well group and a downstream monitoring well which are sequentially arranged along the groundwater flow direction; wherein,
The upstream monitoring well is a discharge well and is positioned upstream of the underground water in the flowing direction;
the downstream monitoring well comprises 2 wells, 1 is an injection well, 1 is a discharge well and is positioned downstream in the groundwater flow direction;
The injection well groups are positioned between the upstream monitoring well and the downstream monitoring well and comprise n groups of injection wells and injection and production discharge wells which are in one-to-one correspondence, wherein n is more than or equal to 3 and less than or equal to 9;
Wherein the discharge wells are all straight wells;
The device also comprises a heat exchange unit and a purification unit; the exhaust well is connected with the heat exchange unit, one end of the heat exchange unit is connected with the purification unit and then connected with the injection well through the connection, and the other end of the heat exchange unit is directly connected with an external user water system;
wherein, the upstream monitoring well and the downstream monitoring well adopt an early open hole completion, the technical casing is put into the underground aquifer, and the injection well and the discharge well adopt casing perforation completion; the injection and production well group adopts directional perforation in the same depth and opposite directions in the underground aquifer, synchronously performs directional fracturing, passes through stratum among wells to form a fluid channel, and after the injection and production well group drills through the aquifer, the injection and production well group drills 30 meters, and is reserved as a sand setting pocket.
The injection well in the downstream monitoring well is an injection vertical well, and the injection well in the injection production well group is an injection directional well.
The well spacing of any two wells in the upstream monitoring well, the injection and production well group and the downstream monitoring well is more than or equal to 50m.
The injection directional well is a five-section well system and comprises a straight-increasing-stabilizing-decreasing-straight five-section system section.
The application method of the deep geothermal resource utilization well pattern system in the residential district uses the deep geothermal resource utilization well pattern system in the residential district, and the implementation process is as follows:
(1) Monitoring well heat exchange: the method comprises the steps that the heat-containing underground water in an underground water-bearing layer is discharged from an upstream monitoring well and a downstream monitoring well through a drainage pipeline, heat exchange is carried out through a heat exchange unit, the heat-containing underground water after heat exchange is sent to an external user water system through an external pipeline for use by users, on the other hand, the heat-containing underground water after heat exchange is purified through a purification unit and then is injected into the underground water-bearing layer, heat exchange of the monitoring well is achieved, and the heat-containing underground water discharged from the upstream monitoring well and the heat-containing underground water again injected into the underground water-bearing layer are detected in temperature, flow and water quality;
(2) Heat exchange by filling and discharging wells: the method comprises the steps that a drainage well in an injection well group is used for draining heat-containing underground water in an underground aquifer through a drainage pipeline, heat exchange is carried out through a heat exchange unit, the heat-containing underground water after heat exchange is sent to an external user water system through an external transmission pipeline for users to use, on the other hand, the heat-containing underground water after heat exchange is purified through a purification unit and then is injected into the underground aquifer, and a tracer is added during injection, so that heat exchange of the injection well and the drainage well is realized;
(3) Judging whether the wave and range of the hot groundwater of the injection well and the drainage well are controlled according to the flowing direction of the tracer agent, and taking corresponding measures.
The specific process for judging whether the heat-containing underground water wave and the range of the injection well and the drainage well are controlled according to the flow direction of the tracer is as follows: when the drainage pipeline of the upstream monitoring well or the drainage well of the downstream monitoring well detects that the tracer exists, the underground water wave and the range of the injection well and the drainage well are enlarged, the drainage amount of the drainage well in the injection well group is increased, the injection water amount of the injection well in the injection well group is correspondingly reduced, and when the drainage pipeline of the drainage well of the downstream monitoring well detects that the tracer does not exist, the underground water wave and the range of the injection well and the drainage well are controlled; when the drainage line of the drainage well of the upstream monitoring well or the downstream monitoring well detects that the tracer is still present, the control is unfavorable, and in order to prevent the underground water from being polluted, the position of the injection well of the downstream monitoring well is changed from the drainage well to the injection well by adjusting the upstream monitoring well.
The invention has the technical effects that:
1. the well pattern and well pattern implementation structure is simple, the construction process is mature, and the cost is low;
2. The underground water recycling system is used for recycling underground water taken from the injection and extraction area and monitoring the underground water, so that underground water resources are effectively protected.
Drawings
Fig. 1 is a schematic diagram of a deep geothermal resource utilization pattern in a residential community according to the present invention.
Fig. 2 is a flow chart of heat exchange well group and geothermal utilization of deep geothermal resource utilization well pattern in residential district according to the present invention.
Wherein 1 is a drainage pipeline; 2 is a heat exchange unit; 3 is a purifying unit; 4 is an injection line; 5 is a supplementary water source; 6 is a tracer; 7 is an output pipeline, 8-an external user water system; the well A is an injection directional well (comprising 2-1A, 2-2A and 2-3A); b is an injection production drainage well (comprising 2-1B, 2-2B and 2-3B); 1-1 is an upstream monitoring well; well C is a downstream monitoring well (including 3-1C, 3-2C).
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1 and 2, a deep geothermal resource utilization well pattern system in a residential district includes an upstream monitoring well 1-1, an injection well group and a downstream monitoring well C which are sequentially arranged along the groundwater flow direction; wherein, the upstream monitoring well 1-1 is a discharge well and is positioned upstream of the groundwater flow direction; the downstream monitoring well C comprises 2 wells, 1 is an injection well, 1 is a discharge well and is positioned downstream in the groundwater flow direction; the injection and production well group is positioned between the upstream monitoring well 1-1 and the downstream monitoring well C and comprises 3 groups of injection directional wells A and injection and production discharge wells B which are in one-to-one correspondence; wherein the discharge wells are all straight wells; the injection directional well A is a five-section well system and comprises a straight-increasing-stabilizing-decreasing-straight five-section system section. The well spacing of any two wells in the upstream monitoring well 1-1, the injection and production well group and the downstream monitoring well C is more than or equal to 50m. The device also comprises a heat exchange unit 2 and a purification unit 3; the exhaust well is connected with the heat exchange unit 2, one end of the heat exchange unit 2 is connected with the injection well through the connection purification unit 3, and the other end of the heat exchange unit 2 is directly connected with the external user water system 8.
Wherein, the upstream monitoring well 1-1 and the downstream monitoring well C adopt an early open hole completion, a technical sleeve is put into an underground water-bearing layer, and an injection well and a discharge well adopt sleeve perforation completion; the injection and production well group adopts directional perforation in the same depth and opposite directions in the underground aquifer, synchronously performs directional fracturing, passes through stratum among wells to form a fluid channel, and after the injection and production well group drills through the aquifer, the injection and production well group drills 30 meters, and is reserved as a sand setting pocket. The injection well in the downstream monitoring well C is an injection vertical well, and the injection well in the injection production well group is an injection directional well A.
The upstream monitoring well 1-1, the injection and production well group and the downstream monitoring well C are arranged in parallel along the groundwater flow direction. The upstream monitoring well 1-1 is a discharge well, is injected into the directional well number well 50m from the distance of 2-1A, forms a hydraulic funnel on the upstream of underground water, and monitors the change of discharged water quality in real time.
The distance between the 3-1C downstream monitoring well and the 2-2B injection production drainage well is 50 meters, and the distance between the 3-1C downstream monitoring well and the 3-2C downstream monitoring well is 50 meters. The 3-1C downstream monitoring well is a discharge well, a hydraulic funnel is formed at the underground downstream, and the change of the discharged water quality is monitored in real time. The 3-2C downstream monitoring well is an injection well, and groundwater discharged by the upstream monitoring well 1-1 after heat exchange is injected.
The 2-1A injection directional well, the 2-2A injection directional well and the 2-3A injection directional well are in one-to-one correspondence with the 2-1B injection and production discharge well, the 2-2B injection and production discharge well and the 2-3B injection and production discharge well, the inter-well distance is 50 meters, an injection and production well group is formed, and the injection and production well group is drilled 30 meters after penetrating through an aquifer and is reserved as a sand setting pocket. The injection well group adopts directional perforation in the same depth and opposite directions in the water-bearing stratum, and synchronously performs directional fracturing, so that stratum among the wells is communicated, and a fluid channel is formed.
The 2-2A injection directional well is added with the tracer 6 while injecting fluid, and the tracer 6 can be chemical, isotopic, fluorescent and magnetic substances, so that the selected tracer 6 has no pollution to the underground water body.
The application method of the deep geothermal resource utilization well pattern system in the residential district uses the deep geothermal resource utilization well pattern system in the residential district, and the implementation process is as follows:
(1) Monitoring well heat exchange: the upstream monitoring wells 1-1 and 3-1C downstream monitoring wells discharge the hot groundwater in the underground aquifer through the drainage pipeline 1, exchange heat through the heat exchange unit 2, the heat exchanged hot groundwater is sent to the external user water system 8 through the external pipeline 7 for users to use, on the other hand, the heat exchanged hot groundwater is purified through the purification unit 3 and then injected into the underground aquifer through the injection pipeline 4, so as to realize the heat exchange of the monitoring wells, and the temperature, flow and water quality detection is carried out on the hot groundwater discharged by the upstream monitoring well 1-1 and the hot groundwater which is injected into the underground aquifer again;
(2) Heat exchange by filling and discharging wells: the injection and production drainage well B is used for draining the hot groundwater in the underground aquifer through the drainage pipeline 1, exchanging heat through the heat exchange unit 2, sending the hot groundwater after heat exchange to the external user water system 8 for users through the external transmission pipeline 7, on the other hand, purifying the hot groundwater after heat exchange through the purification unit 3, injecting the hot groundwater into the underground aquifer through the injection pipeline 4, adding the tracer 6 during injection, monitoring the injection and production wave and range of the groundwater, and supplementing the injection water quantity of the injection directional well A through the supplementing water source 5 according to the water quantity; realize the heat exchange of the injection well and the drainage well.
(3) Judging whether the wave and range of the hot groundwater of the injection well and the drainage well are controlled according to the flow direction of the tracer 6, and taking corresponding measures.
The specific process for judging whether the heat-containing groundwater wave and the scope of the injection well and the drainage well are controlled according to the flow direction of the tracer 6 is as follows: when the drainage pipeline 1 of the upstream monitoring well 1-1 or 3-1C downstream monitoring well detects that the tracer 6 exists, the underground water wave and range of the injection well and the drainage well are expanded, the drainage amount of the injection well B is increased, the injection water amount of the injection well A injected into the directional well A in the injection well group is correspondingly reduced, and when the drainage pipeline 1 of the upstream monitoring well 1-1 or 3-1C downstream monitoring well detects that the tracer 6 does not exist, the underground water wave and range of the injection well and the drainage well are controlled; when the drainage line 1 of the upstream monitoring well 1-1 or the 3-1C downstream monitoring well detects that the tracer 6 still exists, the control is unfavorable, in order to prevent the underground water from being polluted, the upstream monitoring well 1-1 is adjusted to be changed from the drainage well to the injection well, or the injection well and the drainage well of the downstream monitoring well C are in the position change, namely the 3-1C downstream monitoring well is adjusted to be the injection well, and the 3-2C downstream monitoring well is adjusted to be the drainage well.
Claims (3)
1. A method of using a deep geothermal resource utilization pattern system in a residential quarter, the method using a deep geothermal resource utilization pattern system in a residential quarter, the deep geothermal resource utilization pattern system in a residential quarter comprising an upstream monitoring well (1-1), a production-injection well group and a downstream monitoring well (C) arranged in sequence along a groundwater flow direction; wherein,
The upstream monitoring well (1-1) is a discharge well and is positioned upstream of the underground water flowing direction;
the downstream monitoring well (C) comprises 2 wells, 1 is an injection well, 1 is a discharge well and is positioned downstream in the groundwater flow direction;
The injection well groups are positioned between the upstream monitoring well (1-1) and the downstream monitoring well (C) and comprise n groups of injection wells and discharge wells which are in one-to-one correspondence, wherein n is more than or equal to 3 and less than or equal to 9; wherein the discharge wells are all straight wells;
The deep geothermal resource utilization well pattern system in the residential community further comprises a heat exchange unit (2) and a purification unit (3); the exhaust well is connected with the heat exchange unit (2), one end of the heat exchange unit (2) is connected with the injection well through the connection purification unit (3), and the other end of the heat exchange unit (2) is directly connected with the external user water system (8);
Wherein, the upstream monitoring well (1-1) and the downstream monitoring well (C) adopt an early open hole well completion, a technical sleeve is put into an underground aquifer, and an injection well and a discharge well adopt sleeve perforation well completion; the injection and production well group adopts directional perforation in the same depth and opposite directions in the underground aquifer, synchronously performs directional fracturing, passes through stratum among wells, forms a fluid channel, and drills 30 meters after penetrating through the aquifer, and is reserved as a sand setting pocket;
The injection well in the downstream monitoring well (C) is an injection vertical well, and the injection well in the injection production well group is an injection directional well (A); the injection directional well (A) is a five-section well system and comprises a straight-increasing-stabilizing-decreasing-straight five-section system section;
the implementation process of the using method is as follows:
(1) Monitoring well heat exchange: the heat-containing underground water in the underground aquifer is discharged from the discharge well in the upstream monitoring well (1-1) and the downstream monitoring well (C) through the discharge pipeline (1), the heat is exchanged at the heat exchange unit (2), the heat-containing underground water after the heat exchange is sent to the external user water system (8) through the external pipeline (7) for the user to use, on the other hand, the heat-containing underground water after the heat exchange is purified by the purification unit (3) and then is injected into the underground aquifer, so as to realize the heat exchange of the monitoring well, and the temperature, flow and water quality detection is carried out on the heat-containing underground water discharged from the upstream monitoring well (1-1) and the heat-containing underground water again injected into the underground aquifer;
(2) Heat exchange by filling and discharging wells: the drainage well in the injection and production well group is used for draining the heat-containing underground water in the underground aquifer through the drainage pipeline (1), the heat exchange is carried out at the heat exchange unit (2), the heat-containing underground water after the heat exchange is sent to the external user water system (8) through the external transmission pipeline (7) for users to use, on the other hand, the heat-containing underground water after the heat exchange is purified by the purification unit (3) and then is injected into the underground aquifer, and the tracer (6) is added during the injection, so that the heat exchange of the injection and the drainage well is realized;
(3) Judging whether the wave and range of the hot groundwater of the injection well and the drainage well are controlled according to the flow direction of the tracer (6), and taking corresponding measures.
2. The method of use according to claim 1, wherein: the well spacing of any two wells in the upstream monitoring well (1-1), the injection and production well group and the downstream monitoring well (C) is more than or equal to 50m.
3. The method of use according to claim 1, wherein: the specific process for judging whether the heat-containing underground water wave and the range of the injection well and the drainage well are controlled according to the flow direction of the tracer (6) is as follows: when the drainage pipeline (1) of the drainage well of the upstream monitoring well (1-1) or the drainage well of the downstream monitoring well (C) detects that the tracer (6) exists, the groundwater wave and the range of the injection well and the drainage well are enlarged, the drainage volume of the drainage well in the injection well group is increased, the injection water volume of the injection well in the injection well group is correspondingly reduced, and when the drainage pipeline (1) of the drainage well of the upstream monitoring well (1-1) or the drainage pipeline (1) of the drainage well of the downstream monitoring well (C) detects that the tracer (6) does not exist, the groundwater wave and the range of the injection well and the drainage well are controlled; when the drainage line (1) of the drainage well of the upstream monitoring well (1-1) or the drainage well of the downstream monitoring well (C) detects that the tracer (6) still exists, the control is unfavorable, and in order to prevent the underground water from being polluted, the position of the injection well of the downstream monitoring well (C) is changed from the drainage well to the injection well by adjusting the upstream monitoring well (1-1).
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| 井间示踪剂监测技术在江汉油区的应用;李明;;江汉石油职工大学学报;20090720(第04期);第45-48页 * |
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