CN108266175A - A kind of residential quarters mid-deep strata geothermal energy resources utilize well-pattern system and its application method - Google Patents

A kind of residential quarters mid-deep strata geothermal energy resources utilize well-pattern system and its application method Download PDF

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Publication number
CN108266175A
CN108266175A CN201810266851.9A CN201810266851A CN108266175A CN 108266175 A CN108266175 A CN 108266175A CN 201810266851 A CN201810266851 A CN 201810266851A CN 108266175 A CN108266175 A CN 108266175A
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well
injection
underground water
drainage
discharge
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CN108266175B (en
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杨全枝
张晓斌
马振锋
杨先伦
迟立宾
王红娟
韩金良
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Shaanxi Yanchang Petroleum Group Co Ltd
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Shaanxi Yanchang Petroleum Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/10Locating fluid leaks, intrusions or movements
    • E21B47/11Locating 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 present invention relates to a kind of residential quarters mid-deep strata geothermal energy resources using well pattern, belong to drilling engineering technical field.A kind of residential quarters mid-deep strata geothermal energy resources utilize well-pattern system and its application method, including monitored upstream well, injection-production well group and the monitored down well set gradually along direction of groundwater flow;Wherein, monitored upstream well is discharges well, the upstream in water flowing direction located underground;Monitored down well includes 2 mouthfuls of wells, and 1 mouthful is injection well, and 1 mouthful is is discharged well, the downstream in water flowing direction located underground;Injection-production well group adopts discharge well between monitored upstream well and monitored down well, including one-to-one n groups injection well and note, wherein 3≤n≤9;Wherein, discharge well is straight well;Further include heat-exchange unit and purification unit;The discharge well is connect with heat-exchange unit, and heat-exchange unit one end purifies unit by connection and connect again with injection well, and the heat-exchange unit other end is directly connect with external user water system.The effective protection groundwater resources of the present invention.

Description

Well pattern system for utilizing deep geothermal resources in residential community and using method thereof
Technical Field
The invention relates to a well pattern for utilizing geothermal resources in the middle and deep layers of a residential community, belonging to the technical field of drilling engineering.
Background
The geothermal energy is green, low-carbon and recyclable renewable energy, has the characteristics of large reserves, wide distribution, cleanness, environmental protection, stability, reliability and the like, and is practical, feasible and competitive clean energy. The existing middle-deep geothermal resource well generally only adopts underground water of a rock stratum fracture layer, complex problems of ground settlement, surface water treatment and the like can be caused after the underground water is taken out, and if the extracted underground water is reinjected, the ground pumping pressure is high, and the underground water pollution is easily caused. The existing geothermal well exploitation technology is generally vertical well single well concentric pipe column injection and exploitation, the water yield is small, the heat exchange efficiency is low, and although the water yield is large by adopting a horizontal well communication mode, the corresponding technology is complex and the cost is high.
Disclosure of Invention
The invention aims to solve the problems and provides a system for controlling the output of underground water, optimizing the well body structure of an injection and production well and enhancing the heat exchange efficiency of the injection and production well by reasonably arranging a well pattern underground in a residential district, thereby efficiently utilizing the geothermal resources in the middle and deep layers.
The technical scheme of the invention is as follows:
a well pattern system for utilizing geothermal resources in deep layers in residential districts comprises an upstream monitoring well, an injection and production well group and a downstream monitoring well which are sequentially arranged along the flow direction of underground water; wherein,
the upstream monitoring well is a discharge well and is positioned at the upstream of the flow direction of the underground water;
the downstream monitoring well comprises 2 wells, wherein 1 well is an injection well, and 1 well is a discharge well and is positioned at the downstream of the flow direction of the underground water;
the injection-production well group is positioned between the upstream monitoring well and the downstream monitoring well and comprises n groups of injection wells and injection-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 vertical wells;
the system also comprises a heat exchange unit and a purification unit; the discharge well is connected with a heat exchanger unit, one end of the heat exchanger unit is connected with the injection well through a connecting and purifying unit, and the other end of the heat exchanger unit is directly connected with an external user water system;
wherein, the upstream monitoring well and the downstream monitoring well are completed by adopting an open hole in advance, a technical casing is put on an underground aquifer, and the injection well and the discharge well are completed by adopting casing perforation; and the injection and production well group adopts directional perforation in the underground aquifer in the same depth and opposite directions, and synchronously performs directional fracturing to communicate the interwell stratum and form a fluid channel, and the drilling is finished 30 meters after the drilling penetrates the aquifer, and the underground aquifer is reserved as a sand setting pocket.
The injection wells in the downstream monitoring wells are injection vertical wells, and the injection wells in the injection and production well group are injection directional wells.
The well spacing of any two wells in the upstream monitoring well, the injection-production well group and the downstream monitoring well is more than or equal to 50 m.
The injection directional well is a five-section well, and comprises a straight-increasing-stabilizing-decreasing-straight five-section profile.
The use method of the well pattern system for utilizing the geothermal resources at the middle and deep layers of the residential community uses the well pattern system for utilizing the geothermal resources at the middle and deep layers of the residential community, and the implementation process is as follows:
(1) and exchanging heat of the monitoring well: the discharge wells in the upstream monitoring well and the downstream monitoring well discharge heat-containing underground water in the underground aquifer through drainage pipelines, heat exchange is carried out at the heat exchange unit, the heat-containing underground water after heat exchange is sent to an external user water system through an external conveying pipeline for users to use, on the other hand, the heat-containing underground water after heat exchange is purified by a purification unit and then is injected into the underground aquifer, the heat exchange of the monitoring wells is realized, and the heat-containing underground water discharged by the upstream monitoring well and the heat-containing underground water after heat exchange are injected into the underground aquifer again for temperature, flow and water quality detection;
(2) and heat exchange of the injection well and the discharge well: the discharge well in the injection and production well group discharges heat-containing underground water in the underground water-bearing layer through a drainage pipeline, the heat exchange is carried out at the heat exchange unit, the heat-containing underground water after the heat exchange is sent to an external user water system through an external conveying pipeline for users to use, on the other hand, the heat-containing underground water after the heat exchange is purified by a purification unit and then is injected into the underground water-bearing layer, and a tracer is added during the injection, so that the heat exchange of the injection and discharge wells is realized;
(3) and judging whether the wave coverage of the underground water containing heat of the injection well and the drainage well is controlled or not according to the flow direction of the tracer, and taking corresponding measures.
The specific process of judging whether the wave coverage of the hot underground water injected into and discharged from the well is controlled according to the flow direction of the tracer is as follows: when the drainage pipeline of the drainage well of the upstream monitoring well or the downstream monitoring well detects that the tracer exists, the underground water spread range of the injection and drainage wells is enlarged, at the moment, the drainage quantity of the drainage well in the injection and production well group is increased, the injection water quantity of the injection well in the injection and production 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 spread range of the injection and drainage wells is controlled; when the drainage pipeline of the drainage well of the upstream monitoring well or the downstream monitoring well still detects that the tracer exists, the control is unfavorable, and in order to prevent groundwater from being polluted, the drainage well of the upstream monitoring well is adjusted to be changed into an injection well from the drainage well, and the injection well and the drainage well of the downstream monitoring well are exchanged in position.
The invention has the technical effects that:
1. the well pattern and the well type structure are simple, the construction process is mature, and the cost is low;
2. the implementation of the invention recycles and monitors the underground water used by the injection and mining area, thereby effectively protecting underground water resources.
Drawings
FIG. 1 is a schematic diagram of a well pattern for utilizing geothermal resources in a deep layer in a residential district according to the present invention.
Fig. 2 is a heat exchange well group and a geothermal heat utilization flow chart of a well pattern for utilizing geothermal resources in a middle and deep layer of a residential district.
Wherein, 1 is a drainage pipeline; 2 is a heat exchanger unit; 3 is a purifying unit; 4 is an injection line; 5, supplementing water source; 6 is a tracer; 7 is an output pipeline, 8-an external user water system; the A well is an injection directional well (comprising 2-1A, 2-2A and 2-3A); b is an injection-production discharge well (comprising 2-1B, 2-2B and 2-3B); 1-1 is an upstream monitoring well; the C well is a downstream monitoring well (comprising 3-1C and 3-2C).
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, the well pattern system for utilizing geothermal resources in the middle and deep layers of the residential community comprises an upstream monitoring well 1-1, an injection and production well group and a downstream monitoring well C which are sequentially arranged along the flow direction of underground water; wherein, the upstream monitoring well 1-1 is a discharge well and is positioned at the upstream of the flow direction of the underground water; the downstream monitoring well C comprises 2 wells, wherein 1 well is an injection well, and 1 well is a discharge well and is positioned at the downstream of the flow direction of the underground water; the injection-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-production discharge wells B which are in one-to-one correspondence; wherein the discharge wells are all vertical wells; the injection directional well A is a five-section well preparation and comprises a straight-increasing-stabilizing-decreasing-straight five-section profile. The well spacing of any two wells in the upstream monitoring well 1-1, the injection-production well group and the downstream monitoring well C is more than or equal to 50 m. The system also comprises a heat exchange unit 2 and a purification unit 3; the drainage well is connected with a heat exchanger unit 2, one end of the heat exchanger unit 2 is connected with an injection well through a connecting and purifying unit 3, and the other end of the heat exchanger unit 2 is directly connected with an external user water system 8.
Wherein, the upstream monitoring well 1-1 and the downstream monitoring well C are completed by adopting an open hole in advance, a technical casing is put on an underground aquifer, and an injection well and a discharge well are completed by adopting casing perforation; and the injection and production well group adopts directional perforation in the underground aquifer in the same depth and opposite directions, and synchronously performs directional fracturing to communicate the interwell stratum and form a fluid channel, and the drilling is finished 30 meters after the drilling penetrates the aquifer, and the underground aquifer is reserved as a sand setting pocket. And 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 direction of groundwater flow. The upstream monitoring well 1-1 is a discharge well, the distance between the upstream monitoring well and the injection directional well number well is 2-1A and is 50 meters, a hydraulic funnel is formed at the upstream of underground water, and the discharged water quality change is monitored in real time.
The distance between the 3-1C downstream monitoring well and the 2-2B injection-production discharge 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 downstream of underground water, and the discharged water quality change is monitored in real time. The 3-2C downstream monitoring well is an injection well and injects the underground water which is discharged from the upstream monitoring well 1-1 and is subjected to heat exchange.
The 2-1A injection directional well, the 2-2A injection directional well and the 2-3A injection directional well correspond to the 2-1B injection-production discharge well, the 2-2B injection-production discharge well and the 2-3B injection-production discharge well one by one, the inter-well distance is 50 meters, injection-production well groups are formed, and the injection-production well groups are drilled 30 meters after drilling through the aquifer and are reserved as sand setting pockets. The injection and production well group adopts the directional perforation in the opposite direction with the same depth in the water-containing layer section and synchronously performs directional fracturing to communicate the stratum between wells and form a fluid channel.
The 2-2A injection directional well is added with the tracer 6 while injecting fluid, and the tracer 6 can be a chemical, isotopic, fluorescent or magnetic substance, so that the selected tracer 6 is ensured to have no pollution to the underground water body.
The use method of the well pattern system for utilizing the geothermal resources at the middle and deep layers of the residential community uses the well pattern system for utilizing the geothermal resources at the middle and deep layers of the residential community, and the implementation process is as follows:
(1) and exchanging heat of the monitoring well: the method comprises the following steps that hot underground water in an underground water-bearing layer is discharged from an upstream monitoring well 1-1 and a downstream monitoring well 3-1C through a drainage pipeline 1, heat exchange is carried out at a heat exchange unit 2, the hot underground water after heat exchange is sent to an external user water system 8 through an external conveying pipeline 7 for users to use, on the other hand, the hot underground water after heat exchange is purified by a purifying unit 3 and then is injected into the underground water-bearing layer through an injection pipeline 4, heat exchange of the monitoring wells is realized, and the hot underground water discharged from the upstream monitoring well 1-1 and the underground water-bearing layer are injected again for temperature, flow and water quality detection;
(2) and heat exchange of the injection well and the discharge well: the injection and production discharge well B discharges hot underground water in an underground aquifer through a drainage pipeline 1, the hot underground water is subjected to heat exchange at a heat exchange unit 2, the hot underground water subjected to heat exchange is conveyed to an external user water system 8 through an external conveying pipeline 7 for users to use, on the other hand, the hot underground water subjected to heat exchange is purified by a purification unit 3 and then is injected into the underground aquifer through an injection pipeline 4, a tracer 6 is added during injection for monitoring the injection and production wave and range of underground water, and the injection water quantity of the injection directional well A is supplemented through a supplementing water source 5 according to the water quantity; and the heat exchange of the injection well and the discharge well is realized.
(3) And judging whether the wave coverage of the hot underground water of the injection well and the drainage well is controlled or not according to the flow direction of the tracer 6, and taking corresponding measures.
The specific process of judging whether the wave coverage of the hot underground water injected and drained into the well is controlled according to the flow direction of the tracer 6 comprises the following steps: when the drainage pipeline 1 of the upstream monitoring well 1-1 or the downstream monitoring well 3-1C detects that the tracer 6 exists, the underground water sweep range of the injection and drainage well is enlarged, the drainage quantity of the injection and production drainage well B is increased, the injection water quantity of the injection and production directional well A in the injection and production well group is correspondingly reduced, and when the drainage pipeline 1 of the upstream monitoring well 1-1 or the downstream monitoring well 3-1C detects that the tracer 6 does not exist, the underground water sweep range of the injection and drainage well is controlled; when the drainage pipeline 1 of the upstream monitoring well 1-1 or the 3-1C downstream monitoring well still detects that the tracer 6 exists, the control is unfavorable, in order to prevent the groundwater from being polluted, the upstream monitoring well 1-1 is adjusted to be an injection well from a discharge well, or the injection well and the discharge well of the downstream monitoring well C are exchanged in position, namely the 3-1C downstream monitoring well is adjusted to be an injection well, and the 3-2C downstream monitoring well is adjusted to be a discharge well.

Claims (6)

1. A well pattern system for utilizing geothermal resources in the middle and deep layers of a residential community is characterized in that: the system comprises an upstream monitoring well (1-1), an injection and production well group and a downstream monitoring well (C) which are sequentially arranged along the flow direction of underground water; wherein,
the upstream monitoring well (1-1) is a discharge well and is positioned at the upstream of the flow direction of the underground water;
the downstream monitoring well (C) comprises 2 wells, wherein 1 well is an injection well, and 1 well is a discharge well and is positioned at the downstream of the flow direction of the underground water;
the injection and production well group is positioned between the upstream monitoring well (1-1) and the downstream monitoring well (C), and comprises n groups of injection wells and injection and production discharge wells (B) 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 vertical wells;
the device also comprises a heat exchange unit (2) and a purification unit (3); the discharge well is connected with a heat exchanger unit (2), one end of the heat exchanger unit (2) is connected with the injection well through a connecting and purifying unit (3), and the other end of the heat exchanger unit (2) is directly connected with an external user water system (8);
wherein, the upstream monitoring well (1-1) and the downstream monitoring well (C) adopt the prior open hole completion, the technical casing is set on the underground aquifer, and the injection well and the discharge well adopt the casing perforation completion; and the injection and production well group adopts directional perforation in the underground aquifer in the same depth and opposite directions, and synchronously performs directional fracturing to communicate the interwell stratum and form a fluid channel, and the drilling is finished 30 meters after the drilling penetrates the aquifer, and the underground aquifer is reserved as a sand setting pocket.
2. The well pattern system for utilizing geothermal resources at a deep level in a residential community as claimed in claim 1, wherein: and the injection well in the downstream monitoring well (C) is an injection vertical well, and the injection well in the injection and production well group is an injection directional well (A).
3. The well pattern system for utilizing geothermal resources at a deep level in a residential community as claimed in claim 2, 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 50 m.
4. The well pattern system for utilizing geothermal resources at a deep level in a residential community as set forth in claim 3, wherein: the injection directional well (A) is a five-section well control and comprises a straight-increasing-stabilizing-decreasing-straight five-section profile.
5. A use method of a well pattern system for utilizing deep geothermal resources in a residential community is characterized by comprising the following steps: using the well pattern system for geothermal resource utilization in the deep layer of a residential community as claimed in claim 4, the following is achieved:
(1) and exchanging heat of the monitoring well: the discharge wells in the upstream monitoring well (1-1) and the downstream monitoring well (C) discharge heat-containing underground water in an underground aquifer through a drainage pipeline (1), heat exchange is carried out at a heat exchange unit (2), the heat-containing underground water after heat exchange is sent to an external user water system (8) through an external pipeline (7) for users to use, on the other hand, the heat-containing underground water after heat exchange is purified by a purification unit (3) and then is injected into the underground aquifer, the heat exchange of the monitoring wells is realized, and the heat-containing underground water discharged by the upstream monitoring well (1-1) and the heat-containing underground water after being injected into the underground aquifer again are subjected to temperature, flow and water quality detection;
(2) and heat exchange of the injection well and the discharge well: discharging hot underground water in an underground water-bearing layer through a drainage pipeline (1) by a discharge well in the injection and production well group, exchanging heat at a heat exchange unit (2), sending the hot underground water after heat exchange to an external user water system (8) through an external conveying pipeline (7) for users to use, purifying the hot underground water after heat exchange by a purification unit (3) and then injecting the purified underground water into the underground water-bearing layer, and adding a tracer (6) during injection to realize heat exchange of the injection and discharge wells;
(3) and judging whether the wave coverage of the hot underground water of the injection well and the drainage well is controlled or not according to the flow direction of the tracer (6), and taking corresponding measures.
6. The method of using a deep geothermal resource utilization well pattern system in a residential community as claimed in claim 1, wherein: the specific process of judging whether the wave coverage of the hot underground water of the injection well and the drainage well is 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 downstream monitoring well (C) detects that the tracer (6) exists, the underground water spread range of the injection and drainage wells is enlarged, the drainage quantity of the drainage well in the injection and production well group is increased, the injection water quantity of the injection well in the injection and production well group is correspondingly reduced, and when the drainage pipeline (1) of the drainage well of the downstream monitoring well (C) detects that the tracer (6) does not exist, the underground water spread range of the injection and drainage wells is controlled; when the drainage pipeline (1) of the drainage well of the upstream monitoring well (1-1) or 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 drainage pipeline is adjusted to change the drainage well of the upstream monitoring well (1-1) from the drainage well to the injection well so as to exchange the positions of the injection well and the drainage well of the downstream monitoring well (C).
CN201810266851.9A 2018-03-28 2018-03-28 Deep geothermal resource utilization well pattern system in residential district and use method thereof Active CN108266175B (en)

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